effects of material properties and crush conditions of the crush energy absorption of fiber composite rods

crushing along the fiber axis of unidirectional e-glass fiber composite rods was examined to determine the effects of fiber volume fraction, fiber diameter, matrix compressive yield strength, crush rate, fiber surface treatment, and crush plate geometry. the volume specific energy absorption was found to increase with fiber content, fiber..

thermal fatigue resistance of a carbon-carbon composite

thermal fatigue resistance of carbon-carbon composites with three different fiber surface treatments is studied in thermal cycles between 100 degrees c and 1700 degrees c up to a number of cycles of 100 in free and restricted expansion conditions. the effects of thermal cycles were studied by sem paying attention especially to structural ..

preparation and characterization of aln substrates for metal and dielectric film deposition

reports on material characterization and processing steps required for the successful deposition of metallic and low dielectric constant films of high adhesion strength on high thermal conductivity aluminium nitride substrates for use in multichip microelectronic fabrication

colorimetric activity assays of enzyme-modified mir fibers

the object of this investigation is the determination of the activity of enzymes, for instance, glucose oxidase (gox), immobilized on chalcogenide and silver halide fiber surfaces. after different ways of chemical modification of the fiber surfaces, two different silanes, 3-aminopropyltriethoxysilane (3-apts) and gamma -glycidoxypropyltri..

a fiber-optic enzyme sensor for the determination of adenosine diphosphate using internal analyte recycling

an optical multienzyme biosensor for the sensitive determination of adenosine diphosphate (adp) is presented hexokinase, pyruvate kinase, and glucose-6-phosphate dehydrogenase are coimmobilized in a polyurethane membrane and fixed to a commercial fiber-optic probe. adp is continuously phosphorylated/dephosphorylated in a cycle catalyzed b..

fabrication and evaluation of conducting polymer composites as radar absorbers

conducting polymer materials have the potential for replacing metals in many electromagnetic shielding applications where the special properties of plastics and their composites are preferred to those of metals and other inorganic conductors such as carbon. there is also the whole field of radar signature management where there is a requi..

preparation and properties of thin film yba/sub 2/cu/sub 3/o/sub x/ devices

low-noise yba/sub 2/cu/sub 3/o/sub x/ dc squids and flux transformers were fabricated by laser deposition. the josephson junctions were of grain boundary type, formed by epitaxial thin films, covering ar/sup +/ ion milled step edge substrates. the 5 mu m wide dc squids were patterned by a sio inhibit technique. the squid hole was varied b..

analysis of beam distortion during hot dip galvanising

hot dip galvanising is an effective method for protecting steel fabrications against corrosion. however, large temperature gradients generated in fabrications, coupled with the release of internal residual stresses, can cause severe distortion during galvanising. this paper describes an investigation into the nature of distortion in beams..

plasma surface modification of advanced organic fibres iv evidence of chemical bonding between epoxy resins and fibre surface amine groups. (xps)

the authors' study has demonstrated that, under conditions similar to those used in fabricating aramid/epoxy and ecpe/epoxy composites, and using a functionally equivalent epoxy resin, surface amine groups on aramid and ecpe fibres react chemically with an epoxy resin. this result provides strong evidence that the increases in interlamina..

high performance thin film devices on metallized beryllia tape substrates

modern production of thin film metallized devices requires thin, large area substrates with a highly smooth 'as fired' surface these properties are found in a new family of beryllia substrates produced by tape casting. flat substrates as large as 15*15 cm with a maximum thickness of 0.10 cm and with a surface finish of less than 0.13 mu m..