ItemMaterials and methods for enhanced photocatalyzation of organic compounds with palladium(United States Patent and Trademark Office, 1993-03-16) Adam Heller; Heinz Gerischer; Board of Regents, The University of Texas SystemNULL ItemSynchronization circuit for parallel processing(United States Patent and Trademark Office, 1993-03-09) Lipovski, G. Jack; Board of Regents, The University of Texas SystemAn apparatus and method for synchronizing parallel processors utilizing a lookahead synchronization circuit is provided by the present invention. A five gate logic circuit is formed as a cell and this cell can serve as a node in a tree logic operation circuit. The tree is capable of realizing a variety of fetch-and-operation, priority and operation-and-broadcast primitives and the cell can serve in a carry circuit of a binary adder. The tree may be pruned at any point and the circuit will continue to function for those nodes remaining in the tree. Processing elements are attached to leaf nodes of the tree. The present invention is capable of realizing the fetch-and-exclusive-OR, fetch-and-add, fetch-and-AND, fetch-and-OR, fixed priority schema, round-robin priority schema, hogging priority schema, swap, data exchange, broadcast, shift-function, broadcast-from-the-root, AND-and-broadcast, OR-and-broadcast, minimum-and-broadcast, maximum-and-broadcast, exclusive-OR-and-broadcast, fetch-and-minimum, and fetch-and-maximum primitives. The circuit affords significant power in synchronizing parallel processors utilizing simple cells configured in a tree structure. ItemMethod and apparatus for improving performance of AC machines(United States Patent and Trademark Office, 1993-02-23) John S. Hsu; Herbert H. Woodson; Board of Regents, The University of Texas SystemA method and apparatus for improving the performance of polyphase AC machines. The polyphase AC machines are excited both with a fundamental frequency and with an odd harmonic of the fundamental frequency. The fundamental flux wave and the harmonic flux wave will travel at synchronous speed in the air gap. This facilitates redistributing the flux densities in the machine and thereby increasing the total flux per pole in the machine. ItemMethod and apparatus for spinning projectiles fired from a rail gun(United States Patent and Trademark Office, 1993-02-23) William F. Weldon; Board of Regents, The University of Texas SystemA method and apparatus for imparting a spin to a projectile fired from a railgun. A projectile which is rotatable within the barrel of the railgun, and which includes a conductive element, is caused to pass through a magnetic field, causing the projectile to rotate. Preferably, the magnetic field will be established by a solenoidal magnet which is coaxial with the path of the projectile. ItemMethod and construction for control of current distribution in railgun armatures(United States Patent and Trademark Office, 1993-02-02) William F. Weldon; Herbert H. Woodson; Glen C. Long; Board of Regents, The University of Texas SystemAn electromagnetic railgun having a layer of low conductivity material along the rails to interface with the armature as the armature is propelled along the rails. The low conductivity material has been found to permit rapid current penetration between the layer and armature, thereby inhibiting undersirable high current density formation along the trailing edge of the armature. Advantageously, inhibiting the high current density formation permits use of a solid armature at velocities exceeding on kilometer per second. Preferably, the layer is composed of graphite or a graphite/copper mixture. A layer of copper or other high conductivity material is preferably laminated to the low conductivity graphite layer to reduce the overall railgun circuit resistance. In the preferred embodiment, the layer of low conductivity material increases in thickness from the breech to the muzzle to decrease railgun circuit resistance. ItemMethod of producing parts by selective beam interaction of powder with gas phase reactant(United States Patent and Trademark Office, 1993-01-26) Harris L. Marcus; David L. Bourell; Udaykumar Lakshminarayan; Board of Regents, The University of Texas SystemA method and apparatus for selectively sintering a layer of powder to produce a part comprising a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct the laser energy onto each layer of the powder to produce a sintered mass corresponding to a cross-section of the part. For each cross-section, the aim of the laser beam is scanned over a layer of powder and the beam is switched on to sinter only the powder within the boundaries of the cross-section. Powder is applied and successive layers sintered until a completed part is formed. Also disclosed is a method of forming a part by interaction of material in the powder layer with reactants in the surrounding atmosphere, at locations of the powder irradiated by the energy, or laser, beam. The reaction may be nitridation, oxidation or carburization of the powder, with the product being a chemical compound of one or more constituents in the powder with one or more gases in the atmosphere. Alternatively, reduction of the powder may be so enabled by the energy beam so that a metallic phase product is formed at the irradiated locations. Particular benefits of the invention include the densification of the material of the part as a result of the reaction, and the ability to form high temperature materials by way of a relatively low temperature process. ItemCatalyst and plasma assisted nucleation and renucleation of gas phase selective laser deposition(United States Patent and Trademark Office, 1992-12-08) Harris L. Marcus; Guisheng Zong; W. Richards Thissell; Board of Regents, The University of Texas SystemA method and apparatus for selectively depositing a layer of material from a gas phase to produce a part comprising a plurality of deposited layers. The apparatus includes a computer controlling a directed energy beam, such as a laser, to direct the laser energy into a chamber substantially containing the gas phase to preferably produce photodecomposition or thermal decomposition of the gas phase and selectively deposit material within the boundaries of the desired cross-sectional regions of the part. For each cross section, the aim of the laser beam is scanned over a target area and the beam is switched on to deposit material within the boundaries of the cross-section. Each subsequent layer is joined to the immediately preceding layer to produce a part comprising a plurality of joined layers. In an alternate embodiment of the present invention, a gas phase is condensed on a surface and a laser beam is used to selectively evaporate, transform, activate or decompose material in each layer. A catalytic environment can be created proximate or upon the target area to ensure that initial nucleation and renucleation layers are receptive to substantially rapid and uniform growth of gas phase material at the target location. The catalyst can be placed on the initial substrate layer and/or upon successive layers as the layers are being deposited on the outer surface of the evolving part. ItemProcess for preparing expanded porphyrins: large porphyrin-like tripyrroledimethine-derived macrocycles(United States Patent and Trademark Office, 1992-11-10) Toshiaki Murai; Jonathan L. Sessler; Gregory W. Hemmi; Board of Regents, The University of Texas System" The present invention involves a novel tripyrrole dimethine-derived ""expanded porphyrin"" (texaphyrin), the synthesis of such compounds, their analogs or derivatives and their uses. These expanded porphyrin-like macrocycles are efficient chelators of divalent and trivalent metal ions. Metal complexes of these compounds are active as photosensitizers for the generation of singlet oxygen and thus potentially for inactivation or destruction of human immunodeficiency virus (HIV-1), mononuclear or other cells infected with such virus and tumor cells as well. A variety of texaphyrin derivatives have been produced and many more are readily obtainable. Various metal (e.g., transition, main group, and lanthanide) complexes with the texaphyrin and texaphyrin derivatives of the present invention have unusual water solubility and stability which render them particularly useful. These metallotexaphyrin complexes have optical properties making them unique as compared to existing porphyrin-like or other macrocycles. For example, they absorb light strongly in a physilogically important region (i.e. 690-880 nm). These complexes also form long-lived triplet states in high yield and act as efficient photosensitizers for the formation of singlet oxygen. These properties, coupled with their high chemical stability and appreciable solubility in polar media such as water, add to their usefulness. " ItemSublimating and cracking apparatus(United States Patent and Trademark Office, 1992-10-20) Ben G. Streetman; Terry J. Mattord; Craig W. Farley; Board of Regents, The University of Texas SystemA sublimating and cracking device which may be used to produce a collimated beam of molecules from a solid source. The device includes an elongated sublimating tube and an elongated cracking tube adapted to be axially oriented off axis to each other. The sublimating and cracking tubes are interconnected and heated in use. ItemSapphyrins, derivatives and syntheses(United States Patent and Trademark Office, 1992-10-27) Jonathan L. Sessler; Michael John Cyr; Board of Regents, The University of Texas SystemThe present invention involves, in addition to many unique substituted sapphyrins, a novel method for synthesizing sapphyrins with good efficiency and high yield. An improved 9-step synthesis of substituted sapphyrins, e.g., the two C.sub.2 symmetric sapphyrins, compounds 2 and 4 of FIG. 1C, is described herein. This synthesis involves as an important step the condensation between a tripyrrane diacid and a diformyl bipyrrole. The key tripyrrane component is prepared in three high-yield steps from readily available pyrrolic precursors and the bipyrrole portion is prepared in four steps from ethyl 3-methyl-4-methylpyrrole-2-carboxylate in roughly 33% yield overall.