electrochemical machining of automatic gun barrels

a 17-month program was conducted to develop an electrochemical machining process for rifling 25mm, 7-foot-long gun barrels with gain twist rifling. using a stationary electrode approach, a process and appropriate tooling and operating parameters were developed and demonstrated by rifling two barrels each of 4340 steel, pyromet x-15 and cg..

establishment of engineering design data for hybrid steel/ceramic ball bearings

a hybrid steel/ceramic angular contact ball bearing was designed for optimum performance at 2.5 x 10 to the 6th power dn. a lot of bearings was fabricated to this design and life tests were conducted under two different loads. a detailed failure anlaysis was completed to define the causes for the premature silicon nitride ball failures (a..

development and testing of techniques for increasing the conspicuity of motorcycles and motorcycle drivers

the project was initiated to determine whether it might be possible to reduce the incidence of multi-vehicle motorcycle crashes by improving the conspicuity of the motorcycle-driver unit specifically, the following tasks were carried out: (1) a review of motorcycle accident data; (2) development of potential conspicuity treatments; (3) fi..

evaluation of hyperfiltration for separation of toxic substances in textile process water

the report gives results of an evaluation of hyperfiltration for separation of toxic substances in textile process water. three membranes (cellulose acetate, polyether/amide, and dynamic zirconium oxide/polyacrylic acid) were used to separate process water from scour and dye operations into permeate and concentrated streams feed, permeate..

novel fabric containing microcapsules of chemical decontaminants encapsulated within semipermeable polymers

the invention concerns novel clothing fabrics containing microcapsules in a resin finish comprising reactive chemical decontamination agents encapsulated within a semipermeable polymer which is selectively permeable to toxic chemical agents but impermeable to the decontamination agents, thereby allowing the toxic chemicals to diffuse into..

interpretation of environmental assessment data

the report describes preliminary attempts to formulate viable models for interpreting environmental assessment data. the models are evaluated using data from the four most comprehensive environmental assessments. a format for entering environmental assessment results on fortran computer sheets is presented and more complete data entry she..

semiautomatic weld crown contouring equipment. final report

pipe welds in nuclear plants are presently finished by tedious hand grinding for ultrasonic testing. a study has now been completed demonstrating that a semiautomatic machine for finishing weld crowns is quite feasible. such a machine could produce more consistent contours than hand finishing as well as improved surface finishes; also it ..

investigation of proposed process sequence for the array automated assembly task, phase 2. / low cost silicon solar array fabrication

the technological readiness of the proposed process sequence was reviewed. process steps evaluated include: (1) plasma etching to establish a standard surface; (2) forming junctions by diffusion from an n-type polymeric spray-on source; (3) forming a p+ back contact by firing a screen printed aluminum paste; (4) forming screen printed fro..

environmental readiness document: industrial programs, fy 1980

nine technologies under development are discussed. they are: heat pump grain dryer, blended cement, acetylene from coal,polypropylene waste to fuel oil, foam-dying textiles, microwave/vacuum drying, fuel-saving paint plant, new fertilizer process, and high-performance forge furnace. each is discussed from the standpoint of the technology,..

an investigation of the influence of endotoxins on myoplasmic atpmg and sodium efflux in barnacle muscle fibers

the original goal of the present work was to investigate the possibility that endotoxins may act by inactivating the adenine nucleotide translocase system. this approach however to the problem of how endotoxins act had to be abandoned in view of evidence that barnacle muscle fibers have large phosphagen reserves e.g. an arp content of *ap..