penetration of 5- mu chrysotile asbestos fibers through dupont tyvek 1422a and kimberly-clark cpf fabrics

aerosols of 4.1- mu mass median aerodynamic diameter chrysotile asbestos fibers were generated and passed through stitched (seamed) and unstitched (unseamed) dupont tyvek 1422a and kimberly-clark composite polypropylene fabric (cpf) spunbonded fabrics. the two unstitched fabrics and the two stitched fabrics were penetrated by amounts of c..

a study to evaluate strategies for improving the competitiveness in the world market place of the u.s. men's apparel industry

the study was initiated to investigate the use of edge sealants for the prevention of fraying as an alternative to serging and how it may be introduced to the tailored men's wear sector of the apparel industry. the experiments reported here were set up to duplicate the techniques used in manufacturing used to apply sealants. some recommen..

proceedings of the national workshop on substitutes for asbestos held at arlington, va., on july 14-16, 1980,

the purpose of the national workshop on substitutes for asbestos was to obtain more information on the technical and economic feasibility and possible health problems of substitutes for asbestos, for use in considering regulation of asbestos. some of the topics discussed include: non-asbestos friction materials; discussion on friction pro..

tools used for hand deburring

this guide is designed to help in quick identification of those tools most commonly used to deburr hand size or smaller parts photographs and textual descriptions are used to provide rapid yet detailed information. the data presented include the bendix kansas city division coded tool number, tool description, tool crib in which the tool c..

training manual for precision hand deburring, part 3

this publication is part 3 of a 4 part training manual to be used by machinist trainees, production workers, and others removing burrs from precision miniature parts. the manuals are written to be self-teaching and are intended to be used with two hours of training each day along with six additional hours of bench work in deburring this p..

deburring: technical capabilities and cost-effective approaches lessons 1 and 2

this two-lesson text on deburring provides engineers and production supervisors with an overall understanding of deburring economics and capabilities. the subject matter includes economics, side effects, process selection techniques, product design influences, standards, plant-wide approaches, and burr formation and prevention. deburring ..

training manual for precision hand deburring, part 2

part 2 is presented of a 4-part training manual to be used by machinist trainees, production workers, and others removing burrs from precision miniature parts. the manuals are written to be self-teaching and are intended to be used with two hours of training each day along with another six hours of bench work in deburring (era citation 06..

high concentration silicon photovoltaic cell development

the objective of this study is to develope practical semiconductor photocells: 1) for use is high concentration system (at leat 25 suns at air-mass-one), 2) having 18 or more efficiency, 3) using state-of-the-art silicon material and device technology, and 4) amenable to low cost photovoltaic production of electrical energy from solar rad..

industrial hygiene report perchloroethylene at b and b cleaners, chicago, illinois on july 17, 1979,

an industrial hygiene survey to study the effect of perchloroethylene (127184) (pce) exposure on workers at b and b cleaners (sic-7216) in chicago, illinois on july 17, 1979 was presented. during 328 minutes of dry cleaning the time weighted average exposures to pce of the dry cleaner/spotter and presser were 24 and 6.7 parts per million ..

photovoltaic mechanisms in polycrystalline thin film silicon solar cells. eighth month technical summary report, july 31, 1979-march 31, 1980

the objective of this program is to understand fundamental aspects of grain boundary influences on photocurrent collection and opposing current transport in polycrystalline silicon cells. results of the program are expected to aid in optimizing thin film polycrystalline silicon solar cells. three major tasks are addressed in this program,..