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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
open access

Minefield reconnaissance and detector system

Description: This invention is comprised of a multi-sensor system for detecting the presence of objects on the surface of the ground or buried just under the surface, such as anti-personnel or anti-tank mines or the like, is disclosed. A remote sensor platform has a plurality of metal detector sensors and a plurality of short pulse radar sensors. The remote sensor platform is remotely controlled from a processing and control unit and signals from the remote sensor platform are sent to the processing and con… more
Date: December 31, 1991
Creator: Butler, M. T.; Cave, S. P.; Creager, J. D.; Johnson, C. M.; Mathes, J. B. & Smith, K. J.
Partner: UNT Libraries Government Documents Department
open access

Method and apparatus for transporting liquid slurries

Description: An improved method and device to prevent erosion of slurry transport devices is disclosed which uses liquid injection to prevent contact by the slurry composition with the inner surface of the walls of the transport system. A non-abrasive liquid is injected into the slurry transport system and maintains intimate contact with the entire inner surface of the transport system, thereby creating a fluid barrier between the nonabrasive liquid and the inner surface of the transport system which thereb… more
Date: December 31, 1991
Creator: Berry, G. F.; Lyczkowski, R. W. & Wang, Chi-Sheng
Partner: UNT Libraries Government Documents Department
open access

Non-linear optical crystal vibration sensing device

Description: The report describes a non-linear optical crystal vibration sensing device including a photorefractive crystal and a laser. The laser produces a coherent light beam which is split by a beam splitter into a first laser beam and a second laser beam. After passing through the crystal the first laser beam is counter-propagated back upon itself by a retro-mirror, creating a third laser beam . The laser beams are modulated, due to the mixing effect within the crystal by vibration of the crystal. In t… more
Date: December 31, 1992
Creator: Kalibjian, R.
Partner: UNT Libraries Government Documents Department
open access

Fiber optic inclination detector system

Description: A fiber optic inclination detector system for determining the angular displacement of an object from a reference surface includes a simple mechanical transducer which requires a minimum number of parts and no electrical components. The system employs a single light beam which is split into two light beams and provided to the transducer. Each light beam is amplitude modulated upon reflecting off the transducer to detect inclination. The power values associated with each of the reflected light be… more
Date: December 31, 1994
Creator: Cwalinski, J.P.
Partner: UNT Libraries Government Documents Department
open access

Method for separating constituents from solution employing a recyclable Lewis acid metal-hydroxy gel

Description: This invention permits radionuclides, heavy metals, and organics to be extracted from solution by scavenging them with an amorphous gel. In the preferred embodiment, a contaminated solution (e.g. from soil washing, decontamination, or groundwater pumping) is transferred to a reaction vessel. The contaminated solution is contacted by the sequestering reagent which might contain for example, aluminate and EDTA anions in a 2.5 M NaOH solution. The pH of the reagent bearing solution is lowered on c… more
Date: December 31, 1995
Creator: Alexander, D. H.
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
open access

Apparatus and method for laser deposition of durable coatings

Description: Disclosed are method and apparatus for depositing durable coatings onto the surface of a substrate without heating the entire substrate to high temperatures by using lasers to heat the substrate and dissociate a deposition gas. The apparatus comprises a deposition chamber for enclosing the substrate upon which a coating is to be deposited, gas delivery means for directing a flow of deposition gas on the substrate, a first laser for heating the substrate, and a second laser for irradiating the d… more
Date: December 31, 1993
Creator: Veligdan, J.T.; Vanier, P. & Barletta, R.E.
Partner: UNT Libraries Government Documents Department
open access

Apparatus for preparing a sample for mass spectrometry

Description: Disclosed is an apparatus for preparing a sample for analysis by a mass spectrometer system. The apparatus has an entry chamber and an ionization chamber separated by a skimmer. A capacitor having two space-apart electrodes followed by one or more ion-imaging lenses is disposed in the ionization chamber. The chamber is evacuated and the capacitor is charged. A valve injects a sample gas in the form of sample pulses into the entry chamber. The pulse is collimated by the skimmer and enters the io… more
Date: December 31, 1992
Creator: Villa-Aleman, E.
Partner: UNT Libraries Government Documents Department
open access

Compact self-contained electrical-to-optical converter/transmitter

Description: An electrical-to-optical converter/transmitter is disclosed. A first optical receiver and a second optical receiver are provided for receiving a calibrate command and a power switching signal, respectively, from a remote processor. A third receiver is provided for receiving an analog electrical signal from a transducer. A calibrator generates a reference signal in response to the calibrate command. A combiner mixes the electrical signal with the reference signal to form a calibrated signal. A c… more
Date: December 31, 1992
Creator: Seligmann, D. A.; Moss, W. C.; Valk, T. C. & Conder, A. D.
Partner: UNT Libraries Government Documents Department
open access

Apparatus and method for removing particulate deposits from high temperature filters

Description: The combustion of a fuel-air mixture is used to provide a high-temperature and high-pressure pulse of gaseous combustion products for the back-flush cleaning of ceramic filter elements contained in a barrier filter system and utilized to separate particulates from particulate-laden process gases at high temperature and high pressure. The volume of gaseous combustion products provided by the combustion of the fuel-air mixture is preferably divided into a plurality of streams each passing through… more
Date: December 31, 1992
Creator: Nakaishi, C. V.; Holcombe, N. T. & Micheli, P. L.
Partner: UNT Libraries Government Documents Department
open access

Three Dimensional, Multi-Chip Module

Description: The present invention relates to integrated circuit packaging technology, and particularly to three dimensional packages involving high density stacks of integrated circuits. A plurality of multi-chip modules are stacked and bonded around the perimeter by sold-bump bonds to adjacent modules on, for instance, three sides of the perimeter. The fourth side can be used for coolant distribution, for more interconnect structures, or other features, depending on particular design considerations of the… more
Date: December 31, 1992
Creator: Bernhardt, A. F. & Petersen, R. W.
Partner: UNT Libraries Government Documents Department
open access

Interline Transfer CCD Camera

Description: An interline CCD sensing device for use in a camera system, includes an imaging area sensitive to impinging light, for generating charges corresponding to the intensity of the impinging light. Sixteen independent registers R1 - R16 sequentially receive the interline data from the imaging area, corresponding to the generated charges. Sixteen output amplifiers S1 - S16 and sixteen ports P1 - P16 for sequentially transferring the interline data, one pixel at a time, in order to supply a desired im… more
Date: December 31, 1993
Creator: Prokop, Mark S.; McCurnin, Thomas W.; Stump, Charles J. & Stradling, Gary L.
Partner: UNT Libraries Government Documents Department
open access

Pipe weld crown removal device

Description: This invention is comprised of a device that provides for grinding down the crown of a pipe weld joining aligned pipe sections so that the weld is substantially flush with the pipe sections joined by the weld. The device includes a cage assembly comprising a pair of spaced cage rings adapted to be mounted for rotation on the respective pipe sections on opposite sides of the weld, a plurality of grinding wheels, supported by the cage assembly for grinding down the crown of the weld, and a plural… more
Date: December 31, 1991
Creator: Sword, C.K. & Sette, P.J.
Partner: UNT Libraries Government Documents Department
open access

High resolution data acquisition

Description: A high resolution event interval timing system measures short time intervals such as occur in high energy physics or laser ranging. Timing is provided from a clock pulse train and analog circuitry for generating a triangular wave synchronously with the pulse train. The triangular wave has an amplitude and slope functionally related to the time elapsed during each clock pulse in the train. A converter forms a first digital value of the amplitude and slope of the triangle wave at the start of the… more
Date: December 31, 1992
Creator: Thornton, G. W. & Fuller, K. R.
Partner: UNT Libraries Government Documents Department
open access

Method and apparatus for removing ions from soil

Description: This invention is comprised of a method and apparatus for selectively removing species of ions from an area of soil. Permeable membranes and impregnated with an ion exchange resin that is specific to one or more species of chemical ions are inserted into ground in close proximity to, and on opposing sides of, a soil area of interest. An electric potential is applied across electrodes and to cause the migration of ions out of soil area toward the membranes. Preferably, the resin exchanges ions o… more
Date: December 31, 1992
Creator: Bibler, J. P.
Partner: UNT Libraries Government Documents Department
open access

Improved production of N{sup +} ions from a multicusp ion beam apparatus

Description: This invention is comprised of a method of generating a high purity (at least 98%) N{sup +} ion beam using a multicusp ion source having a chamber formed by a cylindrical chamber wall surrounded by a plurality of magnets, a filament centrally disposed in said chamber, a plasma electrode having an extraction orifice at one end of the chamber, a magnetic filter having two parallel magnets spaced from said plasma electrode and dividing the chamber into arc discharge and extraction regions. The met… more
Date: December 31, 1991
Creator: Leung, Ka-Ngo; Kunkel, W.B. & Walther, S.R.
Partner: UNT Libraries Government Documents Department
open access

Separation of Metals by Supported Liquid Membranes

Description: A supported liquid membrane system for the separation of a preselected chemical species within a feedstream, preferably an aqueous feedstream, includes a feed compartment containing a feed solution having at least one preselected chemical species therein, a stripping compartment containing a stripping solution therein, and a microporous polybenzimidazole membrane situated between the compartments, the microporous polybenzimidazole membrane containing an extractant mixture selective for the pres… more
Date: December 31, 1990
Creator: Takigawa, Doreen Y.
Partner: UNT Libraries Government Documents Department
open access

Reflective Optical Imaging System for Extreme Ultraviolet Wavelengths

Description: This invention is comprised of a projection reflection optical system having two mirrors in a coaxial, four reflection configuration to reproduce the image of an object. The mirrors have aspherical reflection surfaces to provide a very high resolution of object feature wavelengths less than 200 {mu}m, and preferably less than 100 {mu}m. An image resolution of features less than 0.05--0.1 {mu}m, is obtained over a large area field; i.e., 25.4 mm {times} 25.4 mm, with a distortion less than 0.1 o… more
Date: December 31, 1991
Creator: Viswanathan, V. K. & Newnam, B. E.
Partner: UNT Libraries Government Documents Department
open access

High voltage feedthrough bushing

Description: A feedthrough bushing for a high voltage diode provides for using compression sealing for all sealing surfaces. A diode assembly includes a central conductor extending through the bushing and a grading ring assembly circumferentially surrounding and coaxial with the central conductor. A flexible conductive plate extends between and compressively seals against the central conductor and the grading ring assembly, wherein the flexibility of the plate allows inner and outer portions of the plate to… more
Date: December 31, 1991
Creator: Brucker, J.P.
Partner: UNT Libraries Government Documents Department
open access

Phase-sensitive flow cytometer

Description: This report describes phase-sensitive flow cytometer (FCM) which provides additional FCM capability to use the fluorescence lifetime of one or more fluorochromes bound to single cells to provide additional information regarding the cells. The resulting fluorescence emission can be resolved into individual fluorescence signals if two fluorochromes are present or can be converted directly to a decay lifetime from a single fluorochrome. The excitation light for the fluorochromes is modulated to pr… more
Date: December 31, 1992
Creator: Steinkamp, J. A.
Partner: UNT Libraries Government Documents Department
open access

Production of hollow aerogel microspheres

Description: A method is described for making hollow aerogel microspheres of 800--1200{mu} diameter and 100--300{mu} wall thickness by forming hollow alcogel microspheres during the sol/gel process in a catalytic atmosphere and capturing them on a foam surface containing catalyst. Supercritical drying of the formed hollow alcogel microspheres yields hollow aerogel microspheres which are suitable for ICF targets.
Date: December 31, 1990
Creator: Upadhye, Ravindra S. & Henning, Sten A.
Partner: UNT Libraries Government Documents Department
open access

Indirect-Fired Gas Turbine Bottomed With Fuel Cell

Description: An indirect-heated gas turbine cycle is bottomed with a fuel cell cycle with the heated air discharged from the gas turbine being directly utilized at the cathode of the fuel cell for the electricity-producing electrochemical reaction occurring within the fuel cell. The hot cathode recycle gases provide a substantial portion of the heat required for the indirect heating of the compressed air used in the gas turbine cycle. A separate combustor provides the balance of the heat needed for the indi… more
Date: December 31, 1993
Creator: Micheli, Paul L.; Williams, Mark C. & Parsons, Edward L.
Partner: UNT Libraries Government Documents Department
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