Materials Literature
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ABSTRACT During a two year period 457 clones of the diatom Skeletonema costatum were isolated prior to and during the summer‐fall and winter‐spring blooms of this species in Narragansett Bay, R.I. Their allozyme banding patterns were examined for 5 enzyme loci. Genotypic frequencies indicated that the winter bloom pop…
Microscopic observations of the surface structure and composition of thin films of silver-gold alloys are used to deduce the processes involved in the dissolution of these alloys in nitric acid solutions. The micromorphology consists of an island-and-channel structure whose formation depends in detail on the initial o…
The light scattering technique was utilized to measure the phase separation temperatures (cloud points) of mixtures containing a polystyrene and a polybutadiene of various molecular weights and also of mixtures containing a polystyrene and a random or block copolymer of styrene and butadiene. The data was analyzed to…
The dynamics of melting in two dimensions is studied, assuming that solids melt into liquids via a sequence of dislocation and disclination unbinding transitions. The hydrodynamics of solids, hexatics, and liquids in the presence of dislocations and disclinations is described as well as the dynamical response near the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane activation and functionalization under mild conditions by a homogeneous manganese(III)porphyrin-iodosylbenzene oxidizing systemCraig L. Hill and Bruce C. SchardtCite this: J. Am. Chem. Soc. 1980, 102, 20, 6374–6375Publication Date (Print):September 1, 1980Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPacking Analysis of Carbohydrates and Polysaccharides. 11. Molecular and Crystal Structure of Native Ramie CelluloseCarrie Woodcock and Anatole SarkoCite this: Macromolecules 1980, 13, 5, 1183–1187Publication Date (Print):September 1, 1980Publication History Published online…
Infrared absorption was measured on an NajO‐K 2 O‐ZnO‐Al 2 O 3 ‐SiO 2 glass with up to ∼11 wt% water. Fundamental and overtone‐combination bands were observed at 1.41, 1.91, 2.22, 2.87, and 6.1 μm. Molar absorptivities were determined for the hydrated glass for H 2 O and OH levels using the molar absorptivity calculat…
Kinetic secondary electron emission from a solid target resulting from incidence of keV electrons or keV and MeV ions is treated theoretically on the basis of ionization cascade theory. The energy and angular distribution and the yield of secondary electrons are calculated for a random target. These quantities are det…
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Solubilities of MgO in aqueous HC1 solutions at 23°±3°C were measured and combined with analyses of neat magnesium oxychloride cements, cured in sealed containers, to construct an equilibrium phase diagram for the system MgO‐MgCl 2 ‐H 2 O. Specific gravities and acidities of solutions saturated with MgO and relative h…
Raman scattering and infrared reflectance have been measured in 2H-MoSe 2 . We observed all Raman-active modes, A 1g , E 1g , E 2g 1 and E 2g 2 , and two infrared-active modes, E 1u 2 and A 2u 2 . Intralayer force constants are estimated from the central force model. The bond between metal (Mo) and chalcogen (Se) pred…
High‐temperature creep experiments were made on olivine single crystals under compressional stress to large strains. At strains larger than about 40 to 60%, dynamic recrystllization occurs and cellular wall dislocation structure is formed. Recrystallized grain size dg(µm) and cell wall spacing ds(µm) are dependent upo…