Materials Literature
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The generalized de Gennes model for the nematic to smectic-$A$ phase transition in liquid crystals with an order parameter with $\frac{n}{2}$ complex components is investigated using the $\ensuremath{\epsilon}$ expansion in the vicinity of four dimensions. It is found that anisotropic critical behavior with correlatio…
Comparative investigation of the process of the structure reordering of disordered implanted silicon layers after thermal (800°C, 30 min) and pulse laser annealing have been carried out. The new laser method of annealing implanted layers has a number of interesting features which provide great efficiency and locality…
To clarify the nature of the ferromagnetic interactions in SrRuO 3 , the Ru 4+ – –Ru 4+ exchange couplings in cubic-perovskite type ARu 4+ O 3 (A=nonmagnetic cation.) were investigated. Magnetic measurements were done on these sample oxides (including single crystals of CaRuO 3 ) by using a magnetic balance technique.…
The processes that occur at grain boundaries during high temperature creep at low strain rates have been studied by scanning electron microscopy of a fiducial grid and by transmission electron microscopy mainly of pure aluminium. These and other observations are interpreted in terms of a dislocation model for grain bo…
LALS is a computer program for the refinement of molecular structures. It is primarily intended for helical macromolecules but has applicability in other fields. The refinement uses as data, X-ray structure factors, usually from fibre diffraction studies, and/or stereochemical information, including a comprehensive sh…
Data are presented on the thermomechanical response and electrical conductivity of two commonly used epoxy materials, Narmco 5208 resin and RB 398 adhesive, as a function of increasing temperature. The overall conformity of the results shows that the second-order Ehrenfest-type glass transition temperature, designated…
Some electrochemical aspects of the stress corrosion cracking (SCC) behavior of HT 80 steel in a liquid ammonia (99.9%) at 30°C have been studied. The measurement of electrode potential was made in reference to the Pt electrode. The results obtained are as follows:(1) In liquid NH3 and NH3+0.5 wt%H2O, the “as-dipped”…
Potassium nutrition of tobacco on a potassium fixing alluvial soil A field experiment was conducted to study the effects of K‐fertilization on potassium uptake by tobacco and the K‐dynamics in an alluvial soil rich in clay and carbonate content. It was observed that the amount of exchangeable potassium and the concent…
The possibility of utilizing cloud point titrations for obtaining theta-cosolvent compositions for PVC solutions was examined for a range of THF—nonsolvent systems. Hansen's1–3 “radii of solubility spheres” were calculated for the various solvents and cosolvent solutions and compared with the observed solubility behav…
Abstract Stress‐temperature curves at constant strain‐rate have been summarized for steady‐state flow conditions of single crystals and polycrystals, and fields of dominating microscopic mechanisms were proposed.
Abstract A method is suggested for the determination of crystal‐solution interfacial tension σ on the basis of data obtained when studying the mechanism of a layer‐wise growth of the soluble‐salts crystals. The essential data for calculating the values of σ by this method are the height and distance of the individual…
The resonance-Raman spectra of the complexes [V(S2C2Ph2)3], [V(S2C2Ph2)3]–, and [M(mnt)3]2–(M = V, Mo, or W) have been recorded with a variety of exciting lines in the visible region. The results of this investigation are combined with an existing molecular-orbital scheme to produce a set of assignments for the electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-temperature relationship for decomposition of sodium bicarbonate from 200 to 600.degree.FCharles C. TempletonCite this: J. Chem. Eng. Data 1978, 23, 1, 7–11Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1 Janu…
Crystals of Cs8Nb22O59 and Rb8Nb22O59are isomorphous. The structures of the two compounds have been determined by direct methods from 967 (Cs) and 791 (Rb) independent reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R 0.043 (Cs) and 0.102 (Rb). Crystals are rhombohedral…
The products obtained by partial chemical reduction of an electrodeposited γ-manganese dioxide have been studied by thermal analysis in an oxygen environment between room temperature and 725 K. Weight loss in the temperature range 430–520 K was independent of sample composition when up to 35 % of MnIV was replaced by…
(1978). The Effect of Fillers on Polymer Properties. Polymer-Plastics Technology and Engineering: Vol. 10, No. 2, pp. 117-129.
1. The acute oral LD50 of poinsettia in Sprague Dawley rats were greater than 25 gm/kg for all plant parts tested. 2. Exaggerated oral dosing over a five-day period with as much as 125 gm/kg total dose did not produce any gross or microscopic pathology in Sprague Dawley rats. 3. A five-day total diet study of poinsett…
Abstract An equation has been derived for the development of crystallinity from heterogeneously nucleated spherulites which impinge with a small number of neighboring but randomly centered spherulites. The crystallization‐time dependence calculated from the equation conforms to an Avrami equation with initial fraction…
Dielectric investigations of the one-layer perovskite-like crystal Bi2TiO4F2 were carried out. It was shown that this material is ferroelectric with the Curie temperature Tc =11°C ± 0.5°C. The ferroelectric phase transition is accompanied by the change of unit cell symmetry C 20 2ν-Imm2 to D 4h-I4/mmm.
Over 90% of failures in buried cables are caused by mechanical damage, and, of the remaining 10%, the cause is unknown. Trees have been found in the polyethylene insulation of cables that have failed in service, but nobody has established that treeing was the actual cause of failure. But, because of the increasingly s…