Abstract: A system for the just-in time scheduling of camshaft timing for an internal combustion engine. A slave circuit generates an execution period corresponding to the execution period of the variable camshaft timing mechanisms. The control processor initiates the calculation of a correction signal base on the difference between the desired camshaft timing and the actual camshaft timing synchronous with the execution period of the variable camshaft timing mechanism. The calculation of the correction signal is executed by the central processing unit once and only once for each execution period of the variable camshaft timing mechanism.

Abstract: A detector for X-radiation or other ionizing radiation comprises a pair of curved metal bars lying in spaced apart parallel planes. Ceramic members are bonded to the respective bars in facing relationship. Each ceramic member has a plurality of radially extending circumferentially spaced grooves facing similar grooves in the other member. A plurality of electrode plates are held in juxtaposed and circumferentially spaced apart relationship by disposing their respective upper and lower edges in the grooves of opposed ceramic members. The faces of adjacent electrode plates define gas-filled gaps in which photoelectron-ion pairs are produced when radiation enters from the front edges of the plates. The above described assembly is disposed within a pressurized gas-filled chamber having an X-ray transmissive window adjacent the front edges of the plates. A cover encloses the chamber. It has insulator feed-throughs for connecting the electrode plates with external electric circuits.

Abstract: An array of closely spaced injection lasers is mounted upon a common substrate of grooved semiconductor or insulating material, with the active (hot) layers of the lasers as close as possible to the substrate. Individual grooves of relatively large cross-sectional area are formed in the portions of the substrate upon which the respective lasers are seated, each of these grooves underlying a respective one of the lasers, and each groove is filled with a material that has high thermal and electrical conductivity, thereby providing a massive beam lead which also serves to dissipate heat generated by the respective laser. The walls of the grooves are treated to provide electrical isolation between the beam leads, so that these leads can be used to establish individual switching connections to the active elements of the respective lasers.

Abstract: An array of collimated wise aperture electrically pumped leaky corrugated AlGaAs optical waveguide lasers is formed on a single chip by etching a series of grooves oriented with respect to the crystalographic planes to isolate discrete lasers in the array and provide the requisite orientation of the internal reflecting surfaces to support the lasing action. The corrugation period is chosen such that the laser radiation exits from the array in a direction normal to the plane of waveguide.

Abstract: A digital data switching system is designed for rapid calling of data machines by subscriber polling equipment. In the event, however, that calls cannot be completed due, for example, to busy conditions of called machines or to failure of machines to answer the calls, the polling equipment is precluded from rapidly initiating new calls that overload the common control equipment. A timing circuit delays the initiation of new calls by blocking requests for the services of the common control equipment if completion of the previous call is unsuccessful and the common control equipment is continuously active.