denture base materials reinforced with glass fibres. part 2: the effect of glass fibre contents on bending properties

the purposes of the present study are to examine the bending properties of composite acrylic resins having various glass fiber characteristics and to determine the effect of surface treated fibers on the bending strength and bending elasticity of the base composites. a study on laying glass fibers with different aspect and volume ratios i..

aesf third international pulse plating symposium

this conference proceedings on 'pulse plating' contains 17 papers. the topics covered are: pulse plating vs. dc plating; high speed metal deposition using interrupted current plating techniques; orientation and morphology of pulse plated deposits; pulsed current electrodeposition of palladium and alloys, gold and alloys, nickel and alloys..

rifamycin b production by nocardia mediterranei immobilized in a dual hollow fibre bioreactor

continuous production of rifamycin b was studied using nocardia mediterranei (atcc 21789) immobilized in a dual hollow fiber bioreactor designed for cultivating aerobic cells. in the reactor operation the volumetric productivity based on the volume occupied by the immobilized cells was 108 mg l** $minus$ **1 h** $minus$ **1 when air was u..

electrochemically activated wear of metal fibre brushes

the electrical and tribological properties of metal fibre sliding contacts are studied. the cu-cd fibres have a diameter of 50 $mu$ m. they slide on cu-cr tracks with optional surface treatments (gold electroplated on a nickel underplate). the working atmosphere is generally wet pure nitrogen. several types of experimental results are rep..

photoelectrochemical fabrication of stainless steel filter elements

precision fabrication of stainless steel filters is described controlled depth (10 $mu$ m) of metal removal was achieved by an anodic dissolution technique. in addition this technique gave a very smooth surface finish. the limitations encountered in chemical milling methods were largely overcome by this method. unlike the conventional ecm..

interactions between polyimide-coated carbon fiber and epoxy resin

for the purpose of enhancing the reinforcement-matrix interaction in carbon fiber reinforced polymer composite, mechanical and spectroscopic studies were made on the epoxy resin composite reinforced with the carbon fiber coated with thin layer of polyimide resin. the polyimide resin was formed by in situ polymerization of aromatic diamine..

carbon fibre surfaces - characterization, modification and effect on the fracture behaviour of carbon fibre-polymer composites

a survey of surface treatments for carbon fibers shows that the predominating ones are those involving surface oxidation. the state-of-the art treatments, applied routinely to commercial cf, provide 2-4 fold increases in the fiber-resin adhesion strength, both in shear and in tension. in composites, this adhesion normally is fully adequat..

immobilization of urease onto poly(ethylene-co-vinyl alcohol) hollow fibers

urease was ionically bound to the poly(ethylene-co-vinyl alcohol) (eval) hollow fiber surface modified with two aminoacetals, 2-dimethylaminoacetoaldehyde dimethylacetal (aaa) and 3- $left bracket$ 3-(dimethylamino)propylamino $right bracket$ propionaldehyde dimethylacetal (apa). the surface modification, enzyme binding and enzyme reactio..

preparation of weak acid-strong base type charge-mosaic membrane in thiol-quaternary amine groups

triblock copolymer, poly(4-vinylbenzyldimethylamine-b-isoprene -b-tert-butyl-4-vinylphenyl sulfide) was prepared by sequential anionic polymerization method. film specimens of this sample show a clear three-layer lamellar structure. each film was subjected to chemical modifications: quaternization, cross-linking, and elimination of tert-b..

development of a wear test apparatus for screening bearing-flange materials in computer tape drives

an accelerated-wear test apparatus was developed to screen bearing-flange materials. during the test, tape edges rub against two flat test specimens (which are easy to fabricate). the clamping arrangement of the specimens provides the same contact with the tape during repeated tests. the tape is loaded against the sample by deadweight loa..