Materials Literature
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Two types of methods have been previously used to relate the macroscopic decay of polarization in a dielectric specimen to a microscopic decay function defined in terms of molecular motions. The first is based on Kubo's theory of non-equilibrium statistical mechanics combined with Kirkwood's theory. The second is base…
A calculation is presented which describes the splitting of doubly degenerate electronic states of tetragonal and trigonal centres in cubic crystals by an applied uniaxial stress. It is shown that the shift and splitting of the states may be expressed in both cases in terms of four independent parameters. The approach…
Imperfection sensitivity of eccentrically axial and ring stiffened cylinderal shells under axial compression and hydrostatic pressure
Abstract Poly (vinyl chloride) (PVC) holds a major position in the consumption of thermoplastics. In the United Kingdom, from humble beginnings, 500 tons in 1941, production has increased rapidly through the last ten years to the 200,000 ton mark in 1966 and now accounts for 30 per cent of the total thermoplastics. Th…
The thermal decomposition process of zirconium sulphate tetrahydrate has been studied. Dehydration, which takes place via a crystalline monohydrate phase, is accompanied by the loss of small amounts of sulphuric acid apparently resulting from internal hydrolysis of the compound. This process gives a non-stoicheiometri…
Abstract Aromatic polysulfonamides have been prepared by solution polycondensation of aromatic disulfonyl chlorides and aromatic diamines with a suitable acid acceptor in such solvents as N , N ‐dimethylacetamide and tetramethylenesulfone. The highest molecular weight polymers were obtained by using 2,6‐dimethylpyridi…
Internal stresses of dislocations interact in ferromagnetic crystals with the spontaneous magnetization through the magnetoelastic coupling energy. The magnetic free energy (MFE) of a straight dislocation line is calculated by means of Brown's micromagnetic equations. This energy corresponds to a magnetostrictive cont…
Stripe domains have been observed in Ni–Fe films having positive, zero, or negative magnetostriction and with either tensile or compressive stress. By using the model of Saito et al. and assuming their anisotropy constant K is attributed to both the shape anisotropy K0 and the magnetostrictively induced anisotropy Ks,…
Abstract Developments in the rubber reclaiming industry are closely related to those in the rubber industry in general. The vulcanized rubber produced by the latter becomes in time the raw material used by the former. Although not superficially obvious, there has been considerable change in the reclaiming industry in…
The feasibility of optical beam-operated magnetic storage systems is assessed. Recent advances in laser technology and in transparent magnetic materials are described along with methods for writing and reading information. In the writing process, thermomagnetic recording on thin films is considered and the writing spe…
Single crystals of Ni1−pZnpFe2O4 (p=0.20 and 0.65) were prepared from a melt in a PbO:B2O3 flux. The anisotropy constant K1 was deduced from torque measurements in a (100) plane. | K1 | increases linearly with p at low temperatures. Combining the results with data on p=0 and p=0.33 from the literature, one can represe…
The effect of composition on the first-order transformation from triangular into collinear antiferromagnetic structure (AF-AF transformation) occurring in ordered Mn3Pt has been investigated on ternary Mn3Pt1−xRhx and binary Mn3+yPt1−y alloys using x-ray and neutron-diffraction methods. On increasing the concentration…
The ion-binding capacity of highly purified reconstituted calf-skin collagen, and the effects of these ions on the precipitation and solubility of the collagen, were studied with a variety of salt solutions at ionic strength 0.16 and pH7.4. Only a small percentage of the total theoretically available anionic and catio…
In the hydrostatic theory of liquid crystals, we characterize those orientation patterns which may occur, in the absence of externally applied body forces, no matter what the form of the stored energy function may be. It turns out that there are three types of such patterns. In one, the orientation vector is perpendic…
Abstract A study was made of the influence of selected chain modifiers on both the molecular weight of grafted polyacrylonitrile and the grafting frequency of the starch–polyacrylo‐nitrile graft copolymer. Gelatinized wheat starch was used with ceric ammonium nitrate as the initiator. The organic chain modifiers inves…
In dc cables the resistivity of the insulation is a very important parameter, as it determines the stress distribution and the power losses in the insulation. This paper gives the results of several tests on plane capacitors, from which the steady-state resistivity of four different kinds of paper and impregnants appe…
Abstract Elastomer processing operations are discussed and classified as unit operations. The theory of nonlinear viscoelasticity is applied to processing unvulcanized amorphous rubber and the significance of the maximum relaxation time τ m is emphasized.
Pronounced temperature-dependent transfer of excitation from the Er3+ laser pump levels to lower levels of Er3+ was observed in CaF2:ErF3 single crystals at ErF3 concentrations exceeding 12.5 wt %. Transfer of excitation from Er3+ to Tm3+ occurred when TmF3 was included as a second active constituent of the crystals.…
The reactions of the OH radical with H 2 S and SH ⊖ are very fast (k = 1.1·10 10 and 5.4·10 9 mole -1 liter sec -1 , respectively). The hydrated electron reacts with H 2 S (1.1·10 10 ) but does not react with SH ⊖ . The rate constant of the reaction CNS+SH ⊖ CNS ⊖ +SH was found to be equal to 9.8·10 8 . Species absorb…
We have investigated the temperature-dependence of the magnetic moment of Cr3P, Mn3P, Fe3P and Ni3P including solid solutions of these compounds with each other. These measurements indicate Ni3P and Cr3P have a temperature-independent Pauli-type paramagnetism. Mn3P is antiferromagnetic (TN≈115°K) with a moment of 1.68…