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Method and apparatus for injecting a substance into the bloodstream of a subject (open access)

Method and apparatus for injecting a substance into the bloodstream of a subject

An apparatus and method for injecting a substance, such as a radiopharmaceutical, into the bloodstream of a subject is described. The apparatus comprises an injection means, such as a servo controlled syringe, a means for measuring the concentration of that substance in the subject's bloodstream, and means for controlling the injection in response to the measurement so that the concentration of the substance follows a predetermined function of time. The apparatus of the subject invention functions to inject a substance into a subject's bloodstream at a rate controlled by an error signal proportional to the difference between the concentration of the substance in the subject's bloodstream and the predetermined function.
Date: May 29, 1981
Creator: Lambrecht, R. M.; Bennett, G. W.; Duncan, C. C. & Ducote, L. W.
System: The UNT Digital Library
Production of super-smooth articles (open access)

Production of super-smooth articles

Super-smooth rounded or formed articles made of thermoplastic materials including various poly(methyl methacrylate) or acrylonitrile-butadiene-styrene copolymers are produced by immersing the articles into a bath, the composition of which is slowly changed with time. The starting composition of the bath is made up of at least one solvent for the polymer and a diluent made up of at least one nonsolvent for the polymer and optional materials which are soluble in the bath. The resulting extremely smooth articles are useful as mandrels for laser fusion and should be useful for a wide variety of other purposes, for example lenses.
Date: May 29, 1981
Creator: Duchane, D. V.
System: The UNT Digital Library
Thermoelectric refrigerator having improved temperature-stabilization means (open access)

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 (open access)

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
Electrochemical cell and negative electrode therefor. [Li-Al anode] (open access)

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
Heat pipes for use in a magnetic field (open access)

Heat pipes for use in a magnetic field

A heat pipe configuration is described for use in a magnetic field environment of a fusion reactor. Heat pipes for operation in a magnetic field when liquid metal working fluids are used are optimized by flattening of the heat pipes having an unobstructed annulus which significantly reduces the adverse side region effect of the prior known cylindrically configured heat pipes. The flattened heat pipes operating in a magnetic field can remove 2 to 3 times the heat as a cylindrical heat pipe of the same cross sectional area.
Date: April 29, 1981
Creator: Werner, R. W. & Hoffman, M. A.
System: The UNT Digital Library
Clamshell tomograph (open access)

Clamshell tomograph

The invention is a tomograph modified to be in a clamshell configuration so that the ring or rings may be moved to multiple sampling positions. The tomograph includes an array of detectors arranged in successive adjacent relative locations along a closed curve in a first position in a selected plane, and means for securing the detectors in the relative locations in a first sampling position. The securing means is movable in the plane in two sections and pivotable at one point and only one point to enable movement of at least one of the sections to a second sampling position out of the closed curve so that the ends of the section which are opposite the point are moved apart a predetermined space.
Date: January 29, 1982
Creator: Derenzo, S.E. & Budinger, T.F.
System: The UNT Digital Library
Fuel-rod-retention device for a nuclear reactor. [Patent application] (open access)

Fuel-rod-retention device for a nuclear reactor. [Patent application]

A device is described for supporting a nuclear fuel rod in a fuel rod assembly which allows the rod to be removed without disturbing other rods in the assembly. A fuel rod cap connects the rod to a bolt which is supported in the assembly end fitting by means of a locking assembly. The device is designed so that the bolt is held securely during normal reactor operation yet may be easily disengaged and the fuel rod removed when desired.
Date: January 29, 1982
Creator: Hylton, C.L.
System: The UNT Digital Library
Apparatus for shifting the wavelength of light. [US patent application] (open access)

Apparatus for shifting the wavelength of light. [US patent application]

This invention, which resulted from a contract with the United States Department of Energy, relates to a means for shifting the wavelength of light and, more particularly, to a means for changing the wavelength of a laser beam so that the beam can be effectively used in a process for separation uranium isotopes. As disclosed in US Patent 3,940,615, /sup 235/U can be separated from /sup 238/U by selectively ionizing the /sup 235/U isotope in a vapor containing both /sup 235/U and /sup 238/U, this ionization being effected by passing a laser beam having a proper frequency (or wavelength) through the vapor. Doppler shifting of the wavelength of a laser beam to obtain an optimal light wavelength for ionizing /sup 235/U in such a separation process has been proposed heretofore. However, the applicants are aware of no apparatus for Doppler shifting of the wavelength of light that has the features or advantages of apparatus constructed in accordance with the principles of their invention. A light beam is reflected back and forth between a rotating body having a retroreflection corner at opposite ends thereof and a fixed mirror to change the wavelength of the light beam by the Doppler effect.
Date: January 29, 1982
Creator: McCulla, William H. & Allen, John D., Jr.
System: The UNT Digital Library
Method for forming microspheres for encapsulation of nuclear waste. (open access)

Method for forming microspheres for encapsulation of nuclear waste.

Microspheres for nuclear waste storage are formed by gelling droplets containing the waste in a gelation fluid, transferring the gelled droplets to a furnace without the washing step previously used, and heating the unwashed gelled droplets in the furnace under temperature or humidity conditions that result in a substantially linear rate of removal of volatile components therefrom. Fuel particles were also produced using this method.
Date: January 29, 1982
Creator: Angelini, Peter; Caputo, Anthony J.; Hutchens, Richard E.; Lackey, Walter J. & Stinton, David P.
System: The UNT Digital Library
Roundness calibration standard (open access)

Roundness calibration standard

A roundness calibration standard is provided with a first arc constituting the major portion of a circle and a second arc lying between the remainder of the circle and the chord extending between the ends of said first arc.
Date: January 29, 1982
Creator: Burrus, B.M.
System: The UNT Digital Library
Frequency spectrum analyzer with phase-lock (open access)

Frequency spectrum analyzer with phase-lock

A frequency-spectrum analyzer with phase-lock for analyzing the frequency and amplitude of an input signal is comprised of a voltage controlled oscillator (VCO) which is driven by a ramp generator, and a phase error detector circuit. The phase error detector circuit measures the difference in phase between the VCO and the input signal, and drives the VCO locking it in phase momentarily with the input signal. The input signal and the output of the VCO are fed into a correlator which transfers the input signal to a frequency domain, while providing an accurate absolute amplitude measurement of each frequency component of the input signal.
Date: July 29, 1981
Creator: Boland, Thomas J.
System: The UNT Digital Library