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442 Matching Results
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Integrated experimental and computational methods for structure determination and characterization of a new, highly stable cesium silicotitanate phase, Cs{sub 2}TiSi{sub 6}O{sub 15} (SNL-A)
Exploratory hydrothermal synthesis in the system Cs{sub 2}O-SiO{sub 2}-TiO{sub 2}-H{sub 2}O has produced a new polymorph of Cs{sub 2}TiSi{sub 6}O{sub 15} (SNL-A) whose structure was determined using a combination of experimental and theoretical techniques ({sup 29}Si and {sup 133}Cs NMR, X-ray Rietveld refinement, and Density Functional Theory). SNL-A crystallizes in the monoclinic space-group Cc with unit cell parameters: a = 12.998(2) {angstrom}, b = 7.5014(3) {angstrom}, c = 15.156(3) {angstrom}, {eta} = 105.80(3) {degree}. The SNL-A framework consists of silicon tetrahedra and titanium octahedra which are linked in 3-, 5-, 6-, 7- and 8-membered rings in three dimensions. SNL-A is distinctive from a previously reported C2/c polymorph of Cs{sub 2}TiSi{sub 6}O{sub 15} by different ring geometries. Similarities and differences between the two structures are discussed. Other characterizations of SNL-A include TGA-DTA, Cs/Si/Ti elemental analyses, and SEM/EDS. Furthermore, the chemical and radiation durability of SNL-A was studied in interest of ceramic waste form applications. These studies show that SNL-A is durable in both radioactive and rigorous chemical environments. Finally, calculated cohesive energies of the two Cs{sub 2}TiSi{sub 6}O{sub 15} polymorphs suggest that the SNL-A phase (synthesized at 200 C) is energetically more favorable than the C2/c polymorph (synthesized at 1,050 C).
Date:
April 24, 2000
Creator:
Nyman, May D.; Bonhomme, Francois R.; Teter, David M.; Maxwell, R. S.; Gu, B. X.; Wang, L. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Mechanical properties and shear failure surfaces of two alumina powders in triaxial compression
In the manufacture of ceramic components, near-net-shape parts are commonly formed by uniaxially pressing granulated powders in rigid dies. Density gradients that are introduced into a powder compact during press-forming often increase the cost of manufacturing, and can degrade the performance and reliability of the finished part. Finite element method (FEM) modeling can be used to predict powder compaction response, and can provide insight into the causes of density gradients in green powder compacts; however, accurate numerical simulations require accurate material properties and realistic constitutive laws. To support an effort to implement an advanced cap plasticity model within the finite element framework to realistically simulate powder compaction, the authors have undertaken a project to directly measure as many of the requisite powder properties for modeling as possible. A soil mechanics approach has been refined and used to measure the pressure dependent properties of ceramic powders up to 68.9 MPa (10,000 psi). Due to the large strains associated with compacting low bulk density ceramic powders, a two-stage process was developed to accurately determine the pressure-density relationship of a ceramic powder in hydrostatic compression, and the properties of that same powder compact under deviatoric loading at the same specific pressures. Using this …
Date:
April 24, 2000
Creator:
Zeuch, David H.; Grazier, J. Mark; Arguello, Jose G., Jr. & Ewsuk, Kevin G.
Object Type:
Article
System:
The UNT Digital Library
Memo of Readiness to Proceed with Phase 1 Privatization for the Tank Farm Contractor
This Readiness to Proceed Memorandum provides the CH2M HILL Hanford Group, Inc. formal certification of readiness to proceed with provision of the waste feed and infrastructure to handle the products from the privatization contractor's waste processing plant. Summary information is included from the integrated scope-cost-schedule baseline, the analyses of the baseline, management systems, and systems reviews.
Date:
April 24, 2000
Creator:
HONEYMAN, J.O.
Object Type:
Report
System:
The UNT Digital Library
Mexico-U.S. Relations: Issues for the 106th Congress
SUMMARY The United States and Mexico have a special relationship under the North American Free Trade Agreement (NAFTA), which removes trade and investment barriers between the countries. The relationship has been strengthened by presidential visits, including President Clinton's February 1999 trip to Mexico and President Zedillo's upcoming May 23 trip to Washington, and by regular contacts between cabinet-level officials. Major issues of concern to Congress are trade, immigration, drug trafficking, and political rights.
Date:
April 24, 2000
Creator:
Storrs, K. Larry
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 149, Ed. 1 Monday, April 24, 2000
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 24, 2000
Creator:
Wilmoth, Adam
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Eleanor Brown, April 24, 2000
The National Museum of the Pacific War presents an interview with Eleanor Brown. From early 1942 through 1944, Brown served as a general mechanics helper at Kelly Field in San Antonio, Texas, and had completed flight training. In April, she joined the Women’s Air Service Pilots (WASPs) in Sweetwater, Texas. Brown graduated, though WASP was disbanded in December of that same year. She returned to Kelly Field and continued to work as the first woman mechanic at the Air Force Base.
Date:
April 24, 2000
Creator:
Brown, Eleanor
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Eleanor Brown, April 24, 2000
The National Museum of the Pacific War presents an interview with Eleanor Brown. From early 1942 through 1944, Brown served as a general mechanics helper at Kelly Field in San Antonio, Texas, and had completed flight training. In April, she joined the Women’s Air Service Pilots (WASPs) in Sweetwater, Texas. Brown graduated, though WASP was disbanded in December of that same year. She returned to Kelly Field and continued to work as the first woman mechanic at the Air Force Base.
Date:
April 24, 2000
Creator:
Brown, Eleanor
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Ethel Blaine, April 24, 2000
The National Museum of the Pacific War presents an oral interview with Ethel ""Sally"" Blaine Millett. Millett grew up in Missouri and went to nurses training in San Diego, California. She volunteered for the Philippines in 1941. She witnessed the bombing at Clark Field. She took care of the soldiers wounded by Japanese strafing. When the bombing got too bad, the nurses left Statsenberg for Manila. Because of continued Japanese bombing all over the Philippines, the nurses had to keep moving as the hospitals moved. She describes having malaria and then having to evacuate from Bataan to Corregidor. Then they went to Mindanao where they were formally captured by the Japanese. They were moved to Davao and then to Santo Tomas. She describes losing her possessions. She describes life in the internment camp: the food, the work required, the sanitary conditions, the self-government, the birthrate, and the entertainment. Millett has to have an operation while at Santo Tomas. She also describes executions. Finally, the American soldiers arrived, and she took a plane home in February 1945. Her brother met her in San Francisco.
Date:
April 24, 2000
Creator:
Millett, Ethel Blaine
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Ethel Blaine, April 24, 2000
The National Museum of the Pacific War presents an oral interview with Ethel ""Sally"" Blaine Millett. Millett grew up in Missouri and went to nurses training in San Diego, California. She volunteered for the Philippines in 1941. She witnessed the bombing at Clark Field. She took care of the soldiers wounded by Japanese strafing. When the bombing got too bad, the nurses left Statsenberg for Manila. Because of continued Japanese bombing all over the Philippines, the nurses had to keep moving as the hospitals moved. She describes having malaria and then having to evacuate from Bataan to Corregidor. Then they went to Mindanao where they were formally captured by the Japanese. They were moved to Davao and then to Santo Tomas. She describes losing her possessions. She describes life in the internment camp: the food, the work required, the sanitary conditions, the self-government, the birthrate, and the entertainment. Millett has to have an operation while at Santo Tomas. She also describes executions. Finally, the American soldiers arrived, and she took a plane home in February 1945. Her brother met her in San Francisco.
Date:
April 24, 2000
Creator:
Millett, Ethel Blaine
Object Type:
Text
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 81, Ed. 1 Monday, April 24, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 24, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Plutonium Finishing Plant (PFP) Safety Class and Safety Significant Commercial Grade Items (CGI) Critical Characteristic
This document specifies the critical characteristics for Commercial Grade Items (CGI) procured for use in the Plutonium Finishing Plant as required by HNF-PRO-268 and HNF-PRO-1819. These are the minimum specifications that the equipment must meet in order to properly perform its safety function. There may be several manufacturers or models that meet the critical characteristics of any one item.
Date:
April 24, 2000
Creator:
Thomas, R. J.
Object Type:
Report
System:
The UNT Digital Library
Proposed foreword to the ATM Security Specification Version 1.1
A number of substantive modifications were made from Version 1.0 to Version 1.1 of the ATM Security Specification. To assist implementers in identifying these modifications, the authors propose to include a foreword to the Security 1.1 specification that lists these modifications. Typically, a revised specification provides some mechanism for implementers to determine the modifications that were made from previous versions. Since the Security 1.1 specification does not include change bars or other mechanisms that specifically direct the reader to these modifications, they proposed to include a modification table in a foreword to the document. This modification table should also be updated to include substantive modifications that are made at the San Francisco meeting.
Date:
April 24, 2000
Creator:
WITZKE,EDWARD L. & TARMAN,THOMAS D.
Object Type:
Article
System:
The UNT Digital Library
Radiation Enhanced Porosity and Roughness of Biomaterials
None
Date:
April 24, 2000
Creator:
Evelyn, A. L.; Rodrigues, M. G.; Ila, D.; Zimmerman, R. L.; Poker, D. B. & Hensley, D. K.
Object Type:
Article
System:
The UNT Digital Library
Radiation Enhanced Porosity and Roughness of Materials
None
Date:
April 24, 2000
Creator:
Evelyn, A.L.; Rodrigues, M. G.; Ila, D.; Zimmerman, R. L.; Poker, D. B. & Hensley, D. K.
Object Type:
Article
System:
The UNT Digital Library
Real-space and energy representations for the interface roughness scattering in quantum-well structures
The authors show that the real space representation of the interface-roughness as a fluctuating potential in the coordinate space is equivalent to the usual energy-fluctuation representation for intrasublevel scattering in a single quantum well with a generally shaped confinement-potential profile. The coordinate picture is, however, more general and can be used for higher-order effects and multi-sublevel scattering in coupled multi-quantum-well structures.
Date:
April 24, 2000
Creator:
LYO,SUNGKWUN K.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 191, Ed. 1 Monday, April 24, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 24, 2000
Creator:
Quinnelly, Lorrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Specific PVMaT R&D on Siemens Cz silicon product manufacturing: Annual Subcontract Report, June 1998 -- June 1999
This report describes work done by Siemens Solar Industries (SSI) from June 1998 to June 1999 during Phase 1 of a three-phase Photovoltaic Manufacturing Technology (PVMaT 5A2) subcontract from DOE/NREL. The work focuses on improvements in the cost per watt of Cz modules and improved PV module manufacturing technology. The first step toward reducing cost was to reduce wafer thickness. The approach has been a two-step reduction in thickness, from 385 microns to 250 micron cells, and then from 250 microns to 125 micron cells during Phase II. During Phase I, the handling tools, the back-surface-field process, and the confirmation of the environmental integrity of thinner wafers have all been accomplished. Cells with efficiency over 15.5% have been demonstrated in high-volume production. SSI has initiated the development and growth of 200-mm ingot to be fabricated into wafers and eventually cells. Cell and module production with 200-mm cells will begin during Phase II. Hazardous waste reduction has been attacked in two ways. The largest consumable item aside from polysilicon is silicon carbide (SiC) used in the wafer-slicing process. This SiC use has been reduced significantly through recycling and re-use. This program approach is well under way at SSI, with more than …
Date:
April 24, 2000
Creator:
Jester, T. L.
Object Type:
Report
System:
The UNT Digital Library
STAR: The Secure Tranportable Autonomous Reactor system, Encapsulated Fission Heat Source. Progress report for period terminating March 31, 2000
Significant progress has been made since the beginning of this project, in September 1999. Part of the project findings are described in References 1 and 2. So far we have found no ''show-stopper''. In fact, based on the findings accumulated so far it appears to us that the Encapsulated Nuclear Heat Source (ENHS) is technologically feasible and looks even more attractive than initially conceived.
Date:
April 24, 2000
Creator:
Greenspan, Ehud
Object Type:
Report
System:
The UNT Digital Library
Supercritical carbon dioxide-soluble ligands for extracting actinide metal ions from porous solids (EMSP Project Number 64965)
The objective of this project is to develop novel, substituted diphosphonic acid ligands that can be used for supercritical carbon dioxide extraction (SCDE) of actinide ions from solid wastes. Specifically, selected diphosphonic acids, which are known to form extremely stable complexes with actinides in aqueous and organic solution, are to be rendered carbon dioxide-soluble by the introduction of appropriate alkyl- or silicon-containing substituents. The metal complexation chemistry of these new ligands in SC-CO{sub 2} will then be investigated and techniques for their use in actinide extraction from porous solids developed. This report summarizes the work performed during the first 1.3 years of a 3-year program. Because the planned studies of metal complexation and the development of techniques for actinide removal from solids are dependent on the availability of suitable ligands, efforts to date have focused primarily on the synthesis of selected alkyl- or silicon-containing diphosphonic acids. The authors' principal targets have been derivatives in which the silicon-containing groups either serve as the ester function or are attached to the anchor carbon of the diphosphonic acid. Because methylenediphosphonic acid (MDPA) is commercially available and because its esterification with simple alcohols to yield symmetrical diesters is well-established, their initial studies have focused …
Date:
April 24, 2000
Creator:
Dietz, M. L.; Barrans, Jr., R. E.; Herlinger, A. W. & Brennecke, J. F.
Object Type:
Report
System:
The UNT Digital Library
Tank Farm Contractor Phase 1 Feed Delivery and Storage and Disposal Mission Summary for 2006 Hot Start Extended Order
This is the level one logic diagram for the River Protection Project (RPP), Tank Farm Contractor, Phase 1, Feed Delivery Storage and Disposal Mission Summary for 2006 Hot Start.
Date:
April 24, 2000
Creator:
Davis, T. J.
Object Type:
Report
System:
The UNT Digital Library
Tank Farm Contractor Phase 1 Feed Delivery Storage and Disposal Mission Summary for 2006 Hot Start
This is the level one logic diagram for the River Protection Project (RPP), Tank Farm Contractor, Phase 1, Feed Delivery Storage and Disposal Mission Summary for 2006 Hot Start.
Date:
April 24, 2000
Creator:
Davis, T. J.
Object Type:
Report
System:
The UNT Digital Library
Texas Disease Prevention News, Volume 60, Number 9, April 2000
Newsletter of the Texas Department of Health discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
April 24, 2000
Creator:
Texas. Department of Health.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
U.S. Department of Energy state energy program: Buildings for the 21st century fact sheet
The U.S. Department of Energy's State Energy Program (SEP) provides leadership to maximize the benefits of energy efficiency and renewable energy through communications/outreach activities, technology deployment, and accessing new partnerships/resources. The State Energy Program operates in all 50 states, the District of Columbia, and the U.S. territories.
Date:
April 24, 2000
Creator:
International, D and R
Object Type:
Book
System:
The UNT Digital Library
UTILIZATION OF LIGHTWEIGHT MATERIALS MADE FROM COAL GASIFICATION SLAGS
The integrated-gasification combined-cycle (IGCC) process is an emerging technology that utilizes coal for power generation and production of chemical feedstocks. However, the process generates large amounts of solid waste, consisting of vitrified ash (slag) and some unconverted carbon. In previous projects, Praxis investigated the utilization of ''as-generated'' slags for a wide variety of applications in road construction, cement and concrete production, agricultural applications, and as a landfill material. From these studies, we found that it would be extremely difficult for ''as-generated'' slag to find large-scale acceptance in the marketplace even at no cost because the materials it could replace were abundantly available at very low cost. It was further determined that the unconverted carbon, or char, in the slag is detrimental to its utilization as sand or fine aggregate. It became apparent that a more promising approach would be to develop a variety of value-added products from slag that meet specific industry requirements. This approach was made feasible by the discovery that slag undergoes expansion and forms a lightweight material when subjected to controlled heating in a kiln at temperatures between 1400 and 1700 F. These results confirmed the potential for using expanded slag as a substitute for conventional lightweight …
Date:
April 24, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library