447 Matching Results

Search Results

prev Results: 73 - 96 next
open access

Supported liquid membrane system

Description: A cell apparatus for a supported liquid membrane including opposing faceplates, each having a spirally configured groove, an inlet groove at a first end of the spirally configured groove, and an outlet groove at the other end of the spirally configured groove, within the opposing faces of the faceplates, a microporous membrane situated between the grooved faces of the faceplates, said microporous membrane containing an extractant mixture selective for a predetermined chemical species within the… more
Date: December 31, 1990
Creator: Takigawa, D. Y. & Bush, H. Jr.
Partner: UNT Libraries Government Documents Department
open access

Method and system for enhancing microbial motility

Description: A method and system for enhancing the motility of microorganisms by placing an effective amount of chlorinated hydrocarbons, preferably chlorinated alkenes, and most preferably trichloroethylene in spaced relation to the microbes so that the surprisingly strong, monomodal, chemotactic response of the chlorinated hydrocarbon on subsurface microbes can draw the microbes away from or towards and into a substance, as desired. In remediation of groundwater pollution, for example, TCE can be injected… more
Date: December 31, 1992
Creator: Hazen, T. C. & Lopez-De-Victoria, G.
Partner: UNT Libraries Government Documents Department
open access

Radiation detector using a bulk high {Tc} superconductor

Description: A radiation detector is provided, wherein a bulk high T superconducting sample is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the magnetic field will cause trapped flux redistributed Abrikosov fluxons and trapped Josephson fluxon… more
Date: December 31, 1992
Creator: Artusom, J. F.; Franks, L. A.; Hull, K. L. & Symko, O. G.
Partner: UNT Libraries Government Documents Department
open access

Analysis of hydrogen isotope mixtures

Description: Disclosed are an apparatus and a method for determining concentrations of hydrogen isotopes in a sample. Hydrogen in the sample is separated from other elements using a filter selectively permeable to hydrogen. Then the hydrogen is condensed onto a cold finger or cryopump. The cold finger is rotated as pulsed laser energy vaporizes a portion of the condensed hydrogen, forming a packet of molecular hydrogen. The desorbed hydrogen is ionized and admitted into a mass spectrometer for analysis.
Date: December 31, 1992
Creator: Villa-Aleman, E.
Partner: UNT Libraries Government Documents Department
open access

Velocity damper for electromagnetically levitated materials

Description: A system for damping oscillatory and spinning motions induced in an electromagnetically levitated material. Two opposed field magnets are located orthogonally to the existing levitation coils for providing a DC quadrupole field (cusp field) around the material. The material used for generating the DC quadrupole field must be nonconducting to avoid eddy-current heating and of low magnetic permeability to avoid distorting the induction fields providing the levitation.
Date: December 31, 1992
Creator: Fox, R. J.
Partner: UNT Libraries Government Documents Department
open access

Waste treatment process for removal of contaminants from aqueous, mixed-waste solutions using sequential chemical treatment and crossflow microfiltration, followed by dewatering

Description: It is an object of the claimed invention to combine chemical treatment with microfiltration process to treat groundwater, leachate from contaminated soil washing, surface and run-off waters contaminated with toxic metals, radionuclides and trace amounts of organics from variety of sources. The process can also be used to treat effluents from industrial processes such as discharges associated with smelting, mining and refining operations. Influent contaminants amenable to treatment are from a fe… more
Date: December 31, 1992
Creator: Vijayan, S.; Wong, Chi Fun & Buckley, L. P.
Partner: UNT Libraries Government Documents Department
open access

Extrusion of metal oxide superconducting wire, tube or ribbon

Description: A process and apparatus for extruding a superconducting metal oxide composition YBa{sub 2}Cu{sub 3}O{sub 7-x} provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6--85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for … more
Date: December 31, 1990
Creator: Dusek, Joseph T.
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

A pulverized coal fuel injector

Description: A pulverized coal fuel injector contains an acceleration section to improve the uniformity of a coal-air mixture to be burned. An integral splitter is provided which divides the coal-air mixture into a number separate streams or jets, and a center body directs the streams at a controlled angle into the primary zone of a burner. The injector provides for flame shaping and the control of NO/NO{sub 2} formation.
Date: December 31, 1991
Creator: Rini, M. J. & Towle, D. P.
Partner: UNT Libraries Government Documents Department
open access

Bioremediation of contaminated groundwater

Description: The present invention relates to a method for in situ bioremediation of contaminated soil and groundwater. In particular, the invention relates to remediation of contaminated soil and groundwater by the injection of nutrients to stimulate growth of pollutant-degrading microorganisms. The United States Government has rights in this invention pursuant to Contract No. DE-AC09-89SR18035 between the US Department of Energy and Westinghouse Savannah River Company.
Date: December 31, 1992
Creator: Hazen, T. C. & Fliermans, C. B.
Partner: UNT Libraries Government Documents Department
open access

Clay enhancement of methane, low molecular weight hydrocarbon and halocarbon conversion by methanotrophic bacteria

Description: The invention described in this report relates to a combined system of an apparatus and a method of increasing the rates of oxidation of gases and hazardous vapors by methanotrophic and other bacteria. The gases of interest are methane and trichlorethylene and other hazardous vapors. In a preferred embodiment, the oxidation rate of methane is improved by the addition of clays, e.g., kaolin, sometimes called ``China clay.``
Date: December 31, 1991
Creator: Apel, W. A. & Dugan, P. R.
Partner: UNT Libraries Government Documents Department
open access

Method for distinguishing normal and transformed cells using G1 kinase inhibitors

Description: A G{sub 1} phase kinase inhibitor is applied in a low concentration to a population of normal and transformed mammalian cells. The concentration of G{sub 1} phase kinase inhibitor is selected to reversibly arrest normal mammalian cells in the G{sub 1} cell cycle without arresting growth of transformed cells. The transformed cells may then be selectively identified and/or cloned for research or diagnostic purposes. The transformed cells may also be selectively killed by therapeutic agents that d… more
Date: December 31, 1991
Creator: Crissman, H. A.; Gadbois, D. M.; Tobey, R. A. & Bradbury, E. M.
Partner: UNT Libraries Government Documents Department
open access

Molybdenum disilicide composites reinforced with zirconia and silicon carbide

Description: This patent pertains to compositions consisting essentially of molybdenum disilicide, silicon carbide, and a zirconium oxide component. The silicon carbide used in the compositions is in whisker or powder form. The zirconium oxide component is pure zirconia or partially stabilized zirconia or fully stabilized zirconia. Fabrication, fracture toughness, and bend strength are covered.
Date: December 31, 1992
Creator: Petrovic, J. J.
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

No-carrier-added (NCA) aryl [{sup 18}F]fluorides via the nucleophilic aromatic substitution of electron rich aromatic rings

Description: A method for synthesizing no-carrier-added (NCA) aryl [{sup 18}F] fluoride substituted aromatic aldehyde compositions bearing an electron donating group is described. The method includes the step of reacting aromatic nitro aldehydes having a suitably protected hydroxyl substituent on an electron rich ring. The reaction is carried out by nucleophilic aromatic substitution with a no-carrier-added (NCA) [{sup 18}F]fluoride ion. The method can be used to synthesize various no-carrier-added aryl [{s… more
Date: December 31, 1991
Creator: Ding, Yu-Shin; Fowler, J. S. & Wolf, A. P.
Partner: UNT Libraries Government Documents Department
open access

Process for alloying uranium and niobium

Description: Alloys such as U-6Nb are prepared by forming a stacked sandwich array of uranium sheets and niobium powder disposed in layers between the sheets, heating the array in a vacuum induction melting furnace to a temperature such as to melt the uranium, holding the resulting mixture at a temperature above the melting point of uranium until the niobium dissolves in the uranium, and casting the uranium-niobium solution. Compositional uniformity in the alloy product is enabled by use of the sandwich str… more
Date: December 31, 1990
Creator: Holcombe, Cressie E.; Northcutt, Walter G.; Masters, David R. & Chapman, Lloyd R.
Partner: UNT Libraries Government Documents Department
open access

Simplified flangeless unisex waveguide coupler assembly

Description: A unisex coupler assembly is disclosed capable of providing a leak tight coupling for waveguides with axial alignment of the waveguides and rotational capability. The sealing means of the coupler assembly are not exposed to RF energy, and the coupler assembly does not require the provision of external flanges on the waveguides. In a preferred embodiment, O ring seals are not used and the coupler assembly is, therefore, bakeable at a temperature up to about 150{degrees}C. The coupler assembly co… more
Date: December 31, 1992
Creator: DiMartino, M. & Moeller, C. P.
Partner: UNT Libraries Government Documents Department
open access

Jet plume injection and combustion system for internal combustion engines

Description: This invention is comprised of an improved combustion system for an internal combustion engine is disclosed wherein a rich air/fuel mixture is furnished at high pressure to one or more jet plume generator cavities adjacent to a cylinder and then injected through one or more orifices from the cavities into the head space of the cylinder to form one or more turbulent jet plumes in the head space of the cylinder prior to ignition of the rich air/fuel mixture in the cavity of the jet plume generato… more
Date: December 31, 1992
Creator: Oppenheim, A. K.; Maxson, J. A. & Hensinger, D. M.
Partner: UNT Libraries Government Documents Department
open access

HEPA filter dissolution process

Description: This invention is comprised of a process for dissolution of spent high efficiency particulate air (HEPA) filters and then combining the complexed filter solution with other radioactive wastes prior to calcining the mixed and blended waste feed. The process is an alternate to a prior method of acid leaching the spent filters which is an inefficient method of treating spent HEPA filters for disposal.
Date: December 31, 1992
Creator: Brewer, K. N. & Murphy, J. A.
Partner: UNT Libraries Government Documents Department
open access

Propulsion and stabilization system for magnetically levitated vehicles

Description: A propulsion and stabilization system for an inductive repulsion type magnetically levitated vehicle which is propelled and stabilized by a system which includes propulsion windings mounted above and parallel to vehicle-borne suspension magnets. A linear synchronous motor is part of the vehicle guideway and is mounted above and parallel to superconducting magnets attached to the magnetically levitated vehicle.
Date: December 31, 1992
Creator: Coffey, H. T.
Partner: UNT Libraries Government Documents Department
open access

Silicon nitride reinforced with molybdenum disilicide

Description: Compositions of matter comprised of silicon nitride and molybdenum disilicide and methods of making the compositions, where the molybdenum disilicide is present in amounts ranging from about 5 to about 50 vol%.
Date: December 31, 1990
Creator: Petrovic, John J. & Honnell, Richard E.
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

Method for processing aqueous wastes

Description: This invention is comprised of a method for treating waste water such as that from an industrial processing facility comprising the separation of the waste water into a dilute waste stream and a concentrated waste stream. The concentrated waste stream is treated chemically to enhance precipitation and then allowed to separate into a sludge and a supernate. The supernate is skimmed or filtered from the sludge and blended with the dilute waste stream to form a second dilute waste stream. The slud… more
Date: December 31, 1992
Creator: Pickett, J. B.; Martin, H. L.; Langton, C. A. & Harley, W. W.
Partner: UNT Libraries Government Documents Department
open access

Magnetic gripper device

Description: A climbing apparatus is provided for climbing ferromagnetic surfaces, such as storage tanks and steel frame structures. A magnet assembly is rotatably mounted in a frame assembly. The frame assembly provides a pair of cam surfaces having different dimensions so that, when the frame is rotated, the cam surfaces contact the ferromagnetic surface to separate the magnet assembly from the surface. The different cam dimensions enable one side of the magnet at a time to be detached from the surface to… more
Date: December 31, 1992
Creator: Meyer, R. E.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen