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1,628 Matching Results
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Energy-dependent losses in pulsed-feedback preamplifiers
Energy dependent counting losses occur in most pulsed-feedback preamplifiers due to the loss of those pulses which activate the recharge system. A pulsed-feedback system that overcomes this inefficiency is described. Pulsed-light feedback as used with germanium gamma-ray spectrometers is discussed as used at high energies and high rates where those losses become significant. Experimental results are presented.
Date:
November 1, 1978
Creator:
Landis, D. A.; Madden, N. W. & Goulding, F. S.
Object Type:
Article
System:
The UNT Digital Library
Infrared absorption spectroscopy of carbon monoxide on nickel films: a low temperature thermal detection technique
Sensitive vibrational spectra of carbon monoxide molecules adsorbed on evaporated nickel films have been measured by attaching a thermometer to the sample, cooling the assembly to liquid helium temperatures, and recording the temperature changes which occur when infrared radiation is absorbed. The measurements are made in an ultrahigh vacuum chamber in which the sample surface can be cleaned, heated, exposed to gas molecules and cooled to 1.6 K for the infrared measurements. The spectra of chemisorbed CO molecules are interpreted in terms of the linear and bridge adsorption sites on the nickel surface, and they show how the distribution of molecules among these sites changes when the CO coverage increases and intermolecular forces become important. The spectra of physically adsorbed molecules in both monolayer and multilayer films are also reported. Absorptions as small as five parts in 10/sup 5/ of the incident radiation can presently be detected in spectra covering broad bands of infrared frequencies with a resolution of 2 cm/sup -1/. This high sensitivity is attributable to the low noise and reduced background signal of the thermal detection scheme, to the stability of the rapid scan Fourier transform infrared spectrometer, and to the automated computerized data acquisition electronics. Better …
Date:
November 1, 1978
Creator:
Bailey, R.B.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Rabies]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 16, 1978, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Audio only]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 1978
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: School teams]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 1, 1978, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Roseland]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 15, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Water]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 16, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Davis Case]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 21, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Dealey Plaza]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 26, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Smokeout]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 16, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Brown Berets]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 25, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Absentee Voting]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 3, 1978, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Farm Meeting]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 27, 1978, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Rabies III]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 1978
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Insurance]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 30, 1978, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: School Teams]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 1, 1978, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Jazz band]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
November 29, 1978, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Cadmium sulfide/copper sulfide heterojunction cell research. Technical progress report No. 4, July 1-September 30, 1978
Important advances have been made in five technical areas during this quarter: topological investigations of film materials and cells, characterization of current transport and collection in Cu/sub 2/S/CdS cells, preparation and application of small area film cells, correlation of photoresponse image and structural features in film cells and means of preparing (CdZn)S alloy films. The use of potassium cyanide etching of Cu/sub 2/S layers on polycrystalline CdS films defined areas 1 to 5 ..mu..m across with the latter covering 30 to 50% of the surfaces studied. Large grains may strongly reduce short circuit current levels. Laser scanned photocurrent response of tapered Cu/sub 2/S layers on single crystal CdS has been refined to directly treat photocurrent-transmission data, allowing more firm estimates of lifetime, surface recombination velocity and heterojunction collection efficiency. Delineation of small area film cells has been done successfully using photolithographic methods. As used, these methods have no deleterious influence on cell behavior. With arrays of small cells on a single substrate it was possible to establish that increased junction opposing current (lower V/sub OC/) results from longer immersions in CuCl during Cu/sub 2/S formation. Patterns of high response in laser-scanned photocurrent images have been correlated with SEM images of …
Date:
November 20, 1978
Creator:
Szedon, J. R.; Shirland, F. A.; Biter, W. J.; Stoll, J. A.; Dickey, H. C. & O'Keeffe, T. W.
Object Type:
Report
System:
The UNT Digital Library
Potential contribution of solar energy in the Northwest
Estimates on the ability of solar energy to supply US energy needs vary from 0 to 25%. It is generally thought that solar can supply as much as we want it to up to 25% in the Northwest by the year 2000 providing an all-out effort is applied now to develop solar energy. The factors affecting the extent of solar utilization are discussed; they are more institutional (inertia, experience, legal, social) than technological or economical. Because of its climate, unique power system, and amount of sunshine, the Northwest is one of the best places in the US for solar energy utilization. Solar energy used in the Northwest is more likely to meet needs that would otherwise be met by new thermal electric plants than is the case in most places.
Date:
November 8, 1978
Creator:
Drumheller, K.
Object Type:
Article
System:
The UNT Digital Library
Financing of a commercial geothermal development: an operator's objectives and constraints
Phillips' objectives related to financing a geothermal development are: (1) to make a reasonable profit, (2) to keep risks in line with potential benefits, and (3) to operate in a free and open market. Each of these objectives is discussed briefly. (MHR)
Date:
November 30, 1978
Creator:
Harban, D.C.
Object Type:
Article
System:
The UNT Digital Library
Fourth quarterly report on Development of a model and computer code to describe solar grade silicon production processes, July 1--September 30, 1978
This program aims at developing a mathematical model, and a computer code based on this model, which will allow prediction of the product distribution in chemical reactors in which gaseous silicon compounds are converted to condensed-phase silicon. The reactors to be modeled are flow reactors in which silane or one of the halogenated silanes is thermally decomposed or reacted with an alkali metal, H/sub 2/ or H atoms. Because the product of interest is particulate silicon, processes which must be modeled, in addition to mixing and reaction of gas-phase reactants, include the nucleation and growth of condensed Si via coagulation, condensation, and heterogeneous reaction. Period mechanisms for the SiCl/sub 4//Na and SiF/sub 4//Na reaction systems were examined. Reaction schemes which include 25 elementary reactions were formulated for each system and run to test the sensitivity of the computed concentration and temperature profiles to the values given estimated rate coefficients. It was found that, for SiCl/sub 4//Na, the rate of production of free Si is largely mixing-limited for reasonable rate coefficient estimates. For the SiF/sub 4//Na system the results indicate that the endothermicities of many of the reactions involved in producing Si from SiF/sub 4//Na cause this system to be chemistry-limited …
Date:
November 1, 1978
Creator:
Gould, R. K.
Object Type:
Report
System:
The UNT Digital Library
Use of precalciners to remove alkali from raw material in the cement industry. Quarterly technical progress report, August-October 1978
A literature survey assisted in defining the role of CaCl/sub 2/ and limitations on its applicability to alkali reduction experimentation. Additional insight into the mechanism and parameters of heat exchange in the precalciner-type kiln systems has been gained from the literature search, which culminated in the preparation of the bibliography covering thermal treatment of raw materials. Experiments investigating the efficiency of alkali volatization from pure argillaceous minerals are underway. Initial results have been encouraging, as significant fractions of total alkali were volatilized even under the static conditions employed. Clay minerals were, rather surprisingly, more resistant to alkali removal than feldspars when CaCl/sub 2/ was used. This may indicate that their structure collapsed upon removal of some alkali, and that CaCO/sub 3/ should be added to the clay burns.
Date:
November 1, 1978
Creator:
Miller, F.M.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of H/sub 2/S control technology for geothermal energy sources
This study was conducted to identify processes that are most applicable for control of H/sub 2/S from geothermal sources. Both vapor-dominated and liquid-dominated sources were considered within the electric power generation category. The source characteristics, H/sub 2/S control requirements, and applicable technologies are discussed for the two geothermal sources. An evaluation of the applicable control technology indicates that there are three major approaches for H/sub 2/S removal. These are (a) upstream cleaning (ahead of the power plant), (b) removal of H/sub 2/S from condenser vent emissions, and (c) H/sub 2/S removal from cooling water, including condensate. The most promising processes for these emission points, based on current information, are as follows: the EIC process for upstream cleaning of liquid-dominated sources. For condenser vent emissions, the Stretford process appears to be most applicable; for cooling tower emissions, the iron catalyst process, followed by the H/sub 2/O/sub 2/ process, seems most appropriate.
Date:
November 21, 1978
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Phase 2 of the array automated assembly task for the low cost solar array project. First annual report, October 1, 1977-October 30, 1978
A process sequence has been proposed and tested for the fabrication of dendritic web silicon into solar modules. This sequence has been analyzed as to yield and cost and these data suggest that the price goals of 1986 are attainable. A number of the processes that make up this sequence have been further developed and studied as to cost reduction. Specifically, it has been shown that a low cost POCl/sub 3/ is a suitable replacement for the semiconductor grade, and that a suitable CVD oxide (either doped or undoped) can be deposited from a silane/air mixture using a Silox reactor. A dip coating method has been developed for depositing an antireflection coating from a metal-organic precursor. Application of photoresist to define contact grids has been made cost effective through use of a dip coating technique. Electroplating of both Ag and Cu has been shown feasible and cost effective for producing the conductive metal grids on the solar cells. Laser scribing has been used to separate the cells from the dendrites without degradation. Ultrasonic welding methods have been shown to be feasible for interconnecting the cells. A study of suitable low cost materials for encapsulation suggest that soda lime glass and …
Date:
November 16, 1978
Creator:
Campbell, R. B.
Object Type:
Report
System:
The UNT Digital Library