Materials Literature
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An axisymmetric liquid bridge is subjected to an axial temperature difference. Thermal variations in surface tension drive a motion that is described using lubrication theory for slender bridges. At leading order in aspect ratio, a class of similarity solutions is obtained valid in the core region away from the endwal…
PTC materials with the nominal composition (Ba 0.997 La 0.003 ) (Ti 1.012 Mn0. 0005 )O 3.025 were prepared from reagent‐grade barium carbonate and commercial grades of anatase and rutile. Both forms of TiO 2 had approximately the same crystallite size. The solid state reaction was followed by thermal analysis and by X…
The phase separation of a mesogen-nonmesogen mixture was studied with particular emphasis on the effects of boundary conditions imposed at container walls such as rubbed polyvinylalcohol (PVA) film, obliquely evaporated SiO film, free surface, etc. Microscopic observations revealed that the equilibrium shapes of a nem…
Results indicating the extent to which flow in a miscible polymer blend can displace the phase separation temperature are reported. Data were obtained on the system, polystyrene/poly (vinyl methyl ether), in the temperature ranges where it undergoes exsolution upon heating. The theoretical framework for the observed f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActive sites for hydrogen adsorption on magnesium oxideTomoyasu Ito, Masamichi Kuramoto, Minoru Yoshioka, and Taneki TokudaCite this: J. Phys. Chem. 1983, 87, 22, 4411–4416Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue…
The elastic fibers in the skin and other organs can be affected in several disease processes. In this study, we have developed morphometric techniques that allow accurate quantitation of the elastic fibers in punch biopsy specimens of skin. In this procedure, the elastic fibers, visualized by elastin-specific stains,…
A new method for preparing fused silica and high‐silica glasses through the sougel process is described. Ordinarily, fused silica is formed by fusion of silica at 1900° to 2000°C. The method described consists of preparation of a porous body by mixing colloidal silica with water, drying, redispersion, molding by casti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHost-guest complexes of 18-crown-6 with neutral molecules possessing the structure element XH2 (X = oxygen, nitrogen, or carbon)A. Elbasyouny, H. J. Bruegge, K. Von Deuten, M. Dickel, A. Knochel, K. U. Koch, J. Kopf, D. Melzer, and G. RudolphCite this: J. Am. Chem. Soc. 1983…
A unified treatment has been constructed which gives a perspective view of incommensurate(IC)-commensurate(C) phase transition schemes in A 2 BX 4 type crystals. We have shown that a microscopic treatment based on `Extended Antiferroelectric Interaction Ising' model can explain most of the observed features of IC-C ph…
Results are presented of a study of physical and optical properties of amorphous hydrogenated carbon films (a-CH x ) prepared by d.c. magnetron glow-discharge decomposition of acetylene in argon, both as prepared and after heat treatment in vacuum. The dependences of density, deposition rate and hardness on the partia…
Abstract Small colloidal particles of ZnS were obtained by precipitation of Zn 2+ with SH − in the presence of colloidal silicon dioxide. Co‐colloids were prepared by simultaneously precipitating ZnS and CdS. Colloidal ZnS fluoresces at 425 nm. 90% of the fluorescence decays within 30 ns. The fluorescence is partly qu…
The natural frequency fn and damping constant δ of a bubble in liquid have been determined by observing the resonance of the bubble to forced oscillation. The bubble was retained under a rigid plate horizontal disk, and the oscillation was applied by underwater speaker. The applied frequency f was kept constant while…
Abstract The Raman spectra of KClO 3 are reported at room temperature up to pressures of 60 kbar in a diamond‐anvil cell. The phase transition between phases I and II occurs at approximately 7 kbar, is sluggish and the spectra show that the two phases coexist over a pressure range of approximately 5 kbar. The Raman sp…
The total cold reduction and reduction per pass used during the drawing of fine wires affected the mechanical properties of two beta-titanium alloys. Both Ti-11.5Mo-6Zr-4.5Sn and Ti-13V-11Cr-3Al showed increased yield strengths and low moduli of elasticity, which resulted in wires appropriate for orthodontic applicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction analysis of airborne particulates collected by an Andersen sampler. Compound distribution vs. particle sizeTsutomu. Fukasawa, Masaaki. Iwatsuki, and Sujith P. TillekeratneCite this: Environ. Sci. Technol. 1983, 17, 10, 596–602Publication Date (Print):Octobe…
The results of a detailed analysis of the long-term and high-temperature oxidation behaviour of Zircaloy-4 in steam (600-1600 deg. C) may be summarized as follows: During an introductory phase of ''normal'' oxidation up to about 30 min, an adherent oxide layer was formed. More specifically: a cubic rate law governed t…
A Monte Carlo simulation of polymer crystal growth from the melt is presented. This two-dimensional model approximates growth by laying down crystal stems one at a time. The Monte Carlo simulation of various geometric models of the crystal surface yields Regime I and Regime II growth similar to that predicted by Lauri…
Technetium‐99 can be dissolved in Mg 2 TiO 4 spinels to form solid solutions with low dissolution rates. These materials are possible host phases for 9 9Tc in ceramic nuclear waste forms .
The existing theoretical cross section data for the charge exchange process of multiply charged fully stripped ions with hydrogen atoms are evaluated in the energy range from ∼10 eV/u to ∼103 keV/u. The evaluation has been performed on the basis of both pure theoretical arguments and comparison with the most accurate…
Abstract We report a melt spinning and viscosity study of two semiflexible homopolyesters containing both rigid and flexible segments in the repeating unit. Single filaments of the polyesters formed from 4,4′‐diacetoxybiphenyl and azelaic acid (PB7) and sebacic acid (PB8), and from 4′‐hydroxyphenyl‐4‐hydroxycinnamate…