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Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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.


1

Three dimensional marine seismic survey has no measurable effect on species richness or abundance of a coral reef associated fish community  

Science Journals Connector (OSTI)

Abstract Underwater visual census was used to determine the effect of a three dimensional seismic survey on the shallow water coral reef slope associated fish community at Scott Reef. A census of the fish community was conducted on six locations at Scott Reef both before and after the survey. The census included small site attached demersal species belonging to the family Pomacentridae and larger roving demersal species belonging to the non-Pomacentridae families. These data were combined with a decade of historical data to assess the impact of the seismic survey. Taking into account spatial, temporal, spatio-temporal and observer variability, modelling showed no significant effect of the seismic survey on the overall abundance or species richness of Pomacentridae or non-Pomacentridae. The six most abundant species were also analysed individually. In all cases no detectable effect of the seismic survey was found on the abundance of these fish species at Scott Reef.

Ian Miller; Edward Cripps

2013-01-01T23:59:59.000Z

2

Three-dimensional seismic imaging of a dymanic Earth  

Science Journals Connector (OSTI)

...M. T. Thompson Three-dimensional seismic imaging of a dymanic Earth Lidia Lonergan...UK ( nwhite@esc.cam.ac.uk ) Seismic imaging is the most important tool used...and application of three-dimensional seismic reflection technology. Routinely used...

1999-01-01T23:59:59.000Z

3

Three dimensional seismic imaging of the Rye Patch geothermal...  

Open Energy Info (EERE)

seismic imaging of the Rye Patch geothermal reservoir Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Three dimensional seismic imaging of the Rye Patch...

4

Three-Dimensional Seismic Imaging Of The Rye Patch Geothermal Reservoir |  

Open Energy Info (EERE)

Three-Dimensional Seismic Imaging Of The Rye Patch Geothermal Reservoir Three-Dimensional Seismic Imaging Of The Rye Patch Geothermal Reservoir Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Three-Dimensional Seismic Imaging Of The Rye Patch Geothermal Reservoir Details Activities (3) Areas (1) Regions (0) Abstract: A 3-D surface seismic survey was conducted to explore the structure of the Rye Patch geothermal reservoir (Nevada), to determine if modern seismic techniques could be successfully applied in geothermal environments. Furthermore, it was intended to map the structural features which may control geothermal production in the reservoir. The seismic survey covered an area of 3.03 square miles and was designed with 12 north-south receiver lines and 25 east-west source lines. The receiver group interval was 100 feet and the receiver line spacing was 800 feet. The

5

Three-Dimensional Seismic Imaging of the Ryepatch Geothermal Reservoir  

E-Print Network [OSTI]

hydrothermal al- teration would combine to reduce the effectiveness of standard 3-D seismic processing.

Feighner, Mark A.

2010-01-01T23:59:59.000Z

6

Three-dimensional seismic stratigraphic study of downdip Yegua sandstones, Edna Field, Jackson County, Texas  

E-Print Network [OSTI]

This study reports an investigation of the structure and stratigraphy of the downdip Yegua sandstones at Edna Field, Jackson County, South Texas. The study is based on 22.9 square miles of three dimensional (3-D) seismic data, well-logs from 15...

Trikania, Andra

2012-06-07T23:59:59.000Z

7

Three-dimensional seismic tomography with tetrahedra element on isoparametric mapping  

Science Journals Connector (OSTI)

The author has developed a method of three-dimensional seismic tomography on concrete structures. This method is based on ray-trace and identification technique, and the distribution of slowness or energy dissipation is identified based on simultaneously iterative reconstruction technique (SIRT) or the other kind of statistical identification technique. This kind of technique was originally developed for investigation of underground that is called geotomography, however, this technique was difficult to apply to concrete structures because the structures generally have irregular shape. A hexahedral element was implemented by the author to overcome this difficulty based on the idea of isoparametric mapping of hexahedral element on finite element analysis, however, it is still difficult to apply the method to the structures that have highly irregular shape. In this respect, an implementation of tetrahedral element is proposed for the three-dimensional seismic tomography on concrete structures to solve the difficulty in this paper. This implementation is based on the idea of isoparametric mapping as well as the case of hexahedral element and it enables to apply the method to structures of complex shape that is insufficient to represent by hexahedral elements. The validity of the proposed method is checked by some numerical example.

Yoshikazu Kobayashi

2012-01-01T23:59:59.000Z

8

Modeling Three-Dimensional Upper Mantle Seismic Anisotropy with Higher Mode Surface Waves  

E-Print Network [OSTI]

Seismic Anisotropy . . . . . . . . . . . . . . . . . . . .Seismic Wave Propagation in a Weakly Anisotropicof seismic anisotropy . . . . . . . . . . . . . . . .

Yuan, Kaiqing

2014-01-01T23:59:59.000Z

9

Bulletin of the Seismological Society of America, 90, 6B, pp. S65S76, December 2000 The SCEC Southern California Reference Three-Dimensional Seismic  

E-Print Network [OSTI]

Southern California Reference Three-Dimensional Seismic Velocity Model Version 2 by Harold Magistrale-dimensional (3D) seismic velocity model of southern California developed by the Southern California Earthquake mesh of seismic velocity and density values. This parameterization is convenient to store, transfer

Clayton, Robert W.

10

Seismic Modelling of the Earth's Large-Scale Three-Dimensional Structure  

Science Journals Connector (OSTI)

4 July 1989 research-article Seismic Modelling of the Earth's Large-Scale...article we describe several methods of seismic inversion and intercompare the resulting...is that the magnitude of the observed seismic anomalies is of the order expected in...

1989-01-01T23:59:59.000Z

11

Three-dimensional seismic stratigraphic study of Minnelusa Formation, Powder River basin, Campbell County, Wyoming  

E-Print Network [OSTI]

and synthetic seismic traces indicate that the anomalous reflection event probably results from the high impedance contrast between the low-velocity oil-producing interval and the surrounding high-velocity zones. Other occurrences of similar anomalies may... Stratigraphy. Eagle Rock Field . MATERIALS AND METHODS Seismic Data Well Data Synthetic Seismic Traces Interpretation Procedure Upper Minnelusa Formation Interpretation Methods RESULTS Anomalous Minnelusa Formation Reflection Event Importance...

Walters, Donna Lynn

2012-06-07T23:59:59.000Z

12

Leasing and Exploration * Seismic geophysical surveys  

E-Print Network [OSTI]

#12;Leasing and Exploration * Seismic geophysical surveys * Exploratory drilling using various.S. citizens engaged in a specific activity (other than commercial fishing) in a specified geographical region

13

Three-dimensional geometrical ray theory and modelling of transmitted seismic energy of data from the Nevada Test Site  

Science Journals Connector (OSTI)

......seismic energy of data from the Nevada Test Site How-Wei Chen Institute of Seismology...from the Rainier Mesa of the Nevada Test Site produced a good fit to the transmitted...recorded at Rainier Mesa at the Nevada Test Site (Ward 1982) was obtained......

How-Wei Chen

1998-05-01T23:59:59.000Z

14

Three-dimensional Magnetic Restructuring in Two Homologous Solar Flares in the Seismically Active NOAA AR 11283  

E-Print Network [OSTI]

We carry out a comprehensive investigation comparing the three-dimensional magnetic field restructuring, flare energy release, and the helioseismic response, of two homologous flares, the 2011 September 6 X2.1 (FL1) and September 7 X1.8 (FL2) flares in NOAA AR 11283. In our analysis, (1) a twisted flux rope (FR) collapses onto the surface at a speed of 1.5 km/s after a partial eruption in FL1. The FR then gradually grows to reach a higher altitude and collapses again at 3 km/s after a fuller eruption in FL2. Also, FL2 shows a larger decrease of the flux-weighted centroid separation of opposite magnetic polarities and a greater change of the horizontal field on the surface. These imply a more violent coronal implosion with corresponding more intense surface signatures in FL2. (2) The FR is inclined northward, and together with the ambient fields, it undergoes a southward turning after both events. This agrees with the asymmetric decay of the penumbra observed in the peripheral regions. (3) The amounts of free ...

Liu, Chang; Lee, Jeongwoo; Wiegelmann, Thomas; Jiang, Chaowei; Dennis, Brian R; Su, Yang; Donea, Alina; Wang, Haimin

2014-01-01T23:59:59.000Z

15

Seismic Emissions Surveys | Open Energy Information  

Open Energy Info (EERE)

Emissions Surveys Emissions Surveys Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Seismic Emissions Surveys Abstract With recent improvements in acquiring, processing and interpreting data, seismic ground noise provides a valuable tool for geothermal exploration. A time domain beam steering array processing technique is employed. This process eliminates the occurrence of false anomalies caused by local geologic amplification effects. Surveys of this type are used to located naturally fractured reservoirs. Results form Dixie Valley and Desert Peak, Nevada correlate well with the location of productive wells or known geology. Authors Katz and Lewis J. Published Journal Geothermal Resources Council Transactions, 1984 DOI Not Provided Check for DOI availability: http://crossref.org

16

Exposure to seismic survey alters blue whale acoustic communication  

Science Journals Connector (OSTI)

...research-article Animal behaviour 1001 14 Exposure to seismic survey alters blue whale acoustic communication...their natural functions. Sounds from seismic surveys are intense and have peak frequency...changed their vocal behaviour during a seismic survey that deployed a low-medium power...

2010-01-01T23:59:59.000Z

17

The middle Jacobian of three-dimensional varieties  

Science Journals Connector (OSTI)

The paper gives a survey of the most recent transcendental methods in the theory of three-dimensional algebraic manifolds.

A. N. Tyurin

1980-06-01T23:59:59.000Z

18

Three-dimensional  

Office of Scientific and Technical Information (OSTI)

Three-dimensional Three-dimensional gravity modelling and focusing inversion using rectangular meshes Michael Commer Lawrence Berkeley National Laboratories Earth Sciences Division 1 Cyclotron Road, MS 90-1116 Berkeley, CA 94720 USA (March 17, 2011) ABSTRACT Rectangular grid cells are commonly used for the geophysical modeling of gravity anomalies, owing to their flexibility in constructing complex models. The straightforward handling of cubic cells in gravity inversion algorithms allows for a flexible imposition of model regulariza- tion constraints, which are generally essential in the inversion of static potential field data. The first part of this paper provides a review of commonly used expressions for calculating the gravity of a right polygonal prism, both for gravity and gradiometry, where the formulas of Plouff and Forsberg are adapted. The formulas can be cast into general

19

Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et  

Open Energy Info (EERE)

Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Al., 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Refraction Survey At Central Nevada Seismic Zone Region (Heimgartner, Et Al., 2005) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Refraction Survey Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Michelle Heimgartner, James B. Scott, Weston Thelen, Christopher R. Lopez, John N. Louie (2005) Variable Crustal Thickness In The Western Great Basin- A Compilation Of Old And New Refraction Data Retrieved from "http://en.openei.org/w/index.php?title=Refraction_Survey_At_Central_Nevada_Seismic_Zone_Region_(Heimgartner,_Et_Al.,_2005)&oldid=401382

20

Three-dimensional ultrasound scanning  

Science Journals Connector (OSTI)

...Three-dimensional ultrasound imaging. In Handbook of medical imaging. Physics and psychophysics, vol. 1 (eds Bautel...Three-dimensional ultrasound imaging. In Handbook of medical imaging. Physics and psychophysics, vol. 1 (eds Beutel...

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three Dimensional Anodes and Architectures  

Broader source: Energy.gov (indexed) [DOE]

for three- dimensional electrodes including synthesis, cell design and cycling optimization (on going). Milestones ApproachStrategy APPROACH: Develop a detailed understanding...

22

Seismic refraction survey of the ANS preferred site  

SciTech Connect (OSTI)

Between September 19, 1991 and October 8, 1991 personnel from Martin Marietta Energy Systems, Inc. (Energy Systems), Automated Sciences Group, Inc., and Marrich, Inc. performed a seismic refraction survey at the Advanced Neutron Source (ANS) preferred site. The purpose of this survey was to provide estimates of top-of-rock topography, based on seismic velocities, and to delineate variations in rock and soil velocities. Forty-four seismic refraction spreads were shot to determine top-of-rock depths at 42 locations. Nine of the seismic spreads were shot with long offsets to provide 216 top-of-rock depths for 4 seismic refraction profiles. The refraction spread locations were based on the grid for the ANS Phase I drilling program. Interpretation of the seismic refraction data supports the assumption that the top-of-rock surface generally follows the local topography. The shallow top-of-rock interface interpreted from the seismic refraction data is also supported by limited drill information at the site. Some zones of anomalous data are present that could be the result of locally variable weathering, a localized variation in shale content, or depth to top-of-rock greater than the site norm.

Davis, R.K. (Automated Sciences Group, Inc., Oak Ridge, TN (United States)); Hopkins, R.A. (Marrich, Inc., Knoxville, TN (United States)); Doll, W.E. (Oak Ridge National Lab., TN (United States))

1992-02-01T23:59:59.000Z

23

Seismic Refraction Survey in the Western Approaches to the English Channel: Preliminary Results [and Discussion  

Science Journals Connector (OSTI)

24 July 1975 research-article Seismic Refraction Survey in the Western Approaches...Avedik A. J. Smith R. A. Dardel A seismic refraction survey of the Western Approaches...hydrophones positioned on the sea floor. The seismic signal was transmitted by radio to a shipboard...

1975-01-01T23:59:59.000Z

24

A 3D-3C Reflection Seismic Survey and Data Integration to Identify...  

Office of Environmental Management (EM)

to Identify the Seismic Response of Fractures and Permeable Zones Over a Known Geothermal Resource at Soda Lake, Churchhill Co., NV A 3D-3C Reflection Seismic Survey and Data...

25

Widespread 3D seismic survey covers mature field in Gabon  

SciTech Connect (OSTI)

The exploration potential of the Port Gentil region, characterized by some of the earliest petroleum discoveries in Gabon, continues to be of important interest today. Available seismic data are of an older vintage (1974--82), recorded with low common mid-point (CMP) fold. They are critically void of coverage through the transition zone. The geology is highly complex, characterized by salt structures and strong tectonic activity. An intensive joint exploration and reservoir definition campaign is crucial to full evaluation of this area. This article describes the 3D survey conducted during 1992 and early 1993 over a mature oil field in an around Port Gentil and incorporating elements of land, transition zone, and shallow marine data acquisition -- the 3D Mandji program.

Riley, D.; Fleming, M. (Western Geophysical, Houston, TX (United States)); Delvaux, J. (Elf Gabon, Port Gentil (Gabon))

1993-12-06T23:59:59.000Z

26

Geodetic Survey At Central Nevada Seismic Zone Region (Laney, 2005) | Open  

Open Energy Info (EERE)

Geodetic Survey At Central Nevada Seismic Zone Region (Laney, 2005) Geodetic Survey At Central Nevada Seismic Zone Region (Laney, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geodetic Survey At Central Nevada Seismic Zone Region (Laney, 2005) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Geodetic Survey Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown Notes Targeting of Potential Geothermal Resources in the Great Basin from Regional to Basin-Scale Relationships Between Geodetic Strain and Geological Structures, Geoffrey Blewitt. The objectives of this project are to assess the use of inter-seismic crustal strain rates derived from GPS-stations as an exploration tool for non-magmatic high-temperature

27

Three-dimensional Q (super -1) model of the Coso Hot Springs known  

Open Energy Info (EERE)

Q (super -1) model of the Coso Hot Springs known Q (super -1) model of the Coso Hot Springs known geothermal resource area (in Coso geothermal area) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Three-dimensional Q (super -1) model of the Coso Hot Springs known geothermal resource area (in Coso geothermal area) Details Activities (3) Areas (1) Regions (0) Abstract: Observations of teleseismic P waves above geothermal systems exhibit travel time delays and anomalously high seismic attenuation, which is extremely useful in estimating the thermal regime and the potential of the system. A regional telemetered network of sixteen stations was operated by the U.S. Geological Survey in the Coso Hot Springs Known Geothermal Resources Area (KGRA) for such studies from September 1975 to October 1976.

28

Three-dimensional fluvial-deltaic sequence stratigraphy Pliocene-Recent Muda Formation, Belida Field, West Natuna Basin, Indonesia  

E-Print Network [OSTI]

The Pliocene-Recent Muda formation is essentially undeformed in the West Natuna Basin, and excellent resolution of this interval on three-dimensional seismic data in Belida Field allows detailed interpretation of component fluvial-deltaic systems...

Darmadi, Yan

2007-04-25T23:59:59.000Z

29

Front roughening in three-dimensional imbibition  

Science Journals Connector (OSTI)

We investigate the structure and dynamics of the interface between two immiscible liquids in a three-dimensional disordered porous medium. We apply a phase-field model that includes explicitly disorder and di...

M. Dubé; C. Daneault; V. Vuorinen; M. Alava; M. Rost

2007-03-01T23:59:59.000Z

30

Nanowired three-dimensional cardiac patches  

E-Print Network [OSTI]

Engineered cardiac patches for treating damaged heart tissues after a heart attack are normally produced by seeding heart cells within three-dimensional porous biomaterial scaffolds1, 2, 3. These biomaterials, which are ...

Dvir, Tal

31

A Survey Of Seismic Activity Near Wairakei Geothermal Field, New Zealand |  

Open Energy Info (EERE)

Of Seismic Activity Near Wairakei Geothermal Field, New Zealand Of Seismic Activity Near Wairakei Geothermal Field, New Zealand Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Survey Of Seismic Activity Near Wairakei Geothermal Field, New Zealand Details Activities (0) Areas (0) Regions (0) Abstract: A five-week survey showed that seismic activity within 20 km of Wairakei Geothermal Field took place mainly at shallow depths (< 2 km), in or close to the Taupo Fault Belt, and occurred in swarms. Twenty-eight earthquakes, with magnitudes (M) between -1.3 and +2.8, were located; 43 other earthquakes, with M < 0.2, were recorded but could not be located. The distribution of located earthquakes did not correlate with known areas of surface geothermal activity. No located earthquake occurred beneath the

32

A 3D-3C Reflection Seismic Survey and Data Integration to Identify the  

Open Energy Info (EERE)

D-3C Reflection Seismic Survey and Data Integration to Identify the D-3C Reflection Seismic Survey and Data Integration to Identify the Seismic Response of Fractures and Permeable Zones Over a Known Geothermal Resource at Soda Lake, Churchill Co., NV Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title A 3D-3C Reflection Seismic Survey and Data Integration to Identify the Seismic Response of Fractures and Permeable Zones Over a Known Geothermal Resource at Soda Lake, Churchill Co., NV Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description The Soda Lake geothermal field is an ideal setting to test the applicability of the 3D-3C reflection seismic method because: it is a producing field with a great deal of geologic and drilling data already available; it is in an alluvial valley where the subsurface structures that carry the geothermal fluids have no surface manifestations; and, there are downhole geophysical logs of fractures and permeable zones that can be used to ground-truth the new data.

33

Geodetic Survey At Central Nevada Seismic Zone Region (Blewitt, Et Al.,  

Open Energy Info (EERE)

Blewitt, Et Al., Blewitt, Et Al., 2003) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geodetic Survey At Central Nevada Seismic Zone Region (Blewitt, Et Al., 2003) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Geodetic Survey Activity Date Usefulness useful regional reconnaissance DOE-funding Unknown References Geoffrey Blewittl, Mark F. Coolbaugh, Don Sawatzky, William Holt, James Davis, Richard A. Bennett (2003) Targeting Of Potential Geothermal Resources In The Great Basin From Regional To Basin-Scale Relationship Between Geodetic Strain And Geological Structures Retrieved from "http://en.openei.org/w/index.php?title=Geodetic_Survey_At_Central_Nevada_Seismic_Zone_Region_(Blewitt,_Et_Al.,_2003)&oldid=401367

34

Sandia National Laboratories: Three-Dimensional Graphene Architectures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ClimateECResearch & CapabilitiesCapabilitiesThree-Dimensional Graphene Architectures Three-Dimensional Graphene Architectures Jerry Simmons Is One of Three Researchers Named as...

35

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Broader source: Energy.gov (indexed) [DOE]

Three-Dimensional Composite Nanostructures for Lean NOx Emission Control Three-Dimensional Composite Nanostructures for Lean NOx Emission Control 2010 DOE Vehicle Technologies and...

36

Lina Jansen Human Eye Movements in Three Dimensional  

E-Print Network [OSTI]

Lina Jansen Human Eye Movements in Three Dimensional Natural Scenes PICS Publications of Cognitive Science #12;Bachelor's Thesis Human eye movements in three dimensional natural scenes Lina Jansen

Kallenrode, May-Britt

37

Three-dimensional Modeling of Fracture Clusters in Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Three-dimensional Modeling of Fracture Clusters in Geothermal Reservoirs; 2010 Geothermal Technology Program Peer Review Report Three-dimensional Modeling of Fracture Clusters in...

38

Direct-Current Resistivity Survey At Central Nevada Seismic Zone Region  

Open Energy Info (EERE)

Survey At Central Nevada Survey At Central Nevada Seismic Zone Region (Pritchett, 2004) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Direct-Current Resistivity Survey Activity Date Usefulness useful DOE-funding Unknown Notes NOTE: These are theoretical/computer simulation tests of various methods on eight hypothetical 'model' basing-and-range geothermal systems. "The 300-meter heat flow holes are essentially useless for finding the "hidden" reservoirs. Clearly, the best results are obtained from the SP and MT surveys, with DC resistivity a close third. It is concluded that the best way to find "hidden" basin and range geothermal resources of this general type is to carry out simultaneous SP and low-frequency MT surveys, and then

39

Real time three dimensional sensing system  

DOE Patents [OSTI]

The invention is a three dimensional sensing system which utilizes two flexibly located cameras for receiving and recording visual information with respect to a sensed object illuminated by a series of light planes. Each pixel of each image is converted to a digital word and the words are grouped into stripes, each stripe comprising contiguous pixels. One pixel of each stripe in one image is selected and an epi-polar line of that point is drawn in the other image. The three dimensional coordinate of each selected point is determined by determining the point on said epi-polar line which also lies on a stripe in the second image and which is closest to a known light plane. 7 figs.

Gordon, S.J.

1996-12-31T23:59:59.000Z

40

Real time three dimensional sensing system  

DOE Patents [OSTI]

The invention is a three dimensional sensing system which utilizes two flexibly located cameras for receiving and recording visual information with respect to a sensed object illuminated by a series of light planes. Each pixel of each image is converted to a digital word and the words are grouped into stripes, each stripe comprising contiguous pixels. One pixel of each stripe in one image is selected and an epi-polar line of that point is drawn in the other image. The three dimensional coordinate of each selected point is determined by determining the point on said epi-polar line which also lies on a stripe in the second image and which is closest to a known light plane.

Gordon, Steven J. (Boston, MA)

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-dimensional display of document set  

DOE Patents [OSTI]

A method for spatializing text content for enhanced visual browsing and analysis. The invention is applied to large text document corpora such as digital libraries, regulations and procedures, archived reports, and the like. The text content from these sources may be transformed to a spatial representation that preserves informational characteristics from the documents. The three-dimensional representation may then be visually browsed and analyzed in ways that avoid language processing and that reduce the analysts' effort.

Lantrip, David B. (Oxnard, CA) [Oxnard, CA; Pennock, Kelly A. (Richland, WA) [Richland, WA; Pottier, Marc C. (Richland, WA) [Richland, WA; Schur, Anne (Richland, WA) [Richland, WA; Thomas, James J. (Richland, WA) [Richland, WA; Wise, James A. (Richland, WA) [Richland, WA

2001-10-02T23:59:59.000Z

42

Three-Dimensional Dispaly Of Document Set  

DOE Patents [OSTI]

A method for spatializing text content for enhanced visual browsing and analysis. The invention is applied to large text document corpora such as digital libraries, regulations and procedures, archived reports, and the like. The text content from these sources may be transformed to a spatial representation that preserves informational characteristics from the documents. The three-dimensional representation may then be visually browsed and analyzed in ways that avoid language processing and that reduce the analysts' effort.

Lantrip, David B. (Oxnard, CA); Pennock, Kelly A. (Richland, WA); Pottier, Marc C. (Richland, WA); Schur, Anne (Richland, WA); Thomas, James J. (Richland, WA); Wise, James A. (Richland, WA)

2003-06-24T23:59:59.000Z

43

Three-dimensional display of document set  

DOE Patents [OSTI]

A method for spatializing text content for enhanced visual browsing and analysis. The invention is applied to large text document corpora such as digital libraries, regulations and procedures, archived reports, and the like. The text content from these sources may be transformed to a spatial representation that preserves informational characteristics from the documents. The three-dimensional representation may then be visually browsed and analyzed in ways that avoid language processing and that reduce the analysts' effort.

Lantrip, David B. (Oxnard, CA); Pennock, Kelly A. (Richland, WA); Pottier, Marc C. (Richland, WA); Schur, Anne (Richland, WA); Thomas, James J. (Richland, WA); Wise, James A. (Richland, WA); York, Jeremy (Bothell, WA)

2009-06-30T23:59:59.000Z

44

Three-dimensional display of document set  

DOE Patents [OSTI]

A method for spatializing text content for enhanced visual browsing and analysis. The invention is applied to large text document corpora such as digital libraries, regulations and procedures, archived reports, and the like. The text content from these sources may e transformed to a spatial representation that preserves informational characteristics from the documents. The three-dimensional representation may then be visually browsed and analyzed in ways that avoid language processing and that reduce the analysts' effort.

Lantrip, David B. (Oxnard, CA); Pennock, Kelly A. (Richland, WA); Pottier, Marc C. (Richland, WA); Schur, Anne (Richland, WA); Thomas, James J. (Richland, WA); Wise, James A. (Richland, WA)

2006-09-26T23:59:59.000Z

45

Electrode With Porous Three-Dimensional Support  

SciTech Connect (OSTI)

Electrode including a paste containing particles of electrochemically active material and a conductive support consisting of a three-dimensional porous material comprising strands delimiting contiguous pores communicating via passages, characterized in that the average width L in .mu.m of said passages is related to the average diameter .O slashed. in .mu.m of said particles by the following equation, in which W and Y are dimensionless coefficients: wherein W=0.16 Y=1.69 X=202.4 .mu.m and Z=80 .mu.m

Bernard, Patrick (Massy, FR); Dauchier, Jean-Michel (Martignas, FR); Simonneau, Olivier (Dourdan, FR)

1999-07-27T23:59:59.000Z

46

Two component-three dimensional catalysis  

DOE Patents [OSTI]

This invention relates to catalytic reactor membranes having a gas-impermeable membrane for transport of oxygen anions. The membrane has an oxidation surface and a reduction surface. The membrane is coated on its oxidation surface with an adherent catalyst layer and is optionally coated on its reduction surface with a catalyst that promotes reduction of an oxygen-containing species (e.g., O.sub.2, NO.sub.2, SO.sub.2, etc.) to generate oxygen anions on the membrane. The reactor has an oxidation zone and a reduction zone separated by the membrane. A component of an oxygen containing gas in the reduction zone is reduced at the membrane and a reduced species in a reactant gas in the oxidation zone of the reactor is oxidized. The reactor optionally contains a three-dimensional catalyst in the oxidation zone. The adherent catalyst layer and the three-dimensional catalyst are selected to promote a desired oxidation reaction, particularly a partial oxidation of a hydrocarbon.

Schwartz, Michael (Boulder, CO); White, James H. (Boulder, CO); Sammells, Anthony F. (Boulder, CO)

2002-01-01T23:59:59.000Z

47

Interface delocalization in the three-dimensional Ising model  

Science Journals Connector (OSTI)

The interface delocalization in the three-dimensional Ising model is studied by real-space renormalization...

G. Bilalbegovi?

1988-03-01T23:59:59.000Z

48

Steady, three-dimensional, internally heated convection  

SciTech Connect (OSTI)

Numerical calculations have been carried out of steady, symmetric, three-dimensional modes of convection in internally heated, infinite Prandtl number, Boussinesq fluids at a Rayleigh number of 1.4[times]10[sup 4] in a spherical shell with inner/outer radius of 0.55 and in a 3[times]3[times]1 rectangular box. Multiple patterns of convection occur in both geometries. In the Cartesian geometry the patterns are dominated by cylindrical cold downflows and a broad hot upwelling. In the spherical geometry the patterns consist of cylindrical cold downwellings centered either at the vertices of a tetrahedron or the centers of the faces of a cube. The cold downflow cylinders are immersed in a background of upwelling within which there are cylindrical hot concentrations (plumes) and hot halos around the downflows. The forced hot upflow return plumes of internally heated spherical convection are fundamentally different from the buoyancy-driven plumes of heated from below convection.

Schubert, G. (Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90024 (United States)); Glatzmaier, G.A.; Travis, B. (Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States))

1993-08-01T23:59:59.000Z

49

Three dimensional fabric evolution of sheared sand  

SciTech Connect (OSTI)

Granular particles undergo translation and rolling when they are sheared. This paper presents a three-dimensional (3D) experimental assessment of fabric evolution of sheared sand at the particle level. F-75 Ottawa sand specimen was tested under an axisymmetric triaxial loading condition. It measured 9.5 mm in diameter and 20 mm in height. The quantitative evaluation was conducted by analyzing 3D high-resolution x-ray synchrotron micro-tomography images of the specimen at eight axial strain levels. The analyses included visualization of particle translation and rotation, and quantification of fabric orientation as shearing continued. Representative individual particles were successfully tracked and visualized to assess the mode of interaction between them. This paper discusses fabric evolution and compares the evolution of particles within and outside the shear band as shearing continues. Changes in particle orientation distributions are presented using fabric histograms and fabric tensor.

Hasan, Alsidqi; Alshibli, Khalid (UWA)

2012-10-24T23:59:59.000Z

50

U.S. Maximum Number of Active Crews Engaged in Seismic Surveying (Number of  

Gasoline and Diesel Fuel Update (EIA)

Maximum Number of Active Crews Engaged in Seismic Surveying (Number of Elements) Maximum Number of Active Crews Engaged in Seismic Surveying (Number of Elements) U.S. Maximum Number of Active Crews Engaged in Seismic Surveying (Number of Elements) Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2000 0 0 62 63 59 63 58 61 59 63 62 65 2001 61 61 63 65 64 60 58 56 54 58 59 58 2002 54 57 54 50 51 50 52 50 56 57 50 43 2003 40 41 41 40 38 39 41 43 39 39 38 42 2004 43 45 45 45 44 49 48 49 48 48 49 50 2005 52 53 51 50 55 57 54 55 56 57 57 58 2006 55 57 59 58 58 57 66 62 63 64 65 64 2007 63 63 68 71 70 69 69 71 73 77 79 75 2008 76 77 75 72 73 73 72 72 NA 77 72 73 2009 75 76 72 70 65 60 61 60 60 63 62 63 2010 64 65 63 66 67 67 67 65 64 62 62 62

51

Three dimensional characterization and archiving system  

SciTech Connect (OSTI)

The Three Dimensional Characterization and Archiving System (3D-ICAS) is being developed as a remote system to perform rapid in situ analysis of hazardous organics and radionuclide contamination on structural materials. Coleman Research and its subcontractors, Thermedics Detection, Inc. (TD) and the University of Idaho (UI) are in the second phase of a three phase program to develop 3D-ICAS to support Decontamination and Decommissioning (D&D) operations. Accurate physical characterization of surfaces and the radioactive and organic is a critical D&D task. Surface characterization includes identification of potentially dangerous inorganic materials, such as asbestos and transite. Real-time remotely operable characterization instrumentation will significantly advance the analysis capabilities beyond those currently employed. Chemical analysis is a primary area where the characterization process will be improved. Chemical analysis plays a vital role throughout the process of decontamination. Before clean-up operations can begin the site must be characterized with respect to the type and concentration of contaminants, and detailed site mapping must clarify areas of both high and low risk. During remediation activities chemical analysis provides a means to measure progress and to adjust clean-up strategy. Once the clean-up process has been completed the results of chemical analysis will verify that the site is in compliance with federal and local regulations.

Sebastian, R.L.; Clark, R.; Gallman, P. [and others

1995-12-01T23:59:59.000Z

52

Three dimensional characterization and archiving system  

SciTech Connect (OSTI)

The Three Dimensional Characterization and Archiving System (3D-ICAS) is being developed as a remote system to perform rapid in situ analysis of hazardous organics and radionuclide contamination on structural materials. Coleman Research and its subcontractors, Thermedics Detection, Inc. (TD) and the University of Idaho (UI) are in the second phase of a three phase program to develop 3D-ICAS to support Decontamination and Decommissioning (D and D) operations. Accurate physical characterization of surfaces and the radioactive and organic is a critical D and D task. Surface characterization includes identification of potentially dangerous inorganic materials, such as asbestos and transite. Real-time remotely operable characterization instrumentation will significantly advance the analysis capabilities beyond those currently employed. Chemical analysis is a primary area where the characterization process will be improved. The 3D-ICAS system robotically conveys a multisensor probe near the surfaces to be inspected. The sensor position and orientation are monitored and controlled using coherent laser radar (CLR) tracking. The CLR also provides 3D facility maps which establish a 3D world view within which the robotic sensor system can operate.

Sebastian, R.L.; Clark, R.; Gallman, P. [and others

1996-04-01T23:59:59.000Z

53

Three-dimensional charge coupled device  

DOE Patents [OSTI]

A monolithic three dimensional charged coupled device (3D-CCD) which utilizes the entire bulk of the semiconductor for charge generation, storage, and transfer. The 3D-CCD provides a vast improvement of current CCD architectures that use only the surface of the semiconductor substrate. The 3D-CCD is capable of developing a strong E-field throughout the depth of the semiconductor by using deep (buried) parallel (bulk) electrodes in the substrate material. Using backside illumination, the 3D-CCD architecture enables a single device to image photon energies from the visible, to the ultra-violet and soft x-ray, and out to higher energy x-rays of 30 keV and beyond. The buried or bulk electrodes are electrically connected to the surface electrodes, and an E-field parallel to the surface is established with the pixel in which the bulk electrodes are located. This E-field attracts charge to the bulk electrodes independent of depth and confines it within the pixel in which it is generated. Charge diffusion is greatly reduced because the E-field is strong due to the proximity of the bulk electrodes.

Conder, Alan D. (Tracy, CA); Young, Bruce K. F. (Livermore, CA)

1999-01-01T23:59:59.000Z

54

Three-dimensional printing of tissue phantoms for biophotonic imaging  

Science Journals Connector (OSTI)

We have investigated the potential of tissue phantoms fabricated with thermosoftening- and photopolymerization-based three-dimensional (3D) printers for use in evaluation of...

Wang, Jianting; Coburn, James; Liang, Chia-Pin; Woolsey, Nicholas; Ramella-Roman, Jessica C; Chen, Yu; Pfefer, T Joshua

2014-01-01T23:59:59.000Z

55

Three-dimensional Modeling of Fracture Clusters in Geeothermal Reservoirs  

Broader source: Energy.gov [DOE]

Three-dimensional Modeling of Fracture Clusters in Geeothermal Reservoirs presentation at the April 2013 peer review meeting held in Denver, Colorado.

56

Three-dimensional Modeling of Fracture Clusters in Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

1 4.6.1 Three-dimensional Modeling of Fracture Clusters in Geothermal Reservoirs Presentation Number: 028 Investigator: Ghassemi, Ahmad (Texas A&M University) Objectives: To...

57

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

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

Emission Control Catalysts Three-Dimensional Composite Nanostructures for Lean NOx Emission Control Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts...

58

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Broader source: Energy.gov (indexed) [DOE]

Nanowire Lean NOx Emission Control Catalysts Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts Three-Dimensional Composite Nanostructures for Lean...

59

Three-Dimensional Thermal Tomography Advances Cancer Treatment...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Three-Dimensional Thermal Tomography Advances Cancer Treatment Technology available for licensing: A 3D technique to detect early skin changes due to radiation treatment in breast...

60

Three-dimensional Chemical Imaging of Embedded Nanoparticles...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

dimensional Chemical Imaging of Embedded Nanoparticles using Atom Probe Tomography. Three-dimensional Chemical Imaging of Embedded Nanoparticles using Atom Probe Tomography....

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Seismic Survey Report for Central Nevada Test Area, Subsurface, Correction Action Unit 443, Revision 1  

SciTech Connect (OSTI)

The seismic survey was successful in imaging the water table and underlying structures at the site. The configuration of the water table reflector confirms the general southeast horizontal flow direction in the alluvial aquifer. Offsets in the water table reflector, both at known faults that reach the surface and at subsurface faults not previously recognized, indicate that both extension and blast-related faults are barriers to lateral groundwater flow. The results from this study have been used to optimally locate two new wells designed to monitor head levels and possible contaminant migration in the alluvial aquifer at CTNA.

None

2008-12-19T23:59:59.000Z

62

Three-dimensional anatomy of a geothermal field, Coso, Southeast-Central  

Open Energy Info (EERE)

anatomy of a geothermal field, Coso, Southeast-Central anatomy of a geothermal field, Coso, Southeast-Central California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Book: Three-dimensional anatomy of a geothermal field, Coso, Southeast-Central California Details Activities (1) Areas (1) Regions (0) Abstract: This paper reviews geophysical and seismological imaging in the Coso geothermal field, located in southeast-central California. The Coso geothermal production area covers approximately 6X10 km 2 . Although regional seismicity is addressed, as it sheds light on the magma, or heat, sources in the field, the primary focus of this paper is on the main production area. Three-dimensional inversions for P- and S- wave velocity variations, distribution of attenuation, and anisotropy are presented side-by-side so that anomalies can be compared spatially in a direct

63

Energy Distribution of Nanoflares in Three-Dimensional Simulations of  

E-Print Network [OSTI]

Energy Distribution of Nanoflares in Three-Dimensional Simulations of Coronal Heating Chung-Sang Ng of the energy distribution of solar flares, there have not been many results based on large-scale three-dimensional direct simulations due to obvious numerical difficulties. We will present energy distributions and other

Ng, Chung-Sang

64

Three-Dimensional Simulation of Spheromak Creation and Tilting Disruption  

Science Journals Connector (OSTI)

Spheromak dynamics is studied for a zero-? plasma by a three-dimensional magneto-hydrodynamics simulation code. The growth rate of the tilting instability is found to be of the order of 10?A (Alfvén transit time) and, more interestingly, once tilt occurs, the spheromak field reconnects three dimensionally with the vertical field, thus leading to a disruptive deformation of the spheromak.

Tetsuya Sato and Takaya Hayashi

1983-01-03T23:59:59.000Z

65

Synthetic Spectrum Methods for Three-Dimensional Supernova Models  

E-Print Network [OSTI]

Current observations stimulate the production of fully three-dimensional explosion models, which in turn motivates three-dimensional spectrum synthesis for supernova atmospheres. We briefly discuss techniques adapted to address the latter problem, and consider some fundamentals of line formation in supernovae without recourse to spherical symmetry. Direct and detailed extensions of the technique are discussed, and future work is outlined.

R. C. Thomas

2003-10-21T23:59:59.000Z

66

Geodynamic and seismic constraints on the thermochemical structure and dynamics of convection in the deep mantle  

Science Journals Connector (OSTI)

...Brodholt and B. J. Wood Geodynamic and seismic constraints on the thermochemical structure...by this viscosity peak. geodynamics|seismic tomography|mantle viscosity|three-dimensional...anomalies|mantle convection| Geodynamic and seismic constraints on the thermochemical structure...

2002-01-01T23:59:59.000Z

67

Submarine Seismic Investigations  

Science Journals Connector (OSTI)

...March 1941 research-article Submarine Seismic Investigations E. C. Bullard T. F. Gaskell The refraction seismic method has been used to investigate the...techniques, and results of a refraction seismic survey of the rock surface underlying...

1941-01-01T23:59:59.000Z

68

A magnetotelluric survey on Manitoulin Island and Bruce Peninsula along GLIMPCE seismic line J: black shales mask the Grenville Front  

Science Journals Connector (OSTI)

......Geological Survey, 1985. Oil shale assessment project drillholes...GLIMPCE seismic line J: black shales mask the Grenville Front M...highly conductive layer of black shales of limited extent, precludes...y believed to be caused by anisotropic effects associated with thick......

M. Mareschal; R. D. Kurtz; M. Chouteau; R. Chakridi

1991-04-01T23:59:59.000Z

69

Three-Dimensional Thermal Tomography Advances Cancer Treatment...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Three-Dimensional Thermal Tomography Advances Cancer Treatment (ANL-IN-07-170) Argonne National Laboratory Contact ANL About This Technology

Change in temperature over time...

70

Subcritical Dissipation in Three-dimensional Superflows , C. Huepe2  

E-Print Network [OSTI]

Subcritical Dissipation in Three-dimensional Superflows C. Nore1 , C. Huepe2 and M. E. Brachet2 1 be responsible for the subcritical (below Mc 2D) dissipation observed by Ra- man et al.7 . We study the effect

Nore, Caroline

71

DNA Origami with Complex Curvatures in Three-Dimensional Space  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

DNA Origami with Complex Curvatures in Three-Dimensional Space Authors: Han, D., Pal, S., Nangreave, J., Deng, Z., Liu, Y., and Yan, H. Title: DNA Origami with Complex Curvatures...

72

Three dimensional thermohydrodynamic analysis of multi-lobed bearings  

E-Print Network [OSTI]

An approach for three dimensional Therinohydrodyiiamic analysis of multi-lobed journal bearings is presented. The generalized Reynolds equation solution yields the Dressure distribution in the axial and circumferential directions. The energy...

Mulchandani, Rajesh R.

1997-01-01T23:59:59.000Z

73

Verification of three-dimensional laser Doppler velocimeter measurements  

Science Journals Connector (OSTI)

An experimental comparison method is proposed for the verification of mean flow and turbulence measurements obtained with a three-dimensional laser Doppler velocimeter system. Such measurements can include large ...

R. D. Mehta

1990-03-01T23:59:59.000Z

74

Three-Dimensional Metal Scaffold Supported Bicontinuous Silicon Battery Anodes  

E-Print Network [OSTI]

Three-Dimensional Metal Scaffold Supported Bicontinuous Silicon Battery Anodes Huigang Zhang Supporting Information ABSTRACT: Silicon-based lithium ion battery anodes are attracting significant during cycling generally leads to anode pulverization unless the silicon is dispersed throughout a matrix

Braun, Paul

75

Spatial reasoning about three-dimensional mechanical assemblies  

E-Print Network [OSTI]

A methodology has been developed to generate selected assembly sequences of three-dimensional, tri-axial mechanical products. A feature-based design system is first introduced and its representation scheme briefly explained. This representation...

Mohammad, Riaz

2012-06-07T23:59:59.000Z

76

Three-Dimensional Lithium-Ion Battery Model (Presentation)  

SciTech Connect (OSTI)

Nonuniform battery physics can cause unexpected performance and life degradations in lithium-ion batteries; a three-dimensional cell performance model was developed by integrating an electrode-scale submodel using a multiscale modeling scheme.

Kim, G. H.; Smith, K.

2008-05-01T23:59:59.000Z

77

Copper wafer bonding in three-dimensional integration  

E-Print Network [OSTI]

Three-dimensional (3D) integration, in which multiple layers of devices are stacked with high density of interconnects between the layers, offers solutions for problems when the critical dimensions in integrated circuits ...

Chen, Kuan-Neng, 1974-

2005-01-01T23:59:59.000Z

78

Design automation and analysis of three-dimensional integrated circuits  

E-Print Network [OSTI]

This dissertation concerns the design of circuits and systems for an emerging technology known as three-dimensional integration. By stacking individual components, dice, or whole wafers using a high-density electromechanical ...

Das, Shamik, 1977-

2004-01-01T23:59:59.000Z

79

Charge Transport within a Three-Dimensional DNA Nanostructure...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Charge Transport within a Three-Dimensional DNA Nanostructure Framework Authors: Lu, N., Pei, H., Ge, Z., Simmons, C.R., Yan, H., and Fan, C. Title: Charge Transport within a...

80

Design and transformation of three dimensional pupils : diffractive and subwavelength  

E-Print Network [OSTI]

Three dimensional pupils are investigated in both diffractive and subwavelength regimes and in various applications to shape the flow of light. In diffractive regime, volume holograms are good candidates for pupils of ...

Gao, Hanhong

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Advances in three-dimensional turbulence measurement capability  

SciTech Connect (OSTI)

Requirements for three-dimensional turbulence velocity measurements for wind turbine purposes have recently led to advances in anemometer accuracy and resolution, particularly for situations when the angle of the wind relative to the anemometer axis is large. New precision calibration data for a complete three-dimensional UVW propeller anemometer are presented. Repeatability of calibration data and comparison with previous calibrations are shown. Special attention is given to the calibration of the crosswind components, V and W. 4 refs., 9 figs.

Connell, J.R.; Morris, V.R.

1988-11-01T23:59:59.000Z

82

Effect of three-dimensionality on compressible mixing  

SciTech Connect (OSTI)

Existing experimental data and hypotheses on the growth rates of compressible and incompressible turbulent shear layers are used to estimate the effect of three-dimensionality in the turbulent mixing enhancement in compressible shear flows that is critically important to the efficiency of scramjet powerplants. The general trend is found to be a decrease in growth rate with increasing three-dimensionality, excepting only the restricted regime, where the growth-rate increase is modest. 9 refs.

Papamoschou, D. (California, University, Irvine (United States))

1992-02-01T23:59:59.000Z

83

Sound-Recording Systems for Measuring Sound Levels During Seismic Surveys  

Science Journals Connector (OSTI)

Two new sound-recording systems were developed as part of a study on the effects of sound from seismic air guns on fish behavior. The systems were used to record ... ) at several depths and distances from the seismic

Jan Tore Øvredal; Bjorn Totland

2012-01-01T23:59:59.000Z

84

Finding Large Aperture Fractures in Geothermal Resource Areas Using A Three-Component Long-Offset Surface Seismic Survey, PSInSAR, and Kinematic Analysis  

Broader source: Energy.gov [DOE]

Fining Large Aperture Fractures in Geothermal Resource Areas Using A Three-Component Long-Offset Surface Seismic Survey, PSInSAR, and Kinematic Analysis presentation at the April 2013 peer review meeting held in Denver, Colorado.

85

Three-dimensional anisotropic yield condition for Green River shale  

SciTech Connect (OSTI)

A three-dimensional, traversely isotropic yield condition is combined with a plane of weakness to describe the initial yield limit for Green River Shale. This theory is compared to experimental results for two different qualities of oil shale, including true three-dimensional tri-axial stress tests. It is interesting to note that a decrease in the anisotropy of the material with increasing mean stress is predicted by the yield condition and is borne out by the experimental results. For large confining stresses, the material ceases to fail preferentially along the plane of weakness.

Smith, M.B. (Amoco Production Research, Tulsa, OK); Cheatham, J.B. Jr.

1980-12-01T23:59:59.000Z

86

Flow shaping using three-dimensional microscale gas discharge  

SciTech Connect (OSTI)

We introduce a flow shaping mechanism using surface compliant microscale gas discharge. A three-dimensional finite element-based multiscale ionized gas flow code is utilized to analyze charge separation, potential distribution, and flow inducement mechanism. For the case of quiescent flow, a horseshoe-shaped plasma generator is introduced. Due to its unusual shape, the three-dimensional electric force excites a pinching effect on the fluid inside selectively powered electrode arc. Such effect is capable of tripping the flow-ejecting fluid normal to the plane of the actuator and thus can be very useful for many applications.

Wang, C.-C.; Roy, Subrata [Department of Mechanical and Aerospace Engineering, Computational Plasma Dynamics Laboratory and Test Facility, University of Florida, Gainesville, Florida 32611-6300 (United States)

2009-08-24T23:59:59.000Z

87

Three-dimensional boron particle loaded thermal neutron detector  

DOE Patents [OSTI]

Three-dimensional boron particle loaded thermal neutron detectors utilize neutron sensitive conversion materials in the form of nano-powders and micro-sized particles, as opposed to thin films, suspensions, paraffin, etc. More specifically, methods to infiltrate, intersperse and embed the neutron nano-powders to form two-dimensional and/or three-dimensional charge sensitive platforms are specified. The use of nano-powders enables conformal contact with the entire charge-collecting structure regardless of its shape or configuration.

Nikolic, Rebecca J.; Conway, Adam M.; Graff, Robert T.; Kuntz, Joshua D.; Reinhardt, Catherine; Voss, Lars F.; Cheung, Chin Li; Heineck, Daniel

2014-09-09T23:59:59.000Z

88

E-Print Network 3.0 - analytical three-dimensional solutions...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

14 On the use of different matrix products to solve finite three-dimensional Ising systems Summary: analytical solutions of finite three-dimensional Ising systems. As an...

89

E-Print Network 3.0 - angular resolution three-dimensional Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: , which may ultimately prove amenable to global three-dimensional numerical simulation. I hate being... of three-dimensional magnetohydrodynamical (MHD) codes and their...

90

E-Print Network 3.0 - anatomic-based three-dimensional planning...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

a three-dimensional shape of an abdominal aortic aneurysm (AAA), from... a limited number of computed tomography (CT) images. The three-dimensional template geometry of...

91

Three-dimensional Bernstein-Greene-Kruskal modes in a  

E-Print Network [OSTI]

Three-dimensional Bernstein- Greene-Kruskal modes in a multi-species plasma: Void solutions-dimensional (3D) Bernstein- Greene-Kruskal (BGK) mode [Ng and Bhattacharjee, Phys. Rev. Lett., 95, 245004 (2005 and the distribution function of the other species depending on energy and angular momentum. Some of these solutions

Ng, Chung-Sang

92

Visualising Internet Traffic Data with Three-Dimensional Spherical Display  

E-Print Network [OSTI]

successful in this respect has proven to give good predictions about structural features of the InternetVisualising Internet Traffic Data with Three-Dimensional Spherical Display Ben Yip1 , Shea Goyette1 of visualising internet traffic data using the underlying spherical nature of the globe. The method uses data

Hong,Seokhee

93

Heart motion measurement with three dimensional sonomicrometry and acceleration sensing  

E-Print Network [OSTI]

Heart motion measurement with three dimensional sonomicrometry and acceleration sensing Tetsuya Horiuchi, E. Erdem Tuna, Ken Masamune, M. Cenk C¸ avus¸oglu Abstract--In robotic assisted beating heart surgery, the goal is to develop a robotic system that can actively cancel heart motion by closely

Cavusoglu, Cenk

94

Three-Dimensional and Multilayer Nanostructures Formed by Nanotransfer  

E-Print Network [OSTI]

ABSTRACT This letter describes the use of nanotransfer printing (nTP) for forming three-dimensional (3D to as nanotransfer printing (nTP),8-11 can be used to build a range of complex 3D structures with feature sizes patterning. Furthermore, the purely additive nature of nTP allows these 2D and 3D printing steps

Rogers, John A.

95

Optically Fabricated Three Dimensional Nanofluidic Mixers for Microfluidic  

E-Print Network [OSTI]

Optically Fabricated Three Dimensional Nanofluidic Mixers for Microfluidic Devices Seokwoo Jeon in the channels of microfluidic systems. Near field scanning optical measurements reveal the optics associated with the fabrication process and the key features that enable its application to the area of microfluidics. Confocal

Rogers, John A.

96

Imaging single atoms in a three-dimensional array  

E-Print Network [OSTI]

LETTERS Imaging single atoms in a three-dimensional array KARL D. NELSON, XIAO LI AND DAVID S atom trapped by light is a promising qubit. It has weak, well-understood interactions with the environment, its internal state can be precisely manipulated1 , interactions that entangle atoms can be varied

Loss, Daniel

97

Field Optimization of Three Dimensional High Voltage C. Trinitis  

E-Print Network [OSTI]

Field Optimization of Three Dimensional High Voltage Equipment C. Trinitis Lehrstuhl f The goal of finding an optimal electric field strength distribution for arbitrary three di­ mensional­ cal optimization algorithm. The package ob­ tained from these three components is then able

Stamatakis, Alexandros

98

Three-Dimensional Core-Shell Superstructures: Mechanically Strong Aerogels  

Science Journals Connector (OSTI)

Nanocasting conformal polymer coatings on preformed three-dimensional assemblies of nanoparticles, macroscopically classified as aerogels, reinforces the interparticle necks and increases the strength of the bulk material dramatically. ... Biocompatible dysprosia aerogels were synthesized from DyCl3·6H2O and were reinforced mechanically with a conformal nano-thin-polyurea coating applied over their skeletal framework. ...

Nicholas Leventis

2007-05-09T23:59:59.000Z

99

Review: semantically interoperable three-dimensional scientific objects  

Science Journals Connector (OSTI)

In recent years, digital content of three-dimensional (3D) scientific objects has become widespread and is made available in a plethora of on-line scientific repositories. A systematic and formal approach becomes necessary to represent the knowledge/information ...

Marios Pitikakis; Manolis Vavalis; Catherine Houstis

2012-02-01T23:59:59.000Z

100

Hydrodynamics of three-dimensional stacked hexatic liquid crystals  

Science Journals Connector (OSTI)

The hydrodynamic equations for three-dimensional stacked hexatic liquid crystals, i.e., for hexatic-B and its tilted analogs, smectic-F and smectic-I, are presented. Differences and similarities to the hydrodynamics of smectic-A and smectic-C are discussed and the role of the additional variable characterizing the bond orientational order is elucidated.

H. Pleiner and H. R. Brand

1984-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Are three-dimensional spider webs defensive adaptations?  

E-Print Network [OSTI]

LETTER Are three-dimensional spider webs defensive adaptations? Todd A. Blackledge1 *, Jonathan A-mail: tab42@cornell.edu Abstract Spider webs result from complex behaviours that have evolved under many selective pressures. Webs have been primarily considered to be foraging adaptations, neglecting

Blackledge, Todd

102

Multifunctional three-dimensional macroporous nanoelectronic networks for smart materials  

E-Print Network [OSTI]

Multifunctional three-dimensional macroporous nanoelectronic networks for smart materials Jia Liua incorporation of active nanoelec- tronic networks within 3D materials reveals a powerful approach to smart for creating "very smart" systems, because this would transform conventional inactive materials into active

Heller, Eric

103

CASE REPORT Three-Dimensional Computer Visualization of Forensic  

E-Print Network [OSTI]

CASE REPORT Three-Dimensional Computer Visualization of Forensic Pathology Data Jack March, BA in US courtrooms, it is only recently that forensic computer animations have become an increas- ingly of Nottingham has been influential in the critical investigation of forensic computer graphics reconstruction

Schofield, Damian

104

Teleseismic-Seismic Monitoring At Coso Geothermal Area (1975-1976) | Open  

Open Energy Info (EERE)

Teleseismic-Seismic Monitoring At Coso Geothermal Area (1975-1976) Teleseismic-Seismic Monitoring At Coso Geothermal Area (1975-1976) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Teleseismic-Seismic Monitoring At Coso Geothermal Area (1975-1976) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Teleseismic-Seismic Monitoring Activity Date 1975 - 1976 Usefulness not indicated DOE-funding Unknown Exploration Basis Estimate thermal regime and potential of the system Notes Three-dimensional Q -1 model of the Coso Hot Springs known geothermal resource area was conducted. To complete the model a regional telemetered network of sixteen stations was operated by the U.S. Geological Survey; deployed a portable Centipede array of 26 three-component stations near the

105

Three-dimensional visualization of salt walls and associated fault systems  

SciTech Connect (OSTI)

Abundant three-dimensional (3-D) seismic data from salt provinces have been acquired over the past two decades. These data have been interpreted partly using concepts based on analysis of two-dimensional (2-D) sections through physical and numerical models. Three-dimensional computer visualization of physical models is a recent development that exploits the full potential of model data by displaying even highly irregular geological structures such as convolute salt contacts, strata disrupted by salt tectonics, discontinuous faults, and bedding traces on fault surfaces. We used computer visualization techniques to display and analyze a physical model simulating salt-related structures produced during gravity spreading and gliding. The visualization shows, in realistic 3-D detail, that (1) structures change seaward form tall steep-sided diapirs to squat salt rollers; (2) salt walls change markedly along strike and form branches and relays; (3) subsidence of underlying salt ridges produces irregular turtle-structure closures that tend to have multiple seals; (4) links that laterally connect reservoirs in adjacent rafts are most common in upper stratigraphic levels and seaward positions; and (5) traps adjacent to curved salt walls in map view become increasingly asymmetric with depth, and inner arc traps tend to have smaller area but larger closure compared to outer arc traps. These observations can be applied to exploration of salt-related structural traps on the shelf and slope of divergent continental margins.

Guglielmo, G. Jr.; Jackson, M.P.A.; Vendeville, B.C. [Univ. of Texas, Austin, TX (United States)

1997-01-01T23:59:59.000Z

106

Three-dimensional magnetotelluric characterization of the Coso geothermal  

Open Energy Info (EERE)

magnetotelluric characterization of the Coso geothermal magnetotelluric characterization of the Coso geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Three-dimensional magnetotelluric characterization of the Coso geothermal field Details Activities (1) Areas (1) Regions (0) Abstract: A dense grid of 125 magnetotelluric (MT) stations plus a single line of contiguous bipole array profiling has been acquired over the east flank of the Coso geothermal system, CA, USA. Due to production related electromagnetic (EM) noise the permanent observatory at Parkfield, CA was used as a remote reference to suppress this cultural EM noise interference. These data have been inverted to a fully three-dimensional (3D) resistivity model. This model shows the controlling geological structures possibly

107

Space-times admitting a three-dimensional conformal group  

E-Print Network [OSTI]

Perfect fluid space-times admitting a three-dimensional Lie group of conformal motions containing a two-dimensional Abelian Lie subgroup of isometries are studied. Demanding that the conformal Killing vector be proper (i.e., not homothetic nor Killing), all such space-times are classified according to the structure of their corresponding three-dimensional conformal Lie group and the nature of their corresponding orbits (that are assumed to be non-null). Each metric is then explicitly displayed in coordinates adapted to the symmetry vectors. Attention is then restricted to the diagonal case, and exact perfect fluid solutions are obtained in both the cases in which the fluid four-velocity is tangential or orthogonal to the conformal orbits, as well as in the more general "tilting" case.

J. Carot; A. A. Coley; A. M. Sintes

2000-05-16T23:59:59.000Z

108

Three-dimensional effects on energetic particle confinement and stability  

SciTech Connect (OSTI)

Energetic particle populations in magnetic confinement systems are sensitive to symmetry-breaking effects due to their low collisionality and long confined path lengths. Broken symmetry is present to some extent in all toroidal devices. As such effects preclude the existence of an ignorable coordinate, a fully three-dimensional analysis is necessary, beginning with the lowest order (equilibrium) magnetic fields. Three-dimensional techniques that have been extensively developed for stellarator configurations are readily adapted to other devices such as rippled tokamaks and helical states in reversed field pinches. This paper will describe the methods and present an overview of recent examples that use these techniques for the modeling of energetic particle confinement, Alfven mode structure and fast ion instabilities.

Spong, D. A. [One Bethel Valley Road, Bldg. 5700, P. O. Box 2008, MS-6169, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6169 (United States)

2011-05-15T23:59:59.000Z

109

Three dimensional electromagnetic wavepackets in a plasma: Spatiotemporal modulational instability  

SciTech Connect (OSTI)

The nonlinear interaction of an intense electromagnetic beam with relativistic collisionless unmagnetized plasma is investigated by invoking the reductive perturbation technique, resting on the model of three-dimensional nonlinear Schrödinger (NLS) equation with cubic nonlinearity which incorporates the effects of self-focusing, self-phase modulation, and diffraction on wave propagation. Relying on the derived NLS equation, the occurrence of spatiotemporal modulational instability is investigated in detail.

Borhanian, J.; Hosseini Faradonbe, F. [Department of Physics, Faculty of Science, University of Mohaghegh Ardabili, P. O. Box 179, Ardabil (Iran, Islamic Republic of)] [Department of Physics, Faculty of Science, University of Mohaghegh Ardabili, P. O. Box 179, Ardabil (Iran, Islamic Republic of)

2014-04-15T23:59:59.000Z

110

Acoustic mapping of pelagic fish distribution and abundance in relation to a seismic shooting area off the Norwegian west coast  

Science Journals Connector (OSTI)

In April 1999 seismic investigations started in an area off western Norway as part of an ordinary three-dimensional survey, using a vessel with two seismic sources, each of 20 air guns and 10 hydrophone streamers. The seismic sources, towed at a depth of 8 m, were alternatively fired every 25 m along 51 transects, each 51 525 m long, separated from adjacent transects by 500 m. The possible influence of this seismic activity on pelagic fish (herring, blue whiting and mesopelagic species) was investigated in two ways. First, the distribution and abundance within the seismic area and the surrounding waters up to 30–50 km away were mapped acoustically three times. In all three surveys the acoustic abundance of pelagic fish was higher outside than inside the seismic shooting area, indicating a long-term effect of the seismic activity. Secondly, the acoustic abundance was recorded directly prior to and after shooting along some of the seismic transects. In these comparisons no differences were found, indicating that the shooting had insignificant short-term scaring effects. However, both blue whiting and mesopelagic species were found in deeper waters in periods with shooting compared to periods without shooting, indicating that vertical movement rather than horizontal movement could be a short-term reaction to this noise.

Aril Slotte; Kaare Hansen; John Dalen; Egil Ona

2004-01-01T23:59:59.000Z

111

Three dimensional amorphous silicon/microcrystalline silicon solar cells  

DOE Patents [OSTI]

Three dimensional deep contact amorphous silicon/microcrystalline silicon (a-Si/{micro}c-Si) solar cells are disclosed which use deep (high aspect ratio) p and n contacts to create high electric fields within the carrier collection volume material of the cell. The deep contacts are fabricated using repetitive pulsed laser doping so as to create the high aspect p and n contacts. By the provision of the deep contacts which penetrate the electric field deep into the material where the high strength of the field can collect many of the carriers, thereby resulting in a high efficiency solar cell. 4 figs.

Kaschmitter, J.L.

1996-07-23T23:59:59.000Z

112

Three-dimensional Josephson-junction arrays: Static magnetic response  

SciTech Connect (OSTI)

In this work we present a simple three-dimensional Josephson-junction array model: a cube with twelve junctions, one on each edge. The low-field magnetic response of the system is studied numerically for arbitrary directions of the applied field. In this model the magnetic energy of the circulating currents is taken into account by introducing an effective mutual inductance matrix. The lower threshold field for flux penetration is determined in a closed analytic form for field directions perpendicular to one cube side. {copyright} {ital 1998} {ital The American Physical Society}

De Luca, R.; Di Matteo, T. [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy)] [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy); Tuohimaa, A.; Paasi, J. [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)] [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)

1998-01-01T23:59:59.000Z

113

Methods for preparation of three-dimensional bodies  

SciTech Connect (OSTI)

Processes for mechanically fabricating two and three-dimensional fibrous monolith composites include preparing a fibrous monolith filament from a core composition of a first powder material and a boundary material of a second powder material. The filament includes a first portion of the core composition surrounded by a second portion of the boundary composition. One or more filaments are extruded through a mechanically-controlled deposition nozzle onto a working surface to create a fibrous monolith composite object. The objects may be formed directly from computer models and have complex geometries.

Mulligan, Anthony C. (Tucson, AZ); Rigali, Mark J. (Carlsbad, NM); Sutaria, Manish P. (Malden, MA); Artz, Gregory J. (Tucson, AZ); Gafner, Felix H. (Tucson, AZ); Vaidyanathan, K. Ranji (Tucson, AZ)

2008-06-17T23:59:59.000Z

114

Singular eigenfunctions for the three-dimensional radiative transport equation  

E-Print Network [OSTI]

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

Manabu Machida

2013-09-07T23:59:59.000Z

115

Ising Model Coupled to Three-Dimensional Quantum Gravity  

E-Print Network [OSTI]

We have performed Monte Carlo simulations of the Ising model coupled to three-dimensional quantum gravity based on a summation over dynamical triangulations. These were done both in the microcanonical ensemble, with the number of points in the triangulation and the number of Ising spins fixed, and in the grand canoncal ensemble. We have investigated the two possible cases of the spins living on the vertices of the triangulation (``diect'' case) and the spins living in the middle of the tetrahedra (``dual'' case). We observed phase transitions which are probably second order, and found that the dual implementation more effectively couples the spins to the quantum gravity.

C. F. Baillie

1992-05-09T23:59:59.000Z

116

THREE-DIMENSIONAL WAVY HELIOSPHERIC CURRENT SHEET DRIFTS  

SciTech Connect (OSTI)

We present an analytic method to determine the directions of the three-dimensional (3D) heliospheric current sheet (HCS) drift for any tilt angle based on Parker's heliospheric magnetic field and compare it with published two-dimensional and quasi-3D methods. We also present a new approach to determine the magnitude of the 3D HCS drift numerically. Implications of these new methods for the solar modulation of Galactic cosmic rays are considered and compared with results from prior methods reported in the literature. Our results support the concept that HCS drift plays an important role in the solar modulation of cosmic rays.

Pei, C.; Bieber, J. W.; Clem, J. [Department of Physics and Astronomy and Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States); Burger, R. A., E-mail: pei@physics.udel.edu [Centre for Space Research, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520 (South Africa)

2012-01-10T23:59:59.000Z

117

Three-dimensional Chern-Simons black holes  

SciTech Connect (OSTI)

We construct black hole solutions to three-dimensional Einstein-Maxwell theory with both gravitational and electromagnetic Chern-Simons terms. These intrinsically rotating solutions are geodesically complete, and causally regular within a certain parameter range. Their mass, angular momentum and entropy are found to satisfy the first law of black hole thermodynamics. These Chern-Simons black holes admit a four-parameter local isometry algebra, which generically is sl(2,R)xR, and may be generated from the corresponding vacua by local coordinate transformations.

Moussa, Karim Ait [Laboratoire de Physique Mathematique et Physique Subatomique, Departement de Physique, Faculte des Sciences, Universite Mentouri, Constantine 25000 (Algeria); Clement, Gerard; Leygnac, Cedric [Laboratoire de Physique Theorique LAPTH (CNRS), B.P.110, F-74941 Annecy-le-Vieux cedex (France); Guennoune, Hakim [Laboratoire de Physique Theorique LAPTH (CNRS), B.P.110, F-74941 Annecy-le-Vieux cedex (France); Departement de Physique, Faculte des Sciences, Universite Ferhat Abbas, Setif 19000 (Algeria)

2008-09-15T23:59:59.000Z

118

Ghost imaging for three-dimensional optical security  

SciTech Connect (OSTI)

Ghost imaging has become increasingly popular in quantum and optical application fields. Here, we report three-dimensional (3D) optical security using ghost imaging. The series of random phase-only masks are sparsified, which are further converted into particle-like distributions placed in 3D space. We show that either an optical or digital approach can be employed for the encoding. The results illustrate that a larger key space can be generated due to the application of 3D space compared with previous works.

Chen, Wen, E-mail: elechenw@nus.edu.sg; Chen, Xudong [Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583 (Singapore)] [Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583 (Singapore)

2013-11-25T23:59:59.000Z

119

Three-dimensional light trap for reflective particles  

DOE Patents [OSTI]

A system for containing either a reflective particle or a particle having an index of refraction lower than that of the surrounding media in a three-dimensional light cage. A light beam from a single source illuminates an optics system and generates a set of at least three discrete focussed beams that emanate from a single exit aperture and focus on to a focal plane located close to the particle. The set of focal spots defines a ring that surrounds the particle. The set of focussed beams creates a "light cage" and circumscribes a zone of no light within which the particle lies. The surrounding beams apply constraining forces (created by radiation pressure) to the particle, thereby containing it in a three-dimensional force field trap. A diffractive element, such as an aperture multiplexed lens, or either a Dammann grating or phase element in combination with a focusing lens, may be used to generate the beams. A zoom lens may be used to adjust the size of the light cage, permitting particles of various sizes to be captured and contained.

Neal, Daniel R. (Tijeras, NM)

1999-01-01T23:59:59.000Z

120

Surfactant effects on the interaction of a three dimensional vortex pair with a free surface; and,  

E-Print Network [OSTI]

In part I of the thesis, a canonical problem of three dimensional surfactant hydrody namics, the three-dimensional laminar interaction between a clean or contaminated free surface and a vortical flow underneath is considered. ...

Zhang, Xiang, 1969-

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" from the National Library of EnergyBeta (NLEBeta).
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121

X-ray tomography and three-dimensional image analysis of epoxy-glass syntactic foams  

Science Journals Connector (OSTI)

...voxels). The standard deviation of...the three-dimensional images at the interface between the...phase in three-dimensional was quite straightforward...value of the standard deviation...optical device measuring the diffraction...

2006-01-01T23:59:59.000Z

122

Isotropic three-dimensional MRI-Fricke-infused gel dosimetry  

SciTech Connect (OSTI)

Purpose: Fricke-infused gel has been shown to be a simple and attainable method for the conformal measurement of absorbed radiation dose. Nevertheless, its accuracy is seriously hindered by the irreversible ferric ion diffusion during magnetic resonance imaging, particularly when three-dimensional (3D) dose measurement in radiosurgery is considered. In this study, the authors developed a fast three-dimensional spin-echo based Fricke gel dosimetry technique to reduce the adverse effects of ferric ion diffusion and to obtain an accurate isotropic 3D dose measurement. Methods: A skull shaped phantom containing Fricke-infused gel was irradiated using Leksell Gamma Knife. The rapid image-based dosimetry technique was applied with the use of a 3D fast spin-echo magnetic resonance imaging sequence. The authors mathematically derived and experimentally validated the correlations between dose-response characteristics and parameters of the 3D fast spin-echo MR imaging sequence. Absorbed dose profiles were assessed and compared to the calculated profiles given by the Gamma Knife treatment planning system. Coefficient of variance (CV%) and coefficient of determination (R{sup 2}) were used to evaluate the precision of dose-response curve estimation. The agreement between the measured and the planned 3D dose distributions was quantified by gamma-index analysis of two acceptance criteria. Results: Proper magnetic resonance imaging parameters were explored to render an accurate three-dimensional absorbed dose mapping with a 1 mm{sup 3} isotropic image resolution. The efficacy of the dose-response estimation was approved by an R{sup 2} > 0.99 and an average CV% of 1.6%. Average gamma pass-rate between the experimentally measured and GammaPlan calculated dose distributions were 83.8% and 99.7% for 2%/2 and 3%/3 mm criteria, respectively. Conclusions: With the designed MR imaging sequence and parameters, total 3D MR acquisition time was confined to within 20 min postirradiation, during which time ferric ion diffusion effects were negligible, thus enabling an accurate 3D radiation dose measurement.

Cho, Nai-Yu; Chu, Woei-Chyn [Institute of Biomedical Engineering, National Yang-Ming University, Taipei 11221, Taiwan (China); Huang, Sung-Cheng [Department of Molecular and Medical Pharmacology, UCLA David Geffen School of Medicine, Los Angeles, California 90095 (United States); Chung, Wen-Yuh [Neurological Institute, Taipei Veterans General Hospital, Taipei 11217, Taiwan (China); Guo, Wan-Yuo [Department of Radiology, Taipei Veterans General Hospital, Taipei 11217, Taiwan (China)

2013-05-15T23:59:59.000Z

123

Simulation of three-dimensional shear flow around a nozzle-afterbody at high speeds  

SciTech Connect (OSTI)

In this paper, turbulent shear flows at supersonic and hypersonic speeds around a nozzle-afterbody are simulated. The three-dimensional, Reynolds-averaged Navier-Stokes equations are solved by a finite-volume and implicit method. The convective and the pressure terms are differenced by an upwind-biased algorithm. The effect of turbulence is incorporated by a modified Baldwin-Lomax eddy viscosity model. The success of the standard Baldwin-Lomax model for this flow type is shown by comparing it to a laminar case. These modifications made to the model are also shown to improve flow prediction when compared to the standard Baldwin-Lomax model. These modifications to the model reflect the effects of high compressibility, multiple walls, vortices near walls, and turbulent memory effects in the shear layer. This numerically simulated complex flowfield includes a supersonic duct flow, a hypersonic flow over an external double corner, a flow through a non-axisymmetric, internal-external nozzle, and a three-dimensional shear layer. The specific application is for the flow around the nozzle-afterbody of a generic hypersonic vehicle powered by a scramjet engine. The computed pressure distributions compared favorably with the experimentally obtained surface and off-surface flow surveys.

Baysal, O.; Hoffman, W.B. (Mechanical Engineering and Mechanics Dept., Old Dominion Univ., Norfolk, VA (United States))

1992-06-01T23:59:59.000Z

124

Chapter 5 - Seismic Attribute Analysis  

Science Journals Connector (OSTI)

Abstract Seismic attributes are the geometry, kinematics, dynamics, and statistical characteristics of seismic waves, which are extracted or derived from prestack and poststack seismic data by mathematical transformation. For a long time, seismic data only have been used to track lineups of seismic waves in order to delineate the geometry and structural characteristics of oil and gas reservoirs. In fact, there is rich information about lithology, physical properties, and fluid composition hidden in seismic data. As we all know, the characteristics of the seismic signal are caused by petrophysical characteristics and its variability. Geoscientists need to do seismic attribute analyses and calibration in order to eliminate data distortion and dig out lithological and physical properties hidden in seismic data. Especially when people are eager to cognize the heterogeneity of lithological and stratigraphic reservoirs, the rich information about the spatial variability in seismic data seems more precious. In recent years, with the advancement of reservoir interpretation and the needs of three dimensional (3-D) seismic data analysis, scientists have found out more and more new attributes on the basis of conventional seismic attributes. At the same time, methods and means used for the calculation and analysis of seismic attributes are increasing. Seismic attribute analysis has been successfully applied in reservoir lithological prediction, hydrocarbon potential prediction, and reservoir property estimates.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

125

Seismic wave propagation in coal seams: finite element modelling and field tests  

Science Journals Connector (OSTI)

In-seam seismic (ISS) refers to methods which utilise artificially generated channel waves trapped in coal seam to locate geologic disturbances and mine voids. It is one of the basic geophysical methods for underground survey. The advantage of ISS is that seismic energy is better preserved in coal seams and seismic waves can travel and be detected over much larger distances in comparison with body waves which radiate three-dimensionally. It is also convenient and reasonable to set up a two-dimensional model to study the wave propagation characteristics. Using a commercial finite element method (FEM) modelling software, both transmission and reflection tests were simulated. Field experiments of the ISS technology have been carried out at underground coal mines. The results demonstrated that two-dimensional FEM modelling appears to be a satisfactory approach for ISS simulation, and if used properly, ISS technology can successfully detect mine voids and geologic discontinuities.

Hongliang Wang; Maochen Ge

2014-01-01T23:59:59.000Z

126

Three dimensional imaging detector employing wavelength-shifting optical fibers  

DOE Patents [OSTI]

A novel detector element structure and method for its use is provided. In a preferred embodiment, one or more inorganic scintillating crystals are coupled through wavelength shifting optical fibers (WLSFs) to position sensitive photomultipliers (PS-PMTs). The superior detector configuration in accordance with this invention is designed for an array of applications in high spatial resolution gamma ray sensing with particular application to SPECT, PET and PVI imaging systems. The design provides better position resolution than prior art devices at a lower total cost. By employing wavelength shifting fibers (WLSFs), the sensor configuration of this invention can operate with a significant reduction in the number of photomultipliers and electronics channels, while potentially improving the resolution of the system by allowing three dimensional reconstruction of energy deposition positions.

Worstell, William A. (Framingham, MA)

1997-01-01T23:59:59.000Z

127

Three dimensional imaging detector employing wavelength-shifting optical fibers  

DOE Patents [OSTI]

A novel detector element structure and method for its use is provided. In a preferred embodiment, one or more inorganic scintillating crystals are coupled through wavelength shifting optical fibers (WLSFs) to position sensitive photomultipliers (PS-PMTs). The superior detector configuration in accordance with this invention is designed for an array of applications in high spatial resolution gamma ray sensing with particular application to SPECT, PET and PVI imaging systems. The design provides better position resolution than prior art devices at a lower total cost. By employing wavelength shifting fibers (WLSFs), the sensor configuration of this invention can operate with a significant reduction in the number of photomultipliers and electronics channels, while potentially improving the resolution of the system by allowing three dimensional reconstruction of energy deposition positions. 11 figs.

Worstell, W.A.

1997-02-04T23:59:59.000Z

128

Voro++: a three-dimensional Voronoi cell library in C++  

SciTech Connect (OSTI)

Voro++ is a free software library for the computation of three dimensional Voronoi cells. It is primarily designed for applications in physics and materials science, where the Voronoi tessellation can be a useful tool in the analysis of densely-packed particle systems, such as granular materials or glasses. The software comprises of several C++ classes that can be modified and incorporated into other programs. A command-line utility is also provided that can use most features of the code. Voro++ makes use of a direct cell-by-cell construction, which is particularly suited to handling special boundary conditions and walls. It employs algorithms which are tolerant for numerical precision errors, and it has been successfully employed on very large particle systems.

Rycroft, Chris

2009-01-15T23:59:59.000Z

129

Structures with three dimensional nanofences comprising single crystal segments  

DOE Patents [OSTI]

An article includes a substrate having a surface and a nanofence supported by the surface. The nanofence includes a multiplicity of primary nanorods and branch nanorods, each of the primary nanorods being attached to said substrate, and each of the branch nanorods being attached to a primary nanorods and/or another branch nanorod. The primary and branch nanorods are arranged in a three-dimensional, interconnected, interpenetrating, grid-like network defining interstices within the nanofence. The article further includes an enveloping layer supported by the nanofence, disposed in the interstices, and forming a coating on the primary and branch nanorods. The enveloping layer has a different composition from that of the nanofence and includes a radial p-n single junction solar cell photovoltaic material and/or a radial p-n multiple junction solar cell photovoltaic material.

Goyal, Amit; Wee, Sung-Hun

2013-08-27T23:59:59.000Z

130

Three-dimensional laser cooling at the Doppler limit  

E-Print Network [OSTI]

Many predictions of the theory of Doppler cooling of 2-level atoms, notably the celebrated minimum achievable temperature $T_D=\\hbar \\Gamma/2 k_B$, have never been verified in a three-dimensional geometry. Here, we show that, despite their degenerate level structure, we can use Helium-4 atoms to achieve a situation in which these predictions can be verified. We make measurements of atomic temperatures, magneto-optical trap sizes, and the sensitivity of optical molasses to a power imbalance in the laser beams, finding excellent agreement with the Doppler theory. We show that the special properties of Helium, particularly its small mass and narrow transition linewidth, prevent effective sub-Doppler cooling with red-detuned optical molasses.

Chang, Rockson; Bouton, Quentin; Fang, Yami; Klafka, Tobias; Audo, Kevin; Aspect, Alain; Westbrook, Christoph I; Clément, David

2014-01-01T23:59:59.000Z

131

High performance acoustic three-dimensional image processing system  

SciTech Connect (OSTI)

The reactor vessel of a fast breeder reactor (FBR) is filled with optically opaque liquid sodium, and, therefore, the ultrasonic imaging technique is useful for inspecting in-vessel structures in sodium. The authors have developed a high-speed and high-resolution three-dimensional image processing technique. For imaging in the sodium, a two-dimensional matrix transducer and the M-series transmitting signal were used. The cross correlation processing between the transmitted signal and received signal was used for enhancing the S/N ratio. The image synthesis also attempts the enhancement of resolution by the synthetic aperture focusing technique (SAFT). High-speed processing could be realized by use of parallel processing boards.

Suzuki, T.; Nagai, S.; Maruyama, F. [Toshiba Corp., Yokohama (Japan); Furukawa, H. [JEOL System Technology Co., Ltd., Tokyo (Japan)

1995-08-01T23:59:59.000Z

132

Three-dimensional multifluid simulations of ionospheric loss at Mars from nominal solar wind conditions  

E-Print Network [OSTI]

Three-dimensional multifluid simulations of ionospheric loss at Mars from nominal solar wind (2006), Three-dimensional multifluid simulations of ionospheric loss at Mars from nominal solar wind 2006; accepted 30 June 2006; published 21 September 2006. [1] Three-dimensional multifluid simulations

Harnett , Erika

133

Hyaluronan hydration generates three-dimensional meso-scale structure in engineered collagen tissues  

Science Journals Connector (OSTI)

...generates three-dimensional meso-scale...generation of new interfaces; these novel...tissue three-dimensional structure and...the mean and standard deviation of...was tested by measuring the thickness...generates three-dimensional meso-scale...generation of new interfaces; these novel...

2012-01-01T23:59:59.000Z

134

Simulation of anisotropic wave propagation in Vertical Seismic Profiles  

E-Print Network [OSTI]

they are powerful tools to simulate seismic wave propagation in three-dimensional anisotropic subsurface models. The code is currently under development using a C++ object oriented programming approach because it provides high flexibility in the design of new...

Durussel, Vincent Bernard

2004-09-30T23:59:59.000Z

135

Three-dimensional seismic-reflection imaging of a shallow buried paleochannel  

Science Journals Connector (OSTI)

...sporadic patches of fine sand and silt. Because of the very low hydraulic conductivity , the Alpine clay acts as an aquiclude. A large...such as propane tanks, pipelines, cement well pads, and trailers, the actual CMP fold obtained using a natural bin size of...

Gian Luigi Fradelizio; Alan Levander; Colin A. Zelt

136

Three-dimensional seismic-reflection imaging of a shallow buried paleochannel  

Science Journals Connector (OSTI)

...Aircraft maintenance and repair activities have generated...clay unit with sporadic patches of fine sand and silt...such as propane tanks, pipelines, cement well pads...a) The acquisition patch is a 45 slanted pattern...lines repeat every other patch. Source/receiver spacing...

Gian Luigi Fradelizio; Alan Levander; Colin A. Zelt

137

A three-dimensional crustal seismic velocity model for southern California from a composite event method  

E-Print Network [OSTI]

times from controlled sources, including both refraction shots and quarries. We implement the SIMULPS and S waves from 452,943 events, consisting of local events, regional events and quarry blasts, from 1981

Shearer, Peter

138

Seismic Characterization of Basalt Topography at Two Candidate Sites for the INL Remote-Handled Low-Level Waste Disposal Project  

SciTech Connect (OSTI)

This report presents the seismic refraction results from the depth to bed rock surveys for two areas being considered for the Remote-Handled Low-Level Waste (RH-LLW) disposal facility at the Idaho National Laboratory. The first area (Site 5) surveyed is located southwest of the Advanced Test Reactor Complex and the second (Site 34) is located west of Lincoln Boulevard near the southwest corner of the Idaho Nuclear Technology and Engineering Center (INTEC). At Site 5, large area and smaller-scale detailed surveys were performed. At Site 34, a large area survey was performed. The purpose of the surveys was to define the topography of the interface between the surficial alluvium and underlying basalt. Seismic data were first collected and processed using seismic refraction tomographic inversion. Three-dimensional images for both sites were rendered from the data to image the depth and velocities of the subsurface layers. Based on the interpreted top of basalt data at Site 5, a more detailed survey was conducted to refine depth to basalt. This report briefly covers relevant issues in the collection, processing and inversion of the seismic refraction data and in the imaging process. Included are the parameters for inversion and result rendering and visualization such as the inclusion of physical features. Results from the processing effort presented in this report include fence diagrams of the earth model, for the large area surveys and iso-velocity surfaces and cross sections from the detailed survey.

Jeff Sondrup; Gail Heath; Trent Armstrong; Annette Shafer; Jesse Bennett; Clark Scott

2011-04-01T23:59:59.000Z

139

Three-dimensional lattice Boltzmann model for magnetic reconnection  

SciTech Connect (OSTI)

We develop a three-dimensional (3D) lattice Boltzmann model that recovers in the continuous limit the two-fluids theory for plasmas, and consequently includes the generalized Ohm's law. The model reproduces the magnetic reconnection process just by giving the right initial equilibrium conditions in the magnetotail, without any assumption on the resistivity in the diffusive region. In this model, the plasma is handled similar to two fluids with an interaction term, each one with distribution functions associated to a cubic lattice with 19 velocities (D3Q19). The electromagnetic fields are considered as a third fluid with an external force on a cubic lattice with 13 velocities (D3Q13). The model can simulate either viscous fluids in the incompressible limit or nonviscous compressible fluids, and successfully reproduces both the Hartmann flow and the magnetic reconnection in the magnetotail. The reconnection rate in the magnetotail obtained with this model lies between R=0.062 and R=0.073, in good agreement with the observations.

Mendoza, M.; Munoz, J. D. [Simulation of Physical Systems Group, Universidad Nacional de Colombia, Departamento de Fisica, Crr 30 45-03, Ed. 404, Of. 348, Bogota D.C. (Colombia)

2008-02-15T23:59:59.000Z

140

Three?Dimensional Reconstruction Optical System Using Shadows Triangulation  

Science Journals Connector (OSTI)

In this work is developed a three?dimensional reconstruction system using the Shades3D tool of the Matlab® Programming Language and materials of low cost such as webcam camera a stick a weak structured lighting system composed by a desk lamp and observation plane in which the object is located. The reconstruction is obtained through a triangulation process that is executed after acquiring a sequence of images of the scene with a shadow projected on the object; additionally an image filtering process is done for obtaining only the part of the scene that will be reconstructed. Previously it is necessary to develop a calibration process for determining the internal camera geometric and optical characteristics (intrinsic parameters) and the 3D position and orientation of the camera frame relative to a certain world coordinate system (extrinsic parameters). The lamp and the stick are used to produce a shadow which scans the object; in this technique it is not necessary to know the position of the light source instead the triangulation is obtained using shadow plane produced by intersection between the stick and the illumination pattern. The webcam camera captures all images with the shadow scanning the object and Shades3D tool processes all information taking into account captured images and calibration parameters. Likewise this technique is evaluated in the reconstruction of parts of the human body and its application in the detection of external abnormalities and elaboration of prosthesis or implant.

J. Leiner Barba; Q. Lorena Vargas; M. Cesar Torres; V. Lorenzo Mattos

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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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to obtain the most current and comprehensive results.


141

THREE-DIMENSIONAL RECONNECTION INVOLVING MAGNETIC FLUX ROPES  

SciTech Connect (OSTI)

Two and three magnetic flux ropes are created and studied in a well-diagnosed laboratory experiment. The twisted helical bundles of field lines rotate and collide with each other over time. In the two rope case, reverse current layers indicative of reconnection are observed. Using a high spatial and temporal resolution three-dimensional volume data set in both cases, quasi-separatrix layers (QSLs) are identified in the magnetic field. Originally developed in the context of solar magnetic reconnection, QSLs are thought to be preferred sites for reconnection. This is verified in these studies. In the case of three flux ropes there are multiple QSLs, which come and go in time. The divergence of the field lines within the QSLs and the field line motion is presented. In all cases, it is observed that the reconnection is patchy in space and bursty in time. Although it occurs at localized positions it is the result of the nonlocal behavior of the flux ropes.

Gekelman, W.; Van Compernolle, B. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Lawrence, E. [Princeton Plasma Physics Laboratory, Princeton, NJ (United States)

2012-07-10T23:59:59.000Z

142

Three dimensional Casimir piston for massive scalar fields  

E-Print Network [OSTI]

We consider Casimir force acting on a three dimensional rectangular piston due to a massive scalar field subject to periodic, Dirichlet and Neumann boundary conditions. Exponential cut-off method is used to derive the Casimir energy in the interior region and the exterior region separated by the piston. It is shown that the divergent term of the Casimir force acting on the piston due to the interior region cancels with that due to the exterior region, thus render a finite well-defined Casimir force acting on the piston. Explicit expressions for the total Casimir force acting on the piston is derived, which show that the Casimir force is always attractive for all the different boundary conditions considered. As a function of a -- the distance from the piston to the opposite wall, it is found that the magnitude of the Casimir force behaves like $1/a^4$ when $a\\to 0^+$ and decays exponentially when $a\\to \\infty$. Moreover, the magnitude of the Casimir force is always a decreasing function of a. On the other hand, passing from massless to massive, we find that the effect of the mass is insignificant when a is small, but the magnitude of the force is decreased for large a in the massive case.

S. C. Lim; L. P. Teo

2008-07-23T23:59:59.000Z

143

Three-dimensional lithofacies variations in hyaloclastite deposits  

Science Journals Connector (OSTI)

Analysis of the spatial lithofacies variability within lava-fed delta formations in southern Iceland has revealed complex three-dimensional volcanic architectures in hyaloclastite deposits in non-glacial settings. Two depositional environments are studied, (a) lava entering a marine embayment (Stóri-Nupur) and; (b) lava advancing into a body of water of the flanks of a Surtseyan cone (Hjörleifshöfði). Interaction between environmental factors such as shoreline geomorphology, water depth, wave energy levels, the nature of the lava transport system, lava supply rate all affect the resulting lava deltas creating complex lithofacies arrangements and stacking patterns. Recognised here are two types of hyaloclastite deltas. One of syn-sedimentary origin (Hjörleifshöfði) and one derived from primary fragmentation processes (Stóri-Nupur). Syn-sedimentary systems are dominated by destabilisation of the hyaloclastite pile leading to reworking downslope and share similarities to alluvial delta systems. Conversely, primary fragmented systems are controlled by waxing and waning cycles in volcanic effusivity whereby the hyaloclastite unit recorded is not the product of one lava flow rather than one eruptive event.

T.J. Watton; D.A. Jerram; T. Thordarson; R.J. Davies

2013-01-01T23:59:59.000Z

144

Three-Dimensional Electromagnetic High Frequency Axisymmetric Cavity Scars.  

SciTech Connect (OSTI)

This report examines the localization of high frequency electromagnetic fi elds in three-dimensional axisymmetric cavities along periodic paths between opposing sides of the cavity. The cases where these orbits lead to unstable localized modes are known as scars. This report treats both the case where the opposing sides, or mirrors, are convex, where there are no interior foci, and the case where they are concave, leading to interior foci. The scalar problem is treated fi rst but the approximations required to treat the vector fi eld components are also examined. Particular att ention is focused on the normalization through the electromagnetic energy theorem. Both projections of the fi eld along the scarred orbit as well as point statistics are examined. Statistical comparisons are m ade with a numerical calculation of the scars run with an axisymmetric simulation. This axisymmetric cas eformstheoppositeextreme(wherethetwomirror radii at each end of the ray orbit are equal) from the two -dimensional solution examined previously (where one mirror radius is vastly di ff erent from the other). The enhancement of the fi eldontheorbitaxiscanbe larger here than in the two-dimensional case. Intentionally Left Blank

Warne, Larry K.; Jorgenson, Roy E.

2014-10-01T23:59:59.000Z

145

Image resolution analysis: a new, robust approach to seismic survey design  

E-Print Network [OSTI]

-to-noise ratio in image resolution . . 64 3.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . 65 IV EFFICACY ASSESSMENT OF COMPETING 3-D ACQUI- SITION DESIGNS OVER A SALT DOME MODEL : : : : : : : 69 4.1 Introduction... . . . . . . . . . . . . . . . . . . . . . . . . 69 4.2 Resolution and acquisition geometry in homogeneous media: Multi-o set versus single-o set surveys. . . . . . 70 4.3 Survey design for a salt dome model . . . . . . . . . . . 74 4.3.1 Subsalt imaging . . . . . . . . . . . . . . . . . . . 81 4...

Tzimeas, Constantinos

2005-08-29T23:59:59.000Z

146

High-resolution 2D surface seismic reflection survey to detect abandoned old coal mine works to improve mine safety  

Science Journals Connector (OSTI)

...coal seismic studies in the Appalachia Coal Basin, the calculated average...seismic method in the U.K. coal mining industrya by Fairbairn et al...interpretation workstation for the coal industrya by Gochioco (Mining Engineering, 1991). a Modeling...

Lawrence M. Gochioco; Tim Miller; Fred Ruev; Jr.

147

Imaging Three Dimensional Two-particle Correlations for Heavy-Ion Reaction Studies  

E-Print Network [OSTI]

We report an extension of the source imaging method for analyzing three-dimensional sources from three-dimensional correlations. Our technique consists of expanding the correlation data and the underlying source function in spherical harmonics and inverting the resulting system of one-dimensional integral equations. With this strategy, we can image the source function quickly, even with the finely binned data sets common in three-dimensional analyses.

D. A. Brown; P. Danielewicz; A. Enokizono; M. Heffner; R. Soltz; S. Pratt

2005-07-06T23:59:59.000Z

148

Imaging three dimensional two-particle correlations for heavy-ion reaction studies  

SciTech Connect (OSTI)

We report an extension of the source imaging method for analyzing three-dimensional sources from three-dimensional correlations. Our technique consists of expanding the correlation data and the underlying source function in spherical harmonics and inverting the resulting system of one-dimensional integral equations. With this strategy, we can image the source function quickly, even with the finely binned data sets common in three-dimensional analyses.

Brown, D.A.; Enokizono, A.; Heffner, M.; Soltz, R.; Danielewicz, P.; Pratt, S. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Michigan State University, East Lansing, Michigan 48824 (United States)

2005-11-01T23:59:59.000Z

149

Imaging Three Dimensional Two-Particle Correlations for Heavy-Ion Reaction Studies  

SciTech Connect (OSTI)

The authors report an extension of the source imaging method for analyzing three-dimensional sources from three-dimensional correlations. The technique consists of expanding the correlation data and the underlying source function in spherical harmonics and inverting the resulting system of one-dimensional integral equations. With this strategy, they can image the source function quickly, even with the extremely large data sets common in three-dimensional analyses.

Brown, D; Enokizono, A; Heffner, M; Soltz, R; Danielewicz, P; Pratt, S

2005-06-27T23:59:59.000Z

150

Method for inverting reflection trace data from 3-D and 4-D seismic surveys and identifying subsurface fluid and pathways in and among hydrocarbon reservoirs based on impedance models  

DOE Patents [OSTI]

A method is disclosed for inverting 3-D seismic reflection data obtained from seismic surveys to derive impedance models for a subsurface region, and for inversion of multiple 3-D seismic surveys (i.e., 4-D seismic surveys) of the same subsurface volume, separated in time to allow for dynamic fluid migration, such that small scale structure and regions of fluid and dynamic fluid flow within the subsurface volume being studied can be identified. The method allows for the mapping and quantification of available hydrocarbons within a reservoir and is thus useful for hydrocarbon prospecting and reservoir management. An iterative seismic inversion scheme constrained by actual well log data which uses a time/depth dependent seismic source function is employed to derive impedance models from 3-D and 4-D seismic datasets. The impedance values can be region grown to better isolate the low impedance hydrocarbon bearing regions. Impedance data derived from multiple 3-D seismic surveys of the same volume can be compared to identify regions of dynamic evolution and bypassed pay. Effective Oil Saturation or net oil thickness can also be derived from the impedance data and used for quantitative assessment of prospective drilling targets and reservoir management. 20 figs.

He, W.; Anderson, R.N.

1998-08-25T23:59:59.000Z

151

Method for inverting reflection trace data from 3-D and 4-D seismic surveys and identifying subsurface fluid and pathways in and among hydrocarbon reservoirs based on impedance models  

DOE Patents [OSTI]

A method is disclosed for inverting 3-D seismic reflection data obtained from seismic surveys to derive impedance models for a subsurface region, and for inversion of multiple 3-D seismic surveys (i.e., 4-D seismic surveys) of the same subsurface volume, separated in time to allow for dynamic fluid migration, such that small scale structure and regions of fluid and dynamic fluid flow within the subsurface volume being studied can be identified. The method allows for the mapping and quantification of available hydrocarbons within a reservoir and is thus useful for hydrocarbon prospecting and reservoir management. An iterative seismic inversion scheme constrained by actual well log data which uses a time/depth dependent seismic source function is employed to derive impedance models from 3-D and 4-D seismic datasets. The impedance values can be region grown to better isolate the low impedance hydrocarbon bearing regions. Impedance data derived from multiple 3-D seismic surveys of the same volume can be compared to identify regions of dynamic evolution and bypassed pay. Effective Oil Saturation or net oil thickness can also be derived from the impedance data and used for quantitative assessment of prospective drilling targets and reservoir management.

He, Wei (New Milford, NJ); Anderson, Roger N. (New York, NY)

1998-01-01T23:59:59.000Z

152

Energetic particles from three-dimensional magnetic reconnection events in the Swarthmore Spheromak Experimenta...  

E-Print Network [OSTI]

Energetic particles from three-dimensional magnetic reconnection events in the Swarthmore Spheromak 11 January 2002 Measurements are presented from the Swarthmore Spheromak Experiment SSX M. R. Brown

Brown, Michael R.

153

E-Print Network 3.0 - advanced three-dimensional environmental...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

To capture three-dimensional flow 12;March 4 2010 2 effects and their impact on turbine... been looking at advancing free stream turbine performance to achieve economic...

154

Three-dimensional modelling and geothermal process simulation  

SciTech Connect (OSTI)

The subsurface geological model or 3-D GIS is constructed from three kinds of objects, which are a lithotope (in boundary representation), a number of fault systems, and volumetric textures (vector fields). The chief task of the model is to yield an estimate of the conductance tensors (fluid permeability and thermal conductivity) throughout an array of voxels. This is input as material properties to a FEHM numerical physical process model. The main task of the FEHM process model is to distinguish regions of convective from regions of conductive heat flow, and to estimate the fluid phase, pressure and flow paths. The temperature, geochemical, and seismic data provide the physical constraints on the process. The conductance tensors in the Franciscan Complex are to be derived by the addition of two components. The isotropic component is a stochastic spatial variable due to disruption of lithologies in melange. The deviatoric component is deterministic, due to smoothness and continuity in the textural vector fields. This decomposition probably also applies to the engineering hydrogeological properties of shallow terrestrial fluvial systems. However there are differences in quantity. The isotropic component is much more variable in the Franciscan, to the point where volumetric averages are misleading, and it may be necessary to select that component from several, discrete possible states. The deviatoric component is interpolated using a textural vector field. The Franciscan field is much more complicated, and contains internal singularities. 27 refs., 10 figs.

Burns, K.L.

1990-01-01T23:59:59.000Z

155

On the use of different matrix products to solve finite three-dimensional Ising systems  

E-Print Network [OSTI]

1119 On the use of different matrix products to solve finite three-dimensional Ising systems Ph analytiquement des systèmes d'Ising de taille finie. A titre d'exemple, on déter- mine l'expression exacte de la analytical solutions of finite three-dimensional Ising systems. As an example, the exact partition function

Paris-Sud XI, Université de

156

Simple scenarios of onset of chaos in three-dimensional maps  

E-Print Network [OSTI]

We give a qualitative description of two main routes to chaos in three-dimensional maps. We discuss Shilnikov scenario of transition to spiral chaos and a scenario of transition to discrete Lorenz-like and figure-eight strange attractors. The theory is illustrated by numerical analysis of three-dimensional Henon-like maps and Poincare maps in models of nonholonomic mechanics.

Alexander Gonchenko; Sergey Gonchenko; Alexey Kazakov; Dmitry Turaev

2014-11-30T23:59:59.000Z

157

Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body  

E-Print Network [OSTI]

Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body J.fischer@univ-poitiers.fr Proceedings of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 2335 #12;Aerodynamic. The present work is an experimental study of the aerodynamic noise radiated by a three-dimensional simplified

Paris-Sud XI, Université de

158

Lattice Boltzmann solutions of the three-dimensional planetary geostrophic equations  

E-Print Network [OSTI]

Lattice Boltzmann solutions of the three-dimensional planetary geostrophic equations by Rick Salmon1 ABSTRACT We use the lattice Boltzmann method as the basis for a three-dimensional, numerical ocean. By the special nature of its construction,the lattice Boltzmann model resolves upwelling boundarylayers

Salmon, Rick

159

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields  

E-Print Network [OSTI]

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields A on the static magnetic response of a three-dimensional 8 · 8 · 8 network of Josephson junctions is studied of one-dimensional and two-dimensional Josephson junction networks (1D, 2D-JJNs) has been extensively

Di Matteo, Tiziana

160

Analysis of three-dimensional heat transfer in micro-channel heat sinks  

E-Print Network [OSTI]

, the three-dimensional fluid flow and heat transfer in a rectangular micro-channel heat sink are ana- lyzedAnalysis of three-dimensional heat transfer in micro-channel heat sinks Weilin Qu, Issam Mudawar numerically using water as the cooling fluid. The heat sink consists of a 1-cm2 silicon wafer. The micro

Qu, Weilin

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Tomoeye: A Matlab package for visualization of three-dimensional tomographic models  

E-Print Network [OSTI]

Tomoeye: A Matlab package for visualization of three-dimensional tomographic models A. Gorbatov models. Using a set of four Matlab programs, multiscale tomographic models can be explored in Cartesian. Sambridge (2004), Tomoeye: A Matlab package for visualization of three-dimensional tomographic models

Sambridge, Malcolm

162

Analysis of free-space optical interconnects for the three-dimensional optoelectronic stacked processor  

E-Print Network [OSTI]

Analysis of free-space optical interconnects for the three-dimensional optoelectronic stacked of free-space optical interconnect for the three-dimensional optoelectronic stacked processor (3DOESP) has VLSI; Optoelectronics; VCSELs 1. Introduction Current electronic interconnection technology cannot keep

Esener, Sadik C.

163

Characterizing Three-Dimensional Textile Ceramic Composites Using Synchrotron X-Ray Micro-Computed-Tomography  

E-Print Network [OSTI]

, Thousand Oaks, CA 91360 Three-dimensional (3-D) images of two ceramic-matrix textile composites were studied represent a new class of integrally woven ceramic matrix composites for high-temperature appliCharacterizing Three-Dimensional Textile Ceramic Composites Using Synchrotron X-Ray Micro

Ritchie, Robert

164

Self-assembled three-dimensional conducting network of single-wall carbon nanotubes  

E-Print Network [OSTI]

Self-assembled three-dimensional conducting network of single-wall carbon nanotubes Graciela B (Received 11 March 2004; accepted 8 June 2004) We described here the self-assembling of a three-dimensional array of single-wall nanotubes (SWNTs). The distinctive choice of materials allowed for the self-assembly

Hone, James

165

Three-dimensional tracking and behaviour monitoring of multiple fruit flies  

Science Journals Connector (OSTI)

...mean zero and standard deviation of...reconstructed three-dimensional points. NRE...a metric for measuring the accuracy...R. Soc. Interface 5, 1181-1191...real-time three-dimensional tracking of...R. Soc. Interface 8, 395-409...3D trajectory measuring of large numbers...

2013-01-01T23:59:59.000Z

166

Performance Measures of Game Controllers in a Three-Dimensional Environment  

E-Print Network [OSTI]

Performance Measures of Game Controllers in a Three-Dimensional Environment Chris Klochek, I. Scott differences between input devices in constrained three- dimensional environments, similar to "first Leading Analysis, and Mean Time-to-Reacquire. All measures are continuous, as they evaluate movement

MacKenzie, Scott

167

Multi-camera real-time three-dimensional tracking of multiple flying animals  

Science Journals Connector (OSTI)

...originally extracted two-dimensional points is a measure...verified the three-dimensional coordinates and distances...Because we are using standard calibration and estimation...latency of the three-dimensional reconstruction by synchronizing...experimental setup and then measuring the duration between...

2011-01-01T23:59:59.000Z

168

Image Analysis of Defocused Single-Molecule Images for Three-Dimensional Molecule Orientation Studies  

E-Print Network [OSTI]

Image Analysis of Defocused Single-Molecule Images for Three-Dimensional Molecule Orientation applied to determine three- dimensional molecule orientations in defocused single-molecule images. The developed algorithm exploits the excellent agreement between electrodynamic calculations of single-molecule

Enderlein, Jörg

169

Bubble transport in three-dimensional laminar gravity-driven flow numerical results  

E-Print Network [OSTI]

Bubble transport in three-dimensional laminar gravity-driven flow ­ numerical results Laurent Pilon is the second part of a study on bubble transport, growth and shrinkage in three-dimensional gravity driven flow equation is solved for the bubble density function using the backward method of characteristics. The zeroth

Pilon, Laurent

170

Bubble transport in three-dimensional laminar gravity-driven flow mathematical formulation  

E-Print Network [OSTI]

Bubble transport in three-dimensional laminar gravity-driven flow ­ mathematical formulation This paper presents a complete set of coupled equations that govern the bubble transport in three-dimensional gravity-driven flow. The model accounts for bubble growth or shrinkage due to pressure and temperature

Pilon, Laurent

171

Saline tracer visualized with three-dimensional electrical resistivity tomography: Field-scale spatial moment analysis  

E-Print Network [OSTI]

Saline tracer visualized with three-dimensional electrical resistivity tomography: Field; accepted 14 February 2005; published 24 May 2005. [1] Cross-well electrical resistivity tomography (ERT., and S. M. Gorelick (2005), Saline tracer visualized with three-dimensional electrical resistivity

Singha, Kamini

172

Full Reviews: Seismicity and Seismic  

Broader source: Energy.gov [DOE]

Below are the project presentations and respective peer reviewer comments for Seismicity and Seismic.

173

Properties of original impactors estimated from three-dimensional analysis of whole Stardust tracks  

SciTech Connect (OSTI)

The Stardust mission captured comet Wild 2 particles in aerogel at 6.1 km s{sup -1}. We performed high-resolution three-dimensional imaging and X-ray fluorescence mapping of whole cometary tracks in aerogel. We present the results of a survey of track structures using laser scanning confocal microscopy, including measurements of track volumes, entry hole size, and cross-sectional profiles. We compare various methods for measuring track parameters. We demonstrate a methodology for discerning hypervelocity particle ablation rates using synchrotron-based X-ray fluorescence, combined with mass and volume estimates of original impactors derived from measured track properties. Finally, we present a rough framework for reconstruction of original impactor size, and volume of volatilized material, using our measured parameters. The bulk of this work is in direct support of nondestructive analysis and identification of cometary grains in whole tracks, and its eventual application to the reconstruction of the size, shape, porosity, and chemical composition of whole Stardust impactors.

Greenberg, Michael; Ebel, Denton S. (AMNH)

2012-07-25T23:59:59.000Z

174

Reflection Survey At Dixie Valley Geothermal Field Area (Blackwell, Et Al.,  

Open Energy Info (EERE)

9) 9) Exploration Activity Details Location Dixie Valley Geothermal Field Area Exploration Technique Reflection Survey Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes "The seismic reflection profiles of the range front structures are difficult to interpret because of he steep dips and 3-d fault zone geometry, in the-classical paper by Okaya and Thompson (1985) the range-bounding fault is not imaged as they proposed. The reflection seismic studies are the most useful of the geophysical techniques also the most expensive. The reflection data are two-dimensional making structural interpretation complicated for the three-dimensional geometry of the basin so that the other structural studied have been critical in correctly interpreting the seismic profiles. There are many

175

Model-Evaluation Tools for Three-Dimensional Cloud Verification via Spaceborne Active Sensors  

Science Journals Connector (OSTI)

Clouds pose many operational hazards to the aviation community in terms of ceilings and visibility, turbulence, and aircraft icing. Realistic descriptions of the three-dimensional (3D) distribution and temporal evolution of clouds in numerical ...

Steven D. Miller; Courtney E. Weeks; Randy G. Bullock; John M. Forsythe; Paul A. Kucera; Barbara G. Brown; Cory A. Wolff; Philip T. Partain; Andrew S. Jones; David B. Johnson

2014-09-01T23:59:59.000Z

176

Simulation of three-dimensional solar wind disturbances and resulting geomagnetic storms  

Science Journals Connector (OSTI)

A kinematic method of representing the three-dimensional solar wind flow is devised by taking into account qualitatively the stream-stream interaction which leads to the formation of a shock pair. Solar wind p...

K. Hakamada; S. -I. Akasofu

1982-01-01T23:59:59.000Z

177

Three-dimensional nanostructures fabricated by stacking pre-patterned monocrystalline silicon nanomembranes  

E-Print Network [OSTI]

This thesis considers the viability of nanomembrane handling and stacking approaches to enable the fabrication of three-dimensional (3D) nano-structured materials. Sequentially stacking previously-patterned membranes to ...

Fucetola, Corey Patrick

2013-01-01T23:59:59.000Z

178

Design, fabrication, and testing of a three-dimensional monolithic compliant six-axis nanopositioner  

E-Print Network [OSTI]

The purpose of this research was to demonstrate the feasibility for creating a three-dimensional monolithic compliant six-axis nanopositioner. Much of this work was based off of the original two-dimensional HexFlex manipulator ...

Labuz, James (James R.)

2006-01-01T23:59:59.000Z

179

Lattice Boltzmann algorithm for three–dimensional liquid–crystal hydrodynamics  

Science Journals Connector (OSTI)

...P. Boon and P. V. Coveney Lattice Boltzmann algorithm for three-dimensional...hydrodynamics We describe a lattice Boltzmann algorithm to simulate liquid-crystal...nematics with an imposed twist. lattice Boltzmann|liquid crystal|hydrodynamics...

2004-01-01T23:59:59.000Z

180

Lattice-Boltzmann Simulations of Three-Dimensional Fluid Flow on a Desktop Computer  

Science Journals Connector (OSTI)

Lattice-Boltzmann Simulations of Three-Dimensional Fluid Flow on a Desktop Computer ... Algorithms for building lattices and solving the equations are not trivial, and memory demands are relatively high. ...

Jeffrey D. Brewster

2007-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Bimetallic bars with local control of composition by three-dimensional printing  

E-Print Network [OSTI]

Three Dimensional Printing (3DP) is a process that enables the fabrication of geometrically complex parts directly from computer-aided design (CAD) models. The success of 3DP as an alternative manufacturing technology to ...

Techapiesancharoenkij, Ratchatee, 1979-

2004-01-01T23:59:59.000Z

182

An interactive three-dimensional computer graphic simulation of the upper extremity  

E-Print Network [OSTI]

A three-dimensional computer graphic simulation which hics. allows for the arbitrary placement of axes of motion with respect to skeletal structures is described. The simulation, developed on a Sum UItraSPARC high performance workstation integrated...

Pickard, Julie Marie

1998-01-01T23:59:59.000Z

183

Accelerated Publications Three-Dimensional Structure of DesVI from Streptomyces Venezuelae: A Sugar  

E-Print Network [OSTI]

Accelerated Publications Three-Dimensional Structure of DesVI from Streptomyces Venezuelae: A Sugar for the biosynthesis of dTDP-desosamine in Streptomyces Venezuelae, with the last step catalyzed by DesVI, an N

Holden, Hazel

184

Three-dimensional vortical structures in the wake of a flexible flapping foil  

E-Print Network [OSTI]

This project aims to gain a qualitative view of the three-dimensional vortical structures of a flexible flapping foil at Reynolds number 164. Flexible foils were fabricated, coated with fluorescent dye, and towed with heave ...

Krueger, Matthew J

2005-01-01T23:59:59.000Z

185

Thermal Modeling and Device Noise Properties of Three-Dimensional-SOI Technology  

E-Print Network [OSTI]

Thermal test structures and ring oscillators (ROs) are fabricated in 0.18-mum three-dimensional (3-D)-SOI technology. Measurements and electrothermal simulations show that thermal and parasitic effects due to 3-D packaging ...

Chen, Tze Wee

186

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

E-Print Network [OSTI]

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

Ko, Min Seok

2009-05-15T23:59:59.000Z

187

Shape-Controlled Synthesis of Hybrid Nanomaterials via Three-Dimensional Hydrodynamic Focusing  

Science Journals Connector (OSTI)

Shape-Controlled Synthesis of Hybrid Nanomaterials via Three-Dimensional Hydrodynamic Focusing ... Components of this work were conducted at the Penn State node of the NSF-funded National Nanotechnology Infrastructure Network. ...

Mengqian Lu; Shikuan Yang; Yi-Ping Ho; Christopher L. Grigsby; Kam W. Leong; Tony Jun Huang

2014-09-30T23:59:59.000Z

188

Three-dimensional range data compression using computer graphics rendering pipeline  

Science Journals Connector (OSTI)

This paper presents the idea of naturally encoding three-dimensional (3D) range data into regular two-dimensional (2D) images utilizing computer graphics rendering pipeline. The...

Zhang, Song

2012-01-01T23:59:59.000Z

189

Characterization and requirements for Cu-Cu bonds for three-dimensional integrated circuits  

E-Print Network [OSTI]

Three-dimensional integrated circuit (3D IC) technology enables heterogeneous integration of devices fabricated from different technologies, and reduces global RC delay by increasing the device density per unit chip area. ...

Tadepalli, Rajappa, 1979-

2007-01-01T23:59:59.000Z

190

Monolithic three-dimensional electrochemical energy storage system on aerogel or nanotube scaffold  

DOE Patents [OSTI]

A monolithic three-dimensional electrochemical energy storage system is provided on an aerogel or nanotube scaffold. An anode, separator, cathode, and cathodic current collector are deposited on the aerogel or nanotube scaffold.

Farmer, Joseph Collin; Stadermann, Michael

2014-07-15T23:59:59.000Z

191

Membrane technology for the fabrication of three-dimensional photonic crystals  

E-Print Network [OSTI]

Three-dimensional photonic crystals hold tremendous promise toward the realization of truly integrated photonic circuits on a single substrate. Nanofabrication techniques currently limit the ability to create the multilayer ...

Patel, Amil Ashok, 1979-

2010-01-01T23:59:59.000Z

192

E-Print Network 3.0 - arbitrary three-dimensional geometries...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Science 34 doi: 10.1098rsif.2008.0374.focus published online 20 January 2009J. R. Soc. Interface Summary: , biophotonic nanostructure colour prediction of a three-dimensional...

193

Three-Dimensional Simulation of Carmustine Delivery to a Patient-Specific Brain Tumor  

E-Print Network [OSTI]

This study presents the recent development of three-dimensional patient-specific simulation of carmustine delivery to brain tumor that highlights several crucial factors affecting the delivery. The simulation utilizes the ...

Arifin, Davis Yohanes

194

Green Water Flow Kinematics and Impact Pressure on a Three Dimensional Model Structure  

E-Print Network [OSTI]

Flow kinematics of green water due to plunging breaking waves interacting with a simplified, three-dimensional model structure was investigated in laboratory. Two breaking wave conditions were tested: one with waves impinging and breaking...

Ariyarathne, Hanchapola Appuhamilage Kusalika Suranjani

2011-10-21T23:59:59.000Z

195

Characterization of coal oil using three-dimensional excitation and emission matrix fluorescence spectroscopy  

Science Journals Connector (OSTI)

Three-dimensional (3D) excitation-emission matrix (EEM) fluorescence spectroscopy is applied to characterize the coal oil. The results show that the 3D fluorescence spectra of coal oil...

Xiao, Xue; Zhang, Yujun; Wang, Zhigang; Jin, Dan; Yin, Gaofang; Liu, Wenqing

2009-01-01T23:59:59.000Z

196

Three-dimensional simulation of combustion processes in coke-battery furnace chambers  

Science Journals Connector (OSTI)

A three-dimensional model of the heating wall in a coke battery is developed by means of the Fluent CFD program. The results of simulation are in satisfactory agreement with experimental data. The mathematical...

M. V. Isaev; I. A. Sultanguzin

2010-08-01T23:59:59.000Z

197

The Design of Three-Dimensional Model for the Economic Evaluation of the Coal Enterprise Informationization  

Science Journals Connector (OSTI)

According to the coal enterprise characteristics and the current coal enterprise informationization construction circumstance, the author designed a three-dimensional model for the economic evaluation of the coal

Qing-wen Yuan; Shu-wei Yu

2013-01-01T23:59:59.000Z

198

Three-Dimensional Circulation Structure of Summer Heavy Rainfall in Central North China  

Science Journals Connector (OSTI)

Based on daily station rainfall observation and Japanese 25-year reanalysis data during 1981~2010, a three-dimensional circulation structure formed before summer heavy rainfalls in central North China (CNC) is revealed in this study. Composite ...

Wei Sun; Rucong Yu; Jian Li; Weihua Yuan

199

Turbulence prediction in two- and three-dimensional bundle flows using Large Eddy Simulation  

E-Print Network [OSTI]

TURBULENCE PREDICTION IN TWO- AND THREE-DIMENSIONAL BUNDLE FLOWS USING LARGE EDDY SIMULATION A Thesis by WAEL ABDUL-HAMID IBRAHIM Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... Prediction in Two- and Three-Dimensional Bundle Flows Using Large Eddy Simulation. (May 1994) Wael Abdul-Hamid Ibrahim, B. S. Alexandria University Chair of Advisory Committee: Dr. Yassin A. Hassan Flow turbulence is a familiar phenomenon in everyday life...

Ibrahim, Wael Abdul-Hamid

1994-01-01T23:59:59.000Z

200

A three dimensional finite element code for the analysis of damage in helically wound composite cylinders  

E-Print Network [OSTI]

A THREE DIMENSIONAL FINITE ELEMENT CODE FOR THE ANALYSIS OF DAMAGE IN HELICALLY WOUND COMPOSITE CYLINDERS A Thesis MARVIiN AiNTHONY ZOCHER Submitted to the Office of Graduate Studies of Texas Ag:M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 1990 Major Subject; Aerospace Engineering A THREE DIMENSIONAL FINITE ELEMENT CODE FOR THE ANALYSIS OF DAMAGE IN HELICALLY WOUND COMPOSITE CYLINDERS A Thesis by i%1ARVIN ANTHONY ZOCHER Approved...

Zocher, Marvin Anthony

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Autonomous three dimensional Newtonian systems which admit Lie and Noether point symmetries  

E-Print Network [OSTI]

We determine the autonomous three dimensional Newtonian systems which admit Lie point symmetries and the three dimensional autonomous Newtonian Hamiltonian systems, which admit Noether point symmetries. We apply the results in order to determine the two dimensional Hamiltonian dynamical systems which move in a space of constant non-vanishing curvature and are integrable via Noether point symmetries. The derivation of the results is geometric and can be extended naturally to higher dimensions.

M. Tsamparlis; A. Paliathanasis; L. Karpathopoulos

2012-05-18T23:59:59.000Z

202

Comparisons of Two- and Three-Dimensional Convection in Type I X-ray Bursts  

E-Print Network [OSTI]

We perform the first detailed three-dimensional simulation of low Mach number convection preceding thermonuclear ignition in a mixed H/He X-ray burst. Our simulations include a moderate-sized, approximate network that captures hydrogen and helium burning up through rp-process breakout. We look in detail at the difference between two- and three-dimensional convective fields, including the details of the turbulent convection.

Zingale, M; Nonaka, A; Almgren, A S; Bell, J B

2014-01-01T23:59:59.000Z

203

Quantifying the correlation between spatially defined oxygen gradients and cell fate in an engineered three-dimensional culture model  

Science Journals Connector (OSTI)

...Machine). A standard curve was established...typically measuring 3.5 mm in...the three-dimensional construct for...middle region interface corresponds...and three-dimensional culture remains...error bars for standard error. Figure-7...receptor in three-dimensional basement membrane...

2014-01-01T23:59:59.000Z

204

Recapitulating tumour microenvironment in chitosan–gelatin three-dimensional scaffolds: an improved in vitro tumour model  

Science Journals Connector (OSTI)

...tumour microenvironment in chitosan-gelatin three-dimensional...three-dimensional scaffold based on chitosan and gelatin was fabricated...polystyrene, on three-dimensional chitosan-gelatin scaffolds and in...cyclin-dependent kinase inhibitor p21 (a negative regulator...

2012-01-01T23:59:59.000Z

205

Effects of Sounds From Seismic Air Guns on Fish Behavior and Catch Rates  

Science Journals Connector (OSTI)

Seismic surveys are performed to explore for oil ... Concerns have been raised about the impacts of seismic air gun emissions on marine life, and fishermen in particular claim that seismic surveys have a serious ...

Svein Løkkeborg; Egil Ona; Aud Vold; Are Salthaug

2012-01-01T23:59:59.000Z

206

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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

207

A Bme Solution Of The Stochastic Three-Dimensional Laplace Equation  

Open Energy Info (EERE)

Bme Solution Of The Stochastic Three-Dimensional Laplace Equation Bme Solution Of The Stochastic Three-Dimensional Laplace Equation Representing A Geothermal Field Subject To Site-Specific Information Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Bme Solution Of The Stochastic Three-Dimensional Laplace Equation Representing A Geothermal Field Subject To Site-Specific Information Details Activities (0) Areas (0) Regions (0) Abstract: This work develops a model of the geothermal field in the Nea Kessani region (Greece) by means of the Bayesian maximum entropy (BME) method, which describes the temperature variations across space in the underground geological formations. The geothermal field is formed by a thermal reservoir consisting of arcosic sandstones. The temperature distribution vs depth was first investigated by the Greek Institute of

208

System and method for representing and manipulating three-dimensional objects on massively parallel architectures  

DOE Patents [OSTI]

A parallel computing system is described that comprises a plurality of uniquely labeled, parallel processors, each processor capable of modelling a three-dimensional object that includes a plurality of vertices, faces and edges. The system comprises a front-end processor for issuing a modelling command to the parallel processors, relating to a three-dimensional object. Each parallel processor, in response to the command and through the use of its own unique label, creates a directed-edge (d-edge) data structure that uniquely relates an edge of the three-dimensional object to one face of the object. Each d-edge data structure at least includes vertex descriptions of the edge and a description of the one face. As a result, each processor, in response to the modelling command, operates upon a small component of the model and generates results, in parallel with all other processors, without the need for processor-to-processor intercommunication.

Karasick, Michael S. (Ridgefield, CT); Strip, David R. (Albuquerque, NM)

1996-01-01T23:59:59.000Z

209

Characterization of three dimensional fiber orientation in short-fiber composites  

SciTech Connect (OSTI)

A mathematical procedure for recovering from image analysis the three dimensional nonsymmetric fiber-orientation distribution in short-fiber composites is proposed. Microphotographs from two orthogonal faces of a composite sample are needed to determine the three dimensional fiber orientation. A simple weighting function is derived to take into account the probability of intercepting fibers at varying inclination angles. The present procedure improves the previous works of other researchers in the following two aspects. First, it can obtain the single-angle fiber-orientation distribution from one micrograph in reference to the normal of the photographed surface. This distribution is often needed in predicting the mechanical and physical properties of short-fiber composites in this direction. Second, no symmetry in fiber-orientation distribution is assumed in the determination of the three dimensional fiber-orientation, which makes the present procedure more practical and versatile.

Zhu, Yuntian T.; Blumenthal, W.R.

1995-05-01T23:59:59.000Z

210

A magnetotelluric survey on Manitoulin Island and Bruce Peninsula along GLIMPCE seismic line J: black shales mask the Grenville Front  

Science Journals Connector (OSTI)

......edsDawson J. B., et al. Ontario Geological Survey, 1985. Oil shale assessment project drillholes for regional correlations...Dawson, J. B. er al. Ontario Geological Survey, 1985. Oil shale assessment project drillholes for regional correlations......

M. Mareschal; R. D. Kurtz; M. Chouteau; R. Chakridi

1991-04-01T23:59:59.000Z

211

Electronic specific heat and magnetic susceptibility in bismuth thin films under three-dimensional quantization  

Science Journals Connector (OSTI)

Three-dimensional quantization of the energy spectrum of electrons or holes can be realized in semimetal bismuth by applying a magnetic field perpendicular to the bismuth thin film. Numerical calculations were made of the energy (of the charge carriers), electronic specific heat, electronic magnetization, and magnetic susceptibility in three-dimensionally quantized bismuth films. The nonparabolic, ellipsoidal electronic band model for bismuth was used and the films were perpendicular to the trigonal axis. The aforementioned thermodynamical quantities were systematically evaluated as functions of temperature, film thickness, and magnetic field intensity.

H. T. Chu and Xiao-di Qi

1989-09-15T23:59:59.000Z

212

Laser-processed three dimensional graphitic electrodes for diamond radiation detectors  

SciTech Connect (OSTI)

We have used an original approach for diamond detectors where three dimensional buried graphitic electrodes are processed in the bulk of a diamond substrate via laser-induced graphitization. Prototype made of polycrystalline chemical vapor deposition diamond was fabricated using a nanosecond UV laser. Its charge collection efficiency was evaluated using ?-particles emitted by a 241-Americium source. An improved charge collection efficiency was measured proving that laser micro-machining of diamond is a valid option for the future fabrication of three dimensional diamond detectors.

Caylar, Beno?-carett; Pomorski, Michal; Bergonzo, Philippe [CEA-LIST, Diamond Sensors Laboratory, Gif-sur-Yvette F-91191 (France)] [CEA-LIST, Diamond Sensors Laboratory, Gif-sur-Yvette F-91191 (France)

2013-07-22T23:59:59.000Z

213

Ultramicroscopy: three-dimensional visualization of neuronal networks in the whole mouse brain  

E-Print Network [OSTI]

Ultramicroscopy: three-dimensional visualization of neuronal networks in the whole mouse brain Hans entire neuronal networks for analysis in the intact brain has been impossible up to now. Techniques like in micro computer tomogrpahy and mMRI does not resolve individual cells1,2. On a microscopic scale

Cai, Long

214

Evaluation of Economic Impact of Three-Dimensional Modeling in Precast Concrete Engineering  

E-Print Network [OSTI]

Evaluation of Economic Impact of Three-Dimensional Modeling in Precast Concrete Engineering Rafael of the economic viability of computer- ization of the engineering and production processes in construc- tion. It also establishes a bench mark of engineering costs for North American precast companies. The bench mark

Sacks, Rafael

215

Three-Dimensional Graphene-Carbon Nanotube Hybrid for High-Performance Enzymatic Biofuel Cells  

Science Journals Connector (OSTI)

Three-Dimensional Graphene-Carbon Nanotube Hybrid for High-Performance Enzymatic Biofuel Cells ... Enzymatic biofuel cells (EBFCs) are green energy devices which are capable of harvesting electricity from renewable and abundantly available biofuels using enzymes as the catalysts for oxidation of biofuels (most commonly, glucose) and reduction of oxidizers (most commonly, oxygen). ... power from environmentally friendly biomass or biofuels. ...

Kenath Priyanka Prasad; Yun Chen; Peng Chen

2014-02-17T23:59:59.000Z

216

Development of a Three-Dimensional Ball Rotation Sensing System using Optical Mouse Sensors  

E-Print Network [OSTI]

to the case of a ball wheel. The system measures surface speed by using two or more optical mouse sensorsDevelopment of a Three-Dimensional Ball Rotation Sensing System using Optical Mouse Sensors Masaaki Kumagai and Ralph L. Hollis Abstract-- Robots using ball(s) as spherical wheels have the advantage

217

Scanning photoelectron microscope for nanoscale three-dimensional spatial-resolved electron spectroscopy for chemical analysis  

E-Print Network [OSTI]

spectroscopy for chemical analysis K. Horiba, Y. Nakamura, N. Nagamura, S. Toyoda, H. Kumigashira et al-level alignment at noble metal/organic interfaces Appl. Phys. Lett. 99, 183302 (2011) Note: Heated sample platform three-dimensional spatial-resolved electron spectroscopy for chemical analysis K. Horiba,1,2,3,a) Y

Miyashita, Yasushi

218

Visualization and comparison of DNA sequences by use of three-dimensional trajectories  

Science Journals Connector (OSTI)

In this paper, we propose a visualization tool for dexoyribonucleic acid (DNA) sequences by the use of three-dimensional (3-D) trajectories (TDT). In the proposed method, four different nucleotides are assigned by four corresponding positions in the ... Keywords: 3-D trajectory, DNA sequence, bioinformatics, data visualization, sequence alignment, sequence correlation

Hsuan T. Chang; Neng-Wen Lo; Wei C. Lu; Chung J. Kuo

2003-01-01T23:59:59.000Z

219

Three-dimensional finite difference time domain modeling of the Earth-ionosphere cavity resonances  

E-Print Network [OSTI]

domain (FDTD) model of Schumann resonances (SR) with a set of classical eigenfrequency and quality factorThree-dimensional finite difference time domain modeling of the Earth-ionosphere cavity resonances-dimensional finite difference time domain modeling of the Earth-ionosphere cavity resonances, Geophys. Res. Lett., 32

Pasko, Victor

220

Three-dimensional finite difference time domain modeling of the Schumann resonance  

E-Print Network [OSTI]

Three-dimensional finite difference time domain modeling of the Schumann resonance parameters to as Schumann resonances and are excited by lightning discharges. The detection of such resonances on other frequency propagation is employed to study the Schumann resonance problems on Titan, Venus, and Mars

Pasko, Victor

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Agricultural and Forest Meteorology 111 (2002) 93108 Estimation of the three-dimensional aerodynamic structure  

E-Print Network [OSTI]

-dimensional aerodynamic structure of a green ash shelterbelt X.H. Zhoua,, J.R. Brandlea, E.S. Takleb,c, C.W. Mized Abstract The three-dimensional aerodynamic structure of a tree shelterbelt is described by two structural be predicted by associating its aerodynamic influence with its struc- ture. The more complex the shelterbelt

Takle, Eugene S.

222

A three-dimensional validation of crack curvature in muscovite mica  

SciTech Connect (OSTI)

Experimental and computational efforts focused on characterizing crack tip curvature in muscovite mica. Wedge-driven cracks were propagated under monochromatic light. Micrographs verified the subtle curvature of the crack front near the free surface. A cohesive approach was employed to model mixed-mode fracture in a three-dimensional framework. Finite element calculations captured the crack curvature observed in experiment.

J. C. Hill; J. W. Foulk III; P. A. Klein; E. P. Chen

2001-01-07T23:59:59.000Z

223

he edge of a torn plastic sheet forms a complex three-dimensional fractal  

E-Print Network [OSTI]

T he edge of a torn plastic sheet forms a complex three-dimensional fractal shape. We have found to the generation of characteristic wavy shapes. We used rectangular plastic sheets pulled from the sides (in the y produce an irreversible plastic deforma- tion of the sheet and, as they are relieved, the deformed sheet

Texas at Austin. University of

224

Three-dimensional limb joint mobility in the early tetrapod Ichthyostega  

Science Journals Connector (OSTI)

... widely. Scan data were segmented in Mimics (Materialise) and reconstructed in the rendering software Autodesk 3D Studio Max. Limb joints were modelled as ball-and-socket joints with three ... .stl files and then reconstructed in the three-dimensional modelling, animation and rendering software Autodesk 3D Studio Max. Because articular cartilage is no longer present on the bones of ...

Stephanie E. Pierce; Jennifer A. Clack; John R. Hutchinson

2012-05-23T23:59:59.000Z

225

High Accuracy Three-Dimensional Radar Sensor Design based on Fuzzy Logic Control Approach  

E-Print Network [OSTI]

High Accuracy Three-Dimensional Radar Sensor Design based on Fuzzy Logic Control Approach Lilin Guo in target tracking. Furthermore, a fuzzy logic controller is proposed to minimize the error between Tracking, Doppler Effect, Fuzzy Logic Controller I. INTRODUCTION Typically, radar sensors are comprised

Fan, Jeffrey

226

Three-Dimensional Carbon Nanotube-Textile Anode for High-Performance Microbial Fuel  

E-Print Network [OSTI]

Three-Dimensional Carbon Nanotube-Textile Anode for High-Performance Microbial Fuel Cells Xing Xie energy into electrical energy. Anode performance is an important factor limiting the power density of MFCs for practical application. Improving the anode design is thus important for enhancing the MFC

Cui, Yi

227

Three-Dimensional Unsteady Multi-stage Turbomachinery Simulations using the Harmonic  

E-Print Network [OSTI]

Three-Dimensional Unsteady Multi-stage Turbomachinery Simulations using the Harmonic Balance-stage turbomachinery problems modeled by the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations. This time. Turbomachinery flows are naturally unsteady mainly due to the relative motion of rotors and stators

Jameson, Antony

228

A THREE DIMENSIONAL NAVIER-STOKES CODE FOR AEROELASTICITY IN TURBOMACHINERY  

E-Print Network [OSTI]

A THREE DIMENSIONAL NAVIER-STOKES CODE FOR AEROELASTICITY IN TURBOMACHINERY I.W. MCBEAN Department. Introduction As designers in the turbomachinery industry strive to design machines that are lighter, more already been used in a 2- dimensional model of aeroelasticity in turbomachinery [17, 9]. The devel- opment

Liu, Feng

229

Three-Dimensional Nonreflecting Boundary Conditions for Swirling Flow in Turbomachinery  

E-Print Network [OSTI]

Three-Dimensional Nonreflecting Boundary Conditions for Swirling Flow in Turbomachinery Pierre turbomachinery problems. Based on the use of precalculated far-field acoustic eigenmodes for a mean flow THERE are different approaches to analyze turbomachinery unsteadiness. These methods vary from the use of linearized

Giles, Mike

230

Three-dimensional MHD simulations of counter-helicity spheromak merging in the Swarthmore Spheromak Experiment  

E-Print Network [OSTI]

Three-dimensional MHD simulations of counter-helicity spheromak merging in the Swarthmore Spheromak September 2011) Recent counter-helicity spheromak merging experiments in the Swarthmore Spheromak Experiment spheromak- and FRC-like characteristics. In this paper, the SSX merging process is studied in detail using

Brown, Michael R.

231

Behavior of Three-Dimensionally Woven Glass Fiber Reinforced Polymeric Bridge Deck  

E-Print Network [OSTI]

Abstract Behavior of Three-Dimensionally Woven Glass Fiber Reinforced Polymeric Bridge Deck Charles M. Johnson, NC State University MS Student Tarek S. Mohamed, NC State University MS Student Sami H polymer (GFRP) bridge decks have been considered os an alternative to conventional steel and concrete

232

ThreeThree--dimensional magnetic fielddimensional magnetic field line reconnection involving fluxline reconnection involving flux  

E-Print Network [OSTI]

ThreeThree--dimensional magnetic fielddimensional magnetic field line reconnection involving helicity) · Relaxation of complex field geometries into simpler ones · Magnetic Field Line Reconnection (2D ~ . magnetic field is measured at 20,000 locations #12;Hodogram of central field line in flux tubes

Shyy, Wei

233

THE ACCELERATION OF THERMAL PROTONS AT PARALLEL COLLISIONLESS SHOCKS: THREE-DIMENSIONAL HYBRID SIMULATIONS  

SciTech Connect (OSTI)

We present three-dimensional hybrid simulations of collisionless shocks that propagate parallel to the background magnetic field to study the acceleration of protons that forms a high-energy tail on the distribution. We focus on the initial acceleration of thermal protons and compare it with results from one-dimensional simulations. We find that for both one- and three-dimensional simulations, particles that end up in the high-energy tail of the distribution later in the simulation gained their initial energy right at the shock. This confirms previous results but is the first to demonstrate this using fully three-dimensional fields. The result is not consistent with the ''thermal leakage'' model. We also show that the gyrocenters of protons in the three-dimensional simulation can drift away from the magnetic field lines on which they started due to the removal of ignorable coordinates that exist in one- and two-dimensional simulations. Our study clarifies the injection problem for diffusive shock acceleration.

Guo Fan [Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Giacalone, Joe, E-mail: guofan.ustc@gmail.com [Department of Planetary Sciences and Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721 (United States)

2013-08-20T23:59:59.000Z

234

Three-dimensional optical tomography with the equation of radiative transfer  

E-Print Network [OSTI]

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

Hielscher, Andreas

235

Three-dimensional Composite Lattice Structures Fabricated by Electrical Discharge Machining  

E-Print Network [OSTI]

construction by means of electrical discharge machining (EDM). First, flat- top corrugated carbon fiber. In this paper, we used electrical discharge machining (EDM)--previously used to transform corrugated metallicThree-dimensional Composite Lattice Structures Fabricated by Electrical Discharge Machining J

Vaziri, Ashkan

236

Self-assembly of three-dimensional prestressed tensegrity structures from DNA  

E-Print Network [OSTI]

Self-assembly of three-dimensional prestressed tensegrity structures from DNA Tim Liedl1,2,3 , Bjo DNA that act as tension-bearing cables. Our DNA ten- segrity structures can self-assemble against of oligodeoxyribonucleotide `staple strands' that self-assemble into tensed structures despite kinetic barriers imposed

Högberg, Björn

237

Self-Assembly of 10-m-Sized Objects into Ordered Three-Dimensional Arrays  

E-Print Network [OSTI]

Self-Assembly of 10-µm-Sized Objects into Ordered Three-Dimensional Arrays Thomas D. Clark, JoeVed March 9, 2001 Abstract: This paper describes the self-assembly of small objectsspolyhedral metal plates functionalized to be hydrophobic or hydrophilic using self-assembled monolayers (SAMs). Self-assembly occurs

Tien, Joe

238

Rapid prototyping of three-dimensional microstructures from multiwalled carbon nanotubes  

E-Print Network [OSTI]

Rapid prototyping of three-dimensional microstructures from multiwalled carbon nanotubes Wei Hsuan-dimensional carbon nanotube structures, whereby a focused laser beam is used to selectively burn local regions of a dense forest of multiwalled carbon nanotubes. Raman spectroscopy and scanning electron microscopy

Cronin, Steve

239

TERMES: An Autonomous Robotic System for Three-Dimensional Collective Construction  

E-Print Network [OSTI]

TERMES: An Autonomous Robotic System for Three-Dimensional Collective Construction Kirstin Petersen is the research area in which autonomous multi-robot systems build structures according to user specifications. Here we present a hardware system and high-level control scheme for autonomous construction of 3D

Napp, Nils

240

Three-dimensional deformation caused by the Bam, Iran, earthquake and the  

E-Print Network [OSTI]

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip on seismogenic faults. We derive the full vector displacement field due to the Bam, Iran, earthquake of moment on deformation associated with the Mw ¼ 6.5 Bam earthquake in Iran determined using the SAR data from the ERS

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Propagation of three--dimensional Alfv'en waves in a stratified, thermally conducting solar wind  

E-Print Network [OSTI]

Propagation of three--dimensional Alfv'en waves in a stratified, thermally conducting solar wind S to the well--known thermal expansion of the solar corona [Parker, 1958, 1963, 1991]. In particular Alfv'en waves in the solar atmosphere and wind, taking into account relevant physical effects

242

Small divisor problem in the theory of three-dimensional water gravity waves  

E-Print Network [OSTI]

Small divisor problem in the theory of three-dimensional water gravity waves G´erard Iooss , Pavel of Sciences, Lavryentyev pr. 15, Novosibirsk 630090, Russia gerard.iooss@inln.cnrs.fr, plotnikov@hydro of small divisors, the main difficulty is the inversion of the linearized operator at a non trivial point

Iooss, Gérard

243

A Three-Dimensional Computational Model of PEM Fuel Cell with Serpentine Gas Channels  

E-Print Network [OSTI]

A Three-Dimensional Computational Model of PEM Fuel Cell with Serpentine Gas Channels by Phong) fuel cell with serpentine gas flow channels is presented in this thesis. This comprehensive model accounts for important transport phenomena in a fuel cell such as heat transfer, mass transfer, electrode

Victoria, University of

244

A Three-Dimensional Variational Data Analysis Method with Recursive Filter for Doppler Radars  

Science Journals Connector (OSTI)

In this paper, a new method of dual-Doppler radar wind analysis based on a three-dimensional variational data assimilation (3DVAR) approach is proposed. In it, a cost function, including background term and radial observation term, is minimized ...

Jidong Gao; Ming Xue; Keith Brewster; Kelvin K. Droegemeier

2004-03-01T23:59:59.000Z

245

Determining Full Three-Dimensional Orientation of Single Anisotropic Nanoparticles by Differential Interference Contrast Microscopy  

SciTech Connect (OSTI)

Keeping track: By combining differential interference contrast (DIC) image pattern recognition with DIC polarization anisotropy, the exact full three-dimensional angular information of individual tilted gold nanorods positioned in the focal plane of the objective lens can be readily determined. The angular rotational modes and kinetics of individual in-focus gold nanorods can thus be resolved dynamically.

Xiao, Lehu; Ha, Ji Won; Wei, Lin; Wang, Gufeng; Fang, Ning

2012-06-26T23:59:59.000Z

246

Three-dimensional simulations of the orientation and structure of reconnection X-lines  

E-Print Network [OSTI]

Three-dimensional simulations of the orientation and structure of reconnection X-lines R. Schreier; published online 4 November 2010 This letter employs Hall magnetohydrodynamic simulations to study X-lines in plasmas of differing densities. Although random initial perturbations trigger the growth of X-lines

247

Finite element simulation of three-dimensional free-surface flow problems  

E-Print Network [OSTI]

surface. The technique is illustrated through an implementation for surface-tension-dominated viscous understanding the evolution and stability of free surfaces provides one of the major incentivesFinite element simulation of three-dimensional free-surface flow problems M.A. Walkley1 £, P

Jimack, Peter

248

A three-dimensional adaptive method based on the iterative grid redistribution  

E-Print Network [OSTI]

such as fluid dynamics, combustion and heat transfer and others, the required density of grid pointsA three-dimensional adaptive method based on the iterative grid redistribution Desheng Wang on iterative grid redistribution technique introduced in [J. Comput. Phys. 159 (2000) 246]. The key step

Wang, Desheng

249

Three Dimensional Time Theory: to Unify the Principles of Basic Quantum Physics and Relativity  

E-Print Network [OSTI]

Interpreting quantum mechanics(QM) by classical physics seems like an old topic; And unified theory is in physics frontier; But because the principles of quantum physics and relativity are so different, any theories of trying to unify 4 nature forces should not be considered as completed without truly unifying the basic principles between QM and relativity. This paper will interpret quantum physics by using two extra dimensional time as quantum hidden variables. I'll show that three dimensional time is a bridge to connect basics quantum physics, relativity and string theory. ``Quantum potential'' in Bohm's quantum hidden variable theory is derived from Einstein Lagrangian in 6-dimensional time-space geometry. Statistical effect in the measurement of single particle, non-local properties, de Broglie wave can be naturally derived from the natural properties of three dimensional time. Berry phase, double-slit interference of single particle, uncertainty relation, wave-packet collapse are discussed. The spin and g factor are derived from geometry of extra two time dimensions. Electron can be expressed as time monopole. In the last part of this paper, I'll discuss the relation between three dimensional time and unified theory. Key words: Quantum hidden variable, Interpreting of quantum physics, Berry phase, three dimensional time, unified theory

Xiaodong Chen

2005-10-03T23:59:59.000Z

250

Ecology Letters, (2003) 6: 13-18 Are three-dimensional spider webs defensive  

E-Print Network [OSTI]

LETTER Ecology Letters, (2003) 6: 13-18 Are three-dimensional spider webs defensive adaptations? Abstract Spider webs result from complex behaviours that have evolved under many selective pressures. Webs risk in the evolution of web architecture. The ecological success of spiders has been attributed to key

Mathis, Wayne N.

251

Quasiballistic correction to the density of states in three-dimensional metal  

Science Journals Connector (OSTI)

We study the exchange correction to the density of states in three-dimensional metal near the Fermi energy. In the ballistic limit, when the distance to the Fermi level exceeds the inverse transport relaxation time 1/?, we find the correction linear in the distance from the Fermi level. By a large parameter ?F?, this ballistic correction exceeds the diffusive correction obtained earlier.

A. A. Koulakov

2000-09-15T23:59:59.000Z

252

Three-dimensional MHD modeling of the solar corona and Arcadi V. Usmanov  

E-Print Network [OSTI]

Three-dimensional MHD modeling of the solar corona and solar wind Arcadi V. Usmanov and Melvyn L with a different numerical algorithm and rotated to match the inclination inferred for the solar dipole from of plasma and magnetic field parameters and in particular the extension of slow wind belt agree fairly well

Usmanov, Arcadi V.

253

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS  

E-Print Network [OSTI]

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS M. Kanik.S. Abstract-- A novel use of bulk metallic glasses in microresonator applications is reported and a method scale glass blowmolding using quartz [2] and Pyrex [3], as well as the isotropic etching of silicon

M'Closkey, Robert T.

254

AN ENERGY-BASED THREE DIMENSIONAL SEGMENTATION APPROACH FOR THE QUANTITATIVE INTERPRETATION  

E-Print Network [OSTI]

, not limited to imaging in 2D. Using emerging methods in electron tomography (see [1] for a recent review tomography allows determination of the three-dimensional structures of cells and tissues at resolutions of electron tomograms, and will be especially useful given the rapid increases in the rate of data acquisition

Minnesota, University of

255

Joint inversion for three dimensional S velocity mantle structure along the Tethyan margin  

E-Print Network [OSTI]

construct a new three dimensional S velocity model and Moho map by jointly inverting regional S and Rayleigh and overlapping nature of the different data sets' resolving power has reduced disparities in resolving power that exist for individual data sets, for example between resolving power for crustal and lower mantle

van der Lee, Suzan

256

Monitoring the Excavation Damaged Zone in Opalinus clay by three dimensional reconstruction of the electrical resistivity  

E-Print Network [OSTI]

of the electrical resistivity in the Mont Terri gallery G-04 Authors: Lesparre N., Adler A., Nicollin F., Gibert D ; Thovert et al., 2011). Here the three dimensional reconstruction of the electrical resistivity aims on the physico-chemical properties of the rock. The study of electrical properties furnishes information

Adler, Andy

257

Three-dimensional computer reconstruction of the South Room Block of the NAN Ruin archaeological site  

E-Print Network [OSTI]

The goal of this study is to demonstrate how the use of three-dimensional computer reconstruction of architecture from an archaelogical site can be used to gain a better understanding of the culture represented. To demonstrate this process, a three...

Kelley, Kirk Lee

2012-06-07T23:59:59.000Z

258

An Effective Approach for Identifying Evolving Three-Dimensional Structural Motifs in Protein  

E-Print Network [OSTI]

have been employed to study the protein folding process, in which a protein acquires its func- tional three-dimensional structure. This has resulted in a large number of protein folding trajectories of the protein folding mechanism. In this paper, we focus on identifying im- portant 3D structural motifs

Yang, Hui

259

Three-dimensional calculation of field emission from carbon nanotubes using a transfer-matrix methodology  

E-Print Network [OSTI]

Three-dimensional calculation of field emission from carbon nanotubes using a transfer- matrix simulations of field emission from carbon nanotubes, using a transfer-matrix methodology. By repeating field, as shown by recent ab-initio calculations [10]. To study field emission from carbon nanotubes, we

Mayer, Alexandre

260

An Evaluation of the Carbon Sequestration Potential of the Cambro-Ordovician Strata of the Illinois and Michigan Basins: Part 1: Evaluation of Phase 2 CO{sub 2} Injection Testing in the Deep Saline Gunter Sandstone Reservoir (Cambro-Ordovician Knox Group), Marvin Blan No. 1 Hancock County, Kentucky Part 2: Time-lapse Three-Dimensional Vertical Seismic Profile (3D-VSP) of Sequestration Target Interval with Injected Fluids  

SciTech Connect (OSTI)

Part 1 of this report focuses on results of the western Kentucky carbon storage test, and provides a basis for evaluating injection and storage of supercritical CO{sub 2} in Cambro-Ordovician carbonate reservoirs throughout the U.S. Midcontinent. This test demonstrated that the Cambro- Ordovician Knox Group, including the Beekmantown Dolomite, Gunter Sandstone, and Copper Ridge Dolomite in stratigraphic succession from shallowest to deepest, had reservoir properties suitable for supercritical CO{sub 2} storage in a deep saline reservoir hosted in carbonate rocks, and that strata with properties sufficient for long-term confinement of supercritical CO{sub 2} were present in the deep subsurface. Injection testing with brine and CO{sub 2} was completed in two phases. The first phase, a joint project by the Kentucky Geological Survey and the Western Kentucky Carbon Storage Foundation, drilled the Marvin Blan No. 1 carbon storage research well and tested the entire Knox Group section in the open borehole � including the Beekmantown Dolomite, Gunter Sandstone, and Copper Ridge Dolomite � at 1152�2255 m, below casing cemented at 1116 m. During Phase 1 injection testing, most of the 297 tonnes of supercritical CO{sub 2} was displaced into porous and permeable sections of the lowermost Beekmantown below 1463 m and Gunter. The wellbore was then temporarily abandoned with a retrievable bridge plug in casing at 1105 m and two downhole pressure-temperature monitoring gauges below the bridge plug pending subsequent testing. Pressure and temperature data were recorded every minute for slightly more than a year, providing a unique record of subsurface reservoir conditions in the Knox. In contrast, Phase 2 testing, this study, tested a mechanically-isolated dolomitic-sandstone interval in the Gunter. Operations in the Phase 2 testing program commenced with retrieval of the bridge plug and long-term pressure gauges, followed by mechanical isolation of the Gunter by plugging the wellbore with cement below the injection zone at 1605.7 m, then cementing a section of a 14-cm casing at 1470.4�1535.6. The resultant 70.1-m test interval at 1535.6�1605.7 m included nearly all of the Gunter sandstone facies. During the Phase 2 injection, 333 tonnes of CO{sub 2} were injected into the thick, lower sand section in the sandy member of the Gunter. Following the completion of testing, the injection zone below casing at 1116 m in the Marvin Blan No. 1 well, and wellbore below 305 m was permanently abandoned with cement plugs and the wellsite reclaimed. The range of most-likely storage capacities found in the Knox in the Marvin Blan No. 1 is 1000 tonnes per surface hectare in the Phase 2 Gunter interval to 8685 tonnes per surface hectare if the entire Knox section were available including the fractured interval near the base of the Copper Ridge. By itself the Gunter lacks sufficient reservoir volume to be considered for CO{sub 2} storage, although it may provide up to 18% of the reservoir volume available in the Knox. Regional extrapolation of CO{sub 2} storage potential based on the results of a single well test can be problematic, although indirect evidence of porosity and permeability can be demonstrated in the form of active saltwater-disposal wells injecting into the Knox. The western Kentucky region suitable for CO{sub 2} storage in the Knox is limited updip, to the east and south, by the depth at which the base of the Maquoketa shale lies above the depth required to ensure storage of CO{sub 2} in its supercritical state and the deepest a commercial well might be drilled for CO{sub 2} storage. The resulting prospective region has an area of approximately 15,600 km{sup 2}, beyond which it is unlikely that suitable Knox reservoirs may be developed. Faults in the subsurface, which serve as conduits for CO{sub 2} migration and compromise sealing strata, may mitigate the area with Knox reservoirs suitable for CO{sub 2} storage. The results of the injection tes

Richard Bowersox; John Hickman; Hannes Leetaru

2012-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-dimensional V p /V s variations for the Coso region, California |  

Open Energy Info (EERE)

p /V s variations for the Coso region, California p /V s variations for the Coso region, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Three-dimensional V p /V s variations for the Coso region, California Details Activities (1) Areas (1) Regions (0) Abstract: Recent seismological studies of the Coso region of southeastern California document both low P wave velocities and abnormal SV attenuation in Indian Wells Valley, south of the Pleistocene volcanics of the Coso Range. In order to learn more about the physical nature of these colocated anomalies, a tomographic inversion for the three-dimensional variations of Vp /Vs the ratio of compressional to shear velocity was performed. Iterative back projection of 2966 shear and compressional wave travel time residuals from local earthquakes recorded on vertical instruments reveals

262

Using Three Dimensional Cell Culture and Tissue Architecture to Monitor an  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Three Dimensional Cell Culture and Tissue Architecture to Monitor an Three Dimensional Cell Culture and Tissue Architecture to Monitor an Adaptive Response in Mammary Epithelial Cells Mina Bissell Lawrence Berkeley National Laboratory Abstract Exposure of tissues to ionizing radiation results in targeted effect on cells as well as non-targeted effects on tissues. Although, targeted effects such as the DNA damage response have been studied extensively, non-targeted effects leading to modification in tissue architecture and tumor progression have been less studied and are not well understood. The mammary gland is a tissue that has been shown to be susceptible to tumor formation and cancer progression following exposure to ionizing radiation. In conjunction with the laboratories of Mary Helen Barcellos-Hoff and Catherine Park we showed previously that in the presence of TGF-β,

263

Three-dimensional anisotropic swelling model for clay shale —a fabric approach  

Science Journals Connector (OSTI)

A three-dimensional model is developed to quantify the anisotropic swelling behaviour of geological materials. The model considers clay mineral particle swelling, fabric anisotropy and induced stress anisotropy as important fundamentals. The double layer theory is used to describe the relationship between the interactive particle stress and the swelling strain. Continuous functions are introduced to represent the fabric density and the particle stress distributions and to permit continuum analyses of three-dimensional swelling problems. The performance of the model has been evaluated against the experimental data obtained from swell tests on a clay soil and two clay shales. It is found that the model provides reasonable predictions on the swelling behaviour of high-density clay shale in which the swelling is dominated by the microstructural particle swelling rather than the macrostructural matrix deformation.

R.C.K. Wong; E.Z. Wang

1997-01-01T23:59:59.000Z

264

Two- and three-dimensional numerical models of internal tide generation at a continental slope  

Science Journals Connector (OSTI)

Some numerical models of internal tide generation at a continental slope are two-dimensional where the along-slope variation is neglected. The energy flux carried by internal tides computed using such two-dimensional models is often underestimated, compared with three-dimensional simulations of the same region, by a factor of 10 or more. The reason for this difference is investigated using both numerical and analytical models. It is shown that in numerical models, it is not the lack of the along-shelf forcing but the use of sponge or radiating conditions at the cross-shelf boundaries that leads to the severe underestimate of the offshore flux. To obtain realistic estimates of energy flux a three-dimensional model with an along-shelf scale of at least 5 internal tide wave lengths at the depth of maximum forcing is necessary.

K. Katsumata

2006-01-01T23:59:59.000Z

265

Comparison of one-, two-, and three-dimensional models for mass transport of radionuclides  

SciTech Connect (OSTI)

This technical memorandum compares one-, two-, and three-dimensional models for studying regional mass transport of radionuclides in groundwater associated with deep repository disposal of high-level radioactive wastes. In addition, this report outlines the general conditions for which a one- or two-dimensional model could be used as an alternate to a three-dimensional model analysis. The investigation includes a review of analytical and numerical models in addition to consideration of such conditions as rock and fluid heterogeneity, anisotropy, boundary and initial conditions, and various geometric shapes of repository sources and sinks. Based upon current hydrologic practice, each review is taken separately and discussed to the extent that the researcher can match his problem conditions with the minimum number of model dimensions necessary for an accurate solution.

Prickett, T.A.; Voorhees, M.L.; Herzog, B.L.

1980-02-01T23:59:59.000Z

266

An experimental and computational study of transonic three-dimensional flow in a turbine cascade  

SciTech Connect (OSTI)

Detailed experimental measurements of the flow in a cascade of turbine rotor blades with a nonplanar end wall are reported. The cascade geometry was chosen to model as closely as possible that of a H.P. gas turbine rotor blade. The blade section is designed for supersonic flow with an exit Mach number of 1.15 and the experiments covered a range of exit Mach numbers from 0.7-1.2. Significant three-dimensional effects were observed and the origin of these is discussed. The measurements are compared with data for the same blade section in a two-dimensional cascade and also with the predictions of two different fully three-dimensional inviscid flow calculation methods. It is found that both these calculations predict the major threedimensional effects on the flow correctly.

Camus, J.J.; Denton, J.D.; Scrivener, C.T.J.; Soulis, J.V.

1984-04-01T23:59:59.000Z

267

Three-dimensional Ion Distribution in a Filtered Vacuum Arc Discharge  

SciTech Connect (OSTI)

Three-dimensional measurements of the ion flux along the filter of a magnetically filtered d-c vacuum arc are presented. The device includes a metallic plasma-generating chamber with cooper electrodes coupled to a substrate chamber through a quarter-torus magnetic filter. The filtering magnetic field was high enough to magnetize the electrons but not the ions. The ion current distribution was studied using a multi-element Cu probes, placed at three different positions along the filter. The ion saturation current of each probe was measured by biasing the probe at -70V with respect the grounded anode. Preliminary results of the three dimensional ion flux distribution and the floating potential of the plasma as functions of the bias filter voltage and magnetic field intensity are reported.

Kelly, H.; Marquez, A.; Pirrera, M. [Instituto de Fisica del Plasma, CONICET-Dpto. de Fisica, FCEN, UBA, Ciudad Universitaria Pab. 1 (1428EHA) Ciudad de Buenos Aires (Argentina)

2006-12-04T23:59:59.000Z

268

Using three dimensional silicone ``boots`` to solve complex remedial design problems in curtain walls  

SciTech Connect (OSTI)

Stick system curtain wall leak problems are frequently caused by water entry at the splice joints of the curtain wall frame and failure of the internal metal joinery seals. Remedial solutions involving occupied buildings inevitably face the multiple constraints of existing construction and business operations not present during the original curtain wall construction. In most cases, even partial disassembly of the curtain wall for internal seal repairs is not feasible. Remedial solutions which must be executed from the exterior of the curtain wall often involve wet-applied or preformed sealant tape bridge joints. However, some of the more complex joints cannot be repaired effectively or economically with the conventional bridge joint. Fortunately, custom fabricated three-dimensional preformed sealant boots are becoming available to address these situations. This paper discusses the design considerations and the selective use of three-dimensional preformed boots in sealing complex joint geometry that would not be effective with the conventional two-dimensional bridge joint.

Chen, Y.J. [AIA, Inc., San Francisco, CA (United States)

1998-12-31T23:59:59.000Z

269

Three dimensional finite element methods: Their role in the design of DC accelerator systems  

SciTech Connect (OSTI)

High Voltage Engineering has designed, built and tested a 2 MV dual irradiation system that will be applied for radiation damage studies and ion beam material modification. The system consists of two independent accelerators which support simultaneous proton and electron irradiation (energy range 100 keV - 2 MeV) of target sizes of up to 300 Multiplication-Sign 300 mm{sup 2}. Three dimensional finite element methods were used in the design of various parts of the system. The electrostatic solver was used to quantify essential parameters of the solid-state power supply generating the DC high voltage. The magnetostatic solver and ray tracing were used to optimize the electron/ion beam transport. Close agreement between design and measurements of the accelerator characteristics as well as beam performance indicate the usefulness of three dimensional finite element methods during accelerator system design.

Podaru, Nicolae C.; Gottdang, A.; Mous, D. J. W. [High Voltage Engineering Europa B.V., P.O. Box 99, 3800 AB, Amersfoort (Netherlands)

2013-04-19T23:59:59.000Z

270

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

E-Print Network [OSTI]

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

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

2004-10-12T23:59:59.000Z

271

Three-Dimensional Inversion of Magnetotelluric Data on a PC, Methodology  

Open Energy Info (EERE)

Dimensional Inversion of Magnetotelluric Data on a PC, Methodology Dimensional Inversion of Magnetotelluric Data on a PC, Methodology and Applications to the Coso Geothermal Field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Three-Dimensional Inversion of Magnetotelluric Data on a PC, Methodology and Applications to the Coso Geothermal Field Details Activities (1) Areas (1) Regions (0) Abstract: We describe here efforts in technology development to invert magnetotelluric (MT) data collected in geothermal settings for three-dimensional resistivity models using desktop PC's or small clusters. A finite difference scheme is utilized for the forward problem, with various options to compute the parameter Jacobians, and parameter step estimates are defined using an explicit Gauss-Newton step. The paper

272

Three-dimensional P and S waves velocity structures of the Coso geothermal  

Open Energy Info (EERE)

P and S waves velocity structures of the Coso geothermal P and S waves velocity structures of the Coso geothermal area, California, from microseismic travel time data Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Three-dimensional P and S waves velocity structures of the Coso geothermal area, California, from microseismic travel time data Details Activities (1) Areas (1) Regions (0) Abstract: High precision P and S wave travel times for 2104 microearthquakes with focus <6 km are used in a non-linear inversion to derive high-resolution three-dimensional compressional and shear velocity structures at the Coso Geothermal Area in eastern California. Block size for the inversion is 0.2 km horizontally and 0.5 km vertically and inversions are investigated in the upper 5 km of the geothermal area.

273

Three-Dimensionality in Quasi-Two Dimensional Flows: the Barrel Effects  

E-Print Network [OSTI]

A scenario is put forward for the appearance of three-dimensionality both in quasi-2D rotating flows and quasi-2D magnetohydrodynamic (MHD) flows. We distinguish two forms of threedimensionalities, establish how both are ignited by the presence of walls, and how they relate to each other. One form involves velocities or currents along the rotation direction or the magnetic field, while the other leads to quadratic variations of these quantities along this direction. It is shown that the common tendency of these flows to two-dimensionality and the mechanisms of the first form of three-dimensionality can be explained through a single formal analogy between rotating flows, MHD flows and a wider class of flows, whereas the second form involves a distinct mechanism. Because of this trans-disciplinary character, these phenomena are active in such diverse flows as those in atmospheres, oceans and the cooling blankets of nuclear fusion reactors.

Pothérat, Alban

2011-01-01T23:59:59.000Z

274

Stress, seismicity and structure of shallow oil reservoirs of Clinton County, Kentucky. Final report  

SciTech Connect (OSTI)

Between 1993 and 1995 geophysicists of the Los Alamos National Laboratory, in a project funded by the US Department of Energy, conducted extensive microseismic monitoring of oil production in the recently discovered High Bridge pools of Clinton County and were able to acquire abundant, high-quality data in the northern of the two pools. This investigation provided both three-dimensional spatial and kinetic data relating to the High Bridge fracture system that previously had not been available. Funded in part by the Los Alamos National Laboratory, the Kentucky Geological Survey committed to develop a geological interpretation of these geophysical results, that would be of practical benefit to future oils exploration. This publication is a summary of the results of that project. Contents include the following: introduction; discovery and development; regional geology; fractured reservoir geology; oil migration and entrapment; subsurface stress; induced seismicity; structural geology; references; and appendices.

Hamilton-Smith, T. [Kentucky Geological Survey, Lexington, KY (United States)

1995-12-12T23:59:59.000Z

275

Three-dimensional seismic study of structures and salt tectonics of Eugene Island Area offshore Louisiana, Gulf of Mexico  

E-Print Network [OSTI]

The Eugene Island OCS is one of the largest oil-producing areas in federally owned waters of the U.S. outer continental shelf. Fault development and salt tectonics are the most important structural features of the study area. The study is based...

Xiong, Ye

2012-06-07T23:59:59.000Z

276

Three-dimensional effects of liquid water flooding in the cathode of a PEM fuel cell  

E-Print Network [OSTI]

. Researchers all over the world are focusing on optimizing this system to be cost competitive with energy conversion devices currently available. It is a well known fact that the cathode of the PEM fuel cell is the performance limiting component due...THREE DIMENSIONAL EFFECTS OF LIQUID WATER FLOODING IN THE CATHODE OF A PEM FUEL CELL by Dilip Natarajan and Trung Van Nguyen* Department of Chemical and Petroleum Engineering University of Kansas Lawrence, KS 66045, USA Submitted...

Natarajan, Dilip; Van Nguyen, Trung

2003-03-27T23:59:59.000Z

277

Three-dimensional response of an automobile to a generalized impulse / by John Frederick Bet  

E-Print Network [OSTI]

have not kept pace with the recent up- swing of compact and subcompact vehicle traffic on the highways. Mritten when the predominant vehicle size was larger than the present trends, these standards require examination in light of the smaller..., lighter vehicles. By modifying the highway-vehicle-object simulation model (HVOSM) (3), a three-dimensional computer simulation of signpost impacts is available as a tool to evaluate the standards. In the course of this thesis, validation of the modifi...

Betz, John Frederick

2012-06-07T23:59:59.000Z

278

Volume-scalable high-brightness three-dimensional visible light source  

DOE Patents [OSTI]

A volume-scalable, high-brightness, electrically driven visible light source comprises a three-dimensional photonic crystal (3DPC) comprising one or more direct bandgap semiconductors. The improved light emission performance of the invention is achieved based on the enhancement of radiative emission of light emitters placed inside a 3DPC due to the strong modification of the photonic density-of-states engendered by the 3DPC.

Subramania, Ganapathi; Fischer, Arthur J; Wang, George T; Li, Qiming

2014-02-18T23:59:59.000Z

279

Microcanonical simulation of the site-diluted three-dimensional Ising model  

Science Journals Connector (OSTI)

We use a microcanonical simulation to obtain the phase diagram in the temperature-concentration space of the three-dimensional site-diluted Ising model, for concentrations of magnetic atoms in the range 1?p?0.4. The temperature and concentration dependence of the magnetization, internal energy, and specific heat are calculated on 32×32×32 lattices. The resulting phase diagram agrees well with recent Monte Carlo simulations and extends the numerical estimates up to the regime of strong dilution.

Andréia A. de Alcântara, Adauto J. F. de Souza, and F. G. Brady Moreira

1994-04-01T23:59:59.000Z

280

Three-Dimensional Reconstruction of Porous LSCF Cathodes D. Gostovic,*,z  

E-Print Network [OSTI]

In this initial study the electrochemically active region of a La0.8Sr0.2Co0.2Fe0.8O3- LSCF cathodeThree-Dimensional Reconstruction of Porous LSCF Cathodes D. Gostovic,*,z J. R. Smith,* D. P and heat.1 They consist of three basic layers: cathode, electrolyte, and anode. The cathode is a porous

Florida, University of

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three dimensional magnetism and coupling to conduction electrons in PdCrO2  

SciTech Connect (OSTI)

We report density functional calculations addressing the electronic structure and magnetic properties of delafossite PdCrO{sub 2}. We find substantial magnetic interactions in the c-axis direction as well as beyond first nearest neighbors in-plane, so that PdCrO{sub 2} is a three-dimensional (3D) frustrated antiferromagnet. We also find substantial coupling between the Cr moments and the Pd derived conduction electrons.

Ong, Khuong P [IHPC, Singapore; Singh, David J [ORNL

2012-01-01T23:59:59.000Z

282

A three dimensional corner balance method for spatial discretization of the transport equation  

E-Print Network [OSTI]

(ANS) reactor, currently under development at Oak Ridge National Laboratory (ORNL), is an excellent example of a real reactor with a complicated three-dimensional geometry. At ORNL, transport problems for this reactor have been modeled using TWODANT... reactor could be represented by a 45' slice with reflecting boundaries. We began with an S4 quadrature set to permit comparison against the analyses performed by ORNL. SNAC allows for different quadrature sets in each energy group, and numerical...

Richardson, Rebecca Lynn

1994-01-01T23:59:59.000Z

283

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal  

E-Print Network [OSTI]

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal Ping Kuang,1 opens up a new door for light trapping and near-unity solar absorption over broad s and wide angles://dx.doi.org/10.1364/OL.38.004200 There is a great deal of interest in efficient light trapping in thin film solar

John, Sajeev

284

Unusually Small Electrical Resistance of Three-Dimensional Nanoporous Gold in External Magnetic Fields  

Science Journals Connector (OSTI)

We report the electric conductivity of three-dimensional (3D) nanoporous gold at low temperatures and in strong magnetic fields. It was found that topologically disordered 3D nanoporosity leads to extremely low magnetoresistance and anomalous temperature dependence as the characteristic length of nanoporous gold is tuned to be ?14??nm. This study underscores the importance of 3D topology of a nanostructure on electronic transport properties and has implications in manipulating electron transport by tailoring 3D nanostructures.

T. Fujita; H. Okada; K. Koyama; K. Watanabe; S. Maekawa; M. W. Chen

2008-10-16T23:59:59.000Z

285

Experimental verification of the key properties of a three-dimensional isotropic transmission line based superlens  

E-Print Network [OSTI]

Design and experimental realization of a three-dimensional superlens based on LC-loaded transmission lines are presented. Commercially available components and materials are used in the design. Transmission properties of the designed structure are studied experimentally and the observed lens properties are compared with analytical predictions. Backward-wave propagation and amplification of evanescent waves in the prototype structure are verified both analytically and experimentally.

Pekka Alitalo; Stanislav Maslovski; Sergei Tretyakov

2006-01-10T23:59:59.000Z

286

High-Efficiency Dye-Sensitized Solar Cell with Three-Dimensional Photoanode  

Science Journals Connector (OSTI)

High-Efficiency Dye-Sensitized Solar Cell with Three-Dimensional Photoanode ... Materials Chemistry and Nanochemistry Research Group, Center for Inorganic and Polymeric Nanomaterials, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada ... In addition, he thanks the Natural Sciences and Engineering Research Council (NSERC) of Canada and the NSERC Solar Network for strong and sustained financial support of this work. ...

Nicolas Tétreault; Éric Arsenault; Leo-Philipp Heiniger; Navid Soheilnia; Jérémie Brillet; Thomas Moehl; Shaik Zakeeruddin; Geoffrey A. Ozin; Michael Grätzel

2011-09-30T23:59:59.000Z

287

Three-dimensional reconstruction of the -AlCrFe phase by electron crystallography  

Science Journals Connector (OSTI)

The three-dimensional structure of the huge quasicrystal approxi­mant -AlFeCr was solved by electron crystallography, using high-resolution transmission-electron-microscopy (HREM) images and selected-area electron diffraction patterns from 13 different zone axes. This is the first example of an inorganic structure with over 100 unique atoms being solved to atomic resolution by electron crystallography.

Zou, X.D.

2003-10-28T23:59:59.000Z

288

The ground state energy of the three dimensional Ginzburg-Landau model in the mixed phase  

E-Print Network [OSTI]

We consider the Ginzburg-Landau functional defined over a bounded and smooth three dimensional domain. Supposing that the strength of the applied magnetic field varies between the first and second critical fields, in such a way that $H_{C_1}\\ll H\\ll H_{C_2}$, we estimate the ground state energy to leading order as the Ginzburg-Landau parameter tends to infinity.

Ayman Kachmar

2010-10-10T23:59:59.000Z

289

Three-dimensional Thermal and Airflow (3D-TAF) Model of a Dome-covered  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Three-dimensional Thermal and Airflow (3D-TAF) Model of a Dome-covered Three-dimensional Thermal and Airflow (3D-TAF) Model of a Dome-covered House in Canada Speaker(s): Yaolin Lin Date: October 6, 2009 - 12:00pm Location: 90-3122 A dome-covered house is an example of sustainable design that draws from biological forms in nature. A three-dimensional thermal and air flow (3D-TAF) model was developed to estimate the energy needs of a dome-covered house. This model has two components: a thermal model to calculate the temperature; and an air flow model to find the velocities, which are needed to estimate the surface convection. The two models are solved iteratively at every time step until they converge. I will present the numerical methods for solving the mathematical models, and compared the results with other simulated and experimental results from similar structures. I will

290

Three-dimensional finite-element model for simulating water flow in variability saturated porous media  

SciTech Connect (OSTI)

A three-dimensional finite-element model for simulating water flow in variably saturated porous media is presented. The model formulation is general and capable of accommodating complex boundary conditions associated with seepage faces and infiltration or evaporation on the soil surface. Included in this formulation is an improved Picard algorithm designed to cope with severely nonlinear soil moisture relations. The algorithm is formulated for both rectangular and triangular prism elements. The element matrices are evaluated using an influence coefficient technique that avoids costly numerical integration. Spatial discretization of a three-dimensional regions is performed using a vertical slicing approach designed to accommodate complex geometry with irregular boundaries, layering, and/or lateral discontinuities. Matrix solution is achieved using a slice successive overrelaxation scheme that permits a fairly large number of nodal unknowns (on the order of several thousand) to be handled efficiently on small minicomputers. Six examples are presented to verify and demonstrate the utility of the proposed finite-element model. The first four examples concern one- and two-dimensional flow problems used as sample problems to benchmark the code. The remaining examples concern three-dimensions problems. These problems are used to illustrate the performance of the proposed algorithm in three-dimensional situations involving seepage faces and anisotropic soil media.

Huyakorn, P.S.; Springer, E.P.; Guvanasen, V.; Wadsworth, T.D.

1986-12-01T23:59:59.000Z

291

Weakly collisional Landau damping and three-dimensional Bernstein-Greene-Kruskal modes: New results on old problemsa...  

E-Print Network [OSTI]

Weakly collisional Landau damping and three-dimensional Bernstein-Greene-Kruskal modes: New results February 2006; published online 8 May 2006 Landau damping and Bernstein-Greene-Kruskal BGK modes are among-center approximation . We show, in fact, that two- and three-dimensional solutions that depend only on energy do

Ng, Chung-Sang

292

Domain wall roughening in three dimensional magnets at the depinning transition M. Jost \\Lambda and K. D. Usadel \\Pi  

E-Print Network [OSTI]

Domain wall roughening in three dimensional magnets at the depinning transition M. Jost \\Lambda roughening of a driven interface between three dimensional spin­up and spin­down domains in a model with non to the depinning transition. I. INTRODUCTION A variety of interface roughening models with quenched disorder have

Usadel, K. D.

293

Three-dimensional Josephson-junction arrays: Static magnetic response R. De Luca and T. Di Matteo  

E-Print Network [OSTI]

Three-dimensional Josephson-junction arrays: Static magnetic response R. De Luca and T. Di Matteo Tampere, Finland Received 17 July 1997 In this work we present a simple three-dimensional Josephson-junction directions perpendicular to one cube side. S0163-1829 98 05502-7 I. INTRODUCTION The interest in Josephson-junction

Di Matteo, Tiziana

294

An optical method to quantify the density of ligands for cell adhesion receptors in three-dimensional matrices  

Science Journals Connector (OSTI)

...such models by measuring in situ the...receptors in three-dimensional matrices. The...have used the standard in vitro culture...following. -Measuring the density...2007). -Measuring the density...cells. Three-dimensional matrix environments...removing cells by standard biochemical...

2010-01-01T23:59:59.000Z

295

ABSTRACT FINAL ID: SH51A-1991 TITLE: Three-Dimensional Numerical Simulations of Interaction Between Flux Ropes in the  

E-Print Network [OSTI]

ABSTRACT FINAL ID: SH51A-1991 TITLE: Three-Dimensional Numerical Simulations of Interaction Between, United States. Title of Team: ABSTRACT BODY: We have recently identified in three-dimensional (3D implications in the generation of Alfven waves and MHD turbulence. This work is supported by a NASA grant NNX08

Ng, Chung-Sang

296

THREE DIMENSIONAL INTEGRATED CHARACTERIZATION AND ARCHIVING SYSTEM (3D-ICAS)  

SciTech Connect (OSTI)

The overall objective of this project is to develop an integrated system that remotely characterizes, maps, and archives measurement data of hazardous decontamination and decommissioning (D&D) areas. The system will generate a detailed 3-dimensional topography of the area as well as real-time quantitative measurements of volatile organics and radionuclides. The system will analyze substrate materials consisting of concrete, asbestos, and transite. The system will permanently archive the data measurements for regulatory and data integrity documentation. Exposure limits, rest breaks, and donning and removal of protective garments generate waste in the form of contaminated protective garments and equipment. Survey times are increased and handling and transporting potentially hazardous materials incur additional costs. Off-site laboratory analysis is expensive and time-consuming, often necessitating delay of further activities until results are received. The Three Dimensional Integrated Characterization and Archiving System (3D-ICAS) has been developed to alleviate some of these problems. 3D-ICAS provides a flexible system for physical, chemical and nuclear measurements reduces costs and improves data quality. Operationally, 3D-ICAS performs real-time determinations of hazardous and toxic contamination. A prototype demonstration unit is available for use in early 2000. The tasks in this Phase included: (1) Mobility Platforms: Integrate hardware onto mobility platforms, upgrade surface sensors, develop unit operations and protocol. (2) System Developments: Evaluate metals detection capability using x-ray fluorescence technology. (3) IWOS Upgrades: Upgrade the IWOS software and hardware for compatibility with mobility platform. The system was modified, tested and debugged during 1999 and 2000. The 3D-ICAS was shipped on 11 May 2001 to FIU-HCET for demonstration and validation of the design modifications. These modifications included simplifying the design from a two-vehicle system to a single mobile platform, integration of the XRF sensor for enhanced substrate analysis and upgrading of the IWOS operating system. Several of the system's power supplies were accidentally damaged upon power on because FIU wired 3 phase AC power to the system instead of the requested single phase. Repairs were made in the field to the damaged power supplies but 3 of 5 days time were lost to complete the repairs. Once the repairs were made CyTerra was able to demonstrate the CLR mapping and the movement of the sensor probe to selected locations on the test wall. The XRF sensor was also demonstrated on a stainless steel substrate. A surrogate solution was determined to be below the detection threshold. The radionuclide and GCMS sensors were not demonstrated due to either failed power supply or lack of time remaining in the schedule. The GCMS failure was partially the result of the debugging activities that took place during the week for assessing electrical damage. Specifically, GCMS electronic modules, which control the heating of two of gas transfer elements, may have been damaged during field debugging that was required. Given the financial constraints of the program, CyTerra Corporation decided to return the equipment to Waltham facilities for further assessment. We believe the principles of operation were shown, however a complete demonstration did not occur due to these difficulties.

George Jarvis

2001-06-18T23:59:59.000Z

297

Short-term disturbance by a commercial two-dimensional seismic survey does not lead to long-term displacement of harbour porpoises  

Science Journals Connector (OSTI)

...Broad-band calibration of marine seismic sources used by R/V Polarstern...G. Langseth four-string seismic sources. Geochem. Geophys...AV Soldal. 1996 Effects of seismic shooting on local abundance...Melanogrammus aeglefinus). Can. J. Fish. Aquatic Sci. 53, 2238-2249...

2013-01-01T23:59:59.000Z

298

A 3D-3C Reflection Seismic Survey and Data Integration to Identify the Seismic Response of Fractures and Permeable Zones Over a Known Geothermal Resource at Soda Lake, Churchhill Co., NV  

Broader source: Energy.gov [DOE]

DOE Geothermal Peer Review 2010 - Presentation. Project Summary: Understanding geothermal reservoirs requires multi-discipline, integrated 3D GIS: Access down hole geophysical logs, surface geophysics, isotherms, isoresistivity surfaces, seismic data, cross-sections, etc. instantaneously; Wells tell where youve been; MT shows the direction to go; Seismic provides the map; & Be prepared for discoveries.

299

A Three-Dimensional Picture of the Delayed-Detonation Model of Type Ia Supernovae  

E-Print Network [OSTI]

Deflagration models poorly explain the observed diversity of SNIa. Current multidimensional simulations of SNIa predict a significant amount of, so far unobserved, carbon and oxygen moving at low velocities. It has been proposed that these drawbacks can be resolved if there is a sudden jump to a detonation (delayed detonation), but this kind of models has been explored mainly in one dimension. Here we present new three-dimensional delayed detonation models in which the deflagraton-to-detonation transition (DDT) takes place in conditions like those favored by one-dimensional models. We have used a SPH code adapted to SNIa with algorithms devised to handle subsonic as well as supersonic combustion fronts. The starting point was a C-O white dwarf of 1.38 solar masses. When the average density on the flame surface reached 2-3x10^7 g/cm^3 a detonation was launched. The detonation wave processed more than 0.3 solar masses of carbon and oxygen, emptying the central regions of the ejecta of unburned fuel and raising its kinetic energy close to the fiducial 10^51 ergs expected from a healthy Type Ia supernova. The final amount of 56Ni synthesized also was in the correct range. However, the mass of carbon and oxygen ejected is still too high. The three-dimensional delayed detonation models explored here show an improvement over pure deflagration models, but they still fail to coincide with basic observational constraints. However, there are many aspects of the model that are still poorly known (geometry of flame ignition, mechanism of DDT, properties of detonation waves traversing a mixture of fuel and ashes). Therefore, it will be worth pursuing its exploration to see if a good SNIa model based on the three-dimensional delayed detonation scenario can be obtained.

Eduardo Bravo; Domingo Garcia-Senz

2007-12-04T23:59:59.000Z

300

Sub-nanometer resolution in three-dimensional magnetic-resonance imaging of individual dark spins  

E-Print Network [OSTI]

Magnetic resonance imaging (MRI) has revolutionized biomedical science by providing non-invasive, three-dimensional biological imaging. However, spatial resolution in conventional MRI systems is limited to tens of microns, which is insufficient for imaging on molecular and atomic scales. Here we demonstrate an MRI technique that provides sub-nanometer spatial resolution in three dimensions, with single electron-spin sensitivity. Our imaging method works under ambient conditions and can measure ubiquitous 'dark' spins, which constitute nearly all spin targets of interest and cannot otherwise be individually detected. In this technique, the magnetic quantum-projection noise of dark spins is measured using a single nitrogen-vacancy (NV) magnetometer located near the surface of a diamond chip. The spatial distribution of spins surrounding the NV magnetometer is imaged with a scanning magnetic-field gradient. To evaluate the performance of the NV-MRI technique, we image the three-dimensional landscape of dark electronic spins at and just below the diamond surface and achieve an unprecedented combination of resolution (0.8 nm laterally and 1.5 nm vertically) and single-spin sensitivity. Our measurements uncover previously unidentified electronic spins on the diamond surface, which can potentially be used as resources for improved magnetic imaging of samples proximal to the NV-diamond sensor. This three-dimensional NV-MRI technique is immediately applicable to diverse systems including imaging spin chains, readout of individual spin-based quantum bits, and determining the precise location of spin labels in biological systems.

M. S. Grinolds; M. Warner; K. De Greve; Y. Dovzhenko; L. Thiel; R. L. Walsworth; S. Hong; P. Maletinsky; A. Yacoby

2014-01-12T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Simulations of Failure via Three-Dimensional Cracking in Fuel Cladding for Advanced Nuclear Fuels  

SciTech Connect (OSTI)

Enhancing performance of fuel cladding and duct alloys is a key means of increasing fuel burnup. This project will address the failure of fuel cladding via three-dimensional cracking models. Researchers will develop a simulation code for the failure of the fuel cladding and validate the code through experiments. The objective is to develop an algorithm to determine the failure of fuel cladding in the form of three-dimensional cracking due to prolonged exposure under varying conditions of pressure, temperature, chemical environment, and irradiation. This project encompasses the following tasks: 1. Simulate 3D crack initiation and growth under instantaneous and/or fatigue loads using a new variant of the material point method (MPM); 2. Simulate debonding of the materials in the crack path using cohesive elements, considering normal and shear traction separation laws; 3. Determine the crack propagation path, considering damage of the materials incorporated in the cohesive elements to allow the energy release rate to be minimized; 4. Simulate the three-dimensional fatigue crack growth as a function of loading histories; 5. Verify the simulation code by comparing results to theoretical and numerical studies available in the literature; 6. Conduct experiments to observe the crack path and surface profile in unused fuel cladding and validate against simulation results; and 7. Expand the adaptive mesh refinement infrastructure parallel processing environment to allow adaptive mesh refinement at the 3D crack fronts and adaptive mesh merging in the wake of cracks. Fuel cladding is made of materials such as stainless steels and ferritic steels with added alloying elements, which increase stability and durability under irradiation. As fuel cladding is subjected to water, chemicals, fission gas, pressure, high temperatures, and irradiation while in service, understanding performance is essential. In the fast fuel used in advanced burner reactors, simulations of the nuclear fuels are critical to understand the burnup, and thus the fuel efficiency.

Lu, Hongbing; Bukkapatnam, Satish; Harimkar, Sandip; Singh, Raman; Bardenhagen, Scott

2014-01-09T23:59:59.000Z

302

Seismic stations  

Science Journals Connector (OSTI)

In the previous chapters, the equipment used for seismic stations has been described. When putting this equipment out in the field, we have a seismic station. Unfortunately it is not as simple as just putting ...

Jens Havskov; Gerardo Alguacil

2004-01-01T23:59:59.000Z

303

The critical temperature of two-dimensional and three-dimensional Ising models  

Science Journals Connector (OSTI)

The critical temperatures of the Ising model can be obtained by considering the elementary cells of the corresponding lattice namely the square lattice in two dimensions and the cube in three dimensions. The configurations in the statistical sum of a cell are divided into nondegenerate and degenerate cases. At the critical temperature of the infinite lattice the contributions of these two groups of configurations are assumed to be equal. This conjecture reproduces the exact Onsager result for two dimensions and the numerical result for the three-dimensional Ising lattices. Although this conjecture is not exact it gives insight into the nature of the transitions.

B. Liu; M. Gitterman

2003-01-01T23:59:59.000Z

304

A mathematical model for three dimensional detonation as pure gas-dynamic discontinuity  

E-Print Network [OSTI]

A model for three dimensional detonation is proposed based on the approximation that the detonation thickness is small compared to the characteristic scales of the fluid motion. In this framework detonations are treated as a modified hydrodynamic discontinuity. The altered Rankine-Hugoniot jump conditions take into account the internal structure of the detonation including the chemical reaction. The position of the discontinuity surface and the corresponding jump conditions are derived from first principles. The final modified conditions are dependent on curvature, flame thickness and stretching and allow for simple physical interpretation.

Jorge Yanez Escanciano; Andreas G. Class

2012-09-24T23:59:59.000Z

305

Correlation buildup during recrystallization in three-dimensional dusty plasma clusters  

SciTech Connect (OSTI)

The recrystallization process of finite three-dimensional dust clouds after laser heating is studied experimentally. The time-dependent Coulomb coupling parameter is presented, showing that the recrystallization starts with an exponential cooling phase where cooling is slower than damping by the neutral gas friction. At later times, the coupling parameter oscillates into equilibrium. It is found that a large fraction of cluster states after recrystallization experiments is in metastable states. The temporal evolution of the correlation buildup shows that correlation occurs on even slower time scale than cooling.

Schella, André; Mulsow, Matthias; Melzer, André [Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17489 Greifswald (Germany)] [Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17489 Greifswald (Germany)

2014-05-15T23:59:59.000Z

306

Three-dimensional finite element modeling of a magnet array spinning above a conductor  

SciTech Connect (OSTI)

Drag forces due to eddy currents induced by the relative motion of a conductor and a magnetic field occur in many practical devices: motors, brakes, magnetic bearings, and magnetically levitated vehicles. Recently, finite element codes have included solvers for 3-D eddy current geometries and have the potential to be very useful in the design and analysis of these devices. In this paper, numerical results from three-dimensional modeling of a magnet array spinning above a conductor are compared to experimental results in order to assess the capabilities of these codes.

Lorimer, W.L.; Lieu, D.K. [Univ. of California, Berkeley, CA (United States). Dept. of Mechanical Engineering; Hull, J.R.; Mulcahy, T.M.; Rossing, T.D. [Argonne National Lab., IL (United States)

1993-12-31T23:59:59.000Z

307

Black holes and gravitational waves in three-dimensional f(R) gravity  

E-Print Network [OSTI]

In the three-dimensional pure Einstein gravity, the geometries of the vacuum space-times are always trivial, and gravitational waves (gravitons) are strictly forbidden. For the first time, we find a vacuum circularly symmetric black hole with nontrivial geometries in $f(R)$ gravity theory, in which a true singularity appears. In this frame with nontrivial geometry, a perturbative gravitational wave does exist. Beyond the perturbative level, we make a constructive proof of the existence of a gravitational wave in $f(R)$ gravity, where the Birkhoff-like theorem becomes invalid. We find two classes of exact solutions of circularly symmetric pure gravitational wave radiation and absorption.

Hongsheng Zhang; Dao-Jun Liu; Xin-Zhou Li

2014-12-19T23:59:59.000Z

308

Photonic band gaps in three-dimensional network structures with short-range order  

SciTech Connect (OSTI)

We present a systematic study of photonic band gaps (PBGs) in three-dimensional (3D) photonic amorphous structures (PASs) with short-range order. From calculations of the density of optical states (DOS) for PASs with different topologies, we find that tetrahedrally connected dielectric networks produce the largest isotropic PBGs. Local uniformity and tetrahedral order are essential to the formation of PBGs in PASs, in addition to short-range geometric order. This work demonstrates that it is possible to create broad, isotropic PBGs for vector light fields in 3D PASs without long-range order.

Liew, Seng Fatt; Noh, Heeso [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Yang, Jin-Kyu [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Optical Engineering, Kongju National University, Kongju 314-701 (Korea, Republic of); Schreck, Carl F. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Dufresne, Eric R. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511 (United States); Department of Cell Biology, Yale University, New Haven, Connecticut 06511 (United States); O'Hern, Corey S. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Cao, Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Physics, Yale University, New Haven, Connecticut 06511 (United States)

2011-12-15T23:59:59.000Z

309

Note: Design and development of an integrated three-dimensional scanner for atomic force microscopy  

SciTech Connect (OSTI)

A compact scanning head for the Atomic Force Microscope (AFM) greatly enhances the portability of AFM and facilitates easy integration with other tools. This paper reports the design and development of a three-dimensional (3D) scanner integrated into an AFM micro-probe. The scanner is realized by means of a novel design for the AFM probe along with a magnetic actuation system. The integrated scanner, the actuation system, and their associated mechanical mounts are fabricated and evaluated. The experimentally calibrated actuation ranges are shown to be over 1 ?m along all the three axes.

Rashmi, T.; Dharsana, G.; Sriramshankar, R.; Sri Muthu Mrinalini, R.; Jayanth, G. R. [Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012 (India)] [Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012 (India)

2013-11-15T23:59:59.000Z

310

All-dielectric three-dimensional broadband Eaton lens with large refractive index range  

SciTech Connect (OSTI)

We proposed a method to realize three-dimensional (3D) gradient index (GRIN) devices requiring large refractive index (RI) range with broadband performance. By combining non-resonant GRIN woodpile photonic crystals structure in the metamaterial regime with a compound liquid medium, a wide RI range (1–6.32) was fulfilled flexibly. As a proof-of-principle for the low-loss and non-dispersive method, a 3D Eaton lens was designed and fabricated based on 3D printing process. Full-wave simulation and experiment validated its omnidirectional wave bending effects in a broad bandwidth covering Ku band (12?GHz–18?GHz)

Yin, Ming; Yong Tian, Xiao, E-mail: leoxyt@mail.xjtu.edu.cn; Ling Wu, Ling; Chen Li, Di [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)

2014-03-03T23:59:59.000Z

311

Effective three-dimensional superhydrophobic aerogel-coated channel for high efficiency water-droplet transport  

Science Journals Connector (OSTI)

Three-dimensional superhydrophobic surfaces have been used effectively to optimize droplet transport efficiency in diverse fluidic systems. However the fabrication methods for superhydrophobic surfaces applicable to fluidic devices usually involve complicated process. Herein we report a simple but effective method of fabricating a superhydrophobic surface using organically modified silica aerogel. Superhydrophobic aerogel thin film having highly porous micro/nanostructured surface with methyl groups was realized inside a 3D channel by coating it. To demonstrate that the aerogel-coated surface effectively facilitates movement of water droplets the droplet-based flow characteristics regarding the triple line were conducted.

Hyungmo Kim; Joonwon Kim

2014-01-01T23:59:59.000Z

312

Subwavelength resolution with three-dimensional isotropic transmission-line lenses  

E-Print Network [OSTI]

Dispersion, impedance matching and resolution characteristics of an isotropic three-dimensional flat lens ("superlens") are studied. The lens is based on cubic meshes of interconnected transmission lines and bulk loads. We study a practical realization of the lens, based on the microstrip technology. The dispersion equations that have been previously derived, are verified with full-wave simulations. The isotropy of the structure is verified with analytical as well as simulation results. The resolution characteristics of a practically realizable, lossy lens are studied analytically.

Pekka Alitalo; Sergei Tretyakov

2007-03-09T23:59:59.000Z

313

Impact fracture of a three-dimensional cube with quenched disorder  

Science Journals Connector (OSTI)

Disorder is demonstrated to be a decisive factor that controls the location and the amount of damage caused by a rapid impact on a three-dimensional elastic solid. For strong disorder, the damage is localized close to the point of impact, while for weak disorder, constructive interference leads to fracture in the vicinity of the face opposite to the impact. Dynamical overload seems to hinder the formation of self-affine crack structures. However, the crack surface becomes more rough as the quasistatic limit is approached.

Jan Åström and Jussi Timonen

1999-04-01T23:59:59.000Z

314

Investigation of the singular integral and discontinuous traction problems for boundary element three-dimensional elastostatics  

E-Print Network [OSTI]

point. Up to six sub-cells may be required to perform the integration over the complete volume. Integration over each sub-cell is performed by mapping the sub-cell onto a cube in intrinsic coordinates ( q , h , t) ). This technique of evaluating... to two and three-dimensional boundary elements, where the mapping of the pyramidal 10 sub-cell onto a cube translates to the mapping of a triangular element onto a quadrangle in instrinsic coordinates. This transformation has the effect of blowing up...

Awad, Nadim Mansour

2012-06-07T23:59:59.000Z

315

Testing and benchmarking of a three-dimensional groundwater flow and solute transport model  

SciTech Connect (OSTI)

A three-dimensional finite-difference model was developed to simulate groundwater flow and solute transport. The model is intended for application to a variety of groundwater resource and solute migration evaluations, including several complex sites at the Savannah River Plant (SRP). Because the model, FTWORK, is relatively new, there is a need to provide confidence in the model results. Methodologies that test models include comparisons with analytical solutions, comparisons with empirical data, and checking that conservation properties hold. Another level of testing is the comparison of one code against another. This paper describes the testing and benchmarking procedure used to verify the validate FTWORK.

Sims, P.N.; Andersen, P.F.; Faust, C.R. [GeoTrans, Inc., Herndon, VA (United States); Stephenson, D.E. [E.I. DuPont de Nemours and Co., Aiken, SC (United States)

1988-12-31T23:59:59.000Z

316

FTWORK: A three-dimensional groundwater flow and solute transport code  

SciTech Connect (OSTI)

The three-dimensional, finite-difference model, FTWORK, may be used to simulate groundwater flow and solute transport processes in fully saturated porous media. The model solves the flow and transport equations separately. Transport mechanisms considered include: advection, hydrodynamic dispersion, adsorption, and radioactive decay. This version of FTWORK also provides for parameter estimation of the steady-state flow applications. Also included in this version is a subroutine that allows linkage with a particle tracking program, GEOTRACK. 20 refs., 51 figs., 31 tabs.

Faust, C.R.; Sims, P.N.; Spalding, C.P.; Andersen, P.F. (GeoTrans, Inc., Herndon, VA (USA)); Stephenson, D.E. (Westinghouse Savannah River Co., Aiken, SC (USA))

1990-01-01T23:59:59.000Z

317

Impact of the number of registration points for replacement of three-dimensional computed tomography images in dental areas using three-dimensional light-scanned images of dental models  

Science Journals Connector (OSTI)

The aim of this study was to investigate the accuracy and reliability of registration methods for replacing dental areas of three-dimensional (3D) computed tomography (CT) images with 3D light-scanned dental i...

Young-Su Choi; Moon-Key Kim; Jae-Won Lee; Sang-Hoon Kang

2014-01-01T23:59:59.000Z

318

Tracker: A three-dimensional raytracing program for ionospheric radio propagation  

SciTech Connect (OSTI)

TRACKER is an extension of a three-dimensional Hamiltonian raytrace code developed some thirty years ago by R. Michael Jones. Subsequent modifications to this code, which is commonly called the {open_quotes}Jones Code,{close_quotes} were documented by Jones and Stephensen (1975). TRACKER incorporates an interactive user`s interface, modern differential equation integrators, graphical outputs, homing algorithms, and the Ionospheric Conductivity and Electron Density (ICED) ionosphere. TRACKER predicts the three-dimensional paths of radio waves through model ionospheres by numerically integrating Hamilton`s equations, which are a differential expression of Fermat`s principle of least time. By using continuous models, the Hamiltonian method avoids false caustics and discontinuous raypath properties often encountered in other raytracing methods. In addition to computing the raypath, TRACKER also calculates the group path (or pulse travel time), the phase path, the geometrical (or {open_quotes}real{close_quotes}) pathlength, and the Doppler shift (if the time variation of the ionosphere is explicitly included). Computational speed can be traded for accuracy by specifying the maximum allowable integration error per step in the integration. Only geometrical optics are included in the main raytrace code; no partial reflections or diffraction effects are taken into account. In addition, TRACKER does not lend itself to statistical descriptions of propagation -- it requires a deterministic model of the ionosphere.

Argo, P.E.; DeLapp, D.; Sutherland, C.D.; Farrer, R.G.

1994-12-01T23:59:59.000Z

319

Scalable three-dimensional thermal-hydraulic best-estimate code BAGIRA  

SciTech Connect (OSTI)

The three-dimensional thermal-hydraulic best-estimate code BAGIRA for modeling of multi-phase flows was developed without any artificial physical assumptions or simplifications. The mathematical model is based on numerical approximations of exact three-dimensional equations, including effective multi-dimensional models for turbulent heat and mass transfer. With use of BAGIRA All-Russian Scientific Research Inst. of Nuclear Power Plants (VNIIAES) has developed a full-scope and analytical simulators using BAGIRA for a number of power plants with VVER-1000 and RBMK type design, which are being used in Kalinin, Kursk, Smolensk, Chernobyl, and Bilibino NPPs. The comparison of calculated and experimental results shows that BAGIRA can successfully reproduce the most important processes observed in experiments. BAGIRA is implemented in FORTRAN. It is a relatively complicated code that tends to decompose task by aspects. Such a style is welcoming for extensions, which can be added without code redesign. We would like to present an aspect-oriented mix-in approach for BAGIRA code extension. It allows to make it scalable in number of directions leaving original code base untouched. It is possible to add new effects/units, and even to produce a supercomputer version of the code. The last is a key point today due to availability of low-cost compact supercomputers, which makes building compact NPP simulators possible. (authors)

Vasenin, V. A.; Krivchikov, M. A. [Moscow State Univ., Moscow (Russian Federation); Kroshilin, V. E.; Kroshilin, A. E.; Roganov, V. A. [All-Russian Scientific Research Inst. of Nuclear Power Plants (VNIIAES), Ferganskaya 25, Moscow (Russian Federation)

2012-07-01T23:59:59.000Z

320

A MATLAB Code for Three Dimensional Linear Elastostatics using Constant Boundary Elements  

E-Print Network [OSTI]

Present work presents a code written in the very simple programming language MATLAB, for three dimensional linear elastostatics, using constant boundary elements. The code, in full or in part, is not a translation or a copy of any of the existing codes. Present paper explains how the code is written, and lists all the formulae used. Code is verified by using the code to solve a simple problem which has the well known approximate analytical solution. Of course, present work does not make any contribution to research on boundary elements, in terms of theory. But the work is justified by the fact that, to the best of author's knowledge, as of now, one cannot find an open access MATLAB code for three dimensional linear elastostatics using constant boundary elements. Author hopes this paper to be of help to beginners who wish to understand how a simple but complete boundary element code works, so that they can build upon and modify the present open access code to solve complex engineering problems quickly and easi...

P, Kirana Kumara

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Sulfur/three-dimensional graphene composite for high performance lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract A sulfur/graphene composite is prepared by loading elemental sulfur into three-dimensional graphene (3D graphene), which is assembled using a metal ions assisted hydrothermal method. When used as cathode materials for lithium–sulfur (Li–S) batteries, the sulfur/graphene composite (S@3D-graphene) with 73 wt % sulfur shows a significantly enhanced cycling performance (>700 mAh g?1 after 100 cycles at 0.1C rate with a Coulombic efficiency > 96%) as well as high rate capability with a capacity up to 500 mAh g?1 at 2C rate (3.35 A g?1). The superior electrochemical performance could be attributed to the highly porous structure of three-dimensional graphene that not only enables stable and continue pathway for rapid electron and ion transportation, but also restrain soluble polysulfides and suppress the “shuttle effect”. Moreover, the robust structure of 3D graphene can keep cathode integrity and accommodate the volume change during high-rate charge/discharge processes, making it a promising candidate as cathode for high performance Li–S batteries.

Chunmei Xu; Yishan Wu; Xuyang Zhao; Xiuli Wang; Gaohui Du; Jun Zhang; Jiangping Tu

2015-01-01T23:59:59.000Z

322

Fully Three-dimensional Simulation and Modeling of a Dense Plasma Focus  

E-Print Network [OSTI]

A Dense Plasma Focus (DPF) is a pulsed-power machine that electromagnetically accelerates and cylindrically compresses a shocked plasma in a Z-pinch. The pinch results in a brief (about 100 nanosecond) pulse of X-rays, and, for some working gases, also a pulse of neutrons. A great deal of experimental research has been done into the physics of DPF reactions, and there exist mathematical models describing its behavior during the different time phases of the reaction. Two of the phases, known as the inverse pinch and the rundown, are approximately governed by magnetohydrodynamics, and there are a number of well-established codes for simulating these phases in two dimensions or in three dimensions under the assumption of axial symmetry. There has been little success, however, in developing fully three-dimensional simulations. In this work we present three-dimensional simulations of DPF reactions and demonstrate that 3D simulations predict qualitatively and quantitatively different behavior than their 2D counterp...

Meehan, B T

2014-01-01T23:59:59.000Z

323

Image system for three dimensional, 360{degree}, time sequence surface mapping of moving objects  

DOE Patents [OSTI]

A three-dimensional motion camera system comprises a light projector placed between two synchronous video cameras all focused on an object-of-interest. The light projector shines a sharp pattern of vertical lines (Ronchi ruling) on the object-of-interest that appear to be bent differently to each camera by virtue of the surface shape of the object-of-interest and the relative geometry of the cameras, light projector and object-of-interest. Each video frame is captured in a computer memory and analyzed. Since the relative geometry is known and the system pre-calibrated, the unknown three-dimensional shape of the object-of-interest can be solved for by matching the intersections of the projected light lines with orthogonal epipolar lines corresponding to horizontal rows in the video camera frames. A surface reconstruction is made and displayed on a monitor screen. For 360{degree} all around coverage of the object-of-interest, two additional sets of light projectors and corresponding cameras are distributed about 120{degree} apart from one another. 20 figs.

Lu, S.Y.

1998-12-22T23:59:59.000Z

324

Image system for three dimensional, 360 DEGREE, time sequence surface mapping of moving objects  

DOE Patents [OSTI]

A three-dimensional motion camera system comprises a light projector placed between two synchronous video cameras all focused on an object-of-interest. The light projector shines a sharp pattern of vertical lines (Ronchi ruling) on the object-of-interest that appear to be bent differently to each camera by virtue of the surface shape of the object-of-interest and the relative geometry of the cameras, light projector and object-of-interest Each video frame is captured in a computer memory and analyzed. Since the relative geometry is known and the system pre-calibrated, the unknown three-dimensional shape of the object-of-interest can be solved for by matching the intersections of the projected light lines with orthogonal epipolar lines corresponding to horizontal rows in the video camera frames. A surface reconstruction is made and displayed on a monitor screen. For 360.degree. all around coverage of theobject-of-interest, two additional sets of light projectors and corresponding cameras are distributed about 120.degree. apart from one another.

Lu, Shin-Yee (Pleasanton, CA)

1998-01-01T23:59:59.000Z

325

Three-dimensional structure of the flow inside the left ventricle of the human heart  

E-Print Network [OSTI]

The laboratory models of the human heart left ventricle developed in the last decades gave a valuable contribution to the comprehension of the role of the fluid dynamics in the cardiac function and to support the interpretation of the data obtained in vivo. Nevertheless, some questions are still open and new ones stem from the continuous improvements in the diagnostic imaging techniques. Many of these unresolved issues are related to the three-dimensional structure of the left-ventricular flow during the cardiac cycle. In this paper we investigated in detail this aspect using a laboratory model. The ventricle was simulated by a flexible sack varying its volume in time according to a physiologically shaped law. Velocities measured during several cycles on series of parallel planes, taken from two orthogonal points of view, were combined together in order to reconstruct the phase averaged, three-dimensional velocity field. During the diastole, three main steps are recognized in the evolution of the vortical str...

Fortini, S; Espa, S; Cenedese, A

2014-01-01T23:59:59.000Z

326

Controlled synthesis of hyper-branched inorganic nanocrystals withrich three-dimensional structures  

SciTech Connect (OSTI)

Studies of crystal growth kinetics are tightly integrated with advances in the creation of new nanoscale inorganic building blocks and their functional assemblies 1-11. Recent examples include the development of semiconductor nanorods which have potential uses in solar cells 12-17, and the discovery of a light driven process to create noble metal particles with sharp corners that can be used in plasmonics 18,19. In the course of studying basic crystal growth kinetics we developed a process for preparing branched semiconductor nanocrystals such as tetrapods and inorganic dendrimers of precisely controlled generation 20,21. Here we report the discovery of a crystal growth kinetics regime in which a new class of hyper-branched nanocrystals are formed. The shapes range from 'thorny balls', to tree-like ramified structures, to delicate 'spider net'-like particles. These intricate shapes depend crucially on a delicate balance of branching and extension. The multitudes of resulting shapes recall the diverse shapes of snowflakes 22.The three dimensional nature of the branch points here, however, lead to even more complex arrangements than the two dimensionally branched structures observed in ice. These hyper-branched particles not only extend the available three-dimensional shapes in nanoparticle synthesis ,but also provide a tool to study growth kinetics by carefully observing and modeling particle morphology.

Kanaras, Antonios G.; Sonnichsen, Carsten; Liu, Haitao; Alivisatos, A. Paul

2005-07-27T23:59:59.000Z

327

Structure of potato calmodulin PCM6: the first report of the three-dimensional structure of a plant calmodulin  

Science Journals Connector (OSTI)

The PCM6 structure provides the first three-dimensional structure of a plant calmodulin and shows differences from animal and protozoa calmodulin structures in its crystal form, central helix conformation and molecular-surface properties.

Yun, C.-H.

2004-06-22T23:59:59.000Z

328

Potential applications of three-dimensional geoscientific mapping and modeling systems to regional hydrogeological assessments at Yucca mountain, Nevada  

Science Journals Connector (OSTI)

Three-dimensional Geoscientific Information Systems (GSIS) are being evaluated for supporting 3-D ground-water modeling activities required to evaluate the paleo-, present, and future hydrology at Yucca Mountain,...

A. Keith Turner; Kenneth E. Kolm

1992-01-01T23:59:59.000Z

329

Area-Average Solar Radiative Transfer in Three-Dimensionally Inhomogeneous Clouds: The Independently Scattering Cloudlet Model  

Science Journals Connector (OSTI)

A new conceptual and computational basis is described for renormalizing the single-scatter and extinction properties (optical depth, single-scatter albedo, and scattering phase function or asymmetry parameter) of a three-dimensionally ...

Grant W. Petty

2002-10-01T23:59:59.000Z

330

Tropical Cyclone Initialization with a Spherical High-Order Filter and an Idealized Three-Dimensional Bogus Vortex  

Science Journals Connector (OSTI)

A tropical cyclone initialization method with an idealized three-dimensional bogus vortex of an analytic empirical formula is presented for the track and intensity prediction. The procedure in the new method consists of four steps: the separation ...

In-Hyuk Kwon; Hyeong-Bin Cheong

2010-04-01T23:59:59.000Z

331

An updatable three-dimensional display via direct optical fringe writing of computer - generated holographic stereograms in photorefractive polymer  

E-Print Network [OSTI]

This thesis aims to assess the feasibility of an updatable three-dimensional display based on the direct fringe writing of computer-generated holographic gratings into a novel photorefractive polymer. The photorefractive ...

Jolly, Sundeep (Sundeep Kumar)

2012-01-01T23:59:59.000Z

332

Three-dimensional reconstruction of bubble distribution in two-phase bubbly flows with the dynamic programming method  

E-Print Network [OSTI]

A three-dimensional bubble reconstruction method is proposed in this thesis to analyze two-phase bubbly flows. Gas/liquid two-phase flows have important roles in the nuclear and chemical industries and other engineering fields...

Furukawa, Toru

2002-01-01T23:59:59.000Z

333

Dense, low-power sensor network for three-dimensional thermal characterization of large-scale atria spaces  

E-Print Network [OSTI]

We describe the design and implementation of a dense, low-power wireless sensor network for fine-grained three-dimensional thermal characterization of a large open indoor space. To better understand the airflow dynamics ...

Gong, Nan-Wei

334

Effect of the Hadley Circulation on the Reflection of Planetary Waves in Three-Dimensional Tropospheric Flows  

Science Journals Connector (OSTI)

The nonlinear behavior of quasi-stationary planetary waves excited by midlatitude orographic forcing is considered in a three-dimensional primitive equation model that includes a representation of the Hadley circulation. The Hadley circulation is ...

Christopher C. Walker; Gudrun Magnusdottir

2002-10-01T23:59:59.000Z

335

Seismic Mapping Of The Subsurface Structure At The Ryepatch Geothermal...  

Open Energy Info (EERE)

In 1998 a 3-D surface seismic survey was conducted to explore the structure of the Rye Patch geothermal reservoir (Nevada) to determine if modern seismic techniques could be...

336

The computation of three-dimensional systems with various turbulence model variations  

SciTech Connect (OSTI)

The standard {kappa}-{epsilon} equations and other turbulence corrections are evaluated and reported with respect to their applicability in three-dimensional flows. The turbulence models are formulated on the assumption that an isotropic eddy viscosity and the modified Boussinesq hypothesis adequately describe the stress distributions, and that the source of predictive error is a consequence of the modeled terms in the {kappa}-{epsilon} equations. Turbulence model corrections are incorporated to investigate their impact on these errors. Predictions from various turbulence models are compared with experimental data from an isothermal 3-D configuration. The data comparisons delineate the relative advantages and disadvantages of various modifications. The {kappa}-{epsilon} model performs competitively with other model corrections and in some instances is judged to be superior than the modified treatments. However, given the additional computational time and the marginal superiority of the investigated models, it is recommended that present 3-D computational code calculations retain the standard {kappa}-{epsilon} model.

Hassan, M.A. [Cairo Univ., Giza (Egypt). Mechanical Power Engineering Dept.

1996-12-31T23:59:59.000Z

337

Two-dimensional excitons in three-dimensional hexagonal boron nitride  

SciTech Connect (OSTI)

The recombination processes of excitons in hexagonal boron nitride (hBN) have been probed using time-resolved photoluminescence. It was found that the theory for two-dimensional (2D) exciton recombination describes well the exciton dynamics in three-dimensional hBN. The exciton Bohr radius and binding energy deduced from the temperature dependent exciton recombination lifetime is around 8?Å and 740?meV, respectively. The effective masses of electrons and holes in 2D hBN deduced from the generalized relativistic dispersion relation of 2D systems are 0.54m{sub o}, which are remarkably consistent with the exciton reduced mass deduced from the experimental data. Our results illustrate that hBN represents an ideal platform to study the 2D optical properties as well as the relativistic properties of particles in a condensed matter system.

Cao, X. K.; Lin, J. Y., E-mail: hx.jiang@ttu.edu; Jiang, H. X., E-mail: jingyu.lin@ttu.edu [Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409 (United States); Clubine, B.; Edgar, J. H. [Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506 (United States)] [Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506 (United States)

2013-11-04T23:59:59.000Z

338

Method to planarize three-dimensional structures to enable conformal electrodes  

DOE Patents [OSTI]

Methods for fabricating three-dimensional PIN structures having conformal electrodes are provided, as well as the structures themselves. The structures include a first layer and an array of pillars with cavity regions between the pillars. A first end of each pillar is in contact with the first layer. A segment is formed on the second end of each pillar. The cavity regions are filled with a fill material, which may be a functional material such as a neutron sensitive material. The fill material covers each segment. A portion of the fill material is etched back to produce an exposed portion of the segment. A first electrode is deposited onto the fill material and each exposed segment, thereby forming a conductive layer that provides a common contact to each the exposed segment. A second electrode is deposited onto the first layer.

Nikolic, Rebecca J; Conway, Adam M; Graff, Robert T; Reinhardt, Catherine; Voss, Lars F; Shao, Qinghui

2012-11-20T23:59:59.000Z

339

Development and validation of a two-phase, three-dimensional model for PEM fuel cells.  

SciTech Connect (OSTI)

The objectives of this presentation are: (1) To develop and validate a two-phase, three-dimensional transport modelfor simulating PEM fuel cell performance under a wide range of operating conditions; (2) To apply the validated PEM fuel cell model to improve fundamental understanding of key phenomena involved and to identify rate-limiting steps and develop recommendations for improvements so as to accelerate the commercialization of fuel cell technology; (3) The validated PEMFC model can be employed to improve and optimize PEM fuel cell operation. Consequently, the project helps: (i) address the technical barriers on performance, cost, and durability; and (ii) achieve DOE's near-term technical targets on performance, cost, and durability in automotive and stationary applications.

Chen, Ken Shuang

2010-04-01T23:59:59.000Z

340

Current Singularities at Quasi-Separatrix Layers and Three-Dimensional Magnetic Nulls  

E-Print Network [OSTI]

The open problem of how singular current structures form in line-tied, three-dimensional magnetic fields is addressed. A Lagrangian magneto-frictional relaxation method is employed to model the field evolution towards the final near-singular state. Our starting point is an exact force-free solution of the governing magnetohydrodynamic (MHD) equations which is sufficiently general to allow for topological features like magnetic nulls to be inside or outside the computational domain, depending on a simple set of parameters. Quasi-separatrix layers (QSLs) are present in these structures and together with the magnetic nulls, they significantly influence the accumulation of current. It is shown that perturbations affecting the lateral boundaries of the configuration lead not only to collapse around the magnetic null, but also to significant QSL currents. Our results show that once a magnetic null is present, the developing currents are always attracted to that specific location and show a much stronger scaling wit...

Craig, I J D

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-dimensional simulations of cellular non-premixed jet flames  

SciTech Connect (OSTI)

The formation, dynamics and structure of cellular flames in circular non-premixed jets are examined with three-dimensional numerical simulations incorporating detailed descriptions of chemistry and transport. Similar to past experiments reported in the literature, CO{sub 2}-diluted hydrogen in diluted or pure oxygen co-flowing streams in the proximity of the extinction limit are considered. As in the experiments, several preferred cellular states are found to co-exist with the particular state realized depending on initial conditions as well as on the jet characteristics. The simulations provide additionally the temporal transitions to different stationary or rotating cellular flames, their detailed structure, and the dependence of the scaling of the realized number of cells with the vorticity thickness. (author)

Valaer, A.L.; Frouzakis, C.E.; Boulouchos, K. [Aerothermochemistry and Combustion System Laboratory, Swiss Federal Institute of Technology, CH-8092 Zurich (Switzerland); Papas, P. [Division of Engineering, Colorado School of Mines, Golden, CO 80401 (United States); Tomboulides, A.G. [Department of Engineering and Management of Energy Resources, University of Western Macedonia, 50100 Kozani (Greece)

2010-04-15T23:59:59.000Z

342

Fluid breakup during simultaneous two-phase flow through a three-dimensional porous medium  

E-Print Network [OSTI]

We use confocal microscopy to directly visualize the simultaneous flow of both a wetting and a non-wetting fluid through a model three-dimensional (3D) porous medium. We find that, for small flow rates, both fluids flow through unchanging, distinct, connected 3D pathways; in stark contrast, at sufficiently large flow rates, the non-wetting fluid is broken up into discrete ganglia. By performing experiments over a range of flow rates, using fluids of different viscosities, and with porous media having different geometries, we show that this transition can be characterized by a state diagram that depends on the capillary numbers of both fluids, suggesting that it is controlled by the competition between the viscous forces exerted on the flowing oil and the capillary forces at the pore scale. Our results thus help elucidate the diverse range of behaviors that arise in two-phase flow through a 3D porous medium.

Sujit S. Datta; Jean-Baptiste Dupin; David A. Weitz

2014-06-26T23:59:59.000Z

343

Three-dimensional photodissociation in strong laser fields: Memory-kernel effective-mode expansion  

SciTech Connect (OSTI)

We introduce a method for the efficient computation of non-Markovian quantum dynamics for strong (and time-dependent) system-bath interactions. The past history of the system dynamics is incorporated by expanding the memory kernel in exponential functions thereby transforming in an exact fashion the non-Markovian integrodifferential equations into a (larger) set of ''effective modes'' differential equations (EMDE). We have devised a method which easily diagonalizes the EMDE, thereby allowing for the efficient construction of an adiabatic basis and the fast propagation of the EMDE in time. We have applied this method to three-dimensional photodissociation of the H{sub 2}{sup +} molecule by strong laser fields. Our calculations properly include resonance-Raman scattering via the continuum, resulting in extensive rotational and vibrational excitations. The calculated final kinetic and angular distribution of the photofragments are in overall excellent agreement with experiments, both when transform-limited pulses and when chirped pulses are used.

Li Xuan [Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z3 (Canada); Thanopulos, Ioannis [Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens 11635 (Greece); Shapiro, Moshe [Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z3 (Canada); Department of Chemical Physics, Weizmann Institute, Rehovot 76100 (Israel)

2011-03-15T23:59:59.000Z

344

Three-Dimensional Aberration-Corrected Scanning Transmission Electron Microscopy for Biology  

SciTech Connect (OSTI)

Recent instrumental developments have enabled greatly improved resolution of scanning transmission electron microscopes (STEM) through aberration correction. An additional and previously unanticipated advantage of aberration correction is the greatly improved depth sensitivity that has led to the reconstruction of a three-dimensional (3D) image from a focal series. In this chapter the potential of aberration-corrected 3D STEM to provide major improvements in the imaging capabilities for biological samples will be discussed. This chapter contains a brief overview ofthe various high-resolution 3D imaging techniques, a historical perspective of the development of STEM, first estimates of the dose-limited axial and lateral resolution on biological samples and initial experiments on stained thin sections.

De Jonge, Niels [ORNL; Sougrat, Rachid [ORNL; Pennycook, Stephen J [ORNL; Peckys, Diana B [ORNL; Lupini, Andrew R [ORNL

2007-01-01T23:59:59.000Z

345

Three dimensional complex plasma structures in a combined radio frequency and direct current discharge  

SciTech Connect (OSTI)

We report on the first detailed analysis of large three dimensional (3D) complex plasma structures in experiments performed in pure rf and combined rf+dc discharge modes. Inductively coupled plasma is generated by an rf coil wrapped around the vertically positioned cylindrical glass tube at a pressure of 0.3 mbar. In addition, dc plasma can be generated by applying voltage to the electrodes at the ends of the tube far from the rf coil. The injected monodisperse particles are levitated in the plasma below the coil. A scanning laser sheet and a high resolution camera are used to determine the 3D positions of about 10{sup 5} particles. The observed bowl-shaped particle clouds reveal coexistence of various structures, including well-distinguished solid-like, less ordered liquid-like, and pronounced string-like phases. New criteria to identify string-like structures are proposed.

Mitic, S.; Morfill, G. E. [Max-Planck-Institut fuer extraterrestrische Physik, D-85741 Garching (Germany); Klumov, B. A. [Joint Institute for High Temperatures, Moscow 125412 (Russian Federation); Khrapak, S. A. [Max-Planck-Institut fuer extraterrestrische Physik, D-85741 Garching (Germany); Joint Institute for High Temperatures, Moscow 125412 (Russian Federation)

2013-04-15T23:59:59.000Z

346

Three-dimensional shock-shock interactions on the scramjet inlet  

SciTech Connect (OSTI)

The effects of shock impingement on the inlet of a scramjet engine are investigated numerically. The impinging shock is caused by the vehicle forebody. The interaction of this forebody shock with the inlet leading edge shock results in a very complex fully three-dimensional flowfield containing local regions of high pressure and intense heating. In the present investigation, this complex flowfield is calculated by solving the thin-layer Navier-Stokes equations using a finite-volume flux splitting technique due to van Leer. For zero or small sweep angles a Type IV interaction occurs while for moderate sweep of about 25 deg, a Type V interaction occurs. Both Type IV and Type V interactions are investigated. 25 refs.

Singh, D.J.; Tiwari, S.N.; Kumar, A.

1990-01-01T23:59:59.000Z

347

Design and development of the associated-particle three-dimensional imaging technique  

SciTech Connect (OSTI)

The authors describe the development of the ``associated-particle`` imaging technique for producing low-resolution three-dimensional images of objects. Based on the t(d,n){sup 4}He reaction, the method requires access to only one side of the object being imaged and allows for the imaging of individual chemical elements in the material under observation. Studies were performed to (1) select the appropriate components of the system, including detectors, data-acquisition electronics, and neutron source, and (2) optimize experimental methods for collection and presentation of data. This report describes some of the development steps involved and provides a description of the complete final system that was developed.

Ussery, L.E.; Hollas, C.L.

1994-10-01T23:59:59.000Z

348

Three-dimensional antenna coupling to core plasma in fusion devices  

SciTech Connect (OSTI)

A complete understanding of the RF physics from the launcher to the plasma core is required to fully analyze RF experiments and to evaluate the performance of RF antenna designs in ITER. This understanding requires a consistent model for the RF power launching system, propagation and absorption through the edge region, and the response of the core plasma to the RF power. As a first step toward such a model, the three-dimensional (3D) antenna modeling code, RANT3D, has been coupled with the reduced order full wave code, PICES. Preliminary results from this model are presented in this paper for parameters similar to those found in the DIII-D experiment.

Carter, M.D.; Jaeger, E.F.; Stallings, D.C.; Galambos, J.D.; Batchelor, D.B.; Wang, C.Y.

1995-09-01T23:59:59.000Z

349

Three-dimensional Chemical Imaging of Embedded Nanoparticles using Atom Probe Tomography  

SciTech Connect (OSTI)

Analysis of nanoparticles is often challenging especially when they are embedded in a matrix. Hence, we have used laser-assisted atom probe tomography (APT) to analyze the Au-nanoclusters synthesized in situ using ion beam implantation in single crystal MgO matrix. APT analysis along with scanning transmission electron microscopy and energy dispersive spectroscopy (STEM-EDS) indicated that the nanoparticles have an average size ~ 8 - 12 nm. While it is difficult to analyze the composition of individual nanoparticles using STEM, APT analysis can give three dimensional compositions of the same. It was shown that the maximum Au-concentration in the nanoparticles increases with increasing particle size, with a maximum Au-concentration of up to 50%.

Kuchibhatla, Satyanarayana V N T; Shutthanandan, V.; Prosa, Ty J.; Adusumilli, Praneet; Arey, Bruce W.; Buxbaum, Alex; Wang, Y. C.; Tessner, Ted; Ulfig, Robert M.; Wang, Chong M.; Thevuthasan, Suntharampillai

2012-05-03T23:59:59.000Z

350

A 120-Mpc Periodicity in the Three-Dimensional Distribution of Galaxy Superclusters  

E-Print Network [OSTI]

Using a new compilation of available data on galaxy clusters and superclusters we present evidence for a quasiregular three-dimensional network of rich superclusters and voids, with the regions of high density separated by about 120 Mpc. We calculate the power spectrum for clusters of galaxies; it has a peak on the wavelength equal to the step of the network; the excess in the amplitude of the spectrum over that of the cold dark matter model is by a factor of 1.4. The probability that the spectrum can be formed within the framework of the standard cosmogony is very small. If the cluster distribution reflects the distribution of all matter (luminous and dark), then there must exists some hithero unknown process that produces regular structure on large scales.

J. Einasto; M. Einasto; S. Gottlöber; V. Müller; V. Saar; A. A. Starobinsky; E. Tago; D. Tucker; H. Andernach; P. Frisch

1997-01-06T23:59:59.000Z

351

Three Dimensional Numerical General Relativistic Hydrodynamics ; 1, Formulations, Methods, and Code Tests  

E-Print Network [OSTI]

This is the first in a series of papers on the construction and validation of a three-dimensional code for general relativistic hydrodynamics, and its application to general relativistic astrophysics. This paper studies the consistency and convergence of our general relativistic hydrodynamic treatment and its coupling to the spacetime evolutions described by the full set of Einstein equations with a perfect fluid source. The numerical treatment of the general relativistic hydrodynamic equations is based on high resolution shock capturing schemes. These schemes rely on the characteristic information of the system. A spectral decomposition for general relativistic hydrodynamics suitable for a general spacetime metric is presented. Evolutions based on three different approximate Riemann solvers coupled to four different discretizations of the Einstein equations are studied and compared. The coupling between the hydrodynamics and the spacetime (the right and left hand side of the Einstein equations) is carried ou...

Font, J A; Suen, W; Tobias, M

2000-01-01T23:59:59.000Z

352

Elimination of internal resonance problem associated with acoustic scattering by three-dimensional rigid body  

Science Journals Connector (OSTI)

In this work a simple and stable numerical method is presented utilizing the method of moments (MoM) to eliminate the internal resonance problem associated with acoustic scattering by three-dimensional rigid body subjected to a plane wave incidence. The numerical method is based on the potential theory and combines the single layer formulation (SLF) and the double layer formulation (DLF). The scattering body is approximated by planar triangular patches. For the MoM solution of SLF and DLF the basis functions have been defined with respect to the edges to approximate the unknown source distribution. These basis functions along with an efficient testing proceduregenerate accurate results at all frequencies including the characteristic frequencies. Finally the new solution method is validated with several representative examples.

B. Chandrasekhar

2004-01-01T23:59:59.000Z

353

Spontaneous three-dimensional magnetic reconnection in merging toroidal plasma experiment  

SciTech Connect (OSTI)

We investigated a new phenomenon of three-dimensional (3D) magnetic reconnection in TS-4 torus plasma merging experiments by directly measuring the 3D structures of the current sheet. Removal of all toroidal asymmetry of the device reveals that a strong external drive of reconnection inflow increases the toroidal asymmetry of the current sheet only during the reconnection. This spontaneous 3D deformation of the current sheet increases the reconnection outflow as well as the reconnection electric field, probably because local compression of the current sheet to a thickness less than the ion gyroradius triggers its strong dissipation of the current sheet, responsible for the onset of 3D reconnection. These mechanisms indicate that the 3D reconnection is a newly observed spontaneous process of fast reconnection.

Ii, Toru [Graduate School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Ono, Yasushi [Graduate School of Frontier Sciences, University of Tokyo, Chiba 277-8561 (Japan)

2013-01-15T23:59:59.000Z

354

Short- and Long- Time Transport Structures in a Three Dimensional Time Dependent Flow  

E-Print Network [OSTI]

Lagrangian transport structures for three-dimensional and time-dependent fluid flows are of great interest in numerous applications, particularly for geophysical or oceanic flows. In such flows, chaotic transport and mixing can play important environmental and ecological roles, for examples in pollution spills or plankton migration. In such flows, where simulations or observations are typically available only over a short time, understanding the difference between short-time and long-time transport structures is critical. In this paper, we use a set of classical (i.e. Poincar\\'e section, Lyapunov exponent) and alternative (i.e. finite time Lyapunov exponent, Lagrangian coherent structures) tools from dynamical systems theory that analyze chaotic transport both qualitatively and quantitatively. With this set of tools we are able to reveal, identify and highlight differences between short- and long-time transport structures inside a flow composed of a primary horizontal contra-rotating vortex chain, small later...

Chabreyrie, Rodolphe

2014-01-01T23:59:59.000Z

355

A three-dimensional model for negative half cell of the vanadium redox flow battery  

Science Journals Connector (OSTI)

A stationary, isothermal, three-dimensional model for negative half cell of the vanadium redox flow battery is developed, which is based on the comprehensive conservation laws, such as charge, mass and momentum, together with a kinetic model for reaction involving vanadium species. The model is validated against the results calculated by the available two-dimensional model. With the given geometry of the negative half cell, the distributions of velocity, concentration, overpotential and transfer current density in the sections that are perpendicular and parallel to the applied current are studied. It is shown that the distribution of the electrolyte velocity in the electrode has significant impact on the distribution of concentration, overpotential and transfer current density. The lower velocity in the electrode will cause the higher overpotential, further result in the side reaction and corrosion of key materials locally. The development of the design of the vanadium redox flow battery is discussed, and the further research is proposed.

Xiangkun Ma; Huamin Zhang; Feng Xing

2011-01-01T23:59:59.000Z

356

THREE-DIMENSIONAL SIMULATIONS OF MAGNETOHYDRODYNAMIC WAVES IN MAGNETIZED SOLAR ATMOSPHERE  

SciTech Connect (OSTI)

We present results of three-dimensional numerical simulations of magnetohydrodynamic (MHD) wave propagation in a solar magnetic flux tube. Our study aims at understanding the properties of a range of MHD wave modes generated by different photospheric motions. We consider two scenarios observed in the lower solar photosphere, namely, granular buffeting and vortex-like motion, among the simplest mechanism for the generation of waves within a strong, localized magnetic flux concentration. We show that granular buffeting is likely to generate stronger slow and fast magnetoacoustic waves as compared to swirly motions. Correspondingly, the energy flux transported differs as a result of the driving motions. We also demonstrate that the waves generated by granular buffeting are likely to manifest in stronger emission in the chromospheric network. We argue that different mechanisms of wave generation are active during the evolution of a magnetic element in the intergranular lane, resulting in temporally varying emission at chromospheric heights.

Vigeesh, G. [Department of Astronomy, New Mexico State University, Las Cruces, NM (United States); Fedun, V.; Erdelyi, R. [SP2RC, Department of Applied Mathematics, University of Sheffield (United Kingdom); Hasan, S. S. [Indian Institute of Astrophysics, Bangalore (India)

2012-08-10T23:59:59.000Z

357

Three-dimensional general relativistic hydrodynamics II: long-term dynamics of single relativistic stars  

E-Print Network [OSTI]

This is the second in a series of papers on the construction and validation of a three-dimensional code for the solution of the coupled system of the Einstein equations and of the general relativistic hydrodynamic equations, and on the application of this code to problems in general relativistic astrophysics. In particular, we report on the accuracy of our code in the long-term dynamical evolution of relativistic stars and on some new physics results obtained in the process of code testing. The tests involve single non-rotating stars in stable equilibrium, non-rotating stars undergoing radial and quadrupolar oscillations, non-rotating stars on the unstable branch of the equilibrium configurations migrating to the stable branch, non-rotating stars undergoing gravitational collapse to a black hole, and rapidly rotating stars in stable equilibrium and undergoing quasi-radial oscillations. The numerical evolutions have been carried out in full general relativity using different types of polytropic equations of state using either the rest-mass density only, or the rest-mass density and the internal energy as independent variables. New variants of the spacetime evolution and new high resolution shock capturing (HRSC) treatments based on Riemann solvers and slope limiters have been implemented and the results compared with those obtained from previous methods. Finally, we have obtained the first eigenfrequencies of rotating stars in full general relativity and rapid rotation. A long standing problem, such frequencies have not been obtained by other methods. Overall, and to the best of our knowledge, the results presented in this paper represent the most accurate long-term three-dimensional evolutions of relativistic stars available to date.

J. Font; T. Goodale; S. Iyer; M. Miller; L. Rezzolla; E. Seidel; N. Stergioulas; W. Suen; M. Tobias

2001-10-09T23:59:59.000Z

358

A FLUX ROPE NETWORK AND PARTICLE ACCELERATION IN THREE-DIMENSIONAL RELATIVISTIC MAGNETIC RECONNECTION  

SciTech Connect (OSTI)

We investigate magnetic reconnection and particle acceleration in relativistic pair plasmas with three-dimensional particle-in-cell simulations of a kinetic-scale current sheet in a periodic geometry. We include a guide field that introduces an inclination between the reconnecting field lines and explore outside-of-the-current sheet magnetizations that are significantly below those considered by other authors carrying out similar calculations. Thus, our simulations probe the transitional regime in which the magnetic and plasma pressures are of the same order of magnitude. The tearing instability is the dominant mode in the current sheet for all guide field strengths, while the linear kink mode is less important even without the guide field, except in the lower magnetization case. Oblique modes seem to be suppressed entirely. In its nonlinear evolution, the reconnection layer develops a network of interconnected and interacting magnetic flux ropes. As smaller flux ropes merge into larger ones, the reconnection layer evolves toward a three-dimensional, disordered state in which the resulting flux rope segments contain magnetic substructure on plasma skin depth scales. Embedded in the flux ropes, we detect spatially and temporally intermittent sites of dissipation reflected in peaks in the parallel electric field. Magnetic dissipation and particle acceleration persist until the end of the simulations, with simulations with higher magnetization and lower guide field strength exhibiting greater and faster energy conversion and particle energization. At the end of our largest simulation, the particle energy spectrum attains a tail extending to high Lorentz factors that is best modeled with a combination of two additional thermal components. We confirm that the primary energization mechanism is acceleration by the electric field in the X-line region. The highest-energy positrons (electrons) are moderately beamed with median angles {approx}30 Degree-Sign -40 Degree-Sign relative to (the opposite of) the direction of the initial current density, but we speculate that reconnection in more highly magnetized plasmas would give rise to stronger beaming. Finally, we discuss the implications of our results for macroscopic reconnection sites, and which of our results may be expected to hold in systems with higher magnetizations.

Kagan, Daniel; Milosavljevic, Milos [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States); Spitkovsky, Anatoly [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

2013-09-01T23:59:59.000Z

359

Revealing the escape mechanism of three-dimensional orbits in a tidally limited star cluster  

E-Print Network [OSTI]

The aim of this work is to explore the escape process of three-dimensional orbits in a star cluster rotating around its parent galaxy in a circular orbit. The gravitational field of the cluster is represented by a smooth, spherically symmetric Plummer potential, while the tidal approximation was used to model the steady tidal field of the galaxy. We conduct a thorough numerical analysis distinguishing between regular and chaotic orbits as well as between trapped and escaping orbits, considering only unbounded motion for several energy levels. It is of particular interest to locate the escape basins towards the two exit channels and relate them with the corresponding escape times of the orbits. For this purpose, we split our investigation into three cases depending on the initial value of the $z$ coordinate which was used for launching the stars. The most noticeable finding is that the majority of stars initiated very close to the primary $(x,y)$ plane move in chaotic orbits and they remain trapped for vast time intervals, while orbits with relatively high values of $z_0$ on the other hand, form well-defined basins of escape. It was also observed, that for energy levels close to the critical escape energy the escape rates of orbits are large, while for much higher values of energy most of the orbits have low escape periods or they escape immediately to infinity. We hope our outcomes to be useful for a further understanding of the dissolution process and the escape mechanism in open star clusters.

Euaggelos E. Zotos

2014-11-18T23:59:59.000Z

360

Three-dimensional hydrodynamic simulations of asymmetric pulsar wind bow shocks  

E-Print Network [OSTI]

We present three-dimensional, nonrelativistic, hydrodynamic simulations of bow shocks in pulsar wind nebulae. The simulations are performed for a range of initial and boundary conditions to quantify the degree of asymmetry produced by latitudinal variations in the momentum flux of the pulsar wind, radiative cooling in the postshock flow, and density gradients in the interstellar medium (ISM). We find that the bow shock is stable even when travelling through a strong ISM gradient. We demonstrate how the shape of the bow shock changes when the pulsar encounters density variations in the ISM. We show that a density wall can account for the peculiar bow shock shapes of the nebulae around PSR J2124-3358 and PSR B0740-28. A wall produces kinks in the shock, whereas a smooth ISM density gradient tilts the shock. We conclude that the anisotropy of the wind momentum flux alone cannot explain the observed bow shock morphologies but it is instead necessary to take into account external effects. We show that the analytic (single layer, thin shell) solution is a good approximation when the momentum flux is anisotropic, fails for a steep ISM density gradient, and ap- proaches the numerical solution for efficient cooling. We provide analytic expressions for the latitudinal dependence of a vacuum-dipole wind and the associated shock shape, and compare the results to a split-monopole wind. We find that we are unable to distinguish between these two wind models purely from the bow shock morphology.

M. Vigelius; A. Melatos; S. Chatterjee; B. M. Gaensler; P. Ghavamian

2006-10-16T23:59:59.000Z

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361

Analysis of BWR core nuclear thermal hydraulic oscillation with three dimensional transient program  

Science Journals Connector (OSTI)

A three-dimensional BWR core dynamics program STANDY has been developed. STANDY takes into account parallel channel effect and evaluates fuel thermal margin. Peach Bottom 2 and Vermont Yankee stability test data have been analyzed by STANDY. Calculated decay ratios and resonance frequencies agreed well with measured data. Limit cycle oscillation at Vermont Yankee test has been also simulated. Oscillation amplitude agreed well with experiment. A hypothetical core condition has been made up to examine unstable oscillations in BWR core. Analyses of the core revealed that oscillation at conditions close to instability initiation reaches small amplitude limit cycle, and change in fuel thermal margin is very small during the limit cycle. Although increase in core power or decrease in flow causes rapid increase in power oscillation amplitude, the ratio of thermal margin change to power amplitude stays almost constant. It has also been found that increase in hot channel power level does not necessarily cause larger thermal margin change because higher power may widen frequency difference between core average and hot channel.

O. Yokomizo; M. Sakurai; Y. Yoshimoto; K. Kitayama; T. Enomoto; N. Fukuda; K. Chuman

1987-01-01T23:59:59.000Z

362

Effective viscosity of bacterial suspensions: a three-dimensional PDE model with stochastic torque.  

SciTech Connect (OSTI)

We present a PDE model for dilute suspensions of swimming bacteria in a three-dimensional Stokesian fluid. This model is used to calculate the statistically-stationary bulk deviatoric stress and effective viscosity of the suspension from the microscopic details of the interaction of an elongated body with the background flow. A bacterium is modeled as an impenetrable prolate spheroid with self-propulsion provided by a point force, which appears in the model as an inhomogeneous delta function in the PDE. The bacterium is also subject to a stochastic torque in order to model tumbling (random reorientation). Due to a bacterium's asymmetric shape, interactions with prescribed generic planar background flows, such as a pure straining or planar shear flow, cause the bacterium to preferentially align in certain directions. Due to the stochastic torque, the steady-state distribution of orientations is unique for a given background flow. Under this distribution of orientations, self-propulsion produces a reduction in the effective viscosity. For sufficiently weak background flows, the effect of self-propulsion on the effective viscosity dominates all other contributions, leading to an effective viscosity of the suspension that is lower than the viscosity of the ambient fluid. This is in qualitative agreement with recent experiments on suspensions of Bacillus subtilis.

Haines, B. M.; Aranson, I. S.; Berlyand, L.; Karpeev, D. A. (Mathematics and Computer Science); ( MSD); (Penn State Univ.)

2012-01-01T23:59:59.000Z

363

Quantitative study of two- and three-dimensional strong localization of matter waves by atomic scatterers  

SciTech Connect (OSTI)

We study the strong localization of atomic matter waves in a disordered potential created by atoms pinned at the nodes of a lattice, for both three-dimensional (3D) and two-dimensional (2D) systems. The localization length of the matter wave, the density of localized states, and the occurrence of energy mobility edges (for the 3D system), are numerically investigated as a function of the effective scattering length between the atomic matter wave and the pinned atoms. Both positive and negative matter wave energies are explored. Interesting features of the density of states are discovered at negative energies, where maxima in the density of bound states for the system can be interpreted in terms of bound states of a matter wave atom with a few pinned atomic scatterers. In 3D we found evidence of up to three mobility edges, one at positive energies, and two at negative energies, the latter corresponding to transitions between extended and localized bound states. In 2D, no mobility edge is found, and a rapid exponential-like increase of the localization length is observed at high energy.

Antezza, Mauro; Castin, Yvan; Hutchinson, David A. W. [Laboratoire Kastler Brossel, Ecole Normale Superieure, CNRS and UPMC, 24 rue Lhomond, F-75231 Paris (France); Jack Dodd Centre for Quantum Technology, Department of Physics, University of Otago, Dunedin 9016 (New Zealand)

2010-10-15T23:59:59.000Z

364

Quantitative study of two- and three-dimensional strong localization of matter waves by atomic scatterers  

Science Journals Connector (OSTI)

We study the strong localization of atomic matter waves in a disordered potential created by atoms pinned at the nodes of a lattice, for both three-dimensional (3D) and two-dimensional (2D) systems. The localization length of the matter wave, the density of localized states, and the occurrence of energy mobility edges (for the 3D system), are numerically investigated as a function of the effective scattering length between the atomic matter wave and the pinned atoms. Both positive and negative matter wave energies are explored. Interesting features of the density of states are discovered at negative energies, where maxima in the density of bound states for the system can be interpreted in terms of bound states of a matter wave atom with a few pinned atomic scatterers. In 3D we found evidence of up to three mobility edges, one at positive energies, and two at negative energies, the latter corresponding to transitions between extended and localized bound states. In 2D, no mobility edge is found, and a rapid exponential-like increase of the localization length is observed at high energy.

Mauro Antezza; Yvan Castin; David A. W. Hutchinson

2010-10-07T23:59:59.000Z

365

Geodesic flow on three dimensional ellipsoids with equal semi-axes  

E-Print Network [OSTI]

Following on from our previous study of the geodesic flow on three dimensional ellipsoid with equal middle semi-axes, here we study the remaining cases: Ellipsoids with two sets of equal semi-axes with $SO(2) \\times SO(2)$ symmetry, ellipsoids with equal larger or smaller semi-axes with SO(2) symmetry, and ellipsoids with three semi-axes coinciding with SO(3) symmetry. All of these cases are Liouville-integrable, and reduction of the symmetry leads to singular reduced systems on lower-dimensional ellipsoids. The critical values of the energy-momentum maps and their singular fibers are completely classified. In the cases with SO(2) symmetry there are corank 1 degenerate critical points; all other critical points are non-degenreate. We show that in the case with $SO(2) \\times SO(2)$ symmetry three global action variables exist and the image of the energy surface under the energy-momentum map is a convex polyhedron. The case with SO(3) symmetry is non-commutatively integrable, and we show that the fibers over regular points of the energy-casimir map are $T^2$ bundles over $S^2$.

Chris M. Davison; Holger R. Dullin

2006-11-22T23:59:59.000Z

366

Three dimensional thermal-solute phase field simulation of binary alloy solidification  

E-Print Network [OSTI]

We employ adaptive mesh refinement, implicit time stepping, a nonlinear multigrid solver and parallel computation, to solve a multi-scale, time dependent, three dimensional, nonlinear set of coupled partial differential equations for three scalar field variables. The mathematical model represents the non-isothermal solidification of a metal alloy into a melt substantially cooled below its freezing point at the microscale. Underlying physical molecular forces are captured at this scale by a specification of the energy field. The time rate of change of the temperature, alloy concentration and an order parameter to govern the state of the material (liquid or solid) is controlled by the diffusion parameters and variational derivatives of the energy functional. The physical problem is important to material scientists for the development of solid metal alloys and, hitherto, this fully coupled thermal problem has not been simulated in three dimensions, due to its computationally demanding nature. By bringing together state of the art numerical techniques this problem is now shown here to be tractable at appropriate resolution with relatively moderate computational resources.

P. C. Bollada; C. E. Goodyer; P. K. Jimack; A. M. Mullis; F. W. Yang

2014-09-22T23:59:59.000Z

367

Distributed three-dimensional finite-difference modeling of wave propagation in acoustic media  

Science Journals Connector (OSTI)

Finite-difference modeling of wave propagation in heterogeneous media is a useful technique in a number of disciplines including earthquake and oil exploration seismology laboratory ultrasonics ocean acoustics radar imaging nondestructive evaluation and others. However the size of the models that can be treated by finite-difference methods in three spatial dimensions has limited their application to supercomputers. We describe a finite-difference domain-decomposition method for the three-dimensional acoustic wave equation which is well suited to distributed parallelization. We have implemented this algorithm using the PVM message-passing library and show here benchmarks on two different distributed memory architectures the IBM SP2 and a network of low-cost PCs running the Linux operating system. We present performance measurements of this algorithm on both the low-bandwidth PC network (10-Mbits/s Ethernet) and the high-bandwidth SP2 cluster (40-Mbits/s switch). These results demonstrate the feasibility of doing distributed finite-difference acoustic modeling on networks of workstations but point to the substantial efficiencies that can be expected as higher bandwidth networks become available. © 1997 American Institute of Physics.

Alberto Villarreal

1997-01-01T23:59:59.000Z

368

Three-dimensional imaging and precision metrology for liquid-salt-cooled reactors  

SciTech Connect (OSTI)

The liquid-salt-cooled very high temperature reactor, also called the Advanced High-Temperature Reactor (AHTR), is a new large high-temperature reactor concept that combines in a novel way four established technologies: (1) coated-particle graphite-matrix nuclear fuels, (2) Brayton power cycles, (3) passive safety systems and plant designs previously developed for liquid-metal-cooled fast reactors, and (4) low-pressure liquid-salt coolants. The AHTR will require refueling, in-service inspection, and maintenance (RIM) with supporting instrumentation systems. The fluoride salts that are being evaluated as potential reactor coolants have melting points between 350 and 500 deg. C, values that imply minimum RIM temperatures between 400 and 550 deg. C. These salts are transparent over a wider range of the light spectrum than is water. The high temperatures, the optical characteristics of the coolant, and advances in metrology may enable the use of lasers to create three-dimensional images of the reactor interior to assist refueling, monitor vibrations in components, map fluid flow, and enable inspections of internal reactor components. A description of the reactor and an initial evaluation of the use of optical techniques for AHTR instrumentation are provided. (authors)

Forsberg, C. W. [Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6165 (United States); Varma, V. K.; Burgess, T. W. [Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6304 (United States)

2006-07-01T23:59:59.000Z

369

Simulations of detonation wave propagation in rectangular ducts using a three-dimensional WENO scheme  

SciTech Connect (OSTI)

This paper reports high resolution simulations using a fifth-order weighted essentially non-oscillatory (WENO) scheme with a third-order TVD Runge-Kutta time stepping method to examine the features of detonation front and physics in square ducts. The simulations suggest that two and three-dimensional detonation wave front formations are greatly enhanced by the presence of transverse waves. The motion of transverse waves generates triple points (zones of high pressure and large velocity coupled together), which cause the detonation front to become locally overdriven and thus form ''hot spots.'' The transversal motion of these hot spots maintains the detonation to continuously occur along the whole front in two and three dimensions. The present simulations indicate that the influence of the transverse waves on detonation is more profound in three dimensions and the pattern of quasi-steady detonation fronts also depends on the duct size. For a ''narrow'' duct (4L x 4L where L is the half-reaction length), the detonation front displays a distinctive ''spinning'' motion about the axial direction with a well-defined period. For a wider duct (20L x 20L), the detonation front exhibits a ''rectangular mode'' periodically, with the front displaying ''convex'' and ''concave'' shapes one following the other and the transverse waves on the four walls being partly out-of-phase with each other. (author)

Dou, Hua-Shu; Tsai, Her Mann [Temasek Laboratories, National University of Singapore (Singapore); Khoo, Boo Cheong; Qiu, Jianxian [Department of Mechanical Engineering, National University of Singapore (Singapore)

2008-09-15T23:59:59.000Z

370

The Three-Dimensional Morphology of Stylolites: Roughness Analysis and Possible Genetic Implications  

SciTech Connect (OSTI)

Stylolites are dynamic roughly planar surfaces formed by pressure solution of blocks of rocks into each other. The three-dimensional geometry of 12 bedding-parallel stylolites in several limestones was measured using laser and mechanical profilometers, and statistical characteristics of the surfaces were calculated. All the stylolites analyzed turn out to have self-affine fractal roughness with a well-characterized crossover length scale separating two self-affine regimes. Strikingly, this characteristic length scale falls within a very narrow range for all the stylolites studied, regardless of the microstructure sizes. To explain the data, we propose a continuous phenomenological model that accounts for the development of the measured roughness from an initially flat surface. The model postulates that the complex interface morphology is the result of competition between the long-range elastic redistribution of local stress fluctuations, which roughen the surface, and surface tension forces along the interface, which smooth it. The model accounts for the geometrical variability of stylolite surfaces and predicts the dependence of the crossover length scale on the mechanical properties of the rock.

Francois Renard; Jean Schmittbuhl; Jean-Pierre Gratier; Paul Meakin; Enrique Merino

2004-02-01T23:59:59.000Z

371

A system for combined three-dimensional morphological and molecular analysis of thick tissue specimens  

SciTech Connect (OSTI)

We present a new system for simultaneous morphological and molecular analysis of thick tissue samples. The system is composed of a computer assisted microscope and a JAVA-based image display, analysis and visualization program that allows acquisition, annotation, meaningful storage, three-dimensional reconstruction and analysis of structures of interest in thick sectioned tissue specimens. We describe the system in detail and illustrate its use by imaging, reconstructing and analyzing two complete tissue blocks which were differently processed and stained. One block was obtained from a ductal carcinoma in situ (DCIS) lumpectomy specimen and stained alternatively with Hematoxilyn and Eosin (H&E), and with a counterstain and fluorescence in situ hybridization (FISH) to the ERB-B2 gene. The second block contained a fully sectioned mammary gland of a mouse, stained for Histology with H&E. We show how the system greatly reduces the amount of interaction required for the acquisition and analysis and is therefore suitable for studies that require morphologically driven, wide scale (e.g., whole gland) analysis of complex tissue samples or cultures.

Fernandez-Gonzalez, Rodrigo; Jones, Arthur; Garcia-Rodriguez, Enrique; Yuan Chen, Ping; Idica, Adam; Lockett, Stephen J.; Barcellos-Hoff, Mary Helen; Ortiz-de-Solorzano, Carlos

2002-04-25T23:59:59.000Z

372

Electric charge in the field of a magnetic event in three-dimensional spacetime  

E-Print Network [OSTI]

We analyze the motion of an electric charge in the field of a magnetically charged event in three-dimensional spacetime. We start by exhibiting a first integral of the equations of motion in terms of the three conserved components of the spacetime angular momentum, and then proceed numerically. After crossing the light cone of the event, an electric charge initially at rest starts rotating and slowing down. There are two lengths appearing in the problem: (i) the characteristic length $\\frac{q g}{2 \\pi m}$, where $q$ and $m$ are the electric charge and mass of the particle, and $g$ is the magnetic charge of the event; and (ii) the spacetime impact parameter $r_0$. For $r_0 \\gg \\frac{q g}{2 \\pi m}$, after a time of order $r_0$, the particle makes sharply a quarter of a turn and comes to rest at the same spatial position at which the event happened in the past. This jump is the main signature of the presence of the magnetic event as felt by an electric charge. A derivation of the expression for the angular momentum that uses Noether's theorem in the magnetic representation is given in the Appendix.

Claudio Bunster; Cristian Martinez

2012-02-09T23:59:59.000Z

373

Three-dimensional CFD simulation of hydrodynamics in an interconnected fluidized bed for chemical looping combustion  

Science Journals Connector (OSTI)

Abstract A hydrodynamic model of an interconnected fluidized bed for chemical looping combustion was established based on the Eulerian–Eulerian two-fluid model with the kinetic theory of granular flow. The effect of the drag model on the computational results was investigated and detailed hydrodynamics were predicted in the three-dimensional circulating fluidized bed (composed of a riser, bubbling bed, pot-seal and cyclone). Both qualitative and quantitative results indicated that the drag model had a significant effect on the flow behavior. The Gidaspow and the Syamlal & O'Brien drag models both produced accurate predictions in this study. The pressure balance of an interconnected fluidized bed revealed that the pressure in the bubbling bed was lower than that in the pot-seal and the riser, whilst still being higher than the pressure in the cyclone. The riser and bubbling bed were individually operated in fast and bubbling fluidization regions. The three distinct regions identified from the bottom to the top of the riser were: entrance region, bulk region and exit region. The solids volume fraction was higher in the near-wall region but lower in the center region for both the riser and bubbling bed. The coupled characteristics of the fluidized bed were predominantly identified by the strong effect of operational gas velocity in the riser on the hydrodynamics in the bubbling bed.

Yanjun Guan; Jian Chang; Kai Zhang; Baodong Wang; Qi Sun

2014-01-01T23:59:59.000Z

374

Acoustic Performance of an Installed Real-Time Three-Dimensional Audio System  

Science Journals Connector (OSTI)

The Exterior Effects Room (EER) located at the NASA Langley Research Center is a facility built for psychoacoustic studies of aircraft community noise. Recently the EER was significantly upgraded to allow for simulation of aircraft flyovers in a three-dimensional audio and visual environment. The upgrade included installation of 27 satellite and 4 subwoofer loudspeakers that are driven by a real-time audio server. The audio server employs an implementation of the Vector Base Amplitude Panning (VBAP) method to position virtual sources at arbitrary azimuth and elevation angles in the EER. Real-time application of filters time delays and gains are required to compensate for installation effects including those associated with the irregular room geometry colorization due to varying loudspeaker installations and crossover filtering. The authors previously showed [J. Acoust. Soc. Am. 127 1969 (2010)] that color compensation and crossover filtering could be achieved for satellite and subwoofer loudspeakers. However the resulting FIR filters were too long (32 768 taps) to implement in real-time. The focus of this work is on development of reduced-length surrogate IIR filters and on measurement of the acoustic performance of the installed real-time system.

Kenneth Faller II; Stephen A. Rizzi; Noah Schiller; Randolph Cabell; Jacob Klos; William L. Chapin; Aric R. Aumann

2012-01-01T23:59:59.000Z

375

Acoustic performance of an installed real?time three?dimensional audio system—Part II.  

Science Journals Connector (OSTI)

The exterior effects room (EER) located at the NASA Langley Research Center was recently upgraded to allow for simulation of aircraft flyovers in a three?dimensional (3?D) audio and visual environment. The 3?D audio server employs an implementation of the vector base amplitude panning (VBAP) method to position virtual sources at arbitrary azimuth and elevation angles in the EER. Recent work focused on the development of loudspeaker equalization first using high order FIR filters [POMA 9 015004 (2010)] and later using low order IIR filters [J. Acoust. Soc. Am. 128 2482 (2010)]. The latter in conjunction with full?path time delay compensation and relative gain compensation were implemented in real?time and shown to reproduce the desired sound field to within about ±5 dB over an extended frequency range for stationary and moving sources. In the present work the performance is further characterized both objectively and subjectively. Addressed are calibration of the system for absolute sound pressure level reproduction and measurement of the spatial uniformity of the generatedsound field. Further localization of sound sources will be subjectively measured to assess the efficacy of the VBAP implementation in the EER.

Kenneth J. Faller II; Stephen A. Rizzi; Aric R. Aumann

2011-01-01T23:59:59.000Z

376

A three-dimensional upwind PNS code for chemically reacting scramjet flowfields. [Parabolized Navier Stokes  

SciTech Connect (OSTI)

A new upwind, parabolized Navier-Stokes (PNS) code has been developed to compute the three-dimensional (3D) chemically reacting flow in scramjet (supersonic combustion ramjet) engines. The code is a modification of the 3D upwind PNS (UPS) airflow code which has been extended in the present study to permit internal flow calculations with hydrogen-air chemistry. With these additions, the new code has the capability of computing aerodynamic and propulsive flowfields simultaneously. The algorithm solves the PNS equations using a finite-volume, upwind TVD method based on Roe's approximate Riemann solver that has been modified to account for 'real gas' effects. The fluid medium is assumed to be a chemically reacting mixture of thermally perfect (but calorically imperfect) gases in thermal equilibrium. The new code has been applied to two test cases. These include the Burrows-Kurkov supersonic combustion experiment and a generic 3D scramjet flowfield. The computed results compare favorably with the available experimental data. 38 refs.

Wadawadigi, G.; Tannehill, J.C.; Buelow, P.E.; Lawrence, S.L. (Iowa State University of Science and Technology, Ames (United States) NASA, Ames Research Center, Moffett Field, CA (United States))

1992-07-01T23:59:59.000Z

377

Neutronics code VALE for two-dimensional triagonal (hexagonal) and three-dimensional geometries  

SciTech Connect (OSTI)

This report documents the computer code VALE designed to solve multigroup neutronics problems with the diffusion theory approximation to neutron transport for a triagonal arrangement of mesh points on planes in two- and three-dimensional geometry. This code parallels the VENTURE neutronics code in the local computation system, making exposure and fuel management capabilities available. It uses and generates interface data files adopted in the cooperative effort sponsored by Reactor Physics RRT Division of the US DOE. The programming in FORTRAN is straightforward, although data is transferred in blocks between auxiliary storage devices and main core, and direct access schemes are used. The size of problems which can be handled is essentially limited only by cost of calculation since the arrays are variably dimensioned. The memory requirement is held down while data transfer during iteration is increased only as necessary with problem size. There is provision for the more common boundary conditions including the repeating boundary, 180/sup 0/ rotational symmetry, and the rotational symmetry conditions for the 30/sup 0/, 60/sup 0/, and 120/sup 0/ triangular grids on planes. A variety of types of problems may be solved: the usual neutron flux eignevalue problem, or a direct criticality search on the buckling, on a reciprocal velocity absorber (prompt mode), or on nuclide concentrations. The adjoint problem and fixed source problem may be solved, as well as the dominating higher harmonic, or the importance problem for an arbitrary fixed source.

Vondy, D.R.; Fowler, T.B.

1981-08-01T23:59:59.000Z

378

Continuous data assimilation for the three-dimensional Brinkman-Forchheimer-extended Darcy model  

E-Print Network [OSTI]

In this paper we introduce and analyze an algorithm for continuous data assimilation for a three-dimensional Brinkman-Forchheimer-extended Darcy (3D BFeD) model of porous media. This model is believed to be accurate when the flow velocity is too large for Darcy's law to be valid, and additionally the porosity is not too small. The algorithm is inspired by ideas developed for designing finite-parameters feedback control for dissipative systems. It aims to obtaining improved estimates of the state of the physical system by incorporating deterministic or noisy measurements and observations. Specifically, the algorithm involves a feedback control that nudges the large scales of the approximate solution toward those of the reference solution associated with the spatial measurements. In the first part of the paper, we present few results of existence and uniqueness of weak and strong solutions of the 3D BFeD system. The second part is devoted to the setting and convergence analysis of the data assimilation algorith...

Markowich, Peter A; Trabelsi, Saber

2015-01-01T23:59:59.000Z

379

A reduced temperature solid oxide fuel cell with three-dimensionally ordered macroporous cathode  

SciTech Connect (OSTI)

Three-dimensionally ordered macroporous cathode was fabricated for a zirconia based micro-tubular solid oxide fuel cells (SOFCs). Three different cathodes (cathode A, no pore former; cathode B, with pore former (1.5 {micro}m in diameter); cathode C, with pore former (0.8 {micro}m in diameter)) were compared to investigate how the microstructure of it affected the cell performance at various operating temperatures. Micro-sized pores were well distributed within cathode B and C. The total porosity of cathode A is 35%, while it respectively reached 42 and 50% for cathodes B and C. At the same time, the specific surface area of them was 28.8 and 52.0% larger than that of the cathode A. As a result, the peak power density of the zirconia based cell, with cathode C, was 0.25 and 0.56 W cm{sup -2} at 550 and 600 C, while the respective value was just 0.11 and 0.30 W cm{sup -2} for the cell with cathode A. Thus, optimizing microstructure of cathode should be one of the best approaches for lowering the operating temperature for SOFCs.

Liang, B.; Suzuki, T.; Hamamoto, K.; Yamaguchi, T.; Sumi, H.; Fujishiro, Y.; Ingram, B. J.; Carter, J. D. (Chemical Sciences and Engineering Division); (National Institute of Advanced Industrial Science and Technology)

2012-01-01T23:59:59.000Z

380

Thermodynamic balance of three-dimensional stratospheric winds derived from a data assimilation procedure  

SciTech Connect (OSTI)

The NASA/Goddard three-dimensional chemistry and transport model is driven by winds from a stratospheric data assimilation system. Synoptic- and planetary-scale patterns, apparent in satellite observations of trace constituents, are successfully reproduced for seasonal integrations. As model integrations proceed, however, the quality of simulations decrease, and systematic differences between calculation and measurement appear. The differences are explained by examining the zonal-mean residual circulation. The vertical residual velocity [bar w]* is calculated two ways: (i) from the diabatic heating rates and temperature tendency and (ii) from the Eulerian vertical velocity and the horizontal eddy heat flux convergence. The results from these calculations differ substantially. Periodic insertion of observational data during the assimilation process continually shocks the general circulation model and produces these differences, which leads to an overestimate of the mean vertical heat and constituent transport. Such differences are expected to be general to all data assimilation products. This interpretation is corroborated by two-dimensional (2D) model calculations. When [bar w]* is calculated from (ii), the 2D ozone evolution is unrealistic and qualitatively similar to the 3D model simulation. The 2D ozone evolution is reasonable when [bar w]* is calculated from (i). 23 refs., 6 figs.

Weaver, C.J. (Applied Research Corp., Landover, MD (United States)); Douglass, A.R.; Rood, R.B. (NASA/Goddard Space Flight Center, Greenbelt, MD (United States))

1993-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-dimensional nuclear magnetic resonance imaging of green-state ceramics  

SciTech Connect (OSTI)

Objective is the development of nuclear magnetic resonance imaging techniques and technology applicable to the nondestructive characterization of green-state ceramics. To this end, a three-dimensional (3-D) NMR imaging technique has been developed, based on a back-projection acquisition protocol in combination with image reconstruction techniques that are based on 3-D Radon transform inversion. The method incorporates the experimental flexibility to overcome many of the difficulties associated with imaging of solid and semisolid broad-line materials, and also provides contiguously sampled data in three dimensions. This technique has been evaluated as a nondestructive characterizauon method for determining the spatial distribution of organic additves in green-state injection-molded cylindrical Si{sub 3}N{sup 4} tensile specimens. The technique has been evaluated on the basis of providing moderate image resolution over large sample volumes, high resolution over smaller specimen volumes, and sensitivity to variations in the concentration of organics. Resolution of 200{mu}m has been obtained with excellent sensitivity to concentration. A detailed account of the 3-D imaging results obtained from the study, a discussion of the difficulties and limitations of the imaging technique, and suggestions for technique and system improvements are included.

Dieckman, S.L.; Gopalsami, N.; Ford, J.M.; Raptis, A.C.; Ellingson, W.A. (Argonne National Lab., IL (United States)); Rizo, P. (CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France). Lab. d'Electronique et de Technologie de l'Informatique); Tracey, D.M.; Pujari, V.K. (Norton Co., Northboro, MA (United States))

1991-09-01T23:59:59.000Z

382

Application of equivalent elastic methods in three-dimensional finite element structural analysis  

SciTech Connect (OSTI)

This paper describes use of equivalent solid (EQS) modeling to obtain efficient solutions to perforated material problems using three-dimensional finite element analysis (3-D-FEA) programs. It is shown that EQS modeling in 3-D-FEA requires an EQS constitutive relationship with a sufficient number of independent constants to allow the EQS material to respond according to the elastic symmetry of the penetration pattern. It is also shown that a 3-D-FEA submodel approach to calculate peak stresses and ligament stresses from EQS results is very accurate and preferred over more traditional stress multiplier approaches. The method is demonstrated on the problem of a transversely pressurized simply supported plate with a central divider lane separating two perforated regions with circular penetrations arranged in a square pattern. A 3-D-FEA solution for a model that incorporates each penetration explicitly is used for comparison with results from an EQS solution for the plate. Results for deflection and stresses from the EQS solution are within 3% of results from the explicit 3-D-FE model. A solution to the sample problem is also provided using the procedures in the ASME B and PV Code. The ASME B and PV Code formulas for plate deflection were shown to overestimate the stiffening effects of the divider lane and the outer stiffening ring.

Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Holliday, J.E.; Jandrasits, W.G. [Bechtel Bettis, Inc., West Mifflin, PA (United States). Bettis Atomic Power Lab.

1999-08-01T23:59:59.000Z

383

Three-dimensional electromagnetic model of the pulsed-power Z-pinch accelerator  

Science Journals Connector (OSTI)

A three-dimensional, fully electromagnetic model of the principal pulsed-power components of the 26-MA ZR accelerator [D.?H. McDaniel et al., in Proceedings of the 5th International Conference on Dense Z-Pinches (AIP, New York, 2002), p. 23] has been developed. This large-scale simulation model tracks the evolution of electromagnetic waves through the accelerator’s intermediate-storage capacitors, laser-triggered gas switches, pulse-forming lines, water switches, triplate transmission lines, and water convolute to the vacuum insulator stack. The insulator-stack electrodes are coupled to a transmission-line circuit model of the four-level magnetically insulated vacuum-transmission-line section and double-post-hole convolute. The vacuum-section circuit model is terminated by a one-dimensional self-consistent dynamic model of an imploding z-pinch load. The simulation results are compared with electrical measurements made throughout the ZR accelerator, and are in good agreement with the data, especially for times until peak load power. This modeling effort demonstrates that 3D electromagnetic models of large-scale, multiple-module, pulsed-power accelerators are now computationally tractable. This, in turn, presents new opportunities for simulating the operation of existing pulsed-power systems used in a variety of high-energy-density-physics and radiographic applications, as well as even higher-power next-generation accelerators before they are constructed.

D. V. Rose; D. R. Welch; E. A. Madrid; C. L. Miller; R. E. Clark; W. A. Stygar; M. E. Savage; G. A. Rochau; J. E. Bailey; T. J. Nash; M. E. Sceiford; K. W. Struve; P. A. Corcoran; B. A. Whitney

2010-01-27T23:59:59.000Z

384

A three-dimensional laboratory steam injection model allowing in situ saturation measurements  

SciTech Connect (OSTI)

The CT imaging technique together with temperature and pressure measurements were used to follow the steam propagation during steam and steam foam injection experiments in a three dimensional laboratory steam injection model. The advantages and disadvantages of different geometries were examined to find out which could best represent radial and gravity override flows and also fit the dimensions of the scanning field of the CT scanner. During experiments, steam was injected continuously at a constant rate into the water saturated model and CT scans were taken at six different cross sections of the model. Pressure and temperature data were collected with time at three different levels in the model. During steam injection experiments, the saturations obtained by CT matched well with the temperature data. That is, the steam override as observed by temperature data was also clearly seen on the CT pictures. During the runs where foam was present, the saturation distributions obtained from CT pictures showed a piston like displacement. However, the temperature distributions were different depending on the type of steam foam process used. The results clearly show that the pressure/temperature data alone are not sufficient to study steam foam in the presence of non-condensible gas.

Demiral, B.M.R.; Pettit, P.A.; Castanier, L.M.; Brigham, W.E.

1992-08-01T23:59:59.000Z

385

Three-dimensional numerical modeling of thermohaline and wind-driven circulations in the Persian Gulf  

Science Journals Connector (OSTI)

The Persian Gulf circulation is investigated with respect to the relevant forcing mechanism including wind stress and thermohaline surface fluxes by using a three-dimensional numerical hydrodynamic model. The model results show a correlation between the strength of the bottom layer outflow of the Persian Gulf and that of the Indian Ocean Surface Water (IOSW) inflow into the Gulf. The inflow of IOSW into the Gulf attain maximum values in May–June in conjunction with peak bottom outflow through the Hormuz Strait. The results of sensitivity experiment indicate that circulation is dominated by thermohaline flows at almost all parts of the Gulf. The heat fluxes play an essential role on the general circulation of the Persian Gulf. In spring and summer, the wind stress generates southeast-flowing surface currents of magnitude about 5 cm/s along the Saudi Arabia and Iranian coasts on the northern Gulf. In winter and autumn, due to weak static stability, the wind produces mesoscale eddies in most parts of the Gulf. In winter and spring the wind stress acts to reinforce the thermohaline circulation of deep outflow. Conversely, in summer and autumn the wind forcing acts in opposition to the thermohaline forcing and causes a bottom inflow from Oman Sea into the Gulf.

F. Hosseinibalam; S. Hassanzadeh; A. Rezaei-Latifi

2011-01-01T23:59:59.000Z

386

Three-Dimensional Computational Fluid Dynamics Modeling of Solid Oxide Electrolysis Cells and Stacks  

SciTech Connect (OSTI)

A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created for detailed analysis of a high-temperature electrolysis stack (solid oxide fuel cells operated as electrolyzers). Inlet and outlet plenum flow distributions are discussed. Maldistribution of plena flow show deviations in per-cell operating conditions due to non-uniformity of species concentrations. Models have also been created to simulate experimental conditions and for code validation. Comparisons between model predictions and experimental results are discussed. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the electrolysis mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, activation over-potential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Variations in flow distribution, and species concentration are discussed. End effects of flow and per-cell voltage are also considered. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition.

Grant Hawkes; James O'Brien; Carl Stoots; Stephen Herring

2008-07-01T23:59:59.000Z

387

THREE-DIMENSIONAL NUMERICAL SIMULATIONS OF FAST-TO-ALFVEN CONVERSION IN SUNSPOTS  

SciTech Connect (OSTI)

The conversion of fast waves to the Alfven mode in a realistic sunspot atmosphere is studied through three-dimensional numerical simulations. An upward propagating fast acoustic wave is excited in the high-{beta} region of the model. The new wave modes generated at the conversion layer are analyzed from the projections of the velocity and magnetic field in their characteristic directions, and the computation of their wave energy and fluxes. The analysis reveals that the maximum efficiency of the conversion to the slow mode is obtained for inclinations of 25 Degree-Sign and low azimuths, while the Alfven wave conversions peak at high inclinations and azimuths between 50 Degree-Sign and 120 Degree-Sign . Downward propagating Alfven waves appear at the regions of the sunspot where the orientation of the magnetic field is in the direction opposite to the wave propagation, since at these locations the Alfven wave couples better with the downgoing fast magnetic wave which is reflected due to the gradients of the Alfven speed. The simulations show that the Alfven energy at the chromosphere is comparable to the acoustic energy of the slow mode, being even higher at high inclined magnetic fields.

Felipe, T., E-mail: tobias@cora.nwra.com [NorthWest Research Associates, Colorado Research Associates, Boulder, CO 80301 (United States)

2012-10-20T23:59:59.000Z

388

Iterative optimizing quantization method for reconstructing three-dimensional images from a limited number of views  

DOE Patents [OSTI]

A three-dimensional image reconstruction method comprises treating the object of interest as a group of elements with a size that is determined by the resolution of the projection data, e.g., as determined by the size of each pixel. One of the projections is used as a reference projection. A fictitious object is arbitrarily defined that is constrained by such reference projection. The method modifies the known structure of the fictitious object by comparing and optimizing its four projections to those of the unknown structure of the real object and continues to iterate until the optimization is limited by the residual sum of background noise. The method is composed of several sub-processes that acquire four projections from the real data and the fictitious object: generate an arbitrary distribution to define the fictitious object, optimize the four projections, generate a new distribution for the fictitious object, and enhance the reconstructed image. The sub-process for the acquisition of the four projections from the input real data is simply the function of acquiring the four projections from the data of the transmitted intensity. The transmitted intensity represents the density distribution, that is, the distribution of absorption coefficients through the object.

Lee, Heung-Rae (Dublin, CA)

1997-01-01T23:59:59.000Z

389

High-energy Particle Transport in Three-dimensional Hydrodynamic Models of Colliding-wind Binaries  

Science Journals Connector (OSTI)

Massive stars in binary systems (such as WR 140, WR 147, or ? Carinae) have long been regarded as potential sources of high-energy ?-rays. The emission is thought to arise in the region where the stellar winds collide and produce relativistic particles that subsequently might be able to emit ?-rays. Detailed numerical hydrodynamic simulations have already offered insight into the complex dynamics of the wind collision region (WCR), while independent analytical studies, albeit with simplified descriptions of the WCR, have shed light on the spectra of charged particles. In this paper, we describe a combination of these two approaches. We present a three-dimensional hydrodynamical model for colliding stellar winds and compute spectral energy distributions of relativistic particles for the resulting structure of the WCR. The hydrodynamic part of our model incorporates the line-driven acceleration of the winds, gravity, orbital motion, and the radiative cooling of the shocked plasma. In our treatment of charged particles, we consider diffusive shock acceleration in the WCR and the subsequent cooling via inverse Compton losses (including Klein-Nishina effects), bremsstrahlung, collisions, and other energy loss mechanisms.

K. Reitberger; R. Kissmann; A. Reimer; O. Reimer; G. Dubus

2014-01-01T23:59:59.000Z

390

A three-dimensional electrostatic particle-in-cell methodology on unstructured Delaunay-Voronoi grids  

SciTech Connect (OSTI)

The mathematical formulation and computational implementation of a three-dimensional particle-in-cell methodology on unstructured Delaunay-Voronoi tetrahedral grids is presented. The method allows simulation of plasmas in complex domains and incorporates the duality of the Delaunay-Voronoi in all aspects of the particle-in-cell cycle. Charge assignment and field interpolation weighting schemes of zero- and first-order are formulated based on the theory of long-range constraints. Electric potential and fields are derived from a finite-volume formulation of Gauss' law using the Voronoi-Delaunay dual. Boundary conditions and the algorithms for injection, particle loading, particle motion, and particle tracking are implemented for unstructured Delaunay grids. Error and sensitivity analysis examines the effects of particles/cell, grid scaling, and timestep on the numerical heating, the slowing-down time, and the deflection times. The problem of current collection by cylindrical Langmuir probes in collisionless plasmas is used for validation. Numerical results compare favorably with previous numerical and analytical solutions for a wide range of probe radius to Debye length ratios, probe potentials, and electron to ion temperature ratios. The versatility of the methodology is demonstrated with the simulation of a complex plasma microsensor, a directional micro-retarding potential analyzer that includes a low transparency micro-grid.

Gatsonis, Nikolaos A. [Mechanical Engineering Department, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609 (United States)], E-mail: gatsonis@wpi.edu; Spirkin, Anton [Mechanical Engineering Department, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609 (United States)

2009-06-01T23:59:59.000Z

391

Coherence lengths for three-dimensional superconductors in the BCS-Bose picture  

Science Journals Connector (OSTI)

Following an approach similar to that of Miyake or Randeria, Duan, and Shieh in two dimensions, we study a three-dimensional many-fermion gas at zero temperature interacting via some short-ranged two-body potential. To accommodate a possible singularity (e.g., the Coulomb repulsion) in the interaction, the potential is eliminated in favor of the two-body scattering t-matrix, the low-energy form of which is expressible in terms of the s-wave scattering length as. The BCS gap equation for s-wave pairing is then solved simultaneously with the number equation in order to self-consistently obtain the zero-temperature BCS gap ? as well as the chemical potential ? as functions of the dimensionless coupling variable ??kFas, where kF is the Fermi momentum. Results are valid for arbitrary coupling strength, and in the weak coupling limit reproduce the standard BCS results. Finally, root-mean-square pair sizes are obtained as a function of ? and compared with experimental values.

R. M. Carter; M. Casas; J. M. Getino; M. de Llano; A. Puente; H. Rubio; D. M. van der Walt

1995-12-01T23:59:59.000Z

392

Advanced Reservoir Characterization and Development through High-Resolution 3C3D Seismic and Horizontal Drilling: Eva South Marrow Sand Unit, Texas County, Oklahoma  

SciTech Connect (OSTI)

The Eva South Morrow Sand Unit is located in western Texas County, Oklahoma. The field produces from an upper Morrow sandstone, termed the Eva sandstone, deposited in a transgressive valley-fill sequence. The field is defined as a combination structural stratigraphic trap; the reservoir lies in a convex up -dip bend in the valley and is truncated on the west side by the Teepee Creek fault. Although the field has been a successful waterflood since 1993, reservoir heterogeneity and compartmentalization has impeded overall sweep efficiency. A 4.25 square mile high-resolution, three component three-dimensional (3C3D) seismic survey was acquired in order to improve reservoir characterization and pinpoint the optimal location of a new horizontal producing well, the ESU 13-H.

Wheeler,David M.; Miller, William A.; Wilson, Travis C.

2002-03-11T23:59:59.000Z

393

Universality in disordered systems: The case of the three-dimensional random-bond Ising model Nikolaos G. Fytas*  

E-Print Network [OSTI]

Universality in disordered systems: The case of the three-dimensional random-bond Ising model 2010; published 3 December 2010 We study the critical behavior of the d=3 Ising model with bond of the marginal case is, of course, the general random two-dimensional 2D Ising model and this model has been

Theodorakis, Panagiotis E.

394

Three-dimensional random-field Ising magnet: Interfaces, scaling, and the nature of states A. Alan Middleton  

E-Print Network [OSTI]

Three-dimensional random-field Ising magnet: Interfaces, scaling, and the nature of states A. Alan random-field Ising magnet is studied numerically, aided by scaling analyses. Various numerical or lack thereof of an ordered phase in the random-field Ising model RFIM in three di- mensions 3D

Middleton, Alan

395

Bernstein-Greene-Kruskal Modes in a Three-Dimensional Plasma C. S. Ng and A. Bhattacharjee  

E-Print Network [OSTI]

Bernstein-Greene-Kruskal Modes in a Three-Dimensional Plasma C. S. Ng and A. Bhattacharjee Space, New Hampshire 03824, USA (Received 8 July 2005; published 9 December 2005) Bernstein-Greene that depend only on energy do not exist. However, 3D solutions that depend on energy and additional constants

Ng, Chung-Sang

396

Theory of the lattice Boltzmann method: Three-dimensional model for linear viscoelastic fluids Pierre Lallemand,1,  

E-Print Network [OSTI]

Theory of the lattice Boltzmann method: Three-dimensional model for linear viscoelastic fluids-dimensional lattice Boltzmann model with thirty two discrete velocity distribution functions for viscoelastic fluid is presented in this work. The model is based upon the generalized lattice Boltzmann equation constructed

Luo, Li-Shi

397

Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit QED Architecture  

E-Print Network [OSTI]

Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit December 2011) Superconducting quantum circuits based on Josephson junctions have made rapid progress the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated

398

Stabilization of a Three-Dimensional Limit Cycle Walking Model through Step-to-Step Ankle Control  

E-Print Network [OSTI]

Stabilization of a Three-Dimensional Limit Cycle Walking Model through Step-to-Step Ankle Control ankle control. If ankle control can contribute significantly to maintaining balance, even in the presence of active foot placement, this might provide an opportunity to improve balance using robotic ankle

Collins, Steven H.

399

Three-Dimensional Homogeneous Ferrite-Carbon Aerogel: One Pot Fabrication and Enhanced Electro-Fenton Reactivity  

Science Journals Connector (OSTI)

Three-Dimensional Homogeneous Ferrite-Carbon Aerogel: One Pot Fabrication and Enhanced Electro-Fenton Reactivity ... Before analysis, all samples withdrawn from treated solutions were filtered with 0.45 ?m PTFE filters. ... Doped Carbon Nanotube Networks for Electrochemical Filtration of Aqueous Phenol: Electrolyte Precipitation and Phenol Polymerization ...

Yujing Wang; Guohua Zhao; Shouning Chai; Hongying Zhao; Yanbin Wang

2012-12-31T23:59:59.000Z

400

NUCLEARENGINEERINGAND DESIGN17 (1971) 64.-75. NORTH-HOLLANDPUBLISHINGCOMPANY PROGRESS IN THREE-DIMENSIONAL ELASTIC-PLASTIC STRESS  

E-Print Network [OSTI]

-DIMENSIONAL ELASTIC-PLASTIC STRESS ANALYSIS FOR FRACTURE MECHANICS * N. LEVY, P.V. MARCAL and J.R. RICE Division summarizesprogressin the development of finite element methods for three-dimensionalelastic- plastic stressanalysisin methods for three-dimensional elastic-plastic stress analysis in fracture mechanics, as a part

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-dimensional multispecies MHD studies of the solar wind interaction with Mars in the presence of crustal fields  

E-Print Network [OSTI]

Three-dimensional multispecies MHD studies of the solar wind interaction with Mars in the presence of Michigan, Ann Arbor, Michigan, USA K. G. Powell Aerospace Engineering Department, University of Michigan, Ann Arbor, Michigan, USA Received 30 January 2002; revised 5 April 2002; accepted 13 May 2002

De Zeeuw, Darren L.

402

Implementation of surface tension with wall adhesion effects in a three-dimensional finite element model for fluid flow  

E-Print Network [OSTI]

- 1 - Implementation of surface tension with wall adhesion effects in a three-dimensional finite element modelling of surface tension. The external stress vectors associated with surface tension a drop of liquid on a plane is treated. Keywords : surface tension, finite element method, average

Boyer, Edmond

403

Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity James R. Wilson,a  

E-Print Network [OSTI]

1 Three-Dimensional Analysis of Solid Oxide Fuel Cell Ni-YSZ Anode Interconnectivity James R of interconnectivity of solid-oxide fuel cell (SOFC) electrode phases. The method was applied to the three, and hence was not electrochemically active. #12;2 1. Introduction Attempts to understand solid oxide fuel

Kalies, William D.

404

Two fluid effects on three-dimensional reconnection in the Swarthmore Spheromak Experiment with comparisons to space dataa...  

E-Print Network [OSTI]

Two fluid effects on three-dimensional reconnection in the Swarthmore Spheromak Experiment results are reported from spheromak merging studies at the Swarthmore Spheromak Experiment M. R. Brown in the plasma flows and heating . In this paper, we discuss three results from the Swarthmore Spheromak

Brown, Michael R.

405

Three-dimensional computer simulations of feeding behaviour in red and giant pandas relate skull biomechanics with dietary niche partitioning  

Science Journals Connector (OSTI)

...research-article Biomechanics 1001 25 70 60 144 Three-dimensional computer simulations of feeding behaviour in red and giant pandas relate...Funding statement This research was supported by a MINECO-grant (B.F.; CGL2012-37866) and a Frick Postdoctoral Fellowship...

2014-01-01T23:59:59.000Z

406

Three-Dimensional Bicomponent Supramolecular Nanoporous Self-Assembly on a Hybrid All-Carbon Atomically Flat and Transparent Platform  

Science Journals Connector (OSTI)

Three-Dimensional Bicomponent Supramolecular Nanoporous Self-Assembly on a Hybrid All-Carbon Atomically Flat and Transparent Platform ... We thank Ueli Heiz for providing experimental infrastructure at the Institute of Physical Chemistry at TUM. ... electronics are based on conjugated systems predominantly made up of sp2-hybridized carbon, such as graphene nanoribbons. ...

Juan Li; Sarah Wieghold; Murat Anil Öner; Patrick Simon; Moritz V. Hauf; Emanuela Margapoti; Jose A. Garrido; Friedrich Esch; Carlos-Andres Palma; Johannes V. Barth

2014-08-01T23:59:59.000Z

407

Nitrogen cycling in the Middle Atlantic Bight: Results from a three-dimensional model and implications for the  

E-Print Network [OSTI]

Nitrogen cycling in the Middle Atlantic Bight: Results from a three-dimensional model and adjacent deep ocean that is nested within a basin-wide North Atlantic circulation model in order to estimate nitrogen fluxes in the shelf area of the Middle Atlantic Bight (MAB). Our biological model

408

Three-dimensional crustal structure of Long Valley caldera, California, and evidence for the migration of CO2 under Mammoth  

E-Print Network [OSTI]

Three-dimensional crustal structure of Long Valley caldera, California, and evidence in Long Valley caldera in 1997. We performed a tomographic inversion for crustal structure beneath a 28 km--composition and state (old 8105); KEYWORDS: tomography, Long Valley, volcano, carbon dioxide, crustal structure

Foulger, G. R.

409

Influence of fracture scale heterogeneity on the flow properties of three-dimensional discrete fracture networks (DFN)  

E-Print Network [OSTI]

Influence of fracture scale heterogeneity on the flow properties of three-dimensional discrete fracture networks (DFN) J.-R. de Dreuzy,1,2 Y. Méheust,2 and G. Pichot3 Received 18 May 2012; revised 28 of fractured media has been so far studied independently at the fracture- and network- scales, we propose

Paris-Sud XI, Université de

410

Three-dimensional morphology evolution of SiO2 patterned films under MeV ion irradiation  

E-Print Network [OSTI]

Three-dimensional morphology evolution of SiO2 patterned films under MeV ion irradiation Kan Otani Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 Xi Chen Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027 John

Hutchinson, John W.

411

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit  

E-Print Network [OSTI]

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip (Iran) earth- quake using radar data from the Envisat satellite of the European Space Agency. Analysis. In this paper we report on deformation associated with the Mw6.5 Bam (Iran) earthquake determined using

Fialko, Yuri

412

Architectural Design of a Three Dimensional FPGA Waleed M. Meleis, Miriam Leeser, Paul Zavracky, and Mankuan M. Vai  

E-Print Network [OSTI]

Architectural Design of a Three Dimensional FPGA Waleed M. Meleis, Miriam Leeser, Paul Zavracky Abstract The design and evaluation of a 3­dimensional FPGA architecture called Rothko will be described. Rothko takes advantage of a novel 3­dimensional VLSI circuit technology developed at Northeastern

Meleis, Waleed

413

A Three-Dimensional Model of Residential Energy Consumer Archetypes for Local Energy Policy Design in the UK  

E-Print Network [OSTI]

residential energy consumers in the UK by considering property energy efficiency levels, the greenness1 A Three-Dimensional Model of Residential Energy Consumer Archetypes for Local Energy Policy lines of research in residential energy consumption in the UK, i.e. economic/infrastructure, behaviour

Aickelin, Uwe

414

Design principle for improved three-dimensional ac electro-osmotic pumps Damian Burch and Martin Z. Bazant*  

E-Print Network [OSTI]

Design principle for improved three-dimensional ac electro-osmotic pumps Damian Burch and Martin Z-dimensional 3D ac electro-osmotic ACEO pumps have recently been developed that are much faster and more robust pumps are crucial components of lab-on-a- chip systems. There is growing interest in exploiting various

Bazant, Martin Z.

415

Three-dimensional simulations of field emission through an oscillating barrier from a ,,10,0... carbon nanotube  

E-Print Network [OSTI]

of field emission through an oscillating barrier from an ideal open 10,0 carbon nanotube without adsorption is an extension of our previous investigations of field emission from carbon nanotubes12­14 to include pho- tonicThree-dimensional simulations of field emission through an oscillating barrier from a ,,10

Mayer, Alexandre

416

On the Solution of an Inverse Scattering Problem in Seismic While ...  

E-Print Network [OSTI]

Apr 27, 2001 ... bore and regarded as a seismic source, from measurements of the ... different interfaces are recorded at a line of geophones laid out on the ground. ... wave propagation problems in radially symmetric three-dimensional media .... Then we formulate our standard least-squares estimation problem as follows:.

1910-20-20T23:59:59.000Z

417

INVESTIGATING THE RELIABILITY OF CORONAL EMISSION MEASURE DISTRIBUTION DIAGNOSTICS USING THREE-DIMENSIONAL RADIATIVE MAGNETOHYDRODYNAMIC SIMULATIONS  

SciTech Connect (OSTI)

Determining the temperature distribution of coronal plasmas can provide stringent constraints on coronal heating. Current observations with the Extreme ultraviolet Imaging Spectrograph (EIS) on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory provide diagnostics of the emission measure distribution (EMD) of the coronal plasma. Here we test the reliability of temperature diagnostics using three-dimensional radiative MHD simulations. We produce synthetic observables from the models and apply the Monte Carlo Markov chain EMD diagnostic. By comparing the derived EMDs with the 'true' distributions from the model, we assess the limitations of the diagnostics as a function of the plasma parameters and the signal-to-noise ratio of the data. We find that EMDs derived from EIS synthetic data reproduce some general characteristics of the true distributions, but usually show differences from the true EMDs that are much larger than the estimated uncertainties suggest, especially when structures with significantly different density overlap along the line of sight. When using AIA synthetic data the derived EMDs reproduce the true EMDs much less accurately, especially for broad EMDs. The differences between the two instruments are due to the: (1) smaller number of constraints provided by AIA data and (2) broad temperature response function of the AIA channels which provide looser constraints to the temperature distribution. Our results suggest that EMDs derived from current observatories may often show significant discrepancies from the true EMDs, rendering their interpretation fraught with uncertainty. These inherent limitations to the method should be carefully considered when using these distributions to constrain coronal heating.

Testa, Paola [Smithsonian Astrophysical Observatory, 60 Garden Street, MS 58, Cambridge, MA 02138 (United States); De Pontieu, Bart; Martinez-Sykora, Juan [Lockheed Martin Solar and Astrophysics Laboratory, Org. A021S, Building 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Hansteen, Viggo; Carlsson, Mats, E-mail: ptesta@cfa.harvard.edu [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, NO-0315 Oslo (Norway)

2012-10-10T23:59:59.000Z

418

NONLINEAR FORCE-FREE MODELING OF A THREE-DIMENSIONAL SIGMOID OBSERVED ON THE SUN  

SciTech Connect (OSTI)

In this work, we analyze the characteristics of the three-dimensional magnetic structure of a sigmoid observed over an active region (AR 10930) and followed by X-class flares. This is accomplished by combining a nonlinear force-free field (NLFFF) model of a coronal magnetic field and the high-resolution vector-field measurement of a photospheric magnetic field by Hinode. The key findings of our analysis reveal that the value of the X-ray intensity associated with the sigmoid is more sensitive to the strength of the electric current rather than the twist of the field lines. The strong electric current flows along the magnetic field lines and composes the central part of the sigmoid, even though the twist of the field lines is weak in that region. On the other hand, the outer region (i.e., the elbow part) of the sigmoid is basically occupied by field lines of strong twist and weak current density. Consequently, weak X-ray emission is observed. As the initial Ca II illumination basically occurs from the central part of the sigmoid, this region plays an important role in determining the onset mechanism of the flare despite its weak twisted field-line configuration. We also compare our results with the magnetohydrodynamic simulation for the formation of a sigmoid. Although the estimated values of the twist from the simulation are found to be a little higher than the values obtained from the NLFFF, we find that the field-line configurations generated by the simulation and NLFFF are remarkably analogous as long as we deal with the lower coronal region.

Inoue, S.; Watari, S. [National Institute of Information and Communications Technology (NICT), 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795 (Japan); Magara, T.; Choe, G. S., E-mail: inosato@khu.ac.kr [School of Space Research, Kyung Hee University, Yongin, Gyeonggi-do 446-701 (Korea, Republic of)

2012-03-01T23:59:59.000Z

419

ACCELERATION OF CORONAL MASS EJECTIONS FROM THREE-DIMENSIONAL RECONSTRUCTION OF STEREO IMAGES  

SciTech Connect (OSTI)

We employ a three-dimensional (3D) reconstruction technique for the first time to study the kinematics of six coronal mass ejections (CMEs), using images obtained from the COR1 and COR2 coronagraphs on board the twin STEREO spacecraft, and also the eruptive prominences (EPs) associated with three of them using images from the Extreme UltraViolet Imager. A feature in the EPs and leading edges (LEs) of all the CMEs was identified and tracked in images from the two spacecraft, and a stereoscopic reconstruction technique was used to determine the 3D coordinates of these features. True velocity and acceleration were determined from the temporal evolution of the true height of the CME features. Our study of the kinematics of the CMEs in 3D reveals that the CME LE undergoes maximum acceleration typically below 2 R{sub sun}. The acceleration profiles of CMEs associated with flares and prominences exhibit different behaviors. While the CMEs not associated with prominences show a bimodal acceleration profile, those associated with prominences do not. Two of the three associated prominences in the study show a high and increasing value of acceleration up to a distance of almost 4 R{sub sun}, but acceleration of the corresponding CME LE does not show the same behavior, suggesting that the two may not be always driven by the same mechanism. One of the CMEs, although associated with a C-class flare, showed unusually high acceleration of over 1500 m s{sup -2}. Our results therefore suggest that only the flare-associated CMEs undergo residual acceleration, which indicates that the flux injection theoretical model holds well for the flare-associated CMEs, but a different mechanism should be considered for EP-associated CMEs.

Joshi, Anand D.; Srivastava, Nandita, E-mail: janandd@prl.res.in [Udaipur Solar Observatory, Physical Research Laboratory, P.O. Box 198, Badi Road, Udaipur 313001 (India)

2011-09-20T23:59:59.000Z

420

Three Dimensional Numerical General Relativistic Hydrodynamics I: Formulations, Methods, and Code Tests  

E-Print Network [OSTI]

This is the first in a series of papers on the construction and validation of a three-dimensional code for general relativistic hydrodynamics, and its application to general relativistic astrophysics. This paper studies the consistency and convergence of our general relativistic hydrodynamic treatment and its coupling to the spacetime evolutions described by the full set of Einstein equations with a perfect fluid source. The numerical treatment of the general relativistic hydrodynamic equations is based on high resolution shock capturing schemes. These schemes rely on the characteristic information of the system. A spectral decomposition for general relativistic hydrodynamics suitable for a general spacetime metric is presented. Evolutions based on three different approximate Riemann solvers coupled to four different discretizations of the Einstein equations are studied and compared. The coupling between the hydrodynamics and the spacetime (the right and left hand side of the Einstein equations) is carried out in a treatment which is second order accurate in {\\it both} space and time. Convergence tests for all twelve combinations with a variety of test beds are studied, showing consistency with the differential equations and correct convergence properties. The test-beds examined include shocktubes, Friedmann-Robertson-Walker cosmology tests, evolutions of self-gravitating compact (TOV) stars, and evolutions of relativistically boosted TOV stars. Special attention is paid to the numerical evolution of strongly gravitating objects, e.g., neutron stars, in the full theory of general relativity, including a simple, yet effective treatment for the surface region of the star (where the rest mass density is abruptly dropping to zero).

J. A. Font; M. Miller; W. Suen; M. Tobias

1998-11-04T23:59:59.000Z

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421

FISH: A Three-dimensional Parallel Magnetohydrodynamics Code for Astrophysical Applications  

Science Journals Connector (OSTI)

FISH is a fast and simple ideal magnetohydrodynamics code that scales to ~10,000 processes for a Cartesian computational domain of ~10003 cells. The simplicity of FISH has been achieved by the rigorous application of the operator splitting technique, while second-order accuracy is maintained by the symmetric ordering of the operators. Between directional sweeps, the three-dimensional data are rotated in memory so that the sweep is always performed in a cache-efficient way along the direction of contiguous memory. Hence, the code only requires a one-dimensional description of the conservation equations to be solved. This approach also enables an elegant novel parallelization of the code that is based on persistent communications with MPI for cubic domain decomposition on machines with distributed memory. This scheme is then combined with an additional OpenMP parallelization of different sweeps that can take advantage of clusters of shared memory. We document the detailed implementation of a second-order total variation diminishing advection scheme based on flux reconstruction. The magnetic fields are evolved by a constrained transport scheme. We show that the subtraction of a simple estimate of the hydrostatic gradient from the total gradients can significantly reduce the dissipation of the advection scheme in simulations of gravitationally bound hydrostatic objects. Through its simplicity and efficiency, FISH is as well suited for hydrodynamics classes as for large-scale astrophysical simulations on high-performance computer clusters. In preparation for the release of a public version, we demonstrate the performance of FISH in a suite of astrophysically orientated test cases.

R. Käppeli; S. C. Whitehouse; S. Scheidegger; U.-L. Pen; M. Liebendörfer

2011-01-01T23:59:59.000Z

422

GENERAL-RELATIVISTIC SIMULATIONS OF THREE-DIMENSIONAL CORE-COLLAPSE SUPERNOVAE  

SciTech Connect (OSTI)

We study the three-dimensional (3D) hydrodynamics of the post-core-bounce phase of the collapse of a 27 M{sub Sun} star and pay special attention to the development of the standing accretion shock instability (SASI) and neutrino-driven convection. To this end, we perform 3D general-relativistic simulations with a three-species neutrino leakage scheme. The leakage scheme captures the essential aspects of neutrino cooling, heating, and lepton number exchange as predicted by radiation-hydrodynamics simulations. The 27 M{sub Sun} progenitor was studied in 2D by Mueller et al., who observed strong growth of the SASI while neutrino-driven convection was suppressed. In our 3D simulations, neutrino-driven convection grows from numerical perturbations imposed by our Cartesian grid. It becomes the dominant instability and leads to large-scale non-oscillatory deformations of the shock front. These will result in strongly aspherical explosions without the need for large-scale SASI shock oscillations. Low-l-mode SASI oscillations are present in our models, but saturate at small amplitudes that decrease with increasing neutrino heating and vigor of convection. Our results, in agreement with simpler 3D Newtonian simulations, suggest that once neutrino-driven convection is started, it is likely to become the dominant instability in 3D. Whether it is the primary instability after bounce will ultimately depend on the physical seed perturbations present in the cores of massive stars. The gravitational wave signal, which we extract and analyze for the first time from 3D general-relativistic models, will serve as an observational probe of the postbounce dynamics and, in combination with neutrinos, may allow us to determine the primary hydrodynamic instability.

Ott, Christian D.; Abdikamalov, Ernazar; Moesta, Philipp; Haas, Roland; Drasco, Steve; O'Connor, Evan P.; Reisswig, Christian [TAPIR, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125 (United States); Meakin, Casey A. [Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM (United States); Schnetter, Erik, E-mail: cott@tapir.caltech.edu [Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)

2013-05-10T23:59:59.000Z

423

A THREE-DIMENSIONAL VIEW OF THE REMNANT OF NOVA PERSEI 1901 (GK Per)  

SciTech Connect (OSTI)

We present a kinematical study of the optical ejecta of GK Per. It is based on proper-motion measurements of 282 knots from {approx}20 images spanning 25 years. Doppler shifts are also computed for 217 knots. The combination of proper motions and radial velocities allows a unique three-dimensional view of the ejecta to be obtained. The main results are as follows: (1) the outflow is a thick shell in which knots expand with a significant range of velocities, mostly between 600 and 1000 km s{sup -1}, (2) kinematical ages indicate that knots have suffered only a modest deceleration since their ejection a century ago, (3) no evidence for anisotropy in the expansion rate is found, (4) velocity vectors are generally aligned along the radial direction, but a symmetric pattern of non-radial velocities is also observed at specific directions, and (5) the total H{alpha}+[N II] flux has been linearly decreasing at a rate of 2.6% per year in the past decade. The eastern nebular side is fading at a slower rate than the western side. Some of the knots were displayed a rapid change of brightness during the 2004-2011 period. Over a longer timescale, a progressive circularization and homogenization of the nebula are taking place; (6) a kinematic distance of 400 {+-} 30 pc is determined. These results raise some problems with the previous interpretations of the evolution of GK Per. In particular, the idea of a strong interaction of the outflow with the surrounding medium in the southwest quadrant is not supported by our data.

Liimets, T.; Verro, K.; Kolka, I. [Tartu Observatory, 61602 Toravere (Estonia); Corradi, R. L. M.; Rodriguez-Gil, P. [Instituto de Astrofisica de Canarias, Via Lactea s/n, E-38205 La Laguna, Santa Cruz de Tenerife (Spain); Santander-Garcia, M. [Observatorio Astronomico Nacional, Ap. de Correos 112, E-28803 Alcala de Henares, Madrid (Spain); Villaver, E. [Departamento de Fisica Teorica, Universidad Autonoma de Madrid, E-28049 Madrid (Spain)

2012-12-10T23:59:59.000Z

424

The Seismic Stratigraphy and Sedimentation along the Ninetyeast Ridge  

E-Print Network [OSTI]

examines the stratigraphy and sediment thickness on the ridge using new seismic data to describe the sedimentary history of NER. More than 3700 km of 2D multichannel seismic reflection profiles were collected along NER at seven sites between 5.5? N............................................................................ 28 Figure 2 Seismic Survey Map of KNOX06RR Site 758 .................................. 29 Figure 3 Total Sediment Thickness Isopach Map of KNOX06RR Site 758 .... 30 Figure 4 Seismic Reflection Profile from KNOX06RR Site 758 .................... 31...

Eisin, Amy Elizabeth

2010-10-12T23:59:59.000Z

425

Seismic Monitoring - Hanford Site  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Curation Services Ecological Monitoring Environmental Surveillance Meteorology and Climatology Services Seismic Monitoring Seismic Monitoring Email Email Page | Print Print Page...

426

THREE-DIMENSIONAL EVOLUTION OF SOLAR WIND DURING SOLAR CYCLES 22-24  

SciTech Connect (OSTI)

This paper presents an analysis of three-dimensional evolution of solar wind density turbulence and speed at various levels of solar activity between solar cycles 22 and 24. The solar wind data used in this study have been obtained from the interplanetary scintillation (IPS) measurements made at the Ooty Radio Telescope, operating at 327 MHz. Results show that (1) on average, there was a downward trend in density turbulence from the maximum of cycle 22 to the deep minimum phase of cycle 23; (2) the scattering diameter of the corona around the Sun shrunk steadily toward the Sun, starting from 2003 to the smallest size at the deepest minimum, and it corresponded to a reduction of {approx}50% in the density turbulence between the maximum and minimum phases of cycle 23; (3) the latitudinal distribution of the solar wind speed was significantly different between the minima of cycles 22 and 23. At the minimum phase of solar cycle 22, when the underlying solar magnetic field was simple and nearly dipole in nature, the high-speed streams were observed from the poles to {approx}30 Degree-Sign latitudes in both hemispheres. In contrast, in the long-decay phase of cycle 23, the sources of the high-speed wind at both poles, in accordance with the weak polar fields, occupied narrow latitude belts from poles to {approx}60 Degree-Sign latitudes. Moreover, in agreement with the large amplitude of the heliospheric current sheet, the low-speed wind prevailed in the low- and mid-latitude regions of the heliosphere. (4) At the transition phase between cycles 23 and 24, the high levels of density and density turbulence were observed close to the heliospheric equator and the low-speed solar wind extended from the equatorial-to-mid-latitude regions. The above results in comparison with Ulysses and other in situ measurements suggest that the source of the solar wind has changed globally, with the important implication that the supply of mass and energy from the Sun to the interplanetary space has been significantly reduced in the prolonged period of low solar activity. The IPS results are consistent with the onset and growth of the current solar cycle 24, starting from the middle of 2009. However, the width of the high-speed wind at the northern high latitudes has almost disappeared and indicates that the ascending phase of the current cycle has almost reached the maximum phase in the northern hemisphere of the Sun. However, in the southern part of the hemisphere, the solar activity has yet to develop and/or increase.

Manoharan, P. K., E-mail: mano@ncra.tifr.res.in [Radio Astronomy Centre, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Udhagamandalam (Ooty) 643001 (India)

2012-06-01T23:59:59.000Z

427

Three-dimensional anisotropic adaptive filtering of projection data for noise reduction in cone beam CT  

SciTech Connect (OSTI)

Purpose: The combination of quickly rotating C-arm gantry with digital flat panel has enabled the acquisition of three-dimensional data (3D) in the interventional suite. However, image quality is still somewhat limited since the hardware has not been optimized for CT imaging. Adaptive anisotropic filtering has the ability to improve image quality by reducing the noise level and therewith the radiation dose without introducing noticeable blurring. By applying the filtering prior to 3D reconstruction, noise-induced streak artifacts are reduced as compared to processing in the image domain. Methods: 3D anisotropic adaptive filtering was used to process an ensemble of 2D x-ray views acquired along a circular trajectory around an object. After arranging the input data into a 3D space (2D projections + angle), the orientation of structures was estimated using a set of differently oriented filters. The resulting tensor representation of local orientation was utilized to control the anisotropic filtering. Low-pass filtering is applied only along structures to maintain high spatial frequency components perpendicular to these. The evaluation of the proposed algorithm includes numerical simulations, phantom experiments, and in-vivo data which were acquired using an AXIOM Artis dTA C-arm system (Siemens AG, Healthcare Sector, Forchheim, Germany). Spatial resolution and noise levels were compared with and without adaptive filtering. A human observer study was carried out to evaluate low-contrast detectability. Results: The adaptive anisotropic filtering algorithm was found to significantly improve low-contrast detectability by reducing the noise level by half (reduction of the standard deviation in certain areas from 74 to 30 HU). Virtually no degradation of high contrast spatial resolution was observed in the modulation transfer function (MTF) analysis. Although the algorithm is computationally intensive, hardware acceleration using Nvidia's CUDA Interface provided an 8.9-fold speed-up of the processing (from 1336 to 150 s). Conclusions: Adaptive anisotropic filtering has the potential to substantially improve image quality and/or reduce the radiation dose required for obtaining 3D image data using cone beam CT.

Maier, Andreas; Wigstroem, Lars; Hofmann, Hannes G.; Hornegger, Joachim; Zhu Lei; Strobel, Norbert; Fahrig, Rebecca [Department of Radiology, Stanford University, Stanford, California 94305 (United States); Department of Radiology, Stanford University, Stanford, California 94305 (United States) and Center for Medical Image Science and Visualization, Linkoeping University, Linkoeping (Sweden); Pattern Recognition Laboratory, Department of Computer Science, Friedrich-Alexander University of Erlangen-Nuremberg, 91054, Erlangen (Germany); Nuclear and Radiological Engineering and Medical Physics Programs, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Siemens AG Healthcare, Forchheim 91301 (Germany); Department of Radiology, Stanford University, Stanford, California 94305 (United States)

2011-11-15T23:59:59.000Z

428

Biofabrication of a three-dimensional liver micro-organ as an in vitro drug metabolism model  

Science Journals Connector (OSTI)

In their normal in vivo matrix milieu, tissues assume complex well-organized three-dimensional architectures. Therefore, the primary aim in the tissue engineering design process is to fabricate an optimal analog of the in vivo scenario. This challenge can be addressed by applying emerging layered biofabrication approaches in which the precise configuration and composition of cells and bioactive matrix components can recapitulate the well-defined three-dimensional biomimetic microenvironments that promote cell–cell and cell–matrix interactions. Furthermore, the advent of and refinements in microfabricated systems can present physical and chemical cues to cells in a controllable and reproducible fashion unmatched with conventional cultures, resulting in the precise construction of engineered biomimetic microenvironments on the cellular length scale in geometries that are readily parallelized for high throughput in vitro models. As such, the convergence of layered solid freeform fabrication (SFF) technologies along with microfabrication techniques enables the creation of a three-dimensional micro-organ device to serve as an in vitro platform for cell culture, drug screening or to elicit further biological insights, particularly for NASA's interest in a flight-suitable high-fidelity microscale platform to study drug metabolism in space and planetary environments. The proposed model in this paper involves the combinatorial setup of an automated syringe-based, layered direct cell writing bioprinting process with micro-patterning techniques to fabricate a microscale in vitro device housing a chamber of bioprinted three-dimensional liver cell-encapsulated hydrogel-based tissue constructs in defined design patterns that biomimic the cell's natural microenvironment for enhanced biological functionality. In order to assess the structural formability and biological feasibility of such a micro-organ, reproducibly fabricated tissue constructs were biologically characterized for liver cell-specific function. Another key facet of the in vivo microenvironment that was recapitulated with the in vitro system included the necessary dynamic perfusion of the three-dimensional microscale liver analog with cells probed for their collective drug metabolic function and suitability as a drug metabolism model. This paper details the principles and methods that undergird the direct cell writing biofabrication process development and adaptation of microfluidic devices for the creation of a drug screening model, thereby establishing a novel drug metabolism study platform for NASA's interest to adopt a microfluidic microanalytical device with an embedded three-dimensional microscale liver tissue analog to assess drug pharmacokinetic profiles in planetary environments.

Robert Chang; Kamal Emami; Honglu Wu; Wei Sun

2010-01-01T23:59:59.000Z

429

A three-dimensional extinction map of the Galactic anticentre from multiband photometry  

Science Journals Connector (OSTI)

......Midplane Survey Extraordinaire; Benjamin et-al. 2005) in the mid-IR...2006); d: Taylor, Joner Jeffery (2008); e: Kalirai et-al...W. AA (2005) 440:767. Benjamin R. A. , et al. ApJ (2005...Taylor B. J. , Joner M. D., Jeffery E. J. ApJS (2008) 176......

B.-Q. Chen; X.-W. Liu; H.-B. Yuan; H.-H. Zhang; M. Schultheis; B.-W. Jiang; Y. Huang; M.-S. Xiang; H.-B. Zhao; J.-S. Yao; H. Lu

2014-01-01T23:59:59.000Z

430

Molecular-scale, Three-dimensional Non-Platinum Group Metal Electrodes for Catalysis of Fuel Cell Reactions  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Molecular-scale, Three-dimensional Non-Platinum Group Molecular-scale, Three-dimensional Non-Platinum Group Metal Electrodes for Catalysis of Fuel Cell Reactions John B. Kerr Lawrence Berkeley National Laboratory (LBNL) September 30, 2009 Team Members: Adam Weber, Rachel Segalman, Robert Kostecki, Jeff Reimer, John Arnold, Martin Head-Gordon (LBNL). Piotr Zelenay, James Boncella, Yu Seung Kim, Neil Henson, Jerzy Chlistunoff (LANL). Steve Hamrock, Radoslav Atanasoski (3M) Budget: DOE share - $9.58MM over four years; 3M share - in-kind over four years. 2 Objectives 1) Demonstrate that non-platinum group metal catalysts can be used for oxygen reduction in polymer-coated electrode structures based on polyelectrolyte membranes. 2) Incorporate catalysts into polymer binders of composite electrodes for the construction of MEAs to demonstrate that this

431

Three-dimensional transient model for time-domain free-carrier absorption measurement of excess carriers in silicon wafers  

SciTech Connect (OSTI)

A three-dimensional transient model for time-domain (modulated) free-carrier absorption (FCA) measurement was developed to describe the transport dynamics of photo-generated excess carriers in silicon (Si) wafers. With the developed transient model, numerical simulations were performed to investigate the dependences of the waveforms of the transient FCA signals on the electronic transport parameters of Si wafers and the geometric parameters of the FCA experiment. Experimental waveforms of FCA signals of both n- and p-type Si wafers with resistivity ranging 1–38 ?·cm were then fitted to the three-dimensional transient model to extract simultaneously and unambiguously the transport parameters of Si wafers, namely, the carrier lifetime, the carrier diffusion coefficient, and the front surface recombination velocity via multi-parameter fitting. A basic agreement between the extracted parameter values and the literature values was obtained.

Ren, Shengdong; Huang, Qiuping [Institute of Optics and Electronics, Chinese Academy of Sciences, P. O. Box 350, Shuangliu, Chengdu, Sichuan 610209 (China); University of the Chinese Academy of Sciences, Beijing 100039 (China); Li, Bincheng, E-mail: bcli@ioe.ac.cn [Institute of Optics and Electronics, Chinese Academy of Sciences, P. O. Box 350, Shuangliu, Chengdu, Sichuan 610209 (China)

2013-12-28T23:59:59.000Z

432

Three-dimensional two-pion emission source at SPS: Extraction of source breakup time and emission duration  

SciTech Connect (OSTI)

A model-independent, three-dimensional source function for pion pairs has been extracted from Pb + Pb collisions at {radical}s{sub NN} = 17.3 GeV. The extracted source exhibits long-range non-Gaussian tails in the directions of the pion-pair net transverse momentum and of the beam. Comparison with the Therminatormodel allows for an extraction of the pion source proper breakup time and of emission duration in the collisions.

Chung, P., E-mail: pchung@mail.chem.sunysb.ed [Stony Brook University (SUNYSB), Department of Chemistry (United States); Danielewicz, P., E-mail: danielewicz@nscl.msu.ed [Michigan State University, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy (United States)

2008-09-15T23:59:59.000Z

433

Sensitivity analysis of reactivity responses using one-dimensional discrete ordinates and three-dimensional Monte Carlo methods  

SciTech Connect (OSTI)

The TSUNAMI computational sequences currently in the SCALE 5 code system provide an automated approach to performing sensitivity and uncertainty analysis for eigenvalue responses, using either one-dimensional discrete ordinates or three-dimensional Monte Carlo methods. This capability has recently been expanded to address eigenvalue-difference responses such as reactivity changes. This paper describes the methodology and presents results obtained for an example advanced CANDU reactor design. (authors)

Williams, M. L.; Gehin, J. C.; Clarno, K. T. [Oak Ridge National Laboratory, Bldg. 5700, P.O. Box 2008, Oak Ridge, TN 37831-6170 (United States)

2006-07-01T23:59:59.000Z

434

Three-dimensional liver motion tracking using real-time two-dimensional MRI  

SciTech Connect (OSTI)

Purpose: Combined magnetic resonance imaging (MRI) systems and linear accelerators for radiotherapy (MR-Linacs) are currently under development. MRI is noninvasive and nonionizing and can produce images with high soft tissue contrast. However, new tracking methods are required to obtain fast real-time spatial target localization. This study develops and evaluates a method for tracking three-dimensional (3D) respiratory liver motion in two-dimensional (2D) real-time MRI image series with high temporal and spatial resolution. Methods: The proposed method for 3D tracking in 2D real-time MRI series has three steps: (1) Recording of a 3D MRI scan and selection of a blood vessel (or tumor) structure to be tracked in subsequent 2D MRI series. (2) Generation of a library of 2D image templates oriented parallel to the 2D MRI image series by reslicing and resampling the 3D MRI scan. (3) 3D tracking of the selected structure in each real-time 2D image by finding the template and template position that yield the highest normalized cross correlation coefficient with the image. Since the tracked structure has a known 3D position relative to each template, the selection and 2D localization of a specific template translates into quantification of both the through-plane and in-plane position of the structure. As a proof of principle, 3D tracking of liver blood vessel structures was performed in five healthy volunteers in two 5.4 Hz axial, sagittal, and coronal real-time 2D MRI series of 30 s duration. In each 2D MRI series, the 3D localization was carried out twice, using nonoverlapping template libraries, which resulted in a total of 12 estimated 3D trajectories per volunteer. Validation tests carried out to support the tracking algorithm included quantification of the breathing induced 3D liver motion and liver motion directionality for the volunteers, and comparison of 2D MRI estimated positions of a structure in a watermelon with the actual positions. Results: Axial, sagittal, and coronal 2D MRI series yielded 3D respiratory motion curves for all volunteers. The motion directionality and amplitude were very similar when measured directly as in-plane motion or estimated indirectly as through-plane motion. The mean peak-to-peak breathing amplitude was 1.6 mm (left-right), 11.0 mm (craniocaudal), and 2.5 mm (anterior-posterior). The position of the watermelon structure was estimated in 2D MRI images with a root-mean-square error of 0.52 mm (in-plane) and 0.87 mm (through-plane). Conclusions: A method for 3D tracking in 2D MRI series was developed and demonstrated for liver tracking in volunteers. The method would allow real-time 3D localization with integrated MR-Linac systems.

Brix, Lau, E-mail: lau.brix@stab.rm.dk [Department of Procurement and Clinical Engineering, Region Midt, Olof Palmes Allé 15, 8200 Aarhus N, Denmark and MR Research Centre, Aarhus University Hospital, Skejby, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark)] [Department of Procurement and Clinical Engineering, Region Midt, Olof Palmes Allé 15, 8200 Aarhus N, Denmark and MR Research Centre, Aarhus University Hospital, Skejby, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark); Ringgaard, Steffen [MR Research Centre, Aarhus University Hospital, Skejby, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark)] [MR Research Centre, Aarhus University Hospital, Skejby, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark); Sørensen, Thomas Sangild [Department of Computer Science, Aarhus University, Aabogade 34, 8200 Aarhus N, Denmark and Department of Clinical Medicine, Aarhus University, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark)] [Department of Computer Science, Aarhus University, Aabogade 34, 8200 Aarhus N, Denmark and Department of Clinical Medicine, Aarhus University, Brendstrupgaardsvej 100, 8200 Aarhus N (Denmark); Poulsen, Per Rugaard [Department of Clinical Medicine, Aarhus University, Brendstrupgaardsvej 100, 8200 Aarhus N, Denmark and Department of Oncology, Aarhus University Hospital, Nørrebrogade 44, 8000 Aarhus C (Denmark)] [Department of Clinical Medicine, Aarhus University, Brendstrupgaardsvej 100, 8200 Aarhus N, Denmark and Department of Oncology, Aarhus University Hospital, Nørrebrogade 44, 8000 Aarhus C (Denmark)

2014-04-15T23:59:59.000Z

435

THE ANGULAR MOMENTUM OF MAGNETIZED MOLECULAR CLOUD CORES: A TWO-DIMENSIONAL-THREE-DIMENSIONAL COMPARISON  

SciTech Connect (OSTI)

In this work, we present a detailed study of the rotational properties of magnetized and self-gravitating dense molecular cloud (MC) cores formed in a set of two very high resolution three-dimensional (3D) MC simulations with decaying turbulence. The simulations have been performed using the adaptative mesh refinement code RAMSES with an effective resolution of 4096{sup 3} grid cells. One simulation represents a mildly magnetically supercritical cloud and the other a strongly magnetically supercritical cloud. We identify dense cores at a number of selected epochs in the simulations at two density thresholds which roughly mimic the excitation densities of the NH{sub 3} (J - K) = (1,1) transition and the N{sub 2}H{sup +} (1-0) emission line. A noticeable global difference between the two simulations is the core formation efficiency (CFE) of the high-density cores. In the strongly supercritical simulations, the CFE is 33% per unit free-fall time of the cloud (t{sub ff,cl}), whereas in the mildly supercritical simulations this value goes down to {approx}6 per unit t{sub ff,cl}. A comparison of the intrinsic specific angular momentum (j{sub 3D}) distributions of the cores with the specific angular momentum derived using synthetic two-dimensional (2D) velocity maps of the cores (j{sub 2D}) shows that the synthetic observations tend to overestimate the true value of the specific angular momentum by a factor of {approx}8-10. We find that the distribution of the ratio j{sub 3D}/j{sub 2D} of the cores peaks at around {approx}0.1. The origin of this discrepancy lies in the fact that contrary to the intrinsic determination of j which sums up the individual gas parcels' contributions to the angular momentum, the determination of the specific angular momentum using the standard observational procedure which is based on a measurement on the global velocity gradient under the hypothesis of uniform rotation smoothes out the complex fluctuations present in the 3D velocity field. Our results may well provide a natural explanation for the discrepancy by a factor of {approx}10 observed between the intrinsic 3D distributions of the specific angular momentum and the corresponding distributions derived in real observations. We suggest that previous and future measurements of the specific angular momentum of dense cores which are based on the measurement of the observed global velocity gradients may need to be reduced by a factor of {approx}10 in order to derive a more accurate estimate of the true specific angular momentum in the cores. We also show that the exponent of the size-specific angular momentum relation is smaller ({approx}1.4) in the synthetic observations than their values derived in the 3D space ({approx}1.8).

Dib, Sami; Csengeri, Timea; Audit, Edouard [Service d'Astrophysique, DSM/Irfu, CEA/Saclay, F-91191, Gif-sur-Yvette Cedex (France); Hennebelle, Patrick [Laboratoire de Radioastronomie, UMR CNRS 8112, Ecole Normale Superieure, Observatoire de Paris, 24 rue Lhomond, 75231 Paris Cedex 05 (France); Pineda, Jaime E.; Goodman, Alyssa A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Bontemps, Sylvain, E-mail: sami.dib@cea.f [CNRS/INU, Laboratoire d'Astrophysique de Bordeaux, UMR 5804, BP 89, 33271, Floirac, Cedex (France)

2010-11-01T23:59:59.000Z

436

Enhanced lithium storage performance in three-dimensional porous SnO2-Fe2O3 composite anode films  

Science Journals Connector (OSTI)

Abstract As one of the most promising anode materials in lithium-ion batteries (LIBs), SnO2 attracts wide research attention. The practical application of SnO2 anodes, however, is mainly hampered by huge volume variation during cycling and large initial irreversible capacity. In this paper, three-dimensional porous SnO2-Fe2O3 composite films have been fabricated using the electrostatic spray deposition technique. As an anode for LIBs, the hierarchical porous SnO2-Fe2O3 film possesses a high reversible capacity (1034.1 mAh g-1) and a high initial Coulombic efficiency of 82.9% at a current density of 0.2 A g-1. At the same time, it shows good capacity retention with a capacity of 1025.6 mAh g-1 after 240 cycles and excellent rate performance. The enhanced lithium storage performance should be attributed to the synergistic effect between SnO2 and Fe2O3, as well as the three-dimensional hierarchical porous structure. The results demonstrate that such a three-dimensional porous composite anode shows great potential for application in high-energy lithium-ion batteries.

Tianzhi Yuan; Yinzhu Jiang; Yong Li; Dan Zhang; Mi Yan

2014-01-01T23:59:59.000Z

437

Three-dimensional fracture and fragmentation of artificial kidney stones This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network [OSTI]

Three-dimensional fracture and fragmentation of artificial kidney stones This article has been IOPscience #12;Three-dimensional fracture and fragmentation of artificial kidney stones Alejandro Mota1 Laboratory Livermore, CA 94550, USA July 25, 2006 Abstract The brittle fracture of a gypsum cylinder, which

Ortiz, Michael

438

Seismicity Maps  

Science Journals Connector (OSTI)

...density, highly porous airborne vol- canic ejecta near...explosions for such stress-release experiments cannot be...a)+e2 /7 f is the fraction of stress drop and a...Steinbrugge Pacific Fire Rating Bureau San Francisco...fault belt without the release of seismic energy. Hence...

439

Fast History Matching of Time-Lapse Seismic and Production-Data for High Resolution Models  

E-Print Network [OSTI]

(e.g. porosity, permeability). More recently, the availability of repeated seismic surveys over the time scale of years (i.e., 4D seismic) has shown promising results for the qualitative determination of changes in fluid phase distributions...

Rey Amaya, Alvaro

2012-10-19T23:59:59.000Z

440

Scaring Effects in Fish and Harmful Effects on Eggs, Larvae and Fry by Offshore Seismic Explorations  

Science Journals Connector (OSTI)

A co-operating survey between a seismic vessel and a research vessel took place ... . Changes of the behaviour patterns of the fish along the course lines of the seismic vessel from immediately before to just aft...

John Dalen; Geir Magne Knutsen

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Advanced Seismic While Drilling System  

SciTech Connect (OSTI)

A breakthrough has been discovered for controlling seismic sources to generate selectable low frequencies. Conventional seismic sources, including sparkers, rotary mechanical, hydraulic, air guns, and explosives, by their very nature produce high-frequencies. This is counter to the need for long signal transmission through rock. The patent pending SeismicPULSER{trademark} methodology has been developed for controlling otherwise high-frequency seismic sources to generate selectable low-frequency peak spectra applicable to many seismic applications. Specifically, we have demonstrated the application of a low-frequency sparker source which can be incorporated into a drill bit for Drill Bit Seismic While Drilling (SWD). To create the methodology of a controllable low-frequency sparker seismic source, it was necessary to learn how to maximize sparker efficiencies to couple to, and transmit through, rock with the study of sparker designs and mechanisms for (a) coupling the sparker-generated gas bubble expansion and contraction to the rock, (b) the effects of fluid properties and dynamics, (c) linear and non-linear acoustics, and (d) imparted force directionality. After extensive seismic modeling, the design of high-efficiency sparkers, laboratory high frequency sparker testing, and field tests were performed at the University of Texas Devine seismic test site. The conclusion of the field test was that extremely high power levels would be required to have the range required for deep, 15,000+ ft, high-temperature, high-pressure (HTHP) wells. Thereafter, more modeling and laboratory testing led to the discovery of a method to control a sparker that could generate low frequencies required for deep wells. The low frequency sparker was successfully tested at the Department of Energy Rocky Mountain Oilfield Test Center (DOE RMOTC) field test site in Casper, Wyoming. An 8-in diameter by 26-ft long SeismicPULSER{trademark} drill string tool was designed and manufactured by TII. An APS Turbine Alternator powered the SeismicPULSER{trademark} to produce two Hz frequency peak signals repeated every 20 seconds. Since the ION Geophysical, Inc. (ION) seismic survey surface recording system was designed to detect a minimum downhole signal of three Hz, successful performance was confirmed with a 5.3 Hz recording with the pumps running. The two Hz signal generated by the sparker was modulated with the 3.3 Hz signal produced by the mud pumps to create an intense 5.3 Hz peak frequency signal. The low frequency sparker source is ultimately capable of generating selectable peak frequencies of 1 to 40 Hz with high-frequency spectra content to 10 kHz. The lower frequencies and, perhaps, low-frequency sweeps, are needed to achieve sufficient range and resolution for realtime imaging in deep (15,000 ft+), high-temperature (150 C) wells for (a) geosteering, (b) accurate seismic hole depth, (c) accurate pore pressure determinations ahead of the bit, (d) near wellbore diagnostics with a downhole receiver and wired drill pipe, and (e) reservoir model verification. Furthermore, the pressure of the sparker bubble will disintegrate rock resulting in an increased overall rates of penetration. Other applications for the SeismicPULSER{trademark} technology are to deploy a low-frequency source for greater range on a wireline for Reverse Vertical Seismic Profiling (RVSP) and Cross-Well Tomography. Commercialization of the technology is being undertaken by first contacting stakeholders to define the value proposition for rig site services utilizing SeismicPULSER{trademark} technologies. Stakeholders include national oil companies, independent oil companies, independents, service companies, and commercial investors. Service companies will introduce a new Drill Bit SWD service for deep HTHP wells. Collaboration will be encouraged between stakeholders in the form of joint industry projects to develop prototype tools and initial field trials. No barriers have been identified for developing, utilizing, and exploiting the low-frequency SeismicPULSER{trademark} source in a

Robert Radtke; John Fontenot; David Glowka; Robert Stokes; Jeffery Sutherland; Ron Evans; Jim Musser

2008-06-30T23:59:59.000Z

442

Three-dimensional Kirchhoff-approximate generalized Radon transform imaging using teleseismic P-to-S scattered waves  

Science Journals Connector (OSTI)

......dense profiles, for example the Colorado Plateau/Rio Grande Rift Seismic...Starting 12 Ma, extensive eruption of flood basalt near the Owhyee Plateau resulted...Great Plains, Rio Grande Rift, and Colorado Plateau using receiver functions......

Kaijian Liu; Alan Levander

2013-01-01T23:59:59.000Z

443

Conditional Moment Closure Modeling for a Three-Dimensional Turbulent Non-premixed Syngas Flame with a Cooling Wall  

Science Journals Connector (OSTI)

Conditional Moment Closure Modeling for a Three-Dimensional Turbulent Non-premixed Syngas Flame with a Cooling Wall ... In the experiment,(13) the burner is mounted to an air-cooled combustion chamber and the burner consists of a central fuel tube and an annular air tube. ... It can be seen that the velocity field at the pure-mixing entrance region is highly deflected by the flame holder, and the burned mixtures are partially impinged on the cooling wall (Tw = 600 K). ...

Gunhong Kim; Sungmo Kang; Yongmo Kim; Kwan-Soo Lee

2008-09-13T23:59:59.000Z

444

Three-dimensional numerical simulation of settling and resuspension of solids in storage tanks with air injection recirculators  

SciTech Connect (OSTI)

Transient three-dimensional finite-difference numerical modeling of flow with settling solids in a 3.7 x 10/sup 3/ m/sup 3/ tank was performed. The number-average diameter of the particles was 15..mu..m and nominal volumetric concentration was 24 percent. Using dilute suspension, concentration dependent viscosity, and settling velocity assumption, modeled air lift circulators were shown to be sufficient to maintain solids in suspension during normal operation. Resuspension of solids was also shown to be accomplished by impulsive circulator startup in the absence of particle agglomeration. Settling velocity was shown to be a dominant parameter under the assumptions made.

Eyler, L.L.

1984-01-01T23:59:59.000Z

445

Complex-shaped three-dimensional microstructures and photonic crystals generated in a polysiloxane polymer by two-photon microstereolithography  

Science Journals Connector (OSTI)

Two-photon photopolymerization of inorganic–organic hybrid materials permits the generation of complex-shaped three-dimensional microstructures at submicrometer resolution of structural elements. Due to their favorable optical, chemical and thermal properties these materials are particularly useful for photonic microdevice fabrication. Focussing ultrashort pulsed visible light into a modified commercially available polysiloxane polymer a Sydney Opera House design and a series of woodpile-type photonic crystals were fabricated. Fourier transform infrared spectroscopy revealed photonic stop gaps in the stacking direction at wavelengths varying from 6 to 4 ?m upon reduction of the woodpile rod size. The structures allowed for the observation of higher-order stop gaps.

M. Straub; L.H. Nguyen; A. Fazlic; M. Gu

2004-01-01T23:59:59.000Z

446

Physical modeling and numerical simulation of subcooled boiling in one- and three-dimensional representation of bundle geometry  

SciTech Connect (OSTI)

Numerical simulation of subcooled boiling in one-dimensional geometry with the Homogeneous Equilibrium Model (HEM) may yield difficulties related to the very low sonic velocity associated with the HEM. These difficulties do not arise with subcritical flow. Possible solutions of the problem include introducing a relaxation of the vapor production rate. Three-dimensional simulations of subcooled boiling in bundle geometry typical of fast reactors can be performed by using two systems of conservation equations, one for the HEM and the other for a Separated Phases Model (SPM), with a smooth transition between the two models.

Bottoni, M.; Lyczkowski, R.; Ahuja, S.

1995-07-01T23:59:59.000Z

447

Ubiquity of chaotic magnetic-field lines generated by three-dimensionally crossed wires in modern electric circuits  

Science Journals Connector (OSTI)

We investigate simple three-dimensionally crossed wires carrying electric currents which generate chaotic magnetic-field lines (CMFLs). As such wire systems, cross-ring and perturbed parallel-ring wires are studied, since topologically equivalent configurations to these systems can often be found in contemporary electric and integrated circuits. For realistic fundamental wire configurations, the conditions for wire dimensions (size) and current values to generate CMFLs are numerically explored under the presence of the weak but inevitable geomagnetic field. As a result, it is concluded that CMFLs can exist everywhere; i.e., they are ubiquitous in the modern technological world.

M. Hosoda; T. Miyaguchi; K. Imagawa; K. Nakamura

2009-12-21T23:59:59.000Z

448

NUMERICAL SIMULATION OF THREE-DIMENSIONAL ASYMMETRIC RECONNECTION AND APPLICATION TO A PHYSICAL MECHANISM OF PENUMBRAL MICROJETS  

SciTech Connect (OSTI)

Three-dimensional (3D) component reconnection, where reconnecting field lines are not perfectly anti-parallel, is studied with a 3D magnetohydrodynamic simulation. In particular, we consider the asymmetry of the field strength of the reconnecting field lines. As the asymmetry increases, the generated reconnection jet tends to be parallel to stronger field lines. This is because weaker field lines have higher gas pressure in the initial equilibrium, and hence the gas pressure gradient along the reconnected field lines is generated, which accelerates the field-aligned plasma flow. This mechanism may explain penumbral microjets and other types of jets that are parallel to magnetic field lines.

Nakamura, Naoki [Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502 (Japan); Shibata, Kazunari [Kwaan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8471 (Japan); Isobe, Hiroaki, E-mail: nakamura@kwasan.kyoto-u.ac.jp, E-mail: shibata@kwasan.kyoto-u.ac.jp, E-mail: isobe@kwasan.kyoto-u.ac.jp [Unit of Synergetic Studies for Space, Kyoto University, Yamashina, Kyoto 607-8471 (Japan)

2012-12-20T23:59:59.000Z

449

Hydrodynamic Behavior of a Filter-Press Electrochemical Reactor with Carbon Felt As a Three-Dimensional Electrode  

Science Journals Connector (OSTI)

This influence has been studied through an application of this kind of electrode in the Fe/Cr redox flow battery. ... 18,19 The Fe/Cr redox flow battery is an electrical energy storage system based on the redox process: The use of three-dimensional electrodes (carbon felts) in a redox flow battery will increase the value of the charging and discharging velocity. ... The state of charge of the Fe/Cr redox flow battery is given by the state of charge of the solutions that constitute it (Fe3+/Fe2+ and Cr3+/Cr2+). ...

José González-García; Vicente Montiel; Antonio Aldaz; Juan A. Conesa; José R. Pérez; Guillermo Codina

1998-09-24T23:59:59.000Z

450

Three-dimensional manipulation of electron beam phase space for seeding soft x-ray free-electron lasers  

E-Print Network [OSTI]

In this letter, a simple technique is proposed to induce strong density modulation into the electron beam with small energy modulation. By using the combination of a transversely dispersed electron beam and a wave-front tilted seed laser, three-dimensional manipulation of the electron beam phase space can be utilized to significantly enhance the micro-bunching of seeded free-electron laser schemes, which will improve the performance and extend the short-wavelength range of a single-stage seeded free-electron laser. Theoretical analysis and numerical simulations demonstrate the capability of the proposed technique in a soft x-ray free-electron laser.

Feng, Chao; Deng, Haixiao; Zhao, Zhentang

2014-01-01T23:59:59.000Z

451

Use of a temporal approach to the three-dimensional image formation of a distant rough nonplanar object  

SciTech Connect (OSTI)

A method is proposed to reconstruct three-dimensional images of a distant nonplanar rough object by the speckle pattern of its flat image, which is calculated using the temporal approach based on the time correlation function of probe radiation with a coherence length smaller than the size of the probed object. We analyse the influence of the angular resolution of the optical system, forming an image of the object, and additive noises on the reconstruction accuracy of the object surface shape using the proposed method. (imaging)

Mandrosov, V I [Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow Region (Russian Federation)

2011-02-28T23:59:59.000Z

452

Three-Dimensional Two-Pion Emission Source at SPS: Extraction of Source Breakup Time and Emission Duration  

E-Print Network [OSTI]

A model-independent, three-dimensional source function for pion pairs has been extracted from Pb+Pb collisions at $\\sqrt s_{NN}=17.3$ AGeV. The extracted sourc e exhibits long-range non-Gaussian tails in the directions of the pion-pair net transverse-momentum and of the beam. Comparison with the Therminator model allow s for an extraction of the pion source proper breakup time and of emission durat ion in the collisions.

P. Chung; P. Danielewicz

2008-07-30T23:59:59.000Z

453

Comparisons of computed and measured three-dimensional velocity fields in a motored two-stroke engine  

SciTech Connect (OSTI)

Computer simulations are compared with measurements of the three-dimensional, unsteady scavenging flows of a motored two-stroke engine. Laser Doppler velocimetry measurements were made on a modified Suzuki DT-85 ported engine. Calculations were performed using KIVA-3, a computer program that efficiently solves the intake and exhaust port flows along with those in the cylinder. Measured and computed cylinder pressures and velocities are compared. Pressures agree well over the cycle as do the velocities at the intake ports. In-cylinder velocities differ in detail, but the tumbling motion in the cylinder is well replicated in vertical plane passing through the cylinder axis. 20 refs., 7 figs., 3 tabs.

Amsden, A.A.; O'Rourke, P.J.; Butler, T.D. (Los Alamos National Lab., NM (United States)); Meintjes, K.; Fansler, T.D. (General Motors Research Labs., Warren, MI (United States))

1991-01-01T23:59:59.000Z

454

Seismic Array Software System  

E-Print Network [OSTI]

Seismic Array Software System Sam Irvine, Martin Lukac,of a Portable Broadband Seismic Array Long - • Part of theStudy the propagation of seismic waves in Mexico City • Line

2005-01-01T23:59:59.000Z

455

Analysis of photonic band gap in dispersive properties of tunable three-dimensional photonic crystals doped by magnetized plasma  

SciTech Connect (OSTI)

In this paper, the magnetooptical effects in dispersive properties for two types of three-dimensional magnetized plasma photonic crystals (MPPCs) containing homogeneous dielectric and magnetized plasma with diamond lattices are theoretically investigated for electromagnetic (EM) wave based on plane wave expansion (PWE) method, as incidence EM wave vector is parallel to the external magnetic field. The equations for two types of MPPCs with diamond lattices (dielectric spheres immersed in magnetized plasma background or vice versa) are theoretically deduced. The influences of dielectric constant, plasma collision frequency, filling factor, the external magnetic field, and plasma frequency on the dispersive properties for both types of structures are studied in detail, respectively, and some corresponding physical explanations are also given. From the numerical results, it has been shown that the photonic band gaps (PBGs) for both types of MPPCs can be manipulated by plasma frequency, filling factor, the external magnetic field, and the relative dielectric constant of dielectric, respectively. Especially, the external magnetic field can enlarge the PBG for type-2 structure (plasma spheres immersed in dielectric background). However, the plasma collision frequency has no effect on the dispersive properties of two types of three-dimensional MPPCs. The locations of flatbands regions for both types of structures cannot be tuned by any parameters except for plasma frequency and the external magnetic field. The analytical results may be informative and of technical use to design the MPPCs devices.

Zhang HaiFeng [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Nanjing Artillery Academy, Nanjing 211132 (China); Liu Shaobin; Yang Huan [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Kong Xiangkun [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science and Technology, Nanjing 210044 (China)

2013-03-15T23:59:59.000Z

456

The properties of photonic band gaps for three-dimensional plasma photonic crystals in a diamond structure  

SciTech Connect (OSTI)

In this paper, the properties of photonic band gaps (PBGs) for two types of three-dimensional plasma photonic crystals (PPCs) composed of isotropic dielectric and unmagnetized plasma with diamond lattices are theoretically investigated for electromagnetic waves based on a modified plane wave expansion method. The equations for type-1 structure are theoretically deduced, which depend on the diamond lattices realization (dielectric spheres immersed in plasma background). The influences of dielectric constant of dielectric, plasma collision frequency, filling factor, and plasma frequency on PBGs are investigated, respectively, and some corresponding physical explanations and the possible methods to realize the three-dimensional PPCs in experiments are also given. From the numerical results, it has been shown that not only the locations but also the gap/midgap ratios of the PBGs for two types of PPCs can be tuned by plasma frequency, filling factor, and the relative dielectric constant, respectively. However, the plasma collision frequency has no effect on the frequency ranges and gap/midgap ratios of the PBGs for two types of PPCs.

Zhang Haifeng [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Nanjing Artillery Academy, Nanjing 211132 (China); Liu Shaobin [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); State Key Laboratory of Millimeter Waves of Southeast University, Nanjing Jiangsu 210096 (China); Kong Xiangkun, Chenchen; Bian Borui [College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China)

2013-04-15T23:59:59.000Z

457

THREE-DIMENSIONAL STRUCTURE AND EVOLUTION OF EXTREME-ULTRAVIOLET BRIGHT POINTS OBSERVED BY STEREO/SECCHI/EUVI  

SciTech Connect (OSTI)

We unveil the three-dimensional structure of quiet-Sun EUV bright points and their temporal evolution by applying a triangulation method to time series of images taken by SECCHI/EUVI on board the STEREO twin spacecraft. For this study we examine the heights and lengths as the components of the three-dimensional structure of EUV bright points and their temporal evolutions. Among them we present three bright points which show three distinct changes in the height and length: decreasing, increasing, and steady. We show that the three distinct changes are consistent with the motions (converging, diverging, and shearing, respectively) of their photospheric magnetic flux concentrations. Both growth and shrinkage of the magnetic fluxes occur during their lifetimes and they are dominant in the initial and later phases, respectively. They are all multi-temperature loop systems which have hot loops ({approx}10{sup 6.2} K) overlying cooler ones ({approx}10{sup 6.0} K) with cool legs ({approx}10{sup 4.9} K) during their whole evolutionary histories. Our results imply that the multi-thermal loop system is a general character of EUV bright points. We conclude that EUV bright points are flaring loops formed by magnetic reconnection and their geometry may represent the reconnected magnetic field lines rather than the separator field lines.

Kwon, Ryun-Young; Poomvises, Watanachak [Department of Physics, Institute for Astrophysics and Computational Sciences, Catholic University of America, 620 Michigan Avenue, Washington, DC 20064 (United States); Chae, Jongchul [Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul (Korea, Republic of); Davila, Joseph M.; Jones, Shaela I. [NASA Goddard Space Flight Center, Solar Physics Laboratory, Code 671, Greenbelt, MD 20771 (United States); Zhang Jie [School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, VA 22030 (United States); Moon, Yong-Jae, E-mail: ryunyoung.kwon@nasa.gov [School of Space Research, Kyung Hee University, Yongin 446-701 (Korea, Republic of)

2012-10-01T23:59:59.000Z

458

Heterogeneous slip and rupture models of the San Andreas fault zone based upon three-dimensional earthquake tomography  

SciTech Connect (OSTI)

Crystal fault zones exhibit spatially heterogeneous slip behavior at all scales, slip being partitioned between stable frictional sliding, or fault creep, and unstable earthquake rupture. An understanding the mechanisms underlying slip segmentation is fundamental to research into fault dynamics and the physics of earthquake generation. This thesis investigates the influence that large-scale along-strike heterogeneity in fault zone lithology has on slip segmentation. Large-scale transitions from the stable block sliding of the Central 4D Creeping Section of the San Andreas, fault to the locked 1906 and 1857 earthquake segments takes place along the Loma Prieta and Parkfield sections of the fault, respectively, the transitions being accomplished in part by the generation of earthquakes in the magnitude range 6 (Parkfield) to 7 (Loma Prieta). Information on sub-surface lithology interpreted from the Loma Prieta and Parkfield three-dimensional crustal velocity models computed by Michelini (1991) is integrated with information on slip behavior provided by the distributions of earthquakes located using, the three-dimensional models and by surface creep data to study the relationships between large-scale lithological heterogeneity and slip segmentation along these two sections of the fault zone.

Foxall, W.

1992-11-01T23:59:59.000Z

459

FEM3C, An improved three-dimensional heavy-gas dispersion model: User`s manual  

SciTech Connect (OSTI)

FEM3C is another upgraded version of FEM3 (a three-dimensional Finite Element Model), which was developed primarily for simulating the atmospheric dispersion of heavier-than-air gas (or heavy gas) releases, based on solving the fully three-dimensional, time-dependent conservation equations of mass, momentum, energy, and species of an inert gas or a pollutant in the form of vapor/droplets. A generalized anelastic approximation, together with the ideal gas law for the density of the gas/air mixture, is invoked to preclude sound waves and allow large density variations in both space and time. Thee numerical algorithm utilizes a modified Galerkin finite element method to discretize spatially the time-dependent conservation equations of mass, momentum, energy, and species. A consistent pressure Poisson equation is formed and solved separately from the time-dependent equations, which are sequentially solved and integrated in time via a modified forward Euler method. The model can handle instantaneous source, finite-duration, and continuous releases. Also, it is capable of treating terrain and obstructions. Besides a K-theory model using similarity functions, an advanced turbulence model based on solving the k - {var_epsilon} transport equations is available as well. Imbedded in the code are also options for solving the Boussinesq equations. In this report, an overview of the model is given, user`s guides for using the model are provided, and example problems are presented to illustrate the usage of the model.

Chan, S.T.

1994-03-01T23:59:59.000Z

460

Effect of pregestational diabetes mellitus on first trimester placental characteristics: Three-dimensional placental volume and power Doppler indices  

Science Journals Connector (OSTI)

AbstractObjective To investigate whether pregestational diabetes mellitus (DM) induces changes in vascular placental development detectable at first trimester. Methods This was a prospective case–control study in 69 women with pregestational DM and 94 controls undergoing first-trimester combined screening for aneuploidies. Maternal characteristics, fetal nuchal translucency thickness, maternal serum pregnancy-associated plasma protein A (PAPP-A) and free ? human chorionic gonadotrophin (?-hCG) were evaluated. Three-dimensional ultrasound was used to measure placental volume and three dimensional power Doppler (3D-PD) placental vascular indices including: vascularization index (VI), flow index (FI) and vascularization flow index (VFI). Pregnancy-associated hypertensive complications (PAHC) and perinatal outcomes were analyzed. The total group of diabetic women and the group of diabetic women without PAHC were compared separately with the control group. Results 3D-PD placental vascular indexes were significantly lower in women with DM than in controls (VI p = 0.007, FI p = 0.003 and VFI p = 0.04). These differences remained on excluding cases with PAHC in the DM group. No differences were found in placental volumes between the DM group and controls. Serum PAPP-A levels were also lower in diabetic women (p effect is independent of the later development of PAHC.

N.L. Gonzalez Gonzalez; E. Gonzalez Davila; A. Castro; E. Padron; W. Plasencia

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Three-Dimensional Spectral Classification of Low-Metallicity Stars Using Artificial Neural Networks  

E-Print Network [OSTI]

We explore the application of artificial neural networks (ANNs) for the estimation of atmospheric parameters (Teff, logg, and [Fe/H]) for Galactic F- and G-type stars. The ANNs are fed with medium-resolution (~ 1-2 A) non flux-calibrated spectroscopic observations. From a sample of 279 stars with previous high-resolution determinations of metallicity, and a set of (external) estimates of temperature and surface gravity, our ANNs are able to predict Teff with an accuracy of ~ 135-150 K over the range 4250 <= Teff <= 6500 K, logg with an accuracy of ~ 0.25-0.30 dex over the range 1.0 <= logg <= 5.0 dex, and [Fe/H] with an accuracy ~ 0.15-0.20 dex over the range -4.0 <= [Fe/H] <= +0.3. Such accuracies are competitive with the results obtained by fine analysis of high-resolution spectra. It is noteworthy that the ANNs are able to obtain these results without consideration of photometric information for these stars. We have also explored the impact of the signal-to-noise ratio (S/N) on the behavior of ANNs, and conclude that, when analyzed with ANNs trained on spectra of commensurate S/N, it is possible to extract physical parameter estimates of similar accuracy with stellar spectra having S/N as low as 13. Taken together, these results indicate that the ANN approach should be of primary importance for use in present and future large-scale spectroscopic surveys.

Shawn Snider; Carlos Allende Prieto; Ted von Hippel; Timothy C. Beers; Christopher Sneden; Yuan Qu; and Silvia Rossi

2001-07-20T23:59:59.000Z

462

EMSP Project Number 65015 Final Report: Three-dimensional position-sensitive germanium detectors  

SciTech Connect (OSTI)

Critical to the DOE effort to deactivate and decommission the weapons complex facilities is the characterization of contaminated equipment and building structures. This characterization includes the isotopic identification of radioactive contaminants and the spatial mapping of these deposits. The penetrating nature of the gamma rays emitted by the radioactive contaminants provides a means to accomplish this task in a passive, non-destructive and non-intrusive manner. Through conventional gamma-ray spectroscopy, the radioactive isotopes in the contaminants can be identified by their characteristic gamma-ray signatures and the amount of each isotope by the intensity of the signature emission. With the addition of gamma-ray imaging, the spatial distributions of the isotopes can simultaneously be obtained. The ability to image radioactive contaminants can reduce waste as well as help ensure the adequate protection of workers and the environment. For example, if equipment and building materials have been subjected to radionuclide contamination, the entire structure must be treated as radioactive waste during demolition. However, only partial removal may be necessary if the contamination can be accurately located and identified. Hand-held survey instrumentation operated in the near vicinity of the contaminated objects is a common method to accomplish this task. This method necessitates long data acquisition times, direct close access, and considerable worker exposure, as well as leads to imprecise information. In contrast, imaging devices operated at a distance from the contaminated objects can accurately acquire the spatially dependent gamma-ray emission information in a single measurement. Consequently, the devices can more efficiently discriminate between contaminated and non-contaminated areas of heterogeneous objects while at the same time reducing worker exposure.

Amman, Mark; Luke, Paul N.

2001-12-07T23:59:59.000Z

463

Three-dimensional Monte Carlo calculations of the neutron and. gamma. -ray fluences in the TFTR diagnostic basement and comparisons with measurements  

SciTech Connect (OSTI)

Realistic calculations of the neutron and ..gamma..-ray fluences in the TFTR diagnostic basement have been carried out with three-dimensional Monte Carlo models. Comparisons with measurements show that the results are well within the experimental uncertainties.

Liew, S.L.; Ku, L.P.; Kolibal, J.G.

1985-10-01T23:59:59.000Z

464

Three-dimensional analysis of fluid flow and heat transfer in single- and two-layered micro-channel heat sinks  

Science Journals Connector (OSTI)

A three-dimensional numerical analysis of laminar fluid flow and conjugate heat transfer has been conducted for single- and two-layered micro-channel heat sinks. The validity of the numerical model ... power, the...

M. L.-J. Levac; H. M. Soliman; S. J. Ormiston

2011-11-01T23:59:59.000Z

465

Nanoimprinting over topography and multilayer three-dimensional printing Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, Michigan 48109  

E-Print Network [OSTI]

-dimensional 3D structures using NIL is the difficulty to imprint on nonflat surfaces. Previous efforts to solveNanoimprinting over topography and multilayer three-dimensional printing L.-R. Bao Department

George, Steven C.

466

Three-dimensional flow near the flapping wings D. Kolomenskiy,1, 2, H. K. Moffatt,2 M. Farge,3 and K. Schneider1, 4  

E-Print Network [OSTI]

-dimensional effects [1]. Obviously, they are also relevant to insect-like flying robots. The three hairpins typical for flows past three-dimensional bluff bodies like spheres or disks. It is straightforward

�cole Normale Supérieure

467

The three-dimensional evolution of ion-scale current sheets: tearing and drift-kink instabilities in the presence of proton temperature anisotropy  

E-Print Network [OSTI]

We present the first three-dimensional hybrid simulations of the evolution of ion-scale current sheets, with an investigation of the role of temperature anisotropy and associated kinetic instabilities on the growth of the tearing instability and particle heating. We confirm the ability of the ion cyclotron and firehose instabilities to enhance or suppress reconnection, respectively. The simulations demonstrate the emergence of persistent three-dimensional structures, including patchy reconnection sites and the fast growth of a narrow-band drift-kink instability, which suppresses reconnection for thin current sheets with weak guide fields. Potential observational signatures of the three-dimensional evolution of solar wind current sheets are also discussed. We conclude that kinetic instabilities, arising from non-Maxwellian ion populations, are significant to the evolution of three-dimensional current sheets, and two-dimensional studies of heating rates by reconnection may therefore over-estimate the ability of...

Gingell, Peter; Matteini, Lorenzo

2014-01-01T23:59:59.000Z

468

Parameterization of meander-belt elements in high-resolution three-dimensional seismic data using the GeoTime cube  

E-Print Network [OSTI]

study of a fluvio-estuarine reservoir from Suriname demonstrates how fluvial point bars, channel fills

van Vliet, Lucas J.

469

Three-dimensional seismic structure and moment tensors of non-double-couple earthquakes at the Hengill–Grensdalur volcanic complex, Iceland  

Science Journals Connector (OSTI)

......as hot but solidified intrusions that fuel the geothermal area above. The currently...disks. Power was provided by lead-acid batteries. Two triggering digital stations of the...walked 1700km, many of them carrying 25kg batteries in addition to disks and spares. Figure......

A. D. Miller; B. R. Julian; G. R. Foulger

1998-05-01T23:59:59.000Z

470

Three-dimensional seismic structure and moment tensors of non-double-couple earthquakes at the Hengill–Grensdalur volcanic complex, Iceland  

Science Journals Connector (OSTI)

......potentially useful for geothermal exploration. In the...of the prohibitive cost of digital radio transmitters...25000(Hengill, Geothermal, Alteration and Groundwater...Surface research of the geothermal area).Nat. Energy Auth., Reykjavik......

A. D. Miller; B. R. Julian; G. R. Foulger

1998-05-01T23:59:59.000Z

471

Procedure to construct three-dimensional models of geothermal areas using seismic noise cross-correlations: application to the Soultz-sous-Forêts enhanced geothermal site  

Science Journals Connector (OSTI)

......improve the existing geothermal power plant and inferences...favourable conditions for geothermal energy development. The opening...structures suitable for geothermal exploration, which...exploitation and the costs are often prohibitive......

Marco Calò; Xavier Kinnaert; Catherine Dorbath

2013-01-01T23:59:59.000Z

472

SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS | Open Energy Information  

Open Energy Info (EERE)

SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: SEISMIC ATTRIBUTES IN GEOTHERMAL FIELDS Details Activities (1) Areas (1) Regions (0) Abstract: Large velocity contrasts are regularly encountered in geothermal fields due to poorly consolidated and hydro-thermally altered rocks. The appropriate processing of seismic data is therefore crucial to delineate the geological structure. To assess the benefits of surface seismic surveys in such settings, we applied different migration procedures to image a synthetic reservoir model and seismic data from the Coso Geothermal Field. We have shown that the two-dimensional migration of synthetic seismic data from a typical reservoir model resolves the geological structure very well

473

Automating Shallow Seismic Imaging  

SciTech Connect (OSTI)

This seven-year, shallow-seismic reflection research project had the aim of improving geophysical imaging of possible contaminant flow paths. Thousands of chemically contaminated sites exist in the United States, including at least 3,700 at Department of Energy (DOE) facilities. Imaging technologies such as shallow seismic reflection (SSR) and ground-penetrating radar (GPR) sometimes are capable of identifying geologic conditions that might indicate preferential contaminant-flow paths. Historically, SSR has been used very little at depths shallower than 30 m, and even more rarely at depths of 10 m or less. Conversely, GPR is rarely useful at depths greater than 10 m, especially in areas where clay or other electrically conductive materials are present near the surface. Efforts to image the cone of depression around a pumping well using seismic methods were only partially successful (for complete references of all research results, see the full Final Technical Report, DOE/ER/14826-F), but peripheral results included development of SSR methods for depths shallower than one meter, a depth range that had not been achieved before. Imaging at such shallow depths, however, requires geophone intervals of the order of 10 cm or less, which makes such surveys very expensive in terms of human time and effort. We also showed that SSR and GPR could be used in a complementary fashion to image the same volume of earth at very shallow depths. The primary research focus of the second three-year period of funding was to develop and demonstrate an automated method of conducting two-dimensional (2D) shallow-seismic surveys with the goal of saving time, effort, and money. Tests involving the second generation of the hydraulic geophone-planting device dubbed the ''Autojuggie'' showed that large numbers of geophones can be placed quickly and automatically and can acquire high-quality data, although not under rough topographic conditions. In some easy-access environments, this device could make SSR surveying considerably more efficient and less expensive, particularly when geophone intervals of 25 cm or less are required. The most recent research analyzed the difference in seismic response of the geophones with variable geophone spike length and geophones attached to various steel media. Experiments investigated the azimuthal dependence of the quality of data relative to the orientation of the rigidly attached geophones. Other experiments designed to test the hypothesis that the data are being amplified in much the same way that an organ pipe amplifies sound have so far proved inconclusive. Taken together, the positive results show that SSR imaging within a few meters of the earth's surface is possible if the geology is suitable, that SSR imaging can complement GPR imaging, and that SSR imaging could be made significantly more cost effective, at least in areas where the topography and the geology are favorable. Increased knowledge of the Earth's shallow subsurface through non-intrusive techniques is of potential benefit to management of DOE facilities. Among the most significant problems facing hydrologists today is the delineation of preferential permeability paths in sufficient detail to make a quantitative analysis possible. Aquifer systems dominated by fracture flow have a reputation of being particularly difficult to characterize and model. At chemically contaminated sites, including U.S. Department of Energy (DOE) facilities and others at Department of Defense (DOD) installations worldwide, establishing the spatial extent of the contamination, along with the fate of the contaminants and their transport-flow directions, is essential to the development of effective cleanup strategies. Detailed characterization of the shallow subsurface is important not only in environmental, groundwater, and geotechnical engineering applications, but also in neotectonics, mining geology, and the analysis of petroleum reservoir analogs. Near-surface seismology is in the vanguard of non-intrusive approaches to increase knowledge of the shallow subsurface; our

Steeples, Don W.

2004-12-09T23:59:59.000Z

474

The influence of winter convection on primary production: a parameterisation using a hydrostatic three-dimensional biogeochemical model  

E-Print Network [OSTI]

In the recent past observational and modelling studies have shown that the vertical displacement of water parcels, and therefore, phytoplankton particles in regions of deep-reaching convection plays a key role in late winter/early spring primary production. The underlying mechanism describes how convection cells capture living phytoplankton cells and recurrently expose them to sunlight. This study presents a parameterisation called `phytoconvection' which focuses on the influence of convection on primary production. This parameterisation was implemented into a three-dimensional physical-biogeochemical model and applied to the Northwestern European Continental Shelf and areas of the adjacent Northeast Atlantic. The simulation was compared to a `conventional' parameterisation with respect to its influence on phytoplankton concentrations during the annual cycle and its effect on the carbon cycle. The simulation using the new parameterisation showed good agreement with observation data recorded during winter, whe...

Große, Fabian; Pätsch, Johannes; Backhaus, Jan O

2014-01-01T23:59:59.000Z

475

Three-dimensional coupled ground water flow, thermal transport and/or migration of nuclides analysis by boundary element method  

SciTech Connect (OSTI)

In the safety analyses of radioactive waste disposal, it is important and indispensable to analyze coupled problems of ground water flow, thermal transport and/or migration of nuclides. The three-dimensional coupled problems is solved by boundary element method in this paper. The results of this method are compared with those experiments of JAERI and STRIPA SWEDEN on the thermal problem, and with those analyses of analytical and FEM results on the migration problem. In this formulation, natural convection is considered by Boussinesq approximation. An example of coupled ground water flow and migration of nuclides with decay chain U{sup 234} {yields} Th{sup 230} {yields} Ra{sup 226} is also tried.

Kawamura, Ryuji [Information and Mathematical Science Lab., Inc., Kanagawa (Japan)

1994-12-31T23:59:59.000Z

476

Impact of screening of resonant magnetic perturbations in three dimensional edge plasma transport simulations for DIII-D  

SciTech Connect (OSTI)

The impact of resonant magnetic perturbations (RMPs) on the plasma edge can be analyzed in detail by three dimensional computer simulations, which take the underlying magnetic field structure as input. Previously, the 'vacuum approximation' has been used to calculate the magnetic field structure although plasma response effects may result in a screening (or even an amplification) of the external perturbations. Simulation results for an ITER similar shape plasma at the DIII-D tokamak are presented for the full vacuum perturbation field and an ad hoc screening case in comparison to the unperturbed configuration. It is shown that the RMP induced helical patterns in the plasma edge and on the divertor target shrink once screening is taken into account. However, a flat temperature profile is still found in the 'open field line domain' inside the separatrix, while the 'density pump out effect' found in the vacuum RMP case is considerably weakened.

Frerichs, H.; Reiter, D.; Schmitz, O. [Institute of Energy and Climate Research-Plasma Physics, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, Partner in the Trilateral Euregio Cluster, Juelich (Germany); Cahyna, P. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Prague (Czech Republic); Evans, T. E. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States); Feng, Y. [Max-Planck Institute for Plasma Physics, Greifswald (Germany); Nardon, E. [Association EURATOM-CEA, IRFM, CEA Cadarache, St-Paul-lez-Durance (France)

2012-05-15T23:59:59.000Z

477

Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture  

E-Print Network [OSTI]

Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. With the new architecture, we demonstrate that Josephson junction qubits are highly coherent, with $T_2 \\sim 10 \\mu$s to $20 \\mu$s without the use of spin echo, and highly stable, showing no evidence for $1/f$ critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few $10^{-4}$, approaching the error correction threshold.

Hanhee Paik; D. I. Schuster; Lev S. Bishop; G. Kirchmair; G. Catelani; A. P. Sears; B. R. Johnson; M. J. Reagor; L. Frunzio; L. Glazman; S. M. Girvin; M. H. Devoret; R. J. Schoelkopf

2011-11-02T23:59:59.000Z

478

Binder-free Ge-three dimensional graphene electrodes for high-rate capacity Li-ion batteries  

SciTech Connect (OSTI)

A binder-free, high-rate Ge-three dimensional (3D) graphene composite was synthesized by directly depositing Ge film atop 3D graphene grown by microwave plasma chemical vapor deposition on Ni substrate. The Ge-3D graphene structure demonstrates excellent electrochemical performance as a lithium ion battery (LIB) anode with a reversible capacity of 1140 mAh g{sup ?1} at 1/3C over 100 cycles and 835 mAh g{sup ?1} at 8C after 60 cycles, and significantly a discharge capacity of 186 mAh g{sup ?1} was still achieved at 32C. The high capacity and outstanding stability of the Ge-3D graphene composite propose it as a promising electrode in high-performance thin film LIBs.

Wang, C. D.; Chui, Y. S.; Chen, X. F., E-mail: xianfeng.chen@cityu.edu.hk, E-mail: apwjzh@cityu.edu.hk; Zhang, W. J., E-mail: xianfeng.chen@cityu.edu.hk, E-mail: apwjzh@cityu.edu.hk [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (China); Li, Y. [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (China) [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (China); Department of Polymer Science and Engineering, Soochow University, Suzhou 215123 (China)

2013-12-16T23:59:59.000Z

479

Three-Dimensional Reconstruction and Microstructure Modeling of Porosity-Graded Cathode Using Focused Ion Beam and Homogenization Techniques  

SciTech Connect (OSTI)

In this study, microstructure of a porosity-graded lanthanum strontium manganite (LSM) cathode of solid oxide fuel cells (SOFCs) has been characterized using focused ion beam (FIB) and scanning electron microscopy(SEM) combined with image processing. Two-point correlation functions of the two-dimensional (2D) images taken along the direction of porosity gradient are used to reconstruct a three-dimensional (3D) microstructure. The effective elastic modulus of the two-phase porosity-graded cathode is predicted using strong contrast (SC) and composite inclusion (CI) homogenization techniques. The effectiveness of the two methods in predicting the effective elastic properties of the porositygraded LSM cathode is investigated in comparison with the results obtained from the finite element model (FEM).

Hamedani, Amani; Baniassadi, Majid; Sheidaei, A.; Pourboghrat, F.; Remond, Y.; Khaleel, Mohammad A.; Garmestani, Hamid

2014-02-28T23:59:59.000Z

480

Three-dimensional calculations of neutron streaming in the beam tubes of the ORNL HFIR (High Flux Isotope Reactor) Reactor  

SciTech Connect (OSTI)

The streaming of neutrons through the beam tubes in High Flux Isotope Reactor at Oak Ridge National Laboratory has resulted in a reduction of the fracture toughness of the reactor vessel. As a result, an evaluation of vessel integrity was undertaken in order to determine if the reactor can be operated again. As a part of this evaluation, three-dimensional neutron transport calculations were performed to obtain fluxes at points of interest in the wall of the vessel. By comparing the calculated and measured activation of dosimetry specimens from the vessel surveillance program, it was determined that the calculated flux shape was satisfactory to transpose the surveillance data to the locations in the vessel. A bias factor was applied to correct for the average C/E ratio of 0.69. 8 refs., 7 figs., 3 tabs.

Childs, R.L.; Rhoades, W.A.; Williams, L.R.

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "three-dimensional seismic surveying" 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

Binder-free Ge-three dimensional graphene electrodes for high-rate capacity Li-ion batteries  

Science Journals Connector (OSTI)

A binder-free high-rate Ge-three dimensional (3D) graphene composite was synthesized by directly depositing Ge film atop 3D graphene grown by microwave plasma chemical vapor deposition on Ni substrate. The Ge-3D graphene structure demonstrates excellent electrochemical performance as a lithium ion battery (LIB) anode with a reversible capacity of 1140 mAh g?1 at 1/3C over 100 cycles and 835 mAh g?1 at 8C after 60 cycles and significantly a discharge capacity of 186 mAh g?1 was still achieved at 32C. The high capacity and outstanding stability of the Ge-3D graphene composite propose it as a promising electrode in high-performance thin film LIBs.

C. D. Wang; Y. S. Chui; Y. Li; X. F. Chen; W. J. Zhang

2013-01-01T23:59:59.000Z

482

Inversion of infrared imaging bolometer based on one-dimensional and three-dimensional modeling in HL-2A  

SciTech Connect (OSTI)

Linear regularization has been applied to the HL-2A infrared imaging bolometer to reconstruct local plasma emission with one-dimensional (1D) and three-dimensional (3D) modeling under the assumption of toroidal symmetry. In the 3D modeling, a new method to calculate the detector point response function is introduced. This method can be adapted to an arbitrarily shaped pinhole. With the full 3D treatment of the detector geometry, up to 50% of the mean-squared error is reduced compared with the 1D modeling. This is attributed to the effects of finite detector size being taken into account in the 3D modeling. Meanwhile, the number of the bolometer pixels has been optimized to 20 × 20 by making a trade-off between the number of bolometer pixels and the sensitivity of the system. The plasma radiated power density distributions have been calculated as a demonstration using 1D modeling and 3D modeling, respectively.

Gao, J. M., E-mail: gaojm@swip.ac.cn; Liu, Y.; Li, W.; Cui, Z. Y.; Dong, Y. B.; Lu, J.; Xia, Z. W.; Yi, P.; Yang, Q. W. [Southwestern Institute of Physics, Chengdu 610041 (China)] [Southwestern Institute of Physics, Chengdu 610041 (China)

2014-04-15T23:59:59.000Z

483

Direct Observation and Image-Based Simulation of Three-Dimensional Tortuous Crack Evolution inside Opaque Materials  

Science Journals Connector (OSTI)

We present a combined novel methodology to study the three-dimensional complex geometry of a tortuous crack and identify the essential features of the crack and its propagation inside a heterogeneous material. We find that some severe damage events occur unexpectedly below a local mode-I crack within the sample; we realize that the severe plastic zone of the local mode-I crack is shifted down by another unseen crack segment hidden behind, which is responsible for the unusual damage phenomenon observed. We also find that the crack grows fast at some locations but slowly at some other locations along the crack front; we recognize that the crack-tip fields are reduced by neighboring hidden crack segments, which accounts for the retarded propagation of some part of the crack front. The feasibility and power of the proposed methodology highlights the potential of a new way to study fracture mechanisms in real materials.

Lihe Qian; Hiroyuki Toda; Kentaro Uesugi; Masakazu Kobayashi; Toshiro Kobayashi

2008-03-21T23:59:59.000Z

484

Analysis of the viscoelastic coefficients in the Vignale-Kohn functional: The cases of one- and three-dimensional polyacetylene  

Science Journals Connector (OSTI)

In this work we employ the Vignale-Kohn (VK) current functional in the calculation of the linear response properties of polyacetylene for both the one-dimensional infinite chain and the infinite three-dimensional crystal. We test the two existing parametrizations of the longitudinal and transverse exchange-correlation kernels of the homogeneous electron gas that enter the VK functional and show that they lead to very different results. We argue that this is mainly caused by the different values of these kernels in the zero-frequency limit in the two parametrizations. In this limit knowledge of the exchange correlation part of the shear modulus of the homogeneous electron gas becomes very important. It is exactly this quantity that is not known accurately. Furthermore, we show that our results are in good qualitative agreement with results obtained earlier using the Vignale-Kohn functional for polyacetylene oligomers.

J. A. Berger; P. L. de Boeij; R. van Leeuwen

2005-04-05T23:59:59.000Z

485

Three-dimensional mapping of equiprobable hydrostratigraphic units at the Frenchman Flat Corrective Action Unit, Nevada Test Site  

SciTech Connect (OSTI)

Geological and geophysical data are used with the sequential indicator simulation algorithm of Gomez-Hernandez and Srivastava to produce multiple, equiprobable, three-dimensional maps of informal hydrostratigraphic units at the Frenchman Flat Corrective Action Unit, Nevada Test Site. The upper 50 percent of the Tertiary volcanic lithostratigraphic column comprises the study volume. Semivariograms are modeled from indicator-transformed geophysical tool signals. Each equiprobable study volume is subdivided into discrete classes using the ISIM3D implementation of the sequential indicator simulation algorithm. Hydraulic conductivity is assigned within each class using the sequential Gaussian simulation method of Deutsch and Journel. The resulting maps show the contiguity of high and low hydraulic conductivity regions.

Shirley, C.; Pohlmann, K.; Andricevic, R.

1996-09-01T23:59:59.000Z

486

Three-dimensional turbulent particle dispersion submodel development. Final report, 15 April 1991--15 April 1993  

SciTech Connect (OSTI)

Many practical combustion processes which use solid particles, liquid droplets, or slurries as fuels introduce these fuels into turbulent environments. Examples include spray combustion, pulverized coal and coal slurry combustion, fluidized beds, sorbent injection, and hazardous waste incineration. The interactions of the condensed phases with turbulent environments in such applications have not been well described. Such a description is complicated by the difficulty of describing turbulence in general, even in the absence of particles or droplets. But the complications in describing the dispersion and reaction of the condensed phases in turbulent environments do not stem entirely, or even primarily, from the uncertainties in the description of the turbulence. Even when the turbulence characteristics are known, computational methods for coupling the dynamics of the particulate phase with the continuous phase have not been well established. Several new theoretical descriptions of the turbulent dispersion of particles and droplets have been proposed over the past few years. It has been the purpose of this project to explore the potential of these theories for coupling with the other aspects of three-dimensional, reacting, turbulent, particle-laden systems, to provide computational simulations that could be useful for addressing industrial problems. Two different approaches were explored in this project. The major thrust of this project was on identifying a suitable dispersion submodel for dilute dispersed flows, implementing it in a comprehensive three-dimensional CFD code framework for combustion simulation and evaluating its performance rigorously. In another effort the potential of a dispersion submodel for densely loaded systems was analyzed. This report discusses the main issues that were resolved as part of this project.

Smith, P.J.

1993-12-31T23:59:59.000Z

487

Method and apparatus for enhanced sensitivity filmless medical x-ray imaging, including three-dimensional imaging  

DOE Patents [OSTI]

A filmless X-ray imaging system includes at least one X-ray source, upper and lower collimators, and a solid-state detector array, and can provide three-dimensional imaging capability. The X-ray source plane is distance z{sub 1} above upper collimator plane, distance z{sub 2} above the lower collimator plane, and distance z{sub 3} above the plane of the detector array. The object to be X-rayed is located between the upper and lower collimator planes. The upper and lower collimators and the detector array are moved horizontally with scanning velocities v{sub 1}, v{sub 2}, v{sub 3} proportional to z{sub 1}, z{sub 2} and z{sub 3}, respectively. The pattern and size of openings in the collimators, and between detector positions is proportional such that similar triangles are always defined relative to the location of the X-ray source. X-rays that pass through openings in the upper collimator will always pass through corresponding and similar openings in the lower collimator, and thence to a corresponding detector in the underlying detector array. Substantially 100% of the X-rays irradiating the object (and neither absorbed nor scattered) pass through the lower collimator openings and are detected, which promotes enhanced sensitivity. A computer system coordinates repositioning of the collimators and detector array, and X-ray source locations. The computer system can store detector array output, and can associate a known X-ray source location with detector array output data, to provide three-dimensional imaging. Detector output may be viewed instantly, stored digitally, and/or transmitted electronically for image viewing at a remote site. 5 figs.

Parker, S.

1995-10-24T23:59:59.000Z

488

Seismic sources  

DOE Patents [OSTI]

Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Longitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements for more than about one minute. 9 figs.

Green, M.A.; Cook, N.G.W.; McEvilly, T.V.; Majer, E.L.; Witherspoon, P.A.

1987-04-20T23:59:59.000Z

489

3-D Seismic Methods for Shallow Imaging Beneath Pavement  

E-Print Network [OSTI]

The research presented in this dissertation focuses on survey design and acquisition of near-surface 3D seismic reflection and surface wave data on pavement. Increased efficiency for mapping simple subsurface interfaces ...

Miller, Brian

2013-05-31T23:59:59.000Z

490

Three-Dimensional Surface Geophysical Exploration of the 200-Series Tanks at the 241-C Tank Farm  

SciTech Connect (OSTI)

A surface geophysical exploration (SGE) survey using direct current electrical resistivity was conducted within the C Tank Farm in the vicinity of the 200-Series tanks at the Hanford Site near Richland, Washington. This survey was the second successful SGE survey to utilize the Geotection(TM)-180 Resistivity Monitoring System which facilitated a much larger survey size and faster data acquisition rate. The primary objective of the C Tank Farm SGE survey was to provide geophysical data and subsurface imaging results to support the Phase 2 RCRA Facility Investigation, as outlined in the Phase 2 RCRA Facility Investigation / Corrective Measures work plan RPP-PLAN-39114.

Crook, N. [HydroGEOPHYSICS, Inc., Tuscon, AZ (United States); McNeill, M. [HydroGEOPHYSICS, Inc., Tuscon, AZ (United States); Dunham, Ralph [Columbia Energy and Environmental Services, Inc. (United States); Glaser, Danney R. [Washington River Protection Solutions, LLC (United States)

2014-02-26T23:59:59.000Z

491

Three dimensional transducer  

DOE Patents [OSTI]

A testing instrument for mechanical testing at nano or micron scale includes a transducer body, and a coupling shaft coupled with a probe tip. A transducer body houses a capacitor. The capacitor includes first and second counter electrodes and a center electrode assembly interposed therebetween. The center electrode assembly is movable with the coupling shaft relative to the first and second counter electrodes, for instance in one or more of dimensions including laterally and normally. The center electrode assembly includes a center plate coupled with the coupling shaft and one or more springs extending from the center plate. Upper and lower plates are coupled with the center plate and cover the center plate and the one or more springs. A shaft support assembly includes one or more support elements coupled along the coupling shaft. The shaft support assembly provides lateral support to the coupling shaft.

Warren, Oden Lee; Asif, Syed Amanulla Syed; Oh, Yunje; Feng, Yuxin; Cyrankowski, Edward; Major, Ryan

2014-09-30T23:59:59.000Z

492

Seismic sources  

DOE Patents [OSTI]

Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Logitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole relative to a stator that is clamped to the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements at a power level that causes heating to over 150.degree. C. within one minute of operation, but energizing the elements for no more than about one minute.

Green, Michael A. (Oakland, CA); Cook, Neville G. W. (Lafayette, CA); McEvilly, Thomas V. (Berkeley, CA); Majer, Ernest L. (El Cirrito, CA); Witherspoon, Paul A. (Berkeley, CA)

1992-01-01T23:59:59.000Z

493

A three-dimensional zinc-based coordination polymer built from 5-carboxyl­ato-1-carboxyl­atomethyl-2-oxidopyridinium with a 4-connected sra topology  

Science Journals Connector (OSTI)

In a novel three-dimensional ZnII coordination polymer prepared by the hydro­thermal assembly of Zn(CH3COO)2?2H2O and 5-carb­oxy-1-(carb­oxy­methyl)pyridin-1-ium-2-olate (H2ccop), the ZnII atom adopts a five-coordinated distorted trigonal biyramidal geometry. The ccop2- ligands adopt the same 4-bridging mode linking four ZnII cations and giving rise to a three-dimensional framework with a 4-connected sra topology.

Ma, D.-Y.

2014-07-31T23:59:59.000Z

494

TURBULENT MIXING AND LAYER FORMATION IN DOUBLE-DIFFUSIVE CONVECTION: THREE-DIMENSIONAL NUMERICAL SIMULATIONS AND THEORY  

SciTech Connect (OSTI)

Double-diffusive convection, often referred to as semi-convection in astrophysics, occurs in thermally and compositionally stratified systems which are stable according to the Ledoux criterion but unstable according to the Schwarzschild criterion. This process has been given relatively little attention so far, and its properties remain poorly constrained. In this paper, we present and analyze a set of three-dimensional simulations of this phenomenon in a Cartesian domain under the Boussinesq approximation. We find that in some cases the double-diffusive convection saturates into a state of homogeneous turbulence, but with turbulent fluxes several orders of magnitude smaller than those expected from direct overturning convection. In other cases, the system rapidly and spontaneously develops closely packed thermo-compositional layers, which later successively merge until a single layer is left. We compare the output of our simulations with an existing theory of layer formation in the oceanographic context and find very good agreement between the model and our results. The thermal and compositional mixing rates increase significantly during layer formation and increase even further with each merger. We find that the heat flux through the staircase is a simple function of the layer height. We conclude by proposing a new approach to studying transport by double-diffusive convection in astrophysics.

Rosenblum, E. [Department of Physics, Stony Brook University, Stony Brook, New York, NY 11794 (United States); Garaud, P.; Traxler, A. [Department of Applied Mathematics and Statistics, Baskin School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States); Stellmach, S. [Institut fuer Geophysik, Westfaelische Wilhelms-Universitaet Muenster, Muenster D-48149 (Germany)

2011-04-10T23:59:59.000Z

495

ANALYSES OF THREE-DIMENSIONAL MAGNETOHYDRODYNAMIC INSTABILITY OF ANTISOLAR LATITUDINAL DIFFERENTIAL ROTATION IN F, G, AND K STARS  

SciTech Connect (OSTI)

Motivated by observations that only a very few stars have been found to have antisolar differential rotation, much weaker in amplitude than that of the Sun, we analyze the stability of antisolar and solar-type latitudinal differential rotations in the tachoclines of typical F, G, and K stars. We employ two three-dimensional thin-shell models, one for a Boussinesq but nonhydrostatic system and the other for a hydrostatic but non-Boussinesq system. We find that, in general, the combination of toroidal field band and differential rotation is more unstable, and unstable for lower toroidal fields, for antisolar than for solar-type differential rotation. In the antisolar case, the instability is always found to weaken the differential rotation, even if the primary energy source for the instability is the magnetic field. This favors surface antisolar differential rotations in stars being weaker than solar types, if the instability in the tachocline is felt at the surface of the star. This is most likely to happen in F stars, whose convection zones are much thinner than they are in G and K stars. This effect could help explain why the antisolar differential rotations that have been found are very weak compared with the rotation of the Sun.

Dikpati, Mausumi; Cally, Paul S., E-mail: dikpati@hao.ucar.edu, E-mail: paul.cally@monash.edu [High Altitude Observatory, National Center for Atmospheric Research 3080 Center Green, Boulder, CO 80301 (United States)

2011-09-20T23:59:59.000Z

496

Three dimensional dust-acoustic solitary waves in an electron depleted dusty plasma with two-superthermal ion-temperature  

SciTech Connect (OSTI)

A theoretical investigation is carried out to study the existence and characteristics of propagation of dust-acoustic (DA) waves in an electron-depleted dusty plasma with two-temperature ions, which are modeled by kappa distribution functions. A three-dimensional cylindrical Kadomtsev-Petviashvili equation governing evolution of small but finite amplitude DA waves is derived by means of a reductive perturbation method. The influence of physical parameters on solitary wave structure is examined. Furthermore, the energy integral equation is used to study the existence domains of the localized structures. It is found that the present model can be employed to describe the existence of positive as well as negative polarity DA solitary waves by selecting special values for parameters of the system, e.g., superthermal index of cold and/or hot ions, cold to hot ion density ratio, and hot to cold ion temperature ratio. This model may be useful to understand the excitation of nonlinear DA waves in astrophysical objects.

Borhanian, J. [Department of Physics, Faculty of Science, University of Mohaghegh Ardabili, P. O. Box 179, Ardabil (Iran, Islamic Republic of); Shahmansouri, M. [Department of Physics, Faculty of Science, Arak University, Arak, P.O. Box 38156-8-8349 (Iran, Islamic Republic of)

2013-01-15T23:59:59.000Z

497

Three-Dimensional Simulations of the Deflagration Phase of the Gravitationally Confined Detonation Model of Type Ia Supernovae  

E-Print Network [OSTI]

We report the results of a series of three-dimensional (3-D) simulations of the deflagration phase of the gravitationally confined detonation mechanism for Type Ia supernovae. In this mechanism, ignition occurs at one or several off-center points, resulting in a burning bubble of hot ash that rises rapidly, breaks through the surface of the star, and collides at a point opposite breakout on the stellar surface. We find that detonation conditions are robustly reached in our 3-D simulations for a range of initial conditions and resolutions. Detonation conditions are achieved as the result of an inwardly-directed jet that is produced by the compression of unburnt surface material when the surface flow collides with itself. A high-velocity outwardly-directed jet is also produced. The initial conditions explored in this paper lead to conditions at detonation that can be expected to produce large amounts of $^{56}$Ni and small amounts of intermediate mass elements. These particular simulations are therefore relevant only to high luminosity Type Ia supernovae. Recent observations of Type Ia supernovae imply a compositional structure that is qualitatively consistent with that expected from these simulations.

G C Jordan IV; R T Fisher; D M Townsley; A C Calder; C Graziani; S Asida; D Q Lamb; J W Truran

2007-03-21T23:59:59.000Z

498

Development of an optical three-dimensional laser tracker using dual modulated laser diodes and a signal detector  

SciTech Connect (OSTI)

Laser trackers are widely used in industry for tasks such as the assembly of airplanes and automobiles, contour measurement, and robot calibration. However, laser trackers are expensive, and the corresponding solution procedure is very complex. The influence of measurement uncertainties is also significant. This study proposes a three-dimensional space position measurement system which consists of two tracking modules, a zero tracking angle return subsystem, and a target quadrant photodiode (QPD). The target QPD is placed on the object being tracked. The origin locking method is used to keep the rays on the origin of the target QPD. The position of the target QPD is determined using triangulation since the two laser rays are projected onto one QPD. Modulation and demodulation are utilized to separate the coupled positional values. The experiment results show that measurement errors in the X, Y, and Z directions are less than {+-}0.05% when the measured object was moved by 300, 300, and 200 mm in the X, Y, and Z axes, respectively. The theoretical measurement error estimated from the measurement model is between {+-}0.02% and {+-}0.07% within the defined measurable range. The proposed system can be applied to the measurements of machine tools and robot arms.

Lee, Hau-Wei; Chen, Chieh-Li [Department of Aeronautics and Astronautics, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan (China); Liu, Chien-Hung [Institute of Electro-Optical and Materials Science, National Formosa University, Huwei, Yunlin 632, Taiwan (China)

2011-03-15T23:59:59.000Z

499

Quaternionic and Poisson-Lie structures in three-dimensional gravity: The cosmological constant as deformation parameter  

SciTech Connect (OSTI)

Each of the local isometry groups arising in three-dimensional (3d) gravity can be viewed as a group of unit (split) quaternions over a ring which depends on the cosmological constant. In this paper we explain and prove this statement and use it as a unifying framework for studying Poisson structures associated with the local isometry groups. We show that, in all cases except for the case of Euclidean signature with positive cosmological constant, the local isometry groups are equipped with the Poisson-Lie structure of a classical double. We calculate the dressing action of the factor groups on each other and find, among others, a simple and unified description of the symplectic leaves of SU(2) and SL(2,R). We also compute the Poisson structure on the dual Poisson-Lie groups of the local isometry groups and on their Heisenberg doubles; together, they determine the Poisson structure of the phase space of 3d gravity in the so-called combinatorial description.

Meusburger, C. [Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5 (Canada); Schroers, B. J. [Department of Mathematics and Maxwell Institute for Mathematical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)