vapor sensors formed by chemical modification of porous silicon

we describe the fabrication of moisture sensors based on the use of porous silicon (ps) or oxidized porous silicon (ops) as the sensing element in a capacitance device and discuss their application in evaluation of moisture barrier coatings for integrated circuits (ics) . the capacitance of a typical sensor changes from 4 nf/cm(sup 2) whe..

presynaptic role for protein kinase c in hippocampal mossy fiber synaptic transmission. reprint: presynaptic role for protein kinase c in hippocampal mossy fiber synaptic transmission

it has been suggested that the maintenance of long term potentiation (ltp) in the hippocampal mossy fiber (mf) synapse involves a presynaptic mechanism that does not require the activation of protein kinase c (pkc), since this enzyme appears to be absent in the mf presynaptic terminals. in the present study the authors evaluated this prop..

emu evolution

evolution of extravehicular mobility unit (emu) technology is necessary to support the extravehicular activity (eva) requirements of the space station freedom program and those of the space exploration initiative (sei). key qualities supporting long-duration missions include technologies that are highly reliable, durable, minimize logisti..

pressurized membrane chemical sensor. patent

a fiber optic based chemical sensor detects chemical species in solution. a fluorogenic indicator is forced through an ultrafiltration membrane into an analyte solution. complex formation between indicator molecules and target ions occurs at the membrane-solution interface where light from a bifurcated fiber optic cable stimulates fluores..

toxicity of intraperitoneal doses of microcystin-lr in two strains of male mice. reprint: toxicity of intraperitoneal doses of microcystin-lr in two strains of male mice

cyanobacterial blooms in human water supplies have been associated with increased liver enzymes in serum and conventional water treatment procedures may not effectively remove the hepatotoxins produced by microcytis aeruginosa m. aeruginosa, a fresh water cyanobacterium, produces cyclic heptapeptide hepatotoxins termed microcystins (and s..

determination of the limiting sensitivity and specificity for the immunoassay of antigens and antibodies using ord's evanescent wave method. midterm rept. 1 feb 90-31 jul 91

the primary goal of this contract is to obtain a rigorous side by side comparison of enzyme linked immuno sorbent assay (elisa) and ord's evanescent wave immunoassay (ew) systems. half way into the contract we have found that when the chemistry of coupling reagents onto the solid phase is identical for both systems, i.e. when fibers are u..

determination of interfacial properties. final rept. 20 feb 89-19 aug 91

the primary objective of this program was to determine surface displacements in the resin matrix adjacent to a graphite fiber during applied fiber strain. these data are to be used to quantify the effect of interphases on fiber-matrix interfacial elastic properties we successfully demonstrated the measurement of in-and out-of-plane displa..

microwave heating: industrial applications. january 1980-march 1992 (citations from the ntis database). rept. for jan 80-mar 92

the bibliography contains citations concerning industrial uses and design of microwave heating equipment. included are heating and drying of paper, industrial process heat, vulcanization, textile processing, metallurgical heat for sintering and ceramic manufacturing, food processing, and curing of polymers. (contains 158 citations with ti..

design and fatigue behaviour of a cfrp/titanium joint for the propfan engine crisp

a counter rotating integrated shrouded propfan (crisp) is investigated for civil aircraft application to reduce field consumption, to reduce noise, and to increase take off thrust limitations in size of the propfan engine and the enormous centrifugal forces caused by the fan blades, led to the use of carbon fiber reinforced plastics (cfrp..

diffused junction, surface texture engineered gaas heteroface solar cell

surface texture engineered (i.e., v-grooved front surface and recessed contact metallization) gaas heteroface space solar cells are considered. surface texture engineering of infinite melt liquid phase epitaxy (imlpe) cells is discussed. compatibility with current pilot production manufacturing process, in particular with the front contac..