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419 Matching Results
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Hong Kong’s Ongoing Transition: Implications of Chinese Sovereignty in 2001. March 2001
This report focuses on the situation in Hong Kong as it continues its political and social transformation after the July 1997 reversion to Chinese sovereignty.
Date:
March 23, 2001
Creator:
Dumbaugh, Kerry
Object Type:
Report
System:
The UNT Digital Library
Gas Pressure Forming of Titanium Alloys and Composites by Transformation Superplasticity
By thermally cycling through their transformation temperature range, coarse-grained, polymorphic materials can be deformed superplastically, owing to the emergence of transformation mismatch plasticity (or transformation superplasticity) as a deformation mechanism. This mechanism is investigated under biaxial stress conditions during thermal cycling of unalloyed titanium, Ti-6Al-4V, and their composites (Ti/10 vol.% TiC{sub p}, Ti-6Al-4V/10 vol% TiC{sub p} and Ti-6Al-4V/5 vol.% TiB{sub w}). During gas-pressure dome bulging experiments, the dome height was measured as a function of forming time. Adapting existing models of biaxial doming to the case of transformation superplasticity where the strain-rate sensitivity is unity, we verify the operation of this deformation mechanism in all experimental materials, and compare the biaxial results to uniaxial thermal cycling results on the same materials. Finally, existing thickness distribution models are compared with experimentally measured profiles.
Date:
October 23, 2001
Creator:
Frary, M; Schuh, C & Dunand, D C
Object Type:
Article
System:
The UNT Digital Library
Diagnostic Systems Approach to Watershed Management
The water quality of discharge from the surface water system is ultimately dictated by land use and climate within the watershed. Water quality has vastly improved from point source reduction measures, yet, non-point source pollutants continue to rise. 30 to 40% of rivers still do not meet water quality standards for reasons that include impact from urban storm water runoff, agricultural and livestock runoff, and loss of wetlands. Regulating non-point source pollutants proves to be difficult since specific dischargers are difficult to identify. However, parameters such as dissolved organic carbon (DOC) limit the amounts of chlorination due to simultaneous disinfection by-product formation. The concept of watershed management has gained much ground over the years as a means to resolve non-point source problems. Under this management scheme stakeholders in a watershed collectively agree to the nature and extent of non-point sources, determine water quality causes using sound scientific approaches, and together develop and implement a corrective plan. However, the ''science'' of watershed management currently has several shortcomings according to a recent National Research Council report. The scientific component of watershed management depends on acquiring knowledge that links water quality sources with geographic regions. However, there is an observational gap in this …
Date:
February 23, 2001
Creator:
Davisson, M L
Object Type:
Report
System:
The UNT Digital Library
Synthesis of Amino- and Nitro-Substituted Heterocycles as Insensitive Energetic Materials
In this paper we will describe the synthesis of several amino- and nitro-substituted heterocycles, examples from a continuing research project targeted at the synthesis of new, insensitive energetic materials that possess at least 80% the power of HMX (28% more power than TATB). Recently we reported the synthesis and scale-up of the insensitive energetic material, 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105). The energy content (81% the power of HMX) and thermal stability of LLM-105 make it a viable candidate material for insensitive boosters and deep oil perforation. We will report on recent synthetic improvements and several performance and safety tests performed on LLM-105, including a 1 in. cylinder shot and plate dent. We will also report on the synthesis and characterization of 4-amino-3,5-dinitropyrazole (LLM-116), an interesting new insensitive energetic material with a measured crystal density of 1.90 g/cc, to our knowledge the highest density yet measured for a five-membered heterocycle containing amino- and nitro-substituents. LLM-116 was synthesized by reacting 3,5-dinitropyrazole with 1,1,1-trimethylhydrazinium iodide (TMHI) in DMSO in the presence of base. The synthesis and characterization of 4-amino-5-nitro-1,2,3-triazole (ANTZ) and 43-dinitro-1,2,3-triazole (DNTZ), first described by Baryshnikov and coworkers, will also be presented along with the synthesis of several new energetic materials derived from ANTZ and …
Date:
August 23, 2001
Creator:
Pagoria, P. F.; Lee, G. S.; Mitchell, A. R. & Schmidt, R. D.
Object Type:
Article
System:
The UNT Digital Library
SEA - A Simplified Employee Assessment
This paper presents a proposal for modifying the current employee annual evaluation process in SCAD. It purports to simplify that process, primarily by breaking up the resultant document into a set of more or less independent components. It claims to reduce the overall time and effort required from each actor.
Date:
April 23, 2001
Creator:
Busby, L
Object Type:
Report
System:
The UNT Digital Library
National Atmospheric Release Advisory Center Internet Client (NARAC I Client) On-Line Help System Documentation
None
Date:
July 23, 2001
Creator:
Belles, R.; Fischer, K.; Foster, K.; Foster, C.; Gash, J. & Stewart, J.
Object Type:
Text
System:
The UNT Digital Library
Vietnam’s Labor Rights Regime: An Assessment
None
Date:
March 23, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
RCRA Assessment Plan for Single-Shell Tank Waste Management Area T at the Hanford Site
A groundwater quality assessment plan was prepared to investigate the rate and extent of aquifer contamination beneath Waste Management Area T at the Hanford Site in Washington State. This plan is an update of a draft plan issued in January 1999, which guided work performed in fiscal year 2000.
Date:
February 23, 2001
Creator:
Hodges, Floyd N. & Chou, Charissa J.
Object Type:
Report
System:
The UNT Digital Library
Molten Salt Oxidation: A Thermal Technology for Waste Treatment and Demilitarization
MSO is a good alternative to incineration for the treatment of a variety of organic wastes including obsolete explosives, low-level mixed waste streams, PCB contaminated oils, spent resins and carbon. The Lawrence Livermore National Laboratory (LLNL) has demonstrated the MSO process for the effective destruction of explosives, explosives-contaminated materials, and other wastes on a 1.5 kg/hr bench-scale unit and in an integrated MSO facility capable of treating 8 kg/hr of low-level radioactive mixed wastes. LLNL, under the direction and support of the Joint Demilitarization Technology (JDT) program, is currently building an integrated MSO plant for destroying explosives, explosives-contaminated sludge and explosives-contaminated activated charcoal. In a parallel effort, LLNL also provides technical support to DOE for the implementation of the MSO technology at industrial scale at Richland, Washington. Over 30 waste streams have been demonstrated with LLNL-built MSO systems. In this paper we will present our latest experimental data, our operational experience with MSO and also discuss its process capabilities.
Date:
August 23, 2001
Creator:
Hsu, P C; Watkins, B; Pruneda, C & Kwak, S
Object Type:
Article
System:
The UNT Digital Library
Thermal Decomposition of Trinitrotoluene (TNT) with a New One-Dimensional Time to Explosion (ODTX) Apparatus
The thermal explosion of trinitrotoluene (TNT) is used as a basis for evaluating the performance of a new One-Dimensional-Time-to-Explosion (ODTX) apparatus. The ODTX experiment involves holding a 12.7 mm-diameter spherical explosive sample under confinement (150 MPa) at a constant elevated temperature until the confining pressure is exceeded by the evolution of gases during chemical decomposition. The resulting time to explosion as a function of temperature provides valuable decomposition kinetic information. A comparative analysis of the measurements obtained from the new unit and an older system is presented. Discussion on selected performance aspects of the new unit will also be presented. The thermal explosion of TNT is highly dependent on the material. Analysis of the time to explosion is complicated by historical and experimental factors such as material variability, sample preparation, temperature measurement and system errors. Many of these factors will be addressed. Finally, a kinetic model using a coupled thermal and heat transport code (chemical TOPAZ) was used to match the experimental data.
Date:
March 23, 2001
Creator:
Tran, T. D.; Simpson, R. L.; Maienschein, J. & Tarver, Craig M.
Object Type:
Article
System:
The UNT Digital Library
[Letter from Daniel C. Graney to Michael Milliken]
Letter from Daniel C. Graney to Michael Milliken on July 23, 2001, discussing membership renewals with an enclosed check of $35.00. Included is an enclosed list of members with contact information.
Date:
July 23, 2001
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 126, No. 13, Ed. 1 Thursday, August 23, 2001
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 23, 2001
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site
A groundwater quality assessment plan was prepared to investigate the rate and extent of aquifer contamination beneath Waste Management Area TX-TY on the Hanford Site in Washington State. This plan is an update of a draft plan issued in February 1999, which guided work performed in fiscal year 2000.
Date:
February 23, 2001
Creator:
Hodges, Floyd N. & Chou, Charissa J.
Object Type:
Report
System:
The UNT Digital Library
Subsurface Contaminant Focus Area: Monitored Natural Attenuation (MNA)--Programmatic, Technical, and Regulatory Issues
Natural attenuation processes are commonly used for remediation of contaminated sites. A variety of natural processes occur without human intervention at all sites to varying rates and degrees of effectiveness to attenuate (decrease) the mass, toxicity, mobility, volume, or concentration of organic and inorganic contaminants in soil, groundwater, and surface water systems. The objective of this review is to identify potential technical investments to be incorporated in the Subsurface Contaminant Focus Area Strategic Plan for monitored natural attenuation. When implemented, the technical investments will help evaluate and implement monitored natural attenuation as a remediation option at DOE sites. The outcome of this review is a set of conclusions and general recommendations regarding research needs, programmatic guidance, and stakeholder issues pertaining to monitored natural attenuation for the DOE complex.
Date:
July 23, 2001
Creator:
Krupka, Kenneth M. & Martin, Wayne J.
Object Type:
Report
System:
The UNT Digital Library
Zone of Interaction Between Hanford Site Groundwater and Adjacent Columbia River
This report describes the FY 2000 results of a Science and Technology investigation of the groundwater/river interface at the Hanford Site. The investigation focused on (1) a 2-D simulation of water flowpaths beneath the shoreline region under the influence of a transient river stage, and (2) mixing between groundwater and river water.
Date:
October 23, 2001
Creator:
Peterson, Robert E. & Connelly, Michael P.
Object Type:
Report
System:
The UNT Digital Library
RCRA Groundwater Quality Assessment Report for Waste Management Area S-SX (November 1997 through April 2000)
This report updates a continuing groundwater quality assessment for single-shell tank Waste Management Area S-SX at the Hanford Site. This report covers November 1997 through April 2000. Major new findings include the following: groundwater contamination continues to persist in both the northern half of the Waste Management Area as well as the southern half; evaluation of changes in water table elevations indicates a gradual shift in the direction of groundwater flow from the southeast to a more easterly direction; discrete depth sampling suggests mobile tank waste contaminants are at the very top of the aquifer in downgradient wells along the southeast side of the SX tank farm.
Date:
February 23, 2001
Creator:
Johnson, Vernon G. & Chou, Charissa J.
Object Type:
Report
System:
The UNT Digital Library
[Mavis Martin singing at the Kennedy Center, 2001]
Photograph of opera singer Mavis Martin performing at Symphony with the Divas at the Kennedy Center for the Performing Arts in Washington, D.C. on September 23, 2001.
Date:
September 23, 2001
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Mavis Martin singing at the Kennedy Center, 2001]
Photograph of opera singer Mavis Martin performing at Symphony with the Divas at the Kennedy Center for the Performing Arts in Washington, D.C. on September 23, 2001.
Date:
September 23, 2001
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Mavis Martin singing at the Kennedy Center, 2001]
Photograph of opera singer Mavis Martin performing at Symphony with the Divas at the Kennedy Center for the Performing Arts in Washington, D.C. on September 23, 2001.
Date:
September 23, 2001
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Mavis Martin singing at the Kennedy Center, 2001]
Photograph of opera singer Mavis Martin performing at Symphony with the Divas at the Kennedy Center for the Performing Arts in Washington, D.C. on September 23, 2001.
Date:
September 23, 2001
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
The Ranger (San Antonio, Tex.), Vol. 76, No. 16, Ed. 1 Friday, February 23, 2001
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
February 23, 2001
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 206, No. 11, Ed. 1 Friday, March 23, 2001
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
March 23, 2001
Creator:
Keys, Scott & Alsobrook, Bruce
Object Type:
Newspaper
System:
The Portal to Texas History
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 106, No. 46, Ed. 1 Friday, November 23, 2001
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2001
Creator:
Keys, Scott & Alsobrook, Bruce
Object Type:
Newspaper
System:
The Portal to Texas History
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 206, No. 7, Ed. 1 Friday, February 23, 2001
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2001
Creator:
Keys, Scott & Lamb, Bill
Object Type:
Newspaper
System:
The Portal to Texas History