USA As Represented by Secretary of the Navy

Thomas E Jones

Wayne C McGinnis

J Scott Briggs

Leopold J Johnson

Joseph F McCartney

Richard L Vore

Bird feeder

Bird feeder stand

A superconducting magnet module comprises an alternate series of abutting and coaxially aligned first and second superconductive magnet modules. The first magnet module includes a first substrate having opposed first and second faces and a bore filled with a superconductive material extending between the first and second faces. The first face is formed of an electrically conductive material and the second face is formed of an electrically insulating material. A first spiral track of the superconductive material is formed on the first face in electrical and thermal contact with the electrically conductive material. The first spiral track is melt fused to the superconductive material in the bore. The second magnet module includes a second substrate having opposed third and fourth faces. The third face is formed of an electrically conductive material and the fourth face is formed of the electrically insulating material. A second spiral track of the superconductive material is formed on the third face in electrical and thermal contact with the electrically conductive material. The modules are positioned so that the second track abuts the second face and is melt fused to the superconductor in the bore to provide the superconducting magnet with a solenoidal and monolithic superconductive current path. The melt-fused spiral tracks provide the superconducting magnet with a quasi-helical and monolithic superconductive current path which may be tailored to have a uniform critical current capacity.

Ceramic superconducting magnet using stacked modules

The present invention provides a method for determining the granular nature of superconductive materials and devices which includes the steps of: conducting a substantially rectangular current pulse through the superconductive material, maintaining the temperature of the superconductive material at a substantially constant temperature which does not exceed the critical temperature of the superconductive material; determining the amplitude of the current pulse; determining the electrical resistance, R, of the superconductive material resulting from conducting current pulse through the superconductive material; increasing the current until the electrical resistance of the superconductive material becomes saturated; determining the electrical resistance difference, .delta., between the electrical resistance, R, of the saturated superconductive material and a total normal state electrical resistance of the superconductive material; generating a first output signal if .vertline..delta..vertline..ltoreq..epsilon., where .epsilon. represents a predetermined limit, where the first output signal corresponds to the superconductive material having a homogenous microscopic morphology; and generating a second output signal if .vertline..delta..vertline.&gt;.epsilon., where the second output signal corresponds to the superconductive material having a granular morphology. The method may also be used to determine the saturated electrical resistances of the superconductive sample.

Method for determining the granular nature of superconductors using

A compact heater is designed for the deposition of thin films at high temperatures in an oxidizing atmosphere or in vacuum. The heater is designed to accommodate a small-diameter load-lock system in an ultra-high-vacuum deposition chamber, and can operate in 0 to 1 atmosphere of oxygen up to at least 800.degree. C. The compact design allows the heater, including a substantially isothermal substrate holder having the substrate affixed thereto, included temperature sensor and attached main body portion, to be loaded through a load-lock port with about a 2.5 inch inside diameter. Heat is generated resistively, and the substrates are heated directly by thermal conduction. The heater was designed specifically to heat substrates to precisely monitored temperatures during the growth of high-temperature superconducting thin films.

Compact substrate heater for use in an oxidizing atmosphere

The present invention provides a method for measuring the intragranular and ntergranular critical current of a granular superconductive material, comprising the steps of: 1) conducting a substantially rectangular electronic pulse through the material so as to conduct a current through the material such that when the intergranular critical current of the material is exceeded, any grains present in the material remain in a superconducting state when the current level is below the intragranular critical current; 2) measuring the current through the material while conducting the pulse; 3) measuring a voltage difference across the material while conducting the pulse; 4) determining the intergranular critical current through the material by discerning a non-zero voltage difference across the material and contemporaneously measuring the current; and 5) determining the intragranular critical current through the material by varying the current to discern a current level at which the electrical resistance of the material increases to that of the non-superconducting state as the grains of the material transition from the superconducting to a non-superconducting state. This method may also be used to determine the critical current of a homogeneous superconductive material.

Method for measuring the resistive transition and critical current in

A method and apparatus provides an essentially neutrally buoyant undersea ectronic data communications link. A bundle of continuous synthetic fibers each having a diameter of about ten microns has individualized metallized layers coated to a thickness of about one to three microns and the whole lot is covered by dielectric insulation. The synthetic fibers, aromatic polyamide fibers or graphite fibers, are relatively light-weight yet have high tensile strengths to assure a sufficient load bearing capability for the undersea use and the number of thin metallized coatings provide the electrical data transmission capability without unduly weighting down the cable. The dielectric insulation layer is disposed coaxially outwardly of the coated fibers and optionally is provided with an outer sheath of conductive material for a return path. However in some applications a seawater return path is better. The size of the undersea link is variable to accommodate different frequency responses and the material of the metallized layers is variable to allow for different weights and desired transmission characteristics. Optionally, the fibers can be intercalated fibers to aid in the transmission of signals.

Metallized synthetic cable

A battery cell and battery are disclosed in which a cathode layer and an de layer are separated by a nonconducting ion permeable membrane and are sandwiched between a pair of conducting polymer layers. The conducting polymer layers and the ion permeable membrane from two distinct compartments in which the cathode and anode of the cell, respectively are positioned. A liquid electrolyte is sealed in each compartment. The ion permeable membrane allows passage through it of selected ions.

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Spring Valley, CA, United States of America

Thomas E Jones