Materials Literature
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Two strategies to solve the problem of instability of photoanodes against photocorrosion have been explored. The photocorrosion of photoanodes generally occurs when they enter the fabrication of efficient photoelectrochemical cells (i.e. showing high values of the open circuit voltage and photocurrent density). One of…
Abstract The aim of this paper is to assess the importance of fouling of heat exchanger surfaces in the recovery of heat from low-temperature geothermal brines. Samples of brines associated with four western Canadian gas and oil well operations were re-circulated through a test heat exchanger loop over periods of 11 t…
Article A Study of the Decomposition of Supersaturated Mg-Y-Nd, Mg“, and Mg-Nd Alloys / Eine Untersuchung des Zerfalls übersättigter Mg-Y-Nd-, Md-Y- und Mg-Nd-Legierungen was published on May 1, 1988 in the journal International Journal of Materials Research (volume 79, issue 5).
Abstract The formation of networks of various types has been simulated by using a physically realistic model that allows for intramolecular reactions to take place, thus forming loops of any size. The shortcomings of the kinetic approach, where systems are composed of functional groups that are selected at random with…
Abstract Schiff base (SB) monomers of vinylbenzaldehyde with functional amines were prepared. Copolymers of SB monomers with N ‐vinyl‐2‐pyrrolidone soluble in aqueous solutions were obtained in most cases. However, p ‐aminobenzenesulfonamide monomer resulted in gel formation. Thus, the reaction of vinylbenzaldehyde co…
Self-development of poly(methylmethacrylate) (PMMA) resist was done by irradiating various rare-gas ions at 50 keV in a mixed gas atmosphere of XeF2 and O2 to enhance the self-development rate, and the effects of various exposure parameters, including gas pressure, mixing ratio, dose, current density, pulse repetition…
A corrosion testing program was used to survey metal oxides potentially useful in a molten carbonate fuel cell environment. Tests included immersion of polycrystalline sintered pellets, powdered samples immersed in molten carbonate under 10 atm of simulated cathode gas, and immersion gravimetric tests using powder sam…
We have demonstrated that citrate synthase may be assayed by a simple, discontinuous, spectrophotometric procedure based on the measurement of oxaloacetate utilization with 2,4-dinitrophenylhydrazine. The assay is applicable both to the purified enzyme and to cell extracts, and has the advantage that it can be used in…
A transmission-electron-microscope investigation of the orientation relations between faceted icosahedral quasicrystals and crystalline f.c.c. matrix in rapidly cooled alloys of Al-Mn reveals three different orientation relations: In the third relation the f.c.c.[111] axis cannot be exactly parallel to the twofold axi…
An analysis of fiber blending irregularities is presented in relation to the disturbances of blend yarn properties resulting from these phenomena. Fiber blending irregularities were assessed using the original method of yarn surface analysis and a new method of yarn cross-sectional division. These methods correctly re…
Crystals of neuraminidase heads from two different influenza B virus strains have been grown. Neuraminidase crystals of influenza B/Hong Kong/8/73 were grown from solutions of potassium phosphate. The crystals are tetragonal prisms, space group I422; the axes are a = 123 A and c = 165 A. Influenza B/Lee/40 neuraminida…
The Ag/sup +/-Na/sup +/ ion-exchange process in a soda-lime silicate glass was studied at 330 degrees as a function of composition of AgNO/sub 3/-NaNO/sub 3/ melt, mixing condition, and exchange time. The concentration profile of silver in glass was measured by atomic absorption spectroscopy and SEM technique. The sur…
5-Oxo-L-prolinase from Pseudomonas putida is composed of two reversibly dissociable proteins: Component A catalyzes 5-oxoproline-dependent cleavage of ATP, but does not catalyze the decyclization of 5-oxoproline; Component B is required for the coupling of ATP cleavage to ring-opening of 5-oxoproline to form glutamate…
A method of design for electrostatic lenses with given source parameters, first-order properties, and minimum aberrations is presented. It is based on constrained nonlinear optimization techniques. The variables in these procedures are spline coefficients of the axial potential distribution, or the electrode potential…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the thermal decomposition of dimethylsilane at atmospheric pressures in the gas phaseH. E. O'Neal and M. A. RingCite this: Organometallics 1988, 7, 5, 1017–1025Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNear-infrared luminescence of octahedral molybdenum(III) and rhenium(IV) complexes in solutionQin Yao and Andrew W. MaverickCite this: Inorg. Chem. 1988, 27, 10, 1669–1670Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 Ma…
Past proton diffusion determining high conductivity in low temperature and superionic phases of studied crystals is investigated. The diffusion peculiarities in different crystals are revealed and discussed.
Theoretical and experimental studies were performed to determine the effect of oxidant composition on the overpotential of molten carbonate fuel cell cathodes. Pressure level, carbon dioxide and oxygen mole fractions, the diluent species (nitrogen vs. helium), and electrolyte content were varied. The overpotential was…
A process loop to remove tritium from a flowing helium stream in a single pass has been constructed and commissioned. Inventories injected into the loop range from 1 GBq–28 TBq. Concentrations within the stream entering the loop range from 40 MBq/m3 to 15 TBq/m3 . The tritium is removed from the stream by gettering on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavonoid Aglycones from Some Canary Islands Species of SideritisConcepcion Fernandez, Braulio M. Fraga, Melchor G. Hernandez, and Jose M. ArteagaCite this: J. Nat. Prod. 1988, 51, 3, 591–593Publication Date (Print):May 1, 1988Publication History Published online1 July 2004P…