Materials Literature
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The interactions of very pure and practically 100% dense α‐SiC with nickel and iron at 850°C were investigated. Large reaction zones, consisting of carbon and silicides of Ni and Fe, were examined by microprobe analysis. By means of marker experiments, the diffusion mechanisms were investigated: only Ni and Fe migrate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecular reflectivity of neutrons by thin polymer filmsT. P. Russell, A. Karim, A. Mansour, and G. P. FelcherCite this: Macromolecules 1988, 21, 6, 1890–1893Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https:…
The blocking of dislocations at a slip barrier, such as a grain boundary, is modelled by considering, in the domain of distribution of dislocations ahead of the slip band, a small zone representing a locked source or the width of the boundary itself. The ‘friction stress’ in this small zone is calculated so that no in…
Tensile specimens of type 316L stainless steel with a grain size of 5.0 μm have been deformed at a constant strain rate of 10−3 s−1 over the temperature range 21–900°C and by differential strain-rate test technique over strain rates from about 10−5 to 10−3 s−1 at temperatures in the range 750–900°C. The normalized yie…
A computer study of rectified diffusion was made over the biomedical frequency range (1-10 MHz). Solutions of the Gilmore-Akulichev [E. Cramer, in Cavitation and Inhomogeneities in Underwater Acoustics, edited by W. Lauterborn (Springer, New York, 1980), pp. 54-63] formulation for bubble dynamics were combined with th…
Abstract In vibration welding of thermoplastics, frictional work done by vibrating two parts under pressure, along their common interface, is used to generate heat to effect a weld. The main process parameters in vibration welding are the weld frequency, the amplitude of the vibratory motion, the weld pressure, and th…
The acoustic cavitation threshold of an aqueous solution has been measured at megahertz frequencies as a function of pulse width and pulse repetition frequency for various combinations of these quantities. The fluid tested was a 0.1M KOH-H3BO3 buffer solution with pH 10.9, which contained luminol, was saturated with a…
Abstract Clay mineral abundances and illite-smectite (I/S) compositions have been determined by X-ray diffraction (XRD) in shales of Permo-Triassic to Quaternary age from seven wells in the Viking Graben and Moray Firth. Chemical analyses of size fractions provide evidence that diagenetic illitization of smectite has…
Abstract Six standard polytypes of micas exist that have c-periodicities between 1 and 6 layers; these can be subdivided into groups A and B according to whether the octahedral cations are in the same set of positions in every layer or alternate regularly between I and II possible sets of positions (alternate slant di…
The effect of urotropine, homopiperazine, and n-decylamine on the corrosion of pure iron in deaerated and aerated 0.1 M Na2SO4 solution, with a pH value 2, at 25 C, was investigated by polarization techniques and measurements of the double layer capacitance using the single pulse method. It was found that urotropine a…
Crack growth resistance curves ( R curves) for the growth of surface cracks have been measured in a series of magnesia‐partially‐stabilized zirconia ceramics with varying degrees of transformation toughening. The shapes of the R curves are correlated with strength‐toughness relations and the predictions of fracture me…
Abstract On the basis of neutron diffraction studies, the two inner-hydroxyl ions in highly ordered kaolinite were recently shown to be differently oriented. One of the inner-hydroxyl ions points generally toward a hole in the octahedral sheet and the other toward a hole in the tetrahedral sheet. These orientations an…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxomanganese(IV) porphyrins identified by resonance Raman and infrared spectroscopy. Weak bonds and the stability of the half-filled t2g subshellRoman S. Czernuszewicz, Y. Oliver. Su, Michael K. Stern, Kathleen A. Macor, Dongho. Kim, John T. Groves, and Thomas G. SpiroCite t…
ABSTRACT The photosynthetic pigments of 51 species (71 isolates) of tropical and sub‐tropical diatoms from 13 out of 22 families were examined. These were the Thalassiosiraceae, Melosiraceae, Coscinodiscaceae, Rhizosoleniaceae, Biddulphiaceae, Chaetoceraceae, Lithodesmiaceae, Eupodiscaceae, Cymatosiraceae, Diatomaceae…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron and x-ray scattering studies on semicrystalline polymer blendsT. P. Russell, H. Ito, and G. D. WignallCite this: Macromolecules 1988, 21, 6, 1703–1709Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https…
The dynamics of a material in two phases is studied in the context of phase-field models based on a Landau–Ginzburg free energy functional. They consist of a system of two nonlinear diffusion equations for the temperature and order parameter. The interface between the two phases is treated as a moving internal layer i…
A new algorithm is proposed for Monte Carlo simulation of MBE growth. The algorithm is based on using conditional probabilities to select the sites at which events occur. This has the advantage of being economic on computer time, the time per event scaling as the square root of the number of sites in the system. It is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTd10-d10 Interactions: multinuclear copper(I) complexesKenneth M. Merz Jr. and Roald HoffmannCite this: Inorg. Chem. 1988, 27, 12, 2120–2127Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi…
Abstract The quality of large semiconductor crystals grown from the melt for use in electronic and optoelectronic devices is strongly influenced by the intricate coupling of heat and mass transfer and melt flow in growth systems. This paper reviews the present state of understanding of these processes starting from th…