Abstract: A method and system for removing hydrogen sulfide from a hot gas. In a moving bed absorber, sulfur compounds in the hot gas moving in a direction which is countercurrent to the direction of movement of the movable bed of metal oxide, react with metal oxide to form metal sulfide. The metal sulfide is regenerated to re-usable metal oxide in a moving bed regenerator. The regeneration is carried out with an oxygen-containing gas in which regenerator off-gas serves as a diluent to control oxygen concentration. In the regenerator, spent metal sulfide moves progressively through a single regeneration vessel having first, second and third regeneration stages. In the first and second regeneration stages, first and second oxygen and sulfur dioxide-containing gases move, respectively, in a direction which is cocurrent with the direction of movement of a movable bed of spent metal sulfide.

Abstract: 102 composition. The coating composition of the present invention is a moisture-curable polymethyl-n-hexylsilsesquioxane having a partially water-hydrolyzed, silane catalyst-containing condensation product of n-hexyltrimethoxysilane and methyltrimethoxysilane, the silane catalyst having at least one aminoalkyl-substituted group and at least one alkoxy-substituted group having at least 2 carbon atoms in the alkoxy group. The silane catalyst is also a co-curing agent and condenses with the n-hexyltrimethoxysilane and the methyltrimethoxysilane.

Abstract: A low alpha-particle-emitting ceramic composite cover which when used in a ceramic integrated circuit package to encapsulate an integrated circuit device, reduces soft errors caused by alpha-particles emitted from the ceramic material. An alpha-particle-absorbing barrier layer is attached to the major portion of the interior surface of the ceramic cover to absorb alpha-particles emitted by the ceramic material. The barrier layer may be an organic polymeric material or an inorganic high purity material. Preferably the barrier layer is a polyimide film which is attached to the ceramic cover by a glass sealant material. Various constructions of the composite cover and ceramic integrated circuit packages utilizing the composite cover are disclosed.

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: 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: An electrical power conversion circuit having a readily varied conversion ratio and accommodating bidirectional energy flows is disclosed. The converter employs a series connected and a shunt connected semiconductor switch which may be either unidirectional or bidirectional (depending upon whether AC/DC or DC only operation is sought) and an inductor. The switches are insulated gate voltage controlled devices with charge storing capacity present at the gate. The switches are operated from a variable duty cycle rectangular pulse which is differentiated at the leading and trailing edges to form two pairs of oppositely sensed short duration pulses. The two pairs of short duration pulses are then coupled by a transformer having two matched but oppositely sensed secondaries to the gate circuits of the two semiconductor switches.

Abstract: The output terminals of a three-phase, wye-connected AC source, whose voltage varies over a wide dynamic range, are connected to a pair of DC voltage buses through a pair of oppositely poled, half-wave rectifier networks and a pair of switches. Taps uniformly positioned on the phase windings are brought out through another half-wave rectifier network directly to one bus, and the source neutral is connected directly to the other bus through a diode. A control circuit, operating in response to the DC voltage appearing across the buses, opens and closes the switches to selectively switch the rectifier networks and diode in and out so as to limit the DC voltage to a predetermined, compressed dynamic range.

Abstract: An apparatus for transferring headed pins includes a frame having a pair of spaced, parallel side rails and an end plate secured between the side rails at one end thereof. A pair of plates are secured together and connected between the side rails at the other ends thereof. The pair of plates have at least a portion of their opposed surfaces spaced from each other, and have aligned holes therethrough for receiving the pins to be transferred. A third plate having openings therethrough is slidable in the space between the pair of plates. An operating rod is connected to the third plate and can move the third plate between a first position in which the holes in the third plate are aligned with the holes in the pair of plates, and a second position in which the holes in the third plate only partially overlap the holes in the pair of plates. With the third plate in its second position, pins can be inserted through the holes and will not pass completely therethrough so that they will be held in the apparatus.

Abstract: A method and system for removing hydrogen sulfide from a hot gas. In a moving bed absorber, sulfur compounds in the hot gas moving in a direction which is countercurrent to the direction of movement of the movable bed of metal oxide, react with metal oxide to form metal sulfide. The metal sulfide is regenerated to re-usable metal oxide in a moving bed regenerator. The regeneration is carried out with an oxygen-containing gas in which regenerator off-gas serves as a diluent to control oxygen concentration. In the regenerator, spent metal sulfide moves progressively through a single regeneration vessel having first, second and third regeneration stages. In the first and second regeneration stages, first and second oxygen and sulfur dioxide-containing gases move, respectively, in a direction which is cocurrent with the direction of movement of a movable bed of spent metal sulfide.

Abstract: An apparatus for feeding headed pins includes a frame having thereon a hopper into which the pins are placed. A ramp extends substantially horizontally from the hopper and has a plurality of spaced, parallel slots therein which are adapted to receive the pins with the heads of the pins seated on the surface of the ramp. At the end of the ramp is a transfer shuttle assembly which is adapted to feed pins from the slots into passages in a chute which extends vertically downwardly from the end of the ramp. The upper ends of the passages are offset from the ends of the slots. The shuttle transfer means includes a shuttle plate movable back and forth across the end of the ramp by means of pneumatic cylinders, and a plurality of gates mounted on the shuttle plate. Each gate has a notch in its end which can receive a pin.

Abstract: An indexable disposable insert having six contiguous edge faces having alternate acute and obtuse angled corners, cutting edges being formed at the junction of at least one of the hexagonal side faces and each of the six contiguous edge faces, the hexagonal side face forming the cutting edge having a chip breaker extending around the face, the chip breaker extending inwardly from each of the cutting edges, and being tapered in plan configuration behind each alternate cutting edge.

Abstract: By the method there are supplied in an atomizing conditioning plant such chemicals as can react with the gases that it is desired to remove, and which chemicals after having reacted partially with said gases are taken out from the atomizing conditioning chamber as a dry powder and in this condition returned to the chamber to a zone immediately around the atomizer. In this way it is possible to obtain a higher degree of utilization of the chemicals supplied, and potentially a better degree of purification than in the case of conventional methods.The plant comprises a conditioning chamber (1) with an inlet (2) and an outlet (3) for flue gases, an atomizer (7) and members (8,9,10) to supply a chemical which reacts with the gases that are to be removed, as well as members (11,12) to remove from the chamber products of the reaction and non-reacted chemical as a dry powder.

Abstract: To maintain alignment of the lower ends of the multiple electrode panels of an electrostatic precipitator collector electrode, an alignment device is utilized having an elongated bar mounted adjacent its ends in aligned underlying relation with the bottom edges of the electrode panels which are suspended in lateral edge-to-edge, essential coplanar relation. The bar, in turn, mounts a distributed plurality of pairs of opposed wicket-shaped aligning elements in flanking relation with the lower end portion of each panel to resist lateral, swaying movement, while permitting the limited panel motion occurring during normal precipitator operation.

Abstract: Process and apparatus for the removal of sulfur oxides from sulfur oxide-containing gas with simultaneous production of ammonium sulfate. The process is carried out in a single vessel having an ammonium sulfate scrubbing zone; an ammonium sulfate liquor reservoir having a neutralization zone, a sulfur oxide oxidation zone, and a product removal zone; and a scrubbed gas removal zone. The sulfur oxide-containing gas is introduced into the ammonium sulfate scrubbing zone and passes countercurrent to droplets or a spray of ammonium sulfate liquor. The ammonium sulfate liquor absorbs the sulfur oxide in the scrubbing zone, and the liquor having the absorbed sulfur oxide therein collects in the ammonium sulfate liquor reservoir where aqueous ammonia is introduced into the neutralization zone and an oxygen-containing gas is introduced into the sulfur oxide oxidation zone.

Abstract: A three-sided indexable, detachable insert having a positive rake for a cutting tool. The insert has three edge faces and two side faces, each edge face having one or more recesses which extend across the whole of the edge face, substantially transversely to the cutting edge formed where each edge face meets one of the side faces of the insert. The recesses are spaced apart from a plurality of coplanar lands, the number of recesses on each edge face being the same. The width of the recesses is the same as half the width or less than half the width of the intervening lands. Each intervening land is positioned such that is provides in operation a cutting edge to wipe the material left by the recesses of any of the other sides.

Abstract: An internal flue gas bypass system is provided in a baghouse filter system having a plurality of filter compartments each having a gas inlet for receiving particulate-laden gas, a gas outlet for delivering filtered gas, fabric filter means between the gas inlet and the gas outlet, means for selectively blocking the gas inlet of each compartment, a gas inlet manifold connected to a source of particulate-laden gas and to the gas inlet of a plurality of filter compartments, and a gas outlet manifold connected to the gas outlet of a plurality of filter compartments and to a baghouse clean gas outlet. At least a portion of the gas outlet manifold has a common wall with the gas inlet manifold so that the gas outlet manifold is mounted internally in the baghouse adjacent the gas inlet manifold, and at least one poppet damper means is positioned in the common wall thereby providing an internal bypass means for passing particulate-laden gas from the gas inlet manifold to the gas outlet manifold.

Abstract: A high capacity gas filter having a particulate collector hopper having a bag housing mounted thereon with the walls of the housing extending outwardly and upwardly from the hopper. The walls terminate in gas passages which may be covered by outwardly extending hoods open at the underside thereof so as to provide for entrance of the dirty air. This opening extends substantially the entire periphery of the housing. A rigid tube sheet having orifices therein extends across the top of the bag housing and rigid frames support bag filters extending downwardly below the orifices and into the housing. A clean air plenum is mounted above the rigid sheet and is connected to a blower for pulling air through the gas passage, downwardly and inwardly along and through the filters and into the clean air plenum. This configuration permits a lower velocity air input and thus provides a higher air-to-cloth ratio while substantially reducing bag deterioration.

Abstract: A method for controlling the cleaning of multiple-baghouse fabric filter systems. Each baghouse includes a plurality of compartments and a cleaning system of a type which cleans the compartments in a compartment-by-compartment sequence and which allows all compartments not being cleaned to maintain the baghouse on-line even during a cleaning operation. The particular cleaning system disclosed more particularly is of the reverse gas flow type. A normal characteristic of reverse gas flow cleaning is that system pressure drop goes through sequential peaks and minimums. In the systems disclosed herein, the cleaning cycles of the individual baghouses are staggered in a manner such that the peak resistance during cleaning of one baghouse does occur at the same time as a lower and offsetting resistance of another baghouse. Thus, peak pressure drop of the system as a whole is reduced. Moreover, the difference in pressure loss from peak to minimum is reduced.

Abstract: A tool holder clamping and unclamping device utilizes a special combination of a Belleville spring biased bolt threading device to actuate a ball detent mechanism to lock a tool holder in the device.

Abstract: A coated carbide insert has a cobalt enriched zone at one decarburized surface, and a thin TiN transition layer over this surface. The cobalt enriched zone and the TiN layer cooperate to support additional thicker layers of hard wear resistant material such as TiC, TiN, and Al.sub.2 O.sub.3.