Abstract: A method of computer aided design of coarse grain FPGA's by employing a library of selected primitive cells, defining the connection classes useful in the FPGA design, and assigning appropriate connection classes to the inputs and outputs of the respective primitive cells. The primitive cells and defined interconnections used therein have accurately established timing and power parameters thereby enabling more accurate assessments of static timing and power consumption for the entire FPGA design. Moreover, the method of the present invention results in placement directives which then serve as connection criteria in carrying out subsequent place and route algorithms. One such placement directive is implemented as a "local output" (LO) of some of the primitive cells which implies that that particular output must be connected to another primitive cell input within the local configurable logic block (CLB). Another such placement directive is obtained by using a plurality of virtual buffers.

Abstract: A method for continuously manufacturing in air aluminum matrix composites reinforced with a plurality of parallel layers of unidirectional filaments comprising positioning a plurality of filament reinforced aluminum matrix monolayer tapes in a stack, placing the stack between platens heated to a predetermined temperature, pressing the stack between the platens at pressures of approximately 100-10,000 psi to reduce its thickness to cause densification, said temperature being lower than the liquidus temperature of the aluminum matrix but being sufficiently high, in combination with the pressure, to cause bonding of said matrix to said filaments and to contiguous portions of adjacent tapes and removing the densified composite from between the platens.

Abstract: Apparatus for and method of friction welding two metal workpieces under a relative rotation, being characterized in that two workpieces of metal are welded together with a certain particular phase angle therebetween, and especially in that said particular phase relation is accomplished, without stopping once or discontinuing said relative rotation to adjust said phase angle, by providing an alternative rotating means which is driven independently from rotating means and selectively engageable with said proper rotating means.

Abstract: Heat transfer tubes are provided internally with extended surfaces to improve heat transfer between a fluid within the tube and a fluid outside of and in contact with the tube. A flat sheet of metal is provided with extended surfaces which are welded to one side of the sheet, so that a tube with internal extended surfaces can be formed by bending the sheet so that it envelopes the surfaces and welding sides of the sheets together.

Abstract: Disclosed herein is an improved method for joining diamond to metal using a gold-tantalum or gold-niobium solder. The method utilizes powdered material, and a clamp to keep the diamond in place during the soldering step. The article produces has higher mechanical stability than articles produced by known procedures.

Abstract: A guide useful in welding large objects such as offshore oil rig support structures, is described as having a guide jacket with appropriate openings for the positioning of jacks and their support structures.