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open access

High-strength, creep-resistant molybdenum alloy and process for producing the same

Description: A wet-doping process for producing an oxide-dispersion strengthened (ODS), creep-resistant molybdenum alloy is disclosed. The alloy is made by adding nitrate or acetate salts of lanthanum, cerium, thorium, or yttrium to molybdenum oxide to produce a slurry, heating the slurry in a hydrogen atmosphere to produce a powder, mixing and cold isostatically pressing the powder, sintering in a hydrogen atmosphere, and thermomechanically processing (swaging, extruding, cold drawing) the product. The ODS… more
Date: 1997~
Creator: Bianco, Robert; Buckman, William R., Jr. & Geller, Clint B.
Partner: UNT Libraries Government Documents Department
open access

A method for synthesizing pollucite from chabazite and cesium chloride

Description: A method is described for immobilizing waste chlorides salts containing radionuclides and hazardous nuclear material for permanent disposal, and in particular, a method for immobilizing waste chloride salts containing cesium, in a synthetic form of pollucite. The method for synthesizing pollucite from chabazite and cesium chloride includes mixing dry, non-aqueous cesium chloride with chabazite and heating the mixture to a temperature greater than the melting temperature of the cesium chloride, … more
Date: August 11, 1997
Creator: Pereira, Candido
Partner: UNT Libraries Government Documents Department
open access

Acoustic energy-driven fluid pump and method

Description: Bulk fluid motion is promoted in a gaseous fluid contained within a conduit system provided with a diffuser without the need for a mean pressure differential across the conduit system. The contacting of the gaseous fluid with unsteady energy at a selected frequency and pressure amplitude induces fluid flow through the conical diffuser. The unsteady energy can be provided by pulse combustors, thermoacoustic engines, or acoustic energy generators such as acoustic speakers.
Date: December 1, 1997
Creator: Janus, Michael C.; Richards, George A. & Robey, Edward H.
Partner: UNT Libraries Government Documents Department
open access

An arc fault detection system

Description: An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load… more
Date: December 1, 1997
Creator: Jha, Kamal N.
Partner: UNT Libraries Government Documents Department
open access

Combined heat and mass transfer device for improving separation process

Description: A two-phase small channel heat exchange matrix for providing simultaneous heat transfer and mass transfer at a single, predetermined location within a separation column, whereby the thermodynamic efficiency of the separation process is significantly improved. The small channel heat exchange matrix is comprised of a series of channels having a hydraulic diameter no greater than 5.0 mm. The channels are connected to an inlet header for supplying a two-phase coolant to the channels and an outlet h… more
Date: December 1, 1997
Creator: Tran, Thanh Nhon
Partner: UNT Libraries Government Documents Department
open access

Constant field gradient planar cavity structure

Description: A cavity structure is described having at least two opposing planar housing members spaced apart to accommodate the passage of a particle beam through the structure between the members. Each of the housing members have a plurality of serially aligned hollows defined therein, and also passages, formed in the members, which interconnect serially adjacent hollows to provide communication between the hollows. The opposing planar housing members are spaced and aligned such that the hollows in one me… more
Date: December 1, 1997
Creator: Kang, Yoon W. & Kustom, R.L.
Partner: UNT Libraries Government Documents Department
open access

Cross flow flotation column for coal and minerals beneficiation

Description: An apparatus and process are disclosed for the separation of coal from pyritic impurities using a modified froth flotation system. The froth flotation column incorporates a helical track about the inner wall of the column in a region intermediate between the top and base of the column. A standard impeller located about the central axis of the column is used to generate a centrifugal force thereby increasing the separation efficiency of coal from the pyritic particles and hydrophilic tailings.
Date: December 1997
Creator: Lai, Ralph W. & Patton, Robert A.
Partner: UNT Libraries Government Documents Department
open access

Decontamination of matrices containing actinide oxides

Description: There is provided a method for removing actinides and actinide oxides, particularly fired actinides, from soil and other contaminated matrices, comprising: (a) contacting a contaminated material with a solution of at least one inhibited fluoride and an acid to form a mixture; (b) heating the mixture of contaminated material and solution to a temperature in the range from about 30 C to about 90 C while stirring; (c) separating the solution from any undissolved matrix material in the mixture; (d)… more
Date: December 1, 1997
Creator: Villarreal, Robert
Partner: UNT Libraries Government Documents Department
open access

Depleted uranium as a backfill for nuclear fuel waste package

Description: A method is described for packaging spent nuclear fuel for long-term disposal in a geological repository. At least one spent nuclear fuel assembly is first placed in an unsealed waste package and a depleted uranium fill material is added to the waste package. The depleted uranium fill material comprises flowable particles having a size sufficient to substantially fill any voids in and around the assembly and contains isotonically-depleted uranium in the +4 valence state in an amount sufficient … more
Date: December 1, 1997
Creator: Forsberg, Charles W.
Partner: UNT Libraries Government Documents Department
open access

Direct detection of x-rays for protein crystallography

Description: An apparatus and method for directly determining the crystalline structure of a protein crystal. The crystal is irradiated by a finely collimated x-ray beam. The interaction o f the x-ray beam with the crystal produces scattered x-rays. These scattered x-rays are detected by means of a large area, thick CCD which is capable of measuring a significant number of scattered x-rays which impact its surface. The CCD is capable of detecting the position of impact of the scattered x-ray on the surface … more
Date: December 1, 1997
Creator: Atac, Muzaffer & McKay, Timothy
Partner: UNT Libraries Government Documents Department
open access

Double opposite-end tubesheet design for a thermovoltaic energy converter

Description: A method and apparatus are disclosed for the direct conversion of energy by thermovoltaic energy conversion having first and second tubesheets, at least one photon emitter plate secured to and extending from the first tubesheet, at least one cold plate secured to and extending from the second tubesheet, a plurality of thermovoltaic cells disposed along oppositely disposed exterior surfaces of the cold plate, and means cooperating with the tubesheet for maintaining a vacuum between the photon em… more
Date: December 1, 1997
Creator: Ashcroft, John M.; Campbell, Brain C. & DePoy, David M.
Partner: UNT Libraries Government Documents Department
open access

A filtered cathodic arc deposition apparatus and method

Description: A filtered cathodic arc deposition method and apparatus are described for the production of highly dense, wear resistant coatings which are free from macro particles. The filtered cathodic arc deposition apparatus includes a cross shaped vacuum chamber which houses a cathode target having an evaporable surface comprised of the coating material, means for generating a stream of plasma, means for generating a transverse magnetic field, and a macro particle deflector. The transverse magnetic field… more
Date: December 1, 1997
Creator: Krauss, Alan R.
Partner: UNT Libraries Government Documents Department
open access

Fuel element design for the enhanced destruction of plutonium in a nuclear reactor

Description: A uranium-free fuel for a fast nuclear reactor comprising an alloy of Pu, Zr and Hf, wherein Hf is present in an amount less than about 10% by weight of the alloy. The fuel may be in the form of a Pu alloy surrounded by a Zr-Hf alloy or an alloy of Pu-Zr-Hf or a combination of both.
Date: December 1, 1997
Creator: Crawford, Douglas C.; Porter, Douglas L.; Hayes, Steven L. & Hill, Robert N.
Partner: UNT Libraries Government Documents Department
open access

High power X-ray welding of metal-matrix composites

Description: A method for joining metal-matrix composites (MMCs) by using high power x-rays as a volumetric heat source is provided. The method involves directing an x-ray to the weld line between two adjacent MMCs materials to create an irradiated region or melt zone. The x-rays have a power density greater than about 10{sup 4} watts/cm{sup 2} and provide the volumetric heat required to join the MMC materials. Importantly, the reinforcing material of the metal-matrix composites remains uniformly distribute… more
Date: December 1, 1997
Creator: Rosenberg, Richard A.; Goeppner, George A.; Noonan, John R.; Farrell, William J. & Ma, Qing
Partner: UNT Libraries Government Documents Department
open access

In-situ stabilization of radioactive zirconium swarf

Description: The method for treating ignitable cutting swarf in accordance with the present invention involves collecting cutting swarf in a casting mold underwater and injecting a binder mixture comprising vinyl ester styrene into the vessel to fill void volume; and form a mixture comprising swarf and vinyl ester styrene; and curing the mixture. The method is especially useful for stabilizing the ignitable characteristics of radioactive zirconium cutting swarf, and can be used to solidify zirconium swarf, … more
Date: December 1, 1997
Creator: Hess, Clay C.
Partner: UNT Libraries Government Documents Department
open access

Inherently safe helium-3 target canister for tritium production in fission systems

Description: A method and apparatus are described for creating tritium via the irradiation of {sup 3}He with thermal neutrons via the {sup 3}He(n,p)T reaction. Nuclear reactors can provide the required neutrons, but the safety of putting {sup 3}He in a reactor has been an issue. The invention reduces or eliminates the reactivity insertion which would be occasioned by a loss of {sup 3}He by providing a canister constructed partially of high neutron-absorbing materials, which will continue to absorb thermal n… more
Date: December 1, 1997
Creator: Houts, Michael G. & James, Brian J.
Partner: UNT Libraries Government Documents Department
open access

Low-cost exterior insulation process and structure

Description: The invention relates to a low-cost process for insulating walls comprising: (a) stacking bags filled with insulating material next to the exterior surface of a wall until the wall is covered, the stack of bags thus formed having fasteners to attach to a wire mesh (e.g., straps looped between the bags and fastened to the wall); (b) stretching a wire mesh (e.g., chicken wire or stucco netting) over the stack of bags, covering the side of the bags which is not adjacent to the wall; (c) fastening … more
Date: December 1997
Creator: Vohra, Arun
Partner: UNT Libraries Government Documents Department
open access

A method and apparatus for destroying hazardous organics and other combustible materials in a subcritical/supercritical reactor

Description: A waste destruction method is described using a reactor vessel to combust and destroy organic and combustible waste, including the steps of introducing a supply of waste into the reactor vessel, introducing a supply of an oxidant into the reactor vessel to mix with the waste forming a waste and oxidant mixture, introducing a supply of water into the reactor vessel to mix with the waste and oxidant mixture forming a waste, water and oxidant mixture, reciprocatingly compressing the waste, water a… more
Date: December 1, 1997
Creator: Janikowski, Stuart K.
Partner: UNT Libraries Government Documents Department
open access

A method and apparatus for sizing and separating warp yarns

Description: A slashing process for preparing warp yarns for weaving operations includes the steps of sizing and/or desizing the yarns in an acoustic resonance box and separating the yarns with a leasing apparatus comprised of a set of acoustically agitated lease rods. The sizing step includes immersing the yarns in a size solution contained in an acoustic resonance box. Acoustic transducers are positioned against the exterior of the box for generating an acoustic pressure field within the size solution. Ul… more
Date: December 1, 1997
Creator: Sheen, Shuh-Haw; Chien, Hual-Te; Raptis, Apostolos C. & Kupperman, David S.
Partner: UNT Libraries Government Documents Department
open access

Method for determining aerosol particle size, device for determining aerosol particle size

Description: A method for determining the mass median diameter D of particles contained in a fluid is provided wherein the data of the mass of a pre-exposed and then a post-exposed filter is mathematically combined with data concerning the pressure differential across the same filter before and then after exposure to a particle-laden stream. A device for measuring particle size is also provided wherein the device utilizes the above-method for mathematically combining the easily quantifiable data.
Date: December 1, 1997
Creator: Novick, Vincent J.
Partner: UNT Libraries Government Documents Department
open access

Method for priming and DNA sequencing

Description: A method is presented for improving the priming specificity of an oligonucleotide primer that is non-unique in a nucleic acid template which includes selecting a continuous stretch of several nucleotides in the template DNA where one of the four bases does not occur in the stretch. This also includes bringing the template DNA in contract with a non-unique primer partially or fully complimentary to the sequence immediately upstream of the selected sequence stretch. This results in polymerase-med… more
Date: December 1, 1997
Creator: Mugasimangalam, R. C. & Ulanovsky, L. E.
Partner: UNT Libraries Government Documents Department
open access

Method for producing low-cost, high volume hydrogen from hydrocarbon sources

Description: A method is described for the conversion of naturally-occurring or biomass-derived lower to higher hydrocarbon (C{sub x}H{sub y},where x may vary from 1--3 and y may vary from 4--8) to low-cost, high-volume hydrogen. In one embodiment, methane, the major component of natural gas, is reacted in a single reaction zone of a mixed-conducting ceramic membrane reactor to form hydrogen via simultaneous partial oxidation and water gas shift reactions at temperatures required for thermal excitations of … more
Date: December 1, 1997
Creator: Bose, Arun C.; Balachandran, Uthamalinga; Kleerfisch, Mark S.; Udovich, Carl A. & Stiegel, Gary J.
Partner: UNT Libraries Government Documents Department
open access

Method for removing heavy metal and nitrogen oxides from flue gas, device for removing heavy metal and nitrogen oxides from flue gas

Description: A method for the simultaneous removal of oxides and heavy metals from a fluid is provided comprising combining the fluid with compounds containing alkali and sulfur to create a mixture; spray drying the mixture to create a vapor phase and a solid phase; and isolating the vapor phase from the solid phase. A device is also provided comprising a means for spray-drying flue gas with alkali-sulfide containing liquor at a temperature sufficient to cause the flue gas to react with the compounds so as … more
Date: December 1, 1997
Creator: Huang, Hann-Sheng & Livengood, Charles David
Partner: UNT Libraries Government Documents Department
open access

A method for separating water soluble organics from a process stream by aqueous biphasic extraction

Description: The present invention relates to a method for separating water-miscible organic species from a process stream by aqueous biphasic extraction. In particular, the method includes extracting the organic species into a polymer-rich phase of an aqueous biphase system in which the process stream comprises the salt-rich phase, and, next, separating the polymer from the extracted organic species by contacting the loaded, polymer-rich phase with a water-immiscible organic phase. Alternatively, the polym… more
Date: December 1, 1997
Creator: Chaiko, David J. & Mego, William A.
Partner: UNT Libraries Government Documents Department
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