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379 Matching Results
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Glass-heat-pipe evacuated-tube solar collector
A glass heat pipe is adapted for use as a solar energy absorber in an evacuated tube solar collector and for transferring the absorbed solar energy to a working fluid medium or heat sink for storage or practical use. A capillary wick is formed of granular glass particles fused together by heat on the inside surface of the heat pipe with a water glass binder solution to enhance capillary drive distribution of the thermal transfer fluid in the heat pipe throughout the entire inside surface of the evaporator portion of the heat pipe. Selective coatings are used on the heat pipe surface to maximize solar absorption and minimize energy radiation, and the glass wick can alternatively be fabricated with granular particles of black glass or obsidian.
Date:
August 6, 1981
Creator:
McConnell, R.D. & VanSant, J.H.
Object Type:
Patent
System:
The UNT Digital Library
Harmonically excited orbital variations
Rephrasing the equations of motion for orbital maneuvers in terms of Lagrangian generalized coordinates instead of Newtonian rectangular cartesian coordinates can make certain harmonic terms in the orbital angular momentum vector more readily apparent. In this formulation the equations of motion adopt the form of a damped harmonic oscillator when torques are applied to the orbit in a variationally prescribed manner. The frequencies of the oscillator equation are in some ways unexpected but can nonetheless be exploited through resonant forcing functions to achieve large secular variations in the orbital elements. Two cases are discussed using a circular orbit as the control case: (1) large changes in orbital inclination achieved by harmonic excitation rather than one impulsive velocity change, and (2) periodic and secular changes to the longitude of the ascending node using both stable and unstable excitation strategies. The implications of these equations are also discussed for both artificial satellites and natural satellites. For the former, two utilitarian orbits are suggested, each exploiting a form of harmonic excitation. 5 refs.
Date:
August 6, 1985
Creator:
Morgan, T.
Object Type:
Article
System:
The UNT Digital Library
Dynamic response of a thin disk subjected to a thermal pulse
The dynamic response of a thin steel disk to a transient thermal pulse induced by a pulsed neodymium-glass laser was studied experimentally and compared with numerical results from a finite element code. The experiment was designed to provide data for use in code development work for erosion/corrosion studies.
Date:
August 6, 1982
Creator:
Calder, C.A. & Cornell, R.H.
Object Type:
Report
System:
The UNT Digital Library
Coolant monitoring apparatus for nuclear reactors. [PWR; BWR]
A system for monitoring coolant conditions within a pressurized vessel is described. A length of tubing extends outward from the vessel from an open end containing a first line restriction at the location to be monitored. The flowing fluid is cooled and condensed before passing through a second line restriction. Measurement of pressure drop at the second line restriction gives an indication of fluid condition at the first line restriction. Multiple lengths of tubing with open ends at incremental elevations can measure coolant level within the vessel.
Date:
August 6, 1981
Creator:
Tokarz, R.D.
Object Type:
Patent
System:
The UNT Digital Library
[News Clip: Murder / Fire]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date:
August 6, 1989
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Myerson]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.
Date:
August 6, 1989
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Anti Charter]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.
Date:
August 6, 1989
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Houston Agent Orange]
Video footage from the WBAP-TV station in Fort Worth, Texas, to accompany an unknown news story. This b-roll footage shows cars with American flags in the area of the Houston Astrodome. This story aired at 10:00 P.M.
Date:
August 6, 1983
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 79, No. 32, Ed. 1 Thursday, August 6, 1987
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1987
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 73, No. 32, Ed. 1 Thursday, August 6, 1981
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1981
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 97, No. 32, Ed. 1 Thursday, August 6, 1987
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1987
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
X-ray microscopy using grazing-incidence reflection optics
The Kirkpatrick-Baez microscopes are described along with their role as the workhorse of the x-ray imaging devices. This role is being extended with the development of a 22X magnification Kirkpatrick-Baez x-ray microscope with multilayer x-ray mirrors. These mirrors can operate at large angles, high x-ray energies, and have a narrow, well defined x-ray energy bandpass. This will make them useful for numerous experiments. However, where a large solid angle is needed, the Woelter microscope will still be necessary and the technology needed to build them will be useful for many other types of x-ray optics.
Date:
August 6, 1981
Creator:
Price, R.H.
Object Type:
Article
System:
The UNT Digital Library
[Minutes for the TXSSAR Board of Managers Meeting: August 6, 1988]
Minutes from a meeting of the TXSSAR Board of Managers, held on August 6, 1988, in Amarillo, Texas, including a summary of activities and business discussed. The meeting was called to order and presided by President Charles B. Morgan, with twenty-two members and seventeen guests in attendance.
Date:
August 6, 1988
Creator:
Sons of the American Revolution. Texas Society.
Object Type:
Text
System:
The UNT Digital Library
The Bogata News (Bogata, Tex.), Vol. 76, No. 45, Ed. 1 Thursday, August 6, 1987
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
August 6, 1987
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Analytical cytology applied to detection of induced cytogenetic abnormalities
Radiation-induced biological damage results in formation of a broad spectrum of cytogenetic changes such as translocations, dicentrics, ring chromosomes, and acentric fragments. A battery of analytical cytologic techniques are now emerging that promise to significantly improve the precision and ease with which these radiation induced cytogenetic changes can be quantified. This report summarizes techniques to facilitate analysis of the frequency of occurrence of structural and numerical aberrations in control and irradiated human cells. 14 refs., 2 figs.
Date:
August 6, 1987
Creator:
Gray, J.W.; Lucas, J.; Straume, T. & Pinkel, D.
Object Type:
Article
System:
The UNT Digital Library
Microhardness Tests for High-Energy Neutron-Source Experiments
In a development effort to extract mechanical property information from miniature specimens, standard diamond pyramid microhardness (DPH) tests have been conducted at Hanford Engineering Development Laboratory (HEDL) on specimens irradiated in RTNS-II; and techniques to extend the information available from microhardness tests have been developed at the University of California, Santa Barbara (UCSB). In tests at HEDL, radiation hardening has only been observed in relatively pure materials irradiated to neutron fluences less than 4 x 10/sup 17/ n/cm/sup 2/. In copper, specifically, a proportional increase in the DPH with neutron fluence has been observed, and this microhardness increase has been correlated with an increase in the 0.2 percent offset yield strength. At UCSB it has been found that hardness and microhardness data obtained with spherical indenters can be used to determine the true stress-true plastic strain relationship of the test material; moreover, it has been found that features of the indentation lip geometry can be used to characterize localized flow phenomena like Lueders strain in steel. Consequently, microhardness test techniques appear attractive for small specimen test applications.
Date:
August 6, 1981
Creator:
Panayotou, N. F. & Lucas, G. E.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Diffraction Properties and Applications of Layered Synthetic Microstructures in the 1 to 10 Angstrom Region
Layered synthetic microstructures have been built and tested for use as medium-resolution x-ray diffraction monochromators, in the 1 to 10 angstrom wavelength region. They can be employed to good advantage in spectrometry and imaging instruments that are used to determine the nature of the x-ray emission of high-temperature plasmas. When the micro-structures are used in spectrometers, we find that they gather much more light than natural crystals and are not troubled by high order diffraction response, yet have better spectral resolution than that provided by spectrometer channels formed by Ross filter or filter/fluorescer techniques. For use in imaging instruments such as the grazing-incidence reflection Kirkpatrick-Baez microscope, the microstructures provide high reflectivity at wavelengths shorter than the practical limit of total external reflection. We will present calibration data that describes the diffraction properties and piece-to-piece uniformity of microstructures built especially for use in the 1 to 10 angstrom region. We will also describe in detail two instruments that will be used at the Shiva laser system to determine the spectral and spatial distributions of x-rays radiated by inertial confinement fusion targets.
Date:
August 6, 1980
Creator:
Koppel, L. & Barbee, T. W., Jr.
Object Type:
Article
System:
The UNT Digital Library
Progress in Inertial Confinement Fusion at Lawrence Livermore National Laboratory
The goals of the Inertial Fusion Program at the Lawrence Livermore National Laboratory are to study matter under extreme conditions of temperature and pressure and to produce fusion energy from inertially confined fusion fuel. With the conclusion of recent multi-kilojoule 0.53 ..mu..m experiments on Novette, we have demonstrated vastly improved plasma conditions compared to those previously obtained at LLNL with similar energies at 1.06 ..mu..m and elsewhere with 10 ..mu..m radiation. The lower preheat environment obtainable with short wavelength light has led to 3X improvements in the compression of targets on Novette compared to similar targets on Shiva with 1.06 ..mu..m. Subsequent experiments on Nova with short wavelength light will begin in 1985. They are expected to demonstrate the necessary compression conditions required for high gain fusion to occur when irradiated with a multi-megajoule driver. These recent results, together with improved calculations, and innovations in driver and reactor technology, indicate that high gain inertial fusion will occur and is a viable candidate for fusion power production in the future.
Date:
August 6, 1984
Creator:
Holzrichter, John F.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Richardson school tax]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 6, 1984, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Halfway house]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
1981-08-06T24:00:00
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Afternoon papers]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 6, 1981, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Kidnap]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 6, 1980, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Cherokeean. (Rusk, Tex.), Vol. 132, No. 25, Ed. 1 Thursday, August 6, 1981
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1981
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Cherokeean. (Rusk, Tex.), Vol. 139, No. 26, Ed. 1 Thursday, August 6, 1987
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1987
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History