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599 Matching Results
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Geomechanical Analysis with Rigorous Error Estimates for a Double-Porosity Reservoir Model
A model of random polycrystals of porous laminates is introduced to provide a means for studying geomechanical properties of double-porosity reservoirs. Calculations on the resulting earth reservoir model can proceed semi-analytically for studies of either the poroelastic or transport coefficients. Rigorous bounds of the Hashin-Shtrikman type provide estimates of overall bulk and shear moduli, and thereby also provide rigorous error estimates for geomechanical constants obtained from up-scaling based on a self-consistent effective medium method. The influence of hidden (or presumed unknown) microstructure on the final results can then be evaluated quantitatively. Detailed descriptions of the use of the model and some numerical examples showing typical results for the double-porosity poroelastic coefficients of a heterogeneous reservoir are presented.
Date:
April 11, 2005
Creator:
Berger, E. L.
Object Type:
Article
System:
The UNT Digital Library
Generalizing Lifted Tensor-Product Wavelets to Irregular Polygonal Domains
We present a new construction approach for symmetric lifted B-spline wavelets on irregular polygonal control meshes defining two-manifold topologies. Polygonal control meshes are recursively refined by stationary subdivision rules and converge to piecewise polynomial limit surfaces. At every subdivision level, our wavelet transforms provide an efficient way to add geometric details that are expanded from wavelet coefficients. Both wavelet decomposition and reconstruction operations are based on local lifting steps and have linear-time complexity.
Date:
April 11, 2002
Creator:
Bertram, M.; Duchaineau, M.A.; Hamann, B. & Joy, K.I.
Object Type:
Article
System:
The UNT Digital Library
Director of National Intelligence: Statutory Authorities
In passing the Intelligence Reform and Terrorism Prevention Act of 2004 (P.L. 108-458) in late 2004, Congress approved the most comprehensive reform of the U.S. Intelligence Community since its establishment over 50 years ago. Principal among enacted changes was the establishment of a new position of the Director of National Intelligence (DNI) to manage the Intelligence Community. Some observers have questioned whether the new statute provides the DNI the necessary authorities to effectively manage the Community.
Date:
April 11, 2005
Creator:
Best, Richard A., Jr.; Cumming, Alfred & Masse, Todd M.
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 26, No. 10, Ed. 1 Wednesday, April 11, 2007
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2007
Creator:
Bick, Jack & Crimmins, Blaine
Object Type:
Newspaper
System:
The Portal to Texas History
The Harper Herald (Harper, Tex.), Vol. 70, No. 15, Ed. 1 Tuesday, April 11, 2000
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Doctoral Recital: 2008-04-11 - Kristan Blaylock, flute and piccolo
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 11, 2008
Creator:
Blaylock, Kristan
Object Type:
Sound
System:
The UNT Digital Library
Justification for Shielded Receiver Tube Additional Lead Shielding
In order to reduce high radiation dose rates encountered when core sampling some radioactive waste tanks the addition of 240 lbs. of lead shielding is being considered to the shielded receiver tube on core sample trucks No.1, No.3 and No.4. The lead shielding is 4 inch diameter x 1/2 inch thick half rounds that have been installed around the SR tube over its' full length. Using three unreleased but independently reviewed structural analyses HNF-6018 justifies the addition of the lead shielding.
Date:
April 11, 2000
Creator:
Boger, R. M.
Object Type:
Report
System:
The UNT Digital Library
Improved PV system reliability results from surge evaluations at Sandia National Laboratories
Electrical surges on ac and dc inverter power wiring and diagnostic cables have the potential to shorten the lifetime of power electronics. These surges may be caused by either nearby lightning or capacitor switching transients. This paper contains a description of ongoing surge evaluations of PV power electronics and surge mitigation hardware at Sandia.
Date:
April 11, 2000
Creator:
Bonn, Russell H. & Gonzalez, Sigifredo
Object Type:
Article
System:
The UNT Digital Library
Developing a Process for Commercial Silica Production from Geothermal Brines
Useful mineral by-products can be produced from geothermal brines. Although silica has many commercial uses, problems remain in producing a marketable product. We are conducting laboratory and modeling studies aimed at optimizing for rubber additive use, the properties of silica precipitates from Salton Sea and Coso-like geothermal fluids, Our goal is to develop a robust technique for producing silicas that have desirable physical and chemical properties for commercial use, while developing a generic understanding of silica precipitation that will allow extraction to be extended to additional fluid types, and to be easily modified to produce new types of marketable silica. Our experiments start with an acidified geothermal fluid similar to those treated by pH modification technology. Silica precipitation is induced by adding base and/or adding Mg or Ca salts to affect the nature of the precipitate. For the analog Salton Sea fluids, adding base alone caused silica to precipitate fairly rapidly. To date, we have characterized precipitates from experiments in which the final pH varied from 4 to 8, where NaOH and Na{sub 2}C0{sub 3} were added as bases, and CaCl{sub 2} and MgCl{sub 2} were added as salts. SEM photos of the silica precipitates from the Salton Sea and …
Date:
April 11, 2001
Creator:
Bourcier, W; Martin, S; Viani, B & Bruton, C
Object Type:
Article
System:
The UNT Digital Library
Waste Feed Delivery Purex Process Connector Design Pressure
The pressure retaining capability of the PUREX process connector is documented. A context is provided for the connector's current use within existing Projects. Previous testing and structural analyses campaigns are outlined. The deficient condition of the current inventory of connectors and assembly wrenches is highlighted. A brief history of the connector is provided. A bibliography of pertinent references is included.
Date:
April 11, 2000
Creator:
Brackenbury, P. J.
Object Type:
Report
System:
The UNT Digital Library
Dark Matter and Baryons in the Most X-ray Luminous and Merging Galaxy Cluster RX
None
Date:
April 11, 2008
Creator:
Bradac, Marusa; Schrabback, Tim; Erben, Thomas; McCourt, Michael; Million, Evan; Mantz, Adam et al.
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 107, No. 38, Ed. 1 Thursday, April 11, 2002
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 11, 2002
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 112, No. 39, Ed. 1 Wednesday, April 11, 2007
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 11, 2007
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
Ultra-High Strength in Nanocrystalline Materials Under Shock Loading
Molecular dynamics simulations of nanocrystalline (nc) copper under shock loading show an unexpected ultra-high strength behind the shock front. The strength at high pressure can be up to twice the value at low pressure, for all grain sizes studied here (5-50 nm grains, with up to {approx}4 10{sup 8} atoms). Partial and perfect dislocations, twinning, and debris from dislocation interactions are found behind the shock front. Results are interpreted in terms of the pressure dependence of both deformation mechanisms active at these grain sizes, namely dislocation plasticity and grain boundary sliding. These simulations, together with new shock experiments on nc nickel, raise the possibility of achieving ultra-hard materials during and after shock loading.
Date:
April 11, 2005
Creator:
Bringa, E. M.; Caro, A.; Wang, Y. M.; Victoria, M.; McNaney, J.; Remington, B. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 88, No. 156, Ed. 1 Friday, April 11, 2003
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2003
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 176, Ed. 1 Sunday, April 11, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 181, Ed. 1 Monday, April 11, 2005
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2005
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Light-Front Dynamics and AdS/QCD Correspondence: Gravitational FormFactors of Composite Hadrons
None
Date:
April 11, 2008
Creator:
Brodsky, Stanley J. & de Teramond, Guy F.
Object Type:
Article
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 108, No. 72, Ed. 1 Wednesday, April 11, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 109, No. 73, Ed. 1 Thursday, April 11, 2002
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2002
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 72, Ed. 1 Tuesday, April 11, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 110, No. 65, Ed. 1 Friday, April 11, 2003
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2003
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 71, Ed. 1 Tuesday, April 11, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 115, No. 71, Ed. 1 Wednesday, April 11, 2007
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2007
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History