use of a fiber optic displacement probe as a surface finish sensor

a series of tests is described that correlates the output of a fiber optic-based displacement sensor with the surface finish and material characteristics of a variety of targets. nickel-plated targets with a range of surface finishes were examined, and the corresponding sensor sensitivities computed. for common machining processes, the se..

gm200 apvs and their use of composites

technological advances such as faster processing times and smoother surface finishes have extended uses of sheet molded composites into the oldsmobile, pontiac, and buick versions of the gm200 all-purpose vehicle. the sheet molded composites consist of a mixture of resin, chopped fiberglass and filler material. to minimize the number of s..

immobilization of biocatalysts with poly(vinyl alcohol) supports

two polymer materials, poly(vinyl alcohol) (pva) superfine fibers and photocrosslinkable pva bearing styrylpyridinium groups, have been developed to immobilize biocatalysts. the former has a large surface consisting of relatively large-size pores and the fibers can immobilize a large amount of biocatalyst on their surface by ionic interac..

surface-modified polysulfone hollow fibers. ii. fibers having ch//2ch//2ch//2so//3** $minus$ segments and immersed in hcl solution

polysulfone ultrafiltration hollow fibers were chemically modified on the surfaces with propane sultone and sncl//4, and immersed in hcl solution subsequently. the immersion of the fibers in hcl solution yielded lower molecular weight cutoff of the fibers than those without the immersion. the modified fibers with the propane sultone showe..

surface modification of aramid fibres

the surface of poly-p-phenylene terephthalamide fibres was chemically modified using oxalylchloride to obtain an intermediate on which various secondary reactions were performed. the adhesion to epoxy resins, as measured by multifilament pull-out tests, was markedly improved (by up to 70) by this treatment and fibre properties were not af..

flexural properties and dynamic mechanical properties of glass fibre-epoxy composites

the viscoelastic behaviour of glass fibre (gf)-epoxy composites was studied by flexural tests and dynamic mechanical measurements the influence of surface treatment on viscoelastic behaviour was also examined. using the results of flexural tests under a variety of constant temperatures and strain rates, master curves of flexural strength ..

enzymatic acylglycerol synthesis in a membrane bioreactor

lipases can catalyze the esterification reaction in a two-phase system. the candida rugosa lipase-catalyzed esterification of decanoic acid with glycerol is described in this work for an emulsion system and for a hydrophilic membrane bioreactor. the enzymatic activity is studied in relation to the interface area between the two phases, th..

biodegradable film derived from chitosan and homogenized cellulose

a novel composite film derived from chitosan and fine cellulosic fiber has been developed. its general characteristics are discussed. the composite film obtained by cast drying is hydrophilic but insoluble in water. it has a high oxygen-gas barrier capacity the strength of the composite film changes with chitosan content, and the maximum ..

magnetic resonance of polymers at surfaces

a brief review of the use of magnetic resonance of polymer molecules attached to or near solid surfaces is given with examples from the author's laboratory. liquid, solid (including wide-line and magic angle spinning) and two dimensional magnetic resonance experiments have all been performed on surface polymers. the results suggest how ma..

disposable oxygen electrodes fabricated by semiconductor techniques and their application to biosensors

we fabricated a miniature clark-type oxygen electrode using semiconductor techniques. the oxygen electrode features v-grooves to contain a 0.1 m kcl electrolyte impregnated in a gel, and a directly formed gas-permeable membrane over the gel. a fast response and a good linearity from zero oxygen concentration to saturation was obtained usi..