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584 Matching Results
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Review of state-of-the-art of solar collector corrosion processes. Task 1 of solar collector studies for solar heating and cooling applications. Final technical progress report
The state-of-the-art of solar collector corrosion processes is reviewed, and Task 1 of a current research program on use of aqueous heat transfer fluids for solar heating and cooling is summarized. The review of available published literature has indicated that lack of quantitative information exists relative to collector corrosion at the present time, particularly for the higher temperature applications of solar heating and cooling compared to domestic water heating. Solar collector systems are reviewed from the corrosion/service life viewpoint, with emphasis on various applications, collector design, heat transfer fluids, and freeze protection methods. Available information (mostly qualitative) on collector corrosion technology is reviewed to indicate potential corrosion problem areas and corrosion prevention practices. Sources of limited quantitative data that are reviewed are current solar applications, research programs on collector corrosion, and pertinent experience in related applications of automotive cooling and non-solar heating and cooling. A data bank was developed to catalog corrosion information. Appendix A of this report is a bibliography of the data bank, with abstracts reproduced from presently available literature accessions (about 220). This report is presented as a descriptive summary of information that is contained in the data bank.
Date:
April 11, 1980
Creator:
Clifford, J E & Diegle, R B
Object Type:
Report
System:
The UNT Digital Library
Multi-temperature gas chromatography using isothermal columns in series. Technical report
A computer-controlled three-oven gas chromatograph having a multi-position stream-switching valve has been used first to divide a wide-boiling mixture of n-alkanes into three cuts and then to fractionate each cut using a packed column at a different temperature. After initial injection of the sample into the highest temperature column, the low boilers were switched to a low temperature oven. Then, the mid-boilers were switched to a column at an intermediate temperature. For routine repetitive analyses, the multi-oven approach offers an attractive alternative.
Date:
August 11, 1980
Creator:
Spencer, W. A. & Rogers, L. B.
Object Type:
Report
System:
The UNT Digital Library
Heating by the Raman instability
Computer simulations are presented of the reflection and heating due to stimulated Raman backscatter of intense laser light in large regions of underdense plasma. The heated electron distribution is found to be approximately a Maxwellian of temperature (m/sub e//2)v/sub p//sup 2/, where v/sub p/ is the phase velocity of the electron plasma wave. A simple model of the reflection is presented. Raman may cause a pre-heat problem with large laser fusion reactor targets.
Date:
April 11, 1980
Creator:
Estabrook, K.G. & Kruer, W.L.
Object Type:
Article
System:
The UNT Digital Library
Study of corrosion in multimetallic systems. Task 2 of solar collector studies for solar heating and cooling applications. Final technical progress report
Corrosion measurements were made on candidate alloys of construction for non-concentrating solar collectors under simulated conditions of collector operation. Materials evaluated were aluminum alloys 1100, 3003, and 6061, copper alloy 122, Type 444 stainless steel, and 1018 plain carbon steel. The solutions used were equivolume mixtures of ethylene glycol and water, and propylene glycol and water. They were used without corrosion inhibitors but with addition of chloride, sulfate, and bicarbonate ions. The influences of dissolved oxygen, solution flow velocity, and heat transfer were evaluated. Corrosion morphologies investigated were general attack, pitting, crevice corrosion, and galvanic corrosion. Experimental results indicated that aluminum alloys can experience severe pitting and crevice corrosion at chloride concentrations approaching 50 ppM. The corrosion rate of copper exceeded about 100 ..mu..m/yr in ethylene glycol solutions and about 80 ..mu..m/yr in propylene glycol solutions. Crevice corrosion was not observed for copper, but severe galvanic corrosion occurred when it was coupled to T444 stainless steel. T444 steel corroded at rates of less than 1 ..mu..m/yr under all exposure conditions. During circulation at 100 C in the presence of air, ethylene glycol solutions acidified because of degradation of the glycol. The initial pH of propylene glycol solutions was already low, …
Date:
April 11, 1980
Creator:
Diegle, R B
Object Type:
Report
System:
The UNT Digital Library
Mechanical model for ductility loss
A mechanical model was constructed to probe into the mechanism of ductility loss. Fracture criterion based on critical localized deformation was undertaken. Two microstructure variables were considered in the model. Namely, the strength ratio of grain boundary affected area to the matrix, ..cap omega.., and the linear fraction, x, of grain boundary affected area. A parametrical study was carried out. The study shows that the ductility is very sensitive to those microstructure parameters. The functional dependence of ductility to temperature as well as strain-rate, suggested by the model, is demonstrated to be consistent with the observation.
Date:
February 11, 1980
Creator:
Hu, W.L.
Object Type:
Article
System:
The UNT Digital Library
[North side of Administration Building at North Texas State University #1]
Photograph of the exterior of the Hurley Administration Building at North Texas State University. The photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building is visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking path leading to the Administration Building.
Date:
March 11, 1980
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[North side of Administration Building at North Texas State University #2]
Photograph of the exterior of the Hurley Administration Building at North Texas State University. This photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building and Chemistry Building are visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking paths leading through the campus.
Date:
March 11, 1980
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[North side of Administration Building at North Texas State University #3]
Photograph of the exterior of the Hurley Administration Building at North Texas State University. This photograph, apparently taken from the roof of another building, depicts the Administration Building's north side and main entrance. In the left foreground is the Information Sciences Building; the Biology Building and Chemistry Building are visible in the right foreground. In the left background behind the Administration Building is the Kerr Hall dormitory complex; the A. M. Willis Library is visible in the right background. People are visible on the concrete walking paths leading through the campus.
Date:
March 11, 1980
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Target factory in perspective
A target factory diagram has been constructed for an analysis of the shell coating process system in relation to target production. The number of deposition units needed to achieve the coating requirements will be a major target production operating cost.
Date:
April 11, 1980
Creator:
Sherohman, J.W. & Hendricks, C.D.
Object Type:
Article
System:
The UNT Digital Library
Systematic efficiency enhancement in Monte Carlo applications. Final progress report, July 1, 1976-January 31, 1980
Research performed under the grant period has been undertaken as part of the principal investigator's long-term efforts to develop new, more efficient estimators for application to a wide variety of practical problems. Two rather different approaches have characterized the work: (1) the use of a multistage analysis (1) to optimize the efficiencies (variances) of families of estimating random variables in a traditional statistical Monte Carlo framework, and (2) the development of parallel quasi-random sampling techniques and corresponding deterministic error bounds.
Date:
June 11, 1980
Creator:
Spanier, J.
Object Type:
Report
System:
The UNT Digital Library
Methodology for assessing the impacts of alternative rate designs on industrial energy use. Draft report
A task was undertaken to develop a method for analyzing industrial user responses to alternative rate designs. The method described considers the fuel switching and conservation responses of industrial users and the impact to a hypothetical utility regarding revenue stability, annual gas demand, and seasonal fluctuations. Twenty-seven hypothetical industrial plant types have been specified. For each combustor in the plant, the fuel consumption by season, initial fuel type, fuel switching costs, conservation costs, and amount of fuel conservable is provided. The decision making takes place at the plant level and is aggregated to determine the impact to the utility. Section 2 discusses the factors affecting an industrial user's response to alternative rate designs. Section 3 describes the methodology, includes an overview of the model and an example industrial user's response to a set of fuel prices. The data describing the 27 hypothetical firms is in an appendix.
Date:
January 11, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 72, No. 50, Ed. 1 Thursday, December 11, 1980
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 11, 1980
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 72, No. 37, Ed. 1 Thursday, September 11, 1980
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
September 11, 1980
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Missing girl]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
May 11, 1980, 5:30 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bill Cullen]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 11, 1980, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Clements]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 11, 1980, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Taxes]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 11, 1980, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Funeral]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 11, 1980, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Porn Trial]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 11, 1980, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Best Actor]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 11, 1980, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Fort Worth School Board]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 11, 1980, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Beef prices]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 11, 1980, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Church moves]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 11, 1980, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Dallas City Council]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 11, 1980, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library