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Theoretical study of the structure, energetics, and dynamics of silicon and carbon systems using tight-binding approaches
Semiempirical interatomic potentials are developed for silicon and carbon by modeling the total energy of the system using tight-binding approaches. The parameters of the models were obtained by fitting to results from accurate first-principles Local Density Functional calculations. Applications to the computation of phonons as a function of volume for diamond-structured silicon and carbon and the thermal expansions for silicon and diamond yields results which agree well with experiment. The physical origin of the negative thermal expansion observed in silicon is explained. A tight-binding total energy model is generated capable of describing carbon systems with a variety of atomic coordinations and topologies. The model reproduces the total energy versus volume curves of various carbon polytypes as well as phonons and elastic constants of diamond and graphite. The model has also been used in the molecular-dynamics simulation of the properties of carbon clusters. The calculated ground-state geometries of small clusters (C{sub 2}--C{sub 10}) correlates well with results from accurate quantum chemical calculations, and the structural trend of clusters from C{sub 2} to C{sub 60} are investigated. 67 refs., 19 figs.
Date:
October 25, 1991
Creator:
Xu, Chunhui.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Don R. Roberts to Bill McCarter and Jack Davis, October 25, 1990]
Photocopy of a letter from Don R. Roberts, Superintendent of Forth Worth ISD, to Bill McCarter and Jack Davis, co-directors of North Texas Institute for Educators on the Visual Arts. Roberts is writing to confirm Fort Worth ISD's commitment to the North Texas Institute for Educators on the Visual Arts. Their Site Coordinator, Beverly Fletcher, will contribute 15% of her time during the 1992 calendar year to activities related to staff development. Roberts end his letter by congratulating McCarter and Davis for their received grant from the Amon Carter foundation. Cc'd on the letter are, Nancy Timmons and Beverly Fletcher.
Date:
October 25, 1990
Creator:
Roberts, Don R.
Object Type:
Letter
System:
The UNT Digital Library
Monthly energy review, October 1991. [Contains glossary]
This report presents current data on production, consumption, stocks, imports, exports, and prices of the principal energy commodities in the United States. Also included are data on international production of crude oil, consumption of petroleum products, petroleum stocks, and production of electricity from nuclear-powered facilities. 36 figs., 57 tabs.
Date:
October 25, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Clinton, William Jefferson]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
October 25, 1994, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Standeford]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
October 25, 1994, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Telecommunications: Overview of the Cramming Problem
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed Internet-related cramming, which is the inclusion of unauthorized, misleading, or deceptive charges on a consumer's telephone bill, focusing on: (1) the extent of cramming complaints; (2) state and federal regulatory initiatives to protect consumers from cramming; and (3) state and federal enforcement actions against companies engaged in cramming."
Date:
October 25, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Convention for the Protection of Plants : message from the President of the United States transmitting the International Convention for the Protection of New Varieties of Plants of December 2, 1961, as revised at Geneva on November 10, 1972, on October 23, 1978, and on March 19, 1991, and signed by the United States on October 25, 1991
This treaty takes action to control the introduction and spread of pests of plants and plant products. The treaty protects natural as well as cultivated plants, so it has implications for agriculture as well as biodiversity. While the IPPC's primary focus is on plants and plant products moving in international trade, the convention also covers research materials, biological control organisms, and anything else that can act as a vector for the spread of plant pests including containers, soil, vehicles, and machinery.
Date:
October 25, 1995
Creator:
International Union for the Protection of New Varieties of Plants
Object Type:
Text
System:
The UNT Digital Library
[Photograph 2012.201.B0262B.0535]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Bob Plummer of the Plum-Bar Miniature Horse farm in Ada blankets Trisha, a top 10 national champion, during the American Miniature Horse Association National show at the state fairgrounds."
Date:
October 25, 1991
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0228.0388]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Assistant U.S. Attorney John Green, U.S. Attorney Vicki Miles LaHrange and Joe Gallo, U.S. Secret Service agent, display stacks of bogus bills seized after two suspected counterfeiters used homemade currency to purchase a meal in Boise City cafe."
Date:
October 25, 1993
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0246.0215]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OU's Albert Hall and the Memorial Stadium crowd celebrate the wide receiver's TD catch from Cale Gundy during Saturday's 41-3 victory over Kansas."
Date:
October 25, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0246.0155]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Owner Karen Haley says she's closing Han's Barbecue after more than a half-century of business, operated by her family."
Date:
October 25, 1990
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0228.0421]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "R. Lynn Green, City"
Date:
October 25, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0153.0676]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Orchestral Open House -- Carol David, left, and Nancy Apgar at the food table during the Oklahoma City Orchestra League's open house."
Date:
October 25, 1993
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0255.0320]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Alvin Heggs believes in Cavalry coach Charley Rosen."
Date:
October 25, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0245.0948]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Halloween, Pumpkins"
Date:
October 25, 1993
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0089.0055]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Cavalry head coach Henry Bibby, right, shows how to throw a pick on C arl Mitchell."
Date:
October 25, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0111.0529]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Builders Ron Brown and Brent Brewer compare ideas on plans inside the entry of a model home in South Lake Estates.."
Date:
October 25, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0103.0482]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Former Dallas Cowboys director of player personnel Gil Brandt says he's still a Cowboys fan."
Date:
October 25, 1990
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0092.0413]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "In photo above, Peg Maloy, Left, shows off some of her china in her newly remodeled kitchen."
Date:
October 25, 1993
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0091.0709]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 25, 1993
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0103.0480]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Gil Brandt says he is still a Dallas Cowboys fan, and he thinks the Cowboys are on their way back."
Date:
October 25, 1990
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
The Brady Handgun Control Act: Constitutional Issues
The Brady Handgun Control Act established a five-day waiting period for handgun purchases, during which local law enforcement can make reasonable efforts to conduct background checks in available records and block and sales to convicted felons and other disqualified persons. This report reviews the background of federal gun control legislation, analyzes the conflict in the courts over the constitutionality under the Tenth Amendment of the duties placed on local law enforcement, and considers the implications of the decisions for Brady Act enforcement.
Date:
October 25, 1995
Creator:
Schrader, Dorothy
Object Type:
Report
System:
The UNT Digital Library
Iraq-Kuwait: United Nations Security Council Resolutions Test and Votes -- 1991
This report lists the 12 adopted United Nations Security Council resolutions relating to the Iraq-Kuwait situation through October 1991. The texts of these resolutions, along with the votes by members of the Council, are included in this report.
Date:
October 25, 1991
Creator:
Browne, Marjorie Ann
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0322.0195]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 25, 1993
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History