computer landscapes

computer artists share a common problem' once they have created an expressive composition, how do they turn it into a finished work of art{ for most artists, it isn't enough to generate an interesting image that can only be seen on a computer screen. to turn computer-generated art into a physical reality, you could use serigraphy, the fin..

new developments in the technology of seals

describes developments by the uk firm dowty seals. one is a new type of single-piece, double action piston head for pneumatic operating devices, consisting of nitrile rubber rings moulded on to a steel or light alloy insertion by which the head is attached to the piston rod. it can be used at pressures up to 20 bar and temperatures of 100..

say it with silk} (computerized silkscreening)

a pascal listing is given which produces a contour map in eight grey levels on a c itoh 8510 printer. a function of two variables (x and y) is entered in function tone. the resulting z is graphed as a variable darkness. the ranges of x and y are specified in the respective input statements as is the number of print columns desired. the ra..

designing for manufacturability overview (pcb design)

the paper is intended to held printed circuit designers understand manufacturing tolerances and how they apply to their designs. the topics discussed include' board size, outline drawing, multilayer board lay-up, impedance specification, plating, solder mask, silk screen, and electric testing

pulsed free jet expansion system for high-resolution fluorescence spectroscopy of capillary gas chromatographic effluents

a method for detection of capillary gas chromatographic (c-gc) effluent using supersonic jet spectroscopy is described. a novel concept is introduced which overcomes four major obstacles' high temperature of the gc: low gc flow rate: low dead volume requirement: and duty factor mismatch to a pulsed laser. the effluent from the c-gc flows ..

optimising automatic insertion

the efficiency of an automatic insertion machine depends on the quality of its programs. as boards become more complex, the ability of a human operator to generate a satisfactory program diminishes rapidly since it becomes impossible to predict events more than a few steps ahead. computer aided programming is the obvious step but many int..

polymer thick film pastes

the processes of producing polymers and silk screen printing are described in some detail. the emphasis is on the effects of the manufacturing process on electrical parameters in the end product the effects of different temperatures and cooling rates are shown various applications of polymer thick films are described and possibilities of ..

thick films fabricated by the sol-gel method for microionic and microelectronic devices

for microionic applications, superionic conductors have been fabricated in the form of thick films, using silk-screen printable powders. na/sub 3/zr/sub 2/si/sub 2/po/sub 12/, na/sub 3.1/zr/sub 1.55/si/sub 2.3/p/sub 0.7/o/sub 11/, li/sub 0.8/zr/sub 1.8/ta/sub 0.2/(po/sub 4/)/sub 3/, lialsio/sub 4/ and lialsi/sub 2/o/sub 6/ compositions ar..

an evaluation of manoeuvre detector algorithms

presents a review of the literature on manoeuvre detector algorithms for application to target tracking. the algorithms that are described are applicable to the tracking of aircraft, ships, and missiles by both track-while-scan and continuous tracking radars. a brief mention is made of the use of doppler information in target tracking. fi..

an overview of solder paste application equipment, techniques

solder paste dispensing can be done while 'stepping over' components already fixed in place. additionally, by using multiple-nozzle arrays, the paste can be applied on different planes at the same time, or at process points most convenient to the manufacturing process. the configuration of dot patterns deposited by multiple nozzle arrays ..