Materials Literature
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In connection with freezing, dynamical behaviour of (metastable) liquids is studied based on the nonlinear diffusion equation (ND eq.) derived in a previous paper. From the ND eq., an H -theorem for the free-energy functional \(\mathscr{F}(N(\mbi{r},t))\) of Brout is derived in the form \(\mathrm{d}\mathscr{F}(N(\mbi{…
Magnetoelastic interactions in amorphous rare earth-3d transition metal thin films are analysed. The calculations are based on the anisotropic pair ordering model. Pair energy is expressed in the pseudodipolar form. It has been shown that magnetoelastic tensor consists of two parts:isotropic and anisotropic. The case,…
As in chiral nematic liquid crystals, one of the most striking optical properties of chiral smectic C liquid crystalline phases is the selective reflection of certain wavelengths of light. This Bragg-like scattering is a direct consequence of the periodic nature of the helical structure of these phases. In chiral nema…
Thin films of iron were prepared by condensation from the vapour phase onto a liquid helium-cooled substrate. The 'as deposited' films possessed large resistivities similar to that of liquid iron and were ferromagnetic. The extraordinary and ordinary Hall coefficients of the films were measured and were found to be of…
A computational method to deduce depth profiles of elements from the dependence of the spectral intensity on angle has been formulated. The method is formulated as the minimization of the sum of the squares of the differences between experimental and theoretically expected relative intensities at all data points subje…
Rotational power losses per cycle Pr/f have been measured as a function of rotational frequency f, between about 0 and 25 Hz, on grain oriented and isotro pic 3% SiFe, under different magnetization conditions, up to almost complete saturation. Loss measurements were performed from the rate of change of the angular vel…
The successive phase transitions in K 2 PbCu(NO 2 ) 6 have been studied by precise X-ray and neutron measurements. In phase II, we have observed the satellite reflections at ( H ±0.416, K ±0.430, 0) around each fundamental Bragg reflection. In phase III, we have observed the superlattice reflections, instead of the sa…
Solution experiments were conducted in which basic aluminum sulfates were precipitated from dilute solutions of various concentrations of sulfate and potassium at different pHs. Aging of precipitates at 50°C for 18 weeks resulted in crystalline precipitates of gibbsite, basaluminite, alunite, or mixtures of these mine…
Single crystals of activated with Nd 3+ were studied by high resolution selective site laser spectroscopy. The optical properties of Nd 3+ ions located at various inequivalent sites were correlated with Nd 3+ site symmetries obtained from electron spin resonance (ESR) measurements and also with the polarizations predi…
Results from isothermal ageing of a commercial nickel-base alloy are presented. Particle sizes are determined by electron microscopy. The particle coarsening is found to obey the Lifschitz-Wagner theory. The volume fraction of γ′ particles is 0.15. The proof stress is determined for a series of ageing times. The Taylo…
We give the experimental evidence of first order magnetization processes in a W- -type hexaferrite single crystal having composition BaZn1.38Co.62Fe16O27. The nature and the characteristics of the transition change with temperature from 77 to 250°K. The observed effects are discussed on the basis of a phenomenological…
Glauconite dates obtained by conventional K-Ar and 40 Ar/ 39 Ar age spectrum techniques from Palaeocene horizons in Kent are examined against a Palaeogene K-Ar time-scale derived from the Tertiary igneous rocks of the North Atlantic region. Isotope ratio plots (correlation diagrams) are used to analyse and test the va…
Résumé Pour les hydrates à ‘deux couches’ des vermiculites issues des phlogopites 1 M, saturées par Li, Na, Ca, Mg ou Ba, nous avons rencontré quatre modes d'empilement des feuillets. Un seul (V III ) présente une structure ordonnée tridimensionnellement. Les trois autres (V I , V V et V VII ) sont des structures semi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreduction of tetraphenylporphyrins by amines in the visible. Photochemical syntheses of reduced tetraphenylporphyrins and the mechanism of photoreductionY. Harel and J. ManassenCite this: J. Am. Chem. Soc. 1978, 100, 19, 6228–6234Publication Date (Print):September 1, 19…
Al-5%Mg, Ag, Au, Cu-l0%Ni, and Ni in the form of bars have been deformed to large strains by rolling at 20°C, and their microstructures determined by thinfoil transmission electron microscopy. Tensile tests have been carried out on the rolled specimens, and from the results obtained stress/true rolling strain curves h…
Coldworking the material near the edge of a fastener hole is one important means of increasing fatigue life. The stresses, strains, and location of the boundary between elastic and plastic regions have been analyzed by various theoretical studies. The purpose of this research is to experimentally evaluate the theories…
Abstract The action of solid surfaces coated with monomolecular films of amphiphilic compounds (especially lecithins) on adjacent liquid crystal phases resulting in an uniform homeotropic orientation has been investigated. The quality of orientation was found to be effected by molecular structure of the amphiphilics a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of (2R,4'R,8'R)-.alpha.-tocopheryl acetate (vitamin E acetate) using [3,3] sigmatropic rearrangementKa-Kong Chan, Anthony C. Specian Jr., and Gabriel SaucyCite this: J. Org. Chem. 1978, 43, 18, 3435–3440Publication Date (Print):September 1, 1978Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Three-Dimensional Elastic Constants of Polymer Crystals. 1. Method of CalculationKohji Tashiro, Masamichi Kobayashi, and Hiroyuki TadokoroCite this: Macromolecules 1978, 11, 5, 908–913Publication Date (Print):September 1, 1978Publication History Published onli…
Several types of insulator strings covered with ice or snow were tested for ac, dc, and switchings impulse voltages. Reductions of flashover voltage were noted for all voltage types. These reductions were more acute on ice or snow covered insulator strings than on salt contaminated strings when deposits of salt were l…