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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 Cassandra Broadus to Esther Livingston, January 7, 1991]
Photocopy of a letter from Cassandra Broadus, to Esther Livingston, teacher at T.D. Marshall Elementary School. Broadus has gifted Livingston overhead transparencies to be used in Livingston's transportation unit curriculum. The transparencies include, Winslow Homer's Breezing Up (A Fair Wind) and other similar subjects for the elementary school children. Broadus ends the letter by suggesting a class visitation to correlate a lesson plan for the children in arts and language.
Date:
January 7, 1991
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Cassandra Broadus to Anne Sears, March 7 1991]
Photocopy of a letter from Cassandra Broadus, North Texas Institute for Educators on the Visual Arts, to Anne Sears, teacher at T.D. Marshall Learning Center. Broadus has given Sears lesson plans from Kay Alexander's Learning to Look and Create: The SPECTRA Series. Broadus writes that the art curriculum offers numerous ideas for correlating activities with concepts and addresses interdisciplinary curriculum ideas, highlighting some important introductory lesson plans that Broadus believes will be useful for Sears. Lesson plans are missing from letter.
Date:
March 7, 1991
Creator:
Broadus, Cassandra
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
Acceleration using total internal reflection
This report considers the use of a dielectric slab undergoing total internal reflection as an accelerating structure for charged particle beams. We examine the functional dependence of the electromagnetic fields above the surface of the dielectric for polarized incident waves. We present an experimental arrangement for testing the performance of the method, using apparatus under construction for the Grating Acceleration experiment at Brookhaven National Laboratory. 13 refs., 4 figs., 2 tabs.
Date:
June 7, 1991
Creator:
Fernow, R.C.
Object Type:
Report
System:
The UNT Digital Library
Positron lifetimes in solids from first principles calculations
We present a first principles method for calculating positron lifetimes in solids, based on self-consistent calculations using the Linear Muffin-Tin Orbital method. Local density approximations are used for both electron-electron and electron-positron interactions. Results are presented for a variety of elemental metals and vacancies to demonstrate the reliability of this approach. Theoretical calculations of positron lifetimes can be used to interpret experimental data. As an examples of this, we interpret our experimental lifetime data for the oxide superconductor Ba{sub 1-x}K{sub x}BiO{sub 3} using calculations based on this method. 12 refs., 3 figs.
Date:
August 7, 1991
Creator:
Sterne, P. A.; O'Brien, J. C.; Howell, R. H. & Kaiser, J. H.
Object Type:
Article
System:
The UNT Digital Library
Hydrodynamick instabilities on ICF capsules
This article summarizes our current understanding of hydrodynamic instabilities as relevant to ICF. First we discuss classical, single mode Rayleigh-Taylor instability, and nonlinear effects in the evolution of a single mode. Then we discuss multimode systems, considering: (1) the onset of nonlinearity; (2) a second order mode coupling theory for weakly nonlinear effects, and (3) the fully nonlinear regime. Two stabilization mechanisms relevant to ICF are described next: gradient scale length and convective stabilization. Then we describe a model which is meant to estimate the weakly nonlinear evolution of multi-mode systems as relevant to ICF, given the short-wavelength stabilization. Finally, we discuss the relevant code simulation capability, and experiments. At this time we are quite optimistic about our ability to estimate instability growth on ICF capsules, but further experiments and simulations are needed to verify the modeling. 52 refs.
Date:
June 7, 1991
Creator:
Haan, S.W.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0092.0465]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Debbie Blackburn, executive director of the Neighborhood Alliance of Oklahoma City, has resigned, saying the neighborhood advocacy group needs "new blood."
Date:
August 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0139]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "One of the biggest challenges Charlene Cole ever accepted was sewing strips of lace and more than 5,000 beads on a wedding gown."
Date:
November 7, 1991
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0145.0151]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
August 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0144.0384]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Gen. Steve Cortright, Jan Mauritson, Barbara and Jacques DeLier and Mary Jones, from left."
Date:
December 7, 1991
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0145.0150]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
August 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0673]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
September 7, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0155.0516]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Mike Day has been named display advertising sales manager for the Oklahoman, display advertising manager Larry Skoch announced Friday."
Date:
August 7, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0166.0507]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Libby Payne, left, and Susan Douglass birthday luncheon."
Date:
March 7, 1991
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0145.0153]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
August 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0313B.0555]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
April 7, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0312B.0135]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Okmulgee quarterback Waylon Jones is tripped up by Duncan's Chris Harris (320 and Chad Smith (23) close in."
Date:
December 7, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Letter from Jack Davis to Thomas F. Beech, February 7, 1991]
Photocopy of a letter from Jack Davis, co-director of North Texas Institute for Educators on the Visual Arts, to Thomas F. Beech, executive vice president of the Anne Burnett and Charles D. Tandy Foundation. The letter is in regards to previous correspondence between Davis and Beech, where Beech said to submit progress of the institute at the beginning of the year for re-consideration of grant support from the foundation. The letter goes into detailed length of the success of the first year of North Texas Institute for Educators on the Visual Arts.
Date:
February 7, 1991
Creator:
Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
Effective theories and thresholds in particle physics
The role of effective theories in probing a more fundamental underlying theory and in indicating new physics thresholds is discussed, with examples from the standard model and more speculative applications to superstring theory. 38 refs.
Date:
June 7, 1991
Creator:
Gaillard, M. K.
Object Type:
Article
System:
The UNT Digital Library
The Savannah River Site's Groundwater Monitoring Program, second quarter 1990
The Environmental Protection Department/Environmental Monitoring Section (EPD/EMS) administers the Savannah River Site's (SRS) Groundwater Monitoring Program. During second quarter 1990 (April through June) EPD/EMS conducted routine sampling of monitoring wells and drinking water locations. EPD/EMS established two sets of flagging criteria in 1986 to assist in the management of sample results. The flagging criteria aid personnel in sample scheduling, interpretation of data, and trend identification. The flagging criteria are based on detection limits, background levels in SRS groundwater, and drinking water standards. An explanation of flagging criteria for the second quarter is presented in the Flagging Criteria section of this document. All analytical results from second quarter 1990 are listed in this report.
Date:
February 7, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[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.B0246.0210]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Attending Aviation Hal of Fame ceremonies Saturday night are, from left, retired Brig. Gen. Chuck Yeager; Neil Ridley Low, widow of the late Col. Jack Ridley; Harold Cuttliffe Stuart; Jan Maruitson; Doyle Bradford; and Sharon Kiernan, daughter of the late Lt. Col. Leon Robert Vance Jr."
Date:
December 7, 1991
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0334.0373]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
September 7, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History