Materials Literature
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On the basis of the characteristic enthalpy changes associated with glass transformation, the glass transition (Tg) in gelatin can be detected readily, in addition to the helix-to-coiltransition, by difTerential scanning calorimetry, and the effects of water content on these transitions can be measured directly. The t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-Phase Oxidation of Phenol in a Rotating Catalytic Basket ReactorHideki Ohta, Shigeo Goto, and Hideo TeshimaCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 2, 180–185Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 Ma…
In 0.25 M potassium acetate (pH 5.2).
The deformation of an ultrafine-grained aluminium alloy has been examined in tension and torsion. At grain sizes below about 3 μm the alloy exhibits inhomogeneous yielding but this is absent at larger grain sizes. If the lower yield strength values are plotted versus grain size the strengths are inversely dependent on…
The spectrum of U3+:LaCl3 has been analyzed; 53 crystal states of electronic origin have been identified, many of them accompanied by extensive vibronic sidebands having a recognizable structure similar to that for lanthanide-doped LaCl3. Seventeen energy level parameters were varied simultaneously in a least-squares…
We report measurements of the tilt angle $\ensuremath{\Phi}$ and the planar spacing ${d}_{C}$ near the second-order $\mathrm{Sm}C\ensuremath{-}\mathrm{Sm}A$ transition in $4\ensuremath{-}n\ensuremath{-}\mathrm{pentyl}\ensuremath{-}\mathrm{phenylthiol}\ensuremath{-}{4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\math…
The spin dynamics of the transition-metal ferromagnets nickel and iron are investigated within the framework of the itinerant theory of magnetism. The theory is developed in terms of a generalized random-phase approximation which incorporates the band and wave-vector dependence of relevant interaction matrix elements.…
The synthesis and properties of one-dimensional conductors are of topical interest. It has now proved possible to synthesize (1) and a polymer (2), in which PcFe and pyrazine groups alternate. The physical properties of (2) indicate extensive electron delocalization over the pyrazine bridges.
The major cytotoxic activity of crude extracts of Nectandra rigida Nees is due to dehydrodiisoeugenol,the sample isolated being slightly enriched in the dextrorotatory enantiomer. Galgravin and two new tetrahydrofuranoid lignans, nectandrin A and nectandrin B, were also isolated and characterized along with small quan…
Localized states are characterized kinetically (via rate constants) and separated into transport states and traps according to whether the states actually enable transport (mobilize a particle) or disable transport (or act as temporary immobilizers). A technique is developed for effecting the separation uniquely. It i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDSC on Freeze-Dried Poly(methyl methacrylate)-Polystyrene BlendsAllan R. Shultz and Ann L. YoungCite this: Macromolecules 1980, 13, 3, 663–668Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/do…
This paper discusses carbonate and sulfate formation in the Forties field and some of the laboratory inhibitor-selection techniques used to evaluate scale inhibitors for field use in the Forties injection and production systems. Two chemical treatments for stimulation injection wells also are described. Introduction P…
The minimum angles of taper that can in theory be formed to various preparations were established for representative dental preparations and operating distances. These values were compared with the taper of dental preparations formed both under laboratory conditions and in clinical practice, the latter by measurement…
Data from 145 recent impact tests of reinforced concrete walls with solid and pipe missiles are used to assess the accuracy of several empirical formulas. For solid missiles, penetration depths greater than six-tenths the missile diameter are predicted by the NDRC formula to within —25%, scabbing is predicted equally…
Abstract Soil from the surface horizon of a highly weathered soil (Acrohumox) from tropical Queensland was mixed with crushed basaltic cinders and incubated in a moist condition for 12 months in the laboratory. The cation exchange capacity (CEC) increased from 9 to 14 meq/100 g in direct relationship to the rate of ap…
SUMMARY Despite the important contribution of high‐resolution electron microscopy to materials science, the use of computer simulation as a reliable tool for the interpretation of the structure images in complex crystals or disordered solids has been limited seriously by the high computer demands of the available comp…
The effect of gamma ray irradiation on the density, refractive index, thermal expansion, and helium permeability of a variety of commercial borosilicate glasses has been measured for doses between 108 and 1011 rad. The radiation-induced densification of these glasses for a constant dose can vary by as much as factor o…
This article reviews the preparation and properties of silicon–germanium alloys, mentions some recent developments in their technology, and assesses their potential for further improvement as high temperature thermoelectric materials.
Abstract Greenhouse and laboratory experiments conducted with a clayey kaolinitic isohyperthermic Typic Haplustox from the Cerrado region of Brazil showed that CaCO 3 , CaSiO 3 , and previous P applications decreased P fixation and improved cation retention properties. The amendments were added at rates to replace 1 o…
Abstract Four Indian varieties of silk viz., Mulberry, Tasar, Eri, and Muga, have been investigated by x‐ray diffraction and infrared spectroscopy. The hydrolysis for Mulberry was carried out using 6 N HCI at 40°C, whereas the other wild varieties of silk were hydrolyzed partially using 8 N HCI at 40°C. The x‐ray orde…