Abstract: The heat sinking substrate herein disclosed is comprised of a core consisting of a rigid graphitic solid in which hexagonal graphite crystallites are bond together by coal tar pitch, the core being enclosed by two metallic face sheets having a coefficient of thermal expansion suited to the electronic packages it supports. The substrate is designed to be installed into a module with a printed wiring board on either side, the module being installed in parallel with other like modules into a chassis. The heat generated by the electronics is input over the face of the substrate and withdrawn by cooling in the walls of the chassis with which the substrates are in good thermal contact. The grain of the core is aligned for maximum thermal conduction along the path to the chassis walls. The substrate is of low weight, has a CTE matched to the supported electronic packages, high thermal conductance, and uses low cost materials.

Abstract: A variable depth triangulation ranging system is reconfigurable in real time in the sense that any two of the three performance measures, standoff distance, depth of field, and range resolution at a point within the depth of field, are selected by the user and the system geometrically reconfigures itself to provide the requested performance. The system is composed of a light beam emitting component such as a laser, a linear photodetector, and an imaging lens component. Any of these components has a fixed location and the other two are movable and positioned so that the Scheimpflug condition to guarantee blur-free imaging of reflected target returns is satisfied; the laser beam, a plane axis through the imaging lens component, and an image line through the photodetector all intersect at a common point. A scanner assembly is added to scan the laser beam along a line and over an area.

Abstract: The present invention relates generally to insulated gate transistors and more particularly, to laterally implemented insulated gate transistors having improved current capacity and improved immunity to latch-up. Specifically, it has been found that a lateral insulated gate transistor fabricated on a heavily doped substrate such as a p+ substrate exhibits improved current density. Further, the inclusion of an additional heavily doped region such as a P+ region proximate the base region contributes to improved latch-up immunity within the device.

Abstract: The invention concerns an X-ray stand permitting isocentric movements and intended particularly for radio diagnosis. Stand includes a base supporting a binding clip having a first and second arm supporting respectively an X-ray source and receiver. According to a feature of the invention, binding clip includes a foot by which it is supported by the base by means of devices to move foot in a circular movement centered on an isocenter point.

Abstract: The present invention dicloses means and method for modulating the bypass flow in a mixed flow, variable cycle gas turbine engine. The engine includes means to vary the bypass flow and includes an augmentor and liner with coolant supplied by a portion of the bypass flow. The bypass flow pressure is modulated by sensing the pressure of the liner coolant and the pressure in the augmentor and varying the flow pressure as a function of P.sub.1, P.sub.2, or both.

Abstract: An improved gas turbine engine blade having increased resistance to foreign object damage is disclosed. The blade includes a swept-back leading edge portion in the tip region of the blade for improving resistance to tip curl due to foreign object impact.

Abstract: An improved combined cycle plant with a gas turbine, a steam turbine and a generator arranged in tandem on a single shaft system in the order aforementioned, including a single thrust bearing with rigidly coupled rotor members. A thrust bearing for the shaft system is supported in a bearing standard keyed to the foundation on the side of the steam turbine toward the gas turbine to restrain axial movement. The thrust bearing is preferably located in the compressor inlet of the gas turbine. The steam turbine comprises a first casing with the hihg pressure section supported in a bearing standard keyed to the foundation adjacent the thrust bearing. The second casing with the low pressure section is keyed to the foundation at its outlet in the center of the exhaust hood. In a preferred arrangement with a single flow low pressure turbine section, the second casing combines an intermediate pressure turbine section adjacent the generator receiving steam from the reheater.

Abstract: A rectangular antenna array includes a plurality of systolic vertical line arrays. Each vertical line array includes a plurality of signal processors. Within each line array, the signals received at any one moment are held or delayed as required, and the processors progressively form partial sums in an upward direction during first clock intervals and in a downward direction during alternate clock intervals. During each clock intervals, complete sums for one sample interval appear at an end of the vertical line array. The sums appear alternately at the top and the bottom of the line arrays. Beamforming in the horizontal direction is accomplished with systolic horizontal adders coupled to the tops and bottoms of the vertical line arrays. The horizontal adders transfer information and add in one direction during first clock intervals, and then in the other direction during third clock intervals of a four-interval cycle.

Abstract: An improved composite material which overcomes the moisture problem associated with other composite materials includes a protective waterproof coating of material such as a poly-para-xylylene over the composite material.

Abstract: Implantable artificial bladder and method for the collection of, the storage of, or the discharge of biological fluids using the natural peristaltic pressure of a patient's ureter or ureters or of an artifical ureter to fill a first chamber of the artificial bladder and a constant force stored energy means in a second chamber isolated by a rolling diaphragm from the first, said means biasing the rolling diaphragm against the first chamber and serving to empty the implantable artificial bladder.

Abstract: A bearing retainer for mounting for a bearing in an X-ray tube, the X-ray tube having a rotating anode supported on an anode shaft held within a hollow anode stem, the retainer being slidably fitted into a hollow anode stem to hold one bearing coaxially with the anode shaft and to permit axial motion of the bearing so held, where the sliding surface of the bearing retainer is coated with a solid lubricant, and wherein the bearing retainer includes a bearing flange not coated with lubricant which may be swaged around the outer race of the bearing to hold the bearing.

Abstract: A composition comprising an aromatic polycarbonate in admixture with an anti-yellowing effective amount of a compound of the formula ##STR1##

Abstract: Polycarbonate resins containing at least one divalent chain unit of the formula: ##STR1## wherein E represents a trivalent hydrocarbon radical, or a trivalent halogen-substituted hydrocarbon radical, are transitory cross-linkers prepared by thermal degradation of the corresponding acid esters (the ester group being removable under conditions of the degradation by a beta-elimination mechanism). Cross-linked polycarbonate resins exhibit enhanced fire-resistance, especially non-dripping. The cross-linkers are useful to cross-link any resin having a group reactive with a carboxyl group.

Abstract: Storage stable polyimide precursors are prepared from diesters of certain tetracarboxylic acids, including pyromellitic acid and 2,2-bis[4-(3,4-dicarboxyphenoxy)-phenyl]propane, and m-phenylenediamine, p-phenylenediamine, 4-aminophenyl ether or mixtures thereof. These polyimide precursors may be cured to form flexible polyimides useful in composite preparation.

Abstract: An improved high pressure sodium vapor lamp construction is provided for operation on sonic frequency pulses without excessive acoustic noise. The novel jacketed lamp construction employs non-magnetostrictive metal for the frame employed to suspend a ceramic arc tube within the outer jacket in combination with a particular orientation or placement for ring getter elements located within said outer envelope. Various lamp constructions embodying such improvement are disclosed to enable relatively noise free lamp operation.

Abstract: Polyamide-carbonate block copolymers are made by admixture of polyamides with carbonate polymers containing carboxyl groups or an ester groups capable of elimination to form carboxyl groups, in the presence of a polyepoxy linking agent, such as triglycidyl isocyanurate. Such block copolymers may be used as thermoplastics or as blending agents for polyamides and carbonate polymers.

Abstract: Apparatus for estimating torque generated by a switched reluctance machine utilizes a ROM table look-up scheme to generate a torque estimate based upon phase current and rotor position information. Each ROM address is accessed by digitizing and then combining sensed phase current and rotor position signals. Knowledge of the instantaneous torque output enables closed-loop torque control including appropriate adjustments of phase currents to reduce or eliminate torque pulsations.

Abstract: An insulated field effect semiconductor device having source and drain regions extending to opposed surfaces of its semiconductor body is bidirectional and capable of blocking voltages in either of two opposing polarities and comprises a four terminal device having source and drain electrodes disposed on the opposed surfaces and a base electrode all ohmically connected to corresponding portions of the semiconductor body. An insulated gate is provided in a trench which extends into the semiconductor body for controlling the conductivity of a channel region extending within the base region between the source and drain regions. The device is free of source-to-base and drain-to-base short circuits. Control circuits enable this device to conduct or block both polarities of a high current AC voltage applied across its source and drain terminals while preventing undesired avalanche breakdown within the device.

Abstract: Apparatus for laser processing, such as drilling of a workpiece, optionally has an optical fiber and output coupler for applying laser light to machine a workpiece and cause it to vibrate. An acoustic sensor is mounted on the workpiece, and a determining means, such as a computer, determines when the vibrations change, such as when they cease. The information can be used to change the laser pulse power and duration and the relative distance of the laser focal plane on the workpiece. A method of laser processing a workpiece causes vibrations in the workpiece by applying laser light to it, monitors the vibrations, and determines when they change.

Abstract: Polycarbonate resins containing at least one divalent chain unit of the formula: ##STR1## wherein E represents a trivalent hydrocarbon radical, or a trivalent halogen-substituted hydrocarbon radical, are transitory cross-linkers prepared by thermal degradation of the corresponding acid esters (the ester group being removable under conditions of the degradation by a beta-elimination mechanism). Cross-linked polycarbonate resins exhibit enhanced fire-resistance, especially non-dripping. The cross-linkers are useful to cross-link any resin having a group reactive with a carboxyl group.

Abstract: A rotary compressor includes a cylinder with a cylindrical compression chamber. A cylindrical piston is eccentrically movable within the chamber. A vane slot extends outwardly in the cylinder from and communicates with the chamber. A vane is reciprocatingly mounted in the vane slot for selective protrusion into and retroaction from the chamber to contact the piston. At least one noise reduction slot projects into the cylinder from its outer peripheral wall near the vane slot and extends completely between the ends of the cylinder.

Abstract: A gradient current speed-up circuit, for use in a higher-speed NMR imaging system with a gradient power amplifier and an associated gradient coil, has an energy-storage element, with an inductance typically between 5 and 20 times the inductance of the associated gradient coil. A plurality of semiconductor switching elements receive the current output of the energy-storage element; and the associated gradient coil is connected between selected ones of these semiconductors devices. The semiconductor devices are turned on and off in selected patterns, to cause the energy-storage element current to be suddenly applied to and removed from flow through the associated gradient coil.

Abstract: Fluorosilicone heat cured rubber compositions are prepared using a chain modifier mixture comprising vinyl terminated polysiloxanes and silanol terminated siloxanes which allow vinyl-on-chain-ends functionality to easily crosslink unhindered by perfluoroalkyl groups.

Abstract: The uniformity of a catalyst layer produced by laser decomposition of a catalyst source compound is substantially improved for patterned substrates whose characteristics vary along the path of a conductor line by providing a buffer layer of a metal such as Ti, Cr or Ni over the substrate prior to the laser induced decomposition of the catalyst source compound.

Abstract: The mechanical properties of polymer mixtures which comprise a polyphenylene ether, a polyamide, and an agent to improve the impact strength can be improved by using as an agent to improve the impact strength a mixture consisting of(a) 10-90 parts by weight of a partially hydrogenated diene-vinylaromatic diblock copolymer and,(b) 90-10 parts by weight of a partially hydrogenated diene-vinylaromatic polyblock copolymer having at least three blocks.

Abstract: A turning gear apparatus mounted adjacent the bull gear of a large turbomachine rotor has a carriage pivotably mounted to the frame, a first pinion rotatably mounted on the carriage, and a second pinion continuously engaging the first pinion and rotatably mounted to the frame coaxial with the carriage pivoting axis. The improvement comprises locating the carriage on the side of the bull gear where it rotates in an upward direction, with the axis of the second pinion located such that when the carriage is pivoted and the first pinion engages the bull gear, the axis of rotation of the first pinion is located on a selected angle below the horizintal substantially equal to the pressure angle of the bull gear tooth, resulting in substantially vertical reaction forces.

Abstract: Novel flame retardant agents comprise polyalkylene oxides or a derivative thereof and end-capped with brominated phthalimide groups, and have the general formulae ##STR1## R.sup.1 is alkylene of from about 2 to about 6 carbon atoms; R.sup.1 is alkyl of from about 1 to about 6 carbon atoms; n is from about 4 to about 40; n' is from about 3 to about 15; and n" is from about 1 to about 10. Thermoplastic compositions, for example, polyphenylene ether compositions, rendered flame retardant with the novel compounds have a high resistance to additive vaporization and surface liquid exudation as well as desirable high flow characteristics.

Abstract: Containment means for a luminaire that captures hot particles created by the unlikely event of a pressurized lamp rupture is disclosed. In one embodiment, the containment means comprises a mesh interposed between the lamp and a refractor of the luminaire typically formed of an acrylic material. The mesh captures hot particles having a sufficient heat capacity and temperature to create excess heat damage to the refractor.

Abstract: A composite is produced comprised of Y--Ba--Cu--O superconductive film having a zero resistance transition temperature of at least about 38 K, a zirconium dioxide film and a substrate wherein the zirconium dioxide film is intermediate the superconductive film and the substrate.

Abstract: A varistor device comprised of a multi-layer zinc oxide varistor matrix containing metallizations of silver.

Abstract: A hermetically sealed compressor unit includes a hermetically sealed casing having a side wall with a cylindrical inner surface; an electric motor is positioned within the casing and includes a stator with a cylindrical outer wall having an interfering fit with the casing side wall inner surface; a rotary compressor unit driven by the motor includes a cylinder spaced from the motor and having a cylindrical outer wall welded to the casing side wall at selected positions; and at least one stiffening ring positioned adjacent the cylinder and having a cylindrical outer wall of a larger diameter than said cylinder outer wall and having an interfering fit with the casing side wall inner surface.

Abstract: Linear polyethersulfones are prepared by ring-opening of a macrocyclic spirobiindane polyethersulfone oligomer composition. The ring-opening reaction is conducted in the presence of a basic reagent such as an alkali metal bisphenol salt, at a temperature in the range of about 300.degree.-400.degree. C.

Abstract: The temperature of a surface undergoing a radiation assisted thermally driven process is sensed by observation of the thermal emission from that surface and used to control the process. In a preferred embodiment, the blue edge of the thermal emission spectral distribution is detected to determine the surface temperature of a workpiece during a process such as laser-assisted chemical vapor deposition, and used to control this temperature. The temperature measuring system has means for focusing workpiece thermal emission and defining the field of view, a spectrometer to separate shorter wavelength light from other spectral components of the thermal emission, and a photon-counting system to detect the shorter wavelength light and generate a surface temperature signal. Systems to determine surface temperature at a spot and along a line have an optical prism to disperse the thermal emission into component wavelengths, and a multichannel photon-counting detector comprised of an intensified photodetector array.

Abstract: Branched polycarbonates are prepared by the reaction of at least one polyepoxy compound, preferably triglycidyl isocyanurate, with at least one carboxylic acid-terminated polycarbonate, preferably of the type prepared by employing t-butyl p-hydroxybenzoate as a chainstopper in an interfacial polycarbonate formation reaction followed by thermal elimination of isobutene. The branched polycarbonates have high melt viscosities and high complex viscosity ratios, and are particularly useful in such operations as blow molding.

Abstract: A Fusible electric switch is herein described for increased ratings within industrial electrical distribution circuits by the provision of an arc exhaust gas controller. The arc gas controller cools and deionizes the arc gases that are generated upon separation of the switch contacts and exhausts the gases in a predetermined direction outside the switch enclosure. Fuse pullers are arranged at one end of each of the switch fuses to facilitate both installation and removal of the fuses.

Abstract: A polyimide surface is pretreated in preparation for an adhesion promotion treatment and subsequent metallization on the surface, wherein the pretreatment comprises the steps of:(A) contacting the polyimide surface with an aqueous solution of nitric acid having a concentration of about 35 to about 70% by weight or an aqueous solution of hydrochloric acid having a concentration of about 10 to about 38% by weight;(B) rinsing the acid-treated polyimide surface with water so as to substantially remove the acid from the surface of the polyimide;(C) contacting the rinsed polyimide surface with a mild etching agent, resulting in the formation of a residual film on the polyimide surface;(D) contacting the etched polyimide surface with a basic solution, and(E) removing the residual film formed on the surface of the polyimide after contact with the mild etching agent in step (C).

Abstract: A method of reducing contamination caused by high intensity heating of metals is taught. Splatter, vapor droplets and particulate matter is collected to avoid return to the melt. An electric field is established in the heating zone to attract the vapor droplets and particles to charged plates.

Abstract: An electrodeless high-intensity-discharge lamp, having an envelope situated within the bore of an excitation coil and in the interior of which envelope is to be provided a discharge plasma driven by the excitation coil, is provided with a pair of starting electrodes each of which is either adjacent to, or entering the envelope through, the associated one of an opposed pair of envelope end surfaces. Coupling of a high voltage pulse between the pair of starting electrodes causes an electric field to be produced, between each electrode and the other one of the electrodes or the excitation coil, of magnitude and position sufficient to cause the material within the lamp envelope to create at least one spark channel in which the plasma can then be formed responsive to the normal field provided by the excitation coil.

Abstract: A liquid metal cooled nuclear reactor having a passive cooling system for removing residual heat resulting from fuel decay during reactor shutdown. The passive cooling system comprises a plurality of partitions surrounding the reactor vessel in spaced apart relation forming intermediate areas for circulating heat transferring fluid which remove and carry away heat from the reactor vessel. The passive cooling system includes a closed primary fluid circuit through the partitions surrounding the reactor vessel and a partially adjoining secondary open fluid circuit for carrying transferred heat out into the atmosphere.

Abstract: A microcomputer-based drive system for a switched reluctance motor requires no rotor position sensor and no discrete current sensors. Phase excitation is synchronized with rotor position by indirectly estimating rotor position according to instantaneous phase inductance. Current regulation is achieved by incorporating pilot devices for current sensing into the switching devices of the power converter and by employing a fixed off-time current chopping strategy. One application is for use in a laundering machine.

Abstract: An electronic energy meter is provided with a plurality of push button switches on the face of the meter which are selectively actuated by an actuator extending through the transparent cover to display various different meter functions. Switch restrictors are removably provided around a section of the actuator of selected switches which may then be readily actuated only from the inside of the meter, after unlocking and removing the cover.

Abstract: A holder for use with a plurality of optical fibers that illuminate a workpiece has a central bore through which the fibers extend. Screws and springs are used to adjust the orientation of the fibers with respect to each other in order to achieve different illumination patterns on the workpiece. Instead of the screws, motor driven micrometer shafts and wedges can be used. A method of processing a workpiece comprises adjusting the orientation of a plurality of optical fibers to obtain a selected illumination pattern on the workpiece, and illuminating the workpiece with high power laser beams eminating from the fibers.

Abstract: Carboxy-functionalized polycarbonates are prepared by incorporating a carboxylic acid-substituted phenol, preferably t-butyl p-hydroxybenzoate, as a chainstopper in a polycarbonate-forming reaction. The products are capable of forming copolymers with other polymers such as polyamides and functionalized olefin polymers, by generation of a carboxy group which reacts therewith.

Abstract: An electric incandescent lamp having an improved coiled refractory metal filament construction is disclosed which enables the lamp to provide a more precise light source. Various lamp and coiled filament configurations are disclosed to include employment of a reflective film for improved efficiency of lamp operation while a halogen substance can also be included in the inert gas filling for this purpose. A method to manufacture the disclosed lamp improvement is also provided.

Abstract: A moisture curable solventless organopolysiloxane composition is provided useful as an adherent construction sealant. Improved cure rate, higher elongation at break values and lower modulus RTVs are achieved by using a bis(ureido)silane as a coupler and an aminoxysiloxane as a crosslinker for a silanol-terminated polydiorganosiloxane base polymer.

Abstract: A structure for supporting a light source within an electric lamp having an internal reflective surfaces of reduced dimensions is disclosed. The structure spatially supports the central portion of the light source relative to the reflective surface and comprises a pair of electrically conductive post which are affixed within openings in the bottom portion of the reflector. Barrier means are provided to prevent a cement substance filling the opening from escaping and entering the inner confines of the reflector lamp. In one embodiment the barrier means for preventing such escape is a washer positioned over each of the post and in another embodiment a glass bead is placed around each of the post to provide such barrier means.

Abstract: A high-frequency transformer is constructed from a flexible circuit comprising a primary conductive film winding and one or more secondary conductive film windings disposed on a single dielectric membrane. The flexible circuit is folded to form a stack of primary winding layers interleaved with secondary winding layers and then inserted into a magnetic cup core. The flexible circuit is preferably patterned photolithographically.

Abstract: The present invention discloses means and method for modulating the bypass flow in a mixed flow, variable cycle gas turbine engine. The engine includes means to vary the bypass flow and includes an augmentor and liner with coolant supplied by a portion of the bypass flow. The bypass flow pressure is modulated by sensing the pressure of the liner coolant and the pressure in the augmentor and varying the flow pressure as a function of P.sub.1, P.sub.2, or both.