Abstract: A transceiver printed circuit board (PCB) includes an integrated circuit (IC) with at least two different functionality, a photodiode and a laser. The IC has a first side, a second side opposite to the first side, a third side connecting the first side and the second side, and a fourth side opposite to the third side. The photodiode and the laser are both located in a first space beside the first side. The functionality of a transimpedance amplifier, a laser driver, and a clock and data recovery is integrated into the IC.

Abstract: A transceiver printed circuit board (PCB) includes an integrated circuit (IC) with at least two different functionality, a photodiode and a laser. The IC has a first side, a second side opposite to the first side, a third side connecting the first side and the second side, and a fourth side opposite to the third side. The photodiode and the laser are both located in a first space beside the first side. The functionality of a transimpedance amplifier, a laser driver, and a clock and data recovery is integrated into the IC.

Abstract: A printed circuit board assembly comprises a printed circuit board (PCB) defining a mounting end and an opposite contacting end, a row of first pads on the mounting end, a row of second pads on the contacting end, and an edge connector on the contacting end electrically contacted with the second pads, and a high speed line module mounted on a top side of the PCB and including a group of conductive lines, the conductive lines extending parallel to each other over the plane of the PCB, each conductive line having two ends electrically connected to corresponding first and second pads, respectively.

Abstract: A method is provided for extracting helium from a relatively helium poor gas mixture through a pressure swing adsorption process which adhieves an enriched product gas containing over 50% helium. The gas mixture to be enriched is fed cyclically to four adsorber vessels ranged in parallel which successively pass through a pressure build-up, an adsorptive and a pressure relief phase, with pressure build-up and relief being in part brought about by pressure compensation with any one of the other adsorbers. The pressure-build up and relief phases include a series of three and four, respectively, steps involving alternating pressure levels. As a preliminary treatment, the process may include an initial step wherein the unenriched gas mixture is first fed through a series of pre-filters filled with activated carbon for removing higher hydrocarbons.

Abstract: Pressure swing adsorption with increased recovery of a highly adsorbable product gas component is carried out with a cycling in which, during the flushing phase, and at least over the latter portion thereof, the flushing gas has a concentration in the product gas component which is substantially equal to that of the product gas. To further increase the yield and the concentration of the product gas component in the product gas, the pressure in the absorber is reduced over a time period between the termination of the adsorption phase and the beginning of the desorption phase, with the effluent gas during this reduction in pressure being reused in the pressure swing adsorption cycle.

Abstract: A pressure-swing adsorption system is used to enrich the methane content of mine gas obtained from bores around mine shafts or galleries from the customary 25 to 45% by volume to a product gas quality of 50% by volume. Using a carbon molecular sieve adsorbent, the adsorption is carried out at 5 to 8 bar and is followed by a uniflow expansion to an intermediate pressure and a counterflow expansion to a flushing pressure of 1.1 to 2 bar. Counterflow flushing is carried out with waste gas and the product gas is a mixture of the gases obtained by counterflow expansion and flushing.

Abstract: Method for separating gas mixtures resulting from direct flow loading of adsorption reactors by means of a pressure change technique in a two stage adsorption reactor consisting of a prefilter and a separating filter, whereby strongly adsorbable impurities from the gas mixture are adsorbed in the prefilter and the remainder of the undesirable gas components are adsorbed in the separating reactor. Thereby, product gas flows off at the end of the separating reactor shortly before the passage therethrough of a non-desirable gas component. Thereafter, the prefilter and the separating reactor are disconnected and the prefilter is partially relieved by a gas counter flow and the separating reactor is partially relieved by direct gas flow. After reconnection of prefilter and separating reactor the unit is further released in the counter current, subsequently rinsed and is again brought to charge pressure in the direct or counter current.

Abstract: A method using pressure adsorption techniques for separating individual gas components from gas mixtures on adsorption agents in which a gas mixture is fed under increased pressure onto and in contact with an adsorption agent layer maintained in a separation reactor wherein undesirable gas components are adsorbed and thereafter the product gas is discharged so that a subsequent build up of pressure to adsorption pressure takes place in the layer by gas flow in reverse direction with respect to the adsorption direction followed by a subsequent adsorption stage wherein in accordance with the invention the pressure relief and rinsing action are caused to occur in two stages using reverse direction of slow with respect to the direction of adsorption; the relief gas obtained from the first reverse flow pressure relief stage is used as a rinsing gas for the first rinsing stage; the relief gas obtained from the second reverse flow pressure relief stage is discharged as a remainder gas and the product gas is used as

Abstract: Bodies are press-molded from a mixture of particulate fuel and a binder. These bodies are heated to a temperature between about 600.degree.-900.degree. C. in a rotary furnace to degas them. The degassing is carried out without subjecting the bodies to mechanical stresses and without permitting combustion of the expelled volatile gases. The resulting shaped coke has a greatly improved abrasion resistance.