investment casting for the future

author reviews some recent changes in the field of investment casting and makes some predictions for the industry's future growth the technique - as exemplified by the lost wax process - has many inherent advantages. since an expendable pattern without split lines is used, limitations on design complexity are minimised, particularly if de..

multi-stage pretreatment washers made of plastic

power spray washers used to clean and conversion coat parts prior to painting generally are constructed of steel or stainless steel. now available are surface treatment tunnels made of composite plastic materials. they offer the primary advantage of being corrosion resistant. the composite material used is a sandwich of resin, glass fiber..

large optics technology

this conference proceedings contains 30 papers. among the major subjects covered are the following: fabrication and testing of large optical mirrors and large aspheric optics, new telescope design (prismatic telescope, fourier transform telescope, space telescope, aspheric and spherical primary telescopes), large optics programs and mater..

preprints for the 112th isij meeting, part ii

this conference proceedings contains 24 papers arranged in the following order: ironmaking; ironmaking/steelmaking; steelmaking; shaping and fabrication - instrumentation and control; chemical analysis - surface treatment; products and properties; and new materials and new processing. twenty-four papers are separately indexed. technical a..

glucose oxidation in a dual hollow fiber bioreactor with a silicone tube oxygenator

a dual hollow fiber bioreactor, consisting of an outer silicone membrane for oxygen supply and an inner polyamide membrane for substrate permeation, was used as an immobilized enzyme reactor to carry out enzymatic glucose oxidation. attaching a silicone tube oxygenator to provide an additional oxygen supply improved the conversion in gluc..

polymeric materials for corrosion control (developed from a symposium at the 190th meeting of the american chemical society)

this conference proceedings contains 31 papers divided into three general areas: evaluation of material performance, adhesion and interfacial aspects of corrosion protection, and materials for corrosion protection. topics presented include alternating current impedance, underfilm darkening, anticorrosive paints, electrochemistry of polyme..

preprints for the 111th isij meeting, part vi

this conference proceedings contains 24 papers. topics presented include ironmaking; steelmaking; shaping and fabrication; instrumentation and control; chemical analysis; surface treatment; products and properties; and new materials and new processing. all the papers are abstracted separately. technical and professional papers from this c..

synthetic vaccines

recent studies have shown that chemically synthesized peptides representing a part of the surface of a protein can elicit antibodies reactive with the native molecule. some of the antibodies thus obtained are also shown to have activities to neutralize viruses when the peptide constituting the surface antigen of the virus is used for immu..

x-ray photoelectron and electron spin resonance study of wool treated with aqueous solutions of chromium and copper ions

x-ray photoelectron spectroscopy and electron spin resonance have been used to study the chemical modification of the wool fiber arising from the chrome mordanting process and the cupric ammonium sulfite shrinkproofing treatment. variations in the sites of reaction and bonding of the metal ions to the wool fiber were observed, and selecti..

carbon and carbon - coated electrodes for multistage depressed collectors for electron - beam devices - a technology review

important aspects of the carbon and carbon-coated multistage depressed collectors (mdc) electrode technology developed at the nasa lewis research center as well as related technology developed under nasa sponsorship are reviewed. the following topics are included: electrode material properties, surface treatment procedures, surface physic..