progress in the battle with the burr

although us industry still spends more for removing burrs than it needs to, significant improvements in deburring are developing standards for burrs are now in reasonably common use at many companies. the mechanisms by which burrs form and by which one can predict their properties have been documented, and some deburring economics have be..

graphite fiber surface analysis by x-ray photoelectron spectroscopy and polar/dispersive free energy analysis,

graphite fibers of less than 10 microns in diameter are used as the reinforcing agents in structural epoxy matrix composite materials their efficiency in reinforcing is determined to a large degree by their degree of bonding to the epoxy. commercial surface treatments maximize this adhesion without quantifying the interaction. the purpose..

the structure of an aminosilane coupling agent in aqueous solutions and partially cured solids

the molecular structures of partially cured polyaminopropylsilsesquioxane and aminopropyltriethoxysilane in water have been studies using fourier transform infrared, laser raman and quasielastic laser light scattering spectroscopy. we propose a multiple hydrogen-bonded structure for the intramolecularly interacting amine and silanol group..

charged-particle coating

advanced target designs require thicker (approx. 300 mu m) coatings and better surface finishes that can be produced with current coating techniques. an advanced coating technique is proposed to provide maximum control of the coating flux and optimum manipulation of the shell during processing. in this scheme a small beam of ions or parti..

effect of high-moisture environments on printed-wiring-board insulation

the use of high impedance circuitry and narrow conductor separations in current designs is generating increasing concern for the insulation resistance between conductive elements especially those used in high moisture environments. this concern is multiplied by the expanding use of electronic devices in a greater variety of environments a..

visual thread quality for precision miniature mechanisms

threaded features have eight visual appearance factors which can affect their function in precision miniature mechanisms. the bendix practice in deburring, finishing, and accepting these conditions on miniature threads is described as is their impact in assemblies of precision miniature electromechanical assemblies. (era citation 06: 0206..

precision machining commercialization

to accelerate precision machining development so as to realize more of the potential savings within the next few years of known dod part procurement, the air force materials laboratory is sponsoring the precision machining commercialization project (pmc). the goal of pmc is to minimize precision machining development time and cost risk fo..

effects of francisella tularensis, salmonella typhimurium and streptococcus pneumoniae infections on oxidative, glycolytic and lysosomal enzyme activity in red and white skeletal muscle in the rat,

since opinions differ as to whether the oxidative and glycolytic capabilities of skeletal muscle are altered in acute infection, the activities of two oxidative and one glycolytic enzyme were determined in homogenates of skeletal muscle of rats. groups were inoculated with francisella tularensis 72 h prior to study or with salmonella typh..

study for fabrication, evaluation, and testing of monolayer woven type materials for space suit insulation

an alternative space suit insulation concept using a monolayer woven pile material is discussed. the material reduces cost and improves the durability of the overgarment, while providing protection similar to that provided by multilayer insulation (mli). twelve samples of different configurations were fabricated and tested for compressibi..

research of microstructurally developed toughening mechanisms in ceramics. part 4. fabrication, fracture toughness and strength of al2o3/zro2 composites

three al2o3/zro2 composite series, containing o, 2 and 7.5 mole y2o3, were fabricated for fracture toughness determinations. without y2o3 additions, 2 m/o y2o3 allowed full retention up to 60 v/o zro2 cubic zro2 was produced with additions of 7.5 m/o y2o3. significant toughening and strengthening was achieved when tetragonal zro2 was pres..