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Optical voltage reference

Description: An optical voltage reference for providing an alternative to a battery source. The optical reference apparatus provides a temperature stable, high precision, isolated voltage reference through the use of optical isolation techniques to eliminate current and impedance coupling errors. Pulse rate frequency modulation is employed to eliminate errors in the optical transmission link while phase-lock feedback is employed to stabilize the frequency to voltage transfer function.
Date: December 31, 1992
Creator: Rankin, R. & Kotter, D.
Partner: UNT Libraries Government Documents Department
open access

Inclined monochromator for high heat-load synchrotron x-ray radiation

Description: A double crystal monochromator including two identical, parallel crystals, each of which is cut such that the normal to the diffraction planes of interest makes an angle less than 90 degrees with the surface normal. Diffraction is symmetric, regardless of whether the crystals are symmetrically or asymmetrically cut, enabling operation of the monochromator with a fixed plane of diffraction. As a result of the inclination of the crystal surface, an incident beam has a footprint area which is elon… more
Date: December 31, 1992
Creator: Khounsary, A. M.
Partner: UNT Libraries Government Documents Department
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Method and Apparatus for Dissipating Remanent Fields and Preserving Diamagnetism of Ceramic Superconductors

Description: A method for dissipating a remanent field, created when a magnetic field is brought into contact with a superconductor, comprising the steps of (1) providing a ceramic superconductor; (2) continuously or intermittently applying an AC current to the ceramic superconductor; (3) gradually removing the AC current until the undesired remanent field is dissipated.
Date: December 31, 1991
Creator: Youngdahl, C. Arthur
Partner: UNT Libraries Government Documents Department
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Integrated optical tamper sensor

Description: This invention consists of an monolithic optical tamper sensor, comprising an optical emitter and detector, connected by an optical waveguide and placed into the critical entry plane of an enclosed sensitive region, the tamper sensor having a myriad of scraps of a material optically absorbent at the wavelength of interest, such that when the absorbent material is in place on the waveguide, an unique optical signature can be recorded, but when entry is attempted into the enclosed sensitive regio… more
Date: December 31, 1991
Creator: Carson, R. F. & Casalnuovo, S. A.
Partner: UNT Libraries Government Documents Department
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Apparatus for generating a robotic plan for automatically assembling a mechanical component

Description: This invention is comprised of an apparatus operable in combination with a robot positioned in a workcell having a preselected specification is operable to generate a program for operating the robot to assemble a mechanical component. The apparatus includes a planner for receiving as inputs a CAD model of the mechanical component to be assembled, a set of robot primitives and a set of mechanical component assembly rules for determining the conditions under which the set of robot primitives appl… more
Date: December 31, 1991
Creator: Maciejewski, A. A. & Strip, D. R.
Partner: UNT Libraries Government Documents Department
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Combined transuranic-strontium extraction process

Description: The transuranic (TRU) elements neptunium, plutonium and amercium can be separated together with strontium from nitric acid waste solutions in a single process. An extractant solution of a crown ether and an alkyl(phenyl)-N.N-dialkylcarbanylmethylphosphine oxide in an appropriate diluent will extract the TRU`s to gather with strontium, uranium and technetium. The TRU`s and the strontium can then be selectively stripped from the extractant for disposal.
Date: December 31, 1991
Creator: Horwitz, E. P. & Dietz, M. L.
Partner: UNT Libraries Government Documents Department
open access

Mode trap

Description: This report discusses a mode trap to trap and absorb transverse modes formed by a beam in a linear accelerator includes a waveguide having a multiplicity of electrically conductive (preferably copper) irises and rings, each iris and ring including an aperture, and the irises and rings being stacked in a side-by-side, alternating fashion such that the apertures of the irises and rings are concentrically aligned. An absorbing material layer such as a dielectric is embedded in each iris and ring, … more
Date: December 31, 1992
Creator: Chojnacki, E. P.
Partner: UNT Libraries Government Documents Department
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Electronic test circuitry

Description: Circuitry for testing the ability of an intermediate range nuclear instrument to detect and measure a constant current and a periodic current pulse. The invention simulates the resistance and capacitance of the signal connection of a nuclear instrument ion chamber detector and interconnecting cable. An LED flasher/oscillator illuminates an LED at a periodic rate established by a timing capacitor and circuitry internal to the flasher/oscillator. When the LED is on, a periodic current pulse is ap… more
Date: December 31, 1992
Creator: Brown, R. A.
Partner: UNT Libraries Government Documents Department
open access

Fiber optic monitoring device

Description: This invention is comprised of a device for the purpose of monitoring light transmissions in optical fibers comprises a fiber optic tap that optically diverts a fraction of a transmitted optical signal without disrupting the integrity of the signal. The diverted signal is carried, preferably by the fiber optic tap, to a lens or lens system that disperses the light over a solid angle that facilitates viewing. The dispersed light indicates whether or not the monitored optical fiber or system of o… more
Date: December 31, 1992
Creator: Samborsky, J. K.
Partner: UNT Libraries Government Documents Department
open access

Solid-state NMR imaging system

Description: An accessory for use with a solid-state NMR spectrometer includes a special imaging probe with linear, high-field strength gradient fields and high-power broadband RF coils using a back projection method for data acquisition and image reconstruction, and a real-time pulse programmer adaptable for use by a conventional computer for complex high speed pulse sequences.
Date: December 31, 1990
Creator: Gopalsami, N.; Dieckman, S. L. & Ellingson, W. A.
Partner: UNT Libraries Government Documents Department
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Selective epitaxy using the GILD process

Description: The present invention comprises a method of selective epitaxy on a semiconductor substrate. The present invention provides a method of selectively forming high quality, thin GeSi layers in a silicon circuit, and a method for fabricating smaller semiconductor chips with a greater yield (more error free chips) at a lower cost. The method comprises forming an upper layer over a substrate, and depositing a reflectivity mask which is then removed over selected sections. Using a laser to melt the unm… more
Date: December 31, 1990
Creator: Weiner, K. H.
Partner: UNT Libraries Government Documents Department
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Catalyzed enzyme electrodes

Description: An enzyme electrode is prepared with a composite coating on an electrical conductor. The composite coating is formed from a casting solution of a perfluorosulfonic acid, polymer, an enzyme, and a carbon supported catalyst. The solution may be cast directly on the conductor surface or may be formed as a membrane and applied to the surface. The perfluorosulfonic acid ionomer formed from the casting solution provides an insoluble biocompatible protective matrix for the enzyme and acts to retain th… more
Date: December 31, 1992
Creator: Zawodzinski, T. A.; Wilson, M. S.; Rishpon, J. & Gottesfeld, S.
Partner: UNT Libraries Government Documents Department
open access

Grate assembly for fixed-bed coal gasifier

Description: A grate assembly for a coal gasifier of a moving-bed or fixed-bed type is provided for crushing agglomerates of solid material such as clinkers, tailoring the radial distribution of reactant gases entering the gasification reaction zone, and control of the radial distribution of downwardly moving solid velocities in the gasification and combustion zone. The clinker crushing is provided by pinching clinkers between vertically oriented stationary bars and angled bars supported on the upper surfac… more
Date: December 31, 1992
Creator: Notestein, J. E.
Partner: UNT Libraries Government Documents Department
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Sample Holder for X-Ray Diffractometry

Description: A sample holder for use with x-ray diffractometers with the capability to rotate the sample, as well as to adjust the position of the sample in the x, y, and z directions. Adjustment in the x direction is accomplished through loosening set screws, moving a platform, and retightening the set screws. Motion translators are used for adjustment in the y and z directions. An electric motor rotates the sample, and receives power from the diffractometer.
Date: December 31, 1991
Creator: Hesch, Victor L.
Partner: UNT Libraries Government Documents Department
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High density hexagonal boron nitride prepared by hot isostatic pressing in refractory metal containers

Description: Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a cansister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800{degrees}… more
Date: December 31, 1990
Creator: Hoenig, C. L.
Partner: UNT Libraries Government Documents Department
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Ice electrode electrolytic cell

Description: This invention relates to a method and apparatus for removing heavy metals from waste water, soils, or process streams by electrolytic cell means. The method includes cooling a cell cathode to form an ice layer over the cathode and then applying an electric current to deposit a layer of the heavy metal over the ice. The metal is then easily removed after melting the ice. In a second embodiment, the same ice-covered electrode can be employed to form powdered metals.
Date: December 31, 1992
Creator: Glenn, D. F.; Suciu, D. F.; Harris, T. L. & Ingram, J. C.
Partner: UNT Libraries Government Documents Department
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An ion source based on the cathodic arc

Description: This invention is comprised of a cylindrically symmetric arc source to produce a ring of ions which leave the surface of the arc target radially and are reflected by electrostatic fields present in the source to a point of use, such as a part to be coated. An array of electrically isolated rings positioned in the source serves the duel purpose of minimizing bouncing of macroparticles and providing electrical insulation to maximize the electric field gradients within the source. The source also … more
Date: December 31, 1992
Creator: Sanders, D. M. & Falabella, S.
Partner: UNT Libraries Government Documents Department
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Active imaging system with Faraday filter

Description: This invention is comprised of an active imaging system which has a low to medium powered laser transmitter and a receiver wherein the receiver includes a Faraday filter with an ultranarrow optical bandpass and a bare (nonintensified) CCD camera. The laser is locked in the vicinity of the passband of the Faraday filter. The system has high sensitivity to the laser illumination wile eliminating solar background.
Date: December 31, 1992
Creator: Snyder, J. J.
Partner: UNT Libraries Government Documents Department
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Improved thermal storage module for solar dynamic receivers

Description: This invention relates to a thermal storage apparatus and more particularly to an apparatus for use in conjunction with solar dynamic energy storage systems. The invention is comprised of a thermal energy storage system comprising a germanium phase change material and a graphite container.
Date: December 31, 1990
Creator: Beatty, R. L. & Lauf, R. J.
Partner: UNT Libraries Government Documents Department
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Compact acoustic refrigerator

Description: This invention is comprised of a compact acoustic refrigeration system that actively cools components, e.g., electrical circuits, in a borehole environment. An acoustic engine includes first thermodynamic elements for generating a standing acoustic wave in a selected medium. An acoustic refrigerator includes second thermodynamic elements located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements and a relatively hot temperature … more
Date: December 31, 1991
Creator: Bennett, G. A.
Partner: UNT Libraries Government Documents Department
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Palladium/kieselguhr composition and method

Description: Disclosed is a hydrogen-absorbing composition and method for making such a composition. The composition comprises a metal hydride, preferably palladium, deposited onto a porous substrate such as kieselguhr, for use in hydrogen-absorbing processes. The composition is made by immersing a substrate in a concentrated solution containing palladium, such as tetra-amine palladium nitrate. Palladium from the solution is deposited onto the porous substrate, which is preferably in the form of kieselguhr … more
Date: December 31, 1992
Creator: Mosley, W. C. Jr.
Partner: UNT Libraries Government Documents Department
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Sensor/source electrometer circuit

Description: A multiple decade electrometer circuit is claimed which can measure low input currents or act as a current source and is comprised of a microprocessor controlled digital to analog converters to derive individual decades. A plurality of decades are created by multiple D-A voltage sources which generate electrometer currents through scaled resistors. After a first series of decades of current are successively produced, the converters are 10 cycled to generate current through new resistors scaled … more
Date: December 31, 1991
Creator: Hughes, W. J.
Partner: UNT Libraries Government Documents Department
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Explosive laser light initiation of propellants

Description: This invention is comprised of an improved initiator for artillery shell using an explosively generated laser light to uniformly initiate the propellent. A small quantity of a high explosive, when detonated, creates a high pressure and temperature, causing the surrounding noble gas to fluoresce. This fluorescence is directed into a lasing material, which lases, and directs laser light into a cavity in the propellant, uniformly initiating the propellant.
Date: December 31, 1992
Creator: Piltch, M. S.
Partner: UNT Libraries Government Documents Department
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Selectable fragmentation warhead

Description: This report discusses a selectable fragmentation warhead which is capable of producing a predetermined number of fragments from a metal plate, and accelerating the fragments toward a target. A first explosive located adjacent to the plate is detonated at selected number of points by laser-driven slapper detonators. In one embodiment, a smoother-disk and a second explosive, located adjacent to the first explosive, serve to increase acceleration of the fragments toward a target. The ability to pr… more
Date: December 31, 1992
Creator: Bryan, C. S.; Paisley, D. L.; Montoya, N. I. & Stahl, D. B.
Partner: UNT Libraries Government Documents Department
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