Abstract: Interprocessor message communication synchronization apparatus and method for a plurality of processors connected to a system bus where one processor desiring to send a control signal to another processor, broadcasts an input/output write instruction on the system bus along with the address of the receiving processor and a data field representative of the control signal to be transmitted. Apparatus associated with the receiving processor includes a decoder that responds to the input/output write instruction to enable a register when the address transmitted on the bus matches its address. The enabled register receives the data signals from the bus to set therein the appropriate control signal represented by the data. The stages of the register are connected to the associated control signal inputs of the other processor. In this manner the one processor may transmit a message synchronizing interrupt to the other processor.

Abstract: A peripheral controller executes data transfer operations between a host computer and a multiple number of separate peripheral terminal units. A specialized buffer memory control system provides dedicated page-segments for each one of the peripheral terminal units to enable the peripheral controller to concurrently manage a multiple number of data transfer cycles in an optimum fashion in order to increase the through-put of the data transfer operations.

Abstract: A digital complex correlator for correlating in-phase and quadrature components of data samples by shearing the in-phase and quadrature data pairs by a predetermined multiple of the noise in the correlation window under analysis. The sheared data is multiplied by a variable factor generated in accordance with the shearing threshold and the number of samples in the window. The variable factor is generated to maximize the precision in the data while avoiding overflows in the complex multiplication and accumulation of the correlation process.

Abstract: A full bridge DC-DC series-resonant power converter is operated at a constant switching frequency using a phase delay between the transistor legs of the bridge to control the output voltage. All power semiconductor devices switch on and switch off at approximately zero volts while operating at a constant switching frequency which is above the resonant frequency of the resonant tank circuit. Zero-voltage switching increases the efficiency of the power converter and allows high frequency operation which minimizes component volumes. Constant frequency operation simplifies design of the magnetic components, confines the EMI spectrum to known frequencies and simplifies EMI design, and reduces the voltage and current excursions and thus reduces the peak component stress.

Abstract: The character displaying capacity of a monitor is enhanced by operating the pixel clock at a frequency at which beam narrowing occurs so that adjacent pixels are substantially distinct from each other. The operating clock frequency exceeds the bandwidth of the video channel and is at a frequency higher than the clock frequency at which pixel smearing occurs.

Abstract: An enclosed mini-plenum is inserted between printed circuit boards to direct cooling air of various amounts into selected areas of the printed circuit board. The mini-plenum provides orifices of varying sizes to direct amounts of cooling airflow to aligned heat sinks on the printed circuit board. Certain orifices may have raised foils or leaves which can further direct selected amounts of airflow through the orifices. This system provides specifically controlled amounts of cooling facilities to printed circuit board areas having different heat dissipation requirements.

Abstract: A coherent pseudonoise code (PN) tracking loop is provided with apparatus for sensing the absence of PN transition in the incoming data stream to the tracking loop and for switching OFF the data stream to prevent phase error distortion and inherent noise from entering the tracking loop which could be sensed as false or incorrect phase error signals. The apparatus includes a transition switch in the incoming data stream that is responsive to transition gate control logic coupled to the output of the PN replica generator in the tracking loop for switching OFF the incoming data stream when no PN transitions are occurring.

Abstract: A surface acoustic wave (SAW) radar doppler shift detection system is provided by transmitting a modulation signal having an up-chirp component followed by a downchirp component from a dispersive array SAW assembly to a target, and then receiving the radar return from the target by a receiver which also employs a similar dispersive array assembly. Dispersive array assemblies are constructed with two in line dispersive arrays. The dispersive arrays of the transmitter is positioned relative to two input SAW transducers and two output SAW transducers such that a pulse signal supplied to the two input transducers results in an expanded signal of the output transducers. The expanded signal acts as a modulation signal which is multiplied by an RF and transmitted. The receiving array assembly detects the radar return signal, and, after it is multiplied down to the SAW frequency, compresses it.

Abstract: A quick-set engaging and release spacer-connector assembly permits two cabinet modules to be fixedly connected side-by-side by manual operation of upper and lower internal lever handles which sit inside the assembly. A lateral drawing force operates to seal the cabinet modules with RFI/EMI gaskets on the periphery of each side of the spacer connector assembly.

Abstract: Enhanced density of electrical and/or mechanical interconnections between adjacent wafers within integrated circuit assemblies and structural integrity of those interconnections under temperature cycling conditions, is attained by utilizing laser assisted chemical vapor deposition to fabricate precisely configured metal posts which serve as such interconnections.

Abstract: A novel digital phase shifter is provided for accomplishing digital phase shifting without the requirement of complex multiplication. The phase shifter includes buffer registers for receiving and storing the inphase and quadrature components of a complex number and for storing in a phase command register the information indicative of the phase shift to be accomplished. The phase shifting apparatus comprises a command map for generating a plurality of plus or minus phase shift command bits. A plurality of plus or minus phase shift registers are coupled to the phase shift command bits for performing plus or minus phase shifts of predetermined angles that diminish by a factor of approximately one-half from the previous phase shift angle.

Abstract: A high-speed sample and hold phase detector for clock and data recovery systems is provided with a differentiating circuit coupled to a source of coded input data signals to provide bi-level differentiated output sampling pulses which are applied to a high-speed transformer. The output of the high-speed transformer is coupled to a high-speed fullwave diode bridge rectifying circuit whose output provides the error signal for the clock and data recovery circuit. The transformer is provided with a secondary winding having a center tap connected to a bi-level clock having clock signals whose rate is at twice the data rate. The D.C. error signal voltage amplitude is proportional to the phase difference between the clock signal connected to the center tap of the secondary winding of the transformer and the differentiated sampling pulses. The sampling pulses are employed to sample the clock signal which provides higher stability and enhances noise reduction.

Abstract: A novel apparatus for determining the relative hardness and abrasion resistance of industrial film coatings and linings is disclosed. In its preferred form, the apparatus comprises a rigid handle incorporating a pre-set angle between its flat lower surface and a flexible spring blade attached at one end to the handle, and a scoring stylus attached at the other end of the spring blade. By placing the bottom of the handle on the surface of the film coating or lining whose relative hardness and abrasion resistance is to be determined, the spring blade is caused to deflect and thereby exert a constant and predetermined force through the scoring stylus onto the film coating or lining. By drawing or pulling the handle across the surface of the film coating or lining while maintaining the lower surface of the handle in complete contact with the film coating or lining, the scoring stylus creates a scratch on the surface of the film coating or lining.

Abstract: Polyurethane and poly(urea)urethane compositions as specified below are utilized as luting agents, for filling cavities or spaces in human or other animal bones, and are introduced in liquid form and formed in situ to create a polyurethane or poly(urea)urethane elastomer which is relatively compatible with the surrounding tissue, has good adhesive properties, low friability, and good tear and tensile strength. The invention includes the polyurethane and poly(urea)urethane compositions disclosed and their uses in the performance of surgery in human beings and other animals. The polyurethane and poly-(urea)urethane compositions are produced by the reaction of an "A" component prepolymer which is the reaction product of a diiosocyanate with a diol or polyol, and a two element "B" component, which may be any of the polyols used in producing the "A" component prepolymer or a relatively short chain diol or triol or a diamine (in the case of a poly(urea)urethane) or combinations thereof.

Abstract: Polyurethane and poly(urea)urethane compositions as specified below are utilized as luting agents, for filling cavities or spaces in human or other animal bones, and are introduced in liquid form and formed in situ to create a polyurethane or poly(urea)urethane elastomer which is relatively compatible with the surrounding tissue, has good adhesive properties, low friability, and good tear and tensile strength. The invention includes the polyurethane and poly(urea)urethane compositions disclosed and their uses in the performance of surgery in human beings and other animals.

Abstract: A machine and process for removing adhesively fastened base cups from plastic bottles, comprising conveyor means for transporting said bottles and a pair of inwardly opposed extensible fingers, projecting at an angle of about 25.degree. to about 30.degree. upward from the vertical, to engage each base cup and separate it from the bottle. Optionally, the machine may include means to cut the bottle into sections for more remunerative scrap recovery.

Abstract: A process for geotechnic exploration comprising the steps of:(a) Emitting one or more brief electromagnetic pulses or waves from an airborne platform at regular intervals based on the airspeed of the platform and the area being surveyed;(b) The wavelengths, frequencies and cyclicity of the waves being selected to provide, upon reflection, satisfactory indicia of the physical characteristics of the area being measured;(c) Receiving the reflections of said waves at said platform;(d) Amplifying said reflected waves to a readily processable level;(e) Processing said waves to enhance the spatial resolution of images produced therefrom;(f) Further processing said waves by selecting those variables represented by the waves that are deemed relevant;(g) Displaying said waves in visual form representing a cross-section of an area;(h) If desired, storing in recoverable form the signals representing said variables; and(i) Repeating said process as often as desired.

Abstract: Solventless compositions for preparing sprayable polyurethanes and poly(urea)urethanes by spraying a mixture of:(a) An isocyanate-terminated prepolymer or quasi-prepolymer; and(b) A curing agent comprising a relatively highly reactive polyol or polyamine or combination thereof and at least about 20% by weight of a reactive "filler" comprising a polyol having an equivalent weight in the range from about 300 to about 2,000.

Abstract: Apparatus for sterilizing laboratory and hospital glassware, liquids, instruments, garments and the like comprising a sterilizer enclosure having a steam jacket surrounding the same, a source of steam and means, connected in parallel, to supply steam to said jacket at one of two predetermined pressures, means for interconnecting said jacket and said interior of said sterilizer, and means responsive to a predetermined temperature setting for the interior of the sterilizer to selectively initiate and discontinue the supply of steam to said jacket in response to the temperature in said sterilizer.

Abstract: Process for recovering high-grade blast furnace iron or other metal from pieces of blast furnace iron or such other metal and blast furnace slag having large amounts of such blast furnace slag, by tumbling a substantial number of such pieces to achieve a constant redistribution thereof while impacting at least a substantial portion of such pieces with a high velocity, relatively small diameter shot or grit which has a hardness which is greater than the hardness of the slag, thereby abrading the impurity, while leaving the body of non-impurity substantially intact.