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15,492 Matching Results
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Crossed Sightline ECE Diagnostics
It was shown that crossed-sightline ECE (electron-cyclotron-emission) can be used for both local measurement of fluctuating quantities (electron temperature and density), and also for inferring the local value of the absolute magnetic field in present experiments, or in a reactor environment. The absolute magnetic field measurement is a direct measure of the local plasma pressure ([beta]) in currentless devices, and in combination with temperature and pressure measurements is a measurement of the plasma current density in devices with significant plasma current. Calculations show that absolute measurements of magnetic field can be made to the order of 0.1%, even in a reactor environment, and that a scanning ECE system could be used to measure the beta profile or current profile in a reactor, as appropriate. The electron temperature fluctuation measurements have a similar resolution, and can also show the phase between density and temperature fluctuations, an extremely important quantity for understanding transport caused by these fluctuations.
Date:
September 8, 1990
Creator:
Thomas, C. E., Jr.
Object Type:
Report
System:
The UNT Digital Library
Crossed Sightline ECE Diagnostics. Final Technical Report
It was shown that crossed-sightline ECE (electron-cyclotron-emission) can be used for both local measurement of fluctuating quantities (electron temperature and density), and also for inferring the local value of the absolute magnetic field in present experiments, or in a reactor environment. The absolute magnetic field measurement is a direct measure of the local plasma pressure ({beta}) in currentless devices, and in combination with temperature and pressure measurements is a measurement of the plasma current density in devices with significant plasma current. Calculations show that absolute measurements of magnetic field can be made to the order of 0.1%, even in a reactor environment, and that a scanning ECE system could be used to measure the beta profile or current profile in a reactor, as appropriate. The electron temperature fluctuation measurements have a similar resolution, and can also show the phase between density and temperature fluctuations, an extremely important quantity for understanding transport caused by these fluctuations.
Date:
September 8, 1990
Creator:
Thomas, C. E., Jr.
Object Type:
Report
System:
The UNT Digital Library
Molecular and cellular markers of toxicity in the Japanese Medaka @
The Japanese Medaka (Oryzias latipes) has been recommended for use as a model organism to detect carcinogenic, teratogenic, cytotoxic, and genotoxic compounds in aquatic systems. Because a long latent period often occurs between initial contact with deleterious chemicals and subsequent expression of the pathology, we are investigating early biologically-relevant responses that can be used as genotoxicity markers of exposure and effect. This project focuses on the development of genotoxic bioassays and experimental protocols for exposing Japanese Medaka to genotoxic compounds. 21 refs., 8 figs, 2 tabs.
Date:
January 1, 1990
Creator:
Shugart, L. R.; McCarthy, J. F.; D'Surney, S. J.; Greeley, M. S., Jr. & Hull, C. G.
Object Type:
Article
System:
The UNT Digital Library
Studies of the formation, chemical reactivity, and properties of small clusters: Application to an understanding of aerosol formation and heterogeneous chemistry
The small cluster program involves (1) studies of reactions related to formation and growth of heteromolecular clusters and their thermochemical properties, (2) studies of photoinitiated processes in clusters, (3) investigations related to heterogeneous reactions including the influence of reaction centers on the interconversion, and (4) theoretical calculations of properties, dynamics, and structure. A major thrust of the work during the past year has been devoted to a study of the role of ionization and the presence of ions on reactions and energetics. During the past few months, particular attention has been paid to systems having varying proton affinities. From the data, we can determine the influence of these values on the nature of the reactions and ascertain the ultimate chemical nature of the ionization center formed as a result of the reactions. 83 refs., 12 figs., 2 tabs.
Date:
January 1, 1990
Creator:
Castleman, A. W., Jr.
Object Type:
Report
System:
The UNT Digital Library
Application of parallel computing to the Monte Carlo simulation of electron scattering in solids: A rapid method for profile deconvolution
X-ray microanalysis by analytical electron microscopy (AEM) has proven to be a powerful tool for characterizing the spatial distribution of solute elements in materials. True compositional variations over spatial scales smaller than the actual resolution for microanalysis can be determined if the measured composition profile is deconvoluted. Explicit deconvolutions of such data, via conventional techniques such as Fourier transforms, are not possible due to statistical noise in AEM microanalytical data. Hence, the method of choice is to accomplish the deconvolution via iterative convolutions. In this method, a function describing the assumed true composition profile, calculated by physically permissible thermodynamic and kinetic modeling, is convoluted with the x-ray generation function and the result compared to the measured composition profile. If the measured and calculated profiles agree within experimental error, it is assumed that the true compositional profile has been determined. If the measured and calculated composition profiles are in disagreement, the assumptions in the physical model are adjusted and the convolution process repeated. To employ this procedure it is necessary to calculate the x-ray generation function explicitly. While a variety of procedures are available for calculating this function, the most accurate procedure is to use Monte Carlo modeling of electron scattering.
Date:
January 1, 1990
Creator:
Romig, A. D., Jr.; Plimpton, S. J.; Michael, J. R.; Myklebust, R. L. & Newbury, D. E.
Object Type:
Article
System:
The UNT Digital Library
Viscous flux motion in anisotropic type-II superconductors in low fields
The Bardeen-Stephen model of viscous flux motion in isotropic Type-II superconductors is extended to the anisotropic case characterized by a phenomenological effective mass tensor m{sub ij}. When the magnetic field is low and the vortex lines are aligned along one of the three principal axes, simple expressions for the viscosity tensor {eta}{sub ij} of the viscous flux motion are obtained as functions of m{sub ij} and the normal state conductivity tensor {sigma}{sub ij} for temperature T close to the critical temperature {Tc}. For the high-temperature oxide superconductors the theory predicts that {eta}{sub b}{sup (a)}:{eta}{sub b}{sup (c)}:{eta}{sub c}{sup (a)} {approx} 1:4{gamma}:3{gamma}{sup 2}, where {eta}{sub i}{sup (j)} is the viscosity for the motion along the i-axis of a vortex parallel to the j-axis and {gamma} = {radical}m{sub c}/m{sub a} is the anisotropy parameter (m{sub i}, i = a,b,c, are the principal values of the mass tensor satisfying m{sub a} {approx} m{sub b} {much lt} m{sub c}). 9 refs., 1 fig.
Date:
January 1, 1990
Creator:
Hao, Zhidong & Clem, J. R.
Object Type:
Article
System:
The UNT Digital Library
Star of the Republic Museum Annual Report: 1990
Annual report of the Star of the Republic Museum describing goals, activities, and accomplishments during fiscal year 1989-1990.
Date:
1990
Creator:
Star of the Republic Museum (Washington, Tex.)
Object Type:
Report
System:
The Portal to Texas History
Region, Volume 17, Number 1, January/February 1990
Monthly newsletter of the Alamo Area Council of Governments describing news and events of relevance to the agencies.
Date:
January 1990
Creator:
Alamo Area Council of Governments
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
PUC Bulletin, Volume 15, Number 8, April 1990
Monthly bulletin documenting changes in legislation, judicial rulings, and other regulatory updates related to telephone, electric, and other utility services in Texas.
Date:
April 1990
Creator:
Texas. Public Utility Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
PUC Bulletin, Volume 15, Number 12, August 1990
Monthly bulletin documenting changes in legislation, judicial rulings, and other regulatory updates related to telephone, electric, and other utility services in Texas.
Date:
August 1990
Creator:
Texas. Public Utility Commission.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Revista Rad Waste, Diciembre 1990
Newsletter describing the work the Texas Low-Level Radioactive Waste Disposal Authority and other topics related to radioactive waste for the public.
Date:
December 1990
Creator:
Texas Low-Level Radioactive Waste Disposal Authority
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Star of the Republic Museum Notes, Volume 14, Number 3, Spring 1990
Quarterly newsletter of the Star of the Republic Museum, providing historic information and updates related to events, news, and exhibits at the museum.
Date:
Spring 1990
Creator:
Star of the Republic Museum (Washington, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Revista Rad Waste, Marzo 1990
Newsletter describing the work the Texas Low-Level Radioactive Waste Disposal Authority and other topics related to radioactive waste for the public.
Date:
March 1990
Creator:
Texas Low-Level Radioactive Waste Disposal Authority
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Beef Cattle Research in Texas: 1989
Consolidated progress report providing a summary of research conducted at the experiment station during the prior year related to beef cattle, including: reproduction, meats, and care.
Date:
March 1990
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History
Target Talk, Number 91, Spring 1989
Newsletter of the Texas Hunter Education Program discussing various events, news, and other information related to the program or of interest to hunters in Texas.
Date:
June 1990
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Target Talk, Number 92, Winter 1989
Newsletter of the Texas Hunter Education Program discussing various events, news, and other information related to the program or of interest to hunters in Texas.
Date:
December 1990
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Sheep and Goat, Wool and Mohair: 1990
Consolidated progress report providing a summary of research conducted at the experiment station during the prior year related to raising and breeding sheep and goats, including: reproductive efficiency, sheep and goat health, efficiency of forage and feed utilization, wool and mohair production, quality, and value, and finally production, evaluation, and marketing of lamb meat.
Date:
September 1990
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History
Texas EMS Messenger, Volume 11, Number 2, February 1990
Magazine containing news and information that pertains to Emergency Medical Service (EMS) providers.
Date:
February 1990
Creator:
Texas. Department of Health. Bureau of Emergency Management.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas EMS Messenger, Volume 11, Number 6, July 1990
Magazine containing news and information that pertains to Emergency Medical Service (EMS) providers.
Date:
July 1990
Creator:
Texas. Department of Health. Bureau of Emergency Management.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Department of Mental Health and Mental Retardation Directory of Services: 1990
Directory of institutions coordinated by the Texas Department of Mental Health and Mental Retardation including mental hospitals, state schools, development centers, and youth centers, along with information about accessing services.
Date:
January 1990
Creator:
Texas. Department of Mental Health and Mental Retardation.
Object Type:
Book
System:
The Portal to Texas History
Corn Performance Tests in Texas: 1989
Annual report documenting methods and results of statewide tests on corn varieties and hybrids. It also provides information about corn crops grown in Texas during the previous years.
Date:
1990
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History
Corn Performance Tests in Texas: 1990
Annual report documenting methods and results of statewide tests on corn varieties and hybrids. It also provides information about corn crops grown in Texas during the previous years.
Date:
1990
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History
Grain Sorghum Performance Tests in Texas: 1989
Annual report documenting methods and results of statewide tests on grain sorghum varieties and hybrids. It also provides information about sorghum crops grown in Texas during the previous years.
Date:
1990
Creator:
Pietsch, Dennis; Gaas, Randy; Rosenow, Darrell T.; Miller, Fred & Peterson, Gary C.
Object Type:
Report
System:
The Portal to Texas History
Cotton Cultivar Tests for 1989 in Central and South Texas
Annual report documenting results of a statewide cotton cultivar tests in all cotton-growing regions to determine the relative performance of available cotton varieties.
Date:
1990
Creator:
Texas Agricultural Experiment Station
Object Type:
Report
System:
The Portal to Texas History