Materials Literature
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Summary The mineralogy of the processes leading to the formation of soils by the tropical weathering and leaching of rocks is reviewed, and illustrated by the results of an investigation into the formation, mineralogy and plasticity properties of some soils formed on basalt, granite, shale and sandstone in west Malays…
The 1000-Hz 300\ifmmode^\circ\else\textdegree\fi{}K dielectric constants of some alkali halides were measured to an accuracy of 0.01% by the method of substitution. Reproducibly different values for various crystals of the same type were obtained which varied beyond the experimental error. The ranges of results for va…
It is shown theoretically that the orientation pattern of cholesteric liquid crystals can be less stable in electric and magnetic fields than was previously thought. Specifically, the planar texture between two conducting glass plates may become unstable at voltages much below those needed to unwind the cholesteric he…
We present some measurements on the instability threshold of $p\ensuremath{-}\mathrm{m}\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{o}\mathrm{x}\mathrm{y}\ensuremath{-}n$, $p\ensuremath{-}\mathrm{b}\mathrm{e}\mathrm{n}\mathrm{z}\mathrm{i}\mathrm{l}\mathrm{i}\mathrm{d}\mathrm{e}\mathrm{n}\mathrm{e}$ butylaniline (MBBA) under…
The nature of the emission from central metal ions in complexes can be controlled by chemical alteration of the ligands. For iridium(III) species three types of emission have been observed, each originating from a different and orbitally identifiable excited state. Principles useful for designing new luminescent mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of three-dimensional structure in proteins. I. Rapid nonenzymic reactivation of reduced lysozymeDonald B. Wetlaufer and V. P. SaxenaCite this: Biochemistry 1970, 9, 25, 5015–5023Publication Date (Print):December 8, 1970Publication History Published online1 May 2002…
(ReivedJune181970
The Molten Salt Reactor Experiment has been refueled with an enriching salt concentrate, 7LiFUF4 (73 to 27 mole%). Sixty-three kilograms of this was prepared in a shielded cell in the Thorium-Uranium Recycle Facility at Oak Ridge National Laboratory. The preparation process involved reducing 233UO3 to UO2 by treatment…
This paper describes the mineral cerotungstite found as a secondary crystallization in some tungsten deposits in northern Rwanda and in the Kigezi District of south-western Uganda. Cerotungstite represents a cerian analogue to yttrotungstite known from the Kramat Pulai tin deposit in Malaysia. Therefore, some new data…
Dislocation structures of (001) sections of natural crystals of barite have been studied by x-ray diffraction topography. Pure edge dislocations along [100] with Burgers vector b = b [010], and pure screw dislocations with Burgers vector b = (a + b) [l10] were found. Mixed dislocations which were either predominantly…
At 4 and 77 K, photoluminescence from nominally undoped and 0.0025% Cr-doped CaTi${\mathrm{O}}_{3}$ shows identical spectra in the infrared with an intensity ratio of 1:2. The emission is attributed to the $^{2}E\ensuremath{\rightarrow}^{4}A_{2}$ transition of the ${\mathrm{Cr}}^{3+}$ ion at a ${\mathrm{Ti}}^{4+}$ sit…
1. Retinol and stilbene are both isomerized when they are illuminated anaerobically in the presence of flavins. 2. Triplet quenchers (e.g. oxygen, potassium iodide and paramagnetic ions) inhibit the reaction more efficiently than they quench flavin fluorescence. At 77 degrees C in a diethyl ether-isopentane-ethanol (5…
Thermal expansion characteristics of a group of polycrystalline graphites have been measured to 2400°C by a method which permits acquisition of meaningful expansion data without resorting to reference standards. Direct measurements on specimens while in the furnace were accomplished by using two 8-in. focal length Gae…
An hour after the damage of the shell in Euplecta indica (Pfieffer) a thin, structureless, basophilic regeneration membrane appears. Thereafter, a large number of amoebocytes precipitate on this membrane. Soon these break up and contribute their cytoplasmic contents to the regenerate. This is positive for glycoprotein…
The influence of aluminum-containing Lewis acids, e.g., AlCl3, AlEtCl2, AlEt2Cl, AlEt3, and AliBu3, on polyisobutylene, isobutylene-isoprene copolymer (butyl rubber), and chlorinated butyl rubber has been investigated in nonpolar and polar solvents at various Lewis acid concentrations in the temperature range -10 to -…
Comparisons of theoretical electron-bremsstrahlung cross sections for Al and Au from the work of Brysk, Zerby, and Penny are made with new experimental values at incident-electron energies of 0.05 and 0.20 MeV. Photon energies of 10, 20, 30, and 40 keV are considered in the angular region from 10 to 120 deg at 0.050-M…
Two-dimensional numerical analyses have been performed of projectile impacts at 15,00020,000 fps into finite laminated targets consisting of plastic layers backed by aluminum substrates. These analyses used the SHAPE code, with a hydrodynamic-elastic-plastic distortional model. Three solutions are discussed. The first…
Tumble-drying from the wet fabric state is shown to be a reasonable means of fully-relaxing rib structures. By this technique, an approximate discrimination can be made between dimensional changes due to relaxation and felting of all- wool rib structures. Upon washing from the fully-relaxed state, untreated fabrics fe…
Abstract Determination by X-ray diffraction of the relative proportions of component minerals in sediments and rocks involves comparison of the integrated intensity of selected reflections from component minerals in the unknown mixture to standard calibration curves. Although the analysis may be rapid and precise, a n…
The lattice parameter of the α copper-titanium solid solution was measured as a function of titanium concentration. The value of aO increased non-linearly from 3.6150 Å for pure copper to 3.6421 Å for an alloy containing 7.6 at.% titanium. The rate of change of the parameter increased up to 3 at.% titanium and decreas…