Simulating the behavior of geologic materials under impact loading conditions requires the use of a constitutive model that includes the effects of bulking, yielding, damage, porous compaction and loading rate on the material response. This paper describes the development, implementation and calibration of a thermodynamically consistent constitutive model that incorporates these features. The paper also describes a computational study in which the model was used to perform numerical simulations of PILE DRIVER, a deeply-buried underground nuclear explosion detonated in granite at the Nevada Test Site. Particle velocity histories, peak velocity and peak displacement as a function of slant range obtained from the code simulations compare favorably with PILE DRIVER data. The simulated attenuation of peak velocity and peak displacement also agrees with the results from several other spherical wave experiments in granite.

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.

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Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

A four-cylinder 1.9 Volkswagen TDI Engine has been converted to run in Homogeneous Charge Compression Ignition (HCCI) mode. The stock configuration is a turbocharged direct injection Diesel engine. The combustion chamber has been modified by discarding the in-cylinder Diesel fuel injectors and replacing them with blank inserts (which contain pressure transducers). The stock pistons contain a reentrant bowl and have been retained for the tests reported here. The intake and exhaust manifolds have also been retained, but the turbocharger has been removed. A heater has been installed upstream of the intake manifold and fuel is added just downstream of this heater. The performance of this engine in naturally aspirated HCCI operation, subject to variable intake temperature and fuel flow rate, has been studied. The engine has been run with propane fuel at a constant speed of 1800 rpm. This work is intended to characterize the HCCI operation of the engine in this configuration that has been minimally modified from the base Diesel engine. The performance (BMEP, IMEP, efficiency, etc) and emissions (THC, CO, NOx) of the engine are presented, as are combustion process results based on heat release analysis of the pressure traces from each cylinder.

The U.S. Department of Energy (DOE), other federal agencies, state agencies, and the private sector pursuing environmental remediation programs are considering developing stewardship programs at contaminated sites that might not be remediated to the point of allowing unrestricted land use in the immediate future. Deciding to develop, implement, and monitor a stewardship program requires addressing the risks and costs inherent in such programs. A process that lays out the decision points and information and technology needs associated with these risks and costs would assist site managers, regulators, and members of the interested public in making decisions about full remediation versus stewardship programs and the management of such programs. Development of such a process is the subject of this report. The goals for development and use of this decisional process are twofold. The first goal is to help decision makers determine whether a stewardship program would be appropriate for a site and, if so, how to design it. The term ''decision makers'' is used in a very broad sense to include everyone with an interest in the site, even though they have varying degrees of authority and responsibility for decisions regarding the site. Site decision makers can include personnel responsible for …

This is the final report of a research program on low-temperature friction and wear, primarily focused on development of cryotribological theories and application to cryogenic devices, particularly superconducting magnets.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about the SAG Awards.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about the TWA.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

In Part I, this CRS report discusses the policy on “one China” since the United States began in 1971 to reach understandings with the People’s Republic of China (PRC) government in Beijing. Part II documents the evolution of the “one China” principle as articulated in key statements by Washington, Beijing, and Taipei. The U.S. policy on “one China” has evolved to cover three issues: sovereignty, peaceful resolution, and cross-strait dialogue.

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The release of the 2000 Census data for the apportionment of the House of Representatives among the States and the release of the state redistricting data to the States as required has renewed the decennial debate over several issues. This report contains information regarding the release and use of the State redistricting Census data, the Supreme Court case Utah v. Evans, and related material.

News release about plans for expanded use of liquefied natural gas buses by several transit agencies, including DART.

News release about DART's "Safety Camp," a transit safety program for children.

News release about DART's "Safety Camp," a transit safety program for children.

This purpose of this technical report is to provide a comprehensive summary of the waste package (WP) external criticality-related risk of the Plutonium Disposition ceramic waste form, which is being developed and evaluated by the Office of Fissile Materials Disposition of the United States Department of Energy (DOE). Potential accumulation of the fissile materials, {sup 239}Pu and {sup 235}U, in rock formations having a favorable chemical environment for such actions, requires analysis because autocatalytic configurations, while unlikely to form, never-the-less have consequences which are undesirable and require evaluation. Secondly, the WP design has evolved necessitating a re-evaluation of the internal WP degradation scenarios that contribute to the external source terms. The scope of this study includes a summary of the revised WP degradation calculations, a summary of the accumulation mechanisms in fractures and lithophysae in the tuff beneath the WP footprint, and a summary of the criticality risk calculations from any accumulated fissile material. Accumulations of fissile material external to the WP sufficient to pose a potential criticality risk require a deposition mechanism operating over sufficient time to reach required levels. The transporting solution concentrations themselves are well below critical levels (CRWMS 2001e). The ceramic waste form consists of Pu …

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.

PNNL developed a material balance assessment methodology based on conservation of mass for detecting leaks and mis-routings in pipeline transfer of double-shell tank waste at Hanford. The main factors causing uncertainty in these transfers are variable property and tank conditions of density, existence of crust, and surface disturbance due to mixer pump operation during the waste transfer. The methodology was applied to three waste transfers from Tanks AN-105 and AZ-102.

PNNL developed a material balance assessment methodology based on conservation of mass for detecting leaks and mis-routings in pipeline transfer of double-shell tank waste at Hanford. The main factors causing uncertainty in these transfers are variable property and tank conditions of density, existence of crust, and surface disturbance due to mixer pump operation during the waste transfer. The methodology was applied to three waste transfers from Tanks AN-105 and AZ-102.

This study investigates the inspection of a particular layer of a multi-layer structure using ultrasonic guided waves. Techniques based on Lamb waves have been developed for the inspection of plate structures and are well understood. Guided waves also exist in multi-layered plates as well. Energy distributions vary across the thickness of a multi-layer structure depending on the mode and frequency. Hence, a potential way to inspect the bottom layer of a structure is to find modes with sufficient energy in the bottom layer.

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.