strain dependences of the first- and second-order raman spectra of carbon fibres

in this work the strain dependences of the first-and second-order raman spectra of high modulus (399gpa) apollo carbon fibres with 0x and 1x oxidative surface treatments have been studied the spectra were taken with 15mw of the 488 nm line of an ar laser the high value for the strain dependence of the second-order raman band, a $minus$ 24..

characterization and role of an elastomeric interphase on carbon fibers reinforcing an epoxy matrix

oxidized carbon fibers were coated using an on-line filament winding process with an elastomeric adduct crosslinkable and compatible with an epoxy matrix. the coating and modifications of the epoxy network were studied by dynamic mechanical measurements assuming that apparent activation energies of the secondary relaxation $beta$ //e of t..

preprints for the 114th isij meeting

this issue of the journal contains 44 papers presented at a meeting. the papers are arranged in the following groups: ironmaking; steelmaking; shaping and fabrication; instrumentation and control; chemical analysis; surface treatment; products and properties; and new materials and new processing. all papers are abstracted separately. tech..

approach to maceration mechanism in enzymatic pulping of bast fibers by alkalophilic pectinolytic enzymes produced by erwinia species

tissue maceration was generally elucidated by the action of endopolygalacturonase and endo-pectate or -pectin lyase (endo-pal or -pnl). in a process of screening of erwinia and pseudomonas strains for enzymatic pulping of pectocellulosic bast fibers, it was found that their pal productivity was not completely related with defibration acti..

orientation-controlled immobilization of protein molecules on thin organic films deposited by the plasma technique

the technique for the fabrication of protein-immobilized organic films was studied. a thin organic film 100 nm thick was deposited on the surface of substrates by the plasma polymerization technique, then the surface of the film was treated with a glow discharge in nh//3 gas. surface characterization by x-ray photoelectron spectroscopy wa..

strip fabrication from powder metal using hip/peeling techniques

fabricating an experimental 13 chromium, 2 aluminum alloy steel into strip first requires compacting gas atomized metal powder into a ring by hot isostatic pressing. thin strip then is produced by peeling - a technique of machining a wide chip off of the outside diameter of the ring. this process and subsequent annealing are described wit..

surface characterization of sic whisker/2124 aluminium and al//2o//3 composites machined by abrasive water jet

the machinability of two classes of high-temperature composites (sic whisker/2124 aluminum and sic whisker/alo//2o//3) with an abrasive waterjet (awj) was investigated. the as-machined surfaces were characterized by scanning electron miscroscopy (sem), energy dispersive x-ray spectroscopy (eds), and profilometry to determine the surface f..

diffusion bonding of al-mg-si series 6063 alloy reinforced with alumina short fibers

the al-mg-si a6063 alloy reinforced with alumina short fibers has been diffusion-bonded with the bond interface perpendicular to the direction of the fibers, i. e. , the direction of the highest strength, and the effects of surface treatments, bonding parameters (temperature and pressure) and insert metals on the bond strength have been s..

biosensors for food industry

novel biosensor systems were constructed for food industry. in order to determine fish freshness, a multifunctional enzyme sensor system was developed by combining a double membrane consisting of a 5 $prime$ -nucleotidase membrane and a nucleoside phosphorylase-xanthine oxidase membrane with an oxygen electrode each nucleotide concentrati..

xps study on the surface structure of carbon fibers using chemical modification and c1s line shape analysis

the chemical modification technique coupled with x-ray photoelectron spectroscopy is a useful tool for the quantitative analysis of surface functional groups of carbon fibers. major functional groups on unoxidized and oxidized carbon fiber surfaces are carbonyl groups and hydroxyl and carbonyl groups, respectively line shape analysis of t..