Materials Literature
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X-ray diffraction measurements of thin chiral smectic C (Sc∗) liquid crystals between solid plates coated with rubbed polymer film were performed under an electric field. A variety of local layer structures which depend upon the boundary conditions could be observed, including bookshelf and chevron, and some distorted…
Forage production in the Appalachian Region is limited by soil acidity and nutrient deficiencies including phosphorus. North Carolina phosphate rock (PR), a carbonate substituted fluorapatite, should be reactive in these soils and may be appropriate as a low cost P fertilizer. An experiment was conducted to evaluate t…
Melting experiments with plagioclases were performed in the systems Ab-An, Ab-An-H2O, Qz-Ab-An-H2O, and Qz-Or-Ab-An-H2O-CO2. The experimental products were analysed by electron microprobe, and the kinetics of the reactions were studied qualitatively.Melting of the plagioclase in the system Ab-An (P = 1 atm, T = 1420°C…
Author: Ruth, A. A. et al.; Genre: Journal Article; Issued: 1992; Keywords: ALKANES; VISCOSITY; DENSITY; GLASS-TRANSITION RANGE; TEMPERATURE DEPENDENCE<br/>; Title: Temperature-dependence of viscosity and density of glass-forming alkanes
The transition of insulin between its crystallographically defined states T and R is connected with considerable change even of backbone structure: the N-terminal B chain (residues B1-B8) refolds from extended conformation in T into helical in R, and vice versa. Although hitherto observed only in hexamers the transiti…
The reaction of N,N,N′-tris(trimethylsilyl)formamidine with SeCl2 affords 1,2,3,5-diselenadiazolium chloride, which can be reduced with triphenylantimony to the corresponding diselenadiazolyl radical [HCN2Se2]˙; the solid state structure and conductivity of the dimer [HCN2Se2]2 are reported.
We report measurements of osmotic compressibility in a quasibinary liquid mixture of 3-methylpyridine, water, and heavy water. The measurements probed the lower consolute point (${\mathit{T}}_{\mathit{L}}$) for samples of varying loop sizes (\ensuremath{\Delta}T). An exact doubling of the critical exponent (\ensuremat…
Diffusion coefficients of hydrogen in fully annealed specimens of pure iron, Fe-(0.46∼5.17 at%)Al, Fe-(0.53∼5.06 at%)Si, Fe-(0.47∼7.67 at%)V, Fe-(0.40∼5.10 at%)Cr, Fe-0.35 at%Mn, Fe-(0.41∼4.79 at%)Co, Fe-(0.98∼5.16 at%)Ni, and Fe-(0.51∼3.35 at%)Mo alloys have been measured by an electrochemical permeation method betwe…
The effect of F on the glass transition behavior of albite, diopside, and four other silicate melts has been investigated using scanning calorimetry. The addition of F to all silicate melts investigated results in a strong, nonlinear decrease of the glass transition temperature (Z' as recorded by the peak temperatures…
Silicon carbide composites reinforced with unidirectionally oriented carbon fibers have been fabricated by slurry impregnation followed by hot pressing. Identification of crystalline phases, observation of the metallographic structure, and measurement of flexural strength and fracture toughness at room and high temper…
The basic principles and practical considerations of Auger-Photoelectron Coincidence Spectroscopy (APECS) are discussed. In this technique, core photoelectrons and their associated Auger elecrtons are detected in time coincidence. For true coincidence counts, both electrons originate from the same photoexcitation even…
The nilrosylcyanide crystallizes in space group Pnma with a = 13.4911(9), b = 7.1698(6), c = 10.8623(7) Å, Z = 4, D m = 2.01(2) Mg m−3 and D x - 1.99 Mg m−3. Full-matrix least-squares refinement of 1232 unique reflections yielded final reliability factors, R = 0.048 and R w —0.052, and a “goodness-of-fit” value of 1.0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the first main group oxo-centered trinuclear carboxylateMaria T. Andras, Stan A. Duraj, Aloysius F. Hepp, Phillip E. Fanwick, and Matthew M. BodnarCite this: J. Am. Chem. Soc. 1992, 114, 2, 786–787Publication Date (Print):January 1, 1992Publ…
Rheo-optical studies on aligned and unaligned melts of a main chain thermotropic polyester with flexible spacers are discussed in terms of the predictions of the Ericksen-Leslie equations. Experiments show that the material exhibits two different shear-flow regimes depending on the temperature at which the experiments…
Radical polymerization of acrylonitrile within the pores of zeolites Y and mordenite produces intrazeolite polyacrylonitrile that can be pyrolysed to form conducting carbon filaments.
La 1- x Ca x FeO 3- y compounds (0 ⩽ x ⩽ 0.50) have been synthesized and investigated by means of X-ray diffraction and Mössbauer spectroscopy. A linear decrease of the lattice constants of the orthorhombic perovskite with increasing x is found and explained as being partially due to the influence of the increasing va…
ABSTRACT Melting experiments with plagioclases were performed in the systems Ab-An, Ab-An-H 2 O, Qz-Ab-An-H 2 O, and Qz-Or-Ab-An-H 2 O-CO 2 . The experimental products were analysed by electron microprobe, and the kinetics of the reactions were studied qualitatively. Melting of the plagioclase in the system Ab-An ( P…
The influence of SiO 2 addition on the densification and microstructural development of high‐purity Si 3 N 4 during hot isostatic pressing (HIP) was studied. During HIP, densification was promoted, but the phase transformation from α ‐Si 3 N 4 to β ‐Si 3 N 4 was impeded by SiO 2 . Analysis using a simple model shows t…
The compounds Sr8[Al12O24]S2 and Ca8[Al12O24]S2 have been prepared by reduction of the corresponding sulfate materials, M64[Al96O192]·(SO4)16via an intra-cage reaction. The materials crystallise with the simple body-centred cubic sodalite structure. Profile refinement of powder X-ray data has been undertaken showing a…
Monobloc type durable rolls of over 10000 kg have been developed by ingot metallurgy for hot rolling mills, and the metallurgy and the manufacturing process of the roll are described. The microstructure of the roll consists of hard primary carbides, mainly vanadium rich MC, embedded in the highly tempered matrix. The…