mm&&t manufacturing methods for gradient furnace processing of ceramic armor and structural ceramics

the growth of large single crystal materials opens up many possibilities for new applications of ceramics, such as in the case of transparent armor, lasers, and laser windows. single crystals of sapphire have been made by many techniques, the best known probably being the verneuil method for the production of jewels and bearings until rec..

improving the removal of lint from cottonseed

this invention relates to wet chemical processing of cotton prior to ginning. the removal of lint fibers from the cottonseed is facilitated by aqueous pretreatments of the cotton boll with dilute chemical substances. the wet processing of the boll renders the lint amenable to easy removal from the seedcoat in the wet or dry states

ceramic turbine components research and development. part 1. ceramic rotor-blade development. final report

the principal objective of this program was to develop (through design, analysis and laboratory spin testing) the design techniques for uncooled ceramic rotor blades. present-day materials, fabrication techniques and system operating conditions were assumed in the program. the unique compound curvature dovetail attachment concept was gene..

study of growth conditions and electronic properties of double heterojunctions prepared in the vapor phase for optoelectronic applications le fibrage et les caracteristiques mecaniques des pieces forgees

the process taking place is defined and examples of typical manifestations are given. better behavior and longer lifetimes can be obtained by optimizing grain or fiber structure characteristics. it is particularly important to ensure that the fins of joints are positioned outside stress zones. the skin of the part in question must not be ..

new developments in irradiation treatments

various processes using ionizing radiations are used in industry and allow the commercialization of many products made of polymers, the properties of which were modified by irradiation. those modifications are made to remove a drawback of a polymer or to bring the improvement of one or several new properties. by grafting it is mainly poss..

black chrome solar selective coating

electrodeposited black chrome solar selective coatings have frequently experienced thermal stability problems when heated to temperatures above 250 exp 0 c (480 exp 0 f) in air. by reducing the trivalent chromium concentration in the standard black chrome plating bath, coatings on nickel substrates are obtained which are stable for thousa..

body armor for women

a contoured, all-fabric, lightweight, body armor garment for the protection of the torso of a woman against small arms missiles and spall comprises a contoured front protective armor panel composed of a plurality of superposed layers of ballistically protective piles of fabric made of aramid polymer yarns, the front protective armor panel..

the effects of catheptic enzymes on muscle proteins,

this work gives biochemical, ultrastructural and technological evidence for the use of spleen enzymes (cathepsins) as exogenous tenderizing agents. the extraction of the active enzyme fraction is shown. the release of the catheptic enzymes from the lysosomes occurs when the ph is lowered to 3.5. the subsequent lyophilate is rehydrated pri..

laser surface finish gauge

a laser surface finish gauge has been developed to measure the roughness of the entire inside surface of hemishells in the range of 4 to 10 microinches roughness average (ra). standards have been fabricated that allow for traceability of the gauge's measurements to the national bureau of standards. the gauge employs the principles of angu..

the development of an elastic reverse gradient garment to be used as a countermeasure for cardiovascular deconditioning

using a new nomex lycra elastic fabric and individualized garment engineering techniques, reverse gradient garments (rgg's) were designed, constructed, and tested for effectiveness as a countermeasure against cardiovascular deconditioning. by combining torso compensated positive pressure breathing with a distally diminishing gradient of c..