electron beam induced current studies of ms and mis devices on cds

schottky diodes, prepared by depositing gold onto single crystal cds subjected to a variety of surface treatments, are investigated. devices fabricated on surfaces which are mechanically polished exhibit features associated with localised defects, where the contrast reverses with change in polarity of the applied bias this behavior resemb..

studies on chitin - 6. preparation and properties of alkyl-chitin fibers

in the reported experiments, alkali-chitin was prepared by a simple procedure which includes a freezing process in a sodium hydroxide-sodium dodecylsulfate system. its alkylations were achieved with various alkyl halides of different chain lengths and bulkiness. the affinity toward water or formic acid was remarkably enhanced by the alkyl..

theoretical study of continuous nad recycling by conjugated enzymes immobilized in ultrafiltration hollow fiber

the stedy-state solution of continuos conjugated enzyme rections was theoretically obtained by application of the theorell-chance reaction mechanism for the system of alcohol dehydrogenase and lactate dehydrogenase immobilized in an ultrafiltration hollow-fiber tube. the reactor was a dialyzer of complete mixing type. the coenzyme, nad, w..

niektore kierunki zastosowania chityny i jej pochodnych w technologiach wlokien chemicznych i tworzyw sztucznych. $left bracket$ applications of chitin and its derivatives in the technology of chemical fibres and plastics $right bracket$

some important trends of application of chitin and its derivatives in the technology of chemical fibers and plastics have been reviewed. in poland, chitin and its deacetylated derivative - chitosan - are obtained as by-products of antarctic crustacean processing. chitin and its derivatives can be used as a raw material for films and fiber..

laser surface finish gauge

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

effects of enzymes and gamma irradiation on the tensile strength and morphology of poly(p-dioxanone) fibers

the objective of this study was to examine how and to what extent a new degradable polymeric fiber, poly(p-dioxanone), used as a surgical suture material, degrades in the presence of enzymes and after $gamma$ irradiation. the degradation of the fiber was studied mechanically and morphologically. both esterase and trypsin enzymes and their..

ir-ft spectroscopic study of surface structure of quartz fiber

the spectra of original and modified quartz fibers with specific surface areas of 1-5 m**2/g have been measured. the position and intensity of the absorption bands of molecularly adsorbed water (3420 cm** $minus$ **1) and silanol groups in the fine pores (3650 cm** $minus$ **1) are changed by chemical modification, vacuum-thermal treatmen..

austenitische cr-ni-staehle erfordern eine spezielle behandlung bei ihrer verarbeitung. $left bracket$ austenitic cr-ni steels require special treatment in their fabrication $right bracket$

failure to give careful consideration to the specific properties of high-alloy steels can result in major losses. special cases are described to show avoidaable errors in the production, storage, fabrication of components and structures (involving welding, forming and surface treatment), and testing of austenitic cr-ni steels. (edited aut..

gewinnung und charakterisierung von nichtkeratinarmer wolle - ein modellpraeparat fuer die grundlagenerforschung von textilchemischen ausruestungsprozessen. $left bracket$ production and characterization of keratin-free wool: a pilot study for fundament

the nonkeratinous proteins of wool can be partly or completely dissolved by controlled enzymatic digestion. a comparison between the keratose content of intact wool and that of wool which has been hydrolysed for 96 h with pronase confirms that specifically all the nonkeratinous components are dissolved out of the wool composite by pronase..

techniques for the analysis of crosslinked polymers

the components of the biological environment responsible for polymer degradation, namely, water, salts and enzymes are discussed the degradation of collagenous fibers and polyester implants are examined in detail. the degradation of polyurethanes, polyamides, polyorganosiloxanes and polyolefins are discussed. the biological stability of p..