Abstract: A vacuum pump aggregate utilizes a microprocessor in conjunction with pressure and temperature sensors and motor control circuits to regulate the pressure by varying the speed of one or more vacuum pumps. Measured temperature and/or pressure values are compared with predetermined values by the microprocessor which in turn adjusts the speed of the motors.

Abstract: Digitized FM signals are fed to a sample-and-hold circuit followed by a first sampling stage which is clocked by a second sampling signal whose frequency is an integral multiple of the frequency of a first sampling signal. The output of the first sampling stage is coupled to the input of an interpolating filter which is clocked by the second sampling signal, and whose output is sampled in a second sampling stage clocked by the second sampling signal. The output of the second sampling stage is coupled to the inputs of two zero-crossing detectors each of which drives a group-delay-controlled monostable multivibrator. The output signals of the latter are added with an average-value compensation signal in an adder whose output is sampled in a third sampling stage clocked by the second sampling signal, and fed to a digital conversion filter clocked by the first and second sampling signals and a third sampling signal.

Abstract: To minimize water consumption and to provide enhanced suction ability in a liquid ring vacuum pump the temperature of the exhaust liquid is measured and the amount of operating liquid supplied to the pump is varied.

Abstract: An electrically programmable memory cell contains a source-drain series arrangement of a field-effect select transistor arrangement and a complementary pair of memory transistors arranged between a first bit line and a second bit line. The pair of memory transistors comprises a common electrically floating storage gate and a common control gate which is connected to one programming line. Each of the electrodes of the select transistors is connected to the row selecting line associated therewith. The drain regions which are connected to one another, are lead to a read line. The memory cell according to the invention permits reading without requiring any significant DC power, and programming by using the complete programming voltage as available.

Abstract: A method and a device for monitoring hydro turbine plants. The device comprises one or several hydro turbines, at least one of them having adjustable vanes. For optimum utilization of the available amount of water, the vane angles in the turbine are automatically adjustable in dependence on the level in the water dam, which level is measured at predetermined intervals. When the plant comprises several turbines, the level indicator is also used for start and stop.

Abstract: The adder/subtracter disclosed sums a plurality of n-digit binary-coded numbers (A, B, C . . . Z) successively by forming corresponding partial sums (Sb, Sc . . . Sz) according to the following recursive formula:A+B+C . . . +Z=((A+B)+C) . . . +Z=(Sb+C) . . . +Z=Sc . . . +Z=Sz.The partial sums are formed by means of parallel adders/subtracters which, in turn, include adder/subtracter stages. Each of the stages is formed by a full adder and a switching section which forms the ones complement of the subtrahend in case of subtraction. The inputs of the parallel adder/subtracter for the first partial sum are preceded by series-connected like delay elements beginning with the second lowest weight and increasing by one from weight to weight, the delay provided by the delay elements being equal to the time required to generate the carry of the full adder.

Abstract: Dopants in semiconductor bodies which have been deactivated during processing are reactivated by pulse heating the body to a temperature within the region in which the semiconductor sheet resistivity decreases with increasing anneal temperature. Typically this comprises raising the body to 1000.degree. C. within 40 seconds or less in an inert atmosphere and allowing it to cool immediately or within approximately 30 seconds. The heating is so rapid that diffusion side effects are minimized. Pulse heating may be achieved by means of a sealable microwave heating chamber (1) which can be pressurized or vented as desired and into which microwave energy is directed for a predetermined time. The microwave heating can also be employed for other processing, particularly high pressure oxidation of silicon.

Abstract: For the generation of a vehicle reference speed to serve as the reference value for the control of brake slip and/or traction slip in automotive vehicles, the rotational behavior of the controlled wheels is measured. The vehicle reference speed is defined by virtue of the rotational behavior of the individual wheels by way of logic combining, selection according to predetermined criteria and/or comparison with predetermined limit values. The wheel rotational behavior of each wheel is evaluated in comparison to the wheel-related vehicle reference speed (V.sub.Ref) according to several predefined criteria is then classified into reference-defining periods. As a function of ascertained reference-defining period, a vehicle reference value (b.sub.fzg) related to the individual wheel is determined which, together with the wheel-related vehicle reference values of the other wheels, determines the vehicle reference speed.

Abstract: A hydraulic brake system for automotive vehicles with at least one load sensor (41) sensing the load condition of the vehicle and with at least one sensor (14, 15, 21, 22) associated wtih each vehicle axle for the detection of a braking parameter decisive for the braking operation. The measured values sensed are supplied to an electric evaluation circuit (18) which during a braking operation permanently computes suitable braking pressure values for the wheel brakes (3, 4) of the rear axle and delivers corresponding control signals to a braking pressure modulator (31, 53, 54). A braking force sensor (14, 15, 21, 22) is associated with at least one vehicle wheel (12, 13, 19, 20) of each vehicle axle.

Abstract: A hydraulic power booster, for the actuation of a master cylinder in an automotive vehicle brake system, in which a booster piston and a brake valve are essentially arranged in parallel with the booster piston. In dependence on the actuation force applied to the brake system, a hydraulic pressure may be developed in a booster chamber which is essentially defined by a pedal-operable piston rod and by the booster piston. In order to supply at least the required absorption volume to the brake actuating devices without considerable reaction force at the brake pedal, the piston rod may be supported at the booster housing, against an actuating force. The booster piston is positively connected with the piston rod so as to enable a limited relative displacement between the booster piston and the piston rod.

Abstract: A supply tank for supplying fluid to a tandem master brake cylinder of a motor vehicle. The tank has a bottom section and a top section which is not shown. The bottom section comprises a partition wall which separates the two chambers from each other, the partition wall being formed with a passage which is arranged approximately in the center of the bottom section. In each chamber, an outlet is configured at each end of the bottom section. From each outlet and along the partition wall toward the middle of the bottom section, there extends one pipe which has an opening respective at its free end. The openings are positioned below the minimum admissible fluid level. The purpose achieved by the configuration of the pipes within the supply tank is that the effect of an inclination of the supply tank does not impair the efficiency of the hydraulic fluid and that, consequently, the outlets are supplied with hydraulic fluid at all times and in any condition.

Abstract: The present invention starts from a vehicle hydraulic brake system comprising a master cylinder (2) actuatable by a hydraulic power booster (1) and containing a working chamber (12, 21), to which latter wheel brakes (36, 37, 38, 39) are connected by way of valves (40, 41) controllable by a slip control electronics. On control action, pressure fluid can be taken from the wheel brakes (36, 37, 38, 39) through the valves (40, 41) and can be replenished out of the presser chamber (5) of the hydraulic power booster (1) by way of the working chamber of the hydraulic power booster by way of the working chamber (12, 21). On communication of the working chamber (12, 21) with the pressure chamber (5) of the hydraulic power booster (1), simultaneously, a resetting sleeve (11) is pressurized in the brake's release direction which is penetrated by a master cylinder piston (10) and which serves to limit the stroke of the brake pedal (6).

Abstract: A hydraulic brake system with slip control for automotive vehicles, comprises a master cylinder (2) pressurizable by a hydraulic power booster (1), in which system valve members (39, 40, 43, 44, 47) are inserted between the master cylinder (2) and the wheel brakes (45, 46, 41, 42) connected thereto which serve to remove pressure fluid from the wheel brakes (41, 42, 45, 46). Pressure fluid taken from the wheel brakes (41, 42, 45, 46) is replenished out of the pressure chamber (6) of the hydraulic power booster (1). A stroke limitation of the brake pedal (7) is effected during slip control.

Abstract: A millimeter wave integrated circuit (MIC) includes both low power components and high power components, e.g. Gunn diodes, disposed on a common semi-insulating semi-conductor substrate. Each high power component is formed in an active epitaxial layer and is provided with a heat sink comprising a thermally conductive material deposited in an opening in the back of the substrate below the compound. The low power components are isolated by an implanted proton layer.

Abstract: There is disclosed a circuit arrangement comprising a microcomputer, wherein certain terminals of the microcomputer may be used as either input terminals or as output terminals under selective switching control so that a reasonably priced microcomputer with few terminals can be used to control complex functions such as those of a vehicle seat adjusting mechanism. The circuit arrangement also includes a program check arrangement wherein check pulses are superimposed with control signals at an output terminal. The check pulses are used by a multivibrator which resets the microcomputer when the check pulses are not periodic. The check pulses are short in duration and do not adversely affect the operation of a relay coupled to the output terminal.

Abstract: A three electron gun color picture tube includes phosphorescent marks attached to the rear side fo the shadow mask. These marks can be used for checking the exact position of the electron beams during adjustment.

Abstract: A vehicle hydraulic brake system with slip control, wherein a master cylinder (2) is pressurizable by a hydraulic poser booster (1). Valve means (23, 24, 29, 28, 32, 33, 34, 35) are inserted between the master cylinder (2) and the wheel brakes (25, 26, 30, 31) connected to the master cylinder (2), which valve means serve to remove pressure fluid from the wheel brakes (30, 31, 25, 26). Pressure fluid taken from the wheel brakes is replenished out of the pressure chamber (10) of the hydraulic power booster (1). A stroke limitation of the brake pedal (8) is effected during slip control. To simplify the design of the braking pressure generator (1, 2), the end surface of the master cylinder piston (5) close to the working chamber (16) is larger than the effective surface of the booster piston (4), and that a stepped piston is employed as master cylinder piston (5), an annular surface of said master cylinder piston (5) being adapted to be acted upon by the pressure prevailing in the working chamber (16).

Abstract: A device for monitoring the circumferential speed of a toothed disc (1) capable of being rotated, with a sensor (4) arranged at a defined distance (s) from the toothed rim (2) of the toothed disc (1) and with a sensor casing (7) supported at and securable to a stationay guide member. In order to avoid the need of any additional adjustment of the distance (s) in the event of remounting the sensor (4), a bushing (9) is provided as a guide member which is adapted to be fastened to a carrier element (14) by screw means and which projects into a bore (8) of the casing (7). To arrange a threaded bore (15) in the casing (7), the bore (15) is adapted to accommodate a screw (16) into contact with the bushing (9).

Abstract: A hydraulic brake system for automotive vehicles with a master brake cylinder (51) and with a hydraulic power booster (49) connected upstream of the master brake cylinder, in which a pressure medium pump (18) which may be driven by an electric motor (17) is used for providing an auxiliary hydraulic energy, the drive of which may be switched on by a pressure accumulator (1), on the one hand, and by a brake pedal contact (58), on the other hand, in the unbraked operation of the automotive vehicle the pressure accumulator (1) permanently being kept on a pressure level sufficient for an initial actuation of the brake and the charge of the pressure accumulator (1) being monitored by a pressure control valve (19).