silicon micromachining for microsensors and microactuators

system integration is often limited by the incompatibility of technologies used for the fabrication of signal processors and signal transducers like sensors and actuators. most of the problems related to conventional transducers such as miniaturization, performance or price can be overcome by the use of silicon as a mechanical material an..

the mechanism of fiber-matrix interactions in carbon-carbon composites

fiber-matric interactions have to be studied in order to determine the correlation between the conditions of the carbon fiber surface and the mechanical properties of c-c composites. the authors demonstrate the use of surface treatments and de-treatments to optimize the mechanical properties of c-c composites. oxygen plasma and nitric aci..

ion-assisted processing of gaas for optical devices

gas etching techniques, such as reactive ion etching, ion beam milling and chemically assisted ion beam etching, have been used to produce a range of optical and electronic components in gaas. large structures, typically 10-100 mu m deep, such as spherical microlenses, mesas, columns and fibre-location-channels, may be fabricated in gaas ..

wear resistance of ion-implanted, chemically vapor-deposited nickel die inserts

high precision dies can be fabricated to a near-net shape by nickel vapor forming: however, die wear severely limits the precision of the product when these nickel dies are used in the molding of glass-filled epoxy parts. ion implantation of n/sup +/ into die surfaces improved the wear resistance of the dies and decreased the friction coe..

optimisation of enzyme electrodes

enzyme electrodes have been fabricated in a variety of ways and used successfully for aqueous solution measurement. knowledge about the fundamental basis of their operation has increased substantially in recent years, but the final, partly technological, hurdle of adaptation for practical use remains to be fully surmounted. the authors' r..

the mechanical properties of glass/polypropylene multilayer laminates

multilayer laminates have been fabricated from thin sheets of glass and polypropylene. by the use of a special surface treatment applied to the glass surfaces, fully transcrystalline polypropylene layers could be formed. this facilitated the interpretation of the mechanical properties of the laminates in terms of the microstructure of the..

electrical contact studies of chemically treated yba/sub 2/cu/sub 3/o/sub 7-x/ surfaces

results on electrical characterization of high t/sub c/ thin film surfaces modified by different surface treatments are presented. in particular, this work examines the effect of a br/ethanol chemical etch, which has previously been shown to remove surface contamination while preserving the cu(+2) oxidation state electrical measurements o..

cleaning of yba/sub 2/cu/sub 3/o/sub 7-x/ surfaces by thermal oxidation treatments

when exposed to air, yba/sub 2/cu/sub 3/o/sub 7-x/ reacts to form a nonsuperconducting surface layer which degrades the quality of devices formed by subsequent deposition of overlayers degradation may also be caused by contamination of the surface during prior processing. the authors have investigated the use of thermal oxidation treatmen..

electrochemical microbiosensors

there are three main classes of electrochemical microbiosensors based on silicon chip, namely conductimetric, amperometric and potentiometric (i.e. fet). a brief account of the detection principle, fabrication and mode of operation of the first two types of microbiosensors with specific clinical applications is presented. these sensors ar..

mechanical design of a rf electron gun

brookhaven national laboratory is building an accelerator test facility at which the authors plan to study laser acceleration of electrons, inverse free electron lasers and the production of x-rays by non-linear compton scattering. the facility contains an electron gun, linac, lasers and ancillary systems which will enable the production ..