UNT Libraries Government Documents Department - 888 Matching Results

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open access

/sup 18/F-4-fluoroantipyrine

Description: The novel radioactive compound /sup 18/F-4-fluoroantipyrine having high specific activity which can be used in nuclear medicine in diagnostic applications, prepared by the direct fluorination of antipyrine in acetic acid with radioactive fluorine at room temperature and purifying said radioactive compound by means of gel chromatography with ethyl acetate as eluent is disclosed. The non-radioactive 4-fluoroantipyrine can also be prepared by the direct fluorination of antipyrine in acetic acid wi… more
Date: January 1, 1980
Creator: Shiue, Chyng-Ysnn & Wolf, Alfred P.
open access

Method of preparing high-temperature-stable thin-film resistors

Description: A chemical vapor deposition method for manufacturing tungsten-silicide thin-film resistors of predetermined bulk resistivity and temperature coefficient of resistance (TCR) is disclosed. Gaseous compounds of tungsten and silicon are decomposed on a hot substrate to deposit a thin-film of tungsten-silicide. The TCR of the film is determined by the crystallinity of the grain structure, which is controlled by the temperature of deposition and the tungsten to silicon ratio. The bulk resistivity is … more
Date: November 12, 1980
Creator: Raymond, L. S.
open access

Moment-free toroidal magnet background of the invention

Description: A toroidal magnet is described for confining a high magnetic field for use in fusion reactor research and nuclear particle detection. The magnet includes a series of conductor elements arranged about and fixed at its small major radius portion to the outer surface of a central cylindrical support each conductor element having a geometry such as to maintain the conductor elements in pure tension when a high current flows therein, and a support assembly which redistributes all or part of the tens… more
Date: March 2, 1981
open access

Electrochemical cell having cyclindircal electrode elements

Description: A secondary, high temperature electrochemical cell especially adapted for lithium alloy negative electrodes, transition metal chalcogenide positive electrodes and alkali metal halide or alkaline earth metal halide electrolyte is disclosed. The cell is held within an elongated cylindrical container in which one of the active materials is filled around the outside surfaces of a pluraity of perforate tubular current collectors along the length of the container. Each of the current collector tubes … more
Date: March 5, 1981
Creator: Nelson, P.A. & Shimotake, H.
open access

Nuclear reactor fuel-assembly duct-tube-to-handling-socket attachment system. [LMFBR]

Description: A reusable system is described for removably attaching the upper end of a nuclear reactor duct tube to the lower end of a nuclear reactor fuel assembly handling socket. A transition ring, fixed to the duct tube's upper end, has an interior-threaded section with a first locking hole segment. An adaptor ring, fixed to the handling socket's lower end has an outside-threaded section with a second locking hole segment. The inside and outside threaded sections match and can be joined so that the firs… more
Date: March 5, 1981
open access

Groove refinishing tool

Description: A groove refinishing tool is disclosed which utilizes a finishing wheel which is controlled by an air grinder motor. The air grinder motor is mounted on a main body section which is pivotally attached to a shoe element. The shoe element contains guide pins which guide the shoe element on the groove to be refinished. Application of pressure on the main body element compresses a weight counterbalance spring to extend the finishing wheel through the shoe element to refinish the groove surface. A w… more
Date: March 11, 1981
Creator: Kellogg, H.J.
open access

Method of forming metallic coatings on polymeric substrates and of forming graded polymeric coatings or films

Description: The invention described herein relates to methods of forming graded polymeric coatings or films on a desired substrate and of forming metallic coatings on polymeric or other nonmetallic substrates. In particular, it relates to methods of forming such coatings or films by sorption and/or diffusion of metals into coatings or films of polymeric material deposited by conventional techniques on a desired substrate.
Date: March 11, 1981
Creator: Liepins, R.
open access

Combination ring cavity and backward Raman waveguide amplifier

Description: A combination regenerative ring and backward Raman waveguide amplifier and a combination regenerative ring oscillator and backward Raman waveguide amplifier which produce Raman amplification, pulse compression, and efficient energy extraction from the CO/sub 2/ laser pump signal for conversion into a Stokes radiation signal. The ring cavity configuration allows the CO/sub 2/ laser pump signal and Stokes signal to copropagate through the Raman waveguide amplifier. The backward Raman waveguide am… more
Date: March 13, 1981
Creator: Kurnit, N.A.
open access

Receiver for solar-energy collector having improved aperture aspect

Description: A secondary concentrator for use in receiver systems for linear focusing primary concentrators is provided with reflector wings at each end. The wings increase the capture of light rays reflected from areas adjacent the rim of a primary concentrator, increasing the apparent aperture size of the receiver as viewed from the rim of the primary concentrator. The length, tilt, and curvature of the wing reflectors can be adjusted to provide a receiver having a desired aperture aspect.
Date: March 13, 1981
Creator: McIntire, W.R.
open access

Seal assembly

Description: A seal assembly comprises a tube rotatable about its longitudinal axis and having two longitudinally spaced flanges projecting radially outwardly from the outer surface thereof. Slidably positioned against one of the flanges is a seal ring, and disposed between this seal ring and the other flange are two rings that are forced apart by springs, one of the latter rings being attached to a flexible wall.
Date: March 13, 1981
Creator: Morgan, J. G.; Rennich, M. J. & Whatley, M. E.
open access

Steering system for a train of rail-less vehicles

Description: A steering system for use with a multiple vehicle train is disclosed which permits tracking without rails of one vehicle after another. This system is particularly useful for moving conveyor systems into and out of curved paths of room and pillar underground mine installations. The steering system features an elongated steering bar pivotally connected to each of adjacent vehicles at end portions of the bar permitting angular orientation of each vehicle in respect to the steering bar and other v… more
Date: March 13, 1981
Creator: Voight, Edward Theodore
open access

System for utilizing shale oil fines. [Patent application]

Description: A system is provided for utilizing fines of carbonaceous materials such as particles or pieces of oil shale of about one-half inch or less diameter which are rejected for use in some conventional or prior surface retorting process, which obtains maximum utilization of the energy content of the fines and which produces a waste which is relatively inert and of a size to facilitate disposal. The system includes a cyclone retort which pyrolyzes the fines in the presence of heated gaseous combustion… more
Date: March 13, 1981
Creator: Harak, A. E.
open access

Coal gasification vessel. [Patent application]

Description: A vessel system comprises an outer shell of carbon fibers held in a binder, a coolant circulation mechanism and control mechanism and an inner shell comprised of a refractory material and is of light weight and capable of withstanding the extreme temperature and pressure environment of, for example, a coal gasification process. The control mechanism can be computer controlled and can be used to monitor and modulate the coolant which is provided through the circulation mechanism for cooling and … more
Date: March 17, 1981
Creator: Loo, Billy W.
open access

Continuous chain bit with downhole cycling capability

Description: A continuous chain bit for hard rock drilling is disclosed which is capable of downhole cycling. A drill head assembly moves axially relative to a support body while the chain on the head assembly is held in position so that the bodily movement of the chain cycles the chain to present new composite links for drilling. A pair of spring fingers on opposite sides of the chain hold the chain against movement. The chain is held in tension by a spring-biased tensioning bar. A head at the working end … more
Date: March 17, 1981
Creator: Ritter, D. F.; St. Clair, J. A. & Togami, H. K.
open access

Method and apparatus for the formation of a spheromak plasma

Description: An inductive method and apparatus for forming detached spheromak plasma using a thin-walled metal toroidal ring are described that uses external current leads and internal poloidal and toroidal field coils located inside a vacuum chamber filled with low density hydrogen gas and an external axial field generating coil. The presence of a current in the poloidal field coils, and an externally generated axial field sets up the initial poloidal field configuration in which the field is strongest tow… more
Date: March 24, 1981
Creator: Jardin, S. C.; Yamada, M.; Furth, H. P. & Okabayashi, M.
open access

Transistorized power switch and base drive circuit therefore

Description: A high power switching circuit is disclosed which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn-off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In … more
Date: March 24, 1981
Creator: Lee, F.C. & Carter, R.A.
open access

Hydrodesulfurization and hydrodenitrogenation catalysts obtained from coal mineral matter. [Patent application]

Description: A hydrotreating catalyst is prepared from coal mineral matter obtained by low temperature ashing coals of relatively low bassanite content by the steps of: (a) depositing on the low temperature ash 0.25 to 3 grams of an iron or nickel salt in water per gram of ash and drying a resulting slurry; (b) crushing and sizing a resulting solid; and (c) heating the thus-sized solid powder in hydrogen.
Date: March 26, 1981
Creator: Hwai-der Liu, K. & Hamrin, C.E. Jr.
open access

Minimally refined biomass fuel. [carbohydrate-water-alcohol mixture]

Description: A minimally refined fluid composition, suitable as a fuel mixture and derived from biomass material, is comprised of one or more water-soluble carbohydrates such as sucrose, one or more alcohols having less than four carbons, and water. The carbohydrate provides the fuel source; water-solubilizes the carbohydrate; and the alcohol aids in the combustion of the carbohydrate and reduces the viscosity of the carbohydrate/water solution. Because less energy is required to obtain the carbohydrate fro… more
Date: March 26, 1981
Creator: Pearson, R. K. & Hirschfeld, T. B.
open access

Cermets and method for making same

Description: The present invention is directed to a method for making a wide variety of general-purpose cermets and for radioactive waste disposal from ceramic powders prepared from urea-dispersed solutions containing various metal values. The powders are formed into a compact and subjected to a rapid temperature increase in a reducing atmosphere. During this reduction, one or more of the more readily reducible oxides in the compact is reduced to a selected substoichiometric state at a temperature below the… more
Date: April 1, 1981
Creator: Aaron, W. S.; Kinser, D. L. & Quinby, T. C.
open access

Method and apparatus for recovering unstable cores

Description: A method and apparatus suitable for stabilizing hydrocarbon cores are given. Such stabilized cores have not previously been obtainable for laboratory study, and such study is believed to be required before the hydrate reserves can become a utilizable resource. The apparatus can be built using commercially available parts and is very simple and safe to operate.
Date: April 1, 1981
Creator: McGuire, P. L. & Barraclough, B. L.
open access

Dust-Feed Mechanism

Description: The invention is a dust feed device for delivery of a uniform supply of dust for long periods of time to an aerosolizing means for production of a dust suspension. The device utilizes at least two tandem containers having spiral brushes within the containers which transport the dust from a supply to the aerosolizer means.
Date: April 6, 1981
Creator: Milliman, Edward M.
open access

In-situ vitrification of soil. [Patent application]

Description: A method of vitrifying soil at or below a soil surface location. Two or more conductive electrodes are inserted into the soil for heating of the soil mass between them to a temperature above its melting temperature. Materials in the soil, such as buried waste, can thereby be effectively immobilized.
Date: April 6, 1981
Creator: Brouns, R. A.; Buelt, J. L. & Bonner, W. F.
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