Materials Literature
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The mechanisms of interaction between a twin boundary and dislocations created during the deformation of a bicrystal are analysed by means of HREM. It is shown, on an atomic scale, that intrinsic dislocations enter the grain boundary where they decompose into discrete grain-boundary dislocations with Burgers vectors b…
The mesenchymal tissue component of the teleost pectoral fin bud has been explanted onto microfabricated quartz discs containing patterns of regular grooves of dimensions similar to those encountered by contact-guided cells in the intact fin system. Computer-aided analysis of cell migration on five separate patterns,…
Cyclotella species from several Canadian lakes have been investigated and their morphology illustrated by light and electron microscopy. Cyclotella antiqua W. Smith, C. bodanica var. bodanica Grun., C. bodanica var. affinis Grun., C. meneghiniana Kütz. and C. michiganiana Skvortzow have been identified with certainty…
A fluid of hard spherocylinders is studied in the Onsager model adapted to a nonuniform system. The interfacial properties at nematic-phase--isotropic-phase coexistence are considered. It is found that the angle between the director and the normal to the interface is approximately 60\ifmmode^\circ\else\textdegree\fi{}…
Optically stimulated luminescence and thermally stimulated luminescence in MgS:Ce,Sm and MgS:Eu,Sm have been investigated. It appears that samarium in the form of Sm3+ ion acts as a thermally stable electron trap in MgS:Ce,Sm and MgS:Eu,Sm. A Sm3+ ion becomes a Sm2+ ion capturing an electron when these materials are e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole delocalization in oxidized cerium(IV) porphyrin sandwich complexesRobert J. Donohoe, John K. Duchowski, and David F. BocianCite this: J. Am. Chem. Soc. 1988, 110, 18, 6119–6124Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published…
The use of a mid-infrared transmitting fiber to carry the infrared beam of an FT-IR spectrometer outside of the optical bench is reported. In addition it is demonstrated that it is possible to analyze samples using the fiber as an internal reflection element. The fiber is covered with a protective coating which can be…
We propose a density-functional theory for the isotropic-nematic transition of hard ellipsoids which is in fair quantitative agreement with the recent computer simulations of this system and which improves considerably upon the earlier theoretical attempts. The theory has an explicit oblate-prolate symmetry and leads…
Infrared (IR) reflectivity measurements were undertaken on pure ZrO2 and stabilized ZrO2⋅Y2O3 solid solutions containing 3-, 4-, 7-, 12-, and 20-wt.% Y2O3 over 10–900 cm−1 region as a function of temperature up to 1400 °C. The observed IR active phonons are related to the phase transitions that depend on composition a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, redox behavior, magnetic properties, and crystal structure of a nickel(II)-semiquinone adduct with an unusually strong ferromagnetic couplingCristiano Benelli, Andrea Dei, Dante Gatteschi, and Luca PardiCite this: Inorg. Chem. 1988, 27, 16, 2831–2836Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCu(terpy)X2 (X = Br-, NCS-): complexes with an unusual five-coordination. Structural and spectroscopic investigationM. I. Arriortua, J. L. Mesa, T. Rojo, T. Debaerdemaeker, D. Beltran-Porter, H. Stratemeier, and D. ReinenCite this: Inorg. Chem. 1988, 27, 17, 2976–2981Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electronic structure of highly anisotropic low-spin ferric porphyrin complexes based on single-crystal EPR measurementsDaryl. Inniss, S. Michael. Soltis, and Charles E. StrouseCite this: J. Am. Chem. Soc. 1988, 110, 17, 5644–5650Publication Date (Print):August 1, 1988Pub…
Reactivity of white and hispanic skin after exposure to sodium lauryl sulphate (SLS) has been investigated. The tests were performed on the back as follows: untreated skin, skin pre-treated with short-term occlusion and delipidized skin. Irritant reactions were induced by applying 0.5% and 2.0% SLS via Finn chamber pa…
The optical nonlinearity of commercial and experimental CdSexS1−x glasses has been studied using a single-beam absorption saturation technique employing 1−5-psec pulses. Glasses showing strong three-dimensional quantum-confinement effects were found to be more difficult to saturate than glasses with larger crystallite…
Abstract Non‐isothermal crystallization kinetics of poly(ether‐etherketone), PEEK, in the presence of carbon fibers has been studied for APC‐2 composites. Samples of APC‐2 PEEK composite were cooled from the melt at rates ranging from −1 to −20°C/min. A differential scanning calorimeter was used to monitor heat flow d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn "expanded porphyrin": the synthesis and structure of a new aromatic pentadentate ligandJonathan L. Sessler, Toshiaki. Murai, Vincent. Lynch, and Michael. CyrCite this: J. Am. Chem. Soc. 1988, 110, 16, 5586–5588Publication Date (Print):August 1, 1988Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMutual diffusion in the miscible polymer blend polystyrene/poly(xylenyl ether)Russell J. Composto, Edward J. Kramer, and Dwain M. WhiteCite this: Macromolecules 1988, 21, 8, 2580–2588Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Publish…
Sb-Te alloy films are developed as rewritable optical recording materials based on amorphous crystalline phase transformations. The crystallization process of Sb-Te sputtered films is systematically studied through measurement of recording characteristics to solve the trade-off problem between data (amorphous) stabili…
In this paper a presentation is given of some of the basic physics of the soft-mode ferroelectric effect, along with its experimental background. Further, possible applications in electrooptic devices are elucidated. A fast (sub-microsecond) electrooptic switching can be achieved in the A* phase, and in similar orthog…
A one-sided diffusion-limited model for dendritic growth in two dimensions is simulated numerically by means of a Green's function in quasistationary approximation. Anisotropy in the surface tension is found necessary for dendritic growth. Scaling behavior of the growth rate and tip radius is found as function of the…