965 Matching Results

Search Results

prev Results: 431 - 454 next
open access

Volatile organic compound sensing devices

Description: Apparatus employing vapochromic materials in the form of inorganic double complex salts which change color reversibly when exposed to volatile organic compound (VOC) vapors is adapted for VOC vapor detection, VOC aqueous matrix detection, and selective VOC vapor detection. The basic VOC vapochromic sensor is incorporated in various devices such as a ground probe sensor, a wristband sensor, a periodic sampling monitor, a soil/water penetrometer, an evaporative purge sensor, and various vacuum-ba… more
Date: December 31, 1993
Creator: Lancaster, G.D.; Moore, G.A.; Stone, M.L. & Regen, W.K.
Partner: UNT Libraries Government Documents Department
open access

Method of removal of heavy metal from molten salt in IFR fuel pyroprocessing

Description: An electrochemical method of separating heavy metal values from a radioactive molten salt including Li halide at temperatures of about 500{degree}C. The method comprises positioning a solid Li-Cd alloy anode in the molten salt containing the heavy metal values, positioning a Cd-containing cathode or a solid cathode positioned above a catch crucible in the molten salt to recover the heavy metal values, establishing a voltage drop between the anode and the cathode to deposit material at the catho… more
Date: December 23, 1993
Creator: Gay, E.C.
Partner: UNT Libraries Government Documents Department
open access

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, while preserving the diamagnetism of a superconductor comprises the steps of (1) providing a ceramic superconductor; (2) continuously or intermittently generating an AC current to the ceramic superconductor; and (3) gradually decreasing the AC current until the undesired remanent field is dissipated.
Date: December 1993
Creator: Youngdahl, C. A.
Partner: UNT Libraries Government Documents Department
open access

Use of CHELEX-100{reg_sign} for radionuclide purification

Description: A method for selectively removing yttrium-90 from its parent strontium-90 contained in an environmental sample includes loading the sample onto a column containing a chelating ion-exchange resin capable of retaining yttrium-90; washing the column with a solution capable of removing strontium, calcium and other contaminants from the yttrium-90 fraction retained on the column; removing excess acetate salts from the column; eluting yttrium-90 solution from the column and adjusting the pH of this s… more
Date: December 1993
Creator: Huntley, M. W.
Partner: UNT Libraries Government Documents Department
open access

Passive gas separator and accumulator device

Description: A separation device employing a gas separation filter and swirler vanes for separating gas from a gas-liquid mixture is provided. The cylindrical filter uses the principle that surface tension in the filter pores prevents gas bubbles from passing through; the gas collects in the interior of the filter to form larger bubbles in the center of the device. The device is suited for microgravity since the swirlers induce a centrifugal force which forces liquid from the inner region through the pores … more
Date: November 29, 1993
Creator: Choe, Hwang & Fallas, T.T.
Partner: UNT Libraries Government Documents Department
open access

Method for Simultaneous Use of a Single Additive for Coal Flotation, Dewatering, and Reconstitution

Description: A single dose of additive contributes to three consecutive fine coal unit operations, i.e., flotation, dewatering and reconstitution, whereby the fine coal is first combined with water in a predetermined proportion so as to formulate a slurry. The slurry is then mixed with a heavy hydrocarbon-based emulsion in a second predetermined proportion and at a first predetermined mixing speed and for a predetermined period of time. The conditioned slurry is then cleaned by a froth flotation method to f… more
Date: November 9, 1993
Creator: Wen, Wu-Wey; Gray, McMahan L. & Champagne, Kenneth J.
Partner: UNT Libraries Government Documents Department
open access

Orthogonally interdigitated shielded serpentine travelling wave cathod ray tube deflection structure

Description: This invention comprises a new deflection structure which deflects a beam of charged particles, such as an electron beam, includes a serpentine set for transmitting a deflection field, and shielding frame for housing the serpentine set. The serpentine set includes a vertical serpentine deflection element and a horizontal serpentine deflection element. These deflection elements are identical and are interdigitatedly and orthogonally disposed relative to each other, for forming a central transmis… more
Date: October 27, 1993
Creator: Hagen, E.C. & Hudson, C.L.
Partner: UNT Libraries Government Documents Department
open access

Method and apparatus for container leakage testing

Description: This invention is an apparatus for use in 100% leak testing of food containers used in conjunction with a tracer gas. It includes a shell with entrance and exit air locks to create a controlled atmosphere through which a series of containers is conveyed by a conveyor belt. Pressure in the shell is kept lower than that in the containers and the atmosphere is made to flow with the containers so that a tracer gas placed in the packages before sealing them will leak more readily, but the leaked tra… more
Date: October 18, 1993
Creator: Kronberg, James W.
Partner: UNT Libraries Government Documents Department
open access

Simulation of pyroshock environments using a tunable resonant fixture

Description: Disclosed are a method and apparatus for simulating pyrotechnic shock for the purpose of qualifying electronic components for use in weapons, satellite, and aerospace applications. According to the invention, a single resonant bar fixture has an adjustable resonant frequency in order to exhibit a desired shock response spectrum upon mechanical impact. The invention eliminates the need for availability of a large number of different fixtures, capable of exhibiting a range of shock response chara… more
Date: September 30, 1993
Creator: Davie, N. T.
Partner: UNT Libraries Government Documents Department
open access

Apparatus and method for two-stage oxidation of wastes

Description: An apparatus and method for oxidizing wastes in a two-stage process. The apparatus includes an oxidation device, a gas-liquid contacting column and an electrocell. In the first stage of the process, wastes are heated in the presence of air to partially oxidize the wastes. The heated wastes produce an off-gas stream containing oxidizable materials. In the second stage, the off-gas stream is cooled and flowed through the contacting column, where the off-gas stream is contacted with an aqueous aci… more
Date: September 28, 1993
Creator: Fleischman, S. D.
Partner: UNT Libraries Government Documents Department
open access

Device for calibrating a radiation detector system

Description: The present invention relates to a device for calibrating a radiation detector system that is used for measuring the radionuclide intake of those exposed to radioactive materials. In particular, the present invention relates to a device that simulates a human chest and lungs with a modicum of internal radiation for use in calibrating radiation detectors.
Date: September 23, 1993
Creator: McFee, M. C.; Kirkham, T. J. & Johnson, T. H.
Partner: UNT Libraries Government Documents Department
open access

Method of improving catalytic activity and catalytics produced thereby

Description: A process for dissociating H{sub 2}S in a gaseous feed using an improved catalytic material is disclosed in which the feed is contacted at a temperature of at least about 275C with a catalyst of rutile nanocrystalline titania having grain sizes in the range of from about 1 to about 100 manometers. Other transition metal catalysts are disclosed, each of nanocrystalline material with grain sizes in the 1--100 nm range. This invention may have application to vehicle emissions control (three-way ca… more
Date: September 23, 1993
Creator: Beck, D. D. & Siegel, R. W.
Partner: UNT Libraries Government Documents Department
open access

Pipe crawler with stabilizing midsection

Description: This invention is comprised of a pipe crawler having a midsection that provides the stability and flexibility to allow the pipe crawler to negotiate curved and uneven segments of piping while traveling through piping systems. The pipe crawler comprises a front leg assembly, a rear leg assembly, a midsection with a gimbal at each end for connecting the midsection to the front and rear leg assemblies in a flexible manner, and an air cylinder for changing the distance between the front and rear le… more
Date: September 20, 1993
Creator: Zollinger, W.T. & Treanor, R.C.
Partner: UNT Libraries Government Documents Department
open access

Piping inspection instrument carriage

Description: This invention is comprised of a pipe inspection instrument carriage for use with a pipe crawler or other locomotion means for performing internal inspections of piping surfaces. The carriage has a front leg assembly, a rear leg assembly and a central support connecting the two assemblies and for mounting an instrument arm having inspection instruments. The instrument arm has means mounted distally thereon for axially aligning the inspection instrumentation and means for extending the inspectio… more
Date: September 20, 1993
Creator: Zollinger, W.T. & Treanor, R.C.
Partner: UNT Libraries Government Documents Department
open access

Imaging Fourier transform spectrometer

Description: This invention is comprised of an imaging Fourier transform spectrometer having a Fourier transform infrared spectrometer providing a series of images to a focal plane array camera. The focal plane array camera is clocked to a multiple of zero crossing occurrences as caused by a moving mirror of the Fourier transform infrared spectrometer and as detected by a laser detector such that the frame capture rate of the focal plane array camera corresponds to a multiple of the zero crossing rate of th… more
Date: September 13, 1993
Creator: Bennett, C. L.
Partner: UNT Libraries Government Documents Department
open access

Corrosion-resistant iridium-platinum anode material for high polarization application in corrosive acids

Description: The present invention relates to highly corrosion resistant components for use in an electrochemical cell. Specifically, these components are resistant to corrosion under very extreme conditions such as exposure to aqua regia in the presence of a constant current density of 100mA/m{sup 2}. The components are comprised of an iridium-platinum alloy that comprises less than 30% iridium. In a preferred embodiment of the present invention, the iridium-platinum alloy comprises 15-20% iridium. In anot… more
Date: September 8, 1993
Creator: Farmer, J.; Summers, L. & Lewis, P.
Partner: UNT Libraries Government Documents Department
open access

Nondestructive method and apparatus for imaging grains in curved surfaces of polycrystalline articles

Description: A nondestructive method, and associated apparatus, are provided for determining the grain flow of the grains in a convex curved, textured polycrystalline surface. The convex, curved surface of a polycrystalline article is aligned in a horizontal x-ray diffractometer and a monochromatic, converging x-ray beam is directed onto the curved surface of the polycrystalline article so that the converging x-ray beam is diffracted by crystallographic planes of the grains in the polycrystalline article. T… more
Date: September 8, 1993
Creator: Carpenter, D.A.
Partner: UNT Libraries Government Documents Department
open access

Wire brush fastening device

Description: A fastening device is provided which is a variation on the conventional nut and bolt. The bolt has a longitudinal axis and threading helically affixed thereon along the longitudinal axis. A nut having a bore extending therethrough is provided. The bore of the nut has a greater diameter than the diameter of the bolt so the bolt can extend through the bore. An array of wire bristles are affixed within the bore so as to form a brush. The wire bristles extend inwardly from the bore and are construc… more
Date: August 31, 1993
Creator: Meigs, R.A.
Partner: UNT Libraries Government Documents Department
open access

Gasket and snap ring installation tool

Description: This invention is comprised of a tool for installing a gasket and a snap ring including a shaft, a first plate attached to the forward end of the shaft, a second plate slidably carried by the shaft, a spring disposed about the shaft between the first and second plates, and a sleeve that is free to slide over the shaft and engage the second plate. The first plate has a loading surface with a loading groove for receiving a snap ring and a shoulder for holding a gasket. A plurality of openings are… more
Date: August 23, 1993
Creator: Southerland, J. M., Sr. & Barringer, C.N., Sr.
Partner: UNT Libraries Government Documents Department
open access

Apparatus for detecting the presence of a liquid

Description: This invention is comprised of an apparatus for detecting the presence of a liquid in a region, including an electrically passive sensor adapted for contacting the liquid, and an electrically active detector. The sensor is a circuit with a pair of spaced-apart terminals connected to a switch that closes in the presence of the liquid. The detector carries an alternating current with a resonant frequency. When the sensor is placed in a region and liquid is present, the circuit of the sensor is cl… more
Date: January 1, 1993
Creator: Kronberg, James W.
Partner: UNT Libraries Government Documents Department
open access

Conveyor with rotary airlock apparatus

Description: This invention is comprised of an apparatus for transferring objects from a first region to a second region, the first and second regions having differing atmospheric environments. The apparatus includes a shell having an entrance and an exit, a conveyer belt running through the shell from the entrance to the exit, and a horizontally mounted `revolving door` with at least four vanes revolving about its axis. The inner surface of the shell and the top surface of the conveyer belt act as opposing… more
Date: January 1, 1993
Creator: Kronbert, J.W.
Partner: UNT Libraries Government Documents Department
open access

Digital electronic bone growth stimulator

Description: The present invention relates to the electrical treatment of biological tissue. In particular, the present invention discloses a device that produces discrete electrical pulse trains for treating osteoporosis and accelerating bone growth. According to its major aspects and broadly stated, the present invention consists of an electrical circuit configuration capable of generating Bassett-type waveforms shown with alternative signals provide for the treatment of either fractured bones or osteopor… more
Date: January 1, 1993
Creator: Kronberg, James W.
Partner: UNT Libraries Government Documents Department
open access

Fiber optic probe for light scattering measurements

Description: This invention is comprised of a fiber optic probe and a method for using the probe for light scattering analyses of a sample. The probe includes a probe body with an inlet for admitting a sample into an interior sample chamber, a first optical fiber for transmitting light from a source into the chamber, and a second optical fiber for transmitting light to a detector such as a spectrophotometer. The interior surface of the probe carries a coating that substantially prevents non-scattered light … more
Date: January 1, 1993
Creator: Nave, S.E.; Livingston, R.R. & Prather, W.S.
Partner: UNT Libraries Government Documents Department
open access

Fiber optic signal amplifier using thermoelectric power generation

Description: A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communication, powered by a Pu{sub 238} or Sr{sub 90} thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu{sub 238} or Sr{sub 90} thermoelectric generator delivers power to the ampl… more
Date: January 1, 1993
Creator: Hart, M. M.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen