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Exploring novel silicon-containing polymers---From preceramic polymers to conducting polymers with nonlinear optical properties
Several new types of silicon-containing preceramic polymers, i.e., poly(diorganosilacetylene) and poly(diorganosilvinylene) have been synthesized with molecular weights from 10,000 to 120,000. These polymers could be thermally converted to SiC with a moderate to high char yields. Ready solubility and good processability made these types of polymers attractive in their applications to ceramics. The thermal polymerization of diethynyldiphenyl-silane, which was reported in 1968 to afford poly(diphenylsilyldiacetylene) via dehydrogenation, was reinvestigated. Spectroscopic studies showed that the polymer had a structure of polyacetylene type not diacetylene. Diphenyldiethynylgermane and a series of diorganodiethynylsilances were synthesized. These could be polymerized in the presence of MoCl{sub 5} or WCl{sub 6} to afford a soluble, violet material with Mw as high as 108,000. 100 refs., 56 figs., 16 tabs.
Date:
October 7, 1991
Creator:
Pang, Yi.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Jack Davis and Bill McCarter to Melba Davis Whatley, October 7, 1992]
Photocopy of a letter from Jack Davis and Bill McCarter, co-directors of North Texas Institute for Educators on the Visual Arts, to Melba Davis Whatley. The letter is in regards to a discussion over advocacy programs and wanting to discuss these ideas with school board members / political leaders to have them look in depth at the discipline-based art education and what contributions it makes to the education of the students. Davis and McCarter mention the Texas Association of School Boards, TASB and believe they could be used a vehicle for doing most of the ground work on advocacy. If NTIEVA works with TASB now they can get a presentation together on art education for their annual conference. Davis and McCarter end the letter by thanking Whatley for her ideas and to contact them if she has any others. Copied on the letters are Leilani Lattin Duke, Vicki Rosenberg and M'Lou Bancroft, faculty of the Getty Center. Scribbled at the end of the letter reads, "Mrs. Whatley, I will be in Austin on October 29 and 30. If you'd like to discuss this, perhaps we ... have dinner on Thursday evening. Jack"
Date:
October 7, 1992
Creator:
Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
A miniature inexpensive, oxygen sensing element
An exhaustive study was conducted to determine the feasibility of Nernst-type oxygen sensors based on ceramics containing Bi{sub 2}O{sub 3}. The basic sensor design consisted of a ceramic sensing module sealed into a metal tube. The module accommodated an internal heater and thermocouple. Thermal-expansion-matched metals, adhesives, and seals were researched and developed, consistent with sequential firings during sensor assembly. Significant effort was devoted to heater design/testing and to materials' compatibility with Pt electrodes. A systematic approach was taken to develop all sensor components which led to several design modifications. Prototype sensors were constructed and exhaustively tested. It is concluded that development of Nerst-type oxygen sensors based on Bi{sub 2}O{sub 3} will require much further effort and application of specialized technologies. However, during the course of this 3-year program much progress was reported in the literature on amperometric-type oxygen sensors, and a minor effort was devoted here to this type of sensor based on Bi{sub 2}O{sub 3}. These studies were made on Bi{sub 2}O{sub 3}-based ceramic samples in a multilayer-capacitor-type geometry and amperometric-type oxygen sensing was demonstrated at very low temperatures ({approximately} 160{degree}C). A central advantage here is that these types of sensors can be mass-produced very inexpensively ({approximately} 20--50 cents …
Date:
October 7, 1991
Creator:
Arenz, R. W.
Object Type:
Report
System:
The UNT Digital Library
Faculty Recital: 1995-10-07 - Robert Davidovici, violin; Carter Enyeart, cello; and Ellen Ritscher, harp
Access:
Use of this item is restricted to the UNT Community
A Faculty recital performed in the UNT College of Music Recital Hall.
Date:
October 7, 1995
Creator:
Davidovici, Robert; Enyeart, Carter & Ritscher, Ellen
Object Type:
Sound
System:
The UNT Digital Library
Faculty Recital: 1991-10-07 - S. Bancroft (bassoon); M. K. Clardy (flute); J. Mainous (piano); D. Richtmeyer (alto saxophone)
Access:
Use of this item is restricted to the UNT Community
Faculty recital performed at the UNT College of Music Recital Hall.
Date:
October 7, 1991
Creator:
Bancroft, Sue; Clardy, Mary Karen; Mainous, Jean & Richtmeyer, Debra
Object Type:
Sound
System:
The UNT Digital Library
U.S. Customs Service: Update on the Merchandise Processing Fee
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on Custom Service's Merchandise Processing Fee (MPF) that is charged on certain imports, focusing on the relationship between the fee and the cost of services provided."
Date:
October 7, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
[Photograph 2012.201.B0140.0338]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Members of the governor's color guard march past students of Columbus Elementary School on Thursday during a ceremony to discourage gangs and use of drugs."
Date:
October 7, 1993
Creator:
Faytinger, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0175.0003]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 7, 1994
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0339]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 7, 1993
Creator:
Faytinger, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0323]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Douglass QB Mike Colston is sacked in the end zone for a safety by El Reno's Roger Steffen during 2nd quarter action."
Date:
October 7, 1994
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0354]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A first-year veterinary medicine student at age 51, of Edmond examines a cat at the Oklahoma State University small animal clinic in Stillwater."
Date:
October 7, 1993
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0353]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 7, 1993
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0334.0375]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Rev Michael J. Kinnamon a seminary dean from Lexington, Ky is at the center of a debate over homosexuality as the General Assembly of the Christian Church (Disciples of Christ) convenes in Tulsa."
Date:
October 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0302]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Craig Knutsen / Southwestern Bell staff economist"
Date:
October 7, 1993
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0099]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Auctioneer Robert Hawks touts the merits of hand tools up for sale as his audience looks on with interest."
Date:
October 7, 1994
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0256.0451]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma State Senate Minority Leader - Howard Hendrick"
Date:
October 7, 1994
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0255.0475]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Shoe Leh, left, and Health for Friends director Kathy Heiple, right, visit with dental patient Coker Lee Priddy of Moore"
Date:
October 7, 1992
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0248.0273]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Karen and Mark Hanstein left, and Cathy and Steve Gray greet guests at the Birthday party honoring Mark and Steve."
Date:
October 7, 1994
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0250.0428]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mrs. Guy Fraser Harrison and Ed Glotzbach visit at the youth concert."
Date:
October 7, 1990
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0352]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A first-year veterinary medicine student at age 51, of Edmond examines a cat at the Oklahoma State University small animal clinic in Stillwater."
Date:
October 7, 1993
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0175.0001]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "There was a time when Edna Carr Edmondson really had to struggle with her studies -- but that was 60 years ago."
Date:
October 7, 1994
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0175.0002]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 7, 1994
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0250.0600]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dave Harris"
Date:
October 7, 1994
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0116.0509]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Rosemary Burkholder relaxes with her Japanese Akita dog."
Date:
October 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History