metal evaporated tape for high band 8mm video system

the authors have developed a metal evaporated (me) tape for use with the high-band 8-mm video system. compared to conventional metal particle tape, the me tape has significantly improved electromagnetic characteristics, with video output of $plus$ 5 db and video carrier-to-noise ratio of $plus$ 5 db. its overall reliability equals that of..

proceedings of the symposium on carbon fibers and composites

this issue of the journal contains papers presented at a conference. some of the subjects covered are pan-based carbon fibers, melt spinning, interfaces, morphology, laminate design, carbon-carbon composites, oxidation protection, carbon-cement composites, acid treatment, vapor growth, and surface treatment. all papers are separately inde..

plasma-enhanced cvd of high quality insulating films

a modified plasma-enhanced chemical vapor deposition process (he-pecvd) is described, and used to deposit high quality silicon-based insulators at low substrate temperatures. this process utilizes very high levels of helium dilution of the reactive gases to eliminate many of the problems normally associated with plasma deposition. sio//2 ..

novel electroluminescent molecular diode. a quantum electronic model of bioluminescence

voltage-current characteristics of the firefly photuris vermontica luminescent luciferin enzyme-catalyzed system (lecs) were obtained. from these measurements, a quantum electronic model was developed for calculating the activation energy (or energy gap) between the lecs electron donor-acceptor energy levels in its excited states. using t..

chitaline materials. soluble chitosan-polyaniline copolymers and their conductive doped forms

graft copolymers of polyaniline and chitosan have been synthesized. they are soluble in aqueous solution and form self-supporting materials, including thick films and fibers. upon protonic doping, their conductivities rise from less than $approximately equals$ 10** $minus$ **7 s/cm to the 10** $minus$ **2 to 10** $minus$ **5 s/cm range, d..

immobilized enzyme cellulose hollow fibers. iii. physical properties in vitro biocompatibility

the initial testing of the safety of a cellulose-heparinase hollow fiber device was assessed with respect to physical properties and in vitro biocompatibility. the material cleared urea and creatinine without passing albumin, even at high flow rates. the clearance of urea and creatinine by cellulose-heparinase was equal or slightly reduce..

immobilized enzyme cellulose hollow fibers. ii. kinetic analysis

immobilized enzyme hollow fibers may be useful in the purification or treatment of whole blood under clinical conditions in this study, catalytically pure heparinase was immobilized to cellulose to analyze the feasibility for the removal of heparin's anticoagulant activity from whole blood. the kinetics of catalytically pure heparinase im..

immobilized enzyme cellulose hollow fibers. i. immobilization of heparinase

the immobilization of heparinase to tresyl-chloride-activated cellulose hollow fibers for the removal of heparin from the bloodstream was examined. whole blood can be circulated through cellulose hollow fibers without hemolysis and the tresyl chloride chemistry provides a strong linkage which limits the release of the enzyme from the supp..

use of surface signal enhancement techniques in x-ray photoelectronic studies of carbon fibre surfaces

there have been many studies of the chemical changes induced by oxidative treatments of carbon fibre surfaces attempt to understand the nature of fibre/matrix interactions in carbon fibre/epoxy composites. however, there are conflicting reports on the amount and type of oxygen and nitrogen functionality induced by similar surface treatmen..

mechanical behaviour of carbon-carbon composites made with surface treated carbon fibers

unidirectional carbon-carbon composites have been made with type i carbon fibers surface treated with hno//3 for different durations, and phenolic, polyfurfuryl alcohol, and coal tar pitch as matrix precursors. fiber-matrix bonding in polymer composities influences pyrolysis shrinkage, macrostructure, flexural strength, and fracture behav..