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481 - 496 of
496
Spatial Parallelism of a 3D Finite Difference, Velocity-Stress Elastic Wave Propagation Code
Finite difference methods for solving the wave equation more accurately capture the physics of waves propagating through the earth than asymptotic solution methods. Unfortunately. finite difference simulations for 3D elastic wave propagation are expensive. We model waves in a 3D isotropic elastic earth. The wave equation solution consists of three velocity components and six stresses. The partial derivatives are discretized using 2nd-order in time and 4th-order in space staggered finite difference operators. Staggered schemes allow one to obtain additional accuracy (via centered finite differences) without requiring additional storage. The serial code is most unique in its ability to model a number of different types of seismic sources. The parallel implementation uses the MP1 library, thus allowing for portability between platforms. Spatial parallelism provides a highly efficient strategy for parallelizing finite difference simulations. In this implementation, one can decompose the global problem domain into one-, two-, and three-dimensional processor decompositions with 3D decompositions generally producing the best parallel speed up. Because i/o is handled largely outside of the time-step loop (the most expensive part of the simulation) we have opted for straight-forward broadcast and reduce operations to handle i/o. The majority of the communication in the code consists of passing subdomain …
Date:
December 9, 1999
Creator:
MINKOFF,SUSAN E.
Object Type:
Article
System:
The UNT Digital Library
Tank 241-AP-103 08/1999 Compatibility Grab Samples and Analytical Results for the Final Report
This document is the format IV, final report for the tank 241-AP-103 (AP-103) grab samples taken in August 1999 to address waste compatibility concerns. Chemical, radiochemical, and physical analyses on the tank AP-103 samples were performed as directed in ''Compatibility Grub Sampling and Analysis Plan for Fiscal Year 1999'' (Sasaki 1999a). Any deviations from the instructions provided in the tank sampling and analysis plan (TSAP) were discussed in this narrative. No notification limits were exceeded.
Date:
December 9, 1999
Creator:
BELL, K.E.
Object Type:
Report
System:
The UNT Digital Library
Tank 241-TX-113 Final Report for Rotary Mode Core Samples 253 and 258 [SEC 1 THRU SEC 6]
None
Date:
December 9, 1999
Creator:
BELL, K.E.
Object Type:
Report
System:
The UNT Digital Library
Tank Monitor and Control System (TMACS) Version Description Document
This document updates the Version Description Document with the changes incorporated in the Revision 11.1 software installation on the Tank Monitor and Control System (TMACS).
Date:
December 9, 1999
Creator:
WANDLING, R.R.
Object Type:
Report
System:
The UNT Digital Library
Test Plan for Rotary Mode Core Sample Truck Grapple Hoist Level Wind System
A Grapple Hoist Assembly is currently used on the Rotary Mode Core Sampling Trucks (RMCSTs) to actuate the sampler and retrieve the pintle rod during sampling operations. The hoist assembly includes a driven drum approximately two inches wide and six inches in diameter that rotates to pay out or reel in the 5/32-in. cable The current Grapple Hoist Assembly, detailed on drawing H-2-690057, is prone to ''bird nesting'' the cable on the drum. ''Bird nesting'' is a condition in which the cable does not wind onto the drum in a uniformly layered manner, but winds in a random fashion where the cable essentially ''piles up'' inappropriately on the drum and, on some occasions, winds on the drum drive shaft. A system to help control this ''bird nesting'' problem has been designed as an addition to the existing components of the Grapple Hoist Assembly. The new design consists of a mechanism that is timed with, and driven by, the shaft that drives the drum. This mechanism traverses back and forth across the width of the drum to lay the cable on the drum in a uniformly layered manner. This test plan establishes the acceptance criteria, test procedure and test conditions It …
Date:
December 9, 1999
Creator:
Boger, R. M.
Object Type:
Report
System:
The UNT Digital Library
Tevatron Top Quark Studies
The authors present a summary of recent measurements utilizing top quark candidate events extracted from approximately 110 pb{sup -1} of p{bar p} data collected by the CDF and D0 experiments at the Tevatron collider. They report on a new combined Tevatron top quark mass of 174.3 {+-} 5.1 GeV/c{sup 2} which takes into account five separate measurements made by the two experiments. They also demonstrate how the techniques developed for the mass analysis have been applied to further studies of the top quark and the t{bar t} system.
Date:
December 9, 1999
Creator:
James, E. B.
Object Type:
Article
System:
The UNT Digital Library
Texas Jewish Post (Fort Worth, Tex.), Vol. 53, No. 49, Ed. 1 Thursday, December 9, 1999
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 9, 1999
Creator:
Wisch, J. A. & Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
Text of Hawai'i ruling
Text of the Hawaiian Supreme Court ruling to uphold same-sex marriages only. Includes concurring opinion of Hawaiian Supreme Court judge.
Date:
December 9, 1999
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Thermal tests of 6 KA HTS current leads for the Tevatron
Prototype current leads incorporating High Temperature Superconductor (HTS) elements have been tested at Fermilab. Fermilab's Tevatron includes about 50 pair of 5 to 6 kA current leads, and Fermilab is investigating the feasibility of replacing some of these conventional leads with HTS leads. The prototype HTS current leads are cooled primarily by a countercurrent flow of liquid nitrogen from the 80 K intercept to the warm end of the leads, but also a small flow of helium gas cools the HTS section from the 4 K level. The HTS current leads carried the design current of 5 kA with good thermal and electrical stability. LN2 flow without current was 0.24 g/set per lead and with 5 kA was 0.53 g/set per lead, corresponding to heat inflows to the 80 K intercept of 46 Watts and 101 Watts, respectively. The heat input to the 4 K level was 0.6 W with no current and 0.7 W +/- 0.1 W per lead with 5 kA current, about 1/8 of the heat load via copper, vapor-cooled leads.
Date:
December 9, 1999
Creator:
G. Citver, S. Feher, T. J. Peterson and C. D. Sylvester
Object Type:
Article
System:
The UNT Digital Library
Throckmorton Tribune (Throckmorton, Tex.), Vol. 114, No. 11, Ed. 1 Thursday, December 9, 1999
Weekly newspaper from Throckmorton, Texas that includes local, state, and national news along with advertising.
Date:
December 9, 1999
Creator:
Mayes, Cecil
Object Type:
Newspaper
System:
The Portal to Texas History
Today Cedar Hill (Duncanville, Tex.), Vol. 34, No. 37, Ed. 1 Thursday, December 9, 1999
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
December 9, 1999
Creator:
Gooch, Robin
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 91, No. 49, Ed. 1 Thursday, December 9, 1999
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 9, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Using virtual reality to validate system models
To date most validation techniques are highly biased towards calculations involving symbolic representations of problems. These calculations are either formal (in the case of consistency and completeness checks), or informal in the case of code inspections. The authors believe that an essential type of evidence of the correctness of the formalization process must be provided by (i.e., must originate from) human-based calculation. They further believe that human calculation can by significantly amplified by shifting from symbolic representations to graphical representations. This paper describes their preliminary efforts in realizing such a representational shift.
Date:
December 9, 1999
Creator:
Winter, V. L. & Caudell, T. P.
Object Type:
Article
System:
The UNT Digital Library
Water dynamics in controlled pore silica glasses
Water in porous silica glass is a suitable system for investigating the effect of confinement on translational diffusion. These systems are important because of their relevance in catalytic and separation processes. Two factors are to be considered in the case of confined water: (1) the effects of hydrophilic and hydrophobic surfaces on interfacial water and (2) how the dynamics of the hydrogen bond network changes due to the volume of confinement. Here quasi-elastic neutron scattering experiments at room temperature on water filled controlled pore glasses with radius of 15, 24 and 32 {angstrom}, are presented and analyzed using the random-jump diffusion model. Both the average residence time and the mean jump distance increase with decreasing pore radius.
Date:
December 9, 1999
Creator:
Bordallo, H. N.; Herwig, K. W.; Dozier, W. D. & Drake, F.
Object Type:
Article
System:
The UNT Digital Library
The West News (West, Tex.), Vol. 109, No. 49, Ed. 1 Thursday, December 9, 1999
Weekly newspaper from West, Texas that includes local, state, and national news along with advertising.
Date:
December 9, 1999
Creator:
Knapek, Larry
Object Type:
Newspaper
System:
The Portal to Texas History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 97, No. 36, Ed. 1 Thursday, December 9, 1999
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 9, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History