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Advances in high temperature components for AMTEC (alkali metal thermal-to-electric converter)
Long lifetimes are required for AMTEC (or sodium heat engine) components for aerospace and terrestrial applications, and the high heat input temperature as well as the alkali metal liquid and vapor environment places unusual demands on the materials used to construct AMTEC devices. In addition, it is important to maximize device efficiency and power density, while maintaining a long life capability. In addition to the electrode, which must provide both efficient electrode kinetics, transport of the alkali metal, and low electrical resistance, other high temperature components of the cell face equally demanding requirements. The beta{double_prime} alumina solid electrolyte (BASE), the seal between the BASE ceramic and its metallic transition to the hot alkali metal (liquid or vapor) source, and metallic components of the device are exposed to hot liquid alkali metal. Modification of AMTEC components may also be useful in optimizing the device for particular operating conditions. In particular, a potassium AMTEC may be expected to operate more efficiently at lower temperatures.
Date:
December 31, 1991
Creator:
Williams, R. M.; Jeffries-Nakamura, B.; Underwood, M. L.; Ryan, M. A.; O`Connor, D. & Kikkert, S.
Object Type:
Article
System:
The UNT Digital Library
Chemically Assisted in Situ Recovery of Oil Shale. [Quarterly Report], October 1, 1991--December 31, 1991
The objective of this work is to investigate, in the laboratory, the parameters associated with a chemically assisted in situ recovery procedure, using hydrogen chloride (HCI), carbon dioxide (CO{sub 2}), and steam (H{sub 2}O), to obtain data useful to develop a process more economic than existing processes and to report all findings. The technical progress of the project is reported. The project status is that the solutions to the problems discussed in the third quarter status, were found to function satisfactorily. Future needs have been considered, and appropriate equipment and instrumentation changes have been designed. Only one experiment was performed this quarter, with some improvement over the previous experiments. The increase in shale oil recovery followed directly from the changes discussed last quarter, but the improvement could have been larger with wider-spread implementation of the changes. Equipment was purchased to rectify the need, and will be installed shortly. Further, a minor change in the design was necessary to account for the brittleness of high temperature electrical resistance heating tapes. The focus of the work this quarter has been on the development of computer software to enable the use of on-line parameter identification, the design of the instrumentation necessary to adequately …
Date:
December 31, 1991
Creator:
Ramirez, W. F.
Object Type:
Report
System:
The UNT Digital Library
Role of polycrystallinity in CdTe and CuInSe{sub 2} photovoltaic cells. Annual subcontract report, 1 April 1990--31 March 1991
The polycrystalline nature of thin-film CdTe and CuInSe{sub 2} solar cells continues to be a major factor in several individual losses that limit overall cell efficiency. This report describes progress in the quantitative separation of these losses, including both measurement and analysis procedures. It also applies these techniques to several individual cells to help document the overall progress with CdTe and CuInSe{sub 2} cells. Notably, CdTe cells from Photon Energy have reduced window photocurrent losses to 1 mA/Cm{sup 2}; those from the University of South Florida have achieved a maximum power voltage of 693 mV; and CuInSe{sub 2} cells from International Solar Electric Technology have shown a hole density as high as 7 {times} 10{sup 16} cm{sup {minus}3}, implying a significant reduction in compensation. 9 refs.
Date:
December 31, 1991
Creator:
Sites, J. R.
Object Type:
Report
System:
The UNT Digital Library
Spectroscopic diagnostics of high temperature plasmas, January 1, 1991--December 31, 1991
During 1991, the activities of the John Hopkins University Plasma Spectroscopy Group have covered several areas of research, in the domain of XUV spectroscopy of magnetically confined fusion plasmas. While the main effort concentrated on the development of novel diagnostics which utilize Layered Synthetic Microstructures (LSMs) as the dispersive/filtering elements, work has been done in the area of detector development and the physics of the tokamak edge plasma. An XUV monochromator for the 20--200{Angstrom} range, which uses flat LSMs, has been built and is currently operated on the D3-D tokamak at General Atomics in San Diego. A design for a follow-up experiment at D3-D is now in progress. As a preliminary step toward tokamak plasma imaging in the XUV wavelength range using curved LSM coated substrates, a prototype XUV camera was built and operated in our laboratory in image the A1 3 emission at {lambda}-175{Angstrom} from a Penning Ionization Discharge plasma. Based on these laboratory results, the design of the XUV camera, which will image plasma in the Phaedrus T tokamak O VI emission (150{Angstrom}), has been completed. This instrument is presently under construction. Also a detailed design of a system composed of four LSM based imaging devices for N{sub …
Date:
December 31, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Texas Attorney General Opinion: DM-71
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification; Authority of public housing authority to regulate tenants' legal possession of firearms (RQ-150)
Date:
December 31, 1991
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: DM-72
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification; Whether the Dallas City Council may control the use of funds confiscated pursuant to the assest forfeiture law (RQ-114)
Date:
December 31, 1991
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 51, Number 26, December 28, 1991
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas. This issue includes the {{{annual/mid-year}}} index for YYYY.
Date:
December 28, 1991
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 16, Number 96, Pages 7665-7762, December 27, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 27, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 16, Number 95, Pages 7573-7664, December 24, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 24, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Floodplain Management Newsletter, Volume 9, Number 30, Winter 1991
Newsletter issued by the Texas Division of Emergency Management discussing news, events, statistics, and other relevant information related to flood preparedness in Texas.
Date:
Winter 1991
Creator:
Texas. Division of Emergency Management.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
LRCA Economic Development Quarterly Update, Volume 1, Number 2, Winter 1991
Quarterly report of Lower Colorado River Authority describing news related to their recent economic developments.
Date:
Winter 1991
Creator:
Lower Colorado River Authority
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
NewsLine, Volume 23, Number 2, Winter 1991
Newsletter issued by the Texas Council on Vocational Education discussing news, events, and other relevant information related to technical and vocational education for adults in Texas.
Date:
Winter 1991
Creator:
Texas Council on Vocational Education
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Shores, Volume 23, Number 3, Fall/Winter 1991
Quarterly magazine of the Texas Sea Grant College Program discussing news, events, and other information related to the Texas marine environment.
Date:
Winter 1991
Creator:
Texas A & M University. Sea Grant College Program.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas State Board Report, Volume 39, Winter 1991
Monthly newsletter from the Texas State Board of Public Accountancy regarding updates and information pertaining to Texas CPAs.
Date:
Winter 1991
Creator:
Texas State Board of Public Accountancy
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Water Source, Winter 1991
Quarterly newsletter of the Edwards Underground Water District discussing news and activities of the organization as well as other information related to water in southern Texas.
Date:
Winter 1991
Creator:
Edwards Underground Water District (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Summary of All Reported Accidents in Rural Areas of Texas for November 1991
Monthly report providing tabular statistical information about motor vehicle accidents in rural areas of Texas during 1991, with data broken out by various criteria including number of persons, locations, types of accidents, time of day, and other factors.
Date:
December 20, 1991
Creator:
Texas. Department of Public Safety. Statistical Services.
Object Type:
Report
System:
The Portal to Texas History
Summary of All Reported Accidents in the State of Texas for November 1991
Monthly report providing tabular statistical information about motor vehicle accidents in Texas during 1991, with data broken out by various criteria including number of persons, locations, types of accidents, time of day, and other factors.
Date:
December 20, 1991
Creator:
Texas. Department of Public Safety. Statistical Services.
Object Type:
Report
System:
The Portal to Texas History
Texas Parks & Wildlife News, December 20, 1991
Weekly newsletter discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
December 20, 1991
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 16, Number 94, (Part I), Pages 7391-7467, December 20, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 20, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 16, Number 94, (Part II), Pages 7469-7573, December 20, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 20, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Attorney General Opinion: DM-70
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification; Whether Local Government Code section 252.024 in itself exempts municipal purchases of excess or surplus insurance from competitive bidding, and related questions (RQ-127)
Date:
December 18, 1991
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Register, Volume 16, Number 93, Pages 7271-7389, December 17, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 17, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 51, Number 25, December 14, 1991
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
December 14, 1991
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Parks & Wildlife News, December 13,1991
Weekly newsletter discussing natural resources, parks, hunting and fishing, and other information related to the outdoors in Texas.
Date:
December 13, 1991
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History