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94
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63
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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
Low-cost solar array project. Task I. Silicon material. Investigation of the hydrogenation of SiCl/sub 4/
Reaction kinetic measurements on the hydrochlorination of SiCl/sub 4/ and m.g. silicon metal were last reported as a function of reaction temperature, reactor pressure, H/sub 2//SiCl/sub 4/ ratio and silicon metal particle size distribution, 3 SiCl/sub 4/ + 2 H/sub 2/ + Si reversible 4 SiHCl/sub 3/. The effect of impurities in the m.g. silicon metal on the rate of this reaction has been investigated in this quarter. The m.g. silicon was replaced with high purity, electronic grade silicon metal in the hydrochlorination reaction. With electronic grade Si, the reaction rate was found to be about one order of magnitude slower than those obtained with m.g. silicon metal. These metallic impurities in the m.g. silicon appear to have a catalytic effect. Addition of 5 wt% cuprous chloride to the electronic grade Si mass bed increased the reaction rate to the same level as those obtained with m.g. silicon with 5% CuCl added. The effect of prolonged reaction time on the hydrochlorination reaction was studied. The plan is to run the reaction for long periods of time with the objective of studying the life of the Si mass bed. No significant change in the reaction rate was observed after about 80 …
Date:
October 7, 1980
Creator:
Mui, J. Y. P. & Seyferth, D.
Object Type:
Report
System:
The UNT Digital Library
Federal Government Health, Education, and Welfare Programs of Assistance to American Indians Residing on Federal Reservations
This report lists and describes federal health, education, and welfare programs available to Native Americans living on federal reservations.
Date:
October 7, 1969
Creator:
Langone, Stephen A.
Object Type:
Report
System:
The UNT Digital Library
Design studies of a laser fusion power plant
The conceptual design of a laser fusion power plant has been undertaken to exploit recent developments in target design. Advanced high-gain targets which have been developed make it possible to significantly relax the laser and optical system requirements. The power plant design features a reactor concept which utilizes a thick falling region of liquid lithium to protect the first-wall from the neutrons, x-rays, and charged particles that are produced in the thermonuclear microexplosion. The lithium waterfall has also been designed to be thick enough to significantly reduce the effects of 14 MeV neutrons and cyclical stresses on the blanket structure; thereby allowing us to consider smaller blanket structures which could last the lifetime of the plant. Fusion targets producing 700 MJ of thermonuclear energy are ignited by a 2 percent efficient, 1 MJ laser system at the rate of 1.4 Hz. Schemes for protecting the final focusing optics are described which are both compatible with this reactor system, and show promise of surviving a full year in order to minimize costly downtime.
Date:
October 7, 1977
Creator:
Maniscalco, J. A.; Meier, W. R. & Monsler, M. J.
Object Type:
Article
System:
The UNT Digital Library
MTX (Microwave Tokamak Experiment) facility and machine grounding plan
A key issue in the design of fusion research experiments and their related facilities is the control of ground currents. Because of the large magnetic field, high voltages and high currents present in most of these installations, it is essential to avoid ground loops, and to control ground currents during both normal operations and fault conditions. This paper describes the grounding policy that was developed for MTX. The vault area was divided into zones, and each of the four walls was treated as a separate grounding area. Cable runs and magnet buss bars were run into the machine radially. The paper also describes the steps taken to isolate diagnostic signals and power for pumps and instruments. The paper outlines some of the field calculations used to predict problem areas, and to reveal voltage isolation levels that were required. The paper includes the active ground fault detection system used to insure the integrity of the ground system. 2 refs., 5 figs.
Date:
October 7, 1987
Creator:
Bell, H.H.; Rice, B.W.; Petersen, D.E. & Herrera, C.H.
Object Type:
Article
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
Magnet power system for the Microwave Tokamak Experiment (MTX)
The system configuration, layout, and general philosophy for the MTX magnet power system is described. The vast majority of the magnet power equipment was quite successfully used on the ALCATOR-C experiment at the Massachusetts Institute of Technology. The AC power for the magnet system at MIT was obtained from a 225MVA alternator. The power for the system at LLNL is obtained directly from the local utility's 230 kV line. This installation, therefore, necessitates the addition of a great deal of equipment in ranges from new switchgear in the substation to using existing switchgear obtained from MIT as contractors for intershop electrical isolation as well as safety isolation for personnel entry into the experimental area. Additionally, some discussion is made of the unique layout of this facility and the tradeoffs made to accommodate them. 2 refs., 6 figs.
Date:
October 7, 1987
Creator:
Jackson, M.C. & Musslewhite, R.C.
Object Type:
Article
System:
The UNT Digital Library
SPE water electrolysis technology development for large scale hydrogen production. Progress report No. 4, June 15, 1976--September 30, 1976
Porous carbon fiber paper was selected as the cathode membrane and electrode assembly support based on over 1200 hr operational evaluation. Three potential anode supports are under test. All three appear technically satisfactory after 500 to 1200 hr operational evaluation on each. Optimization of molds and molding techniques for a foil backed ribbed carbon collector of bipolar design, including ribbed flow fields, manifolds, ports and sealing surfaces, is in process. Over 2800 hr demonstrated at 300/sup 0/F on platinum screened cell. Over 2200 hr demonstrated at 300/sup 0/F on cell with carbon cloth cathode current collector. Forty-eight hours screening tests of 56 different anode catalysts have been completed. A 500-hr life test program of 12 anode catalyst types which showed promise on the screening tests has been started. Attempts to stabilize RuO/sub x/ for use as an anode catalyst are being pursued. Low loaded cathodes on graphite substrates show performance to within 25 MV of baseline. Optimization of substrate thickness and fabrication procedures is continuing. Twenty-five low loaded anodes catalyst/substrate combinations have all shown poor performance stability with time. Continued development of the grafted TFS membrane has shown greatly improved physical characteristics and encouraging performance for samples in the 25 …
Date:
October 7, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Analysis of three-phase power-supply systems using computer-aided design programs
A major concern of every designer of large, three-phase power-supply systems is the protection of system components from overvoltage transients. At present, three computer-aided circuit design programs are available in the Magnetic Fusion Energy (MFE) National Computer Center that can be used to analyze three-phase power systems: MINI SCEPTRE, SPICE I, and SPICE II. These programs have been used at Lawrence Livermore Laboratory (LLL) to analyze the operation of a 200-kV dc, 20-A acceleration power supply for the High Voltage Test Stand. Various overvoltage conditions are simulated and the effectiveness of system protective devices is observed. The simulated overvoltage conditions include such things as circuit breaker openings, pulsed loading, and commutation voltage surges in the rectifiers. These examples are used to illustrate the use of the computer-aided, circuit-design programs discussed in this paper.
Date:
October 7, 1977
Creator:
Oberst, E.F.
Object Type:
Article
System:
The UNT Digital Library
Flight tests of thermal ice-prevention equipment in the XB-24F airplane
Report presenting performance tests of thermal ice-prevention equipment designed and installed in the XB-24F airplane in icing and non-icing conditions. The recorded temperature and air-flow data, and the calculated quantities of heat flow throughout the system are presented in tabular form.
Date:
October 7, 1943
Creator:
Neel, Carr B. & Jones, Alun R.
Object Type:
Report
System:
The UNT Digital Library
Comparison of the performance of a helicopter-type ram-jet engine under various centrifugal loadings
Report presenting an investigation of an 18-foot-radius helicopter rotor powered by tip-mounted ramjet engines in the helicopter test tower. The engine performance is compared with the performance determined in a previous investigation of a 9-foot-radius rotor with the same engines at similar speeds but with twice the centrifugal forces. Results regarding the propulsive characteristics, minimum specific fuel consumption and corresponding propulsive thrust, and operational characteristics are provided.
Date:
October 7, 1953
Creator:
Radin, Edward J. & Carpenter, Paul J.
Object Type:
Report
System:
The UNT Digital Library
Answer11_022820051206
Query Results
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0111 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0111 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0112 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0112 - Scenario (Not Candidate Recommendation). Contains C5, and C8 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0114 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0114 - Scenario (Not Candidate Recommendation). Contains C5, C6, C7, and C8 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0116 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0116 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0117 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0117 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0119 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0119 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0120 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0120 - Scenario (Not Candidate Recommendation). Contains C5, C6, C7, and C8 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0121 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0121 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
DON-0122 - Scenario (Not Candidate Recommendation)
Disregard Restriction of Header and Footer: DON-0122 - Scenario (Not Candidate Recommendation). Contains C5 data.
Date:
October 7, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Government Shutdown: Operations of the Department of Defense During a Lapse in Appropriations
This report provides an overview of guidelines that have governed planning for Department of Defense (DOD) operations over the last 30 years in the event of a funding lapse. It also discusses the implications of the guidelines for a possible impending shutdown and briefly reviews what is known about current DOD planning for a shutdown.
Date:
October 7, 2013
Creator:
Towell, Pat & Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Federally Chartered Corporation: Financial Statement Audit Reports for the Reserve Officers Association of the United States for Fiscal Years 2004 and 2003
Correspondence issued by the Government Accountability Office with an abstract that begins "GAO reviewed the audit reports covering the financial statements of the Reserve Officers Association of the United States for Fiscal Years 2003 and 2004. GAO found no reportable instances of noncompliance. The audit reports included the auditors' opinions that the financial statements of the corporation were presented fairly in accordance with U.S. generally accepted accounting principles."
Date:
October 7, 2005
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Green Affordable Housing: HUD Has Made Progress in Promoting Green Building, but Expanding Efforts Could Help Reduce Energy Costs and Benefit Tenants
A letter report issued by the Government Accountability Office with an abstract that begins "Rising energy prices and concerns about the environment have fueled interest in "green building"--resource-efficient construction and maintenance practices that reduce adverse impacts on the natural environment. The Department of Housing and Urban Development (HUD), spends an estimated $5 billion on energy costs annually in its affordable housing programs and has recently taken steps to reduce its energy costs. GAO was asked to review (1) HUD's efforts to promote energy efficiency in its programs and the use of performance measures, (2) potential costs and long-term benefits of green building in HUD's affordable housing programs, and (3) lessons learned elsewhere that HUD could use to promote green building. GAO reviewed HUD program documents and studies on green building, interviewed HUD officials and industry representatives, and made site visits to locations that use green building practices."
Date:
October 7, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library