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Note: This page contains sample records for the topic "3-dimensional converted shear" from the National Library of EnergyBeta (NLEBeta).
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1

3-Dimensional Imaging At Nanometer Resolutions  

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

Information Technology & Communications 3-Dimensional Imaging At Nanometer Resolutions 3-Dimensional Imaging At Nanometer Resolutions An apparatus and method for enabling...

2

3-Dimensional Imaging At Nanometer Resolutions  

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

3-Dimensional Imaging At Nanometer Resolutions 3-Dimensional Imaging At Nanometer Resolutions 3-Dimensional Imaging At Nanometer Resolutions An apparatus and method for enabling precise, 3-dimensional, photoactivation localization microscopy (PALM). Available for thumbnail of Feynman Center (505) 665-9090 Email 3-Dimensional Imaging At Nanometer Resolutions An apparatus and method for enabling precise, 3-dimensional, photoactivation localization microscopy (PALM) using selective, two-photon activation of fluorophores in a single z-slice of a sample in cooperation with time-gated imaging for reducing the background radiation from other image planes to levels suitable for single-molecule detection and spatial location, are described. U.S. Patent No.: 7,675,045 (DOE S-112,966) Patent Application Filing Date: October 9, 2008

3

3-dimensional imaging at nanometer resolutions  

DOE Patents (OSTI)

An apparatus and method for enabling precise, 3-dimensional, photoactivation localization microscopy (PALM) using selective, two-photon activation of fluorophores in a single z-slice of a sample in cooperation with time-gated imaging for reducing the background radiation from other image planes to levels suitable for single-molecule detection and spatial location, are described.

Werner, James H. (Los Alamos, NM); Goodwin, Peter M. (Los Alamos, NM); Shreve, Andrew P. (Santa Fe, NM)

2010-03-09T23:59:59.000Z

4

Light field applications to 3-dimensional surface imaging  

E-Print Network (OSTI)

The structure of light around a scene may be contained in a 4-dimensional array known as a light field. This thesis describes methods for acquiring and manipulating light fields for applications in 3-dimensional imaging. ...

Hong, Wenxian

2009-01-01T23:59:59.000Z

5

The Kurtosis of the Cosmic Shear Field  

E-Print Network (OSTI)

We study the fourth-order moment of the cosmic shear field using the dark matter halo approach to describe the nonlinear gravitational evolution of structure in the universe. Since the third-order moment of the shear field vanishes because of symmetry, non-Gaussian signatures in its one-point statistics emerge at the fourth-order level. We argue that the shear kurtosis parameter S_4 = /^3 may be more directly applicable to realistic data than the well-studied higher-order statistics of the convergence field, since obtaining the convergence requires a non-local reconstruction from the measured shear field. We compare our halo model predictions for the variance, skewness and kurtosis of lensing fields with ray-tracing simulations of cold dark matter models and find good agreement. The shear kurtosis calculation is made tractable by developing approximations for fast and accurate evaluations of the 8-dimensional integrals needed to obtain the kurtosis. We show that on small scales it is dominated by correlations within halos more massive than 10^14 solar masses. The shear kurtosis is sensitive to the mass density parameter of the universe, Omega, and has relatively weak dependences on other parameters. The approximations we develop for the third- and fourth-order moments allow for accurate halo model predictions for the 3-dimensional mass distribution as well. We demonstrate their accuracy in the small scale regime, below 2 Mpc, where analytical approaches used in the literature so far cease to be accurate.

Masahiro Takada; Bhuvnesh Jain

2002-05-05T23:59:59.000Z

6

3-dimensional imaging system using crystal diffraction lenses  

DOE Patents (OSTI)

A device for imaging a plurality of sources of x-ray and gamma-ray radiation is provided. Diffracting crystals are used for focussing the radiation and directing the radiation to a detector which is used for analyzing their addition to collect data as to the location of the source of radiation. A computer is used for converting the data to an image. The invention also provides for a method for imaging x-ray and gamma radiation by supplying a plurality of sources of radiation; focussing the radiation onto a detector; analyzing the focused radiation to collect data as to the type and location of the radiation; and producing an image using the data.

Smither, Robert K. (Hinsdale, IL)

1999-01-01T23:59:59.000Z

7

Interleaved power converter  

DOE Patents (OSTI)

A power converter architecture interleaves full bridge converters to alleviate thermal management problems in high current applications, and may, for example, double the output power capability while reducing parts count and costs. For example, one phase of a three phase inverter is shared between two transformers, which provide power to a rectifier such as a current doubler rectifier to provide two full bridge DC/DC converters with three rather than four high voltage inverter legs.

Zhu, Lizhi (Canton, MI)

2007-11-13T23:59:59.000Z

8

Universal thermochemical energy converter  

DOE Patents (OSTI)

Disclosed are methods and apparatus for a thermochemical closed cycle employing a polyatomic, chemically active working fluid for converting heat energy into useful work.

Labinov, Solomon Davidovich (Oak Ridge, TN); Sand, James R. (Oak Ridge, TN); Conklin, James C. (Knoxville, TN); VanCoevering, James (Oak Ridge, TN); Courville, George E. (Oak Ridge, TN)

2001-01-01T23:59:59.000Z

9

Microminiature thermionic converters  

DOE Patents (OSTI)

Microminiature thermionic converts (MTCs) having high energy-conversion efficiencies and variable operating temperatures. Methods of manufacturing those converters using semiconductor integrated circuit fabrication and micromachine manufacturing techniques are also disclosed. The MTCs of the invention incorporate cathode to anode spacing of about 1 micron or less and use cathode and anode materials having work functions ranging from about 1 eV to about 3 eV. Existing prior art thermionic converter technology has energy conversion efficiencies ranging from 5-15%. The MTCs of the present invention have maximum efficiencies of just under 30%, and thousands of the devices can be fabricated at modest costs.

King, Donald B. (Albuquerque, NM); Sadwick, Laurence P. (Salt Lake City, UT); Wernsman, Bernard R. (Clairton, PA)

2001-09-25T23:59:59.000Z

10

Digital scale converter  

DOE Patents (OSTI)

A digital scale converter is provided for binary coded decimal (BCD) conversion. The converter may be programmed to convert a BCD value of a first scale to the equivalent value of a second scale according to a known ratio. The value to be converted is loaded into a first BCD counter and counted down to zero while a second BCD counter registers counts from zero or an offset value depending upon the conversion. Programmable rate multipliers are used to generate pulses at selected rates to the counters for the proper conversion ratio. The value present in the second counter at the time the first counter is counted to the zero count is the equivalent value of the second scale. This value may be read out and displayed on a conventional seven-segment digital display.

Upton, Richard G. (Oak Ridge, TN)

1978-01-01T23:59:59.000Z

11

STR_ConvertFormats  

Science Conference Proceedings (OSTI)

... 16. 17, True, AlngDat, dd-mmm-yy, ! Convert ... 18. 19, True, AlngDatTim, dd-mmm-yy hh:mm:ss, True, True, True, True, True, True, ! Display ...

2012-03-06T23:59:59.000Z

12

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O (input/output) channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardward for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold.

Moore, James M. (Livermore, CA); Leighton, James F. (Livermore, CA)

1990-01-01T23:59:59.000Z

13

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardware for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold. 7 figs.

Moore, J.M.; Leighton, J.F.

1988-02-05T23:59:59.000Z

14

Thermionic energy converters  

DOE Patents (OSTI)

A thermionic device for converting nuclear energy into electrical energy comprising a tubular anode spaced from and surrounding a cylindrical cathode, the cathode having an outer emitting surface of ruthenium, and nuclear fuel on the inner cylindrical surface. The nuclear fuel is a ceramic composition of fissionable material in a metal matrix. An axial void is provided to collect and contain fission product gases.

Monroe, Jr., James E. (Timonium, MD)

1977-08-09T23:59:59.000Z

15

Liquid metal thermal electric converter  

DOE Patents (OSTI)

A liquid metal thermal electric converter which converts heat energy to electrical energy. The design of the liquid metal thermal electric converter incorporates a unique configuration which directs the metal fluid pressure to the outside of the tube which results in the structural loads in the tube to be compressive. A liquid metal thermal electric converter refluxing boiler with series connection of tubes and a multiple cell liquid metal thermal electric converter are also provided.

Abbin, Joseph P. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Lukens, Laurance L. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

16

On the Relationship between the Rozansky-Witten and the 3-Dimensional Seiberg-Witten Invariants  

E-Print Network (OSTI)

The Seiberg-Witten analysis of the low-energy effective action of d=4 N=2 SYM theories reveals the relation between the Donaldson and Seiberg-Witten (SW) monopole invariants. Here we apply analogous reasoning to d=3 N=4 theories and propose a general relationship between Rozansky-Witten (RW) and 3-dimensional Abelian monopole invariants. In particular, we deduce the equality of the SU(2) Casson invariant and the 3-dimensional SW invariant (this includes a special case of the Meng-Taubes theorem relating the SW invariant to Milnor torsion). Since there are only a finite number of basic RW invariants of a given degree, many different topological field theories can be used to represent essentially the same topological invariant. This leads us to advocate using higher rank Abelian gauge theories to shed light on the higher (non-Abelian) RW invariants and we write down candidate higher rank SW equations.

Matthias Blau; George Thompson

2000-06-30T23:59:59.000Z

17

Modons in Shear Flow  

Science Conference Proceedings (OSTI)

Modons in shear flow are computed as equilibrium solutions of the equivalent barotropic vorticity equation using a numerical Newton–Kantorovich iterative technique with double Fourier spectral expansion. The model is given a first guess of an ...

Sue Ellen Haupt; James C. McWilliams; Joseph J. Tribbia

1993-05-01T23:59:59.000Z

18

Cycloidal Wave Energy Converter  

SciTech Connect

This program allowed further advancing the development of a novel type of wave energy converter, a Cycloidal Wave Energy Converter or CycWEC. A CycWEC consists of one or more hydrofoils rotating around a central shaft, and operates fully submerged beneath the water surface. It operates under feedback control sensing the incoming waves, and converts wave power to shaft power directly without any intermediate power take off system. Previous research consisting of numerical simulations and two dimensional small 1:300 scale wave flume experiments had indicated wave cancellation efficiencies beyond 95%. The present work was centered on construction and testing of a 1:10 scale model and conducting two testing campaigns in a three dimensional wave basin. These experiments allowed for the first time for direct measurement of electrical power generated as well as the interaction of the CycWEC in a three dimensional environment. The Atargis team successfully conducted two testing campaigns at the Texas A&M Offshore Technology Research Center and was able to demonstrate electricity generation. In addition, three dimensional wave diffraction results show the ability to achieve wave focusing, thus increasing the amount of wave power that can be extracted beyond what was expected from earlier two dimensional investigations. Numerical results showed wave cancellation efficiencies for irregular waves to be on par with results for regular waves over a wide range of wave lengths. Using the results from previous simulations and experiments a full scale prototype was designed and its performance in a North Atlantic wave climate of average 30kW/m of wave crest was estimated. A full scale WEC with a blade span of 150m will deliver a design power of 5MW at an estimated levelized cost of energy (LCOE) in the range of 10-17 US cents per kWh. Based on the new results achieved in the 1:10 scale experiments these estimates appear conservative and the likely performance at full scale will exceed this initial performance estimates. In advancing the Technology Readiness Level (TRL) of this type of wave energy converter from 3 to 4, we find the CycWEC to exceed our initial estimates in terms of hydrodynamic performance. Once fully developed and optimized, it has the potential to not just outperform all other WEC technologies, but to also deliver power at a lower LCOE than competing conventional renewables like wind and solar. Given the large wave power resource both domestically and internationally, this technology has the potential to lead to a large improvement in our ability to produce clean electricity at affordable cost.

Stefan G. Siegel, Ph.D.

2012-11-30T23:59:59.000Z

19

DC systems with transformerless converters  

Science Conference Proceedings (OSTI)

A technical and economic feasibility study of HVDC systems without converter transformers is presented. The presentation includes proposed solutions to the drawback related to the absence of galvanic separation between the ac and dc systems, if the converter transformers are eliminated. The results show that HVDC systems without converter transformers are both technically and economically feasible. The cost savings can be substantial.

Vithayathil, J.J.; Mittlestadt, W. [Bonneville Power Administration, Portland, OR (United States); Bjoerklund, P.E. [ABB Power Systems AB, Ludvika (Sweden)

1995-07-01T23:59:59.000Z

20

Ultrasonic shear wave couplant  

DOE Patents (OSTI)

Ultrasonically testing of an article at high temperatures is accomplished by the use of a compact layer of a dry ceramic powder as a couplant in a method which involves providing an ultrasonic transducer as a probe capable of transmitting shear waves, coupling the probe to the article through a thin compact layer of a dry ceramic powder, propagating a shear wave from the probe through the ceramic powder and into the article to develop echo signals, and analyzing the echo signals to determine at least one physical characteristic of the article.

Kupperman, David S. (Oak Park, IL); Lanham, Ronald N. (Lockport, IL)

1985-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Ultrasonic shear wave couplant  

DOE Patents (OSTI)

Ultrasonically testing of an article at high temperatures is accomplished by the use of a compact layer of a dry ceramic powder as a couplant in a method which involves providing an ultrasonic transducer as a probe capable of transmitting shear waves, coupling the probe to the article through a thin compact layer of a dry ceramic powder, propagating a shear wave from the probe through the ceramic powder and into the article to develop echo signals, and analyzing the echo signals to determine at least one physical characteristic of the article.

Kupperman, D.S.; Lanham, R.N.

1984-04-11T23:59:59.000Z

22

MT3D: a 3 dimensional magnetotelluric modeling program (user's guide and documentation for Rev. 1)  

DOE Green Energy (OSTI)

MT3D.REV1 is a non-interactive computer program written in FORTRAN to do 3-dimensional magnetotelluric modeling. A 3-D volume integral equation has been adapted to simulate the MT response of a 3D body in the earth. An integro-difference scheme has been incorporated to increase the accuracy. This is a user's guide for MT3D.REV1 on the University of Utah Research Institute's (UURI) PRIME 400 computer operating under PRIMOS IV, Rev. 17.

Nutter, C.; Wannamaker, P.E.

1980-11-01T23:59:59.000Z

23

Bidirectional buck boost converter  

DOE Patents (OSTI)

A bidirectional buck boost converter and method of operating the same allows regulation of power flow between first and second voltage sources in which the voltage level at each source is subject to change and power flow is independent of relative voltage levels. In one embodiment, the converter is designed for hard switching while another embodiment implements soft switching of the switching devices. In both embodiments, first and second switching devices are serially coupled between a relatively positive terminal and a relatively negative terminal of a first voltage source with third and fourth switching devices serially coupled between a relatively positive terminal and a relatively negative terminal of a second voltage source. A free-wheeling diode is coupled, respectively, in parallel opposition with respective ones of the switching devices. An inductor is coupled between a junction of the first and second switching devices and a junction of the third and fourth switching devices. Gating pulses supplied by a gating circuit selectively enable operation of the switching devices for transferring power between the voltage sources. In the second embodiment, each switching device is shunted by a capacitor and the switching devices are operated when voltage across the device is substantially zero. 20 figs.

Esser, A.A.M.

1998-03-31T23:59:59.000Z

24

Advanced converter reactors  

SciTech Connect

Advanced converter reactors (ACRs) of primary US interest are those which can be commercialized within about 20 years, and are: Advanced Light-Water Reactors, Spectral-Shift-Control Reactors, Heavy-Water Reactors (CANDU type), and High-Temperature Gas-Cooled Reactors. These reactors can operate on uranium, thorium, or uranium-thorium fuel cycles, but have the greatest fuel utilization on thorium type cycles. The water reactors tend to operate more economically on uranium cycles, while the HTGR is more economical on thorium cycles. Thus, the HTGR had the greatest practical potential for improving fuel utilization. If the US has 3.4 to 4 million tons U/sub 3/O/sub 8/ at reasonable costs, ACRs can make important contributions to maintaining a high nuclear power level for many decades; further, they work well with fast breeder reactors in the long term under symbiotic fueling conditions. Primary nuclear data needs of ACRs are integral measurements of reactivity coefficients and resonance absorption integrals.

Kasten, P.R.

1979-01-01T23:59:59.000Z

25

Greenhouse Gases Converted to Fuel  

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

Greenhouse Greenhouse Gases Converted to Fuel Greenhouse Gases Converted to Fuel carbon-conversion-fig-1.jpg Key Challenges: An important strategy for reducing global CO2 emissions calls for capturing the greenhouse gas and converting it to fuels and chemicals. Although researchers working toward that goal demonstrated in 1992 such a reaction in the lab, a key outstanding scientific challenge was explaining the details of how the reaction took place - its "mechanism." Why it Matters: An important potential strategy for reducing global CO2 emissions calls for capturing the greenhouse gas and converting it electrochemically to fuels and chemicals. Accomplishments: Computation to explain how carbon dioxide can be converted to small organic molecules with little energy input. The

26

Shear viscosity of nuclear matter  

E-Print Network (OSTI)

In this talk I report my recent study on the shear viscosity of neutron-rich nuclear matter from a relaxation time approach. An isospin- and momentum-dependent interaction is used in the study. Effects of density, temperature, and isospin asymmetry of nuclear matter on its shear viscosity have been discussed. Similar to the symmetry energy, the symmetry shear viscosity is defined and its density and temperature dependence are studied.

Jun Xu

2013-02-01T23:59:59.000Z

27

Shear viscosity of nuclear matter  

E-Print Network (OSTI)

In this talk I report my recent study on the shear viscosity of neutron-rich nuclear matter from a relaxation time approach. An isospin- and momentum-dependent interaction is used in the study. Effects of density, temperature, and isospin asymmetry of nuclear matter on its shear viscosity have been discussed. Similar to the symmetry energy, the symmetry shear viscosity is defined and its density and temperature dependence are studied.

Xu, Jun

2013-01-01T23:59:59.000Z

28

Helicity and Thermal Convection with Shear  

Science Conference Proceedings (OSTI)

The relations between nonlinear energy transport and helicity of the flow are studied through simulations of thermal convection with mean shear. Parallel-plate convection with a rotating mean shear, a linear undirectional shear, a parabolic ...

Wan-Shu Wu; Douglas K. Lilly; Robert M. Kerr

1992-10-01T23:59:59.000Z

29

Array Converter | Open Energy Information  

Open Energy Info (EERE)

Converter Converter Jump to: navigation, search Name Array Converter Place Sunnyvale, California Zip 94086 Product US manufacturer of micro-inverters. Coordinates 32.780338°, -96.547405° 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":32.780338,"lon":-96.547405,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

30

Multilevel converters for power system applications  

SciTech Connect

Multilevel converters are emerging as a new breed of power converter options for power system applications. These converters are most suitable for high voltage high power applications because they connect devices in series without the need for component matching. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. To avoid voltage unbalance between different levels, several techniques have been proposed for different applications. Excluding magnetic-coupled converters, this paper introduces three multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded inverters with separate dc sources. The operation principle, features, constraints, and potential applications of these converters will be discussed.

Lai, J.S.; Stovall, J.P. [Oak Ridge National Lab., TN (United States); Peng, F.Z. [Univ. of Tennessee, Knoxville, TN (United States)]|[Oak Ridge National Lab., TN (United States)

1995-09-01T23:59:59.000Z

31

Shear shocks in fragile networks  

E-Print Network (OSTI)

A minimal model for studying the mechanical properties of amorphous solids is a disordered network of point masses connected by unbreakable springs. At a critical value of its mean connectivity, such a network becomes fragile: it undergoes a rigidity transition signaled by a vanishing shear modulus and transverse sound speed. We investigate analytically and numerically the linear and non-linear visco-elastic response of these fragile solids by probing how shear fronts propagate through them. Our approach, that we tentatively label shear front rheology, provides an alternative route to standard oscillatory rheology. In the linear regime, we observe at late times a diffusive broadening of the fronts controlled by an effective shear viscosity that diverges at the critical point. No matter how small the microscopic coefficient of dissipation, strongly disordered networks behave as if they were over-damped because energy is irreversibly leaked into diverging non-affine fluctuations. Close to the transition, the regime of linear response becomes vanishingly small: the tiniest shear strains generate strongly non-linear shear shock waves qualitatively different from their compressional counterparts in granular media. The inherent non-linearities trigger an energy cascade from low to high frequency components that keep the network away from attaining the quasi-static limit. This mechanism, reminiscent of acoustic turbulence, causes a super-diffusive broadening of the shock width.

Stephan Ulrich; Nitin Upadhyaya; Bas van Opheusden; Vincenzo Vitelli

2013-07-29T23:59:59.000Z

32

Portable convertible blast effects shield  

DOE Patents (OSTI)

A rapidly deployable portable convertible blast effects shield/ballistic shield includes a set two or more telescoping cylindrical rings operably connected to each other to convert between a telescopically-collapsed configuration for storage and transport, and a telescopically-extended upright configuration forming an expanded inner volume. In a first embodiment, the upright configuration provides blast effects shielding, such as against blast pressures, shrapnel, and/or fire balls. And in a second embodiment, the upright configuration provides ballistic shielding, such as against incoming weapons fire, shrapnel, etc. Each ring has a high-strength material construction, such as a composite fiber and matrix material, capable of substantially inhibiting blast effects and impinging projectiles from passing through the shield. And the set of rings are releasably securable to each other in the telescopically-extended upright configuration, such as by click locks.

Pastrnak, John W. (Livermore, CA); Hollaway, Rocky (Modesto, CA); Henning, Carl D. (Livermore, CA); Deteresa, Steve (Livermore, CA); Grundler, Walter (Hayward, CA); Hagler, Lisle B. (Berkeley, CA); Kokko, Edwin (Dublin, CA); Switzer, Vernon A (Livermore, CA)

2007-05-22T23:59:59.000Z

33

Portable convertible blast effects shield  

DOE Patents (OSTI)

A rapidly deployable portable convertible blast effects shield/ballistic shield includes a set two or more telescoping cylindrical rings operably connected to each other to convert between a telescopically-collapsed configuration for storage and transport, and a telescopically-extended upright configuration forming an expanded inner volume. In a first embodiment, the upright configuration provides blast effects shielding, such as against blast pressures, shrapnel, and/or fire balls. And in a second embodiment, the upright configuration provides ballistic shielding, such as against incoming weapons fire, shrapnel, etc. Each ring has a high-strength material construction, such as a composite fiber and matrix material, capable of substantially inhibiting blast effects and impinging projectiles from passing through the shield. And the set of rings are releasably securable to each other in the telescopically-extended upright configuration, such as by click locks.

Pastrnak, John W. (Livermore, CA); Hollaway, Rocky (Modesto, CA); Henning, Carl D. (Livermore, CA); Deteresa, Steve (Livermore, CA); Grundler, Walter (Hayward, CA); Hagler,; Lisle B. (Berkeley, CA); Kokko, Edwin (Dublin, CA); Switzer, Vernon A (Livermore, CA)

2010-10-26T23:59:59.000Z

34

Portable convertible blast effects shield  

DOE Patents (OSTI)

A rapidly deployable portable convertible blast effects shield/ballistic shield includes a set two or more frusto-conically-tapered telescoping rings operably connected to each other to convert between a telescopically-collapsed configuration for storage and transport, and a telescopically-extended upright configuration forming an expanded inner volume. In a first embodiment, the upright configuration provides blast effects shielding, such as against blast pressures, shrapnel, and/or fire balls. And in a second embodiment, the upright configuration provides ballistic shielding, such as against incoming weapons fire, shrapnel, etc. Each ring has a high-strength material construction, such as a composite fiber and matrix material, capable of substantially inhibiting blast effects and impinging projectiles from passing through the shield. And the set of rings are releasably securable to each other in the telescopically-extended upright configuration by the friction fit of adjacent pairs of frusto-conically-tapered rings to each other.

Pastrnak, John W. (Livermore, CA); Hollaway, Rocky (Modesto, CA); Henning, Carl D. (Livermore, CA); Deteresa, Steve (Livermore, CA); Grundler, Walter (Hayward, CA); Hagler, Lisle B. (Berkeley, CA); Kokko, Edwin (Dublin, CA); Switzer, Vernon A. (Livermore, CA)

2011-03-15T23:59:59.000Z

35

Converting Petroleum Coke to Electricity  

E-Print Network (OSTI)

Changes in oil refining technology and economics are driving refiners to utilize thermal processes to maximize the conversion of heavy crude oil components to clean products. Since the primary unit operation to accomplish this objective is the coking unit, more cokers are being built, and existing cokers are being operated to maximum capacity utilization. SRI recently completed an assignment for a refiner interested in converting the by-product fluid coke from his unit to electricity. This paper presents the operating history of US based plants converting petroleum coke to electricity, and presents generic economics for the conversion process utilizing three primary technologies available: conventional pulverized coke combustion, atmospheric fluidized bed combustion, and coke gasification combined cycle power production.

Pavone, A.

1992-04-01T23:59:59.000Z

36

Auxiliary resonant DC tank converter  

SciTech Connect

An auxiliary resonant dc tank (ARDCT) converter is provided for achieving soft-switching in a power converter. An ARDCT circuit is coupled directly across a dc bus to the inverter to generate a resonant dc bus voltage, including upper and lower resonant capacitors connected in series as a resonant leg, first and second dc tank capacitors connected in series as a tank leg, and an auxiliary resonant circuit comprising a series combination of a resonant inductor and a pair of auxiliary switching devices. The ARDCT circuit further includes first clamping means for holding the resonant dc bus voltage to the dc tank voltage of the tank leg, and second clamping means for clamping the resonant dc bus voltage to zero during a resonant period. The ARDCT circuit resonantly brings the dc bus voltage to zero in order to provide a zero-voltage switching opportunity for the inverter, then quickly rebounds the dc bus voltage back to the dc tank voltage after the inverter changes state. The auxiliary switching devices are turned on and off under zero-current conditions. The ARDCT circuit only absorbs ripples of the inverter dc bus current, thus having less current stress. In addition, since the ARDCT circuit is coupled in parallel with the dc power supply and the inverter for merely assisting soft-switching of the inverter without participating in real dc power transmission and power conversion, malfunction and failure of the tank circuit will not affect the functional operation of the inverter; thus a highly reliable converter system is expected.

Peng, Fang Z. (Knoxville, TN)

2000-01-01T23:59:59.000Z

37

Converting Energy to Medical Progress  

Office of Scientific and Technical Information (OSTI)

Converting Converting to April 2001 An introduction to the unique research funded by the Medical Sciences Division Biological and Environmental Research (BER) Office of Science, U.S. Department of Energy Nuclear Medicine E v e r y w h e r e i n He a l t h c a r e A n d s o do e s B E R N u c l e a r M e d i c i n e H e lps P a t i e n t s the Office of Biological and Environmental Research (BER) of the United States Department of Energy (DOE) has been investing to advance environmental and biomedical knowledge connected to energy. The BER Medical Sciences program fosters research to develop beneficial applications of nuclear technologies for medical diagnosis and treatment of many diseases. Today, nuclear medicine helps millions of patients annually in the United States. Nearly every nuclear medicine scan or test used today was made possible by

38

Converting Energy to Medical Progress  

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

Converting Converting to April 2001 An introduction to the unique research funded by the Medical Sciences Division Biological and Environmental Research (BER) Office of Science, U.S. Department of Energy Nuclear Medicine E v e r y w h e r e i n He a l t h c a r e A n d s o do e s B E R N u c l e a r M e d i c i n e H e lps P a t i e n t s the Office of Biological and Environmental Research (BER) of the United States Department of Energy (DOE) has been investing to advance environmental and biomedical knowledge connected to energy. The BER Medical Sciences program fosters research to develop beneficial applications of nuclear technologies for medical diagnosis and treatment of many diseases. Today, nuclear medicine helps millions of patients annually in the United States. Nearly every nuclear medicine scan or test used today was made possible by

39

Frontal Instability in a Sheared Basic State  

Science Conference Proceedings (OSTI)

A two-layer frontal model is adapted to investigate the stability of fronts in the presence of potential vorticity (PV) anomalies corresponding to cross-front shear of the mean alongfront flow. Introducing shear modifies the unstable baroclinic ...

Douglas M. Sinton; William D. Heise

1993-06-01T23:59:59.000Z

40

Elastic Turbulence in Shear Banding Wormlike Micelles  

E-Print Network (OSTI)

We study the dynamics of the Taylor-Couette flow of shear banding wormlike micelles. We focus on the high shear rate branch of the flow curve and show that for sufficiently high Weissenberg numbers, this branch becomes ...

Fardin, Marc-Antoine

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Kinematics of compressional and extensional ductile shearing...  

Open Energy Info (EERE)

the northeastern basin and range Details Activities (1) Areas (1) Regions (0) Abstract: Analysis of shear criteria enables the kinematics of two main ductile-shearing events (D1...

42

Turbulent Mixing in Stably Stratified Shear Flows  

Science Conference Proceedings (OSTI)

Vertical mixing of momentum and heat is investigated in turbulent stratified shear flows. It is assumed that the flow has uniform shear and stratification with homogeneous turbulence and that an equilibrium is reached between kinetic and ...

U. Schumann; T. Gerz

1995-01-01T23:59:59.000Z

43

Thermionic converter emitter support arrangement  

DOE Green Energy (OSTI)

This document discusses a support provided for use in a thermionic converter to support an end of an emitter to keep it out of contact with a surrounding collector while allowing the emitter end to move axially as its temperature changes. The emitter end is supported by a spring structure that includes a pair of Belleville springs, and the spring structure is supported by a support structure fixed to the housing that includes the collector. The support structure is in the form of a sandwich with a small metal spring-engaging element at the front end, a larger metal main support at the rear end that is attached to the housing, and with a ceramic layer between them that is bonded by hot isostatic pressing to the metal element and metal main support. The spring structure can include a loose wafer captured between the Belleville springs. 7 figs.

Allen, D.T.

1989-07-06T23:59:59.000Z

44

Controlled shear/tension fixture  

DOE Patents (OSTI)

A test fixture for simultaneously testing two material test samples is provided. The fixture provides substantially equal shear and tensile stresses in each test specimens. By gradually applying a load force to the fixture only one of the two specimens fractures. Upon fracture of the one specimen, the fixture and the load train lose contact and the second specimen is preserved in a state of upset just prior to fracture. Particular advantages of the fixture are (1) to control the tensile to shear load on the specimen for understanding the effect of these stresses on the deformation behavior of advanced materials, (2) to control the location of fracture for accessing localized material properties including the variation of the mechanical properties and residual stresses across the thickness of advanced materials, (3) to yield a fractured specimen for strength measurement and an unfractured specimen for examining the microstructure just prior to fracture.

Hsueh, Chun-Hway (Knoxville, TN); Liu, Chain-tsuan (Knoxville, TN); George, Easo P. (Knoxville, TN)

2012-07-24T23:59:59.000Z

45

Apparatus for shearing spent nuclear fuel assemblies  

DOE Patents (OSTI)

A method and apparatus are described for shearing spent nuclear fuel assemblies of the type comprising an array of fuel pins disposed within an outer metal shell or shroud. A spent fuel assembly is first compacted in a known manner and then incrementally sheared using fixed and movable shear blades having matched laterally projecting teeth which slidably intermesh to provide the desired shearing action. Incremental advancement of the fuel assembly after each shear cycle is limited to a distance corresponding to the lateral projection of the teeth to ensure fuel assembly breakup into small uniform segments which are amenable to remote chemical processing.

Weil, Bradley S. (Knoxville, TN); Metz, III, Curtis F. (Knoxville, TN)

1980-01-01T23:59:59.000Z

46

High Power Converters for Efficient Transmission Solutions  

Science Conference Proceedings (OSTI)

... Single Valve Double Valve Quadruple Valve ... Includes 14 x 250 MVA 1-phase converter ... Serves 80 x 5 MW offshore wind turbine generators ...

2013-03-01T23:59:59.000Z

47

Energy Converting Article and Method of Making  

A graded composite having a first energy-converting surface layer of carbon bonded carbon fiber (CBCF) for absorbing light, RF, microwaves, ...

48

Converting Unconditioned Basement to Conditioned Space - Code...  

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

Conditioned Space - Code Notes Converting a basement to conditioned space increases the living space of a house. As with most construction activities, the conversion or...

49

Voltage Source Converter Technology for Offshore Grids.  

E-Print Network (OSTI)

??This master thesis has investigated the possible application of voltage source converters (VSC) for the interconnection of offshore installations, i.e. wind farms and petroleum platforms,… (more)

Vormedal, Pål Kristian Myhrer

2010-01-01T23:59:59.000Z

50

Vacuum-insulated catalytic converter  

DOE Patents (OSTI)

A catalytic converter has an inner canister that contains catalyst-coated substrates and an outer canister that encloses an annular, variable vacuum insulation chamber surrounding the inner canister. An annular tank containing phase-change material for heat storage and release is positioned in the variable vacuum insulation chamber a distance spaced part from the inner canister. A reversible hydrogen getter in the variable vacuum insulation chamber, preferably on a surface of the heat storage tank, releases hydrogen into the variable vacuum insulation chamber to conduct heat when the phase-change material is hot and absorbs the hydrogen to limit heat transfer to radiation when the phase-change material is cool. A porous zeolite trap in the inner canister absorbs and retains hydrocarbons from the exhaust gases when the catalyst-coated substrates and zeolite trap are cold and releases the hydrocarbons for reaction on the catalyst-coated substrate when the zeolite trap and catalyst-coated substrate get hot.

Benson, David K. (Golden, CO)

2001-01-01T23:59:59.000Z

51

Reversible shear thickening at low shear rates of electrorheological fluids under electric fields  

E-Print Network (OSTI)

Shear thickening is a phenomenon of significant viscosity increase of colloidal suspensions. While electrorheological (ER) fluids can be turned into a solid-like material by applying an electric field, their shear strength is widely represented by the attractive electrostatic interaction between ER particles. By shearing ER fluids between two concentric cylinders, we show a reversible shear thickening of ER fluids above a low critical shear rate (electric field strength (>100 V/mm), which could be characterized by a modified Mason number. Shear thickening and electrostatic particle interaction-induced inter-particle friction forces is considered to be the real origin of the high shear strength of ER fluids, while the applied electric field controls the extent of shear thickening. The electric field-controlled reversible shear thickening has implications for high-performance ER/magnetorheological (MR) fluid design, clutch fluids with high friction forces triggered by applying local electric field, other field-responsive materials and intelligent systems.

Yu Tian; Minliang Zhang; Jile Jiang; Noshir Pesika; Hongbo Zeng; Jacob Israelachvili; Yonggang Meng; Shizhu Wen

2010-08-24T23:59:59.000Z

52

3-Dimensional Materials Science  

Science Conference Proceedings (OSTI)

Mar 13, 2008 ... Ewarton Alumina Refinery: Patrick Harris1; 1West Indies Alumina Company ..... assumed that the friction of MGs made slippy with the oil slick, ...

53

Shear wall experiments and design in Japan  

SciTech Connect

This paper summarizes the results of recent survey studies on the available experimental data bases and design codes/standards for reinforced concrete (RC) shear wall structures in Japan. Information related to the seismic design of RC reactor buildings and containment structures was emphasized in the survey. The seismic requirements for concrete structures, particularly those related to shear strength design, are outlined. Detailed descriptions are presented on the development of Japanese shear wall equations, design requirements for containment structures, and ductility requirements.

Park, Y.J.; Hofmayer, C.

1994-12-01T23:59:59.000Z

54

Novel shear mechanism in nanolayered composites  

SciTech Connect

Recent studies have shown that two-phase nanocomposite materials with semicoherent interfaces exhibit enhanced strength, deformability, and radiation damage resistance. The remarkable behavior exhibited by these materials has been attributed to the atomistic structure of the bi-metal interface that results in interfaces with low shear strength and hence, strong barriers for slip transmission due to dislocation core spreading along the weak interfaces. In this work, the low interfacial shear strength of Cu/Nb nanoscale multilayers dictates a new mechanism for shear banding and strain softening during micropillar compression. Previous work investigating shear band formation in nanocrystalline materials has shown a connection between insufficient strain hardening and the onset of shear banding in Fe and Fe-10% Cu, but has also shown that hardening does not necessarily offset shear banding in Pd nanomaterials. Therefore, the mechanisms behind shear localization in nanocrystalline materials are not completely understood. Our findings, supported by molecular dynamics simulations, provide insight on the design of nanocomposites with tailored interface structures and geometry to obtain a combination of high strength and deformability. High strength is derived from the ability of the interfaces to trap dislocations through relative ease of interfacial shear, while deformability can be maximized by controlling the effects of loading geometry on shear band formation.

Mara, Nathan [Los Alamos National Laboratory; Bhattacharyya, Dhriti [Los Alamos National Laboratory; Hirth, John P [Los Alamos National Laboratory; Dickerson, Patricia O [Los Alamos National Laboratory; Misra, Amit [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

55

GTRI's Convert program | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

program | National Nuclear Security Administration program | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog GTRI's Convert program Home > About Us > Our Programs > Nonproliferation > Global Threat Reduction Initiative > GTRI's Convert program GTRI's Convert program One of Global Threat Reduction Initiative's (GTRI) three key pillars is

56

Two Fluid Shear-Free Composites  

E-Print Network (OSTI)

Shear-free composite fluids are constructed from two Letelier rotated unaligned perfect fluids. The component fluid parameters necessary to construct a shear-free composite are investigated. A metric in the Stephani-Barnes solution family and a simple stationary metric are discussed.

J. P. Krisch; E. N. Glass

2013-07-03T23:59:59.000Z

57

Waveguide mode converter and method using same  

DOE Patents (OSTI)

A waveguide mode converter converts electromagnetic power being transmitted in a TE.sub.0n or a TM.sub.0n mode, where n is an integer, to an HE.sub.11 mode. The conversion process occurs in a single stage without requiring the power to pass through any intermediate modes. The converter comprises a length of circular corrugated waveguide formed in a multiperiod periodic curve. The period of the curve is selected to couple the desired modes and decouple undesired modes. The corrugation depth is selected to control the phase propagation constant, or wavenumbers, of the input and output modes, thereby preventing coherent coupling to competing modes. In one embodiment, both the period and amplitude of the curve may be selectively adjusted, thereby allowing the converter to be tuned to maximize the conversion efficiency.

Moeller, Charles P. (Del Mar, CA)

1990-01-01T23:59:59.000Z

58

International Peirce-Smith Converting Centennial  

Science Conference Proceedings (OSTI)

... and G. Guzman D. Full Utilization of the Matte Converting Process Energy for Operatiing ... Injection Techniques, Modeling and Process Control. Peirce-Smith ... M. Marinigh. Increasing Capacity and Productivity in the Metals Markets through.

59

Radio frequency digital to analog converter  

E-Print Network (OSTI)

Dynamic performance of high speed, high resolution digital-to-analog converters (DACs) is limited by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock ...

Luschas, Susan, 1975-

2003-01-01T23:59:59.000Z

60

Integrated optical analog-to-digital converter  

E-Print Network (OSTI)

An optically-sampled frequency-demultiplexed wideband analog-to-digital converter (ADC) which has potential to exceed the performance of electronic ADCs by orders of magnitude is studied analytically and numerically. The ...

Khilo, Anatol

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Energy Performance Evaluation of Photovoltaic Power Converters  

Science Conference Proceedings (OSTI)

This work investigates test methods to compare the energy performance of different competing photovoltaic (PV) power converter technologies and topologies. New power converter approaches and technology are regularly introduced in the market, with promises to harness more energy than their competitors. To independently evaluate the performance of these technologies, the Electric Power Research Institute (EPRI) is analyzing existing standards, as well as experimenting with various performance ...

2013-12-23T23:59:59.000Z

62

ANALOG-TO-DIGITAL DATA CONVERTER  

DOE Patents (OSTI)

Electrical apparatus is described, particularly useful in telemetry work, for converting analog signals into electrical pulses and recording them. An electronic editor commands the taking of signal readings at a frequency which varies according to linearity of the analog signal being converted. Readings of information signals are recorded, along with time base readings and serial numbering, if desired, on magnetic tape and the latter may be used to operate a computer or the like. Magnetic tape data may be transferred to punched cards.

Rodgers, G.W.; Althouse, J.E.; Anderson, D.P.; Bussey, G.R.; Minnear, L.H.

1960-09-01T23:59:59.000Z

63

Generation of Bulk Shear Spikes in Shallow Stratified Tidal Seas  

Science Conference Proceedings (OSTI)

Recent finescale observations of shear and stratification in temperate shelf sea thermoclines show that they are of marginal stability, suggesting that episodes of enhanced shear could potentially lead to shear instability and diapcynal mixing. ...

Hans Burchard; Tom P. Rippeth

2009-04-01T23:59:59.000Z

64

Fluid shear-induced hypertrophy in neonatal rat ventricular myocytes  

E-Print Network (OSTI)

subjected to low shear rates, increase their beating ratedue to shear. Beating rates increase nearly 3 fold, which isstress increases protein synthesis rate and induces

Fujimura, Atsushi

2009-01-01T23:59:59.000Z

65

DSI Dipole Shear Sonic Imager | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for DSI Dipole Shear Sonic Imager Citation Schlumberger. DSI Dipole Shear Sonic...

66

Method for shearing spent nuclear fuel assemblies  

DOE Patents (OSTI)

A method is disclosed for shearing spent nuclear fuel assemblies of the type wherein a plurality of long metal tubes packed with ceramic fuel are supported in a spaced apart relationship within an outer metal shell or shroud which provides structural support to the assembly. Spent nuclear fuel assemblies are first compacted in a stepwise manner between specially designed gag-compactors and then sheared into short segments amenable to chemical processing by shear blades contoured to mate with the compacted surface of the fuel assembly.

Weil, Bradley S. (Oak Ridge, TN); Watson, Clyde D. (Knoxville, TN)

1977-01-01T23:59:59.000Z

67

Alternative Fuels Data Center: Michigan Converts Vehicles to Propane,  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Michigan Converts Michigan Converts Vehicles to Propane, Reducing Emissions to someone by E-mail Share Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on Facebook Tweet about Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on Twitter Bookmark Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on Google Bookmark Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on Delicious Rank Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on Digg Find More places to share Alternative Fuels Data Center: Michigan Converts Vehicles to Propane, Reducing Emissions on AddThis.com... April 27, 2013

68

State Energy Program Helping Arkansans Convert to Compressed...  

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

State Energy Program Helping Arkansans Convert to Compressed Natural Gas State Energy Program Helping Arkansans Convert to Compressed Natural Gas January 25, 2012 - 4:30pm Addthis...

69

Isolated and soft-switched power converter  

DOE Patents (OSTI)

An isolated and soft-switched power converter is used for DC/DC and DC/DC/AC power conversion. The power converter includes two resonant tank circuits coupled back-to-back through an isolation transformer. Each resonant tank circuit includes a pair of resonant capacitors connected in series as a resonant leg, a pair of tank capacitors connected in series as a tank leg, and a pair of switching devices with anti-parallel clamping diodes coupled in series as resonant switches and clamping devices for the resonant leg. The power converter is well suited for DC/DC and DC/DC/AC power conversion applications in which high-voltage isolation, DC to DC voltage boost, bidirectional power flow, and a minimal number of conventional switching components are important design objectives. For example, the power converter is especially well suited to electric vehicle applications and load-side electric generation and storage systems, and other applications in which these objectives are important. The power converter may be used for many different applications, including electric vehicles, hybrid combustion/electric vehicles, fuel-cell powered vehicles with low-voltage starting, remote power sources utilizing low-voltage DC power sources, such as photovoltaics and others, electric power backup systems, and load-side electric storage and generation systems.

Peng, Fang Zheng (Knoxville, TN); Adams, Donald Joe (Knoxville, TN)

2002-01-01T23:59:59.000Z

70

Joint cosmological parameters forecast from CFHTLS-cosmic shear and CMB data  

E-Print Network (OSTI)

We present a prospective analysis of a combined cosmic shear and cosmic microwave background data set, focusing on a Canada France Hawaii Telescope Legacy Survey (CFHTLS) type lensing survey and the current WMAP-1 year and CBI data. We investigate the parameter degeneracies and error estimates of a seven parameters model, for the lensing alone as well as for the combined experiments. The analysis is performed using a Monte Carlo Markov Chain calculation, allowing for a more realistic estimate of errors and degeneracies than a Fisher matrix approach. After a detailed discussion of the relevant statistical techniques, the set of the most relevant 2 and 3-dimensional lensing contours are given. It is shown that the combined cosmic shear and CMB is particularly efficient to break some parameter degeneracies. The principal components directions are computed and it is found that the most orthogonal contours between the two experiments are for the parameter pairs (Omega_m,sigma_8), (h,ns) and (ns,nrun), where ns and nrun are the slope of the primordial mass power spectrum and the running spectral index respectively. It is shown that an improvement of a factor 2 is expected on the running spectral index from the combined data sets. Forecasts for error improvements from a wide field space telescope lensing survey are also given.

I. Tereno; O. Doré; L. van Waerbeke; Y. Mellier

2004-04-15T23:59:59.000Z

71

Convectively Coupled Waves in a Sheared Environment  

Science Conference Proceedings (OSTI)

A linear stability analysis, about a radiative–convective equilibrium in a sheared environment, on an equatorial beta plane, for a simple multicloud model for organized tropical convection is presented here. Both vertical/baroclinic and ...

Ying Han; Boualem Khouider

2010-09-01T23:59:59.000Z

72

Statistics on Vertical Wind Shear over Oceans  

Science Conference Proceedings (OSTI)

Statistics on boundary layer vertical wind shear were gathered from rawinsonde soundings taken from three small islands and one weather ship. These soundings show a high correlation between surface and 1829 m altitude wind directions. Wind speeds ...

Donald P. Wylie; Barry B. Hinton; Kellie M. Millett

1984-06-01T23:59:59.000Z

73

Shear Excitation of Atmospheric Gravity Waves  

Science Conference Proceedings (OSTI)

Unstable Velocity shears are a Common source of vertically propagating gravity waves in the atmosphere. However, the growth rates of unstable modes predicted by linear theory cannot always amount for their observed importance.

David C. Fritts

1982-09-01T23:59:59.000Z

74

Thermionic converters using cylindrical refractory metal emitters  

DOE Green Energy (OSTI)

The construction and operation of four converters is described. Two converters using tantalum emitters operated satisfactorily but temperatures of the order of 2500 deg K were necessary to obtain power densities of 6 watts/cm2. Closer spaced diodes using molybdenum emitters were not initially successful due to internal short circuiting; this was caused partly by evaporated films but mainly by liquid caesium. One of these diodes was modified and yielded 2.6 watts/cm2 at 1610 deg K. (auth)

Bainton, K.F.

1964-09-15T23:59:59.000Z

75

Shear banding in soft glassy materials  

E-Print Network (OSTI)

Many soft materials, including foams, dense emulsions, micro gel bead suspensions, star polymers, dense packing of surfactant onion micelles, and textured morphologies of liquid crystals, share the basic "glassy" features of structural disorder and metastability. These in turn give rise to several notable features in the low frequency shear rheology (deformation and flow properties) of these materials: in particular, the existence of a yield stress below which the material behaves like a solid, and above which it flows like a liquid. In the last decade, intense experimental activity has also revealed that these materials often display a phenomenon known as shear banding, in which the flow profile across the shear cell exhibits macroscopic bands of different viscosity. Two distinct classes of yield stress fluid have been identified: those in which the shear bands apparently persist permanently (for as long as the flow remains applied), and those in which banding arises only transiently during a process in which a steady flowing state is established out of an initial rest state (for example, in a shear startup or step stress experiment). After surveying the motivating experimental data, we describe recent progress in addressing it theoretically, using the soft glassy rheology model and a simple fluidity model. We also briefly place these theoretical approaches in the context of others in the literature, including elasto-plastic models, shear transformation zone theories, and molecular dynamics simulations. We discuss finally some challenges that remain open to theory and experiment alike.

Suzanne M. Fielding

2013-09-13T23:59:59.000Z

76

Mixing in a Moderately Sheared Salt-Fingering Layer  

Science Conference Proceedings (OSTI)

Mixing due to sheared salt fingers is studied by means of direct numerical simulations (DNS) of a double-diffusively unstable shear layer. The focus is on the “moderate shear” case, where shear is strong enough to produce Kelvin–Helmholtz (KH) ...

W. D. Smyth; S. Kimura

2011-07-01T23:59:59.000Z

77

Provably secure convertible undeniable signatures with unambiguity  

Science Conference Proceedings (OSTI)

This paper shows some efficient and provably-secure convertible undeniable signature schemes (with both selective conversion and all conversion), in the standard model and discrete logarithm setting. They further satisfy unambiguity, which is traditionally ... Keywords: anonymous signatures, discrete logarithm, selective/all conversion, standard model, undeniable signatures

Le Trieu Phong; Kaoru Kurosawa; Wakaha Ogata

2010-09-01T23:59:59.000Z

78

Multilevel converters for large electric drives  

SciTech Connect

Traditional two-level high frequency pulse width modulation (PWM) inverters for motor drives have several problems associated with their high frequency switching which produces common-mode voltage and high voltage change (dV/dt) rates to the motor windings. Multilevel inverters solve these problems because their devices can switch at a much lower frequency. Two different multilevel topologies are identified for use as a converter for electric drives, a cascade inverter with separate dc sources and a back-to-back diode clamped converter. The cascade inverter is a natural fit for large automotive all electric drives because of the high VA ratings possible and because it uses several levels of dc voltage sources which would be available from batteries or fuel cells. The back to back diode damped converter is ideal where a source of ac voltage is available such as a hybrid electric vehicle. Simulation and experimental results show the superiority of these two converters over PWM based drives.

Tolbert, L.M.; Peng, F.Z.

1997-11-01T23:59:59.000Z

79

Shear-current effect in a turbulent convection with a large-scale shear  

E-Print Network (OSTI)

The shear-current effect in a nonrotating homogeneous turbulent convection with a large-scale constant shear is studied. The large-scale velocity shear causes anisotropy of turbulent convection, which produces the mean electromotive force $\\bec{\\cal E}^{(W)} \\propto {\\bf W} {\\bf \\times} {\\bf J}$ and the mean electric current along the original mean magnetic field, where ${\\bf W}$ is the background mean vorticity due to the shear and ${\\bf J}$ is the mean electric current. This results in a large-scale dynamo even in a nonrotating and nonhelical homogeneous sheared turbulent convection, whereby the $\\alpha$ effect vanishes. It is found that turbulent convection promotes the shear-current dynamo instability, i.e., the heat flux causes positive contribution to the shear-current effect. However, there is no dynamo action due to the shear-current effect for small hydrodynamic and magnetic Reynolds numbers even in a turbulent convection, if the spatial scaling for the turbulent correlation time is $\\tau(k) \\propto k^{-2}$, where $k$ is the small-scale wave number.

I. Rogachevskii; N. Kleeorin

2007-02-24T23:59:59.000Z

80

Sequentially linear analysis of shear critical reinforced concrete beams without shear reinforcement  

Science Conference Proceedings (OSTI)

Analyzing brittle structures with nonlinear finite element analysis is frequently attended with numerical problems. As an alternative method sequentially linear analysis could be utilized, resulting in the avoidance of convergence and bifurcation problems. ... Keywords: Brittle failure behavior, Cracking, Reinforced concrete, Sequentially linear analysis, Shear critical beam, Shear retention

A. T. Slobbe; M. A. N. Hendriks; J. G. Rots

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Pressure-shear experiments on granular materials.  

SciTech Connect

Pressure-shear experiments were performed on granular tungsten carbide and sand using a newly-refurbished slotted barrel gun. The sample is a thin layer of the granular material sandwiched between driver and anvil plates that remain elastic. Because of the obliquity, impact generates both a longitudinal wave, which compresses the sample, and a shear wave that probes the strength of the sample. Laser velocity interferometry is employed to measure the velocity history of the free surface of the anvil. Since the driver and anvil remain elastic, analysis of the results is, in principal, straightforward. Experiments were performed at pressures up to nearly 2 GPa using titanium plates and at higher pressure using zirconium plates. Those done with the titanium plates produced values of shear stress of 0.1-0.2 GPa, with the value increasing with pressure. On the other hand, those experiments conducted with zirconia anvils display results that may be related to slipping at an interface and shear stresses mostly at 0.1 GPa or less. Recovered samples display much greater particle fracture than is observed in planar loading, suggesting that shearing is a very effective mechanism for comminution of the grains.

Reinhart, William Dodd (Sandia National Laboratories, Albuquerque, NM); Thornhill, Tom Finley, III (, Sandia National Laboratories, Albuquerque, NM); Vogler, Tracy John; Alexander, C. Scott (Sandia National Laboratories, Albuquerque, NM)

2011-10-01T23:59:59.000Z

82

A square root analog to digital converter to optimally convert photonic signals for computed tomography  

E-Print Network (OSTI)

The arrival of photons at a given location is a Poisson process with an associated shot noise which rises with the square root of the number of photons received. An analog-to-digital converter (ADC) with a square root ...

Bieniosek, Matthew (Matthew F.)

2010-01-01T23:59:59.000Z

83

Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Landfills Convert Landfills Convert Biogas Into Renewable Natural Gas to someone by E-mail Share Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on Facebook Tweet about Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on Twitter Bookmark Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on Google Bookmark Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on Delicious Rank Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on Digg Find More places to share Alternative Fuels Data Center: Landfills Convert Biogas Into Renewable Natural Gas on AddThis.com... May 25, 2013 Landfills Convert Biogas Into Renewable Natural Gas

84

Cosmic Shear from STIS Pure Parallels: Analysis  

E-Print Network (OSTI)

The measurement of cosmic shear requires deep imaging with high image quality on many lines of sight to sample the statistics of large-scale structure. The expected distortion of galaxy images by cosmic shear on the STIS angular scale is a few percent, therefore the PSF anisotropy has to be understood and controlled to an accuracy better than 1%. In this poster we present the analysis of the PSF of STIS and a preliminary cosmic shear measurement using archival data from the STIS pure parallel program to show that the STIS camera on-board HST is well suited for our project. The data reduction and catalog production are described in an accompanying paper (astro-ph/0102330).

H. Haemmerle; J. -M. Miralles; P. Schneider; T. Erben; R. A. E. Fosbury; W. Freudling; N. Pirzkal; S. D. M. White

2001-09-27T23:59:59.000Z

85

Component technology for Stirling power converters  

DOE Green Energy (OSTI)

NASA Lewis Research Center has organized a component technology program as part of the efforts to develop Stirling converter technology for space power applications. The Stirling space power program is part of the NASA High Capacity Power Project of the Civil Space Technology Initiative (CSTI). NASA Lewis is also providing technical management for a DOE/Sandia program to develop Stirling converters for solar terrestrial power producing electricity for the utility grid. The primary contractors for the space power and solar terrestrial programs develop component technologies directly related to their program goals. This Lewis component technology effort, while coordinated with the main programs, aims at longer term issues, advanced technologies, and independent assessments. This paper will present an overview of work on linear alternators, engine/alternator/load interactions and controls, heat exchangers, materials, life and reliability, and bearings.

Thieme, L.G.

1994-09-01T23:59:59.000Z

86

APPARATUS FOR CONVERTING HEAT INTO ELECTRICITY  

DOE Patents (OSTI)

This patent shows an apparatus for converting heat to electricity. It includes a galvanic cell having an anodic metal anode, a fused salt electrolyte, and a hydrogen cathode having a diffusible metal barrier of silver-- palladium alloy covered with sputtered iron on the side next to the fused electrolyte. Also shown is a regenerator for regenerating metal hydride produced by the galvanic cell into hydrogen gas and anodic metal, both of which are recycled. (AEC)

Crouthamel, C.E.; Foster, M.S.

1964-01-28T23:59:59.000Z

87

Spectral converters and luminescent solar concentrators  

E-Print Network (OSTI)

In this paper we present a comprehensive theoretical description of molecular spectral converters in the specific context of Luminescent Solar Concentrators (LSCs). The theoretical model is an extension to a three-level system interacting with a solar radiation bath of the standard quantum theory of atomic radiative processes. We derive the equilibrium equations of the conversion process and provide specific examples of application of this principle to the development of solar concentration devices.

Petra F. Scudo; Luigi Abbondanza; Roberto Fusco

2009-07-21T23:59:59.000Z

88

Spectral converters and luminescent solar concentrators  

E-Print Network (OSTI)

In this paper we present a comprehensive theoretical description of molecular spectral converters in the specific context of Luminescent Solar Concentrators (LSCs). The theoretical model is an extension to a three-level system interacting with a solar radiation bath of the standard quantum theory of atomic radiative processes. We derive the equilibrium equations of the conversion process and provide specific examples of application of this principle to the development of solar concentration devices.

Scudo, Petra F; Fusco, Roberto

2009-01-01T23:59:59.000Z

89

Nonlinear shear-current dynamo and magnetic helicity transport in sheared turbulence  

E-Print Network (OSTI)

The nonlinear mean-field dynamo due to a shear-current effect in a nonhelical homogeneous turbulence with a mean velocity shear is discussed. The transport of magnetic helicity as a dynamical nonlinearity is taken into account. The shear-current effect is associated with the ${\\bf W} {\\bf \\times} {\\bf J}$ term in the mean electromotive force, where ${\\bf W}$ is the mean vorticity due to the large-scale shear motions and ${\\bf J}$ is the mean electric current. This effect causes the generation of large-scale magnetic field in a turbulence with large hydrodynamic and magnetic Reynolds numbers. The dynamo action due to the shear-current effect depends on the spatial scaling of the correlation time $\\tau(k)$ of the background turbulence, where $k$ is the wave number. For Kolmogorov scaling, $\\tau(k) \\propto k^{-2/3}$, the dynamo instability occurs, while when $\\tau(k) \\propto k^{-2}$ (small hydrodynamic and magnetic Reynolds numbers) there is no the dynamo action in a sheared nonhelical turbulence. The magnetic helicity flux strongly affects the magnetic field dynamics in the nonlinear stage of the dynamo action. Numerical solutions of the nonlinear mean-field dynamo equations which take into account the shear-current effect, show that if the magnetic helicity flux is not small, the saturated level of the mean magnetic field is of the order of the equipartition field determined by the turbulent kinetic energy. Turbulence with a large-scale velocity shear is a universal feature in astrophysics, and the obtained results can be important for elucidation of origin of the large-scale magnetic fields in astrophysical sheared turbulence.

I. Rogachevskii; N. Kleeorin; E. Liverts

2006-09-10T23:59:59.000Z

90

Rapid Intensification of a Sheared Tropical Storm  

Science Conference Proceedings (OSTI)

A weak tropical storm (Gabrielle in 2001) experienced a 22-hPa pressure fall in less than 3 h in the presence of 13 m s?1 ambient vertical wind shear. A convective cell developed downshear left of the center and moved cyclonically and inward to ...

John Molinari; David Vollaro

2010-10-01T23:59:59.000Z

91

Shear-induced fragmentation of Laponite suspensions  

E-Print Network (OSTI)

Simultaneous rheological and velocity profile measurements are performed in a smooth Couette geometry on Laponite suspensions seeded with glass microspheres and undergoing the shear-induced solid-to-fluid (or yielding) transition. Under these slippery boundary conditions, a rich temporal behaviour is uncovered, in which shear localization is observed at short times, that rapidly gives way to a highly heterogeneous flow characterized by intermittent switching from plug-like flow to linear velocity profiles. Such a temporal behaviour is linked to the fragmentation of the initially solid sample into blocks separated by fluidized regions. These solid pieces get progressively eroded over time scales ranging from a few minutes to several hours depending on the applied shear rate $\\dot{\\gamma}$. The steady-state is characterized by a homogeneous flow with almost negligible wall slip. The characteristic time scale for erosion is shown to diverge below some critical shear rate $\\dot{\\gamma}^\\star$ and to scale as $(\\dot{\\gamma}-\\dot{\\gamma}^\\star)^{-n}$ with $n\\simeq 2$ above $\\dot{\\gamma}^\\star$. A tentative model for erosion is discussed together with open questions raised by the present results.

Thomas Gibaud; Catherine Barentin; Nicolas Taberlet; Sébastien Manneville

2009-04-06T23:59:59.000Z

92

Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Virginia Converts Virginia Converts Vehicles to Propane in Spotsylvania County to someone by E-mail Share Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on Facebook Tweet about Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on Twitter Bookmark Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on Google Bookmark Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on Delicious Rank Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on Digg Find More places to share Alternative Fuels Data Center: Virginia Converts Vehicles to Propane in Spotsylvania County on AddThis.com...

93

Alternative Fuels Data Center: Empire Coachworks Converts Limousines to  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Empire Coachworks Empire Coachworks Converts Limousines to Natural Gas to someone by E-mail Share Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on Facebook Tweet about Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on Twitter Bookmark Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on Google Bookmark Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on Delicious Rank Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on Digg Find More places to share Alternative Fuels Data Center: Empire Coachworks Converts Limousines to Natural Gas on AddThis.com... Jan. 14, 2010 Empire Coachworks Converts Limousines to Natural Gas

94

Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Atlanta Airport Atlanta Airport Converts Shuttles to CNG to someone by E-mail Share Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on Facebook Tweet about Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on Twitter Bookmark Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on Google Bookmark Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on Delicious Rank Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on Digg Find More places to share Alternative Fuels Data Center: Atlanta Airport Converts Shuttles to CNG on AddThis.com... Sept. 9, 2012 Atlanta Airport Converts Shuttles to CNG L earn how an Atlanta company saves money and conserves fuel with compressed natural gas airport shuttles.

95

Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Veolia Transportation Veolia Transportation Converts Taxi Fleet to Propane to someone by E-mail Share Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on Facebook Tweet about Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on Twitter Bookmark Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on Google Bookmark Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on Delicious Rank Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on Digg Find More places to share Alternative Fuels Data Center: Veolia Transportation Converts Taxi Fleet to Propane on AddThis.com... Aug. 17, 2013 Veolia Transportation Converts Taxi Fleet to Propane

96

2008 High-Megawatt Power Converter Technology R&D ...  

Science Conference Proceedings (OSTI)

... 2008 High-Megawatt Power Converter Technology R&D Roadmap Workshop. NIST, Gaithersburg, MD. April 8, 2008. On ...

2013-05-30T23:59:59.000Z

97

Solid state transport-based thermoelectric converter - Energy ...  

A solid state thermoelectric converter includes a thermally insulating separator layer, ... Advanced Materials; Biomass and Biofuels; Building Energy Efficiency;

98

Shear Excitation of Atmospheric Gravity Waves. Part II: Nonlinear Radiation from a Free Shear Layer  

Science Conference Proceedings (OSTI)

This paper addresses the efficiency and characteristics of two mechanisms that have been proposed to account for the excitation of radiating gravity waves by Kelvin-Helmholtz (KH) instabilities at a free shear layer in a stratified atmosphere. ...

David C. Fritts

1984-02-01T23:59:59.000Z

99

Voltage balanced multilevel voltage source converter system  

SciTech Connect

A voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter. The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means.

Peng, Fang Zheng (Oak Ridge, TN); Lai, Jih-Sheng (Knoxville, TN)

1997-01-01T23:59:59.000Z

100

Voltage balanced multilevel voltage source converter system  

SciTech Connect

Disclosed is a voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter. The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationship with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means. 15 figs.

Peng, F.Z.; Lai, J.S.

1997-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Solar-energy-process-converter system  

SciTech Connect

A solar-energy-process-converter system whereby the energy from the sun is accumulated and projected by a parabolic reflector so as to impinge upon a cluster of thermocouples to create electrical energy for activating an electrolysis unit through which hydrogen and oxygen are generated and stored. The system can also include a steam-turbine electrical-generator plant that is adapted to be operated by the burning of the hydrogen and oxygen, and the gases can further be used to establish heat to drive a thermocouple electrical-generator plant, wherein the stored hydrogen is further employed as a fuel for vehicle and other engines.

Shinn, W.A.

1981-01-20T23:59:59.000Z

102

Gravity Waves Generated by Sheared Potential Vorticity Anomalies  

Science Conference Proceedings (OSTI)

The gravity waves (GWs) generated by potential vorticity (PV) anomalies in a rotating stratified shear flow are examined under the assumptions of constant vertical shear, two-dimensionality, and unbounded domain. Near a PV anomaly, the associated ...

François Lott; Riwal Plougonven; Jacques Vanneste

2010-01-01T23:59:59.000Z

103

Response of Baroclinic Life Cycles to Barotropic Shear  

Science Conference Proceedings (OSTI)

Cyclonic barotropic shear of incrementally increasing magnitude is imposed on an idealized midlatitude jet, and the life cycles of baroclinically unstable wavenumber 6 perturbations growing on these jets are studied. When the barotropic shear ...

Dennis L. Hartmann; Peter Zuercher

1998-02-01T23:59:59.000Z

104

Direction of Hurricane Beta Drift in Horizontally Sheared Flows  

Science Conference Proceedings (OSTI)

The impacts of linear environmental shears on beta drift direction are assessed through numerical experiments with a single-layer, primitive equation model. It is found that cyclonic (anticyclonic) shears turn the beta drift more westward (...

Bin Wang; Xiaofan Li; Liguang Wu

1997-06-01T23:59:59.000Z

105

A Statistical Model of Vertical Shear from Moored Current Meters  

Science Conference Proceedings (OSTI)

We derive a statistical model or shear to predict how measurement of mean-square shear vary with stratification and with vertical separation ?z between moored current meters. Our model is based on a simplified version of the vertical wavenumber-...

David Rubenstein; Fred Newman; Walt Grabowski

1983-06-01T23:59:59.000Z

106

Shear and Extensional Rheology of Cellulose/Ionic Liquid Solutions  

E-Print Network (OSTI)

In this study, we characterize the shear and extensional rheology of dilute to semidilute solutions of cellulose in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIAc). In steady shear flow, the semidilute solutions ...

Haward, Simon J.

107

Gravity Currents in Confined Channels with Environmental Shear  

Science Conference Proceedings (OSTI)

This study examines properties of gravity currents in confined channels with sheared environmental flow. Under the assumptions of steady and inviscid flow, two-dimensional analytic solutions are obtained for a wide range of shear values. The slope ...

George H. Bryan; Richard Rotunno

108

Suppression of Baroclinic Instability in Horizontally Sheared Flows  

Science Conference Proceedings (OSTI)

Baroclinic instability in the presence of a meridionally sheared barotropic component to the basic flow is studied using a two-level model. The inclusion of a linear shear results in merldionally confined normal modes with growth rates much ...

I. N. James

1987-12-01T23:59:59.000Z

109

Elastic capsules in shear flow: Analytical solutions for constant and time-dependent shear rates  

E-Print Network (OSTI)

We investigate the dynamics of microcapsules in linear shear flow within a reduced model with two degrees of freedom. In previous work for steady shear flow, the dynamic phases of this model, i.e. swinging, tumbling and intermittent behaviour, have been identified using numerical methods. In this paper, we integrate the equations of motion in the quasi-spherical limit analytically for time-constant and time-dependent shear flow using matched asymptotic expansions. Using this method, we find analytical expressions for the mean tumbling rate in general time-dependent shear flow. The capsule dynamics is studied in more detail when the inverse shear rate is harmonically modulated around a constant mean value for which a dynamic phase diagram is constructed. By a judicious choice of both modulation frequency and phase, tumbling motion can be induced even if the mean shear rate corresponds to the swinging regime. We derive expressions for the amplitude and width of the resonance peaks as a function of the modulation frequency.

Steffen Kessler; Reimar Finken; Udo Seifert

2009-02-26T23:59:59.000Z

110

Single Inductor Dual Output Buck Converter  

E-Print Network (OSTI)

The portable electronics market is rapidly migrating towards more compact devices with multiple functionalities. Form factor, performance, cost and efficiency of these devices constitute the factors of merit of devices like cell phones, MP3 players and PDA's. With advancement in technology and more intelligent processors being used, there is a need for multiple high integrity voltage supplies for empowering the systems in portable electronic devices. Switched mode power supplies (SMPS's) are used to regulate the battery voltage. In an SMPS, maximum area is taken by the passive components such as the inductor and the capacitor. This work demonstrates a single inductor used in a buck converter with two output voltages from an input battery with voltage of value 3V. The main focus areas are low cross regulation between the outputs and supply of completely independent load current levels while maintaining desired values (1.2V,1.5V) within well controlled ripple levels. Dynamic hysteresis control is used for the single inductor dual output buck converter in this work. Results of schematic and post layout simulations performed in CADENCE prove the merits of this control method, such as nil cross regulation and excellent transient response.

Eachempatti, Haritha

2009-05-01T23:59:59.000Z

111

Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Golden Eagle Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG to someone by E-mail Share Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on Facebook Tweet about Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on Twitter Bookmark Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on Google Bookmark Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on Delicious Rank Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on Digg Find More places to share Alternative Fuels Data Center: Golden Eagle Distributors Inc. to Convert Entire Fleet to CNG on AddThis.com...

112

Flocculation of model algae under shear.  

Science Conference Proceedings (OSTI)

We present results of molecular dynamics simulations of the flocculation of model algae particles under shear. We study the evolution of the cluster size distribution as well as the steady-state distribution as a function of shear rates and algae interaction parameters. Algal interactions are modeled through a DLVO-type potential, a combination of a HS colloid potential (Everaers) and a yukawa/colloid electrostatic potential. The effect of hydrodynamic interactions on aggregation is explored. Cluster strucuture is determined from the algae-algae radial distribution function as well as the structure factor. DLVO parameters including size, salt concentration, surface potential, initial volume fraction, etc. are varied to model different species of algae under a variety of environmental conditions.

Pierce, Flint; Lechman, Jeremy B.

2010-11-01T23:59:59.000Z

113

Converting syncrudes to transportation fuels: Appendix 1  

DOE Green Energy (OSTI)

Syncrudes derived from oil shale and those produced in direct coal liquefaction processes can be converted to transportation fuels using modern commercial hydroprocessing technology. Upgrading routes typically consist of hydrogen addition and removal of heteroatom and inorganic impurities. This paper reviews refining routes and discusses the properties of finished transportation fuel products (gasoline, jet fuel, diesel) produced from syncrudes. Fuels produced from bituminous coal, subbituminous coal, and lignite are contrasted with those produced from oil shale and petroleum. Transportation fuels from shale oil resemble those from waxy petroleum crudes. Upgraded products from liquids made in H-Coal, EDS, and SRC-II direct coal liquefaction processes are low in paraffin content and consist mainly of cyclic hydrocarbons. As a result, the latter have some unusual and desirable properties for transportation fuels. 14 refs., 8 figs., 8 tabs.

Sullivan, R.F.; O'Rear, D.J.; Frumkin, H.A.

1981-01-01T23:59:59.000Z

114

Converting energy from fusion into useful forms  

E-Print Network (OSTI)

If fusion power reactors are to be feasible, it will still be necessary to convert the energy of the nuclear reaction into usable form. The heat produced will be removed from the reactor core by a primary coolant, which might be water, helium, molten lithium-lead, molten lithium-containing salt, or CO2. The heat could then be transferred to a conventional Rankine cycle or Brayton (gas turbine) cycle. Alternatively it could be used for thermochemical processes such as producing hydrogen or other transport fuels. Fusion presents new problems because of the high energy neutrons released. These affect the selection of materials and the operating temperature, ultimately determining the choice of coolant and working cycle. The limited temperature ranges allowed by present day irradiated structural materials, combined with the large internal power demand of the plant, will limit the overall thermal efficiency. The operating conditions of the fusion power source, the materials, coolant, and energy conversion system w...

Kovari, M; Jenkins, I; Kiely, C

2014-01-01T23:59:59.000Z

115

Modular Power Converters for PV Applications  

DOE Green Energy (OSTI)

This report describes technical opportunities to serve as parts of a technological roadmap for Shoals Technologies Group in power electronics for PV applications. There are many different power converter circuits that can be used for solar inverter applications. The present applications do not take advantage of the potential for using common modules. We envision that the development of a power electronics module could enable higher reliability by being durable and flexible. Modules would have fault current limiting features and detection circuits such that they can limit the current through the module from external faults and can identify and isolate internal faults such that the remaining modules can continue to operate with only minimal disturbance to the utility or customer. Development of a reliable, efficient, low-cost, power electronics module will be a key enabling technology for harnessing more power from solar panels and enable plug and play operation. Power electronics for computer power supplies, communication equipment, and transportation have all targeted reliability and modularity as key requirements and have begun concerted efforts to replace monolithic components with collections of common smart modules. This is happening on several levels including (1) device level with intelligent control, (2) functional module level, and (3) system module. This same effort is needed in power electronics for solar applications. Development of modular units will result in standard power electronic converters that will have a lower installed and operating cost for the overall system. These units will lead to increased adaptability and flexibility of solar inverters. Incorporating autonomous fault current limiting and reconfiguration capabilities into the modules and having redundant modules will lead to a durable converter that can withstand the rigors of solar power generation for more than 30 years. Our vision for the technology roadmap is that there is no need for detailed design of new power converters for each new application or installation. One set of modules and controllers can be pre-developed and the only design question would be how many modules need to be in series or parallel for the specific power requirement. Then, a designer can put the modules together and add the intelligent reconfigurable controller. The controller determines how many modules are connected, but it might also ask for user input for the specific application during setup. The modules include protection against faults and can reset it, if necessary. In case of a power device failure, the controller reconfigures itself to continue limited operation until repair which might be as simple as taking the faulty module out and inserting a new module. The result is cost savings in design, maintenance, repair, and a grid that is more reliable and available. This concept would be a perfect fit for the recently announced funding opportunity announcement (DE-FOA-0000653) on Plug and Play Photovoltaics.

Ozpineci, Burak [ORNL; Tolbert, Leon M [ORNL

2012-05-01T23:59:59.000Z

116

Direct Numerical Simulation of Surfactant-Stabilized Emulsions Morphology and Shear Viscosity in Starting Shear Flow  

SciTech Connect

A 3D lattice Boltzmann model for two-phase flow with amphiphilic surfactant was used to investigate the evolution of emulsion morphology and shear stress in starting shear flow. The interfacial contributions were analyzed for low and high volume fractions and varying surfactant activity. A transient viscoelastic contribution to the emulsion rheology under constant strain rate conditions was attributed to the interfacial stress. For droplet volume fractions below 0.3 and an average capillary number of about 0.25, highly elliptical droplets formed. Consistent with affine deformation models, gradual elongation of the droplets increased the shear stress at early times and reduced it at later times. Lower interfacial tension with increased surfactant activity counterbalanced the effect of increased interfacial area, and the net shear stress did not change significantly. For higher volume fractions, co-continuous phases with a complex topology were formed. The surfactant decreased the interfacial shear stress due mainly to advection of surfactant to higher curvature areas. Our results are in qualitative agreement with experimental data for polymer blends in terms of transient interfacial stresses and limited enhancement of the emulsion viscosity at larger volume fractions where the phases are co-continuous.

Roar Skartlien; Espen Sollum; Andreas Akselsen; Paul Meakin

2012-07-01T23:59:59.000Z

117

Integrated Solar Power Converters: Wafer-Level Sub-Module Integrated DC/DC Converter  

Science Conference Proceedings (OSTI)

Solar ADEPT Project: CU-Boulder is developing advanced power conversion components that can be integrated into individual solar panels to improve energy yields. The solar energy that is absorbed and collected by a solar panel is converted into useable energy for the grid through an electronic component called an inverter. Many large, conventional solar energy systems use one, central inverter to convert energy. CU-Boulder is integrating smaller, microinverters into individual solar panels to improve the efficiency of energy collection. The University’s microinverters rely on electrical components that direct energy at high speeds and ensure that minimal energy is lost during the conversion process—improving the overall efficiency of the power conversion process. CU-Boulder is designing its power conversion devices for use on any type of solar panel.

None

2012-02-09T23:59:59.000Z

118

Manufacturing cost of flame heated thermionic converters. Topical report  

DOE Green Energy (OSTI)

The cost of thermionic converters has been estimated in support of the cost calculations for thermionic topping of central station powerplants. These calculations supersede the previous calculations made in 1975 and use a design concept similar to the current configuration of flame-heated converters. The cost of converters was estimated by obtaining quotations from manufactureres whenever possible. The selling cost was found to be $110 per kilowatt.

LaRue, G.; Miskolczy, G.

1979-04-01T23:59:59.000Z

119

Modeling and Controller Design of a Wind Energy Conversion System Including a Matrix Converter.  

E-Print Network (OSTI)

??In this thesis, a grid-connected wind-energy converter system including a matrix converter is proposed. The matrix converter, as a power electronic converter, is used to… (more)

Barakati, Seyed Masoud

2008-01-01T23:59:59.000Z

120

GTRI's Convert Program: Minimizing the Use of Highly Enriched...  

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

Flickr RSS Twitter YouTube GTRI's Convert Program: Minimizing the Use of Highly Enriched Uranium | National Nuclear Security Administration Our Mission Managing the Stockpile...

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Improvements on Converter Operating Practice at Mufulira Smelter ...  

Science Conference Proceedings (OSTI)

Abstract Scope, With the commisioning of the 850,000 tonnes of Concentrate treated per annum capacity Isasmelt in September 2006 the Converter section ...

122

Research Projects to Convert Captured CO2 Emissions to Useful...  

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

July 06, 2010 Research Projects to Convert Captured CO2 Emissions to Useful Products Six Projects Selected by DOE Will Further Important Technologies for Helping Reduce CO2...

123

Weekly Wrap-Up: Testing Wind Blades, Converting Carbon Emissions...  

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

Chu announced six projects that aim to find ways of convert captured carbon dioxide (CO2) emissions from industrial sources into useful products. The innovative projects -...

124

Method of converting an existing vehicle powertrain to a hybrid ...  

A method of converting an existing vehicle powertrain including a manual transmission to a hybrid powertrain system with an automated powertrain transmission. The ...

125

Design and Testing of a Thermoacoustic Power Converter .  

E-Print Network (OSTI)

??Thermoacoustic engines convert heat into acoustic pressure waves with no moving parts; this inherently results in high reliability, low maintenance and low manufacturing costs. Significant… (more)

Telesz, Mark P.

2006-01-01T23:59:59.000Z

126

Shear viscosity in the postquasistatic approximation  

Science Conference Proceedings (OSTI)

We apply the postquasistatic approximation, an iterative method for the evolution of self-gravitating spheres of matter, to study the evolution of anisotropic nonadiabatic radiating and dissipative distributions in general relativity. Dissipation is described by viscosity and free-streaming radiation, assuming an equation of state to model anisotropy induced by the shear viscosity. We match the interior solution, in noncomoving coordinates, with the Vaidya exterior solution. Two simple models are presented, based on the Schwarzschild and Tolman VI solutions, in the nonadiabatic and adiabatic limit. In both cases, the eventual collapse or expansion of the distribution is mainly controlled by the anisotropy induced by the viscosity.

Peralta, C.; Rosales, L.; Rodriguez-Mueller, B.; Barreto, W. [Deutscher Wetterdienst, Frankfurter Str. 135, 63067 Offenbach (Germany); Laboratorio de Fisica Computacional, Universidad Experimental Politecnica 'Antonio Jose de Sucre', Puerto Ordaz (Venezuela, Bolivarian Republic of); Computational Science Research Center, College of Sciences, San Diego State University, San Diego, California (United States); Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de Los Andes, Merida (Venezuela, Bolivarian Republic of)

2010-05-15T23:59:59.000Z

127

Converting sensitive waste into cleaner energy  

DOE Green Energy (OSTI)

The destruction of sensitive unclassified information (SUI) has always been expensive due to the need for special controls to ensure its protection from disclosure to unauthorized persons. The sensitive documents were shredded, buried at the landfill, or sent to a recycling company. The Department of Energy (DOE) Idaho National Engineering and Environmental Laboratory (INEEL), operated by Lockheed Martin Idaho Technologies Company (LMITCO), has created an innovative method to dispose of its sensitive unclassified paper waste which has security, economic, and environmental benefits. A new cubing facility at the INEEL converts office and industrial waste into compact cubes which are then combined with coal and burned as a source of heat and process steam to run the Idaho Chemical Processing Plant (ICPP) facility. The process-engineered fuel, consisting of 25% cubes and 75% coal, bums cleaner than coal with lower emissions of sulfur dioxide and nitrogen oxides. The alternative fuel also reduces fuel costs, eliminates paying a recycling company, reduces the expense of landfill disposal, increases the life of the landfill, and provides energy to operate a large facility. The Operations Security (OPSEC) team capitalized on this waste to energy technology by recommending that the large quantities of sensitive information (documents) generated at the INEEL be disposed of in this manner. In addition to the economic and environmental benefits, this disposal method minimizes the vulnerabilities of SUI from disclosure to unauthorized personnel. The {open_quotes}cuber{close_quotes} technology has potential application in government and industry for protection of SUI.

Schriner, D.; Skinner, R.

1997-10-01T23:59:59.000Z

128

Converter-fed subsea motor drives  

SciTech Connect

A subsea adjustable-speed motor fed via a long cable in range of several tens of kilometers between the converter and the motor are analyzed by simulations. Due to resonance, one critical frequency range occurs where significant generation of harmonics from the inverter should be avoided. A voltage source inverter is more feasible than a current source inverter since it is easier to modify the output waveform in order to avoid resonance problems. The resistive voltage drop in the long cable reduces the air-gap torque of the motor particular at low frequencies. This causes a problem for the start-up of the motor due to stiction torque. A start-up strategy is envisaged which is a compromise between voltage boost, inverter current, and transformer core dimensions. In normal operation mode the inverter voltage is proportional to the frequency. An open speed lop is used which keeps the system stable for potential load variations. The results from a 1-MW full-scale system test are summarized.

Raad, R.O.; Raphael, H.B. [Statoil, Stavanger (Norway); Henriksen, T. [Norwegian Electric Power Research Inst., Trondheim (Norway); Hadler-Jacobsen, A. [Framo Engineering AS, Nesttun (Norway)

1996-09-01T23:59:59.000Z

129

Kinematics of compressional and extensional ductile shearing deformation in  

Open Energy Info (EERE)

Kinematics of compressional and extensional ductile shearing deformation in Kinematics of compressional and extensional ductile shearing deformation in a metamorphic core complex of the northeastern basin and range Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Kinematics of compressional and extensional ductile shearing deformation in a metamorphic core complex of the northeastern basin and range Details Activities (1) Areas (1) Regions (0) Abstract: Analysis of shear criteria enables the kinematics of two main ductile-shearing events (D1 and D2) to be established in the Raft River, Grouse Creek and Albion 'metamorphic core complex'. The first event (D1) is a NNE-thrusting and corresponds to Mesozoic shortening. A well developed non-coaxial ductile deformation (D2), of Cenozoic age, is marked by the occurrence of opposing eastward (in Raft River) and westward shear

130

REMOTELY CONTROLLED SHEARING OF PIPE AND STRUCTURAL MEMBERS  

SciTech Connect

A shearing tool was developed for remotely controlled severing of pipes or structural members. The shear is rotated about its axis in a wrist motion by the pumped hydraulic fluid that also powers the shear blade. It can be used in a stationary mounting or suspended from a crane. A C-shaped support for the shear was designed to pass through a small top opening of a shielded cell. The controls for manipulating the shear pass through or along the Cframe. The shear jaw opens to 5 in. in height and 7 in. in width, and the total weight of the tool is only 575 lb. It was used to cut metal sections 4 3/4 in. thick and 4-in. sched.-40 stainless steel pipe. (auth)

Abbatiello, A.A.

1961-12-28T23:59:59.000Z

131

Shear at the Base of the Oceanic Mixed Layer Generated by Wind Shear Alignment  

Science Conference Proceedings (OSTI)

Observations are used to evaluate a simple theoretical model for the generation of near-inertial shear spikes at the base of the open ocean mixed layer when the upper ocean displays a two-layer structure. The model predicts that large changes in ...

Liam Brannigan; Yueng-Djern Lenn; Tom P. Rippeth; Elaine McDonagh; Teresa K. Chereskin; Janet Sprintall

2013-08-01T23:59:59.000Z

132

Shear-free gravitational collapse is strongly censored  

E-Print Network (OSTI)

We consider spherically symmetric spacetimes with matter whose timelike flow is assumed to be shear-free. A number of results on the formation and visibility of spacetime singularities is proven, with the main one being that shear-free collapse cannot admit locally naked singularities (which implies absence of globally naked singularities). We conjecture that shear is a necessary condition for the occurrence of locally naked singularities in generic gravitational collapse.

Sergio M. C. V. Goncalves

2003-12-30T23:59:59.000Z

133

Low-n shear Alfven spectra in axisymmetric toroidal plasmas  

SciTech Connect

In toroidal plasmas, the toroidal magnetic field is nonuniform over a magnetic surface and causes coupling of different poloidal harmonics. It is shown both analytically and numerically that the toroidicity not only breaks up the shear Alfven continuous spectrum, but also creates new, discrete, toroidicity-induced shear Alfven eigenmodes with frequencies inside the continuum gaps. Potential applications of the low-n toroidicity-induced shear Alfven eigenmodes on plasma heating and instabilities are addressed. 17 refs., 4 figs.

Cheng, C.Z.; Chance, M.S.

1985-11-01T23:59:59.000Z

134

Shear Viscosity in a CFL Quark Star  

E-Print Network (OSTI)

We compute the mean free path and shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T, when the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL quark matter displays superfluid properties, and transport phenomena in such cold regime are dominated by phonon-phonon scattering. We study superfluid phonons within thermal field theory and compute the mean free path associated to their most relevant collision processes. Small-angle processes turn out to be more efficient in slowing transport phenomena in the CFL matter, while the mean free path relevant for the shear viscosity is less sensitive to collinear scattering due to the presence of zero modes in the Boltzmann equation. In analogy with superfluid He4, we find the same T power law for the superfluid phonon damping rate and mean free path. Our results are relevant for the study of rotational properties of compact stars, and correct wrong estimates existing in the literature.

Cristina Manuel; Antonio Dobado; Felipe J. Llanes-Estrada

2004-06-04T23:59:59.000Z

135

Shear Viscosity Coefficient from Microscopic Models  

E-Print Network (OSTI)

The transport coefficient of shear viscosity is studied for a hadron matter through microscopic transport model, the Ultra--relativistic Quantum Molecular Dynamics (UrQMD), using the Green--Kubo formulas. Molecular--dynamical simulations are performed for a system of light mesons in a box with periodic boundary conditions. Starting from an initial state composed of $\\pi, \\eta ,\\omega ,\\rho ,\\phi$ with a uniform phase--space distribution, the evolution takes place through elastic collisions, production and annihilation. The system approaches a stationary state of mesons and their resonances, which is characterized by common temperature. After equilibration, thermodynamic quantities such as the energy density, particle density, and pressure are calculated. From such an equilibrated state the shear viscosity coefficient is calculated from the fluctuations of stress tensor around equilibrium using Green--Kubo relations. We do our simulations here at zero net baryon density so that the equilibration times depend on the energy density. We do not include hadron strings as degrees of freedom so as to maintain detailed balance. Hence we do not get the saturation of temperature but this leads to longer equilibration times.

Azwinndini Muronga

2003-09-22T23:59:59.000Z

136

Going beyond 2D: following membrane diffusion and topography in the IgE-Fc[epsilon]RI system using 3-dimensional tracking microscopy  

Science Conference Proceedings (OSTI)

The ability to follow and observe single molecules as they function in live cells would represent a major milestone for molecular-cellular biology. Here we present a tracking microscope that is able to track quantum dots in 3 dimensions and simultaneously record time-resolved emission statistics from a single dot. This innovative microscopy approach is based on four spatial filters and closed loop feedback to constantly keep a single quantum dot in the focal spot. Using this microscope, we demonstrate the ability to follow quantum dot-labeled IgE antibodies bound to Fc{epsilon}Rl membrane receptors in live RBL-2H3 cells. The results are consistent with prior studies of 2 dimensional membrane diffusion (Andrews et al., Nat. Cell Biol., 10, 955, 2008). In addition, the microscope captures motion in the axial (Z) direction, which permits tracking of diffusing receptors relative the 'hills and valley' of the dynamically changing membrane landscape. Our novel approach is uniquely capable of following single-molecule dynamics on live cells with 3 dimensional spatial resolution.

Wells, Nathan P [Los Alamos National Laboratory; Lessard, Guillaume A [Los Alamos National Laboratory; Phipps, Marry E [Los Alamos National Laboratory; Goodwin, Peter M [Los Alamos National Laboratory; Werner, James H [Los Alamos National Laboratory; Lidke, Diane S [UNM; Wilson, Bridget S [UNM

2008-01-01T23:59:59.000Z

137

Investigation of a Hybrid Cutting Tool Design for Shearing ...  

Science Conference Proceedings (OSTI)

Presentation Title, Investigation of a Hybrid Cutting Tool Design for Shearing Operations of ... Challenges in Applying Diamond Coatings to Carbide Twist Drills.

138

Aerosol penetration through a seismically loaded shear wall  

SciTech Connect

An experimental study was performed to measure the aerosol penetration through a reinforced concrete shear wall after simulated seismic damage. Static load-cycle testing, to stress levels sufficient to induce visible shear cracking, was used to simulate the earthquake loading. Air permeability tests were performed both before and after the simulated seismic loading damaged the structure. Aerosol penetration measurements were conducted on the cracked shear wall structure using 0.10 {mu}m monodisperse particles. The measured aerosol number penetration through the cracked shear wall was 0.5%. 7 refs.

Farrar, C.R.; Girrens, S.P.

1992-01-01T23:59:59.000Z

139

Aerosol penetration through a seismically loaded shear wall  

SciTech Connect

An experimental study was performed to measure the aerosol penetration through a reinforced concrete shear wall after simulated seismic damage. Static load-cycle testing, to stress levels sufficient to induce visible shear cracking, was used to simulate the earthquake loading. Air permeability tests were performed both before and after the simulated seismic loading damaged the structure. Aerosol penetration measurements were conducted on the cracked shear wall structure using 0.10 {mu}m monodisperse particles. The measured aerosol number penetration through the cracked shear wall was 0.5%. 7 refs.

Farrar, C.R.; Girrens, S.P.

1992-05-01T23:59:59.000Z

140

Orientation selection in lamellar phases by oscillatory shears  

E-Print Network (OSTI)

In order to address the selection mechanism that is responsible for the unique lamellar orientation observed in block copolymers under oscillatory shears, we use a constitutive law for the dissipative part of the stress tensor that respects the uniaxial symmetry of a lamellar phase. An interface separating two domains oriented parallel and perpendicular to the shear is shown to be hydrodynamically unstable, a situation analogous to the thin layer instability of stratified fluids under shear. The resulting secondary flows break the degeneracy between parallel and perpendicular lamellar orientation, leading to a preferred perpendicular orientation in certain ranges of parameters of the polymer and of the shear.

Zhi-Feng Huang; Jorge Vinals

2006-01-17T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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.
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141

Shear-induced metastable states of end-grafted polystyrene  

Science Conference Proceedings (OSTI)

The in situ molecular scale response of end-grafted polystyrene to shear against a deuterated polystyrene melt was investigated with neutron reflectometry. The derived grafted polystyrene density profiles showed that the grafted polystyrene was retained on the quartz wafer during the measurements. The profiles suggested that the end-grafted polystyrene response to shear results in a series of metastable states, rather than equilibrium states assumed in the current theory. Except for some possible extension and/or contraction of the grafted polystyrene with shear, there was no obvious correlation between the grafted polymer structure and the shear thinning behavior observed in these samples.

Sasa, Leslie A. [Los Alamos Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, California 90095 (United States); Yearley, Eric J.; Jablin, Michael S.; Majewski, Jaroslaw; Hjelm, Rex P. [Los Alamos Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Gilbertson, Robert D. [Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Lavine, Adrienne S. [Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, California 90095 (United States)

2011-08-15T23:59:59.000Z

142

Nanocrystallization in a shear band: An in situ investigation  

Science Conference Proceedings (OSTI)

Preferential nanocrystal formation in shear bands that occurred upon applying a tensile strain on an Al-rich metallic glass has been analyzed in situ in a transmission electron microscope as a function of time after the shear band initiation and as a function of local heating. The results indicate the presence of a transient period before nanocrystal formation sets in, as well as the necessity of thermal activation and further show that nanocrystals developed only within the shear bands. These results support models that explain nanocrystal formation in shear bands based on an increased local mobility.

Wilde, G.; Roesner, H. [Institute of Materials Physics, University of Muenster, Wilhelm-Klemm-Str. 10, 48149 Muenster (Germany)

2011-06-20T23:59:59.000Z

143

Ocean tide energy converter having improved efficiency  

Science Conference Proceedings (OSTI)

A tide motor useful for converting periodic rising and falling water levels to useful work such as electric power generation includes a primary piston having a large enclosed chamber that can selectively be filled with air for generation of upward thrust when submerged in rising tidal water or filled with water for generating downward gravitational thrust when the piston is suspended in air above a dropping tidal water level. Cyclic filling and emptying of the chamber is programmed to coordinate piston positions and water level positions, and the piston can be locked in either up or down position to achieve maximum flotation and gravitational thrust forces. An auxiliary tidal piston that can be locked in a down position has an upper water chamber provided with flood valves and an air filled, sealed flotation chamber below. The auxiliary piston is located near the primary piston, and is designed to have positive buoyancy when its respective chambers are filled with water and air. The lower area of the water chamber of the auxiliary piston is connected to the lower area of the primary piston chamber by a valve conduit so the primary piston chamber can be filled with water at its high position while it is locked up by releasing the auxiliary piston to float upwardly with its water chamber filled, and placing the primary and auxiliary piston chambers in communication with each other so water flows from the latter into the former until the primary piston chamber is filled with water before it begins its downward stroke after the water level has dropped below it. After the primary piston has completed its downward stroke, its interior chamber is drained and sealed in preparation for its next upward stroke on the next rising tide, and the water chamber of the auxiliary piston is refilled in preparation for the next cycle of operation.

Rainey, D.E.

1980-01-29T23:59:59.000Z

144

Converting hard copy documents for electronic dissemination  

SciTech Connect

Since the advent of computer systems, the goal of a paperless office, and even a paperless society, has been pursued. While the normal paper flow in an organization is far from totally automated, particularly for items requiring signatures or authorizations, electronic information dissemination is becoming an almost simple task. The reasons for providing on-line documents are many and include faster and easier access for everyone, elimination of printing costs, reduction of wasted shelf and desk space, and the security of having a centrally-located, always up-to-date document. New computer software even provides the user with the ability to annotate documents and to have bookmarks so that the old scribbled-in and dog-eared manual can be replaced without loosing this `customizability`. Moreover, new hypermedia capabilities mean that documents can be read in a non-linear fashion and can include color figures and photographs, audio, and even animation sequences, capabilities which exceed those of paper. The proliferation of network-based information servers, coupled with the growth of the Internet, has enticed academic, governmental, and even commercial organizations to provide increasing numbers of documents and data bases in electronic form via the network, not just to internal staff, but to the public as well. Much of this information, which includes everything from mundane company procedures to spiffy marketing brochures, was previously published only in hard copy. Converting existing documents to electronic form and producing only electronic versions of new documents poses some interesting challenges to the maintainer or author.

Hoffman, F.

1994-12-31T23:59:59.000Z

145

Radio Interference From HVDC Converter Stations, Modeling and Characterization  

Science Conference Proceedings (OSTI)

High-voltage direct-current converter stations generate electromagnetic interference (EMI) that can affect the performance of nearby electronic equipment. A prototype computer program that calculates EMI characteristics in the 5-500-kHz range will enable utility engineers to determine the extent of such interference during the design stage of a converter station.

1986-12-16T23:59:59.000Z

146

Adaptive decentralised control of parallel DC-DC converter systems  

Science Conference Proceedings (OSTI)

In this paper, we develop a robust controller for parallel DC-DC converter system by combining the adaptive backstepping technique and decentralised control. The voltages and currents of all converters are coupled with each other. The parallel DC-DC ...

Jing Zhou

2012-08-01T23:59:59.000Z

147

Learning/teaching graphical user interface based power electronic converters  

Science Conference Proceedings (OSTI)

This paper presents an intuitive graphical user interface for simulation of various topologies of power electronic converters. The simulator is developed using the GUIDE tool of MATLAB®, which acts as a front-end interface that can be ... Keywords: MATLAB®/SIMULINK®, converter design, power electronics teaching tool

S. Doolla; T. S. Bhatti

2006-01-01T23:59:59.000Z

148

The frequency dependent impedance of an HVdc converter  

Science Conference Proceedings (OSTI)

A linear and direct method of determining the frequency dependent impedance of a 12 pulse HVdc converter is presented. Terms are developed for both the dc and ac side impedances of the converter, including the effect of the firing angle control system, the commutation period, and the variability of the commutation period. The impedance predictions are verified by dynamic simulation.

Wood, A.R.; Arrillaga, J. [Univ. of Canterbury, Christchurch (New Zealand)

1995-07-01T23:59:59.000Z

149

Magnet Technology for Power Converters: Nanocomposite Magnet Technology for High Frequency MW-Scale Power Converters  

Science Conference Proceedings (OSTI)

Solar ADEPT Project: CMU is developing a new nanoscale magnetic material that will reduce the size, weight, and cost of utility-scale PV solar power conversion systems that connect directly to the grid. Power converters are required to turn the energy that solar power systems create into useable energy for the grid. The power conversion systems made with CMU’s nanoscale magnetic material have the potential to be 150 times lighter and significantly smaller than conventional power conversion systems that produce similar amounts of power.

None

2012-02-27T23:59:59.000Z

150

MHK Technologies/The DEXAWAVE wave energy converter | Open Energy  

Open Energy Info (EERE)

DEXAWAVE wave energy converter DEXAWAVE wave energy converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage The DEXAWAVE wave energy converter.jpg Technology Profile Primary Organization Dexawave Technology Readiness Level Click here TRL 7 8 Open Water System Testing Demonstration and Operation Technology Description The DEXAWAVE wave energy converter has a simple construction It consists of two rigid pontoons hinged together using a patented hinge The one pontoon can pivot relative to the other There is a hydraulic power take off system on top of the converter generating up to 250 kW Technology Dimensions Technology Nameplate Capacity (MW) 25 Device Testing Scale Test *At present our 1 to 5 scale model is working the waters outside the Danish port of Hanstholm collecting valuable data about the waves and currents that are constantly pounding the structure

151

State Energy Program Helping Arkansans Convert to Compressed Natural Gas |  

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

State Energy Program Helping Arkansans Convert to Compressed State Energy Program Helping Arkansans Convert to Compressed Natural Gas State Energy Program Helping Arkansans Convert to Compressed Natural Gas January 25, 2012 - 4:30pm Addthis The Arkansas Energy Office recently launched a Compressed Natural Gas Conversion Rebate Program, which provides incentives for fleets and individuals to purchase and/or convert their Arkansas-licensed vehicles to compressed natural gas (CNG). | All Rights Reserved. The Arkansas Energy Office recently launched a Compressed Natural Gas Conversion Rebate Program, which provides incentives for fleets and individuals to purchase and/or convert their Arkansas-licensed vehicles to compressed natural gas (CNG). | All Rights Reserved. Grayson Bryant Project Officer -- State Energy Program

152

MHK Technologies/Magnetohydrodynamic MHD Wave Energy Converter MWEC | Open  

Open Energy Info (EERE)

Magnetohydrodynamic MHD Wave Energy Converter MWEC Magnetohydrodynamic MHD Wave Energy Converter MWEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Magnetohydrodynamic MHD Wave Energy Converter MWEC.jpg Technology Profile Primary Organization Scientific Applications Research Associates Inc SARA Technology Resource Click here Wave Technology Type Click here Point Absorber - Submerged Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description The Magnetohydrodynamic MHD Wave Energy Converter couples the up down motion of heave based systems A shaft transfers wave motion to the MHD generator which is deep underwater The shaft forces the conducting fluid through a set of powerful permanent magnets creating a low voltage high current electrical energy An electrical inverter converts the electrical energy to commercial quality 60 Hz AC power

153

A computer program for HVDC converter station RF noise calculations  

SciTech Connect

HVDC converter station operations generate radio frequency (RF) electromagnetic (EM) noise which could interfere with adjacent communication and computer equipment, and carrier system operations. A generic Radio Frequency Computer Analysis Program (RAFCAP) for calculating the EM noise generated by valve ignition of a converter station has been developed as part of a larger project. The program calculates RF voltages, currents, complex power, ground level electric field strength and magnetic flux density in and around an HVDC converter station. The program requires the converter station network to be represented by frequency dependent impedance functions. Comparisons of calculated and measured values are given for an actual HVDC station to illustrate the validity of the program. RAFCAP is designed to be used by engineers for the purpose of calculating the RF noise produced by the igniting of HVDC converter valves.

Kasten, D.G.; Caldecott, R.; Sebo, S.A. (Ohio State Univ., Columbus, OH (United States). Dept. of Electrical Engineering); Liu, Y. (Virginia Polytechnic Inst. State Univ., Blacksburg, VA (United States). Bradley Dept. of Electrical Engineering)

1994-04-01T23:59:59.000Z

154

A study of Schwarz converters for nuclear powered spacecraft  

DOE Green Energy (OSTI)

High power space systems which use low dc voltage, high current sources such as thermoelectric generators, will most likely require high voltage conversion for transmission purposes. This study considers the use of the Schwarz resonant converter for use as the basic building block to accomplish this low-to-high voltage conversion for either a dc or an ac spacecraft bus. The Schwarz converter has the important assets of both inherent fault tolerance and resonant operation and parallel operation in modular form is possible. A regulated dc spacecraft bus requires only a single stage converter while a constant frequency ac bus requires a cascaded Schwarz converter configuration. If the power system requires constant output power from the dc generator, then a second converter is required to route unneeded power to a ballast load.

Stuart, T.A. [Univ. of Toledo, OH (United States); Schwarze, G.E. [Lewis Research Center, Cleveland, OH (United States)

1994-09-01T23:59:59.000Z

155

The SDSS Coadd: Cosmic Shear Measurement  

Science Conference Proceedings (OSTI)

Stripe 82 in the Sloan Digital Sky Survey was observed multiple times, allowing deeper images to be constructed by coadding the data. Here we analyze the ellipticities of background galaxies in this 275 square degree region, searching for evidence of distortions due to cosmic shear. The E-mode is detected in both real and Fourier space with > 5-{sigma} significance on degree scales, while the B-mode is consistent with zero as expected. The amplitude of the signal constrains the combination of the matter density {Omega}{sub m} and fluctuation amplitude {sigma}{sub 8} to be {Omega}{sub m}{sup 0.7} {sigma}{sub 8} = 0.276{sub -0.050}{sup +0.036}.

Lin, Huan; /Fermilab; Dodelson, Scott; /Fermilab /Chicago U., EFI /Chicago U., KICP; Seo, Hee-Jong; /UC, Berkeley; Soares-Santos, Marcelle; /Fermilab; Annis, James; /Fermilab; Hao, Jiangang; /Fermilab; Johnston, David; /Fermilab; Kubo, Jeffrey M.; /Fermilab; Reis, Ribamar R.R.; /Fermilab /Rio de Janeiro Federal U.; Simet, Melanie; /Chicago U., EFI /Chicago U., KICP

2011-11-01T23:59:59.000Z

156

Adjustable shear stress erosion and transport flume  

DOE Patents (OSTI)

A method and apparatus for measuring the total erosion rate and downstream transport of suspended and bedload sediments using an adjustable shear stress erosion and transport (ASSET) flume with a variable-depth sediment core sample. Water is forced past a variable-depth sediment core sample in a closed channel, eroding sediments, and introducing suspended and bedload sediments into the flow stream. The core sample is continuously pushed into the flow stream, while keeping the surface level with the bottom of the channel. Eroded bedload sediments are transported downstream and then gravitationally separated from the flow stream into one or more quiescent traps. The captured bedload sediments (particles and aggregates) are weighed and compared to the total mass of sediment eroded, and also to the concentration of sediments suspended in the flow stream.

Roberts, Jesse D. (Carlsbad, NM); Jepsen, Richard A. (Carlsbad, NM)

2002-01-01T23:59:59.000Z

157

Accuracy of Real-time Couch Tracking During 3-dimensional Conformal Radiation Therapy, Intensity Modulated Radiation Therapy, and Volumetric Modulated Arc Therapy for Prostate Cancer  

SciTech Connect

Purpose: To evaluate the accuracy of real-time couch tracking for prostate cancer. Methods and Materials: Intrafractional motion trajectories of 15 prostate cancer patients were the basis for this phantom study; prostate motion had been monitored with the Calypso System. An industrial robot moved a phantom along these trajectories, motion was detected via an infrared camera system, and the robotic HexaPOD couch was used for real-time counter-steering. Residual phantom motion during real-time tracking was measured with the infrared camera system. Film dosimetry was performed during delivery of 3-dimensional conformal radiation therapy (3D-CRT), step-and-shoot intensity modulated radiation therapy (IMRT), and volumetric modulated arc therapy (VMAT). Results: Motion of the prostate was largest in the anterior-posterior direction, with systematic ( N-Ary-Summation ) and random ({sigma}) errors of 2.3 mm and 2.9 mm, respectively; the prostate was outside a threshold of 5 mm (3D vector) for 25.0%{+-}19.8% of treatment time. Real-time tracking reduced prostate motion to N-Ary-Summation =0.01 mm and {sigma} = 0.55 mm in the anterior-posterior direction; the prostate remained within a 1-mm and 5-mm threshold for 93.9%{+-}4.6% and 99.7%{+-}0.4% of the time, respectively. Without real-time tracking, pass rates based on a {gamma} index of 2%/2 mm in film dosimetry ranged between 66% and 72% for 3D-CRT, IMRT, and VMAT, on average. Real-time tracking increased pass rates to minimum 98% on average for 3D-CRT, IMRT, and VMAT. Conclusions: Real-time couch tracking resulted in submillimeter accuracy for prostate cancer, which transferred into high dosimetric accuracy independently of whether 3D-CRT, IMRT, or VMAT was used.

Wilbert, Juergen; Baier, Kurt [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany)] [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany); Hermann, Christian [Department of Computer Sciences VII, Robotics, and Telematics, University of Wuerzburg, Wuerzburg (Germany)] [Department of Computer Sciences VII, Robotics, and Telematics, University of Wuerzburg, Wuerzburg (Germany); Flentje, Michael [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany)] [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany); Guckenberger, Matthias, E-mail: guckenberger_m@klinik.uni-wuerzburg.de [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany)] [Department of Radiation Oncology, University of Wuerzburg, Wuerzburg (Germany)

2013-01-01T23:59:59.000Z

158

Impact of Gemcitabine Chemotherapy and 3-Dimensional Conformal Radiation Therapy/5-Fluorouracil on Quality of Life of Patients Managed for Pancreatic Cancer  

Science Conference Proceedings (OSTI)

Purpose: To report quality of life (QOL) results for patients receiving chemoradiation therapy for pancreatic cancer. Methods and Materials: Eligible patients (n=41 locally advanced, n=22 postsurgery) entered the B9E-AY-S168 study and received 1 cycle of induction gemcitabine (1000 mg/m{sup 2} weekly Multiplication-Sign 3 with 1-week break) followed by 3-dimensional conformal radiation therapy (RT) (54 Gy locally advanced and 45 Gy postsurgery) and concomitant continuous-infusion 5-fluorouracil (5FU) (200 mg/m{sup 2}/d throughout RT). After 4 weeks, patients received an additional 3 cycles of consolidation gemcitabine chemotherapy. Patients completed the European Organization for Research and Treatment of Cancer QLQ-C30 and QLQ-PAN26 questionnaires at baseline, before RT/5FU, at end of RT/5FU, before consolidation gemcitabine, and at treatment completion. Results: The patterns of change in global QOL scores differed between groups. In the locally advanced group global QOL scores were +13, +8, +3, and +1 compared with baseline before RT/5FU (P=.008), at end of RT/5FU, before consolidation gemcitabine, and at treatment completion, respectively. In the postsurgery group, global QOL scores were -3, +4, +15, and +17 compared with baseline at the same time points, with a significant improvement in global QOL before consolidation gemcitabine (P=.03). No significant declines in global QOL were reported by either cohort. Conclusions: This study demonstrates that global QOL and associated function and symptom profiles for pancreatic chemoradiation therapy differ between locally advanced and postsurgery patients, likely owing to differences in underlying disease status. For both groups, the treatment protocol was well tolerated and did not have a negative impact on patients' global QOL.

Short, Michala [Discipline of Medical Radiation Sciences, University of Sydney, Sydney, New South Wales (Australia) [Discipline of Medical Radiation Sciences, University of Sydney, Sydney, New South Wales (Australia); Western Australia Centre for Cancer and Palliative Care/Curtin Health Innovation Research Institute, Curtin University, Perth, Western Australia (Australia); Goldstein, David [Department of Medical Oncology, Prince of Wales Hospital, Sydney, New South Wales (Australia)] [Department of Medical Oncology, Prince of Wales Hospital, Sydney, New South Wales (Australia); Halkett, Georgia [Western Australia Centre for Cancer and Palliative Care/Curtin Health Innovation Research Institute, Curtin University, Perth, Western Australia (Australia)] [Western Australia Centre for Cancer and Palliative Care/Curtin Health Innovation Research Institute, Curtin University, Perth, Western Australia (Australia); Reece, William [Covance Asia Pacific, Sydney, New South Wales (Australia)] [Covance Asia Pacific, Sydney, New South Wales (Australia); Borg, Martin [Adelaide Radiotherapy Centre, Adelaide, South Australia (Australia)] [Adelaide Radiotherapy Centre, Adelaide, South Australia (Australia); Zissiadis, Yvonne [Department of Radiation Oncology, Royal Perth Hospital, Perth, Western Australia (Australia)] [Department of Radiation Oncology, Royal Perth Hospital, Perth, Western Australia (Australia); Kneebone, Andrew [Northern Sydney Cancer Centre, Royal North Shore Hospital, Sydney, New South Wales (Australia)] [Northern Sydney Cancer Centre, Royal North Shore Hospital, Sydney, New South Wales (Australia); Spry, Nigel, E-mail: Nigel.Spry@health.wa.gov.au [Department of Radiation Oncology, Sir Charles Gairdner Hospital, Perth, Western Australia (Australia) [Department of Radiation Oncology, Sir Charles Gairdner Hospital, Perth, Western Australia (Australia); Faculty of Medicine, University of Western Australia, Perth, Western Australia (Australia)

2013-01-01T23:59:59.000Z

159

Explicit finite element analysis of lightly reinforced masonry shear walls  

Science Conference Proceedings (OSTI)

Explicit finite element analysis (FEA) of masonry shear walls containing reinforcement at spacing between 800mm and 2000mm, referred to as wide spaced reinforced masonry (WSRM), are modelled using macroscopic material characteristics for the unreinforced ... Keywords: Characteristic length, Ductility, Explicit finite element method, Failure mode, Masonry shear walls: Reinforced masonry, Quasi-static modelling

M. Dhanasekar; W. Haider

2008-01-01T23:59:59.000Z

160

The Shear Layer above and in Urban Canopies  

Science Conference Proceedings (OSTI)

The nature and role of the shear layer, which occurs at the level of the average building height in urban canopies, are poorly understood. Velocity data are analyzed to determine the characteristics of the shear layer of the urban canopy, defined ...

Pablo Huq; Louis A. White; Alejandro Carrillo; Jose Redondo; Seshu Dharmavaram; Steven R. Hanna

2007-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Progressive collapse simulation of precast panel shear walls during earthquakes  

Science Conference Proceedings (OSTI)

A distinct element method (DEM) program is modified to model precast panel shear walls. The influence of collapse time t"0 of local failure of a panel is presented. Integrity analyses of a twelve-storey, three-bay precast panel shear wall in different ... Keywords: Concrete panels, Distinct element method, Earthquakes, Failure process simulation, Progressive collapse

O. A. Pekau; Yuzhu Cui

2006-01-01T23:59:59.000Z

162

Wind Shear Characteristics at Central Plains Tall Towers (presentation)  

SciTech Connect

The objectives of this report are: (1) Analyze wind shear characteristics at tall tower sites for diverse areas in the central plains (Texas to North Dakota)--Turbines hub heights are now 70-100 m above ground and Wind measurements at 70-100+ m have been rare. (2) Present conclusions about wind shear characteristics for prime wind energy development regions.

Schwartz, M.; Elliott, D.

2006-06-05T23:59:59.000Z

163

Fission converter heat removal and safety under accident conditions  

Science Conference Proceedings (OSTI)

The design and safety of the heat removal system of the Massachusetts Institute of Technology (MIT) design for a fission converter-based epithermal beam is discussed in this paper. Plate-type reactor fuel elements, used in the MIT research reactor (MITR-II), are also used for the fission converter. This fission converter-based beam provides epithermal neutron fluxes at the patient position in excess of 10{sup 10} n/cm{sup 2}s with very low contamination of fast neutrons and gamma rays.

Sutharshan, B.; Todreas, N.E.; Harling, O.K. [Massachusetts Inst. of Technology, Cambridge, MA (United States)

1996-12-31T23:59:59.000Z

164

Prediction of core saturation instability at an HVDC converter  

SciTech Connect

Core saturation instability has occurred on several HVDC schemes resulting from interactions between second harmonic and dc quantities (voltages and currents) on the ac side of the converter and fundamental frequency quantities on the dc side of the converter. The instability can be reinforced by unbalanced saturation of the converter transformers. The paper presents an analytical method which can be used to quickly screen ac and dc system operating conditions to predict where core saturation instability is likely to occur. Analytical results have been confirmed using the digital transients simulation program PSCAD/EMTDC.

Burton, R.S. [Teshmont Consultants, Inc., Winnipeg, Manitoba (Canada); Fuchshuber, C.F. [Alberta Power Ltd., Edmonton, Alberta (Canada); Woodford, D.A. [Manitoba HVDC Research Centre, Winnipeg, Manitoba (Canada); Gole, A.M. [Univ. of Manitoba, Winnipeg, Manitoba (Canada)

1996-10-01T23:59:59.000Z

165

A prototype ASIC buck converter for LHC upgrades  

E-Print Network (OSTI)

Given the larger number of channels and the need for reduced material budget in the SLHC trackers, alternatives to the present power distribution scheme have to be explored. In this context we are envisaging a new architecture based on custom switching converters able to work in the high radiation and high magnetic field environment of the experiments. A prototype converter has been designed and integrated in an ASIC. This includes the fundamental building blocks of a buck converter that can be used in later and more complete designs and even in different topologies. Design techniques and functional tests of the prototype will be discussed.

Michelis, S; Allongue, B; Blanchot, G; Fuentes, C; Kayal, M

2008-01-01T23:59:59.000Z

166

MHK Technologies/Tunneled Wave Energy Converter TWEC | Open Energy  

Open Energy Info (EERE)

Tunneled Wave Energy Converter TWEC Tunneled Wave Energy Converter TWEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Tunneled Wave Energy Converter TWEC.jpg Technology Profile Primary Organization SeWave Ltd Project(s) where this technology is utilized *MHK Projects/TWEC Project Technology Resource Click here Wave Technology Type Click here Oscillating Water Column Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description The Tunneled Wave Energy Converter TWEC utilizes the OWC principle through its use of a proposed bored out tunnel within a cliff side of the Faroe Islands Technology Dimensions Device Testing Date Submitted 10/8/2010 << Return to the MHK database homepage

167

Converting DOE Technical Standards to Voluntary Consensus Standards...  

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

DOE-TSPP-8-2013 DOE TECHNICAL STANDARDS September 2013 PROGRAM PROCEDURES CONVERTING DOE TECHNICAL STANDARDS TO VOLUNTARY CONSENSUS STANDARDS U.S. Department of Energy Office of...

168

Converting Unconditioned Garage to Conditioned Space - Code Notes |  

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

Converting Unconditioned Garage to Conditioned Space - Code Notes Converting Unconditioned Garage to Conditioned Space - Code Notes Converting an existing unconditioned garage to conditioned space is a popular strategy for increasing the living space of a house. Typically, the conversion or remodeling must be done in compliance with construction codes in force at the time the remodel permit is issued. Compliance shall be demonstrated by meeting the requirements of the 2009 International Energy Conservation Code. Publication Date: Thursday, December 15, 2011 cn_converting_unconditioned_garage_to_conditioned_space.pdf Document Details Document Number: PNNL-SA-83069 Prepared by: Pacific Northwest National Laboratory for the U.S. Department of Energy Building Energy Codes Program Focus: Compliance Building Type: Residential

169

Enterprise converting buses to biodiesel | Department of Energy  

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

Enterprise converting buses to biodiesel Enterprise converting buses to biodiesel Enterprise converting buses to biodiesel April 1, 2010 - 6:48pm Addthis Paul Lester Communications Specialist, Office of Energy Efficiency and Renewable Energy Rental car customers may be able to breathe a little easier during their next trip to the airport. Alamo Rent A Car, Enterprise Rent-A-Car, and National Car Rental, all brands operated by the subsidiaries of Enterprise Holdings, are converting their airport shuttle buses to run on biodiesel fuel. The move is a good one for the environment, and will ultimately reduce the company's carbon emissions. "We are saving 420,000 gallons of petroleum diesel," says Lee Broughton, director of corporate identity and sustainability for Enterprise Holdings. Hydrocarbon and particulate matter emissions will plummet, making the air

170

MHK Technologies/The Crestwing Wave Energy Converter | Open Energy  

Open Energy Info (EERE)

Crestwing Wave Energy Converter Crestwing Wave Energy Converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage The Crestwing Wave Energy Converter.jpg Technology Profile Primary Organization Waveenergyfyn Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 7 8 Open Water System Testing Demonstration and Operation Technology Description The connected pontoons swing around the hinge when the top of the waves passes under the floats The pontoons relative motion is converted into usable energy through a linear PTO system The pontoons are pushed upwards from the below passing wave and again dragged down by the same passing wave Complex hydrodynamic conditions occur under the pontoons when the wave formation pushes the unit up and down simultaneously The energy from waves can be divided into fifty percent potential energy and fifty percent kinetic energy Crestwing absorbs both the potential energy as the kinetic energy which is the back ground for the high efficiency

171

Implementation of control system for hydrokinetic energy converter  

Science Conference Proceedings (OSTI)

At Uppsala University, a research group is investigating a system for converting the power in freely flowing water using a verticalaxis turbine directly connected to a permanent magnet generator. An experimental setup comprising a turbine, a generator, ...

Katarina Yuen, Senad Apelfröjd, Mats Leijon

2013-01-01T23:59:59.000Z

172

Monolithic series-connected gallium arsenide converter development  

DOE Green Energy (OSTI)

We report the development of monolithic GaAs photovoltaic devices intended to convert light generated by a laser or other bright source to electricity. The converters described here can provide higher operating voltage than is possible using a single-junction converter, owing to use of a monolithic circuit that forms a planar series-connected string of single-junction sub-cells. This planar monolithic circuit is arranged to deliver the desired voltage and current during operation at the maximum power point. The paper describes two-, six-, and twelve-junction converters intended for illumination by a laser diode with a wavelength of 0.8 {mu}m. Design and characterization data are presented for optical power in the range of 100 mW to 1 W. The best conversion efficiency exceeds 50%. 9 refs., 4 figs., 2 tabs.

Spitzer, M.B.; McClelland, R.W.; Dingle, B.D.; Dingle, J.E.; Hill, D.S. (Kopin Corp., Taunton, MA (United States)); Rose, B.H. (Sandia National Labs., Albuquerque, NM (United States))

1991-01-01T23:59:59.000Z

173

10-MW GTO converter for battery peaking service  

SciTech Connect

A bidirectional 18-pulse voltage source converter utilizing gate turn-off thyristors (GTO's) is described. The converter, which is rated 10 MVA, was placed in service in early 1988 to connect an energy storage battery to a utility grid. The converter is rated and controlled to operate in all four quadrants (discharge, charge, leading vars, or lagging vars) at the full 10-MVA rating. It is capable of independent rapid control of real and reactive power with a transient response of 16 ms to changes in commanded value of real or reactive power. Thus it is usable as a reactive power controller (static var control), voltage control, frequency control, power system stabilizer, or as a real power peaking station. For use as a reactive power controller only, no battery would be needed. The design, construction, control, and application of the converter are described, and performance data taken at factory power test and at the installation are given.

Walker, L.H. (Drive Development Engineering, Drive Systems, General Electric Co., Salem, VA (US))

1990-01-01T23:59:59.000Z

174

Method for converting uranium oxides to uranium metal  

DOE Green Energy (OSTI)

A process is described for converting scrap and waste uranium oxide to uranium metal. The uranium oxide is sequentially reduced with a suitable reducing agent to a mixture of uranium metal and oxide products. The uranium metal is then converted to uranium hydride and the uranium hydride-containing mixture is then cooled to a temperature less than -100.degree. C. in an inert liquid which renders the uranium hydride ferromagnetic. The uranium hydride is then magnetically separated from the cooled mixture. The separated uranium hydride is readily converted to uranium metal by heating in an inert atmosphere. This process is environmentally acceptable and eliminates the use of hydrogen fluoride as well as the explosive conditions encountered in the previously employed bomb-reduction processes utilized for converting uranium oxides to uranium metal.

Duerksen, Walter K. (Norris, TN)

1988-01-01T23:59:59.000Z

175

step 1: retrieve usage step 2: convert usage  

E-Print Network (OSTI)

planet #12;step 2: convert usage data to ghg electricity conversion EPA eGRID database provides state by state data on: lbs CO2 / MWh lbs NOx / MWH eGRID Massachusetts ­ specific conversion factors only

Paulsson, Johan

176

Method for converting uranium oxides to uranium metal  

DOE Patents (OSTI)

A process is described for converting scrap and waste uranium oxide to uranium metal. The uranium oxide is sequentially reduced with a suitable reducing agent to a mixture of uranium metal and oxide products. The uranium metal is then converted to uranium hydride and the uranium hydride-containing mixtures is then cooled to a temperature less than -100/sup 0/C in an inert liquid which renders the uranium hydride ferromagnetic. The uranium hydride is then magnetically separated from the cooled mixture. The separated uranium hydride is readily converted to uranium metal by heating in an inert atmosphere. This process is environmentally acceptable and eliminates the use of hydrogen fluoride as well as the explosive conditions encountered in the previously employed bomb-reduction processes utilized for converting uranium oxides to uranium metal.

Duerksen, W.K.

1987-01-01T23:59:59.000Z

177

California's program converts biomass residues to energy  

SciTech Connect

This paper provides a brief introduction to the emerging biomass fuel industry in California and includes descriptions of California's biomass potential, California's biomass development program, and legislation that expands the state's developmental efforts in biomass commercialization. California's agriculture and forest industries residues were discussed. These residues can be converted to energy, and now, through California's aggressive development program, more residues will be converted. (DP)

Ward, P.F.

1980-01-01T23:59:59.000Z

178

Propensity Score-based Comparison of Long-term Outcomes With 3-Dimensional Conformal Radiotherapy vs Intensity-Modulated Radiotherapy for Esophageal Cancer  

SciTech Connect

Purpose: Although 3-dimensional conformal radiotherapy (3D-CRT) is the worldwide standard for the treatment of esophageal cancer, intensity modulated radiotherapy (IMRT) improves dose conformality and reduces the radiation exposure to normal tissues. We hypothesized that the dosimetric advantages of IMRT should translate to substantive benefits in clinical outcomes compared with 3D-CRT. Methods and Materials: An analysis was performed of 676 nonrandomized patients (3D-CRT, n=413; IMRT, n=263) with stage Ib-IVa (American Joint Committee on Cancer 2002) esophageal cancers treated with chemoradiotherapy at a single institution from 1998-2008. An inverse probability of treatment weighting and inclusion of propensity score (treatment probability) as a covariate were used to compare overall survival time, interval to local failure, and interval to distant metastasis, while accounting for the effects of other clinically relevant covariates. The propensity scores were estimated using logistic regression analysis. Results: A fitted multivariate inverse probability weighted-adjusted Cox model showed that the overall survival time was significantly associated with several well-known prognostic factors, along with the treatment modality (IMRT vs 3D-CRT, hazard ratio 0.72, P<.001). Compared with IMRT, 3D-CRT patients had a significantly greater risk of dying (72.6% vs 52.9%, inverse probability of treatment weighting, log-rank test, P<.0001) and of locoregional recurrence (P=.0038). No difference was seen in cancer-specific mortality (Gray's test, P=.86) or distant metastasis (P=.99) between the 2 groups. An increased cumulative incidence of cardiac death was seen in the 3D-CRT group (P=.049), but most deaths were undocumented (5-year estimate, 11.7% in 3D-CRT vs 5.4% in IMRT group, Gray's test, P=.0029). Conclusions: Overall survival, locoregional control, and noncancer-related death were significantly better after IMRT than after 3D-CRT. Although these results need confirmation, IMRT should be considered for the treatment of esophageal cancer.

Lin, Steven H., E-mail: SHLin@mdanderson.org [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Wang Lu [Department of Biostatistics, University of Michigan, Ann Arbor, Michigan (United States)] [Department of Biostatistics, University of Michigan, Ann Arbor, Michigan (United States); Myles, Bevan [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Thall, Peter F. [Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Hofstetter, Wayne L.; Swisher, Stephen G. [Department of Thoracic Surgery, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Thoracic Surgery, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Ajani, Jaffer A. [Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Cox, James D.; Komaki, Ritsuko; Liao Zhongxing [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)

2012-12-01T23:59:59.000Z

179

Bi-directional power control system for voltage converter  

DOE Patents (OSTI)

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

Garrigan, Neil Richard (Niskayuna, NY); King, Robert Dean (Schenectady, NY); Schwartz, James Edward (Slingerlands, NY)

1999-01-01T23:59:59.000Z

180

Bi-directional power control system for voltage converter  

DOE Patents (OSTI)

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals. 10 figs.

Garrigan, N.R.; King, R.D.; Schwartz, J.E.

1999-05-11T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Temperature Measurements in Full-Scale Wood Stud Shear Walls  

E-Print Network (OSTI)

This report presents the results of 10 full-scale fire resistance tests conducted at the National Fire Laboratory on load-bearing gypsum board protected, wood stud shear wall assemblies with and without resilient channels on the fire-exposed side. The two assembly arrangements studied were: symmetrical installation 1x1 (one layer of gypsum board on each of the exposed and unexposed sides) and asymmetrical installation of the shear membrane (one layer of gypsum board on both the exposed and unexposed sides and a shear wall membrane as a base layer alternating between the exposed (2x1) and unexposed sides (1x2)) on a wood stud frame. The gypsum board was 12.7 mm thick Type X. The insulations used were glass and rock fibres. The shear membranes used were plywood and oriented strand board (OSB). Tests were conducted to determine the effects of the placement of the shear membrane on the exposed/unexposed face, type of shear membrane, insulation type, load intensity and resilient channel installations on the fire resistance of gypsum board protected, wood stud shear wall assemblies. Details of the results, including the temperatures and deflections measured during the fire tests, are presented. ACKNOWLEDGEMENTS This research is part of a consortium project on the fire resistance and sound performance of wall assemblies - Phase II, among the following partners: . Canadian Wood Council . Canadian Home Builders Association . Canadian Sheet Steel Building Institute . Gypsum Manufacturers of Canada . Owens-Corning Canada . Roxul Inc.

V. K. R. Sultan; M. A. Denham; V. K. R. Kodur; M. A. Sultan; E. M. A. Denham; Canadian Wood Council; Shear Walls; Shear Walls; Shear Walls; Shear Walls

1996-01-01T23:59:59.000Z

182

Velocity shear-induced effects on electrostatic ion perturbations  

Science Conference Proceedings (OSTI)

Linear evolution of electrostatic perturbations in an unmagnetized electron{endash}ion plasma shear flow is studied. New physical effects, arising due to the non-normality of linear dynamics are disclosed. A new class of {ital nonperiodic collective mode} with vortical motion of ions, characterized by intense energy exchange with the mean flow, is found. It is also shown that the velocity shear induces extraction of the mean flow energy by ion-sound waves and that during the shear-induced evolution the ion-sound waves turn eventually into ion plasma oscillations. {copyright} {ital 1997 American Institute of Physics.}

Rogava, A.D. [Department of Physics, Tbilisi State University, and Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia)] [Department of Physics, Tbilisi State University, and Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia); Chagelishvili, G.D. [Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia)] [Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia); [Department of Cosmogeophysics, Space Research Institute, Moscow (Russia); Berezhiani, V.I. [Department of Plasma Physics, Institute of Physics, Tbilisi, Republic of (Georgia)] [Department of Plasma Physics, Institute of Physics, Tbilisi, Republic of (Georgia)

1997-12-01T23:59:59.000Z

183

Flow shear induced Compton scattering of electron drift instability  

SciTech Connect

Plasma flow shear effects on nonlinear saturation of electron drift waves are analyzed in the weak turbulence regime. Flow shear can enhance ion Compton scattering of long wavelength electron drift waves not only by modifying the beat wave-ion resonance condition, but also via the radial dependence of linear susceptibility. A nonlinear dispersion relation is obtained as a solution of the radially nonlocal nonlinear eigenmode equation. At nonlinear saturation, the spectral intensity of the fluctuations scales with flow shear as ({partial derivative}V{var phi}/{partial derivative}r){sup {minus}2} in addition to the linear dependence on the linear growth rate.

Hahm, T.S.

1992-02-01T23:59:59.000Z

184

Flow shear induced Compton scattering of electron drift instability  

Science Conference Proceedings (OSTI)

Plasma flow shear effects on nonlinear saturation of electron drift waves are analyzed in the weak turbulence regime. Flow shear can enhance ion Compton scattering of long wavelength electron drift waves not only by modifying the beat wave-ion resonance condition, but also via the radial dependence of linear susceptibility. A nonlinear dispersion relation is obtained as a solution of the radially nonlocal nonlinear eigenmode equation. At nonlinear saturation, the spectral intensity of the fluctuations scales with flow shear as ({partial_derivative}V{var_phi}/{partial_derivative}r){sup {minus}2} in addition to the linear dependence on the linear growth rate.

Hahm, T.S.

1992-02-01T23:59:59.000Z

185

Integration through transients for Brownian particles under steady shear  

E-Print Network (OSTI)

Abstract. Starting from the microscopic Smoluchowski equation for interacting Brownian particles under stationary shearing, exact expressions for shear– dependent steady–state averages, correlation and structure functions, and susceptibilities are obtained, which take the form of generalized Green–Kubo relations. They require integration of transient dynamics. Equations of motion with memory effects for transient density fluctuation functions are derived from the same microscopic starting point. We argue that the derived formal expressions provide useful starting points for approximations in order to describe the stationary non–equilibrium state of steadily sheared dense colloidal dispersions.

M. Fuchs; M. E. Cates

2005-01-01T23:59:59.000Z

186

Vertical Shearing Instabilities in Radially Shearing Disks: The Dustiest Layers of the Protoplanetary Nebula  

E-Print Network (OSTI)

Gravitational instability of a vertically thin, dusty sheet near the midplane of a protoplanetary disk has long been proposed as a way of forming planetesimals. Before Roche densities can be achieved, however, the dust-rich layer, sandwiched from above and below by more slowly rotating dust-poor gas, threatens to overturn and mix by the Kelvin-Helmholtz instability (KHI). Whether such a threat is real has never been demonstrated: the Richardson criterion for the KHI is derived for 2-D Cartesian shear flow and does not account for rotational forces. Here we present 3-D numerical simulations of gas-dust mixtures in a shearing box, accounting for the full suite of disk-related forces: the Coriolis and centrifugal forces, and radial tidal gravity. Dust particles are assumed small enough to be perfectly entrained in gas; the two fluids share the same velocity field but obey separate continuity equations. We find that the Richardson number Ri does not alone determine stability. The critical value of Ri below which the dust layer overturns and mixes depends on the height-integrated metallicity Z (surface density ratio of dust to gas). Nevertheless, for Z between one and five times solar, the critical Ri is nearly constant at 0.1. Keplerian radial shear stabilizes those modes that would otherwise disrupt the layer at large Ri. If Z is at least 5 times greater than the solar value of 0.01, then midplane dust densities can approach Roche densities. Such an environment might be expected to produce gas giant planets having similarly super-solar metallicities.

E. Chiang

2007-11-28T23:59:59.000Z

187

The Optimal State for Gravity Currents in Shear  

Science Conference Proceedings (OSTI)

This study examines the lifting of sheared environmental air by gravity currents, focusing primarily on the theoretical “optimal state” in which near-surface flow is turned into a vertically oriented jet. Theoretical models are presented from ...

George H. Bryan; Richard Rotunno

188

Wind shear and buoyancy reversal at the stratocumulus top  

Science Conference Proceedings (OSTI)

A numerical experiment is designed to study the interaction at the stratocumulus top between a mean vertical shear and the buoyancy reversal due to evaporative cooling, without radiative cooling. Direct numerical simulation is used to eliminate ...

Juan Pedro Mellado; Bjorn Stevens; Heiko Schmidt

189

Aircraft Low Altitude Wind Shear Detection and Warning System  

Science Conference Proceedings (OSTI)

There is now considerable evidence to substantiate the causal relationship between low altitude wind shear (LAWS) and the recent increase in low-altitude aircraft accidents. The National Research Council has found that for the period 1964 to 1982,...

Peter C. Sinclair; Peter M. Kuhn

1991-01-01T23:59:59.000Z

190

Interface Constraints on Shear Band Patterns in Bonded Metallic ...  

Science Conference Proceedings (OSTI)

All FEM results were analyzed on deformed mesh at maximum load. ... Red curves in Figure 3 (a) and (b) represent the shear band patterns on the top surface of ...

191

The Structure of Idealized Upper-Tropospheric Shear Lines  

Science Conference Proceedings (OSTI)

The structure of idealized two-dimensional shear lines has been calculated for specified tropopause potential temperature anomalies. A cold anomaly corresponds to an intrusion of stratospheric air into the troposphere. A balanced hydrostatic ...

Martin Juckes

1999-08-01T23:59:59.000Z

192

Characterization of geothermal reservoir crack patterns using shear-wave  

Open Energy Info (EERE)

geothermal reservoir crack patterns using shear-wave geothermal reservoir crack patterns using shear-wave splitting Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Characterization of geothermal reservoir crack patterns using shear-wave splitting Details Activities (1) Areas (1) Regions (0) Abstract: Microearthquakes recorded by a downhole, three-component seismic network deployed around the Coso, California, geothermal reservoir since 1992 display distinctive shear-wave splitting and clear polarization directions. From the polarizations the authors estimated three predominant subsurface fracture directions, and from the time delays of the split waves they determined tomographically the 3-D fracture density distribution in the reservoir. Author(s): Lou, M.; Rial, J.A. Published: Geophysics, 3/1/1997

193

Shear-wave splitting and reservoir crack characterization: the Coso  

Open Energy Info (EERE)

Shear-wave splitting and reservoir crack characterization: the Coso Shear-wave splitting and reservoir crack characterization: the Coso geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Shear-wave splitting and reservoir crack characterization: the Coso geothermal field Details Activities (1) Areas (1) Regions (0) Abstract: This paper aims to improve current understanding of the subsurface fracture system in the Coso geothermal field, located in east-central California. The Coso reservoir is in active economic development, so that knowledge of the subsurface fracture system is of vital importance for an accurate evaluation of its geothermal potential and day-to-day production. To detect the geometry and density of fracture systems we applied the shear-wave splitting technique to a large number of

194

Instability of Surface and Upper-Tropospheric Shear Lines  

Science Conference Proceedings (OSTI)

An analytic linear stability analysis is carried out for a shear line associated with a surface temperature anomaly in uniform potential vorticity, quasigeostrophic flow. Previous studies of this type of flow, albeit with more realistic basic ...

Martin Juckes

1995-09-01T23:59:59.000Z

195

Effects of Vertical Wind Shear on Tropical Cyclone Precipitation  

Science Conference Proceedings (OSTI)

The response of the precipitation field for tropical cyclones in relation to the surrounding environmental vertical wind shear has been investigated using 20 000 snapshots of passive-microwave satellite rain rates. Composites of mean rain rates, ...

Matthew T. Wingo; Daniel J. Cecil

2010-03-01T23:59:59.000Z

196

Solar Radiative Transfer for Wind-Sheared Cumulus Cloud Fields  

Science Conference Proceedings (OSTI)

The Monte Carlo method of photon transport was used to simulate solar radiative transfer for cumulus-like cloud forms (and cloud fields) possessing structural characteristics similar to those induced by wind shear. Using regular infinite arrays ...

Howard W. Barker

1994-05-01T23:59:59.000Z

197

Rapidly Intensifying Hurricane Guillermo (1997). Part II: Resilience in Shear  

Science Conference Proceedings (OSTI)

This paper examines the structure and evolution of a mature tropical cyclone in vertical wind shear (VWS) using airborne Doppler radar observations of Hurricane Guillermo (1997). In Part I, the modulation of eyewall convection via the rotation of ...

Paul D. Reasor; Matthew D. Eastin

2012-02-01T23:59:59.000Z

198

Fluid shear-induced hypertrophy in neonatal rat ventricular myocytes  

E-Print Network (OSTI)

32 Figure 1: BNP and ANP Expression relative to GAPDH forNo Shear Ratio for BNP & ANP for Cardiomyocytes on Glass34 Figure 15: BNP and ANP Expression relative to Ef1 for

Fujimura, Atsushi

2009-01-01T23:59:59.000Z

199

Distribution of Helicity, CAPE, and Shear in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The previous study of helicity, CAPE, and shear in Hurricane Bonnie (1998) was extended to all eight tropical cyclones sampled by NASA during the Convection and Moisture Experiments (CAMEX). Storms were categorized as having large or small ...

John Molinari; David Vollaro

2010-01-01T23:59:59.000Z

200

Wind Shear Characteristics at Central Plains Tall Towers: Preprint  

SciTech Connect

Conference paper for WindPower 2006 held June 4-7, 2006, in Pittsburgh, PA, describing the wind shear characteristics at tall tower sites in the Central Plains of the United States.

Schwartz, M.; Elliott, D.

2006-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Eddy Asymmetry in the Sheared Heated Boundary Layer  

Science Conference Proceedings (OSTI)

Statistical measures are developed to study the influence of mean shear on the asymmetry of eddy updrafts as observed from low-level aircraft flights in HAPEX, FIFE, and SESAME. This asymmetry involves formation of microfronts between updrafts ...

L. Mahrt

1991-02-01T23:59:59.000Z

202

Varieties of Fully Resolved Spectra of Vertical Shear  

Science Conference Proceedings (OSTI)

The Multi-Scale profiler (MSP) resolves shear between vertical wavenumbers of 0.01 cpm and the viscous cutoff of small-scale turbulence. Observations from five sites reveal varied spectral shapes and amplitudes. Spectral amplitudes measured at ...

M. C. Gregg; D. P. Winkel; T. B. Sanford

1993-01-01T23:59:59.000Z

203

Shear-wave splitting and reservoir crack characterization: the...  

Open Energy Info (EERE)

of its geothermal potential and day-to-day production. To detect the geometry and density of fracture systems we applied the shear-wave splitting technique to a large number...

204

Analytical Shear Statistics Based on Nocturnal Wind Profiles  

Science Conference Proceedings (OSTI)

For a number of periods since 1978, wind and temperature profile measurements have been taken at two radio masts of 300 m height located in northern Germany. From wind profiles obtained during nocturnal conditions, wind shear data were calculated ...

K-P. Wittich; J. Hartmann; R. Roth

1986-11-01T23:59:59.000Z

205

Simulations of Dual-Vortex Interaction within Environmental Shear  

Science Conference Proceedings (OSTI)

For over a century it has been known that each vortex in a multiple vortex configuration will move in response to the other vortices. However, despite advances since that time, the complexities of multiple vortex scenarios when sheared ...

Robert E. Hart; Jenni L. Evans

1999-11-01T23:59:59.000Z

206

Environmental Vertical Wind Shear with Hurricane Bertha (1996)  

Science Conference Proceedings (OSTI)

Hurricane Bertha (1996) was influenced by vertical wind shear with highly variable direction and magnitude. The paper describes a unique method for determining the vertical tilt of a tropical cyclone vortex using satellite and aircraft data. ...

Raymond M. Zehr

2003-04-01T23:59:59.000Z

207

Numerical method for shear bands in ductile metal with inclusions  

SciTech Connect

A numerical method for mesoscale simulation of high strain-rate loading of ductile metal containing inclusions is described. Because of small-scale inhomogeneities, such a composite material is prone to localized shear deformation (adiabatic shear bands). The modeling framework is the Generalized Method of Cells of Paley and Aboudi [Mech. Materials, vol. 14, pp. /27-139, 1992], which ensures that the micromechanical response of the material is reflected in the behavior of the composite at the mesoscale. To calculate the effective plastic strain rate when shear bands are present, the analytic and numerical analysis of shear bands by Glimm, Plohr, and Sharp [Mech. Materials, vol. 24, pp. 31-41, 1996] is adapted and extended.

Plohr, Jee Yeon N [Los Alamos National Laboratory; Plohr, Bradley J [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

208

Solitary Rossby Waves in the Presence of Vertical Shear  

Science Conference Proceedings (OSTI)

An investigation is made to determine the effects of vertical shear on regular neutral mode Rossby solitons for application to planetary atmospheres. The basic zonal flow consists of two fluid layers on a ?plane, each with different mean ...

P. D. Weidman; L. G. Redekopp

1980-10-01T23:59:59.000Z

209

Finescale Instabilities of the Double-Diffusive Shear Flow  

Science Conference Proceedings (OSTI)

This study examines dynamics of finescale instabilities in thermohaline–shear flows. It is shown that the presence of the background diapycnal temperature and salinity fluxes due to double diffusion has a destabilizing effect on the basic ...

Timour Radko; Melvin E. Stern

2011-03-01T23:59:59.000Z

210

A new multi-motor drive system based on two-stage direct power converter.  

E-Print Network (OSTI)

??The two-stage AC to AC direct power converter is an alternative matrix converter topology, which offers the benefits of sinusoidal input currents and output voltages,… (more)

Kumar, Dinesh

2011-01-01T23:59:59.000Z

211

Modeling, Analysis and Stabilization of Converter-Dominated Power Distribution Grids.  

E-Print Network (OSTI)

??The energy sector is moving towards extensive use of power electronic (PE) converters to interface distributed generation (DG) units and modern converter-interfaced loads (CILs). Therefore,… (more)

Radwan, Amr A A

2012-01-01T23:59:59.000Z

212

Anomalous transport due to shear-Alfven waves  

SciTech Connect

The behavior of shear-Alfven eigenmodes and the accompanied anomalous transport have been investigated. In the particle simulation, equilibrium thermal fluctuations associated with the eigenmodes have been observed to nullify the zeroth-order shear near the rational surface through the induced second-order eddy current, and, in turn, give rise to the formation of magnetic islands which cause rapid electron energy transport in the region. The theoretical verification of the observed behavior is discussed.

Lee, W.W.; Chance, M.S.; Okuda, H.

1980-10-01T23:59:59.000Z

213

Isotropic singularities in shear-free perfect fluid cosmologies  

E-Print Network (OSTI)

We investigate barotropic perfect fluid cosmologies which admit an isotropic singularity. From the General Vorticity Result of Scott, it is known that these cosmologies must be irrotational. In this paper we prove, using two different methods, that if we make the additional assumption that the perfect fluid is shear-free, then the fluid flow must be geodesic. This then implies that the only shear-free, barotropic, perfect fluid cosmologies which admit an isotropic singularity are the FRW models.

Geoffery Ericksson; Susan M. Scott

2001-08-02T23:59:59.000Z

214

Supercooled Liquid Dynamics Studied via Shear-Mechanical Spectroscopy  

E-Print Network (OSTI)

We report dynamical shear-modulus measurements for five glass-forming liquids (pentaphenyl trimethyl trisiloxane, diethyl phthalate, dibutyl phthalate, 1,2-propanediol, and m-touluidine). The shear-mechanical spectra are obtained by the piezoelectric shear-modulus gauge (PSG) method. This technique allows one to measure the shear modulus ($10^{5} -10^{10}$ Pa) of the liquid within a frequency range from 1 mHz to 10 kHz. We analyze the frequency-dependent response functions to investigate whether time-temperature superposition (TTS) is obeyed. We also study the shear-modulus loss-peak position and its high-frequency part. It has been suggested that when TTS applies, the high-frequency side of the imaginary part of the dielectric response decreases like a power law of the frequency with an exponent -1/2. This conjecture is analyzed on the basis of the shear mechanical data. We find that TTS is obeyed for pentaphenyl trimethyl trisiloxane and in 1,2-propanediol while in the remaining liquids evidence of a mechanical $\\beta$ process is found. Although the the high-frequency power law behavior $\\omega^{-\\alpha}$ of the shear-loss may approach a limiting value of $\\alpha=0.5$ when lowering the temperature, we find that the exponent lies systematically above this value (around 0.4). For the two liquids without beta relaxation (pentaphenyl trimethyl trisiloxane and 1,2-propanediol) we also test the shoving model prediction, according to which the the relaxation-time activation energy is proportional to the instantaneous shear modulus. We find that the data are well described by this model.

Claudio Maggi; Bo Jakobsen; Tage Christensen; N. B. Olsen; Jeppe C. Dyre

2008-06-09T23:59:59.000Z

215

Nonlinear FE analysis of cracks in tension and shear  

E-Print Network (OSTI)

t t U nl oa di ng k tt R el oa di ng Fig. 5. Shear unloading and reloading model 5 4 3 2 1 0 #3;1 #3;2 #3;3 #3;4 #3;5 #3;6 Strain #3;0·010 #3;0·005 0·000 0·005 0·010 S tre ss : N /m m 2 Fig. 6. Shear loading, unloading and reloading model Kesse and Lees...

Kesse, G.; Lees, Janet M.

2007-05-01T23:59:59.000Z

216

MHK Technologies/Tide Current Converter | Open Energy Information  

Open Energy Info (EERE)

Tide Current Converter Tide Current Converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Tide Current Converter.jpg Technology Profile Primary Organization Neptune Systems Technology Resource Click here Current Technology Type Click here Oscillating Wave Surge Converter Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The Tide Current Converter is based on the direct interaction between a magnetic electric and fluid flow field when a conductive fluid moves through a magnetic field electrical power is generated directly inside the fluid volume In this marine application the sea water itself is the conductive fluid A static antenna like structure generates the magnetic fields and at the same time taps the electrical power from the fluid current The configuration resembles a dynamo the sea water being the rotor and the antenna the stator The main advantage of the Magnetohydrodynamics MHD conversion is the absence of moving mechanical drive train components which make contemporary systems vulnerable and maintenance demanding

217

Dynamics of a deformable active particle under shear flow  

E-Print Network (OSTI)

The motion of a deformable active particle in linear shear flow is explored theoretically. Based on symmetry considerations, in two spatial dimensions, we propose coupled nonlinear dynamical equations for the particle position, velocity, deformation, and rotation. In our model, both, passive rotations induced by the shear flow as well as active spinning motions, are taken into account. Our equations reduce to known models in the two limits of vanishing shear flow and vanishing particle deformability. For varied shear rate and particle propulsion speed, we solve the equations numerically and obtain a manifold of different dynamical modes including active straight motion, periodic motions, motions on undulated cycloids, winding motions, as well as quasi-periodic and chaotic motions induced at high shear rates. The types of motion are distinguished by different characteristics in the real-space trajectories and in the dynamical behavior of the particle orientation and its deformation. Our predictions can be verified in experiments on self-propelled droplets exposed to a linear shear flow.

Mitsusuke Tarama; Andreas M. Menzel; Borge ten Hagen; Raphael Wittkowski; Takao Ohta; Hartmut Löwen

2013-07-08T23:59:59.000Z

218

Maryland Abuzz with Retrofit Converts | Department of Energy  

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

Abuzz with Retrofit Converts Abuzz with Retrofit Converts Maryland Abuzz with Retrofit Converts January 7, 2010 - 2:06pm Addthis Joshua DeLung Tim Kenny got a college degree in fisheries biology, but his real passion lies in something he's spent the last 20 years doing - helping American families in Maryland, Pennsylvania and Washington, D.C. He makes his living in the clean energy economy by finding ways people can save money on their energy bills and make their homes cleaner, safer and more comfortable. About four years ago, he started Housewarmers, a business that performs energy audits and weatherization work on the homes of everyday clientele. Tim also helps community action agencies complete weatherization work as a contractor through a separate nonprofit business, C&O Conservation, for

219

A high-efficiency thermoelectric converter for space applications  

DOE Green Energy (OSTI)

This paper presents a concept for using high-temperature superconducting materials in thermoelectric generators (SCTE) to produce electricity at conversion efficiencies approaching 50% of the Carrot efficiency. The SCTE generator is applicable to systems operating in temperature ranges of high-temperature superconducting materials and thus would be a low-grade converter. Operating in cryogenic temperature ranges provides the advantage of inherently increasing the limits of the Carrot efficiency. Potential applications are for systems operating in space where the ambient temperatures are in the cryogenic temperature range. The advantage of using high-temperature superconducting material in a thermoelectric converter is that it would significantly reduce or eliminate the Joule heating losses in a thermoelectric element. This paper investigates the system aspects and the material requirements of the SCTE converter concept, and presents a conceptual design and an application for a space power system.

Metzger, J.D. [Westinghouse Savannah River Co., Aiken, SC (United States); El-Genk, M.S. [New Mexico Univ., Albuquerque, NM (United States). Inst. for Space Nuclear Power Studies

1990-12-31T23:59:59.000Z

220

NETL: News Release - Converting Emissions into Energy - Three Companies to  

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

September 14, 2000 September 14, 2000 Converting Emissions into Energy - Three Companies To Develop Technologies for Tapping Coal Mine Methane Methane, the chief constituent of natural gas, is a potent greenhouse gas, and millions of cubic feet of it escape daily from active coal mines. Now, three projects selected the U.S. Department of Energy propose new ways to capture the gas and convert it to useful energy -- reducing an environmental threat while adding to the nation's supplies of clean natural gas and electric power. The National Energy Technology Laboratory, the Energy Department's chief field site for its fossil energy research program, has selected: Appalachian-Pacific Coal Mine Methane Power Co., LLC, Arlington, VA, to work with West Virginia University Research Corp., Morgantown, WV, and Invitation Energy, Mannington, WV, to convert coal mine methane from mines in Marion County, WV, and surrounding areas into liquefied natural gas (LNG) to fuel heavy trucks.

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

MHK Technologies/Seatricity wave energy converter | Open Energy Information  

Open Energy Info (EERE)

Seatricity wave energy converter Seatricity wave energy converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Seatricity wave energy converter.jpg Technology Profile Primary Organization Seatricity Project(s) where this technology is utilized *MHK Projects/Seatricity Antigua *MHK Projects/Seatricity Orkney Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 7/8: Open Water System Testing & Demonstration & Operation Technology Description In the simplest terms, a float travels up and down with the waves and operates a pump to pressurise sea water which is piped ashore. Many individual pumps are connected together to produce substantial amounts of pressurized water. Once ashore the pressurized sea water is used to drive a standard hydroelectric turbine to produce electricity.

222

A high-efficiency thermoelectric converter for space applications  

DOE Green Energy (OSTI)

This paper presents a concept for using high-temperature superconducting materials in thermoelectric generators (SCTE) to produce electricity at conversion efficiencies approaching 50% of the Carrot efficiency. The SCTE generator is applicable to systems operating in temperature ranges of high-temperature superconducting materials and thus would be a low-grade converter. Operating in cryogenic temperature ranges provides the advantage of inherently increasing the limits of the Carrot efficiency. Potential applications are for systems operating in space where the ambient temperatures are in the cryogenic temperature range. The advantage of using high-temperature superconducting material in a thermoelectric converter is that it would significantly reduce or eliminate the Joule heating losses in a thermoelectric element. This paper investigates the system aspects and the material requirements of the SCTE converter concept, and presents a conceptual design and an application for a space power system.

Metzger, J.D. (Westinghouse Savannah River Co., Aiken, SC (United States)); El-Genk, M.S. (New Mexico Univ., Albuquerque, NM (United States). Inst. for Space Nuclear Power Studies)

1990-01-01T23:59:59.000Z

223

Quartz crystal microbalance based on passive frequency to voltage converter  

SciTech Connect

In dynamics of evaporation or drying of microdrops from a solid surface, a faster and precise quartz crystal microbalance (QCM) is needed. The fast QCM based on frequency to voltage converter is an attractive and powerful tool in the investigation of the dynamic regime of evaporation to translate the frequency shift in terms of a continuous voltage change. The frequency shift monitoring in fast QCM applications is a real challenge for electronic processing interface. Originally developed as a frequency shift processing interface, this novel passive frequency to voltage converter can produce faster, stable, and accurate results in regard to the QCM sensor behavior. In this article, the concept and circuit of passive frequency to voltage converter will be explained followed by static and dynamic characterization. Experimental results of microdrops evaporation will be given.

Burda, Ioan; Tunyagi, Arthur [Department of Physics, Babes-Bolyai University, Cluj-Napoca, 400084 (Romania)

2012-02-15T23:59:59.000Z

224

Combustor design tool for a gas fired thermophotovoltaic energy converter  

DOE Green Energy (OSTI)

Recently, there has been a renewed interest in thermophotovoltaic (TPV) energy conversion. A TPV device converts radiant energy from a high temperature incandescent emitter directly into electricity by photovoltaic cells. The current Department of Energy sponsored research involves the design, construction and demonstration of a prototype TPV converter that uses a hydrocarbon fuel (such as natural gas) as the energy source. As the photovoltaic cells are designed to efficiently convert radiant energy at a prescribed wavelength, it is important that the temperature of the emitter be nearly constant over its entire surface. The US Naval Academy has been tasked with the development of a small emitter (with a high emissivity) that can be maintained at 1,756 K (2,700 F). This paper describes the computer spreadsheet model that was developed as a tool to be used for the design of the high temperature emitter.

Lindler, K.W.; Harper, M.J. [Naval Academy, Annapolis, MD (United States). Naval Architecture, Ocean and Marine Engineering Dept.

1995-07-01T23:59:59.000Z

225

Applications and benefits of catalytic converter thermal management  

DOE Green Energy (OSTI)

A catalytic converter thermal management system (TMS) using variable-conductance vacuum insulation and phase-change thermal storage can maintain the converter temperature above its operating temperature for many hours, allowing most trips to begin with minimal ``cold-start`` emissions. The latest converter TMS prototype was tested on a Ford Taurus (3.0 liter flex-fuel engine) at Southwest Research Institute. Following a 24-hour soak, the FTP-75 emissions were 0.031, 0.13, and 0.066 g/mile for NMHC, CO, and NOx, respectively. Tests were also run using 85% ethanol (E85), resulting in values of 0.005, 0.124, and 0.044 g/mile, and 0.005 g/mile NMOG. Compared to the baseline FTP levels, these values represent reductions of 84% to 96% for NMHC, NMOG, and CO.

Burch, S.D.; Keyser, M.A.; Colucci, C.P.; Potter, T.F.; Benson, D.K.; Biel, J.P.

1996-07-01T23:59:59.000Z

226

Active, polymer-based composite material implementing simple shear  

E-Print Network (OSTI)

A novel active material for controllable, high work density applications was designed, fabricated, analyzed, and tested. This active material uses a lens-shaped element to implement simple shear motion with gas pressure actuation. The lens element is a bladder-filled Kevlar fabric embedded in a polyurethane matrix. The polyurethane’s hyperelastic material parameters were found by experiment and estimated by numerical analysis. The Ogden material constant set found shows good agreement within the shear actuator’s working range. A fabricated, single-element shear actuator reached 34.2% free shear strain when pressurized to 1.03 MPa. A unitary shear actuator was modeled as were single-acting and dual-acting shear actuator arrays so that solitary and multi-cell behaviors were estimated. Actuator work performance and power from nonlinear finite element analysis found conventional work density is 0.2289 MJ/m3 and 0.2482 MJ/m3, for the singleacting and double-acting shear actuator, respectively. Scientific work densities are 0.0758 MJ/m3 and 0.0375 MJ/m3, for single-acting and double-acting shear actuators, respectively. Calculation shows the volumetric power for a single-acting shear actuator is 0.4578 MW/m3 and 0.4964 MW/m3 for the double-acting shear actuator. Finally, a nastic actuator is applied to twist a generic structural beam. The nasticmaterial actuated structure has an advantage over conventional actuator systems. Work per unit volume for nastic materials is 2280~8471% higher than conventional, discrete actuators that use electric motors. When compared by work per unit mass, this nastic actuator is 2592~13900% better than conventional actuator because nastic actuator is made from lighter materials and it distributes the actuation throughout the structure, which eliminates connecting components. The nastic actuator’s volumetric power is 2217~8602% higher than conventional actuators. Finally, the nastic actuator is 2656~14269% higher than conventional actuators for power per unit mass.

Lee, Sang Jin

2008-12-01T23:59:59.000Z

227

Liquid metal thermal-electric converter electrode development  

DOE Green Energy (OSTI)

This report describes work done in support of distributed receiver technology development. Dish-electric systems are being pursued in an effort to circumvent the need for energy transport by providing for heat-to-electricity energy conversion by individual heat engines at the focal point of parabolic dish concentrators. The Liquid Metal Thermal-Electric Converter is an engine that can convert thermal energy to electricity without the need for moving parts. The report documents the results of contracted work in the development of a long-lifetime, high-performance electrode for LMTEC, including the materials prepared for it. 17 refs., 20 figs., 3 tabs.

Martinez, J.I. (ed.)

1988-02-01T23:59:59.000Z

228

Process for converting cellulosic materials into fuels and chemicals  

DOE Patents (OSTI)

A process for converting cellulosic materials, such as waste paper, into fuels and chemicals utilizing enzymatic hydrolysis of the major constituent of paper, cellulose. A waste paper slurry is contacted by cellulase in an agitated hydrolyzer. The cellulase is produced from a continuous, columnar, fluidized-bed bioreactor utilizing immobilized microorganisms. An attritor and a cellobiase reactor are coupled to the agitated hydrolyzer to improve reaction efficiency. The cellulase is recycled by an adsorption process. The resulting crude sugars are converted to dilute product in a fluidized-bed bioreactor utilizing microorganisms. The dilute product is concentrated and purified by utilizing distillation and/or a biparticle fluidized-bed bioreactor system.

Scott, Charles D. (Oak Ridge, TN); Faison, Brendlyn D. (Knoxville, TN); Davison, Brian H. (Knoxville, TN); Woodward, Jonathan (Oak Ridge, TN)

1994-01-01T23:59:59.000Z

229

Pre-converted nitric oxide gas in catalytic reduction system  

DOE Patents (OSTI)

A two-stage catalyst comprises an oxidative first stage and a reductive second stage. The first stage is intended to convert NO to NO.sub.2 in the presence of O.sub.2. The second stage serves to convert NO.sub.2 to environmentally benign gases that include N2, CO2, and H.sub.2 O. By preconverting NO to NO.sub.2 in the first stage, the efficiency of the second stage for NO.sub.x reduction is enhanced. For example, an internal combustion engine exhaust is connected by a pipe to a first chamber. An oxidizing first catalyst converts NO to NO.sub.2 in the presence of O.sub.2 and includes platinum/alumina, e.g., Pt/Al.sub.2 O.sub.3 catalyst. A flow of hydrocarbons (C.sub.x H.sub.y) is input from a pipe into a second chamber. For example, propene can be used as a source of hydrocarbons. The NO.sub.2 from the first catalyst mixes with the hydrocarbons in the second chamber. The mixture proceeds to a second reduction catalyst that converts NO.sub.2 to N2, CO2, and H.sub.2 O, and includes a gamma-alumina .gamma.-Al.sub.2 O.sub.3. The hydrocarbons and NO.sub.x are simultaneously reduced while passing through the second catalyst.

Hsiao, Mark C. (Livermore, CA); Merritt, Bernard T. (Livermore, CA); Penetrante, Bernardino M. (San Ramon, CA); Vogtlin, George E. (Fremont, CA)

1999-01-01T23:59:59.000Z

230

Research on MPPT for Solar Cells Based on Flyback Converter  

Science Conference Proceedings (OSTI)

A voltage source and rheostat are successfully used to simulate the solar cell's character in this paper. Its feasibility is analyzed theoretically. The basic principle of the maximum power point tracking (MPPT) is described. An improved disturbance ... Keywords: solar cells, maximum power point tracking (MPPT), flyback converter

Zhang Housheng

2010-05-01T23:59:59.000Z

231

A summary of North American HVDC converter station reliability specifications  

SciTech Connect

This paper summarizes Reliability, Availability, and Maintainability (RAM) specifications that were issued for thyristor based HVDC converter stations in service in North America. A total of twenty project specifications are summarized. A detailed summary by project is shown with specific quantitative requirements categorized. Definitions of terms, representative design principles, and formulas used in calculating RAM parameters contained in existing reliability specifications are presented.

Vancers, I. (ABB Power Systems Inc., Los Angeles, CA (United States)); Hormozi, F.J. (Los Angeles Dept. of Water and Power, CA (United States))

1993-07-01T23:59:59.000Z

232

Energy Savings Assessment for Digital-to-Analog Converter Boxes  

SciTech Connect

The Digital Television (DTV) Converter Box Coupon Program was administered by the U.S. government to subsidize purchases of digital-to-analog converter boxes, with up to two $40 coupons for each eligible household. In order to qualify as Coupon Eligible Converter Boxes (CECBs), these devices had to meet a number of minimum performance specifications, including energy efficiency standards. The Energy Star Program also established voluntary energy efficiency specifications that are more stringent than the CECB requirements. In this study, we measured the power and energy consumptions for a sample of 12 CECBs (including 6 Energy Star labeled models) in-use in homes and estimated aggregate energy savings produced by the energy efficiency policies. Based on the 35 million coupons redeemed through the end of the program, our analysis indicates that between 2500 and 3700 GWh per year are saved as a result of the energy efficiency policies implemented on digital-to-analog converter boxes. The energy savings generated are equivalent to the annual electricity use of 280,000 average US homes.

Cheung, Hoi Ying Iris; Meier, Alan; Brown, Richard

2011-01-18T23:59:59.000Z

233

Cycling firing method for bypass operation of bridge converters  

DOE Patents (OSTI)

The bridge converter comprises a number of switching elements and an electronic logic system which regulated the electric power levels by controlling the firing, i.e., the initiation of the conduction period of the switching elements. Cyclic firing of said elements allows the direct current to bypass the alternating current system with high power factor and negligible losses.

Zabar, Zivan (99-72 66th Rd., Apt. 9N, Forest Hills, NY 11375)

1982-01-01T23:59:59.000Z

234

A Dual Supply Buck Converter with Improved Light Load Efficiency  

E-Print Network (OSTI)

Power consumption is the primary concern in battery-operated portable applications. Buck converters have gained popularity in powering portable devices due to their compact size, good current delivery capability and high efficiency. However, portable devices are operating under light load condition for the most of the time. Conventional buck converters suffer from low light-load efficiency which severely limits battery lifetime. In this project, a novel technique for buck converter is proposed to reduce the switching loss by reducing the effective input supply voltage at light load. This is achieved by switching between two different input voltages (3.3V and 1.65V) depending on the output current value. Experimental results show that this technique improves the efficiency at light loads by 18.07%. The buck voltage possesses an output voltage of 0.9V and provides a maximum output current of 400mA. The buck converter operates at a switching frequency of 1MHz. The prototype was fabricated using 0.18µm CMOS technology, and occupies a total active area of 0.6039mm^2.

Chen, Hui

2013-05-01T23:59:59.000Z

235

Apparatus for converting biomass to a pumpable slurry  

DOE Patents (OSTI)

An apparatus used in the pretreatment of wood chips in a process for converting biomass to a liquid hydrocarbonaceous fuel. The apparatus functions to break down the wood chips to a size distribution that can be readily handled in a slurry form. Low maintenance operation is obtained by hydrolyzing the chips in a pressure vessel having no moving parts.

Ergun, Sabri (Hillsborough, CA); Schaleger, Larry L. (Oakland, CA); Wrathall, James A. (Berkeley, CA); Yaghoubzadeh, Nasser (El Cerrito, CA)

1986-01-01T23:59:59.000Z

236

SELECTING FUELS WITHIN ENVIRONMENTAL IMPACT REQUIREMENTS: CONVERTING A  

E-Print Network (OSTI)

SELECTING FUELS WITHIN ENVIRONMENTAL IMPACT REQUIREMENTS: CONVERTING A PRESENT COMBUSTION SYSTEM fossil fuels. Next, the alternative fuels with large po tential energy recovery are selected and presentDIIsrCDUICTOI SCIIU, ! i ItFUS£_pu- ;1II-'NfU1MTJ: 'U.)'// PIr I It \\I I ' I Ir-SUIIDDU\\N. £DI

Columbia University

237

Minimizing power pulsations in a free piston energy converter  

E-Print Network (OSTI)

A Free Piston Energy Converter (FPEC) is a combination of a linear combustion engine and a linear electrical machine. This type of converter has many potential advantages like high efficiency, low fuel consumption and low emissions, which make it suitable for a series hybrid vehicle. However, the generated power pulsates due to the reciprocating motion of the translator. This paper presents a comparative study on how different generator force profiles affect the electric power pulsations produced by the FPEC. In addition, the influence of these profiles on translator motion and the needed power converter current is investigated. A dynamic free piston model is used for the investigation. Results show that the generator force profile has a major impact on the power pulsation amplitude and peak current demand. Thus the chosen force profile will affect dimensioning of power converter, electrical machine and energy storage. Furthermore, loading the translator heavily in the beginning or end of the stroke seems to affect the peak translator velocity more than evenly distributed load profiles.

Jörgen Hansson; Mats Leksell; Fredrik Carlsson

2005-01-01T23:59:59.000Z

238

Elimination of Harmonics in a Multilevel Converter for HEV Applications  

E-Print Network (OSTI)

possible solu- tions are found. Keywords­ Hybrid Electric Vehicles, Multilevel Convert- ers, Harmonic Elimination, Resultants I. Introduction Designs for heavy duty hybrid-electric vehicles (HEVs) that have large electric drives such as tractor trailers, trans- fer trucks, or military vehicles will require advanced

Tolbert, Leon M.

239

Control and Power Management of Converter Fed Microgrids  

E-Print Network (OSTI)

1 Control and Power Management of Converter Fed Microgrids Charles K. Sao, Member, IEEE, and Peter in parallel in a VSC fed microgrid. Each current controlled VSC in such a microgrid has its own VPD/FQB controller that sets its current references to regulate the voltage and frequency of a common microgrid bus

Lehn, Peter W.

240

Automated Synthesis Tool for Design Optimization of Power Electronic Converters  

E-Print Network (OSTI)

Designers of power electronic converters usually face the challenge of having multiple performance indices that must be simultaneously optimized, such as maximizing efficiency while minimizing mass or maximizing reliability while minimizing cost. The experienced engineer applies his or her judgment to reduce the number of possible designs to a manageable number of feasible designs for which to prototype and test; thus, the optimality of this design-space reduction is directly dependent upon the experience, and expertise and biases of the designer. The practitioner is familiar with tradeoff analysis; however, simple tradeoff studies can become difficult or even intractable if multiple metrics are considered. Hence a scientific and systematic approach is needed. In this dissertation, a multi-objective optimization framework is presented as a design tool. Optimization of power electronic converters is certainly not a new subject. However, when limited to off-the-shelf components, the resulting system is really optimized only over the set of commercially available components, which may represent only a subset of the design space; the reachable space limited by available components and technologies. While this approach is suited to cost-reduce an existing design, it offers little insight into design possibilities for greenfield projects. Instead, this work uses the Technology Characterization Methods (TCM) to broaden the reachable design space by considering fundamental component attributes. The result is the specification for the components that create the optimal design rather than an evaluation of an apriori selected set of candidate components. A unique outcome of this approach is that new technology development vectors may emerge to develop optimized components for the optimized power converter. The approach presented in this work uses a mathematical descriptive language to abstract the characteristics and attributes of the components used in a power electronic converter in a way suitable for multi-objective and constrained optimization methods. This dissertation will use Technology Characterization Methods (TCM) to bridge the gap between high-level performance attributes and low-level design attributes where direct relationship between these two does not currently exist. The loss and size models for inductors, capacitors, IGBTs, MOSFETs and heat sinks will be used to form objective functions for the multi-objective optimization problem. A single phase IGBT-based inverter is optimized for efficiency and volume based on the component models derived using TCM. Comparing the obtained designs to a design, which can be made from commercial off-the-shelf components, shows that converter design can be optimized beyond what is possible from using only off-the-shelf components. A module-integrated photovoltaic inverter is also optimized for efficiency, volume and reliability. An actual converter is constructed using commercial off-the-shelf components. The converter design is chosen as close as possible to a point obtained by optimization. Experimental results show that the converter modeling is accurate. A new approach for evaluation of efficiency in photovoltaic converter is also proposed and the front-end portion of a photovoltaic converter is optimized for this efficiency, as well as reliability and volume.

Mirjafari, Mehran

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Wall Orientation and Shear Stress in the Lattice Boltzmann Model  

E-Print Network (OSTI)

The wall shear stress is a quantity of profound importance for clinical diagnosis of artery diseases. The lattice Boltzmann is an easily parallelizable numerical method of solving the flow problems, but it suffers from errors of the velocity field near the boundaries which leads to errors in the wall shear stress and normal vectors computed from the velocity. In this work we present a simple formula to calculate the wall shear stress in the lattice Boltzmann model and propose to compute wall normals, which are necessary to compute the wall shear stress, by taking the weighted mean over boundary facets lying in a vicinity of a wall element. We carry out several tests and observe an increase of accuracy of computed normal vectors over other methods in two and three dimensions. Using the scheme we compute the wall shear stress in an inclined and bent channel fluid flow and show a minor influence of the normal on the numerical error, implying that that the main error arises due to a corrupted velocity field near ...

Matyka, Maciej; Miros?aw, ?ukasz

2013-01-01T23:59:59.000Z

242

Wind turbines convert the kinetic energy in moving air into rotational energy, which in turn is converted  

E-Print Network (OSTI)

Wind turbines convert the kinetic energy in moving air into rotational energy, which in turn the wind doesn't blow? Wind Power on the Community Scale Renewable Energy Research Laboratory, University Energy Research Laboratory brings you this series of fact sheets about Wind Power on the community scale

Massachusetts at Amherst, University of

243

Alpaca Farmers Shearing Energy Costs with Solar | Department of Energy  

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

Alpaca Farmers Shearing Energy Costs with Solar Alpaca Farmers Shearing Energy Costs with Solar Alpaca Farmers Shearing Energy Costs with Solar June 24, 2010 - 4:11pm Addthis Alpacas stand outside a solar powered barn on the property of Larry and Cathi Dietsch | Photo courtesy of Larry Dietsch Alpacas stand outside a solar powered barn on the property of Larry and Cathi Dietsch | Photo courtesy of Larry Dietsch Paul Lester Communications Specialist, Office of Energy Efficiency and Renewable Energy It takes a lot of work - and energy - to keep a herd of alpacas, known for their lustrous, long wool coats, happy and healthy. But, by harnessing the sun to power their 12-acre farm, a Georgia couple has shown they are up to the task. Larry and Cathi Dietsch, owners of Destiny Alpacas in Young Harris, are

244

Alpaca Farmers Shearing Energy Costs with Solar | Department of Energy  

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

Alpaca Farmers Shearing Energy Costs with Solar Alpaca Farmers Shearing Energy Costs with Solar Alpaca Farmers Shearing Energy Costs with Solar June 24, 2010 - 4:11pm Addthis Alpacas stand outside a solar powered barn on the property of Larry and Cathi Dietsch | Photo courtesy of Larry Dietsch Alpacas stand outside a solar powered barn on the property of Larry and Cathi Dietsch | Photo courtesy of Larry Dietsch Paul Lester Communications Specialist, Office of Energy Efficiency and Renewable Energy It takes a lot of work - and energy - to keep a herd of alpacas, known for their lustrous, long wool coats, happy and healthy. But, by harnessing the sun to power their 12-acre farm, a Georgia couple has shown they are up to the task. Larry and Cathi Dietsch, owners of Destiny Alpacas in Young Harris, are

245

Combined Ideal and Kinetic Effects on Reversed Shear Alfven Eigenmodes  

SciTech Connect

A theory of Reversed Shear Alfven Eigenmodes (RSAEs) is developed for reversed magnetic field shear plasmas when the safety factor minimum, qmin, is at or above a rational value. The modes we study are known sometimes as either the bottom of the frequency sweep or the down sweeping RSAEs. We show that the ideal MHD theory is not compatible with the eigenmode solution in the reversed shear plasma with qmin above integer values. Corrected by special analytic FLR condition MHD dispersion of these modes nevertheless can be developed. Large radial scale part of the analytic RSAE solution can be obtained from ideal MHD and expressed in terms of the Legendre functions. The kinetic equation with FLR effects for the eigenmode is solved numerically and agrees with the analytic solutions. Properties of RSAEs and their potential implications for plasma diagnostics are discussed.

N.N. Gorelenkov, G.J. Kramer, and R. Nazikian

2011-05-23T23:59:59.000Z

246

Shear-strain-induced chemical reactivity of layered molecular crystals  

SciTech Connect

A density-functional-theory study of shear-related dissociation of two molecular crystals, diamino-dinitroethylene (FOX-7) and triamino-trinitrobenzine (TATB), is presented. A detailed explanation is proposed for the fact that FOX-7 is more sensitive than TATB while their sensitivities to initiation of chemistry have been expected to be comparable. We suggest that shear plays a crucial role in dissociation of molecules in organic energetic crystals and may be imperative in providing specific recommendations on ways for materials design.

M. M. Kuklja; Sergey N. Rashkeev

2007-04-01T23:59:59.000Z

247

Shear Strength Measurement Benchmarking Tests for K Basin Sludge Simulants  

SciTech Connect

Equipment development and demonstration testing for sludge retrieval is being conducted by the K Basin Sludge Treatment Project (STP) at the MASF (Maintenance and Storage Facility) using sludge simulants. In testing performed at the Pacific Northwest National Laboratory (under contract with the CH2M Hill Plateau Remediation Company), the performance of the Geovane instrument was successfully benchmarked against the M5 Haake rheometer using a series of simulants with shear strengths (?) ranging from about 700 to 22,000 Pa (shaft corrected). Operating steps for obtaining consistent shear strength measurements with the Geovane instrument during the benchmark testing were refined and documented.

Burns, Carolyn A.; Daniel, Richard C.; Enderlin, Carl W.; Luna, Maria; Schmidt, Andrew J.

2009-06-10T23:59:59.000Z

248

Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Yellow Cab Converts Yellow Cab Converts Taxis to Propane in Columbus, Ohio to someone by E-mail Share Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on Facebook Tweet about Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on Twitter Bookmark Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on Google Bookmark Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on Delicious Rank Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on Digg Find More places to share Alternative Fuels Data Center: Yellow Cab Converts Taxis to Propane in Columbus, Ohio on AddThis.com... July 9, 2011 Yellow Cab Converts Taxis to Propane in Columbus, Ohio

249

NETL: News Release - Secretary Chu Announces Six Projects to Convert  

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

2, 2010 2, 2010 Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products $106 Million Recovery Act Investment Will Reduce CO2 Emissions and Mitigate Climate Change Washington, D.C. - U.S. Energy Secretary Steven Chu announced today the selections of six projects that aim to find ways of converting captured carbon dioxide (CO2) emissions from industrial sources into useful products such as fuel, plastics, cement, and fertilizers. Funded with $106 million from the American Recovery and Reinvestment Act -matched with $156 million in private cost-share -today's selections demonstrate the potential opportunity to use CO2 as an inexpensive raw material that can help reduce carbon dioxide emissions while producing useful by-products that Americans can use.

250

NREL: News - NREL to Help Convert Methane to Liquid Diesel  

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

113 113 NREL to Help Convert Methane to Liquid Diesel Advanced research project could lead to lower greenhouse emissions, new life for spent gas and oil wells January 3, 2013 The U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) will help develop microbes that convert methane found in natural gas into liquid diesel fuel, a novel approach that if successful could reduce greenhouse gas emissions and lower dependence on foreign oil. The amount of natural gas simply flared or vented from oil wells globally is enormous - equal to one-third of the amount of petroleum used in the United States each year. And every molecule of methane vented to the atmosphere in that process has the global-warming capacity of 12 molecules of carbon dioxide.

251

GTRI's Convert Program: Minimizing the Use of Highly Enriched Uranium |  

National Nuclear Security Administration (NNSA)

Program: Minimizing the Use of Highly Enriched Uranium | Program: Minimizing the Use of Highly Enriched Uranium | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Fact Sheets > GTRI's Convert Program: Minimizing the Use of ... Fact Sheet GTRI's Convert Program: Minimizing the Use of Highly Enriched Uranium Apr 12, 2013

252

Planar LTCC transformers for high voltage flyback converters: Part II.  

Science Conference Proceedings (OSTI)

This paper is a continuation of the work presented in SAND2007-2591 'Planar LTCC Transformers for High Voltage Flyback Converters'. The designs in that SAND report were all based on a ferrite tape/dielectric paste system originally developed by NASCENTechnoloy, Inc, who collaborated in the design and manufacturing of the planar LTCC flyback converters. The output/volume requirements were targeted to DoD application for hard target/mini fuzing at around 1500 V for reasonable primary peak currents. High voltages could be obtained but with considerable higher current. Work had begun on higher voltage systems and is where this report begins. Limits in material properties and processing capabilities show that the state-of-the-art has limited our practical output voltage from such a small part volume. In other words, the technology is currently limited within the allowable funding and interest.

Schofield, Daryl (NASCENTechnology, Inc., Watertown, SD); Schare, Joshua M., Ph.D.; Slama, George (NASCENTechnology, Inc., Watertown, SD); Abel, David (NASCENTechnology, Inc., Watertown, SD)

2009-02-01T23:59:59.000Z

253

Catalyst for converting synthesis gas to liquid motor fuels  

DOE Patents (OSTI)

The addition of an inert metal component, such as gold, silver or copper, to a Fischer-Tropsch catalyst comprising cobalt enables said catalyst to convert synthesis gas to liquid motor fuels at about 240.degree.-370.degree. C. with advantageously reduced selectivity of said cobalt for methane in said conversion. The catalyst composition can advantageously include a support component, such as a molecular sieve, co-catalyst/support component or a combination of such support components.

Coughlin, Peter K. (Yorktown Heights, NY)

1986-01-01T23:59:59.000Z

254

MHK Technologies/OCEANTEC Wave Energy Converter | Open Energy Information  

Open Energy Info (EERE)

Wave Energy Converter Wave Energy Converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage OCEANTEC Wave Energy Converter.jpg Technology Profile Primary Organization OCEANTEC Energias Marinas S L Technology Resource Click here Wave Technology Type Click here Attenuator Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description OCEANTEC Marine Energy Company Ltd owned by Iberdrola and TECNALIA is developing a sensor for wave energy technology type Spanish attenuator Floating body oscillates due to wave excitation in its main DOF pitch Mooring system allows the body to weathervane so that it is faced to the predominant wave propagation direction Main advantage capture system completely encapsulated free of contact with sea water A flywheel continuously spins under the action of an electric motor Z The pitching motion of the WEC caused by wave action is transformed into an alternating precession in the longitudinal hull axis X A coupling device transforms this precession into an unidirectional rotation of higher frequency that is used to feed a conventional electric generator

255

Analog-to-digital converter with data processing  

DOE Patents (OSTI)

This device incorporates an analog-digital converter including a data processing section which can be used to perform data processing on digitized data as is generated, off-line from the system processor. It consists of a 12 bit analog to digital converter for generating discrete digital data representative of an input analog signal, a data bus coupled to receive the digital data as is generated, a 512 Kbyte memory RAM to store the digitized data, and a system bus coupled to the data processing element for outputting the result of the performed operation. This is the first device with analog to digital converters and memory. It is the first module to be designed to the VXIbus format. This device is the first to incorporate an averaging circuit in the design. It has a sealed analog module (outputs the sum and difference of the log signals for both the X and the Y axis of the beam position module), memory channels, four averaging channels the programmable trigger and digitizer clock logic, and a VXIbus interface. This device is useful in the fields of data acquisition, data processing, communication systems, instrumentation and electronics.

Jones, A.

1993-01-01T23:59:59.000Z

256

Frequency converter development for the National Ignition Facility  

SciTech Connect

The design of the National Ignition Facility (NIF) incorporates a type I/type II third harmonic generator to convert the 1.053-{micro}m fundamental wavelength of the laser amplifier to a wavelength of 0.351 {micro}m for target irradiation. To understand and control the tolerances in the converter design, we have developed a comprehensive error budget that accounts for effects that are known to influence conversion efficiency, including variations in amplitude and phase of the incident laser pulse, temporal bandwidth of the incident laser pulse, crystal surface figure and bulk non-uniformities, angular alignment errors, Fresnel losses, polarization errors and crystal temperature variations. The error budget provides specifications for the detailed design of the NIF final optics assembly (FOA) and the fabrication of optical components. Validation is accomplished through both modeling and measurement, including full-scale Beamlet tests of a 37-cm aperture frequency converter in a NIF prototype final optics cell. The prototype cell incorporates full-perimeter clamping to support the crystals, and resides in a vacuum environment as per the NIF design.

Auerbach, J M; Barker, C E; Burkhart, S C; Couture, S A; DeYoreo, J J; Hackel, L A; Hibbard, R L; Liou, L W; Norton, M A; Wegner, P J; Whitman, P A

1998-10-30T23:59:59.000Z

257

Trimode Power Converter optimizes PV, diesel and battery energy sources  

SciTech Connect

Conservatively, there are 100,000 localities in the world waiting for the benefits that electricity can provide, and many of these are in climates where sunshine is plentiful. With these locations in mind a prototype 30 kW hybrid system has been assembled at Sandia to prove the reliability and economics of photovoltaic, diesel and battery energy sources managed by an autonomous power converter. In the Trimode Power Converter the same power parts, four IGBT`s with an isolation transformer and filter components, serve as rectifier and charger to charge the battery from the diesel; as a stand-alone inverter to convert PV and battery energy to AC; and, as a parallel inverter with the diesel-generator to accommodate loads larger than the rating of the diesel. Whenever the diesel is supplying the load, an algorithm assures that the diesel is running at maximum efficiency by regulating the battery charger operating point. Given the profile of anticipated solar energy, the cost of transporting diesel fuel to a remote location and a five year projection of load demand, a method to size the PV array, battery and diesel for least cost is developed.

O`Sullivan, G. [Abacus Controls, Inc., Somerville, NJ (United States); Bonn, R.; Bower, W. [Sandia National Labs., Albuquerque, NM (United States)

1994-07-01T23:59:59.000Z

258

Vertical Mixing and Transports through a Stratified Shear Layer  

Science Conference Proceedings (OSTI)

A stratified shear layer was generated in the laboratory by driving a turbulent mixed layer of depth D over a quiescent, deep dense layer. As a result, a density interface of thickness ?b across which the buoyancy jump is ?b was formed between ...

E. J. Strang; H. J. S. Fernando

2001-08-01T23:59:59.000Z

259

Surface waves in a stretched and sheared incompressible elastic material  

E-Print Network (OSTI)

In this paper we analyze the effect of a combined pure homogeneous strain and simple shear in a principal plane of the latter on the propagation of surface waves for an incompressible isotropic elastic half-space whose boundary is normal to the glide planes of the shear. This generalizes previous work in which, separately, pure homogeneous strain and simple shear were considered. For a special class of materials the secular equation is obtained in explicit form and then specialized to recover results obtained previously for the two cases mentioned above. A method for obtaining the secular equation for a general form of strain-energy function is then outlined. In general this is very lengthy and the result is not listed, but, for the case in which there is no normal stress on the half-space boundary, the result is given, for illustration, in respect of the so-called generalized Varga material. Numerical results are given to show how the surface wave speed depends on both the underlying pure homogeneous strain and the superimposed simple shear. Further numerical results are provided for the Gent model of limiting chain extensibility.

Michel Destrade; Ray W. Ogden

2013-04-23T23:59:59.000Z

260

Leukocytes dynamics in microcirculation under shear-thinning blood flow  

Science Conference Proceedings (OSTI)

We present detailed simulation results of localised hemodynamics for a cluster of rolling leukocytes under shear-thinning blood flow using a lattice Boltzmann model. Leukocytes were modelled as hard spheres moving through a venule of rigid walls. The ... Keywords: Blood rheology, Flow in microvessels, Inflammation, Leukocytes recruitment

A. Sequeira; A. M. Artoli; A. S. Silva-Herdade; C. Saldanha

2009-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Tropical Cyclone Formation in a Sheared Environment: A Case Study  

Science Conference Proceedings (OSTI)

The development of Hurricane Danny (1997) from depression to hurricane was examined using cloud-to-ground lightning data, reconnaissance aircraft data, and satellite imagery. Vertical wind shear between 850 and 200 hPa of 5–11 m s?1 produced ...

John Molinari; David Vollaro; Kristen L. Corbosiero

2004-11-01T23:59:59.000Z

262

Laboratory Studies on the Effects of Shear on Fish  

DOE Green Energy (OSTI)

The overall objective of our studies was to specify an index describing the hydraulic force that fish experience when subjected to a shear environment. Fluid shear is a phenomenon that is important to fish. However, elevated levels of shear may result in strain rates that injure or kill fish. At hydroelectric generating facilities, concerns have been expressed that strain rates associated with passage through turbines, spillways, and fish bypass systems may adversely affect migrating fish. Development of fish friendly hydroelectric turbines requires knowledge of the physical forces (injury mechanisms) that impact entrained fish and the fish's tolerance to these forces. It requires up-front, pre-design specifications for the environmental conditions that occur within the turbine system, in other words, determining or assuming that those conditions known to injure fish will provide the descriptions of conditions that engineers must consider in the design of a turbine system. These biological specifications must be carefully and thoroughly documented throughout the design of a fish friendly turbine. To address the development of biological specifications, we designed and built a test facility where juvenile fish could be subjected to a range of shear environments and quantified their biological response.

Neitzel, Duane A.; Richmond, Marshall C.; Dauble, Dennis D.; Mueller, Robert P.; Moursund, Russell A.; Abernethy, Cary S.; Guensch, Greg R.

2000-09-20T23:59:59.000Z

263

Vertical Wind Shear Associated with Left-Moving Supercells  

Science Conference Proceedings (OSTI)

Vertical wind shear parameters are presented for 60 left-moving supercells across the United States, 53 of which produced severe hail (?1.9 cm). Hodographs corresponding to environments of left-moving supercells have a tendency to be more linear ...

Matthew J. Bunkers

2002-08-01T23:59:59.000Z

264

BEHAVIOUR OF FIBRE REINFORCED POLYMER (FRP) STIRRUPS AS SHEAR  

E-Print Network (OSTI)

r r r r r r r r r r r r r r r r r r r BEHAVIOUR OF FIBRE REINFORCED POLYMER (FRP) STIRRUPS AS SHEAR in Partial Fulfillment ofthe Requirements for the Degree of MASTER OF SCIENCE Structural Engineering Division Department ofCivil and Geological Engineering University ofManitoba Winnipeg, Manitoba © JUNE, 1999 #12;r r r

265

Gravity Waves in Shear and Implications for Organized Convection  

Science Conference Proceedings (OSTI)

It is known that gravity waves in the troposphere, which are often excited by preexisting convection, can favor or suppress the formation of new convection. Here it is shown that in the presence of wind shear or barotropic wind, the gravity waves ...

Samuel N. Stechmann; Andrew J. Majda

2009-09-01T23:59:59.000Z

266

Gravity Waves in Shear and Implications for Organized Convection  

E-Print Network (OSTI)

Gravity Waves in Shear and Implications for Organized Convection Samuel N. Stechmann Department, Los Angeles, CA 90095­1555. E-mail: stechmann@math.ucla.edu #12;ABSTRACT It is known that gravity, the gravity waves can create a more favorable environment on one side of preexisting convection than the other

Stechmann, Samuel N.

267

Real time quantitative elastography using supersonic shear wave imaging  

Science Conference Proceedings (OSTI)

Supersonic Shear Imaging (SSI) is a quantitative stiffness imaging technique based on the combination of a radiation force induced in tissue by an ultrasonic beam and ultrafast ultrasound imaging sequence (up to more than 10000 frames per second) catching ... Keywords: cancer, diagnosis, elastography, ultrafast imaging, ultrasound

Mickael Tanter; Mathieu Pernot; Gabriel Montaldo; Jean-Luc Gennisson; Eric Bavu; Emilie Macé; Thu-Mai Nguyen; Mathieu Couade; Mathias Fink

2010-04-01T23:59:59.000Z

268

The cosmic shear STIS parallel program - First results  

E-Print Network (OSTI)

Since the Universe is inhomogeneous on scales well below the Hubble radius, light bundles from distant galaxies are deflected and distorted by the tidal gravitational field of the large-scale matter distribution as they propagate through the Universe. Two-point statistical measures of the observed ellipticities, like the dispersion within a finite aperture or the ellipticity cross-correlation, can be related to the power spectrum of the large-scale structure. The measurement of cosmic shear (especially on small angular scales) can thus be used to constrain cosmological parameters and to test cosmological structure formation in the non-linear regime, without any assumptions about the relation between luminous and dark matter. In this paper we will present preliminary cosmic shear measurements on sub-arcminute scales, obtained from archival STIS parallel data. The high angular resolution of HST, together with the sensitivity and PSF-stability of STIS, allows us to measure cosmic shear along many independent lines-of-sight. Ongoing STIS parallel observations, currently being carried out in the frame of a big GO program (8562+9248), will greatly increase the number of available useful fields and will enable us to measure cosmic shear with higher accuracy on sub-arcminute scales.

H. Haemmerle; J. -M. Miralles; P. Schneider; T. Erben; R. A. E. Fosbury; W. Freudling; N. Pirzkal; S. D. M. White

2001-09-21T23:59:59.000Z

269

Finite-Amplitude Stability of a Zonal Shear Flow  

Science Conference Proceedings (OSTI)

We consider the stability of a zonal shear flow u¯ = tanhy in the framework of the ?-plane approximation. The objective of this study is to determine the effects of nonlinearity on the stability of the flow by perturbing about the known linear ...

A. G. Burns; S. A. Maslowe

1983-01-01T23:59:59.000Z

270

Bending and shear moduli of single-walled carbon nanotubes  

Science Conference Proceedings (OSTI)

Elastic properties of single-walled carbon nanotubes (SWCNT) obtained experimentally and computationally are reviewed. Attention is paid particularly on the evaluation of Young's and shear moduli of SWCNT. A finite element method (FEM) previously presented ... Keywords: Finite element method, Mechanical properties, Single-walled carbon nanotubes

Cho W. S. To

2006-02-01T23:59:59.000Z

271

The Effect of Current Shear on Topographic Rossby Waves  

Science Conference Proceedings (OSTI)

Topographic Rossby waves are long-period waves which occur on continental slopes. In this paper we examine the effect of a mean current on these waves, when the current is directed along the isobaths and has a linear shear in the transverse ...

I. L. Collings; R. Grimshaw

1980-03-01T23:59:59.000Z

272

Application of Short-Range Lidar in Wind Shear Alerting  

Science Conference Proceedings (OSTI)

Long-range lidar systems have been used operationally at the Hong Kong International Airport for wind shear alerting. They are used for monitoring the headwinds over the last 3 n mi of all of the runway corridors of the Hong Kong International ...

P. W. Chan; Y. F. Lee

2012-02-01T23:59:59.000Z

273

Wind shear climatology for large wind turbine generators  

DOE Green Energy (OSTI)

Climatological wind shear analyses relevant to the design and operation of multimegawatt wind turbines are provided. Insight is provided for relating the wind experienced by a rotating blade in a shear flow to the analysis results. A simple analysis of the wind experienced by a rotating blade for three types of wind shear profiles under steady-state conditions is presented in graphical form. Comparisons of the magnitude and frequency of the variations in 1) the wind sensed by a single blade element, 2) the sum, and 3) the difference of the winds sensed by opposite blade elements show strong sensitivity to profile shape. These three items represent forcing functions that can be related to 1) flatwise bending moment, 2) torque on the shaft, and 3) teeter angle. A computer model was constructed to simulate rotational sampling of 10-s sampled winds from a tall tower for three different types of large wind turbines. Time series produced by the model indicated that the forcing functions on a rotating blade vary according to the shear profile encountered during each revolution as opposed to a profile derived from average wind conditions, e.g., hourly average winds. An analysis scheme was developed to establish a climatology of wind shear profiles derived from 10-s sampled winds and hourly average winds measured over a one-year period at several levels on a tall tower. Because of the sensitivity of the forcing function variability to profile shape, the analyses performed and presented are in the form of joint frequency distributions of velocity differences of the the top-to-hub versus the hub-to-bottom portion of disks of rotation for the three turbine configurations.

Elliott, D.L.; Wendell, L.L.; Heflick, S.K.

1982-10-01T23:59:59.000Z

274

Cloud-Environment Interface Instability. Part III: Direct Influence of Environmental Shear  

Science Conference Proceedings (OSTI)

The direct effect of vertical shear of the horizontal wind for the unperturbed environment on the cloud-environment interface instability is investigated. Results indicate that the direct influence of environmental shear typical of atmospheric ...

Wojciech W. Grabowski; Terry L. Clark

1993-12-01T23:59:59.000Z

275

Instability and Diapycnal Momentum Transport in a Double-Diffusive, Stratified Shear Layer  

Science Conference Proceedings (OSTI)

The linear stability of a double-diffusively stratified, inflectional shear flow is investigated. Double-diffusive stratification has little effect on shear instability except when the density ratio R? is close to unity. Double-diffusive ...

William D. Smyth; Satoshi Kimura

2007-06-01T23:59:59.000Z

276

Turbulence in a Sheared, Salt-Fingering-Favorable Environment: Anisotropy and Effective Diffusivities  

Science Conference Proceedings (OSTI)

Direct numerical simulations (DNS) of a shear layer with salt-fingering-favorable stratification have been performed for different Richardson numbers Ri and density ratios R?. In the absence of shear (Ri = ?), the primary instability is square ...

Satoshi Kimura; William Smyth; Eric Kunze

2011-06-01T23:59:59.000Z

277

Recognizing Low-Altitude Wind Shear Hazards from Doppler Weather Radar: An Artificial Intelligence Approach  

Science Conference Proceedings (OSTI)

This paper describes an artificial intelligence-based approach for automated recognition of wind shear hazards. The design of a prototype system for recognizing low-attitude wind shear events from Doppler radar displays is presented. This system, ...

Steven D. Campbell; Stephen H. Olson

1987-03-01T23:59:59.000Z

278

The Dependence of Numerically Simulated Convective Storms on Vertical Wind Shear and Buoyancy  

Science Conference Proceedings (OSTI)

The effects of vertical wind shear and buoyancy on convective storm structure and evolution are investigated with the use of a three-dimensional numerical cloud model. By varying the magnitude of buoyant energy and one-directional vertical shear ...

M. L. Weisman; J. B. Klemp

1982-06-01T23:59:59.000Z

279

Three-Dimensional Response of a Shear Flow to Elevated Heating  

Science Conference Proceedings (OSTI)

The three-dimensional response of a shear flow to elevated heating is investigated using linear theory. The basic wind profile is allowed to reverse directions at a certain height. Effects of shear, evaporative cooling, and the stratosphere are ...

Yuh-Lang Lin; Shiaolin Li

1988-10-01T23:59:59.000Z

280

On the Forcing Mechanisms Affecting the Bottom Shear Stress in Coastal Waters  

Science Conference Proceedings (OSTI)

Three papers have appeared in the literature in the past four years which report current data indicating that the bottom shear stress is larger than the surface shear stress. The sites involved in the three studies had many similarities including ...

Cortis Cooper; Bryan Pearce

1980-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Dynamics of Sheared Convective Boundary Layer Entrainment. Part I: Methodological Background and Large-Eddy Simulations  

Science Conference Proceedings (OSTI)

The reported study examines the dynamics of entrainment and its effects on the evolution of the dry atmospheric convective boundary layer (CBL) when wind shear is present. The sheared CBL can be studied by means of direct measurements in the ...

Robert J. Conzemius; Evgeni Fedorovich

2006-04-01T23:59:59.000Z

282

Tropospheric Wind Shear Oscillations as a Characteristic of the Southwest Monsoon Atmosphere  

Science Conference Proceedings (OSTI)

In earlier papers it was shown that tropospheric vertical wind shear in the layer 850–200 mb decreases appreciably prior to formation of depressions in the Indian summer monsoon area. Further analysis reveals that this decrease in shear stems ...

C. R. V. Raman; Y. P. Rao; S. K. Subramanian; Jose A. Maliekal

1981-04-01T23:59:59.000Z

283

Statistics of Shear and Turbulent Dissipation Profiles in Random Internal Wave Fields  

Science Conference Proceedings (OSTI)

Because breaking internal waves produces most of the turbulence in the thermocline, the statistics of ?, the rate of turbulent dissipation, cannot be understood apart from the statistics of internal wave shear. The statistics of ? and shear are ...

M. C. Gregg; H. E. Seim; D. B. Percival

1993-08-01T23:59:59.000Z

284

Generalized Stability of Nongeostrophic Baroclinic Shear Flow. Part II: Intermediate Richardson Number Regime  

Science Conference Proceedings (OSTI)

This work continues the generalized stability theory (GST) analysis of baroclinic shear flow in the primitive equations (PE), focusing on the regime in which the mean baroclinic shear and the stratification are of the same order. The Eady model ...

Eyal Heifetz; Brian F. Farrell

2007-12-01T23:59:59.000Z

285

A Comparison of Tropical and Midlatitude Thunderstorm Evolution in Response to Wind Shear  

Science Conference Proceedings (OSTI)

The influence of vertical wind shear on storm development within a tropical environment is studied with the aid of two numerical models and compared with that in simulations of midlatitude storms. The simulations show that larger wind shears are ...

Ulrike Wissmeier; Robert Goler

2009-08-01T23:59:59.000Z

286

Tornado Detection Using a Neuro–Fuzzy System to Integrate Shear and Spectral Signatures  

Science Conference Proceedings (OSTI)

Tornado vortices observed from Doppler radars are often associated with strong azimuthal shear and Doppler spectra that are wide and flattened. The current operational tornado detection algorithm (TDA) primarily searches for shear signatures that ...

Yadong Wang; Tian-You Yu; Mark Yeary; Alan Shapiro; Shamim Nemati; Michael Foster; David L. Andra Jr.; Michael Jain

2008-07-01T23:59:59.000Z

287

A Comparison of Shear- and Buoyancy-Driven Planetary Boundary Layer Flows  

Science Conference Proceedings (OSTI)

Planetary boundary layer (PBL) flows are known to exhibit fundamental differences depending on the relative combination of wind shear and buoyancy forces. These differences are not unexpected in that shear instabilities occur locally, while ...

Chin-Hoh Moeng; Peter P. Sullivan

1994-04-01T23:59:59.000Z

288

Estimating Undrained Strength of Clays from Direct Shear Testing at Fast Displacement Rates  

E-Print Network (OSTI)

and Germaine, J.T. (1996), “Rate-dependent undrained shearTesting at Fast Displacement Rates Andrew D. Bro 1 , M.variable shear displacement rates on specimens composed of

Bro, Andrew D; Stewart, Jonathan P; Pradel, Daniel E

2013-01-01T23:59:59.000Z

289

Mixed-Layer Shear Generated by Wind Stress in the Central Equatorial Pacific  

Science Conference Proceedings (OSTI)

Sixteen months of wind and current profile observations in the central equatorial Pacific show the response of the upper-ocean shear to local wind forcing. The shear at the ocean surface is significantly correlated with the wind stress in ...

Fernando Santiago-Mandujano; Eric Firing

1990-10-01T23:59:59.000Z

290

Two U.S. University Research Reactors to be Converted From Highly...  

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

are here Home Two U.S. University Research Reactors to be Converted From Highly Enriched Uranium to Low-Enriched Uranium Two U.S. University Research Reactors to be Converted...

291

Blind calibration of timing skew in time-interleaved analog-to-digital converters  

E-Print Network (OSTI)

The performance of time-interleaved analog-to-digital converters is often significantly degraded by timing mismatch errors. We develop methods for performing blind calibration of such converters, i.e., for estimating the ...

Divi, Vijay

292

Design and characterization of a radio-frequency dc/dc power converter  

E-Print Network (OSTI)

The use of radio-frequency (RF) amplifier topologies in dc/dc power converters allows the operating frequency to be increased by more than two orders of magnitude over the frequency of conventional converters. This enables ...

Jackson, David A. (David Alexander)

2005-01-01T23:59:59.000Z

293

Efficient CFRP Strap Configurations for the Shear Strengthening of Reinforced Concrete T-Beams  

E-Print Network (OSTI)

2 – Specimen capacities Specimen fcu, (MPa) Ultimate Shear Force (kN) Percentage Increase versus B1/25 Maximum Mid- span Deflection (mm) Failure Mode B1/25 24.8 88.2 - 15.5 Shear in Concrete B2/45/H/20 19.8 95.4 8.2 15.6 Shear in Concrete...

Hoult, N. A.; Lees, J. M.

2012-02-27T23:59:59.000Z

294

Free magnetohydrodynamic shear layers in the presence of rotation and magnetic fielda)  

E-Print Network (OSTI)

Free magnetohydrodynamic shear layers in the presence of rotation and magnetic fielda) E. J. Spence and numerical study of hydrodynamic and magnetohydrodynamic free shear layers and their stability. We first typically reach zero velocity at the bounding wall. A shear layer is called "free" when it exists

Ji, Hantao

295

A Decentralized Protection Scheme for Converters Utilizing a DC-link Inductor  

E-Print Network (OSTI)

, and B. Ooi. Force commutated HVDC and SVC based on phase-shifted multi-converter modules. IEEE Trans

Lipo, Thomas

296

Custom DC-DC converters for distributing power in SLHC trackers  

E-Print Network (OSTI)

A power distribution scheme based on the use of on-board DC-DC converters is proposed to efficiently distribute power to the on-detector electronics of SLHC trackers. A comparative analysis of different promising converter topologies is presented, leading to the choice of a magneticbased buck converter as a first conversion stage followed by an on-chip switched capacitors converter. An overall efficiency above 80% is estimated for the practical implementation proposed.

Allongue, B; Blanchot, G; Faccio, F; Fuentes, C; Mattavelli, P; Michelis, S; Orlandis, S; Spiazzi, G

2008-01-01T23:59:59.000Z

297

The effect of time of shearing on wool production and management of a spring-lambing merino flock.  

E-Print Network (OSTI)

??No shearing time consistently improved all animal health measures. May-shorn ewes had significantly more fleece rot in late autumn than the other shearing groups (odds… (more)

Campbell, Angus

2006-01-01T23:59:59.000Z

298

Light-weight DC to very high voltage DC converter  

DOE Patents (OSTI)

A DC-DC converter capable of generating outputs of 100 KV without a transformer comprises a silicon opening switch (SOS) diode connected to allow a charging current from a capacitor to flow into an inductor. When a specified amount of charge has flowed through the SOS diode, it opens up abruptly; and the consequential collapsing field of the inductor causes a voltage and current reversal that is steered into a load capacitor by an output diode. A switch across the series combination of the capacitor, inductor, and SOS diode closes to periodically reset the SOS diode by inducing a forward-biased current.

Druce, Robert L. (Union City, CA); Kirbie, Hugh C. (Dublin, CA); Newton, Mark A. (Livermore, CA)

1998-01-01T23:59:59.000Z

299

Light-weight DC to very high voltage DC converter  

DOE Patents (OSTI)

A DC-DC converter capable of generating outputs of 100 KV without a transformer comprises a silicon opening switch (SOS) diode connected to allow a charging current from a capacitor to flow into an inductor. When a specified amount of charge has flowed through the SOS diode, it opens up abruptly; and the consequential collapsing field of the inductor causes a voltage and current reversal that is steered into a load capacitor by an output diode. A switch across the series combination of the capacitor, inductor, and SOS diode closes to periodically reset the SOS diode by inducing a forward-biased current. 1 fig.

Druce, R.L.; Kirbie, H.C.; Newton, M.A.

1998-06-30T23:59:59.000Z

300

Harmonic measurements from a group connected generator HVdc converter scheme  

SciTech Connect

A recent CIGRE document published in ELECTRA has described the potential benefits of a direct connection of generators to HVdc converters. While many theoretical contributions have been made, no practical test data has become available so far. This paper reports on harmonic tests carried out at the Benmore end of the New Zealand HVdc link operating as a group connected scheme. It was found that the measured harmonic current levels were well below specified generator ratings. Dynamic simulation accurately predicted the harmonic currents whereas the results of a steady state formulation were less reliable.

Macdonald, S.J.; Enright, W.; Arrillaga, J. [Univ. of Canterbury, Christchurch (New Zealand); O`Brien, M.T.

1995-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Bi-Directional DC-DC Converter for PHEV Applications  

DOE Green Energy (OSTI)

Plug-In Hybrid Electric Vehicles (PHEV) require high power density energy storage system (ESS) for hybrid operation and high energy density ESS for Electric Vehicle (EV) mode range. However, ESS technologies to maximize power density and energy density simultaneously are not commercially feasible. The use of bi-directional DC-DC converter allows use of multiple energy storage, and the flexible DC-link voltages can enhance the system efficiency and reduce component sizing. This will improve fuel consumption, increase the EV mode range, reduce the total weight, reduce battery initial and life cycle cost, and provide flexibility in system design.

Abas Goodarzi

2011-01-31T23:59:59.000Z

302

Fast-scale bifurcation . . . converters and effects of incompatible periodicities  

E-Print Network (OSTI)

In this paper, we derive the discrete-time model for the power-factor-correction (PFC) buck-boost converter in terms of a stroboscopic switching map. Fast-scale instability is analysed through a fold diagram, which exposes the periodicity of the operation as well as the locations of the critical phase angles of the line voltage at which instability begins to occur along a half-line cycle. The asymmetrical locations of the critical phase angles along a half-line cycle is explained in terms of ‘underdeveloped’ bifurcation. Border collision bifurcations are observed and analysed in detail.

Jianlong Zou; Xikui Ma; Chi K. Tse; Dong Dai

2006-01-01T23:59:59.000Z

303

dc-to-ac power converter for fuel cell system  

SciTech Connect

As the interface between fuel cells and the utility line, a self-commutated inverter is preferred to a line-commutated inverter because of its easy controllability. Using the gate turn off (GTO) thyristors, this inverter can have high efficiency and simple circuit configurations. This paper describes the design features and test results of the dc-to-ac power converter, which is principally composed of four-phase transistor chopper and 12-pulse GTO inverter, for a 50kW experimental fuel cell power system. Furthermore, new GTO inverter which improves the circuit efficiency is presented. Special emphasis is placed on a detailed analysis and evaluation of this GTO inverter.

Kawabata, T.; Asaeda, T.; Hamasaki, Y.; Yutani, T.

1983-10-01T23:59:59.000Z

304

A new arrangement of AC/DC converters for high direct-current applications  

Science Conference Proceedings (OSTI)

A novel AC/DC converter designed for high-output direct currents and tight output voltage regulations is introduced. The proposed converter exhibits good efficiency and very low output voltage ripple. In order to verify the performances of the four-stage ... Keywords: AC/DC converter, FFT, electrical distribution systems, high direct-current

Francesco Muzi; Luigi Passacantando

2008-04-01T23:59:59.000Z

305

Multi-Stage Converters: A New Technology for Traction Drive Juan W. Dixon  

E-Print Network (OSTI)

of this drive is that the switching frequency of the Main converter is at the fundamental frequency, reducing will be the Slaves. The Main Converter works at the lower switching frequency (fundamental frequency), which, and A. Tahri, "Multilevel Converters and VAR Compensation", Chapter 25, Power Electronics Handbook

Rudnick, Hugh

306

Microgrid Power Electronic Converters: State of the Art and Future Challenges  

E-Print Network (OSTI)

Microgrid Power Electronic Converters: State of the Art and Future Challenges M. Jamil, B. Hussain converters used in microgrids. The paper focuses primarily on grid connected converters. Different topologies as they are variable in nature. Distributed generators (DG), including renewable sources, within microgrids can help

307

Triaxial determination of shear strength of tire chips  

Science Conference Proceedings (OSTI)

Triaxial compression tests following stress paths of constant {sigma}{sub 1} were conducted to determine the shear strength of five processed scrap tire products having different gradations and particle shapes. The interparticle frictional component was separated from the total shear strength according to the energy correction concept proposed by researchers. The experimental results show that all five tire chip products have ultimate internal friction angles of 45{degree} to over 60{degree}. The interparticle frictional component of the strength was fully mobilized and nearly reached a constant value after approximately 5% axial strain. The experimental results confirmed that the strength parameter obtained with constant {sigma}{sub 1} was more reasonable. This finding is supported by field observation in which the tire chips have an angle of repose ranging from 37{degree} to 43{degree} (loosely stock piled) and up to 85{degree} (compacted). The engineering applications of the experimental results are discussed.

Wu, W.Y.; Benda, C.C.; Cauley, R.F. [Vermont Agency of Transportation, Montpelier, VT (United States)

1997-05-01T23:59:59.000Z

308

Oscillatory motion of sheared nanorods beyond the nematic phase  

E-Print Network (OSTI)

We study the role of the control parameter triggering nematic order (temperature or concentration) on the dynamical behavior of a system of nanorods under shear. Our study is based on a set of mesoscopic equations of motion for the components of the tensorial orientational order parameter. We investigating these equations via a systematic bifurcation analysis based on a numerical continuation technique, focusing on spatially homogeneous states. Exploring a wide range of parameters we find, unexpectedly, that states with oscillatory motion can exist even under conditions where the equilibrium system is isotropic. These oscillatory states are characterized by wagging motion of the paranematic director, and they occur if the tumbling parameter is sufficiently small. We also present full non-equilibrium phase diagrams, in the plane spanned by the concentration and the shear rate.

David A. Strehober; Harald Engel; Sabine H. L. Klapp

2013-04-03T23:59:59.000Z

309

Mechanochromism, Shear Force Anisotropy, and Molecular Mechanics in Polydiacetylene Monolayers  

SciTech Connect

The authors use scanning probe microscopy to actuate and characterize the nanoscale mechanochromism of polydiacetylene monolayer on atomically-flat silicon oxide substrates. They find explicit evidence that the irreversible blue-to-red transformation is caused by shear forces exerted normal to the polydiacetylene polymer backbone. The anisotropic probe-induced transformation is characterized by a significant change in the tilt orientation of the side chains with respect to the surface normal. They also describe a new technique, based on shear force microscopy, that allows them to image friction anisotropy of polydiacetylene monolayer independent of scan direction. Finally, they discuss preliminary molecular mechanics modeling and electronic structure calculations that allow them to understand the correlation of mechanochromism with bond-angle changes in the conjugated polymer backbone.

BURNS,ALAN R.; CARPICK,R.W.; SASAKI,DARRYL Y.; SHELNUTT,JOHN A.; HADDAD,R.

2000-08-14T23:59:59.000Z

310

SHEAR STRENGTH MEASURING EQUIPMENT EVALUATION AT THE COLD TEST FACILITY  

SciTech Connect

Retrievals under current criteria require that approximately 2,000,000 gallons of double-shell tank (DST) waste storage space not be used to prevent creating new tanks that might be susceptible to buoyant displacement gas release events (BDGRE). New criteria are being evaluated, based on actual sludge properties, to potentially show that sludge wastes do not exhibit the same BDGRE risk. Implementation of the new criteria requires measurement of in situ waste shear strength. Cone penetrometers were judged the best equipment for measuring in situ shear strength and an A.P. van den berg Hyson 100 kN Light Weight Cone Penetrometer (CPT) was selected for evaluation. The CPT was procured and then evaluated at the Hanford Site Cold Test Facility. Evaluation demonstrated that the equipment with minor modification was suitable for use in Tank Farms.

MEACHAM JE

2009-09-09T23:59:59.000Z

311

Thermal Conductivity and Shear Strength of K Basin Sludge  

DOE Green Energy (OSTI)

Hanford K Basin sludge contains metallic uranium and uranium oxides that will corrode, hydrate, and, consequently, generate heat and hydrogen gas during storage. Heat is generated within the K Basin sludge by radiolytic decay and the reaction of uranium metal with water. To maintain thermal stability, the sludge must be retrieved, staged, transported, and stored in systems designed to provide a rate of heat removal that prevents the temperature in the sludge from increasing beyond acceptable limits. To support the dispositioning of the sludge to T Plant, modeling and testing and analyses are being performed to predict the behavior of sludge when placed into the storage containers. Two physical properties of the sludge that are critical to the modeling and analyses efforts are thermal conductivity and the sludge shear strength (yield stress). This report provides the results of thermal conductivity and shear strength measurements performed on representative sludge samples from the K East Basin.

Poloski, Adam P. (BATTELLE (PACIFIC NW LAB)); Bredt, Paul R. (BATTELLE (PACIFIC NW LAB)); Schmidt, Andrew J. (BATTELLE (PACIFIC NW LAB)); Swoboda, Robert G. (BATTELLE (PACIFIC NW LAB)); Chenault, Jeffrey W. (BATTELLE (PACIFIC NW LAB)); Gano, Sue (BATTELLE (PACIFIC NW LAB))

2002-05-17T23:59:59.000Z

312

Evolution of shear-induced melting in dusty plasma  

E-Print Network (OSTI)

The spatiotemporal development of melting is studied experimentally in a 2D dusty plasma suspension. Starting with an ordered lattice, and then suddenly applying localized shear, a pair of counter-propagating flow regions develop. A transition between two melting stages is observed before a steady state is reached. Melting spreads with a front that propagates at the transverse sound speed. Unexpectedly, coherent longitudinal waves are excited in the flow region.

Yan Feng; J. Goree; Bin Liu

2010-04-05T23:59:59.000Z

313

Electrical Conduction, Heat Conduction, Shear Viscosity and Entropy  

E-Print Network (OSTI)

We present here how to study steady linear transport phenomena by using entropy. We study the system and the environment together and identify their entropies. Concerning their interaction, quantum mechanics is considered. A time parameter $\\tau$ is therefore introduced to characterize the discrete nature of the quantum interactions. By combining $\\tau$ and the entropy, an approach is constructed successfully to study electrical conduction, heat conduction and shear viscosity

Zhang, Yong-Jun

2010-01-01T23:59:59.000Z

314

Triple voltage dc-to-dc converter and method  

DOE Patents (OSTI)

A circuit and method of providing three dc voltage buses and transforming power between a low voltage dc converter and a high voltage dc converter, by coupling a primary dc power circuit and a secondary dc power circuit through an isolation transformer; providing the gating signals to power semiconductor switches in the primary and secondary circuits to control power flow between the primary and secondary circuits and by controlling a phase shift between the primary voltage and the secondary voltage. The primary dc power circuit and the secondary dc power circuit each further comprising at least two tank capacitances arranged in series as a tank leg, at least two resonant switching devices arranged in series with each other and arranged in parallel with the tank leg, and at least one voltage source arranged in parallel with the tank leg and the resonant switching devices, said resonant switching devices including power semiconductor switches that are operated by gating signals. Additional embodiments having a center-tapped battery on the low voltage side and a plurality of modules on both the low voltage side and the high voltage side are also disclosed for the purpose of reducing ripple current and for reducing the size of the components.

Su, Gui-Jia (Knoxville, TN)

2008-08-05T23:59:59.000Z

315

EMISSIONS REDUCTIONS USING HYDROGEN FROM PLASMATRON FUEL CONVERTERS  

DOE Green Energy (OSTI)

Substantial progress in engine emission control is needed in order to meet present and proposed regulations for both spark ignition and diesel engines. Tightening regulations throughout the world reflect the ongoing concern with vehicle emissions. Recently developed compact plasmatron fuel converters have features that are suitable for onboard production of hydrogen for both fuel pretreatment and for exhaust aftertreatment applications. Systems that make use of these devices in conjunction with aftertreatment catalysts have the potential to improve significantly prospects for reduction of diesel engine emissions. Plasmatron fuel converters can provide a rapid response compact means to transform efficiently a wide range of hydrocarbon fuels into hydrogen rich gas. They have been used to reform natural gas [Bromberg1], gasoline [Green], diesel [Bromberg2] and hard-to-reform biofuels [Cohn1] into hydrogen rich gas (H2 + CO). The development of these devices has been pursued for the purpose of reducing engine exhaust pollutants by providing hydrogen rich gas for combustion in spark ignition and possibly diesel engines, as shown in Figure 1 [Cohn2]. Recent developments in compact plasmatron reformer design at MIT have resulted in substantial decreases in electrical power requirements. These new developments also increase the lifetime of the electrodes.

Bromberg, L

2000-08-20T23:59:59.000Z

316

MAGNETIC FIELD GENERATION AND PARTICLE ENERGIZATION AT RELATIVISTIC SHEAR BOUNDARIES IN COLLISIONLESS ELECTRON-POSITRON PLASMAS  

SciTech Connect

Using particle-in-cell simulations, we study the kinetic physics of relativistic shear flow in collisionless electron-positron (e+e-) plasmas. We find efficient magnetic field generation and particle energization at the shear boundary, driven by streaming instabilities across the shear interface and sustained by the shear flow. Nonthermal, anisotropic high-energy particles are accelerated across field lines to produce a power-law tail turning over just below the shear Lorentz factor. These results have important implications for the dissipation and radiation of jets in blazars and gamma-ray bursts.

Liang, Edison; Smith, Ian [Rice University, MS 108, 6100 Main Street, Houston, TX 77005 (United States); Boettcher, Markus, E-mail: liang@rice.edu, E-mail: iansmith@rice.edu, E-mail: boettchm@ohio.edu [Physics and Astronomy Department, Ohio University, Athens, OH 45701 (United States)

2013-04-01T23:59:59.000Z

317

Anisotropic shear melting and recrystallization of a two-dimensional complex (dusty) plasma  

E-Print Network (OSTI)

A two-dimensional plasma crystal was melted by suddenly applying localized shear stress. A stripe of particles in the crystal was pushed by the radiation pressure force of a laser beam. We found that the response of the plasma crystal to stress and the eventual shear melting depended strongly on the crystal's angular orientation relative to the laser beam. Shear stress and strain rate were measured, from which the spatially resolved shear viscosity was calculated. The latter was shown to have minima in the regions with high velocity shear, thus demonstrating shear thinning. Shear-induced reordering was observed in the steady-state flow, where particles formed strings aligned in the flow direction.

V. Nosenko; A. V. Ivlev; G. E. Morfill

2013-01-28T23:59:59.000Z

318

NETL: News Release - Converting Coal Wastes to Clean Energy  

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

November 28, 2000 November 28, 2000 Converting Coal Wastes to Clean Energy DOE to Scale Up 3 Projects That Upgrade Coal Fines, Wastes PITTSBURGH, PA - Three new technologies that can help the nation's coal industry turn waste into energy are now ready for scale up, the U.S. Department of Energy said today. MORE INFO Solid Fuels & Feedstocks Program Each of the three recover carbon-rich materials that in the past have been discarded during coal mining and cleaning operations. Using innovative approaches, the technologies remove unwanted water and other impurities and upgrade the waste materials into clean-burning fuels for power plants. The three were first selected for smaller-scale research in August 1998 as part of the Energy Department's Fossil Energy "solid fuels and feedstocks"

319

Neutronic design studies for the MIT fission converter beam  

SciTech Connect

Currently available epithermal neutron beams at the Massachusetts Institute of Technology (MIT) are not sufficiently intense to meet the anticipated demand for boron neutron capture therapy (BNCT) treatments if initial, currently in progress clinical trials of BNCT prove successful. Indeed, they are not really adequate for extensive (phase-III) clinical trials. To fulfill this need, a high-intensity, high-quality fission converter-based epithermal neutron beam for BNCT has been designed for the MIT Research Reactor, (MITR-II). This epithermal neutron beam, capable of delivering treatments in a few minutes with negligible beam background contamination, would be installed in the present thermal column and hohlraum of the MITR-II.

Kiger, W.S. III; Harling, O.K. [Massachusetts Inst. of Technology, Cambridge, MA (United States)

1996-12-31T23:59:59.000Z

320

A Study of Radiative Bottomonium Transitions using Converted Photons  

SciTech Connect

The authors use (111 {+-} 1) million {Upsilon}(3S) and (89 {+-} 1) million {Upsilon}(2S) events recorded by the BABAR detector at the PEP-II B-factory at SLAC to perform a study of radiative transitions betwen bottomonium states using photons that have been converted to e{sup +}e{sup -} pairs by the detector material. They observe {Upsilon}(3S) {yields} {gamma}{chi}{sub b0,2}(1P) decay, make precise measurements of the branching fractions for {chi}{sub b1,2}(1P, 2P) {yields} {gamma}{Upsilon}(1S) and {chi}{sub b1,2}(2P) {yields} {gamma}{Upsilon}(2S) decays, and search for radiative decay to the {eta}{sub b}(1S) and {eta}{sub b}(2S) states.

Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; /INFN, Bari /Bari U.; Milanes, D.A.; /INFN, Bari; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum; Asgeirsson, D.J.; Hearty, C.; /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas Nuclear Corp., Austin /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Low Head, Vortex Induced Vibrations River Energy Converter  

DOE Green Energy (OSTI)

Vortex Induced Vibrations Aquatic Clean Energy (VIVACE) is a novel, demonstrated approach to extracting energy from water currents. This invention is based on a phenomenon called Vortex Induced Vibrations (VIV), which was first observed by Leonardo da Vinci in 1504AD. He called it ‘Aeolian Tones.’ For decades, engineers have attempted to prevent this type of vibration from damaging structures, such as offshore platforms, nuclear fuel rods, cables, buildings, and bridges. The underlying concept of the VIVACE Converter is the following: Strengthen rather than spoil vortex shedding; enhance rather than suppress VIV; harness rather than mitigate VIV energy. By maximizing and utilizing this unique phenomenon, VIVACE takes this “problem” and successfully transforms it into a valuable resource for mankind.

Bernitsas, Michael B.; Dritz, Tad

2006-06-30T23:59:59.000Z

322

Fluoride-containing wastewater converted to synthetic fluorspar  

Science Conference Proceedings (OSTI)

In the manufacture of uranium hexafluoride, sulfur hexafluoride, iodine pentafluoride, and antimony pentafluoride, the Allied Corporation's Metropolis Works (Metropolis, IL) generates approximately 250,000 gpd of process wastewater which contains substantial amounts of soluble fluoride. Most of the wastewater is also acidic. Alkaline waste and hydrated lime (calcium hydroxide) in a pair of neutralizers are used to precipitate the soluble fluoride as calcium fluoride. Due to the alkalinity, the material is considered a hazardous waste. The limited availability of land suitable for the construction of impoundment basins and the potential for eventual seepage from the basins presented a challenge to the management and technical staff at the Metropolis Works situation on-site. Efforts were directed toward developing a process to convert the calcium fluoride waste into a useful product. Excess lime waste could be converted to 90% CaF/sub 2/ by neutralizing the lime with hydrofluoric acid. The 90% CaF/sub 2/, closely resembling fluorspar, would be able to be used directly at other Allied plants as a substitute for natural fluorspar in the production of anhydrous hydrofluoric (AHF) acid. Engineering efforts to design a full-scale plant for the recovery of CaF/sub 2/ began in mid-1980. Construction of the plant begin in July, 1981. Since startup in mid-1982, the full scale recovery plant has been in continuous operation. Design capacity is 8000 tons/yr of synthetic fluorspar. The synthetic fluorspar is directly replacing an equivalent amount of imported natural fluorspar in the production of anhydrous hydrofluoric acid. Total cost to construct the CaF/sub 2/ recovery plant was $4.3 million. Currently realized cost savings of about $1 million/yr give the project an expected payback period of under five years.

Cipolla, A.J.; Shields, E.J.; Wickersham, C.P.; Toy, D.A.

1985-11-01T23:59:59.000Z

323

Evaluation of Wind Shear Patterns at Midwest Wind Energy Facilities: Preprint  

DOE Green Energy (OSTI)

The U.S. Department of Energy-Electric Power Research Institute (DOE-EPRI) Wind Turbine Verification Program (TVP) has included several wind energy facilities in the Midwestern United States. At several of these projects, a strong diurnal shear pattern has been observed. During the day, low and sometimes negative shear has been measured. During night hours, very high positive shear is frequently observed. These high nighttime shear values are of concern due to the potential for high stresses across the rotor. The resulting loads on turbine components could result in failures. Conversely, the effects of high nighttime wind shear could benefit wind generated energy production in the Midwest by providing a source of greater hub-height wind speeds, particularly for multi-megawatt turbines that utilize tall towers. This paper presents an overview of the observed wind shear at each of the Midwest TVP projects, focusing on diurnal patterns and the frequency of very high nighttime shear at the sites. Turbine fault incidence is examined to determine the presence or absence of a correlation to periods of high shear. Implications of shear-related failures are discussed for other Midwest projects that use megawatt-scale turbines. In addition, this paper discusses the importance of accurate shear estimates for project development.

Smith, K.; Randall, G.; Malcolm, D.; Kelley, N.; Smith, B.

2002-05-01T23:59:59.000Z

324

New shear-free relativistic models with heat flow  

E-Print Network (OSTI)

We study shear-free spherically symmetric relativistic models with heat flow. Our analysis is based on Lie's theory of extended groups applied to the governing field equations. In particular, we generate a five-parameter family of transformations which enables us to map existing solutions to new solutions. All known solutions of Einstein equations with heat flow can therefore produce infinite families of new solutions. In addition, we provide two new classes of solutions utilising the Lie infinitesimal generators. These solutions generate an infinite class of solutions given any one of the two unknown metric functions.

A. M. Msomi; K. S. Govinder; S. D. Maharaj

2012-12-29T23:59:59.000Z

325

Electron Trapping in Shear Alfven Waves that Power the Aurora  

Science Conference Proceedings (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth's geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfven waves, preventing immediate wave damping. As waves move to regions with larger v{sub Te}/v{sub A}, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfven waves and electrons that form aurora.

Watt, Clare E. J.; Rankin, Robert [University of Alberta, Edmonton, Alberta (Canada)

2009-01-30T23:59:59.000Z

326

U-120: RSA SecurID Software Token Converter Unspecified Buffer Overflow  

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

0: RSA SecurID Software Token Converter Unspecified Buffer 0: RSA SecurID Software Token Converter Unspecified Buffer Overflow Vulnerability U-120: RSA SecurID Software Token Converter Unspecified Buffer Overflow Vulnerability March 8, 2012 - 7:00am Addthis PROBLEM: RSA SecurID Software Token Converter Unspecified Buffer Overflow Vulnerability PLATFORM: RSA SecurID Software Token Converter 2.x ABSTRACT: Successful exploitation may allow execution of arbitrary code. reference LINKS: Secunia Advisory SA48297 CVE-2012-0397 IMPACT ASSESSMENT: High Discussion: A vulnerability has been reported in RSA SecurID Software Token Converter, which can be exploited by malicious people to compromise a user's system. Impact: An unspecified error can be exploited to cause a buffer overflow. Solution: Update to version 2.6.1. Addthis Related Articles

327

MHK Technologies/Oceanlinx Mark 3 Wave Energy Converter | Open Energy  

Open Energy Info (EERE)

Oceanlinx Mark 3 Wave Energy Converter Oceanlinx Mark 3 Wave Energy Converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Oceanlinx Mark 3 Wave Energy Converter.jpg Technology Profile Primary Organization Oceanlinx Project(s) where this technology is utilized *MHK Projects/GPP Namibia *MHK Projects/Greenwave Rhode Island Ocean Wave Energy Project *MHK Projects/Hawaii *MHK Projects/Oceanlinx Maui *MHK Projects/Port Kembla *MHK Projects/Portland Technology Resource Click here Wave Technology Type Click here Oscillating Water Column Technology Readiness Level Click here TRL 5/6: System Integration and Technology Laboratory Demonstration Technology Description The Oceanlinx Mark 3 Wave Energy Converter is a floating multi Oscilating Water Chamber Wave Energy Converter. The airflow generated by the OWC passes through a patented Denniss Auld turbine which converts the bidirectional airflow of the OWC to a unidirectional rotation of the axial flow turbine which in turn drives a generator.

328

An Integrated Onboard Charger and Accessary Power Converter for Plug-in Electric Vehicles  

SciTech Connect

Abstract: In this paper, an integrated onboard battery charger and accessary dc-dc converter for plug-in electric vehicles (PEVs) is presented. The idea is to utilize the already available traction drive inverters and motors of a PEV as the frond converter of the charger circuit and the transformer of the 14 V accessary dc-dc converter to provide galvanic isolation. The topology was verified by modeling and experimental results on a 5 kW charger prototype

Su, Gui-Jia [ORNL; Tang, Lixin [ORNL

2013-01-01T23:59:59.000Z

329

Design and characterization of a 0.35 micron CMOS voltage-to-current converter  

Science Conference Proceedings (OSTI)

This work presents the design and characterization of a CMOS voltage-to-current (V-I) converter with a current range from -100 ?A to 100 ?A. The V-I converter has a power consumption of approximately 0.6 mW and its final area was 0.022 mm2 ... Keywords: current reference, system on chip, voltage-to-current converter

Genival Mariano de Araujo; Heider Marconi G. Madureira; José Camargo da Costa

2009-08-01T23:59:59.000Z

330

Wind shear for large wind turbine generators at selected tall tower sites  

DOE Green Energy (OSTI)

The objective of the study described in this report is to examine the nature of wind shear profiles and their variability over the height of large horizontal-axis wind turbines and to provide information on wind shear relevant to the design and opertion of large wind turbines. Wind turbine fatigue life and power quality are related through the forcing functions on the blade to the shapes of the wind shear profiles and their fluctuations over the disk of rotation.

Elliott, D.L.

1984-04-01T23:59:59.000Z

331

Cosmic shear from STIS Pure Parallels I Data  

E-Print Network (OSTI)

Following the second HST servicing mission in 1997 when the STIS instrument was installed and the capability for parallel observations was enhanced, a substantial archive of non-proprietary parallel data have been accumulating. In this paper, we discuss the use of unfiltered STIS imaging data for a project that requires deep observations along as many independent lines-of-sight as possible. We have developed a technique to determine which datasets in the archive can safely be co-added together and have developed an iterative co-addition technique which enabled us to produce 498 high-quality, deep images. The principal motivation for this work is to measure the Cosmic Shear on small angular scales and a value derived from these data will be presented in a subsequent paper. A valuable by-product of this work is a set of high quality combined fields which can be used for other projects. The data are publicly available at http://www.stecf.org/projects/shear/

Pirzkal, N; Erben, T; Fosbury, R A E; Freudling, W; Haemmerle, H; Jain, B K; Micol, A; Miralles, J M; Schneider, P; Seitz, S; White, S D M

2001-01-01T23:59:59.000Z

332

Feedback control of flow alignment in sheared liquid crystals  

E-Print Network (OSTI)

Based on a continuum theory, we investigate the manipulation of the non-equilibrium behavior of a sheared liquid crystal via closed-loop feedback control. Our goal is to stabilize a specific dynamical state, that is, the stationary "flow-alignment", under conditions where the uncontrolled system displays oscillatory director dynamics with in-plane symmetry. To this end we employ time-delayed feedback control (TDFC), where the equation of motion for the ith component, q_i(t), of the order parameter tensor is supplemented by a control term involving the difference q_i(t)-q_i(t-\\tau). In this diagonal scheme, \\tau is the delay time. We demonstrate that the TDFC method successfully stabilizes flow alignment for suitable values of the control strength, K, and \\tau; these values are determined by solving an exact eigenvalue equation. Moreover, our results show that only small values of K are needed when the system is sheared from an isotropic equilibrium state, contrary to the case where the equilibrium state is nematic.

David A. Strehober; Eckehard Schöll; Sabine H. L. Klapp

2013-08-29T23:59:59.000Z

333

Cosmic shear from STIS Pure Parallels: I Data  

E-Print Network (OSTI)

Following the second HST servicing mission in 1997 when the STIS instrument was installed and the capability for parallel observations was enhanced, a substantial archive of non-proprietary parallel data has been accumulating. In this paper, we discuss the use of unfiltered STIS imaging data for a project that requires deep observations along as many independent lines-of-sight as possible. We have developed a technique to determine which datasets in the archive can safely be co-added together and have developed an iterative co-addition technique which enabled us to produce 498 high-quality, deep images. The principal motivation for this work is to measure the Cosmic Shear on small angular scales and a value derived from these data will be presented in a subsequent paper. A valuable by-product of this work is a set of high quality combined fields which can be used for other projects. The data are publicly available at http://www.stecf.org/projects/shear/

N. Pirzkal; L. Collodel; T. Erben; R. A. E. Fosbury; W. Freudling; H. Haemmerle; B. Jain; A. Micol; J. -M. Miralles; P. Schneider; S. Seitz; S. D. M. White

2001-02-20T23:59:59.000Z

334

What are Ccf, Mcf, Btu, and therms? How do I convert prices in ...  

U.S. Energy Information Administration (EIA)

Natural Gas Conversion Calculator. Last updated: March 20, 2013. Other FAQs about Conversion & Equivalents. How do I convert between short tons and metric tons?

335

How do I convert between short tons and metric tons? - FAQ - U ...  

U.S. Energy Information Administration (EIA)

Other FAQs about Conversion & Equivalents. How do I convert between short tons and metric tons? How do I compare heating fuels?

336

Bibliography on overvoltage protection and insulation coordination of HVDC converter stations, 1979-1989  

Science Conference Proceedings (OSTI)

This bibliography is a listing of references on the subject of overvoltage protection and insulation coordination of HVDC converter stations, for the years 1979 through 1989.

Not Available

1991-04-01T23:59:59.000Z

337

Gasification is used to convert a solid feedstock, such as coal...  

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

can be captured and disposed of or converted to useful products more easily with gasification-based technologies compared to conventional combustion of solid feedstocks....

338

Index of /~jborwein/Expbook/Manuscript/Graphics files/please_convert  

E-Print Network (OSTI)

Index of /~jborwein/Expbook/Manuscript/Graphics files/please_convert. Icon Name Last modified Size Description. [DIR] Parent Directory - [DIR] ...

339

New Family of Multilevel Matrix Converters for Wind Power Applications: Final Report, July 2002 - March 2006  

DOE Green Energy (OSTI)

The goal of this project was to develop a new modular multilevel matrix converter for wind power applications and to demonstrate a working scale model in the laboratory.

Erickson, R.; Angkititrakul, S.; Almazeedi, K.

2006-12-01T23:59:59.000Z

340

Wind Shear Characteristics at Central Plains Tall Towers  

Science Conference Proceedings (OSTI)

The object of this study is to analyze wind shear characteristics at tall tower sites in the Central Plains of the United States. The hub heights of modern turbines used for wind farm projects are now 70 meters (m) to 100 m above ground and some advanced turbines under development for deployment during the second half of this decade are rated at 2-5 megawatts of energy generation with rotor diameters near 100 m and hub heights of 100-120 m. These advanced turbines will take advantage of the higher wind speeds aloft to generate more wind energy. Specific knowledge of important wind shear characteristics near and at turbine hub height is needed to optimize turbine design and wind farm layout. Unfortunately, wind speed shear measurements at heights of 80-120 m were virtually nonexistent a few years ago and are still quite uncommon today. The Central Plains is a prime wind energy development region and knowledge about the wind shear characteristics will reduce uncertainty about the resource and enhance wind farm design. Previous analyses of tall tower data (Schwartz and Elliott, 2005) concentrated on data from specific states. The wind energy community has recognized the need to fill the gap of direct wind speed measurements at levels 70 m and higher above the ground. Programs instituted during the last 5 years at the state level and supported by the U.S. Department of Energy's (DOE) State Energy Program initiative have placed anemometers and vanes at several levels on existing tall (70 m+) communication towers. The Central Plains has a fairly high concentration of tall tower sites. The distribution of tall tower sites varies among the states in the Central Plains, because the tall tower program is new and the available state and federal funding to establish tall towers is variable. Our wind resource assessment group at DOE's National Renewable Energy Laboratory (NREL) has obtained much of these necessary measurement data from both individual state sources and regional organizations. Most of the data are available to the public, though data from one tower in Colorado are proprietary. We have begun to analyze important wind climate parameters, including wind shear from the tall towers. A total of 13 tall towers were used for this study. Eleven of the towers had the highest anemometer level between 100 m and 113 m. Two towers had the highest measurement level between 70 m and 85 m above ground. The distribution of the towers among the states is: two sites in Texas and Oklahoma; six sites in Kansas; and one site each in Colorado, South Dakota, and North Dakota. Figure 1 shows the locations and names of the thirteen towers. The wind resource at these sites can be classified as ranging from good-to-excellent. Eight tall tower sites have Class 3 resource, four sites have Class 4 resource, and one has Class 5 resource at 50 m.

Schwartz, M.; Elliott, D.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Shear and Bending Fatigue Failure of Lead Free Solder Joint and ...  

Science Conference Proceedings (OSTI)

Among many mechanisms leading to solder joint failure, the fracture by cyclic bending, shear, and shock load is particularly concerned. Conventionally, those ...

342

An early history of pure shear in the upper plate of the raft...  

Open Energy Info (EERE)

early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho Jump to: navigation, search GEOTHERMAL...

343

Wind Shear and Resources at Elevated Heights: Indiana and Iowa Case Studies (Poster)  

DOE Green Energy (OSTI)

This poster discusses the results of an analysis of wind shear and resource characteristics data collected by tall towers in Indiana and Iowa.

Elliott, D.; Schwartz, M.; Scott, G.

2008-06-01T23:59:59.000Z

344

Particle-in-Cell Simulations of Relativistic Shear Flow Boundary Layer  

E-Print Network (OSTI)

Using 2.5-dimensional Particle-in-Cell simulations, we studied the kinetic physics of relativistic shear flows. We find efficient magnetic field generation and nonthermal particle acceleration at the shear boundary. Ordered flux tubes/sheets with alternating polarities and peak fields reaching equipartition values are generated and sustained by the free-energy of the shear flow. Nonthermal high-energy particles are accelerated by diffusive acceleration. A quasi-power-law tail truncated at low energies is achieved at strong shears. These results have important implications for the dissipation and radiation of relativistic jets.

Liang, Edison; Boettcher, Markus

2011-01-01T23:59:59.000Z

345

An Analysis of Bridge Abutment Shear Key Behavior due to Embankment Modeling and Earthquake Intensity  

E-Print Network (OSTI)

Maximum and Minimum Displacement Demands .Shear Key Maximum and Minimum Displacement Demands B Max Minunder 5, the maximum displacement ductility demand specified

Wasef, Nardin Mofid

346

Shear thickening in concentrated suspensions: phenomenology, mechanisms, and relations to jamming  

E-Print Network (OSTI)

Shear thickening is a type of non-Newtonian behavior in which the stress required to shear a fluid increases faster than linearly with shear rate. Many concentrated suspensions of particles exhibit an especially dramatic version, known as Discontinuous Shear Thickening (DST), in which the stress suddenly jumps with increasing shear rate and produces solid-like behavior. The best known example of such counter-intuitive response to applied stresses occurs in mixtures of cornstarch in water. Over the last several years, this shear-induced solid-like behavior together with a variety of other unusual fluid phenomena has generated considerable interest in the physics of densely packed suspensions. In this review, we discuss the common physical properties of systems exhibiting shear thickening, and different mechanisms and models proposed to describe it. We then suggest how these mechanisms may be related and generalized, and propose a general phase diagram for shear thickening systems. We also discuss how recent work has related the physics of shear thickening to that of granular materials and jammed systems. Since DST is described by models that require only simple generic interactions between particles, we outline the broader context of other concentrated many-particle systems such as foams and emulsions, and explain why DST is restricted to the parameter regime of hard-particle suspensions. Finally, we discuss some of the outstanding problems and emerging opportunities.

Eric Brown; Heinrich M. Jaeger

2013-07-01T23:59:59.000Z

347

Wind Shear and Turbulence Profiles at Elevated Heights: Great Lakes and Midwest Sites (Poster)  

DOE Green Energy (OSTI)

Analyzed wind resource characteristics at elevated heights (50 m-200+m) incuding shear and turbulence profiles for some areas of the Great Lakes and M idwest sites.

Elliott, D.; Schwartz, M.; Scott, G.

2009-05-01T23:59:59.000Z

348

Thermal analysis and testing of a vacuum insulated catalytic converter  

DOE Green Energy (OSTI)

Based on a recent US Environmental Protection Agency (EPA) study, about 95% of all trips start after a cold-soak period of 16 hours or less. By preserving the heat in the catalyst between trips, exhaust gases could be processed without warm-up delay and without the usual cold-start emissions. Vacuum insulation and phase-change thermal storage have been incorporated into a catalytic converter design to enhance its heat-retention time. Laboratory testing of a bench-scale prototype showed that a ``light off`` temperature (above 350 C) could be maintained during a 10-hour cold soak. Design improvements currently being tested should increase this heat-retention time to more than 16 hours. The thermal conductance of the vacuum insulation will be made continuously variable to prevent overheating and excessive thermal cycling. This approach to thermal management may be more durable and less costly than quick-heat methods using electric or fuel-fired preheat catalysts.

Burch, S D; Potter, T F; Keyser, M A; Benson, D K

1994-11-01T23:59:59.000Z

349

Converting acoustic energy into useful other energy forms  

SciTech Connect

Sonoluminescence is an off-equilibrium phenomenon in which the energy of a resonant sound wave in a liquid is highly concentrated so as to generate flashes of light. The conversion of sound to light represents an energy amplification of eleven orders of magnitude. The flashes which occur once per cycle of the audible or ultrasonic sound fields can be comprised of over one million photons and last for less 100 picoseconds. The emission displays a clocklike synchronicity; the jitter in time between consecutive flashes is less than fifty picoseconds. The emission is blue to the eye and has a broadband spectrum increasing from 700 nanometers to 200 nanometers. The peak power is about 100 milliWatts. The initial stage of the energy focusing is effected by the nonlinear oscillations of a gas bubble trapped in the liquid. For sufficiently high drive pressures an imploding shock wave is launched into the gas by the collapsing bubble. The reflection of the shock from its focal point results in high temperatures and pressures. The sonoluminescence light emission can be sustained by sensing a characteristic of the emission and feeding back changes into the driving mechanism. The liquid is in a sealed container and the seeding of the gas bubble is effected by locally heating the liquid after sealing the container. Different energy forms than light can be obtained from the converted acoustic energy. When the gas contains deuterium and tritium there is the feasibility of the other energy form being fusion, namely including the generation of neutrons.

Putterman, Seth J. (Sherman Oaks, CA); Barber, Bradley Paul (Northridge, CA); Hiller, Robert Anthony (Los Angeles, CA); Lofstedt, Ritva Maire Johanna (Los Angeles, CA)

1997-01-01T23:59:59.000Z

350

Measured and projected performance of plasma direct converters  

DOE Green Energy (OSTI)

Test results from two plasma direct converters and their predicted cost and performance on tandem mirror fusion reactors are present. The tests were done at high power density (approx. 70 W/cm/sup 2/) in steady state to simulate the predicted conditions in a reactor. A single stage unit and a two-stage unit of the Venetian blind type were tested at up to 100 kV and 6 kW for a total time of about 80 hours. Measured efficiencies, when projected to a reactor, are typically about 50% for a single stage unit and 60 to 70% for a two-stage unit, depending on the energy distribution of the ions, the degree of subdivision of the collectors, and on the gas pressure. The high ambipolar potential in tandem mirror devices makes this good efficiency possible. When radiatively cooled grids are used, the incident power density is limited to about 100 W/cm/sup 2/ by the thermionic emission of electrons.

Barr, W.L.; Moir, R.W.

1981-10-22T23:59:59.000Z

351

Analysis of electron transport in the plasma of thermionic converters  

DOE Green Energy (OSTI)

Electron transport coefficients of a gaseous ensemble are expressed analytically as function of density, and are expressed analytically as function of temperature up to an unknown function which has to be evaluated for each specific electron-neutral atom cross section. In order to complete the analytical temperature dependence one may introduce a polynomial expansion of the function or one may derive the temperature dependence of a set of coefficients, numbering thirteen for a third approximation transport evaluation, which completely determine the transport coefficients. The latter approach is used for determining the electron transport coefficients of a cesium plasma for any ion neutral composition and any temperature between 500/sup 0/K and 3500/sup 0/K. The relation between the transport coefficients of a fully and partly ionized gas is readily available and shows that, in the classical formalism, electron-ion and electron-neutral resistivities are not additive. The present form of the transport coefficients makes possible an accurate numerical integration of transport equations eliminating lengthy computations which are frequently inaccessible. It thus provides a detailed knowledge of spatial distribution of particle and energy transport and makes possible the determination of one of the three internal voltage drops, surface barrier, sheath and plasma, which are linked together experimentally by current density versus voltage characteristics of thermionic converters.

Stoenescu, M.L.; Heinicke, P.H.

1980-03-01T23:59:59.000Z

352

A local fitting algorithm for converting planar curves to  

E-Print Network (OSTI)

In this paper we present a local fitting algorithm for converting smooth planar curves to B-splines. For a smooth planar curve a set of points together with their tangent vectors are first sampled from the curve such that the connected polygon approximates the curve with high accuracy and inflexions are detected by the sampled data efficiently. Then, a G 1 continuous Bézier spline curve is obtained by fitting the sampled data with shape preservation as well as within a prescribed accuracy. Finally, the Bézier spline is merged into a C 2 continuous B-spline curve by subdivision and control points adjustment. The merging is guaranteed to be within another error bound and with no more inflexions than the Bézier spline. In addition to shape preserving and error control, this conversion algorithm also benefits that the knots are selected automatically and adaptively according to local shape and error bound. A few experimental results are included to demonstrate the validity and efficiency of the algorithm. Keywords: curve conversion; B-spline curve; cubic Bézier curve; knot selection; shape preserving 1.

unknown authors

2007-01-01T23:59:59.000Z

353

Advanced Gate Drive for the SNS High Voltage Converter Modulator  

SciTech Connect

SLAC National Accelerator Laboratory is developing a next generation H-bridge switch plate [1], a critical component of the SNS High Voltage Converter Modulator [2]. As part of that effort, a new IGBT gate driver has been developed. The drivers are an integral part of the switch plate, which are essential to ensuring fault-tolerant, high-performance operation of the modulator. The redesigned driver improves upon the existing gate drive in several ways. The new gate driver has improved fault detection and suppression capabilities; suppression of shoot-through and over-voltage conditions, monitoring of dI/dt and Vce(sat) for fast over-current detection and suppression, and redundant power isolation are some of the added features. In addition, triggering insertion delay is reduced by a factor of four compared to the existing driver. This paper details the design and performance of the new IGBT gate driver. A simplified schematic and description of the construction are included. The operation of the fast over-current detection circuits, active IGBT over-voltage protection circuit, shoot-through prevention circuitry, and control power isolation breakdown detection circuit are discussed.

Nguyen, M.N.; Burkhart, C.; Kemp, M.A.; /SLAC; Anderson, D.E.; /Oak Ridge

2009-05-07T23:59:59.000Z

354

Device to convert the energy of a fluid in motion  

SciTech Connect

A device is disclosed to convert wave energy into mechanical energy, comprises a buoyant structure whose upper portion is in the region of wave action but whose lower section is below the region of wave action, so that the water adjacent the upper and lower sections of the structure has vertical movement relative to itself. This relative movement is used to rotate a vertical shaft having radially extending horizontal axles on which panels are pivotally mounted. Ballast and/or floats are used to impose on the panels a bias tending to maintain them horizontal. The relative movement of the water is used to impel fluid vertically relative to the panels in alternatingly opposite directions; and the bias imposed by the ballast and/or floats thus causes a planing wing action of the panels which impels the shaft in rotation in one direction regardless of the direction of the movement of the impelling fluid. The floating structure can rise and fall with the waves, in which case the blade are disposed at the lower end of the device, in the still water; or the device can be stationary in the water, in which case the blades are subject to a fluid such as the water itself or air impelled by the water, at the upper end of the device.

de la Roche Kerandraon, O.; Guillaume, P.; Paroldi, D.

1983-09-27T23:59:59.000Z

355

Evaluation of Simplified Methods for Estimating Shear Capacity Using JNES/NUPEC Low-Rise Concrete Shear Wall Cyclic Test Data.  

SciTech Connect

The simplified methods in current codes for determining the shear capacity of reinforced concrete shear walls had mostly been validated using the test results of single-element shear walls. Recently available JNES/NUPEC test data of reinforced concrete shear walls under multi-directional cyclic loadings provided a unique opportunity to investigate the adequacy of the simplified methods for use in situations with strong interaction effects. A total of 11 test specimens with aspect ratios between 0.47 and 0.87 have been used in the assessment. Two simplified methods from the ACI 349-01 standard [1] and one from the ASCE 43-05 standard [2] have been evaluated. This paper also presents the development of an adjustment factor to consider the aspect ratio and the development of two approaches to consider interaction effects for one of the simplified methods. It concludes with the insights on the applicability of the code methods when interaction effects exist.

Nie,J.; Braverman, J.; Hofmayer, C.; Ali, S.

2008-06-01T23:59:59.000Z

356

Turbulent Shear Flows 9: Selected Papers from the Ninth International Symposium on Turbulent Shear Flows, Kyoto, Japan, August 16-18, 1993, 1st edition  

Science Conference Proceedings (OSTI)

This volume from the well-known series on turbulent shear flows contains four parts on closures and fundamentals, free flows, wall flows and combustion and recirculating flows. Each section begins with an invited introductory article followed by a selection ...

Franz Durst; Nobuhide Kasagi; Brian E. Launder; Frank W. Schmidt; Kenjiro Suzuki; James H. Whitelaw

2012-07-01T23:59:59.000Z

357

Adaptive stabilizing control of a power system through UPFC shunt and series converters  

Science Conference Proceedings (OSTI)

The dynamic performance of a power system can be improved by using additional controls in a unified power flow controller (UPFC). Self-tuning adaptive control of the voltage magnitude of the series converter and phase angle of shunt converter for stabilization ... Keywords: UPFC, adaptive control, on-line identification, pole - shifting control, power system stabilizing control

A. H. M. A. Rahim; E. P. Nowicki

2007-07-01T23:59:59.000Z

358

A 1-GSPS CMOS Flash A/D Converter for System-on-Chip Applications  

Science Conference Proceedings (OSTI)

Abstract: This paper presents an ultrafast CMOS flash A/D converter design and performance. Although the featured A/D converter is designed in CMOS, the performance is compatible to that of GaAs technology currently available. To achieve high-speed in ...

Jincheol Yoo; Kyusun Choi; Ali Tangel

2001-04-01T23:59:59.000Z

359

Improvements in power quality and efficiency with a new AC/DC high current converter  

Science Conference Proceedings (OSTI)

A very flexible AC/DC converter featuring high-output current, reduced voltage ripple and highly adjustable current control is described. The whole system consists of four stages and uses a proper switching technique in conjunction with a feedback control ... Keywords: AC/DC converter, FFT, electrical distribution systems, high direct-current, power quality

Francesco Muzi; Luigi Passacantando

2008-05-01T23:59:59.000Z

360

Sliding Mode Control of Boost Converter: Application to energy storage system via supercapacitors  

E-Print Network (OSTI)

Sliding Mode Control of Boost Converter: Application to energy storage system via supercapacitors», «Robust control», «Supercapacitor». Abstract Sliding mode control of boost converter is studied. In order of an energy storage system based on supercapacitors technology in order to regulate the output voltage. Given

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Simulation Research of Tap Change Control of Converter Transformers for HVDC Transmission System  

Science Conference Proceedings (OSTI)

High voltage direct current(HVDC) control system plays an important role for the safety of HVDC transmission system. Converter transformer tap changes control is core component of HVDC control system. Stability of HVDC transmission system operation is ... Keywords: HVDC, simulation, converter transformer, tap change control, steady process

Wang Ying; Ma Cong; Wei Wen-hui; Wang Qing-ping

2012-03-01T23:59:59.000Z

362

EPRI Power Flow to CIM Interface: Development of Power Flow to Common Information Model (CIM) Converter  

Science Conference Proceedings (OSTI)

IEEE has developed a Power Systems Application Data Dictionary (PSADD) for power system data and EPRI sponsored development of a CONVERTER program to convert PTI's PSS/E's data into this format. This project will develop the common data sources (CDSs) that translate the PSADD data to/from a Common Information Model (CIM)-structured database.

2002-11-27T23:59:59.000Z

363

Relation between verifiable random functions and convertible undeniable signatures, and new constructions  

Science Conference Proceedings (OSTI)

Verifiable random functions (VRF) and selectively convertible undeniable signature (SCUS) schemes were proposed independently in the literature. In this paper, we observe that they are tightly related. This directly yields several deterministic SCUS ... Keywords: selectively convertible undeniable signatures, standard model, verifiable random function

Kaoru Kurosawa; Ryo Nojima; Le Trieu Phong

2012-07-01T23:59:59.000Z

364

Structural And Economic Optimisation Of Bottom-Mounted Offshore Wind Energy Converters  

E-Print Network (OSTI)

A general overview is presented of the Opti-OWECS project. In several fields, support structure design, installation of the offshore wind energy converters, operation and maintenance, dynamics of the entire offshore wind energy converter, structural reliability considerations, etc., the study demonstrated new propositions which will contribute significantly to a mature offshore wind energy technology.

M. Kühn; W. A. A. M. Bierbooms; G.J.W. van Bussel; M. C. Ferguson; B. Göransson; T.T. Cockerill; R. Harrison; L.A. Harland; J. H. Vugts; R. Wiecherink; Kvaerner Turbin Ab

1999-01-01T23:59:59.000Z

365

Do Investment Banks' Relationships with Investors Impact Pricing? The Case of Convertible Bond Issues  

Science Conference Proceedings (OSTI)

This study examines the role of repeat interactions between placement agents (investment banks) and investors in the initial pricing of convertible bonds. Under the assumption that attracting repeat investors can reduce search frictions in primary issue ... Keywords: convertible bonds, corporate finance, securities issuance, underpricing

Brian J. Henderson; Heather Tookes

2012-12-01T23:59:59.000Z

366

Experimental studies and computer simulation of the control of energy transfer using inductor-converter bridges  

DOE Green Energy (OSTI)

An inductor-converter bridge (ICB) is a solid state DC-AC-DC power converter system for bidirectional, controllable, energy transfer between two coils. The ICB is suitable for supplying large pulsed power to such magnets as the superconducting equilibrium field coil of the proposed tokamak power reactors from another superconducting energy storage coil.

Hirano, M.; Kustom, R.L.

1984-03-01T23:59:59.000Z

367

Solar Power To Help Convert Carbon Dioxide Into Fuel : Renewable Energy News  

E-Print Network (OSTI)

Solar Power To Help Convert Carbon Dioxide Into Fuel : Renewable Energy News TUESDAY 25 MAY, 2010 | | Solar Power To Help Convert Carbon Dioxide Into Fuel by Energy Matters Microbiologist Derek Lovley dioxide into transportation fuels, with the help of special micro-organisms and solar power. The team

Lovley, Derek

368

Brief paper: Optimal switching instants for a switched-capacitor DC/DC power converter  

Science Conference Proceedings (OSTI)

We consider a switched-capacitor DC/DC power converter with variable switching instants. The determination of optimal switching instants giving low output ripple and strong load regulation is posed as a non-smooth dynamic optimization problem. By introducing ... Keywords: Control parametrization enhancing transform, Impulsive dynamical system, Power converter, Semi-infinite programming, Switched linear system

R. C. Loxton; K. L. Teo; V. Rehbock; W. K. Ling

2009-04-01T23:59:59.000Z

369

Association of Flyback Converters to Harvest Energy from Multiple Hydraulically Connected Biofuel Cells  

Science Conference Proceedings (OSTI)

Biofuel cells use catalysts (chemical, enzymatic or microbial) to convert chemical energy from organic substrates into electrical energy. This paper investigates energy harvesting from several low-power biofuel cells to power a load under several volts. ... Keywords: biofuel cell, energy harvesting, power management, flyback converter, low-power supply

Nicolas Degrenne, Marilyne Boileau, Florent Morel, Firas Khaled, Olivier Ondel, Francois Buret, Bruno Allard

2012-11-01T23:59:59.000Z

370

Developing and Simulation Research of the Control Model and Control Strategy of Static Frequency Converter  

Science Conference Proceedings (OSTI)

a control model and control strategy of static frequency converter (SFC) for pumped storage power plant unit is presented. Control strategy of static start-up and its mathematical model is discussed in detail. And based on the 42 poles of synchronous ... Keywords: Pumped Storage Power Plant, Static Frequency Converter, SFC, Commutation, Control

Deshun Wang; Lichun Zhang; Bo Yang; Guanjun Li; Yibin Tao; Jianzhong Fu; Jianfeng Li; Liantao Ji

2012-01-01T23:59:59.000Z

371

Observations of the mid-mantle discontinuity beneath Indonesia from S to P converted waveforms  

E-Print Network (OSTI)

Observations of the mid-mantle discontinuity beneath Indonesia from S to P converted waveforms a coherent discontinuity structure beneath Indonesia. Analysis of data recorded by three regional arrays from Indonesia from S to P converted waveforms, Geophys. Res. Lett., 33, L04302, doi:10.1029/2005GL025106. 1

Kawakatsu, Hitoshi

372

Multiport DC/DC Converter for Stand-alone Photovoltaic Lighting System with Battery Storage  

Science Conference Proceedings (OSTI)

Photovoltaic energy has nowadays an increased importance in electrical power applications. However, the output power provided via the photovoltaic conversion process depends on solar irradiation and temperature. Therefore a multiple-input DC/DC converter ... Keywords: Multiport DC/DC Converter, photovoltaic (PV), battery, charge/discharge

Shengyong Liu; Xing Zhang; Haibin Guo; Jun Xie

2010-06-01T23:59:59.000Z

373

Control of Parallel-Connected Bidirectional AC-DC Converters in Stationary Frame for Microgrid  

E-Print Network (OSTI)

Control of Parallel-Connected Bidirectional AC-DC Converters in Stationary Frame for Microgrid-- With the penetration of renewable energy in modern power system, microgrid has become a popular application worldwide. In this paper, parallel-connected bidirectional converters for AC and DC hybrid microgrid application

Teodorescu, Remus

374

CMOS flash analog-to-digital converter for high speed and low voltage applications  

Science Conference Proceedings (OSTI)

A CMOS flash analog-to-digital converter (ADC) designed for high speed and low voltage is presented. Using the Threshold Inverter Quantization (TIQ) comparator technique, a flash ADC can be applied to low supply voltage. A fat tree encoder that has signal ... Keywords: TIQ comparator, analog-to-digital converter, fat tree encoder, flash ADC, high speed, low voltage

Jincheol Yoo; Kyusun Choi; Jahan Ghaznavi

2003-04-01T23:59:59.000Z

375

Hydrodynamic granular segregation induced by boundary heating and shear  

E-Print Network (OSTI)

Segregation induced by a thermal gradient of an impurity in a driven low-density granular gas is studied. The system is enclosed between two parallel walls from which we input thermal energy to the gas. We study here steady states occurring when the inelastic cooling is exactly balanced by some external energy input (stochastic force or viscous heating), resulting in a uniform heat flux. A segregation criterion based on Navier-Stokes granular hydrodynamics is written in terms of the tracer diffusion transport coefficients, whose dependence on the parameters of the system (masses, sizes and coefficients of restitution) is explicitly determined from a solution of the inelastic Boltzmann equation. The theoretical predictions are validated by means of Monte Carlo and molecular dynamics simulations, showing that Navier-Stokes hydrodynamics produces accurate segregation criteria even under strong shearing and/or inelasticity.

Francisco Vega Reyes; Vicente Garzó; Nagi Khalil

2013-10-02T23:59:59.000Z

376

Modelling Shear Flows with SPH and Grid Based Methods  

E-Print Network (OSTI)

Given the importance of shear flows for astrophysical gas dynamics, we study the evolution of the Kelvin-Helmholtz instability (KHI) analytically and numerically. We derive the dispersion relation for the two-dimensional KHI including viscous dissipation. The resulting expression for the growth rate is then used to estimate the intrinsic viscosity of four numerical schemes depending on code-specific as well as on physical parameters. Our set of numerical schemes includes the Tree-SPH code VINE, an alternative SPH formulation developed by Price (2008), and the finite-volume grid codes FLASH and PLUTO. In the first part, we explicitly demonstrate the effect of dissipation-inhibiting mechanisms such as the Balsara viscosity on the evolution of the KHI. With VINE, increasing density contrasts lead to a continuously increasing suppression of the KHI (with complete suppression from a contrast of 6:1 or higher). The alternative SPH formulation including an artificial thermal conductivity reproduces the analytically ...

Junk, Veronika; Heitsch, Fabian; Burkert, Andreas; Wetzstein, Markus; Schartmann, Marc; Price, Daniel

2010-01-01T23:59:59.000Z

377

Mixing and segregation rates in sheared granular materials  

E-Print Network (OSTI)

The size-segregation of granular materials, a process colloquially known as the Brazil Nut Effect, has generally been thought to proceed faster the greater the size difference of the particles. We experimentally investigate sheared bidisperse granular materials as a function of the size ratio of the two species, and find that the mixing rate at low confining pressure behaves as expected from percolation-based arguments. However, we also observe an anomalous effect for the re-segregation rates, wherein particles of both dissimilar and similar sizes segregate more slowly than intermediate particle size ratios. Combined with the fact that increasing the confining pressure significantly suppresses both mixing and segregation rates of particles of dissimilar size, we propose that the anomalous behavior may be attributed to a species-dependent distribution of forces within the system.

Laura A. Golick; Karen E. Daniels

2009-06-17T23:59:59.000Z

378

Emissions and Experiences with E85 Converted Cars in the BEST Project |  

Open Energy Info (EERE)

Emissions and Experiences with E85 Converted Cars in the BEST Project Emissions and Experiences with E85 Converted Cars in the BEST Project Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Emissions and Experiences with E85 Converted Cars in the BEST Project Agency/Company /Organization: BioEthanol for Sustainable Transport Focus Area: Fuels & Efficiency Topics: Best Practices Website: www.best-europe.org/upload/BEST_documents/info_documents/Best%20report The BioEthanol for Sustainable Transport (BEST) project converted vehicles from petrol to E85, exploring the possibilities, advantages, and any difficulties. Several suggestions are presented for how converted cars may be incorporated into Swedish government financial incentives. How to Use This Tool This tool is most helpful when using these strategies: Shift - Change to low-carbon modes

379

Utility-Scale Power Router: Dynamic Control of Grid Assets Using Direct AC Converter Cells  

SciTech Connect

ADEPT Project: Georgia Tech is developing a cost-effective, utility-scale power router that uses an enhanced transformer to more efficiently direct power on the grid. Existing power routing technologies are too expensive for widespread use, but the ability to route grid power to match real-time demand and power outages would significantly reduce energy costs for utilities, municipalities, and consumers. Georgia Tech is adding a power converter to an existing grid transformer to better control power flows at about 1/10th the cost of existing power routing solutions. Transformers convert the high-voltage electricity that is transmitted through the grid into the low-voltage electricity that is used by homes and businesses. The added converter uses fewer steps to convert some types of power and eliminates unnecessary power storage, among other improvements. The enhanced transformer is more efficient, and it would still work even if the converter fails, ensuring grid reliability.

None

2010-09-01T23:59:59.000Z

380

Compact self-contained electrical-to-optical converter/transmitter  

DOE Patents (OSTI)

An electrical-to-optical converter/transmitter is disclosed. A first optical receiver and a second optical receiver are provided for receiving a calibrate command and a power switching signal, respectively, from a remote processor. A third receiver is provided for receiving an analog electrical signal from a transducer. A calibrator generates a reference signal in response to the calibrate command. A combiner mixes the electrical signal with the reference signal to form a calibrated signal. A converter converts the calibrated signal to an optical signal. A transmitter transmits the optical signal to the remote processor. A primary battery supplies power to the calibrator, the combiner, the converter, and the transmitter. An optically-activated switch supplies power to the calibrator, the combiner, the converter, and the transmitter in response to the power switching signal. An auxiliary battery supplies power continuously to the switch means.

Seligmann, D.A.; Moss, W.C.; Valk, T.C.; Conder, A.D.

1992-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Photo of the Week: Converting Solar Energy into Fuel | Department of Energy  

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

Converting Solar Energy into Fuel Converting Solar Energy into Fuel Photo of the Week: Converting Solar Energy into Fuel May 9, 2013 - 1:13pm Addthis In this photo, Brookhaven scientist Dmitry Polyansky examines a vial containing a specialized catalyst designed to help convert solar energy into fuel. Producing clean-burning hydrogen fuel from just sunlight and water requires custom-built catalysts for water oxidation -- the part of the water-splitting process that generates oxygen atoms. A tiny amount of the solid catalyst, developed in collaboration with the University of Houston, dissolves and turns the water that lovely shade of blue. | Photo courtesy of Brookhaven National Laboratory. In this photo, Brookhaven scientist Dmitry Polyansky examines a vial containing a specialized catalyst designed to help convert solar energy

382

A new wall-shear stress model for atmospheric boundary layer simulations  

Science Conference Proceedings (OSTI)

A new wall-shear stress model to be used as wall-boundary condition for Large Eddy Simulations of the Atmospheric Boundary Layer is proposed. The new model computes the wall shear stress and the vertical derivatives of the streamwise velocity ...

Marcus Hultmark; Marc Calaf; Marc B. Parlange

383

Experimental and analytical study of the shear instability of a gas-liquid mixing layer  

E-Print Network (OSTI)

Experimental and analytical study of the shear instability of a gas- liquid mixing layer Jean://pof.aip.org/about/rights_and_permissions #12;Experimental and analytical study of the shear instability of a gas-liquid mixing layer Jean analysis of a planar mixing layer, where a fast gas stream destabilizes a slower parallel liquid stream

Paris-Sud XI, Université de

384

Calibration of a FE model of masonry shear panels strengthened by metal sheathing  

Science Conference Proceedings (OSTI)

In order to calibrate advanced FE Model experimental tests on masonry wall panel specimens in shear as well as on some panels strengthened by ductile steel are used. Application of finite element material models to simulate the behavior of masonry is ... Keywords: FE model, innovative retrofitting techniques, masonry shear panels, material models

A. Dogariu; F. Campitiello

2010-04-01T23:59:59.000Z

385

Resolving Oceanic Shear and Velocity with the Multi-Scale Profiler  

Science Conference Proceedings (OSTI)

The Multi-Scale Profiler (MSP), a freely falling dropsonde, has been used over the past 12 years to measure oceanic shear variance. Complete resolution of oceanic shear spectra is achieved by combining the measurements of MSP’s acoustic current ...

D. P. Winkel; M. C. Gregg; T. B. Sanford

1996-10-01T23:59:59.000Z

386

Nonequilibrium molecular dynamics simulation of shear viscosity by a uniform momentum source-and-sink scheme  

Science Conference Proceedings (OSTI)

A uniform momentum source-and-sink scheme of nonequilibrium molecular dynamics (NEMD) is developed to calculate the shear viscosity of fluids in this paper. The uniform momentum source and sink are realized by momentum exchanges of individual atoms in ... Keywords: Molecular fluid, Nonequilibrium molecular dynamics, Shear viscosity, Uniform source-and-sink scheme

Bing-Yang Cao; Ruo-Yu Dong

2012-06-01T23:59:59.000Z

387

The Auto-Correlation Function of the extragalactic background light: I. Measuring gravitational shear  

E-Print Network (OSTI)

A new method for measuring the shear induced by gravitational light deflection is proposed. It is based on analyzing the anisotropy induced in the auto-correlation function (ACF) of the extragalactic background light which is produced by very faint distant galaxies. The ACF can be measured `locally', and its anisotropy is caused by the tidal gravitational field of the deflecting mass distribution in the foreground of these faint background galaxies. Since the method does not require individual galaxy detection, it can be used to measure the shear of extremely faint galaxies which are not detectable individually, but are present in the noise. The shear estimated from the ACF of the noise provides an independent measurement which can be compared to the shear obtained from the distortion of individual galaxy images. Combining these two independent estimates clearly increases the sensitivity of shear measurements. In addition, our method may allow to determine the local magnification caused by the deflector if the auto-correlation function is caused by a large number density of faint galaxies; in this case, the intrinsic ACF may provide a `standard source' with respect to which shear and magnification can be obtained. Applications to real and synthetic data are shown and the feasibility of our new method is demonstrated. In particular, we present the shear maps obtained with our method for the double QSO 2345+007 and the cluster Cl0024+16 and compare them to published shear maps.

L. Van Waerbeke; Y. Mellier; P. Schneider; B. Fort; G. Mathez

1996-04-23T23:59:59.000Z

388

An early history of pure shear in the upper plate of the raft river  

Open Energy Info (EERE)

early history of pure shear in the upper plate of the raft river early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: An early history of pure shear in the upper plate of the raft river metamorphic core complex- black pine mountains, southern Idaho Details Activities (1) Areas (1) Regions (0) Abstract: Although commonly obscured by simple shear, pure shear fabrics occur locally within many metamorphic core complexes. The cover rocks to the Raft River metamorphic core complex exposed within the Black Pine Mountains display an early coaxial strain history which developed prior to the formation of low-angle fault-bounded allochthons. At higher structural levels this is documented by pressure shadows with straight sutures, and

389

Shear-slip analysis in multiphase fluid-flow reservoir engineeringap plications using TOUGH-FLAC  

DOE Green Energy (OSTI)

This paper describes and demonstrates the use of the coupledTOUGH-FLAC simulator for geomechanical shear-slip (failure) analysis inmultiphase fluid-flow reservoir-engineering applications. Two approachesfor analyzing shear-slip are described, one using continuum stress-strainanalysis and another using discrete fault analysis. The use of shear-slipanalysis in TOUGH-FLAC is demonstrated on application examples related toCO2 sequestration and geothermal energy extraction. In the case of CO2sequestration, the shear-slip analysis is used to evaluate maximumsustainable CO2-injection pressure under increasing reservoir pressure,whereas in the case of geothermal energy extraction, the shear-slipanalysis is used to study induced seismicity during steam productionunder decreasing reservoir pressure and temperature.

Rutqvist, Jonny; Birkholzer, Jens; Cappa, Frederic; Oldenburg,Curt; Tsang, Chin-Fu

2006-01-15T23:59:59.000Z

390

The relationship between ELF-VHF waves and magnetic shear at the dayside magnetopause  

SciTech Connect

ELF-VLF waves within the current layer of the dayside magnetopause are studied using ISEE-1 data. The database consists of 272 current layer crossings at the dayside magnetopause from 1977 to 1979. For each crossing, the average intensity of ELF-VLF waves inside the current layer is obtained and the magnetic shear angle across the current layer is calculated from the magnetometer data. It is found that the wave amplitudes (both electric and magnetic fields), after normalization by the average magnetic field strength in the current layer, are proportional to the local magnetic shear angle, i.e. large magnetic shear corresponds to strong wave emission and vice versa. From the dispersion relation of the waves for different shear angles, the phase velocity of the waves increases with the magnetic shear and peaks around 700 Hz to 1 kHz. The dispersion curve of the waves is consistent with that of whistler modes. 21 refs., 3 fig.

Zhu, Z.; Song, P. [National Center for Atmospheric Research, Boulder, CO (United States)] [and others

1996-04-01T23:59:59.000Z

391

Shear and Curvature vorticity and Potential-Vorticity Interchanges: Interpretation and Application to a Cutoff Cyclone Event  

Science Conference Proceedings (OSTI)

Equations are presented for the evolution of isobaric shear and curvature vorticity and for isentropic shear and curvature potential vorticity in natural (streamline-following) coordinates, in the case of adiabatic, frictionless flow. In isobaric ...

Gerald D. Bell; Daniel Keyser

1993-01-01T23:59:59.000Z

392

Momentum Flux and Flux Divergence of Gravity Waves in Directional Shear Flows over Three-Dimensional Mountains  

Science Conference Proceedings (OSTI)

Linear mountain wave theory is used to derive the general formulas of the gravity wave momentum flux (WMF) and its vertical divergence that develop in directionally sheared flows with constant vertical shear. Height variations of the WMF and its ...

Xin Xu; Yuan Wang; Ming Xue

2012-12-01T23:59:59.000Z

393

Inertia–Gravity Wave and Neutral Eady Wave Trains Forced by Directionally Sheared Flow over Isolated Hills  

Science Conference Proceedings (OSTI)

Analytical solutions are obtained to the linearized equations describing a particular class of directionally sheared flow over isolated hills or ridges. The flows are characterized by constant buoyancy frequency and vertical wind shear, though ...

Glenn Shutts

2003-02-01T23:59:59.000Z

394

Wide input range DC-DC converter with digital control scheme  

E-Print Network (OSTI)

In this thesis analysis and design of a wide input range DC-DC converter is proposed along with a robust power control scheme. The proposed converter and its control is designed to be compatible to a fuel cell power source, which exhibits 2:1 voltage variation as well as a slow transient response. The proposed approach consists of two stages: a primary three-level boost converter stage cascaded with a high frequency, isolated boost converter topology, which provides a higher voltage gain and isolation from the input source. The function of the first boost converter stage is to maintain a constant voltage at the input of the cascaded DC-DC converter to ensure optimal performance characteristics with high efficiency. At the output of the first boost converter a battery or ultracapacitor energy storage is connected to take care of the fuel cell slow transient response (200 watts/min). The robust features of the proposed control system ensure a constant output DC voltage for a variety of load fluctuations, thus limiting the power being delivered by the fuel cell during a load transient. Moreover, the proposed configuration simplifies the power control management and can interact with the fuel cell controller. The simulation results and the experimental results confirm the feasibility of the proposed system.

Harfman Todorovic, Maja

2004-12-01T23:59:59.000Z

395

Simulation and analysis of Magnetically-Applied Pressure-Shear (MAPS) experiments.  

SciTech Connect

A new experimental technique to measure material shear strength at high pressures has been developed for use on magnetohydrodynamic (MHD) drive pulsed power platforms. The technique is referred to as Magnetically-Applied Pressure-Shear (MAPS). By applying an external static magnetic field to the sample region, the MHD drive directly induces a shear stress wave in addition to the usual longitudinal stress wave. Strength is probed by passing this shear wave through a sample material where the transmissible shear stress is limited to the sample strength. The magnitude of the transmitted shear wave is measured via a transverse velocity interferometry system (VISAR) from which the sample strength is determined. The strength of materials is defined as the ability of a material to sustain deviatoric (shear) stresses. Strength is an important aspect of the response of materials subjected to compression to high pressure. Beyond the elastic response, material strength will govern at what pressure and to what extent a material will plastically deform. The MAPS technique cleverly exploits the property that, for a von Mises yield criterion at a given longitudinal stress, the maximum amplitude shear wave that can be transmitted is limited by the strength at that stress level. Successful fielding of MAPS experiments to measure shear stresses relies upon correct numerical simulation of the experiment. Complex wave interactions among forward and reflected longitudinal and shear waves, as well as the advancing magnetic diffusion front of the MHD drive, can make the design of the experiment complicated. Careful consideration must be given to driver, sample, and anvil materials; to the thicknesses of the driver, sample and anvil layers; as well as to the timing of the interacting waves. This paper will present and analyze the 2D MHD simulations used to design the MAPS experiments. The MAPS experiments are modeled using Sandia's ALEGRA-MHD simulation code. ALEGRA-MHD is an operator-split, multi-physics, multi-material, arbitrary lagrangian-eulerian code developed to model magnetic implosion, ceramic fracture, and electromagnetic launch. We will detail the numerical investigations into MHD shear generation, longitudinal and shear stress coupling, timing of wave interactions, and transmission of shear at material interfaces.

Haill, Thomas A.; Alexander, C. Scott; Asay, James Russell

2011-06-01T23:59:59.000Z

396

A bimetal and electret-based converter for thermal energy harvesting  

E-Print Network (OSTI)

This paper presents a new device able to turn thermal gradients into electricity by using a bimetal-based heat engine coupled to an electrostatic converter. A two-steps conversion is performed: (i) a curved bimetallic strip turns the thermal gradient into a mechanical movement (thermal-to-mechanical conversion) that is (ii) then converted into electricity thanks to an electret-based electrostatic converter (mechanical-to-electrical conversion). An output power up to 5.5uW on a hot source at 50{\\deg}C has already been reached, validating this new concept.

Boisseau, S; Monfray, S; Puscasu, O; Skotnicki, T

2012-01-01T23:59:59.000Z

397

Kinetic models of current sheets with a sheared magnetic field  

Science Conference Proceedings (OSTI)

Thin current sheets, whose existence in the Earth's magnetotail is confirmed by numerous spacecraft measurements, are studied analytically and numerically. The thickness of such sheets is on the order of the ion Larmor radius, and the normal component of the magnetic field (B{sub z}) in the sheet is almost constant, while the tangential (B{sub x}) and shear (B{sub y}) components depend on the transverse coordinate z. The current density in the sheet also has two self-consistent components (j{sub x} and j{sub y}, respectively), and the magnetic field lines are deformed and do not lie in a single plane. To study such quasi-one-dimensional current configurations, two kinetic models are used, in particular, a numerical model based on the particle-in-cell method and an analytical model. The calculated results show that two different modes of the self-consistent shear magnetic field B{sub y} and, accordingly, two thin current sheet configurations can exist for the same input parameters. For the mode with an antisymmetric z profile of the B{sub y} component, the magnetic field lines within the sheet are twisted, whereas the profiles of the plasma density, current density component j{sub y}, and magnetic field component B{sub x} differ slightly from those in the case of a shearless magnetic field (B{sub y} = 0). For the symmetric B{sub y} mode, the magnetic field lines lie in a curved surface. In this case, the plasma density in the sheet varies slightly and the current sheet is two times thicker. Analysis of the dependence of the current sheet structure on the flow anisotropy shows that the sheet thickness decreases significantly with decreasing ratio between the thermal and drift plasma velocities, which is caused by the dynamics of quasi-adiabatic ions. It is shown that the results of the analytical and numerical models are in good agreement. The problems of application of these models to describe current sheets at the magnetopause and near magnetic reconnection regions are discussed.

Mingalev, O. V.; Mingalev, I. V.; Mel'nik, M. N. [Russian Academy of Sciences, Polar Geophysical Institute, Cola Science Center (Russian Federation); Artemyev, A. V.; Malova, H. V.; Popov, V. Yu. [Russian Academy of Sciences, Space Research Institute (Russian Federation); Chao, Shen [Chinese Academy of Sciences, Center for Space Science and Applied Research (China); Zelenyi, L. M. [Russian Academy of Sciences, Space Research Institute (Russian Federation)

2012-04-15T23:59:59.000Z

398

A Generalized Class of Stationary Frame-Current Controllers for Grid-Connected AC–DC Converters  

E-Print Network (OSTI)

Within power systems, high-power pulsewidth-modulated ac-dc converters are used in flexible ac transmission systems controllers and for interfacing renewable energy sources to the grid. These converters traditionally ...

Hwang, J. George

399

Shear wave velocities from noise correlation at local scale  

Science Conference Proceedings (OSTI)

Cross correlations of ambient seismic noise recordings have been studied to infer shear seismic velocities with depth. Experiments have been done in the crowded and noisy historical centre of Napoli over inter-station distances from 50 m to about 400 m, whereas active seismic spreadings are prohibitive, even for just one receiver. Group velocity dispersion curves have been extracted with FTAN method from the noise cross correlations and then the non linear inversion of them has resulted in Vs profiles with depth. The information of near by stratigraphies and the range of Vs variability for samples of Neapolitan soils and rocks confirms the validity of results obtained with our expeditious procedure. Moreover, the good comparison of noise H/V frequency of the first main peak with 1D and 2D spectral amplifications encourages to continue experiments of noise cross-correlation. If confirmed in other geological settings, the proposed approach could reveal a low cost methodology to obtain reliable and detailed Vs velocity profiles.

De Nisco, G.; Nunziata, C. [Dipartimento di Scienze della Terra, Univ. Napoli Federico II (Italy); Vaccari, F. [Dipartimento di Scienze della Terra, Univ. Trieste (Italy); Panza, G. F. [Dipartimento di Scienze della Terra, Univ. Trieste (Italy); The Abdus Salam International Center for Theoretical Physics, ESP-SAND Group, Trieste (Italy)

2008-07-08T23:59:59.000Z

400

On the effective shear speed in 2D phononic crystals  

E-Print Network (OSTI)

The quasistatic limit of the antiplane shear-wave speed ('effective speed') $c$ in 2D periodic lattices is studied. Two new closed-form estimates of $c$ are derived by employing two different analytical approaches. The first proceeds from a standard background of the plane wave expansion (PWE). The second is a new approach, which resides in $\\mathbf{x}$-space and centers on the monodromy matrix (MM) introduced in the 2D case as the multiplicative integral, taken in one coordinate, of a matrix with components being the operators with respect to the other coordinate. On the numerical side, an efficient PWE-based scheme for computing $c$ is proposed and implemented. The analytical and numerical findings are applied to several examples of 2D square lattices with two and three high-contrast components, for which the new PWE and MM estimates are compared with the numerical data and with some known approximations. It is demonstrated that the PWE estimate is most efficient in the case of densely packed stiff inclusions, especially when they form a symmetric lattice, while in general it is the MM estimate that provides the best overall fitting accuracy.

A. A. Kutsenko; A. L. Shuvalov; A. N. Norris; O. Poncelet

2011-06-27T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from  

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

Announces Six Projects to Convert Captured CO2 Announces Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products July 22, 2010 - 12:00am Addthis Washington, D.C. - U.S. Energy Secretary Steven Chu announced today the selections of six projects that aim to find ways of converting captured carbon dioxide (CO2) emissions from industrial sources into useful products such as fuel, plastics, cement, and fertilizers. Funded with $106 million from the American Recovery and Reinvestment Act -matched with $156 million in private cost-share -today's selections demonstrate the potential opportunity to use CO2 as an inexpensive raw material that can help reduce carbon dioxide emissions while producing useful by-products that Americans

402

DOE-TSPP-8-2013, Converting DOE Technical Standards to Voluntary Consensus  

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

-2013, Converting DOE Technical Standards to Voluntary -2013, Converting DOE Technical Standards to Voluntary Consensus Standards DOE-TSPP-8-2013, Converting DOE Technical Standards to Voluntary Consensus Standards Technical Standards Program Procedures (TSPP) - September 16, 2013 This procedure provides guidance on the conversion of DOE Technical Standards to Voluntary Consensus Standards (VCSs). This procedure applies to all Department of Energy (DOE) Headquarters and field organizations, management and operating contractors, and laboratories (hereafter referred to collectively as Technical Standards Program (TSP) participants) working to the requirements of the latest revision of DOE Order (O) 252.1A, Technical Standards Program. DOE-TSPP-8-2013, Converting DOE Technical Standards to Voluntary Consensus Standards

403

MHK Technologies/Uppsala Seabased AB Wave Energy Converter | Open Energy  

Open Energy Info (EERE)

AB Wave Energy Converter AB Wave Energy Converter < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Uppsala Seabased AB Wave Energy Converter.jpg Technology Profile Primary Organization Uppsala University Division for Electricity Technology Resource Click here Wave Technology Type Click here Point Absorber - Floating Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description The system consists of a linear permanent magnet synchronous generator located on the sea floor The generator is connected directly via a line to a buoy on the surface There are no intermediate energy conversion steps thus the generator motion is the same as the buoy motion Several generators 3 today are connected to a marine substation where the voltage is converted to grid frequency transformed to higher voltage and transmitted to shore All electrical cables throughout the system are fixed i e there are no motions that subject the cables to bending moments

404

Compact self-contained electrical-to-optical converter/transmitter  

DOE Patents (OSTI)

A first optical receiver and a second optical receiver are provided for receiving a calibrate command and a power switching signal, respectively, from a remote processor. A third receiver is provided for receiving an analog electrical signal from a transducer. A calibrator generates a reference signal in response to the calibrate command. A combiner mixes the electrical signal with the reference signal to form a calibrated signal. A converter converts the calibrated signal to an optical signal. A transmitter transmits the optical signal to the remote processor. A primary battery supplies power to the calibrator, the combiner, the converter, and the transmitter. An optically-activated switch supplies power to the calibrator, the combiner, the converter, and the transmitter in response to the power switching signal. An auxiliary battery supplies power continuously to the switch.

Seligmann, Daniel A. (Manteca, CA); Moss, William C. (San Mateo, CA); Valk, Theodore C. (Livermore, CA); Conder, Alan D. (Tracy, CA)

1995-01-01T23:59:59.000Z

405

Converting mill buildings into housing : ways of working with brick walls  

E-Print Network (OSTI)

The mill buildings of New England add a unique dimension to the heritage and identity of the region. Today some of these buildings continue to function as the site of industry, others have been converted to commercial or ...

Pressman, Paul

1981-01-01T23:59:59.000Z

406

Research Projects to Convert Captured CO2 Emissions to Useful Products |  

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

Projects to Convert Captured CO2 Emissions to Useful Projects to Convert Captured CO2 Emissions to Useful Products Research Projects to Convert Captured CO2 Emissions to Useful Products July 6, 2010 - 1:00pm Addthis Washington, DC - Research to help find ways of converting into useful products CO2 captured from emissions of power plants and industrial facilities will be conducted by six projects announced today by the U.S. Department of Energy (DOE). The projects are located in North Carolina, New Jersey, Massachusetts, Rhode Island, Georgia, and Quebec, Canada (through collaboration with a company based in Lexington, Ky.) and have a total value of approximately $5.9 million over two-to-three years, with $4.4 million of DOE funding and $1.5 million of non-Federal cost sharing. The work will be managed by the

407

Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from  

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

Six Projects to Convert Captured CO2 Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products July 22, 2010 - 1:00pm Addthis Washington, DC - U.S. Energy Secretary Steven Chu announced today the selections of six projects that aim to find ways of converting captured carbon dioxide (CO2) emissions from industrial sources into useful products such as fuel, plastics, cement, and fertilizers. Funded with $106 million from the American Recovery and Reinvestment Act -matched with $156 million in private cost-share -today's selections demonstrate the potential opportunity to use CO2 as an inexpensive raw material that can help reduce carbon dioxide emissions while producing useful by-products that Americans

408

Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from  

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

Six Projects to Convert Captured CO2 Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products Secretary Chu Announces Six Projects to Convert Captured CO2 Emissions from Industrial Sources into Useful Products July 22, 2010 - 12:00am Addthis Washington, D.C. - U.S. Energy Secretary Steven Chu announced today the selections of six projects that aim to find ways of converting captured carbon dioxide (CO2) emissions from industrial sources into useful products such as fuel, plastics, cement, and fertilizers. Funded with $106 million from the American Recovery and Reinvestment Act -matched with $156 million in private cost-share -today's selections demonstrate the potential opportunity to use CO2 as an inexpensive raw material that can help reduce carbon dioxide emissions while producing useful by-products that Americans

409

DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur  

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

DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur Distillate DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur Distillate February 1, 2011 - 12:00pm Addthis Washington, DC - The current inventory of the Northeast Home Heating Oil Reserve will be converted to cleaner burning ultra low sulfur distillate to comply with new, more stringent fuel standards by some Northeastern states, the U.S. Department of Energy (DOE) said today. The State of New York and other Northeastern states are implementing more stringent fuel standards that require replacement of high sulfur (2,000 parts per million) heating oil to ultra low sulfur fuel (15 parts per million). As a result, DOE will sell the current inventory of the Northeast

410

Two U.S. University Research Reactors to be Converted From Highly Enriched  

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

U.S. University Research Reactors to be Converted From Highly U.S. University Research Reactors to be Converted From Highly Enriched Uranium to Low-Enriched Uranium Two U.S. University Research Reactors to be Converted From Highly Enriched Uranium to Low-Enriched Uranium April 11, 2005 - 11:34am Addthis WASHINGTON, D.C. - As part of the Bush administration's aggressive effort to reduce the amount of weapons-grade nuclear material worldwide, Secretary of Energy Samuel W. Bodman announced today that the Department of Energy (DOE) has begun to convert research reactors from using highly-enriched uranium (HEU) to low-enriched uranium fuel (LEU) at the University of Florida and Texas A&M University. This effort, by DOE's National Nuclear Security Administration (NNSA) and the Office of Nuclear Energy, Science and Technology, are the latest steps

411

Weekly Wrap-Up: Testing Wind Blades, Converting Carbon Emissions, and  

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

Weekly Wrap-Up: Testing Wind Blades, Converting Carbon Emissions, Weekly Wrap-Up: Testing Wind Blades, Converting Carbon Emissions, and Eco-Driving Weekly Wrap-Up: Testing Wind Blades, Converting Carbon Emissions, and Eco-Driving July 23, 2010 - 5:17pm Addthis Elizabeth Meckes Elizabeth Meckes Director of User Experience & Digital Technologies, Office of Public Affairs On Thursday, Secretary Chu announced six projects that aim to find ways of convert captured carbon dioxide (CO2) emissions from industrial sources into useful products. The innovative projects - funded with $106 million from the American Recovery and Reinvestment Act and matched with $156 million in private cost-share - will seek to use CO2 emissions from industrial sources to create useful products such as fuel, plastics, cement, and fertilizers. Find out more here.

412

DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur  

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

Will Convert Northeast Home Heating Oil Reserve to Ultra Low Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur Distillate DOE Will Convert Northeast Home Heating Oil Reserve to Ultra Low Sulfur Distillate February 1, 2011 - 12:00pm Addthis Washington, DC - The current inventory of the Northeast Home Heating Oil Reserve will be converted to cleaner burning ultra low sulfur distillate to comply with new, more stringent fuel standards by some Northeastern states, the U.S. Department of Energy (DOE) said today. The State of New York and other Northeastern states are implementing more stringent fuel standards that require replacement of high sulfur (2,000 parts per million) heating oil to ultra low sulfur fuel (15 parts per million). As a result, DOE will sell the current inventory of the Northeast Home Heating Oil Reserve, a total of approximately 2 million barrels, and

413

Progress on Converting a NIF Quad to Eight, Petawatt Beams for Advanced Radiography  

Science Conference Proceedings (OSTI)

We are converting a quad of NIF beamlines into eight, short-pulse (1-50 ps), petawatt-class beams for advanced radiography and fast ignition experiments. This paper describes progress toward completing this project.

Crane, J K

2009-10-19T23:59:59.000Z

414

High efficiency resonant dc/dc converter for solar power applications  

E-Print Network (OSTI)

This thesis presents a new topology for a high efficiency dc/dc resonant power converter that utilizes a resistance compression network to provide simultaneous zero voltage switching and near zero current switching across ...

Inam, Wardah

2013-01-01T23:59:59.000Z

415

Single-phase Converter-less Excitation Synchronous Stand-along Wind Power Generator System.  

E-Print Network (OSTI)

??In this thesis, a single-phase converter-less excitation synchronous stand-along wind power generator system is proposed. In order to simplify the system and improve the system… (more)

Lin, Chin-wei

2013-01-01T23:59:59.000Z

416

Radio frequency dc-dc converters : device characterization, topology evaluation, and design  

E-Print Network (OSTI)

High frequency power conversion is attractive for the opportunities it affords for improved performance. Dc-dc converters operating at high frequencies use smaller-valued energy storage elements, which tend to be physically ...

Leitermann, Olivia

2008-01-01T23:59:59.000Z

417

Design of ultra low power analog-to-digital converter for ambulatory EEG recording  

E-Print Network (OSTI)

Portable acquisition of biopotential signals requires the design of compact, energy efficient circuits and systems. Such systems typically include analog-to-digital converter for digitizing signals from AFE and feeding it ...

El-Damak, Dina Reda

2012-01-01T23:59:59.000Z

418

Design of a low-voltage low-power dc-dc HF converter  

E-Print Network (OSTI)

Many portable electronic applications could benefit from a power converter able to achieve high efficiency across wide input and output voltage ranges at a small size. However, it is difficult for many conventional power ...

Hu, Jingying, Ph. D. Massachusetts Institute of Technology.

2008-01-01T23:59:59.000Z

419

Design and evaluation of a very high frequency dc/dc converter  

E-Print Network (OSTI)

This thesis presents a resonant boost topology suitable for very high frequency (VHF, 30-300 MHz) dc-dc power conversion. The proposed design is a fixed frequency, fixed duty ratio resonant converter featuring low device ...

Pilawa-Podgurski, Robert C. N

2007-01-01T23:59:59.000Z

420

Single-inductor, multiple-output buck converter with parallel source transient recovery  

E-Print Network (OSTI)

To address the need for multiple regulated voltage supplies in electronic devices, this thesis presents a modeling and design study of a single-inductor, multiple-output (SIMO) DC-DC buck converter with parallel source ...

King, Charles Jackson, III

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

A zero-crossing based pipelined analog-to-digital converter with supply voltage scalibility  

E-Print Network (OSTI)

A zero-crossing based pipelined analog-to-digital converter (ADC) has been designed and is fabricated in a 65nm CMOS process. The highly digital implementation characteristic of the zero-crossing detection technique enables ...

Lee, Sunghyuk

2010-01-01T23:59:59.000Z

422

High Voltage Thermal Battery Reliability Required to Equal Inverter-Converter Systems  

SciTech Connect

MC-583 and XMC-650 circuits, including associated pulse transformers, are compare with the inverter-converter system typical of present fuses. The required probabilities of thermal battery shorts and opens are determined.

1955-06-14T23:59:59.000Z

423

A single inductor dual input dual output DC-DC converter with hybrid supplies for solar energy harvesting applications  

Science Conference Proceedings (OSTI)

A single inductor dual input dual output (SIDIDO) DC-DC converter is proposed for solar energy harvesting applications. The converter supports hybrid power supplies from both the photovoltaic (PV) cells and the rechargeable battery. Apart from the conventional ... Keywords: DC-DC converter, MPPT, PV cells, dual-input-dual-output, energy harvesting, single inductor

Hui Shao; Chi-Ying Tsui; Wing-Hung Ki

2009-08-01T23:59:59.000Z

424

Direct connection of series self-excited generators and HVDC converters  

Science Conference Proceedings (OSTI)

An alternative and simpler solution is proposed for the direct connection of generators to HVdc converters. The generator exciter windings are connected in series with the output of the HVdc converter and take the place of the conventional smoothing reactor. Existing steady state and time domain simulation programs are modified to represent the behavior of the series direct connection scheme. It is shown that series excitation extends naturally the power transmission capability and permits fast fault clearances.

Arrillaga, J.; Macdonald, S.J.; Watson, N.R.; Watson, S. (Univ. Canterbury, Christchurch (New Zealand))

1993-10-01T23:59:59.000Z

425

Discussion on the control method of the inductor-converter bridge by simulation and experiment  

DOE Green Energy (OSTI)

With the development of the superconducting magnet as an energy storage unit, pulsed power loads between superconducting magnets of increasing magnitude up to several hundred megawatts or more appear within the realm of possibility. An energy storage unit that is independent of the power grid can be used in applications where the pulsed power required from the power grid may cause a hazardous effect on the power system. An energy transfer system between the storage and the load units eliminates the disturbance on the power grid. An inductor-converter bridge is proposed for such a purpose. The inductor-converter bridge (ICB) is a solid state DC-AC-DC converter system for reversible energy transfer between two high-inductance inductors. The converter thyristors are naturally commutated by a set of wye-connected capacitors on the AC lines of the circuit. The circuit is designed so that, in every converter cycle, a very small fraction of the magnet energy is stored in these capacitors. The characteristics of the inductor-converter bridge are briefly summarized as follows: low energy loss, reversibility of the energy transfer direction, controllability of the energy transfer rate, and no conversion to another energy form.

Hirano, M.; Kustom, R.L.

1983-07-01T23:59:59.000Z

426

Design considerations for DC-DC converters in fuel cell systems  

E-Print Network (OSTI)

Rapidly rising fossil fuel costs along with increased environmental awareness has encouraged the development of alternative energy sources. Such sources include fuel cells, wind, solar and ocean tide power. Among them, fuel cells have received increased interest in the recent years. This is mainly due to their high efficiency, modularity, and simple construction. However, due to their low output voltage and wide variation from no load to full load, a power electronics converter is required to interface the fuel cell with its loads. This dissertation focuses on developing a set of considerations that will assist designers of the power electronics converter in the design and optimization of the system. These design considerations are obtained analytically and verified experimentally and allow obtaining an efficient and stable fuel cell – power converter system. In addition to the design guidelines this dissertation presents new power converter topologies that do not require the use of transformers to achieve a large voltage gain. Further a new modular fuel cell power converter system that divides the fuel cell stack to optimize power generation is proposed. It is shown by means of mathematical analysis and experimental prototypes that the proposed solutions contribute to the reduction of size and cost of the power converter as well to increase the efficiency of the system.

Palma Fanjul, Leonardo Manuel

2006-12-01T23:59:59.000Z

427

100kW Energy Transfer Multiplexer Power Converter Prototype Development Project  

DOE Green Energy (OSTI)

Project Final Report for "100kW Energy Transfer Multiplexer Power Converter Prototype Development Project" prepared under DOE grant number DE-FG36-03GO13138. This project relates to the further development and prototype construction/evaluation for the Energy Transfer Multiplexer (ETM) power converter topology concept. The ETM uses a series resonant link to transfer energy from any phase of a multiphase input to any phase of a multiphase output, converting any input voltage and frequency to any output voltage and frequency. The basic form of the ETM converter consists of an eight (8)-switch matrix (six phase power switches and two ground power switches) and a series L-C resonant circuit. Electronic control of the switches allows energy to be transferred in the proper amount from any phase to any other phase. Depending upon the final circuit application, the switches may be either SCRs or IGBTs. The inherent characteristics of the ETM converter include the following: Power processing in either direction (bidirectional); Large voltage gain without the need of low frequency magnetics; High efficiency independent of output load and frequency; Wide bandwidth with fast transient response and; Operation as a current source. The ETM is able to synthesize true sinusoidal waveforms with low harmonic distortions. For a low power PM wind generation system, the ETM has the following characteristics and advantages: It provides voltage gain without the need of low frequency magnetics (DC inductors) and; It has constant high efficiency independent of the load. The ETM converter can be implemented into a PM wind power system with smaller size, reduced weight and lower cost. As a result of our analyses, the ETM offers wind power generation technology for the reduction of the cost and size as well as the increase in performance of low power, low wind speed power generation. This project is the further theoretical/analytical exploration of the ETM converter concept in relationship to PM wind power generator applications in the 100kW and under power range. The theoretical/analytical and bench scale work focuses on simplifying the basic ETM converter topology (in terms of parts count and complexity) for the specific application of the low power PM system. The project goals and objectives were for Spellman HV will develop a 100kW prototype ETM power converter based on paralleled lower ratings converters. The proposed configuration of this prototype is a 100kW rated converter comprised of four (4) 34kW rated modules connected in parallel (the fourth converter is included to demonstrate N+1 fault tolerance). This approach is more viable as there is lower technological risk involved in developing a 34kW-rated converter than a single 100kW unit. The modular system approach should have a lower deployment and service cost over a single unit system, because of the economics of scale (smaller units at a higher volume means lower manufacturing cost) and because of improved serviceability (a non-redundant power system with one failed module will still operate at a lower power level). There is also the added benefit that greater commercial application and acceptance should be achieved by having a modular system available in which fault tolerance (N+1 or 2N) is a feature. This modular approach would allow the output power to be increased by adding more paralleled converters. Thus, the maximum output power of the overall power system is a function of the interconnection medium (the hot swap connection subsystem), rather than the ratings of a single module. The project was implemented with Spellman HV acting as the program management and production assembly and test facility; The Baker Company acting as a technical consultant and resource when required; and dtm Associates acting as the design/development resource for the hardware development of the 100kW ETM converter prototype.

S. Merrill Skeist; Richard H. (Dick) Baker; Anthony G.P. Marini; DOE Project Officer - Keith Bennett

2006-03-21T23:59:59.000Z

428

Dynamic fluid loss in hydraulic fracturing under realistic shear conditions in high-permeability rocks  

SciTech Connect

A study of the dynamic fluid loss of hydraulic fracturing fluids under realistic shear conditions is presented. During a hydraulic fracturing treatment, a polymeric solution is pumped under pressure down the well to create and propagate a fracture. Part of the fluid leaks into the rock formation, leaving a skin layer of polymer or polymer filter cake, at the rock surface or in the pore space. This study focuses on the effects of shear rate and permeability on dynamic fluid-loss behavior of crosslinked and linear fracturing gels. Previous studies of dynamic fluid loss have mainly been with low-permeability cores and constant shear rates. Here, the effect of shear history and fluid-loss additive on the dynamic leakoff of high-permeability cores is examined.

Navarrete, R.C.; Cawiezel, K.E.; Constien, V.G. [Dowell Schlumberger, Tulsa, OK (United States)

1996-08-01T23:59:59.000Z

429

On Shear-Generated Gravity Waves that Reach the Mesosphere. Part I: Wave Generation  

Science Conference Proceedings (OSTI)

A long unresolved issue in nonorographic gravity wave generation is whether there is significant emission from Kelvin–Helmholtz (KH) shear instability in the lower stratosphere, for instance, just above tropopause jets. Such emission has often ...

Oliver Bühler; Michael E. McIntyre; John F. Scinocca

1999-11-01T23:59:59.000Z

430

Final Report - Investigation of Intermittent Turbulence and Turbulent Structures in the Presence of Controlled Sheared Flows  

SciTech Connect

Final Report for grant DE-FG02-06ER54898. The dynamics and generation of intermittent plasma turbulent structures, widely known as "blobs" have been studied in the presence of sheared plasma flows in a controlled laboratory experiment.

Gilmore, Mark A. [University of New Mexico

2013-06-27T23:59:59.000Z

431

An auxiliary capacitor based ultra-fast drive circuit for shear piezoelectric motors  

E-Print Network (OSTI)

Shear piezoelectric motors frequently require large voltage changes on very short time scales. Since piezos behave electrically as capacitors, this requires a drive circuit capable of quickly sourcing or sinking a large ...

Chatterjee, Kamalesh

432

Microstructural evolution in adiabatic shear bands of copper at high strain rates: Electron backscatter diffraction characterization  

SciTech Connect

The microstructural evolution of adiabatic shear bands in annealed copper with different large strains at high strain rates has been investigated by electron backscatter diffraction. The results show that mechanical twinning can occur with minimal contribution to shear localization under dynamic loading. Elongated ultrafine grains with widths of 100-300 nm are observed during the evolution of the adiabatic shear bands. A rotational dynamic recrystallization mechanism is proposed to explain the formation of the elongated ultrafine grains. - Highlights: Black-Right-Pointing-Pointer The microstructural evolution of ASB is studied by electron backscatter diffraction. Black-Right-Pointing-Pointer Twinning can occur in ASB while the contribution to shear localization is slight. Black-Right-Pointing-Pointer Elongated ultrafine grains are observed during the evolution process of ASB. Black-Right-Pointing-Pointer A possible mechanism is proposed to explain the microstructure evolution of ASB.

Tang Lin [School of Materials Science and Engineering, Central South University, Changsha 410083 (China); Chen Zhiyong, E-mail: czysh@netease.com [School of Materials Science and Engineering, Central South University, Changsha 410083 (China); Zhan Congkun; Yang Xuyue; Liu Chuming [School of Materials Science and Engineering, Central South University, Changsha 410083 (China); Cai Hongnian [School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081 (China)

2012-02-15T23:59:59.000Z

433

The Downwind Spread of an Initially Vertical Column of Particles in a Sheared Environment  

Science Conference Proceedings (OSTI)

The effects of particle fallspeeds on the downwind spread of initially vertical columns or curtains are examined in environments with wind shear. Sets of equations describing the column width as a function of time and distance below column top ...

Ronald E. Stewart; John D. Marwitz

1982-08-01T23:59:59.000Z

434

Nocturnal Wind Direction Shear and Its Potential Impact on Pollutant Transport  

Science Conference Proceedings (OSTI)

The potential effects of vertical wind direction shear on pollutant transport at a complicated, semiarid site are examined using tower measurements. This high-elevation site is situated on a sloping plateau between mountains to the west and a ...

Brent M. Bowen; Jeffrey A. Baars; Gregory L. Stone

2000-03-01T23:59:59.000Z

435

Organization of Tropical Convection in Low Vertical Wind Shears: The Role of Water Vapor  

Science Conference Proceedings (OSTI)

A modeling study is conducted to gain insight into the factors that control the intensity and organization of tropical convection, and in particular to examine if organization occurs in the absence of factors such as vertical wind shear or ...

Adrian M. Tompkins

2001-03-01T23:59:59.000Z

436

Seismic Performance, Modeling, and Failure Assessment of Reinforced Concrete Shear Wall Buildings  

E-Print Network (OSTI)

Post- Tensioned Concrete Buildings,” PEER Report 2011/104,RC shear walls in high-rise buildings,” The Young ResearcherExtended 3D Analysis of Building Structures, Computers and

Tuna, Zeynep

2012-01-01T23:59:59.000Z

437

On O-X mode conversion in 2D inhomogeneous plasma with a sheared magnetic field  

E-Print Network (OSTI)

The conversion of an ordinary wave to an extraordinary wave in a 2D inhomogeneous slab model of the plasma confined by a sheared magnetic field is studied analytically.

A Yu Popov

2009-08-10T23:59:59.000Z

438

Effect of Vertical Wind Shear on Numerically Simulated Multicell Storm Structure  

Science Conference Proceedings (OSTI)

A strictly two-dimensional cloud model was used to gauge the effect of vertical wind shear on the mature phase behavior of model-simulated multicellular storms, extending the previous work of the authors. We specifically examined the propagation ...

Robert G. Fovell; Yoshi Ogura

1989-10-01T23:59:59.000Z

439

Global Abyssal Mixing Inferred from Lowered ADCP Shear and CTD Strain Profiles  

Science Conference Proceedings (OSTI)

Internal wave–wave interaction theories and observations support a parameterization for the turbulent dissipation rate ? and eddy diffusivity K that depends on internal wave shear Vz2 and strain ?z2 variances. Its latest incarnation is ...

Eric Kunze; Eric Firing; Julia M. Hummon; Teresa K. Chereskin; Andreas M. Thurnherr

2006-08-01T23:59:59.000Z

440

The study of shear and longitudinal velocity measurements of sands and cohesive soils  

E-Print Network (OSTI)

This thesis evaluates some methods for the measurement of stiffness parameters of soils, with an emphasis on the use of bender element technology in obtaining the shear modulus. The experimental program consisted two primary ...

Marjanovic, Jana

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

Transient Dynamics of Nonsymmetric Perturbations versus Symmetric Instability in Baroclinic Zonal Shear Flows  

Science Conference Proceedings (OSTI)

The linear dynamics of symmetric and nonsymmetric perturbations in unbounded zonal inviscid flows with a constant vertical shear of velocity, when a fluid is incompressible and density is stably stratified along the vertical and meridional ...

G. R. Mamatsashvili; V. S. Avsarkisov; G. D. Chagelishvili; R. G. Chanishvili; M. V. Kalashnik

2010-09-01T23:59:59.000Z

442

Interactions of Cold- and Warm-Core Rings with Environmental Shear  

Science Conference Proceedings (OSTI)

A two-layer analytical model of cold- and warm-core rings has been constructed to explore steady interactions of isolated eddies with horizontally sheared flows around and below the eddies. Steady inviscid solutions to the quasi-geostrophic ...

Doron Nof; Chuan Shi

1989-07-01T23:59:59.000Z

443

Stochastic Models of Shear-Flow Turbulence with Enstrophy Transfer to Subgrid Scales  

Science Conference Proceedings (OSTI)

A stochastic model for shear-flow turbulence is constructed under the constraint that the parameterized nonlinear eddy–eddy interactions conserve energy but dissipate potential enstrophy. This parameterization is appropriate for truncated models ...

Timothy DelSole

1999-11-01T23:59:59.000Z

444

THIRD MOMENTS AND THE ROLE OF ANISOTROPY FROM VELOCITY SHEAR IN THE SOLAR WIND  

Science Conference Proceedings (OSTI)

We have extended the recent analyses of magnetohydrodynamic third moments as they relate to the turbulent energy cascade in the solar wind to consider the effects of large-scale shear flows. Moments from a large set of Advanced Composition Explorer data have been taken, and chosen data intervals are characterized by the rate of change in the solar wind speed. Mean dissipation rates are obtained in accordance with the predictions of homogeneous shear-driven turbulence. Agreement with predictions is best made for rarefaction intervals where the solar wind speed is decreasing with time. For decreasing speed intervals, we find that the dissipation rates increase with increasing shear magnitude and that the shear-induced fluctuation anisotropy is consistent with a relatively small amount.

Stawarz, Joshua E.; Vasquez, Bernard J.; Smith, Charles W. [Physics Department, Space Science Center, University of New Hampshire, Durham, NH 03824 (United States); Forman, Miriam A. [Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800 (United States); Klewicki, Joseph, E-mail: jek32@cisunix.unh.edu, E-mail: Bernie.Vasquez@unh.edu, E-mail: Charles.Smith@unh.edu, E-mail: Miriam.Forman@sunysb.edu, E-mail: Joe.Klewicki@unh.edu [Mechanical Engineering Department, University of New Hampshire, Durham, NH 03824 (United States)

2011-07-20T23:59:59.000Z

445

Empirical Models of the Eddy Heat Flux and Vertical Shear on Short Time Scales  

Science Conference Proceedings (OSTI)

The relationship between the eddy heat flux and vertical shear in the extratropical atmosphere is studied by developing various linear stochastic models fitted to the observed January and July Northern Hemispheric data. Models are univariate or ...

Steven J. Ghan

1984-02-01T23:59:59.000Z

446

Effect of Asymmetric Rolling on Plastic Anisotropy of Low Carbon Steels during Simple Shear Tests  

Science Conference Proceedings (OSTI)

Simple shear tests are performed on low carbon steel pre-deformed in conventional, asymmetric and orthogonal-asymmetric rolling. The simple-shear tests were carried out at 0 deg. , 45 deg. and 135 deg. with respect to the previous rolling direction. For a reduction ratio of 15%, a transient stagnation in the hardening rate is observed at reloading for all changes in strain path. The shear stress level, the hardening rate and extent of the plateau appear to be insensitive to the preliminary applied rolling conditions. After a reduction ratio of 50%, plastic instability was detected at reloading for all the changes of strain path and rolling conditions studied. A specific heat treatment was then designed allowing the material to become ductile after rolling while retaining the fine microstructure and therefore the high strength. Promising results were obtained essentially for 45 deg. shear tests.

Gracio, J. J.; Vincze, G.; Panigrahi, B. B. [Centro de Tecnologia Mecanica e Automacao, Departamento de Engenharia Mecanica, Universidade de Aveiro, 3810-193 Aveiro (Portugal); Kim, H. J. [Materials Mechanics Laboratory(MML), Graduate Institute of Ferrous Technology(GIFT), Pohang University of Science and Technology, San 31 Hyoja-Dong, Nam-Gu, Pohang, Gyeongbuk, 790-784 (Korea, Republic of); Barlat, F. [Materials Mechanics Laboratory(MML), Graduate Institute of Ferrous Technology(GIFT), Pohang University of Science and Technology, San 31 Hyoja-Dong, Nam-Gu, Pohang, Gyeongbuk, 790-784 (Korea, Republic of); Centro de Tecnologia Mecanica e Automacao, Departamento de Engenharia Mecanica, Universidade de Aveiro, 3810-193 Aveiro (Portugal); Rauch, E. F. [Science Ingenierie des Materiaux and Procede s, GPM2 (CNRS UMR 5266) INPG-UJF, BP 46, 38402 Saint Martin d'Heres Cedex (France); Yoon, J. W. [Alloy Technology and Material Research Division, Alcoa Technical Center, 100 Technical Drive, Alcoa Center, PA 15069-0001 (United States); Centro de Tecnologia Mecanica e Automacao, Departamento de Engenharia Mecanica, Universidade de Aveiro, 3810-193 Aveiro (Portugal)

2010-06-15T23:59:59.000Z

447

Spaced-Antenna Interferometry to Measure Crossbeam Wind, Shear, and Turbulence: Theory and Formulation  

Science Conference Proceedings (OSTI)

The theory of measuring crossbeam wind, shear, and turbulence within the radar’s resolution volume V6 is described. Spaced-antenna weather radar interferometry is formulated for such measurements using phased-array weather radar. The formulation ...

Guifu Zhang; Richard J. Doviak

2007-05-01T23:59:59.000Z

448

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

2013-11-01T23:59:59.000Z

449

A Phenomenological Model for Wind Speed and Shear Stress Profiles in Vegetation Cover Layers  

Science Conference Proceedings (OSTI)

A phenomenological model for the mean wind speed and Reynolds shear stress profiles with height in a vegetation cover layer is derived from forms suggested by truncation of the equations of turbulent fluid motion at second order in fluctuating ...

F. A. Albini

1981-11-01T23:59:59.000Z

450

Stably Stratified Shear Turbulence: A New Model for the Energy Dissipation Length Scale  

Science Conference Proceedings (OSTI)

A model is presented to compute the turbulent kinetic energy dissipation length scale l? in a stably stratified shear flow. The expression for l? is derived from solving the spectral balance equation for the turbulent kinetic energy. The buoyancy ...

Y. Cheng; V. M. Canuto

1994-08-01T23:59:59.000Z

451

Hybrid Electron-Positron-Ion Shear Flows and Applications to Gamma-Ray Bursts  

E-Print Network (OSTI)

We present Particle-in-Cell simulation results of relativistic shear boundary layers for hybrid electron-positron-ion plasmas and discuss their potential applications to gamma-ray bursts.

Liang, Edison; Smith, Ian

2013-01-01T23:59:59.000Z

452

Vertical Wind Shear Influences on Tropical Cyclone Formation and Intensification during TCM-92 and TCM-93  

Science Conference Proceedings (OSTI)

Vertical wind shears between 200 and 850 mb are calculated from operational analyses and special interactive analyses for Tropical Storm Steve during the Tropical Cyclone Motion (TCM-93) field experiment and for Typhoon Omar at the end of the TCM-...

Russell L. Elsberry; Richard A. Jeffries

1996-07-01T23:59:59.000Z

453

Horizontal Distribution and Characteristics of Shear Layers in the Seasonal Thermocline  

Science Conference Proceedings (OSTI)

High-resolution velocity shear, CTD, and microstructure measurements were made simultaneously from the research submarine Dolphin in Monterey Bay in October 1984. During three consecutive dives, the Dolphin cycled between the surface and 110 m ...

E. C. Itsweire; T. R. Osborn; T. P. Stanton

1989-03-01T23:59:59.000Z

454

Dynamics of long flexible cylinders at high-mode number in uniform and sheared flows  

E-Print Network (OSTI)

The primary objective of this thesis is to characterize the response of risers at high-mode numbers in sheared and uniform ocean currents. As part of this thesis work, three separate experiments have been planned and ...

Swithenbank, Susan B. (Susan Brenda)

2007-01-01T23:59:59.000Z

455

Modeling the relation between suction, effective stress and shear strength in partially saturated granular media  

E-Print Network (OSTI)

Decades of geotechnical research firmly established that the mechanical properties (shear strength and deformation characteristics) of soils are related to soil's "effective stress", i.e. the stress carried by the solid ...

Toker, Nabi Kartal, 1979-

2007-01-01T23:59:59.000Z

456

Effects of Vertical Wind Shear and Storm Motion on Tropical Cyclone Rainfall Asymmetries Deduced from TRMM  

Science Conference Proceedings (OSTI)

Vertical wind shear and storm motion are two of the most important factors contributing to rainfall asymmetries in tropical cyclones (TCs). Global TC rainfall structure, in terms of azimuthal distribution and asymmetries relative to storm motion, ...

Shuyi S. Chen; John A. Knaff; Frank D. Marks Jr.

2006-11-01T23:59:59.000Z

457

Modeling the mechanical behavior of amorphous metals by shear transformation zone dynamics  

E-Print Network (OSTI)

A new mesoscale modeling technique for the thermo-mechanical behavior of amorphous metals is proposed. The modeling framework considers the shear transformation zone (STZ) as the fundamental unit of deformation, and ...

Homer, Eric Richards, 1980-

2010-01-01T23:59:59.000Z

458

The Effect of Tilted Rotation on Shear Instabilities at Low Stratifications  

Science Conference Proceedings (OSTI)

A linear stability analysis of the inviscid stratified Boussinesq equations is presented given a steady zonal flow with constant vertical shear in a tilted f plane. Full nonhydrostatic terms are included: 1) acceleration of vertical velocity and ...

Nicole Jeffery; Beth Wingate

2009-12-01T23:59:59.000Z

459

Dynamics and control of internal transport barriers in reversed shear discharges  

E-Print Network (OSTI)

on the Hahm and Burrell28 exten- sion of the BDT criterion.20 The shearing rate is given by s r r r q r qEr r

Newman, David

460

Forecasting Tornadic Thunderstorm Potential in Alberta Using Environmental Sounding Data. Part I: Wind Shear and Buoyancy  

Science Conference Proceedings (OSTI)

This study investigates, for Alberta, Canada, whether observed sounding parameters such as wind shear and buoyant energy can be used to help distinguish between thunderstorms with significant (F2–F5) tornadoes, thunderstorms with weak (F0–F1) ...

Max L. Dupilka; Gerhard W. Reuter

2006-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" 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

External Prestressed Carbon Fiber-Reinforced Polymer Straps for Shear Enhancement of Concrete  

E-Print Network (OSTI)

, nonlaminated, carbon fiber-reinforced polymer (CFRP) straps as external shear reinforcement for concrete. Experiments were carried out on an unstrengthened control beam and beams strengthened with external CFRP straps. It was found that the ultimate load...

Lees, Janet M.; Winistörfer, A. U.; Meier, U.

2002-10-15T23:59:59.000Z

462

Nonlinear electron-magnetohydrodynamic simulations of three dimensional current shear instability  

Science Conference Proceedings (OSTI)

This paper deals with detailed nonlinear electron-magnetohydrodynamic simulations of a three dimensional current shear driven instability in slab geometry. The simulations show the development of the instability in the current shear layer in the linear regime leading to the generation of electromagnetic turbulence in the nonlinear regime. The electromagnetic turbulence is first generated in the unstable shear layer and then spreads into the stable regions. The turbulence spectrum shows a new kind of anisotropy in which power transfer towards shorter scales occurs preferentially in the direction perpendicular to the electron flow. Results of the present three dimensional simulations of the current shear instability are compared with those of our earlier two dimensional simulations of sausage instability. It is found that the flattening of the mean velocity profile and thus reduction in the electron current due to generation of electromagnetic turbulence in the three dimensional case is more effective as compared to that in the two dimensional case.

Jain, Neeraj [Max Planck Institute for Solar System Research, Max-Planck-Str. 2, 37191 Katlenburg-Lindau (Germany); Das, Amita; Sengupta, Sudip; Kaw, Predhiman [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2012-09-15T23:59:59.000Z

463

Baroclinic Adjustment in a Two-Level Model with Barotropic Shear  

Science Conference Proceedings (OSTI)

Baroclinic instability in two-level models is characterized by a critical vertical shear, for values above which the flow is unstable. Existing studies of nonlinear baroclinic equilibration in two-level models suggest that, while equilibration ...

Gerard H. Roe; Richard S. Lindzen

1996-09-01T23:59:59.000Z

464

Using a Broadband ADCP in a Tidal Channel. Part I: Mean Flow and Shear  

Science Conference Proceedings (OSTI)

This paper discusses the principles of measuring the mean velocity and its vertical shear in a turbulent flow using an acoustic Doppler current profiler (ADCP), and presents an analysis of data gathered in a tidal channel. The assumption of ...

Youyu Lu; Rolf G. Lueck

1999-11-01T23:59:59.000Z

465

A Two-Dimensional Primitive Equation Model of Frontogenesis Forced by Confluence and Horizontal Shear  

Science Conference Proceedings (OSTI)

A two-dimensional primitive equation model of frontogenesis forced by a combination of confluence and horizontal shear is formulated for dry, nearly adiabatic and inviscid conditions. The frontogenetical forcing mechanisms are included by ...

Daniel Keyser; Michael J. Pecnick

1985-06-01T23:59:59.000Z

466

Effects of Tropospheric Wind Shear on the Spectrum of Convectively Generated Gravity Waves  

Science Conference Proceedings (OSTI)

The authors examine the effects of tropospheric wind shear on the phase speed spectrum of gravity waves generated by tropical convection. A two-dimensional cloud-resolving model is used to perform numerous squall line simulations with the ...

Jadwiga H. Beres; M. Joan Alexander; James R. Holton

2002-06-01T23:59:59.000Z

467

Kinematic, Dynamic, and Thermodynamic Analysis of a Weakly Sheared Severe Thunderstorm over Northern Alabama  

Science Conference Proceedings (OSTI)

A kinematic, dynamic, and thermodynamic analysis of a weakly sheared, airmass thunderstorm observed over northern Alabama is presented. Most notable is the fact that the dominant cell in this storm closely resembles the Byers and Braham model for ...

David E. Kingsmill; Roger M. Wakimoto

1991-02-01T23:59:59.000Z

468

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

469

Direct Determination of Wind Shears from the Gradients of Satellite Radiance Observations  

Science Conference Proceedings (OSTI)

To the extent that the stratosphere wind field is close to geostrophic, the thermal wind is a good approximation to the vertical wind shear (vertical variation of the horizontal wind). And since the thermal wind is proportional to the horizontal ...

George Ohring; Binyamin Neeman; Louis D. Duncan

1981-11-01T23:59:59.000Z

470

A Model for a Shear-Free Convective Boundary Layer with Parameterized Capping Inversion Structure  

Science Conference Proceedings (OSTI)

The paper extends Deardorff's general structure parameterization for a shear-free convective boundary layer. The model suggested employs the mixed layer hypothesis that the buoyancy (which is defined as b = g(?0 ? &rho)/?0, where ? is the density,...

E. E. Fedorovich; D. V. Mironov

1995-01-01T23:59:59.000Z

471

Development of a Nationwide, Low-Level Wind Shear Mosaic in France  

Science Conference Proceedings (OSTI)

An algorithm for the detection of horizontal wind shear at low levels was developed. The algorithm makes use of data collected by all radars from the Application Radar à la Météorologie Infra-Synoptique (ARAMIS) operational network, in order to ...

Clotilde Augros; Pierre Tabary; Adrien Anquez; Jean-Marc Moisselin; Pascal Brovelli; Olivier Bousquet

2013-10-01T23:59:59.000Z

472

Effects of Diabatic Cooling in a Shear Flow with a Critical Level  

Science Conference Proceedings (OSTI)

The response of a two-dimensional, stably stratified shear flow to diabatic cooling, which represents the evaporative cooling of falling precipitation in the subcloud layer, is examined using both a linear analytical theory and a nonlinear ...

Yuh-Lang Lin; Hye-Yeong Chun

1991-12-01T23:59:59.000Z

473

Low-Frequency Equatorial Waves in Vertically Sheared Zonal Flow. Part I: Stable Waves  

Science Conference Proceedings (OSTI)

The mechanism by which a vertically sheared zonal flow affects large-scale, low-frequency equatorial waves is investigated with two-level equatorial,?-plane and spherical coordinates models.

Bin Wang; Xiaosu Xie

1996-02-01T23:59:59.000Z

474

A flow modeling of lubricating greases under shear deformation by cellular automata  

Science Conference Proceedings (OSTI)

A Cellular Automata modeling of the lubricating grease flow under the shear deformation is proposed Lubricating greases are composed of thickening agent, liquid lubricant and various kinds of additives The thickening agent forms fibrous microstructures ...

Shunsuke Miyamoto; Hideyuki Sakai; Toshihiko Shiraishi; Shin Morishita

2006-09-01T23:59:59.000Z

475

The Interaction of Equatorial Kelvin Waves with Realistically Sheared Zonal Currents  

Science Conference Proceedings (OSTI)

We investigate the interaction of baroclinic equatorial Kelvin waves with realistically sheared background zonal currents in a linearized, continuously stratified model. The background flows are in thermal wind balance and allowed to vary ...

M. J. McPhaden; J. A. Proehl; L. M. Rothstein

1986-09-01T23:59:59.000Z

476

Anomalous shear wave attenuation in the shallow crust beneath the Coso  

Open Energy Info (EERE)

Anomalous shear wave attenuation in the shallow crust beneath the Coso Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic region, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic region, California Details Activities (1) Areas (1) Regions (0) Abstract: We use seismograms of local earthquakes to image relative shear wave attenuation structure in the shallow crust beneath the region containing the Coso volcanic-geothermal area of eastern California. SV and P wave amplitudes were measured from vertical component seismograms of earthquakes that occurred in the Coso-southern Sierra Nevada region from July 1983 to 1985. Seismograms of 16 small earthquakes show SV amplitudes which are greatly diminished at some azimuths and takeoff angles,

477

The Effects of Vertical Wind Shear on the Distribution of Convection in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The influence of vertical wind shear on the azimuthal distribution of cloud-to-ground lightning in tropical cyclones was examined using flash locations from the National Lightning Detection Network. The study covers 35 Atlantic basin tropical ...

Kristen L. Corbosiero; John Molinari

2002-08-01T23:59:59.000Z

478

New Conservation Laws for Linear Quasi-Geostrophic Waves in Shear  

Science Conference Proceedings (OSTI)

There exists an infinite set of quadratic conserved quantities for linear quasi-geostrophic waves in horizontal and vertical shear, the first two members of the set corresponding to the pseudomomentum and pseudo-energy conservation laws that lead ...

Isaac M. Held

1987-08-01T23:59:59.000Z

479

Applications of an Infrared Doppler Lidar in Detection of Wind Shear  

Science Conference Proceedings (OSTI)

In December 2005, operational wind shear alerting at the Hong Kong International Airport (HKIA) reached an important milestone with the launch of the automatic Lidar (light detection and ranging) Windshear Alerting System (LIWAS). This signifies ...

C. M. Shun; P. W. Chan

2008-05-01T23:59:59.000Z

480

Nonequilibrium roughening of interfaces in crystals under shear: application to ball milling  

SciTech Connect

A simple kinetic atomistic model is proposed for describing crystals submitted to sustained shearing, acting in competition with thermally activated diffusion. Monte Carlo simulations are performed on alloys with positive heats of mixing. The results provide a clear understanding of recent experiments showing that chemical mixing of immiscible elements can be induced by ball milling. At moderate shearing rates, an analytical model shows that such driven systems exhibit nonequilibrium roughening.

Bellon, P.; Averback, R.S. (Department of Materials Science and Engineering, 1304 W. Green Street, Urbana, Illinois 61801 (United States))

1995-03-06T23:59:59.000Z

Note: This page contains sample records for the topic "3-dimensional converted shear" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Precracked RC T-beams Repaired in Shear with Externally Bonded CFRP Sheets  

E-Print Network (OSTI)

, strengthening and repair of existing structures, advanced numerical analyses, glass fiber reinforced polymer pipelines and sustainable concrete. Chris Morley is a former Senior Lecturer in Concrete Structures at Cambridge University, UK. He has always been... effective since only a fairly short bonded length is available for force transfer. Another explanation could be that the “deeper” beams had more CFRP area bridging a shear crack compared to the “shallower” beams. Shear force-deflection relationship...

Dirar, Samir; Lees, Janet M.; Morley, Chris T.

2012-03-01T23:59:59.000Z

482

Multiple solutions of gravity and surface shear driven thin film flows over a rectangular cavity  

Science Conference Proceedings (OSTI)

The effect of surface shear stress on the two-dimensional flow of a thin film over a rectangular cavity is investigated by the numerical simulation of the problem in terms of its corresponding Stokes formulation. The integral representation of the problem is numerically solved by a direct boundary element method(BEM) with primitive variables of velocity and surface traction. For cases in which the applied surface shear and the gravity act in opposite directions

N. H. Shuaib; H. Power; S. Hibberd

2006-01-01T23:59:59.000Z

483

Shear Properties at the PyC/SiC Interface of TRISO-Coating  

SciTech Connect

The fracture behavior of TRISO-coated fuel particles depends significantly on the shear strength at the interface between the inner pyrolytic carbon (PyC) and silicon carbide (SiC) coatings. In this study, a micro-indentation fiber push-out test was applied to evaluate the interfacial shear properties of a model TRISO-coated tube. Specifically, a non-linear shear-lag model for a transversely isotropic composite material was developed because the existing isotropic models often overestimate the results. In the model, the effects of thermal residual stresses and the roughness-induced clamping stress were considered because of a particular importance. The rigorous model proposed in this study provides more reasonable data on two important interfacial shear parameters: an interfacial debond shear strength and an interfacial friction stress. The modified model gives the interfacial debond shear strength of 180 40 MPa. Such an unusually high interfacial strength, even though the value was comparably lower than that obtained by the existing isotropic model (~280 MPa), could allow significant loads to be transferred between the inner PyC and SiC in application, potentially leading to failure of the SiC layer. On the other hand, the interfacial friction stress of 120 30 MPa was measured. The considerably high friction stress is attributed primarily to the roughness at the cracked interface rather than the thermal effect. PACS: 68.35.Ct; 68.35.Gy; 81.05.Je; 81.70.Bt

Nozawa, Takashi [ORNL; Snead, Lance Lewis [ORNL; Katoh, Yutai [ORNL; Miller, James Henry [ORNL

2007-01-01T23:59:59.000Z

484

FINAL REPORT OF RESEARCH ON CuxS/ (Cd,Zn)S PHOTOVOLTAIC SOLAR ENERGY CONVERTERS 3/77 - 9/79  

E-Print Network (OSTI)

Cu X S/(Cd,Zn)S PHOTOVOLTAIC SOLAR ENERGY CONVERTERS 3/77 -of Research on Photovoltaic Solar Energy Converters CuxSI(Cd

Chin, B.L.

2013-01-01T23:59:59.000Z

485

On proton CT reconstruction using MVCT-converted virtual proton projections  

Science Conference Proceedings (OSTI)

Purpose: To describe a novel methodology of converting megavoltage x-ray projections into virtual proton projections that are otherwise missing due to the proton range limit. These converted virtual proton projections can be used in the reconstruction of proton computed tomography (pCT). Methods: Relations exist between proton projections and multispectral megavoltage x-ray projections for human tissue. Based on these relations, these tissues can be categorized into: (a) adipose tissue; (b) nonadipose soft tissues; and (c) bone. These three tissue categories can be visibly identified on a regular megavoltage x-ray computed tomography (MVCT) image. With an MVCT image and its projection data available, the x-ray projections through heterogeneous anatomy can be converted to the corresponding proton projections using predetermined calibration curves for individual materials, aided by a coarse segmentation on the x-ray CT image. To show the feasibility of this approach, mathematical simulations were carried out. The converted proton projections, plotted on a proton sinogram, were compared to the simulated ground truth. Proton stopping power images were reconstructed using either the virtual proton projections only or a blend of physically available proton projections and virtual proton projections that make up for those missing due to the range limit. These images were compared to a reference image reconstructed from theoretically calculated proton projections. Results: The converted virtual projections had an uncertainty of {+-}0.8% compared to the calculated ground truth. Proton stopping power images reconstructed using a blend of converted virtual projections (48%) and physically available projections (52%) had an uncertainty of {+-}0.86% compared with that reconstructed from theoretically calculated projections. Reconstruction solely from converted virtual proton projections had an uncertainty of {+-}1.1% compared with that reconstructed from theoretical projections. If these images are used for treatment planning, the average proton range uncertainty is estimated to be less than 1.5% for an imaging dose in the milligray range. Conclusions: The proposed method can be used to convert x-ray projections into virtual proton projections. The converted proton projections can be blended with existing proton projections or can be used solely for pCT reconstruction, addressing the range limit problem of pCT using current therapeutic proton machines.

Wang Dongxu; Mackie, T. Rockwell; Tome, Wolfgang A. [Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705 and Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242 (United States); Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705 and Morgridge Institute of Research, University of Wisconsin, Madison, Wisconsin 53715 (United States); Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705 and Oncophysics Institute, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York 10461 (United States)

2012-06-15T23:59:59.000Z

486

Glass material oxidation and dissolution system: Converting miscellaneous fissile materials to glass  

SciTech Connect

The cold war and the development of nuclear energy have resulted in significant inventories of miscellaneous fissile materials (MFMs). MFMs include (1) plutonium scrap and residue, (2) miscellaneous spent nuclear fuel (SNF), (3) certain hot cell wastes, and (4) many one-of-a-kind materials. Major concerns associated with the long-term management of these materials include: safeguards and nonproliferation issues; health, environment, and safety concerns. waste management requirements; and high storage costs. These issues can be addressed by converting the MFMs to glass for secure, long-term storage or repository disposal; however, conventional glass-making processes require oxide-like feed materials. Converting MFMs to oxide-like materials with subsequent vitrification is a complex and expensive process. A new vitrification process has been invented, the Glass Material Oxidation and Dissolution System (GMODS), which directly converts metals, ceramics, and amorphous solids to glass; oxidizes organics with the residue converted to glass; and converts chlorides to borosilicate glass and a secondary sodium chloride (NaCl) stream. Laboratory work has demonstrated the conversion of cerium (a plutonium surrogate), uranium, Zircaloy, stainless steel, multiple oxides, and other materials to glass. However, significant work is required to develop GMODS further for applications at an industrial scale. If implemented, GMODS will provide a new approach to manage these materials.

Forsberg, C.W.; Ferrada, J.J.

1996-03-19T23:59:59.000Z

487

Digital multimode buck converter control with loss-minimizing synchronous rectifier adaptation  

E-Print Network (OSTI)

Abstract—This paper develops a multimode control strategy which allows for efficient operation of the buck converter over a wide load range. A method for control of synchronous rectifiers as a direct function of the load current is introduced [1]. The function relating the synchronous-rectifier timing to the load current is optimized on-line with a gradient power-loss-minimizing algorithm. Only low-bandwidth measurements of the load current and a power-loss-related quantity are required, making the technique suitable for digital controller implementations. Compared to alternative loss-minimizing approaches, this method has superior adjustment speed and robustness to disturbances, and can simultaneously optimize multiple parameters. The proposed synchronous-rectifier control also accomplishes an automatic, optimal transition to discontinuous-conduction mode at light load. Further, by imposing a minimum duty-ratio, the converter automatically enters pulse-skipping mode at very light load. Thus, the same controller structure can be used in both fixed-frequency pulsewidth modulation and variable-frequency pulse-skipping modes. These techniques are demonstrated on a digitally-controlled 100-W buck converter. Index Terms—Adaptive control, dead-time, digital control, gradient methods, multimode control, optimization methods, pulse skipping, pulsewidth modulated (PWM) power converters, pulsewidth modulation (PWM), synchronous rectifier (SR), variable frequency control. Fig. 1. Buck converter with SR (M), and the corresponding MOSFET control signals.

Angel V. Peterchev; Seth R. S

2006-01-01T23:59:59.000Z

488

MHK Technologies/Multi Absorbing Wave Energy Converter MAWEC | Open Energy  

Open Energy Info (EERE)

Absorbing Wave Energy Converter MAWEC Absorbing Wave Energy Converter MAWEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Multi Absorbing Wave Energy Converter MAWEC.jpg Technology Profile Primary Organization Leancon Wave Energy Project(s) where this technology is utilized *MHK Projects/Leancon Real Sea Test Technology Resource Click here Wave Technology Type Click here Oscillating Wave Surge Converter Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description MAWEC is an OWC wave energy converter that works differently from other OWCs in that it concurrently utilizes pressure and suck. This gives the wanted effect that the vertical force on the WEC is zero when the WEC stretches over more than one wave length. The device is V-shaped and oriented perpendicular to wave direction. The device consists of a number of vertical air tubes, and when a wave passes, air is pushed into a pressure channel that sucks air out of the suck channel. During one wave period each tube (120 in total) goes through a sequence where air is first pushed into a pressure channel when the wave is rising and is later sucked from the pressure channel when the wave is falling. In this situation there is constant pressure in the pressure channel and the air flow through the turbines is constant.

489

Scientists Discover how Bacteria Convert Mercury to Toxic Form | U.S. DOE  

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

Scientists Discover how Bacteria Convert Mercury to Toxic Form Scientists Discover how Bacteria Convert Mercury to Toxic Form Biological and Environmental Research (BER) BER Home About Research Facilities Science Highlights Searchable Archive of BER Highlights External link Benefits of BER Funding Opportunities Biological & Environmental Research Advisory Committee (BERAC) News & Resources Contact Information Biological and Environmental Research U.S. Department of Energy SC-23/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3251 F: (301) 903-5051 E: sc.ber@science.doe.gov More Information » April 2013 Scientists Discover how Bacteria Convert Mercury to Toxic Form Two genes responsible for mercury methylation identified. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo

490

DC to DC power converters and methods of controlling the same  

DOE Patents (OSTI)

A power generation system configured to provide direct current (DC) power to a DC link is described. The system includes a first power generation unit configured to output DC power. The system also includes a first DC to DC converter comprising an input sect