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Magnetron sputtered boron films and Ti/B multilayer structures

Description: A method is described for the production of thin boron and titanium/boron films by magnetron sputter deposition. The amorphous boron films contain no morphological growth features, unlike those found when thin films are prepared by various physical vapor 5 deposition processes. Magnetron sputter deposition method requires the use of a high density crystalline boron sputter target which is prepared by hot isostatic pressing. Thin boron films prepared by this method are useful for ultra-thin band… more
Date: March 11, 1991
Creator: Makowiecki, Daniel Matthew & Jankowski, Alan Frederic
Partner: UNT Libraries Government Documents Department
open access

Apparatus and method for critical current measurements

Description: An apparatus for the measurement of the critical current of a superconductive sample, e.g., a clad superconductive sample, the apparatus including a conductive coil, a means for maintaining the coil in proximity to a superconductive sample, an electrical connection means for passing a low amplitude alternating current through the coil, a cooling means for maintaining the superconductive sample at a preselected temperature, a means for passing a current through the superconductive sample, and, a… more
Date: March 15, 1991
Creator: Martin, J. A. & Dye, R. C.
Partner: UNT Libraries Government Documents Department
open access

Optical transcutaneous bilirubin detector

Description: This invention consists of a transcutaneous bilirubin detector comprising a source of light having spectral components absorbable and not absorbable by bilirubin, a handle assembly, electronic circuitry and a fiber optic bundle connecting the assembly to the light source and circuitry. Inside the assembly is a prism that receives the light from one end of the fiber optic bundle and directs it onto the skin and directs the reflected light back into the bundle. The other end of the bundle is trif… more
Date: March 4, 1991
Creator: Kronberg, J. W.
Partner: UNT Libraries Government Documents Department
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Method of producing amorphous thin films

Description: This invention dicloses a method for sintering particulate material (such as silica) with a laser beam to produce amorphous optical thin films on substrates.
Date: December 31, 1991
Creator: Brusasco, R. M.
Partner: UNT Libraries Government Documents Department
open access

Ringlight for use in high radiation

Description: The present invention relates generally to ringlight for providing illumination about a central viewing area and more particularly to an improved ringlight design suitable for use in automatic gaging applications conducted in hostile radioactive environments. It is a further object of the present invention to provide a ringlight which is relatively simple in construction and with few parts, and which is thus very reliable in operation. The above and other objects are achieved in the present inv… more
Date: March 6, 1991
Creator: Baylor, G. A. & Jacket, H. S.
Partner: UNT Libraries Government Documents Department
open access

Integrated process for reprocessing spent nuclear fuel

Description: This invention is comprised of a process for recovering nuclear fuel from spent fuel assemblies that employs a single canister process container. The cladding and fuel are oxidized in the container, the fuel is dissolved and removed from the container for separation from the aqueous phase, the aqueous phase containing radioactive waste is returned to the container. This container is also the disposal vessel. Add solidification agents and compress container for long term storage.
Date: March 6, 1991
Creator: Forsberg, C. W.
Partner: UNT Libraries Government Documents Department
open access

Process for producing clad superconductive materials

Description: A process for fabricating superconducting composite wire by the steps of placing a superconductive precursor admixture capable of undergoing a self propagating combustion in stoichiometric amounts sufficient to form a superconductive product within a metal tube, sealing one end of said tube, igniting said superconductive precursor admixture whereby said superconductive precursor admixture endburns along the length of the admixture, and cross-section reducing said tube at a rate substantially eq… more
Date: March 19, 1991
Creator: Cass, R. B.; Ott, K. C. & Peterson, D. E.
Partner: UNT Libraries Government Documents Department
open access

Secure communication of static information by electronic means

Description: This invention is comprised of a method and apparatus for the secure transmission of static data from a tag to a remote reader. Each time the static data is to be transmitted to the reader, the 10 bits of static data are combined with 54 bits of binary data, which constantly change from one transmission to the next, into a 64-bit number. This number is then encrypted and transmitted to the remote reader where it is decrypted to produce the same 64 bit number that was encrypted in the tag. With … more
Date: December 31, 1991
Creator: Gritton, D. G.
Partner: UNT Libraries Government Documents Department
open access

High flexibility, noncollapsing light weight hose

Description: This invention relates generally to a high-flexibility, light weight, noncollapsing hose and more particularly to such a hose having a large size and particularly useful as equipment draining a radioactively contaminated fluid through a noncontaiminated, isolated and restricted space with high confidence against kinking, collapse, or leaking even with large relative motion between the inlet and outlet ends of the hose. In the operation of nuclear facilities, such as nuclear reactors, processing… more
Date: February 1, 1991
Creator: Williams, D. A.
Partner: UNT Libraries Government Documents Department
open access

Current-matched, high-efficiency, multi-junction monolithic solar cells

Description: In this invention, the efficiency of a two-junction (cascade) tandem photovoltaic device is improved by adjusting (decreasing) the top cell thickness to achieve current matching. An example of the invention was fabricated out of Ga{sub 0.52}In{sub 0.48}P and GaAs. Additional lattice-matched systems to which the invention pertains include Al{sub x}Ga{sub l-x}/GaAs (x=0.3 {minus} 0.4), GaAs/Ge and Ga{sub y}In{sub 1-y}P/Ga{sub y+0.5}In{sub 0.5-{sub Y}} As (O<y<5).
Date: February 11, 1991
Creator: Olson, J. M. & Kurtz, S. R.
Partner: UNT Libraries Government Documents Department
open access

Method for exponentiating in cryptographic systems

Description: An improved cryptographic method utilizing exponentiation is provided which has the advantage of reducing the number of multiplications required to determine the legitimacy of a message or user. The basic method comprises the steps of selecting a key from a pre-approved group of integer keys g; exponentiating the key by an integer value e, where e represents a digital signature, to generate a value g{sup e}; transmitting the value g{sup e} to a remote facility by a communications network; recei… more
Date: December 31, 1992
Creator: Brickell, E. F.; Gordon, D. M. & McCurley, K. S.
Partner: UNT Libraries Government Documents Department
open access

Reflection mass spectrometry technique for monitoring and controlling composition during molecular beam epitaxy

Description: This invention is comprised of a method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in molecular fluxes incident on a substrate by accurately measuring the molecular fluxes reflected from the substrate. The reflected flux is extremely sensitive to the stat… more
Date: August 15, 1990
Creator: Brennan, T. M.; Hammons, B. E. & Tsao, J. Y.
Partner: UNT Libraries Government Documents Department
open access

Filtered cathodic arc source

Description: Disclosed is a continuous, cathodic arc ion source coupled to a macro-particle filter capable of separation or elimination of macro-particles from the ion flux produced by cathodic arc discharge. The ion source employs an axial magnetic field on a cathode (target) having tapered sides to confine the arc, thereby providing high target material utilization. A bent magnetic field is used to guide the metal ions from the target to the part to be coated. The macro-particle filter consists of two str… more
Date: December 31, 1992
Creator: Falabella, S. & Sanders, D. M.
Partner: UNT Libraries Government Documents Department
open access

Fail-safe storage rack for fuel rod assemblies

Description: This report discusses a fail-safe storage rack which is provided for interim storage of spent but radioactive nuclear fuel rod assemblies. The rack consists of a checkerboard array of substantially square, elongate receiving tubes fully enclosed by a double walled container, the outer wall of which is imperforate for liquid containment and the inner wall of which is provided with perforations for admitting moderator liquid flow to the elongate receiving tubes, the liquid serving to take up wast… more
Date: December 31, 1991
Creator: Lewis, D. R.
Partner: UNT Libraries Government Documents Department
open access

Metal recovery from porous materials

Description: The present invention relates to recovery of metals. More specifically, the present invention relates to the recovery of plutonium and other metals from porous materials using microwaves. 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: January 1, 1991
Creator: Sturcken, E. F.
Partner: UNT Libraries Government Documents Department
open access

Method and apparatus for determining two-phase flow in rock fracture

Description: One object of the present invention to provide an improved method and apparatus for measuring the relative permeability of a rock fracture to multiple phases in a manner which will provide even more uniform delivery of both wetting and non-wetting phases to the fracture edge. It is another object of the invention to provide an improved method and apparatus for measuring the permeability of multiple phases through a rock fracture which comprises delivering the respective phases through manifold … more
Date: December 31, 1992
Creator: Persoff, P.; Pruess, K. & Myer, L.
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

Traveling-wave photodetector

Description: The traveling-wave photodetector of the present invention combines an absorptive optical waveguide and an electrical transmission line, in which optical absorption in the waveguide results in a photocurrent at the electrodes of the electrical transmission line. The optical waveguide and electrical transmission line of the electrically distributed traveling-wave photodetector are designed to achieve matched velocities between the light in the optical waveguide and electrical signal generated on … more
Date: December 31, 1992
Creator: Hietala, V. M. & Vawter, G. A.
Partner: UNT Libraries Government Documents Department
open access

System to control contamination during retrieval of buried TRU waste

Description: Between 1950 and 1970 the Department of Energy`s Rocky Flats Plant generated transuranic (TRU) contaminated waste, which was buried at the Idaho National Engineering Laboratory. This waste must now be retrieved and sent to a permanent disposal site. During retrieval the main contaminates to be controlled are compounds of plutonium and americium. Since these substances are small sized, and extremely mobile, airborne concentrations must be kept to a minimum to effectively eliminate personnel upta… more
Date: December 31, 1991
Creator: Menkhaus, D. E.; Loomis, G. G.; Feldman, E. M.; Scott, D. W.; Mullen, C. K. & Meyer, L. C.
Partner: UNT Libraries Government Documents Department
open access

X-ray tomographic image magnification process, system and apparatus therefor

Description: A computerized three-dimensional x-ray tomographic microscopy system is disclosed, comprising: (a) source means for providing a source of parallel x-ray beams; (b) staging means for staging and sequentially rotating a sample to be positioned in the path of the beams; (c) x-ray image magnifier means positioned in the path of the beams downstream from the sample; (d) detecting means for detecting the beams after being passed through and magnified by the image magnifier means; and (e) computing me… more
Date: December 31, 1991
Creator: Kinney, J. H.; Bonse, U. K.; Johnson, Q. C.; Nichols, M. C.; Saroyan, R. A.; Massey, W. N. et al.
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

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

Inflatable containment diaphragm for sealing and removing stacks

Description: A diaphragm with an inflatable torus-shaped perimeter is used to seal at least one end of a stack so that debris that might be hazardous will not be released during removal of the stack. A diaphragm is inserted and inflated in the lower portion of a stack just above where the stack is to be cut such that the perimeter of the diaphragm expands and forms a seal against the interior surface of the stack.
Date: December 31, 1991
Creator: Meskanick, G. R. & Rosso, D. T.
Partner: UNT Libraries Government Documents Department
open access

Enhanced radiation resistant fiber optics

Description: A process for producing an optical fiber having enhanced radiation resitance is provided, the process including maintaining an optical fiber within a hydrogen-containing atmosphere for sufficient time to yield a hydrogen-permeated optical fiber having an elevated internal hydrogen concentration, and irradiating the hydrogen-permeated optical fiber at a time while the optical fiber has an elevated internal hydrogen concentration with a source of ionizing radiation. The radiation source is typica… more
Date: December 31, 1992
Creator: Lyons, P. B. & Looney, L. D.
Partner: UNT Libraries Government Documents Department
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