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Method for fabricating a seal between a ceramic and a metal alloy
A method of fabricating a seal between a ceramic and an alloy comprising the steps of prefiring the alloy in an atmosphere with a very low partial pressure of oxygen, firing the assembled alloy and ceramic in air, and gradually cooling the fired assembly to avoid the formation of thermal stress in the ceramic. The method forms a bond between the alloy and the ceramic capable of withstanding the environment of a pressurized water reactor and suitable for use in an electrical conductivity sensitive liquid level transducer.
Date:
July 24, 1981
Creator:
Kelsey, P.V. Jr. & Siegel, W.T.
System:
The UNT Digital Library
Hyper filter-fluorescer spectrometer for x rays above 120 keV
An apparatus utilizing filter-fluorescer combinations is provided to measure short bursts of high fluence x-rays above 120 keV energy, where there are no practical absorption edges available for conventional filter-fluorescer techniques. The absorption edge of the prefilter is chosen to be less than that of the fluorescer, i.e., E/sub PRF/ < E/sub F/, contrary to the prior art technique E/sub PRF/ > E/sub F/. In this way, the response function is virtually zero between E/sub PRF/ and E/sub F/ and well defined and enhanced in an energy band of less than 1000 keV above the 120 keV energy.
Date:
July 7, 1981
Creator:
Wang, C. L.
System:
The UNT Digital Library
Plasma channel optical-pumping device and method
A device and method are described for optically pumping a gaseous laser using blackbody radiation produced by a plasma channel which is formed from an electrical discharge between two electrodes spaced at opposite longitudinal ends of the laser. A preionization device which can comprise a laser or electron beam accelerator produces a preionization beam which is sufficient to cause an elctrical discharge between the electrodes to initiate the plasma channel along the preionization path. The optical pumping energy is supplied by a high voltage power supply rather than by the preionization beam. High output optical intensities are produced by the laser due to the high temperature black-body radiation produced by the plasma channel, in the same manner as an exploding wire type laser. However, unlike the exploding wire type laser, the disclosed invention can be operated in a repetitive manner by utilizing a repetitive pulsed preionization device.
Date:
July 17, 1981
Creator:
Judd, O.P.
System:
The UNT Digital Library
Magnetic testing probe
A cylindrical eddy current tube testing probe is disclosed. Current flow in dual electromagnetic coils separated by an eddy current sensing coil is so directed that magnetic fields of the electromagnet coils have components extending in opposite directions axially of the tested tube and components extending radially of the tube which add in the region of the eddy current sensing coil.
Date:
July 7, 1981
Creator:
Scott, G.W. & Chitwood, L.D.
System:
The UNT Digital Library
Thermal Control System and Method for a Passive Solar Storage Wall
A system and method are provided for controlling the storing and release of thermal energy from a thermal storage wall wherein said wall is capable of storing thermal energy from insolation. The system and method includes a device such as a plurality of louvers spaced a predetermined distance from the thermal wall for regulating the release of thermal energy from the thermal wall. This regulating device is made from a material which is substantially transparent to the incoming solar radiation so that when it is in any operative position, the thermal storage wall substantially receives all of the impacting solar radiation. The material in the regulating device is further capable of being substantially opaque to thermal energy so that when the device is substantially closed, thermal release of energy from the storage wall is substantially minimized. An adjustment device is interconnected with the regulating mechanism for selectively opening and closing it in order to regulate the release of thermal energy from the wall.
Date:
July 10, 1981
Creator:
Ortega, Joseph Kenneth Earl
System:
The UNT Digital Library
Fast transient digitizer
Method and apparatus are presented for sequentially scanning a plurality of target elements with an electron scanning beam modulated in accordance with variations in a high-frequency analog signal to provide discrete analog signal samples representative of successive portions of the analog signal; coupling the discrete analog signal samples from each of the target elements to a different one of a plurality of high speed storage devices; converting the discrete analog signal samples to equivalent digital signals; and storing the digital signals in a digital memory unit for subsequent measurement or display.
Date:
July 8, 1981
Creator:
Villa, F.
System:
The UNT Digital Library
Control system for a wound-rotor motor
A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristics.
Date:
July 17, 1981
Creator:
Ellis, James N.
System:
The UNT Digital Library
Neutron and gamma radiation shielding material, structure, and process of making structure
The present invention is directed to a novel neutron and gamma radiation shielding material consisting of 95 to 97% by weight SiO/sub 2/ and 5 to 3% by weight sodium silicate. In addition, the method of using this composition to provide a continuous neutron and gamma radiation shielding structure is disclosed.
Date:
July 6, 1981
Creator:
Hondorp, H.L.
System:
The UNT Digital Library
Thermoelectric refrigerator having improved temperature-stabilization means
A control system for thermoelectric refrigerators is disclosed. The thermoelectric refrigerator includes at least one thermoelectric element that undergoes a first order change at a predetermined critical temperature. The element functions as a thermoelectric refrigerator element above the critical temperature but discontinuously ceases to function as a thermoelectric refrigerator element below the critical temperature. One example of such an arrangement includes thermoelectric refrigerator elements which are superconductors. The transition temperature of one of the superconductor elements is selected as the temperature control point of the refrigerator. When the refrigerator attempts to cool below the point, the metals become superconductors losing their ability to perform as a thermoelectric refrigerator. An extremely accurate, first-order control is realized.
Date:
July 29, 1981
Creator:
Falco, Charles M.
System:
The UNT Digital Library
Method for determining the hardness of strain hardening articles of tungsten-nickel-iron alloy
The present invention is directed to a rapid nondestructive method for determining the extent of strain hardening in an article of tungsten-nickel-iron alloy. The method comprises saturating the article with a magnetic field from a permanent magnet, measuring the magnetic flux emanating from the article, comparing the measurements of the magnetic flux emanating from the article with measured magnetic fluxes from similarly shaped standards of the alloy with known amounts of strain hardening to determine the hardness.
Date:
July 29, 1981
Creator:
Wallace, S.A.
System:
The UNT Digital Library
Improved solvent extraction recovery of shale oil. [DOE patent application]
An improved process for solvent extraction of organic matter from shale by two extraction steps in sequence. The extraction steps are: (1) treating a kerogen-containing shale with a solvent system comprising a combination of water and an alcohol at a temperature of about 375 to 425/sup 0/C; and (2) treating the product of (1) with a solvent system comprising a combination of an alcohol and another organic solvent at an elevated temperature, but not above about 425/sup 0/C. The organic matter is recovered by separating the liquid which results from step (2) from the shale solids.
Date:
July 20, 1981
Creator:
McKay, John F. & Chong, Shuang-Ling
System:
The UNT Digital Library
Electrochemical cell and negative electrode therefor. [Li-Al anode]
A secondary electrochemical cell is described with the positive and negative electrodes separated by a molten salt electrolyte with the negative electrode comprising a particulate mixture of lithium-aluminum alloy and electrolyte and an additive selected from graphitized carbon, Raney iron or mixtures thereof. The lithium-aluminum alloy is present in the range of from about 45 to about 80% by volume of the negative electrode, and the electrolyte is present in an amount not less than about 10% by volume of the negative electrode. The additive of graphitized carbon is present in the range of from about 1 to about 10% by volume of the negative electrode, and the Raney iron additive is present in the range of from about 3 to about 10% by volume of the negative electrode.
Date:
July 29, 1981
Creator:
Kaun, T.D.
System:
The UNT Digital Library
One-piece, composite crucible with integral withdrawal/discharge section
A one-piece, composite open-bottom casting mold with integral withdrawal section is fabricated by thermal spraying of materials compatible with and used for the continuous casting of shaped products of reactive metals and alloys such as, for example, titanium and its alloys or for the gas atomization thereof.
Date:
July 30, 2002
Creator:
Besser, Matthew; Terpstra, Robert L. (Iowa State Univ., Ames, IA); Sordelet, Daniel J.; Anderson, Iver E.; Hartman, Alan D.; Argetsinger, Edward R. et al.
System:
The UNT Digital Library
Baling-Press
Patent for "improvements in baling presses: and it consists in a press having a suitable frame, a box mounted thereon having a hinged front and a hinged side." (lines 11-14) including instructions and illustrations.
Date:
July 17, 1900
Creator:
Stopple, John J.
System:
The Portal to Texas History
Check Row Planter
Patent for check row planter. Illustration included.
Date:
July 19, 1904
Creator:
Perkins, Albert L.
System:
The Portal to Texas History
Combination Lock Joint or Device.
Patent for a combination lock joint or device for sectional poles that prevents bending of the pole and allows for sections of the pole to be easily taken on or off.
Date:
July 25, 1911
Creator:
Carleton, Ernest William
System:
The Portal to Texas History
Buckle-Making Machine
Patent for a buckle making machine for forming wires into tie buckles for bales of cotton, hay, etc. Illustrations included.
Date:
July 30, 1912
Creator:
Frantz, Ezra A.
System:
The Portal to Texas History
Cane-Topper
Patent for "a device which may be readily secured to a wagon or any other suitable vehicle and which may be quickly adjusted so as to cut the tops of cane of different sizes" (lines 11-14).
Date:
July 2, 1901
Creator:
Palm, Oliver
System:
The Portal to Texas History
Attachment for Cultivators.
Patent for an improved arch-bar for cultivators that allows increasing and decreasing the space between drag bars without having to stop the team of horses.
Date:
July 31, 1906
Creator:
Weempe, Charles M.
System:
The Portal to Texas History
Car-Coupling.
Patent for a new and improved car coupler, including instructions and illustrations.
Date:
July 25, 1899
Creator:
Smith, Thomas Henry
System:
The Portal to Texas History
Boltless Rail-Joint
Patent for a rail joint designed without bolts. Illustrations included.
Date:
July 30, 1912
Creator:
Crawford, William R.
System:
The Portal to Texas History
Cotton-Chopper.
Patent for a cotton chopper, which can operate in uneven soil and attaches to a cultivator.
Date:
July 28, 1908
Creator:
Allen, John W.
System:
The Portal to Texas History
Coupling-Pin.
Patent for a coupling pin for railroad cars, which prevents the coupling from coming loose accidentally by having a key which locks the coupling in place and can only be undone by the cars operating systems. when it is time to disconnect the car.
Date:
July 23, 1907
Creator:
Yeiser, John Clarke
System:
The Portal to Texas History
Bale-Tie Buckle
Patent for a bale tie buckle made up of hooks that will not come apart under pressure.
Date:
July 23, 1912
Creator:
Eddleman, Dudley E. & McFarland, Frank H.
System:
The Portal to Texas History