Materials Literature
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A small grain of iron catalyst, used in the synthesis of ammonia, has an external surface of about I cm 2 /g, but it has an internal surface of 100,000 cm 2 /g. Since catalysis takes place on the surface, obviously the surface in the pores is of vital importance. But not all pores are of equal importance; in very narr…
The encountering ferroelectric polarization is formed by cooling SbSI crystals from the ends and also by applying encountering electric fields. The screening space charge increases the electrical conductivity of crystals normal to the c-axis.
The influence of various factors on the formation rate of peroxide-like impurities in polyethylene glycols was studied. Conditions of high temperature and agitation increased this rate. Varying formation rates were found with glycols from different manufacturers and this seemed to be related to the initial level of pe…
Static strain waves appear for cholesteric liquid crystals confined between parallel plates treated to give homeotropic boundary conditions whenever the plate spacing exceeds a critical thickness which depends upon applied magnetic or electric fields. The periodicity of the strain wave varies with plate spacing and fi…
We utilize the concept of electron-phonon dominated optical conductivity and the Drude theory of optical properties of metals, as applied by Ujihara1, and the theory of melting in simple metals of Omini,2 based on the Percus-Yevick3 collective coordinate (liquid phonon) theory of simple liquids, to calculate the optic…
The plasma flame coating of alumina baloon on the metal substrate was used to prepare η alumina. The formation of η alumina from the molten state was discussed on the schematic P-T diagram.This phenomenon can be understood only through the hypothetical melt which consist of prototypes of η alumina with the octahedral…
Electron microscope observation is carried out in and around {1\bar102} twins in lightly-stretched magnesium foils. Stacking faults are observed mainly in the twins and sometimes in the matrix around the twins. Identification of dislocations by two-beam bright-field electron microscopy shows that during deformation ma…
Abstract The thermal and thermo‐oxidative degradation of reprecipitated and “as received” samples of different types of high‐density polyethylene (HDPE) have been studied. Two of the samples were of conventional Phillips type, being essentially linear and having one vinyl group per molecule. The other two HDPE's were…
The various electrochemical techniques for predicting galvanic corrosion behavior of metals are described. Each method is evaluated on the basis of practicality using specific galvanic couples as examples. The paper describes some serious shortcomings of the existing techniques and warns of the dangers of their improp…
Principles environments ferrous metals ferrous metals (continued) rarer metals the noble metals high temperature effect of mechanical factors design and economic aspects of corrosion cathodic and anodic protection pretreatment and design for metal finishing methods of applying metallic coatings protection by metallic…
The presence and nature of the film produced on a gold electrode by polarisation in 1.0 mol dm–3 chromic acid and 1.0 mol dm–3 chromic acid + 0.01 mol dm–3 sulphuric acid solutions, over a wide range of electrode potentials has been demonstrated by X-ray photoelectron spectroscopy. The relative amounts of the differen…
The localization of plastic deformation into a shear band is discussed as an instability of-plastic flow and a precursor to rupture. Experimental observations are reviewed, a ge~eral theoretical framework is presented, and specific calculations of critical conditions are carried out for a variety of material models. T…
Results are presented for a theoretical and experimental investigation of magnetic platelets introduced into a nematic liquid crystal. The equilibrium positions of the platelets and nematic director as a function of applied field are calculated and compared with experiment.
The effect of quenching and tempering structure of various carbon steels on the diffusivity and solubility of hydrogen were studied at room temperature by using an electrochemical permeation technique. The minimum diffusion coefficient is obtained when the steels are in the as-quenched state; i.e, in a martensitic str…
Emission spectra have been recorded of polycrystalline samples of Na7EuIIIW10O35·xH2O and K13EuIII(SiW11O39)2·xH2O. The fluorescence of the europium ion can be efficiently pumped via the internal states of the tungstate groups. The cluster maintains its integrity in neutral aqueous solution, in which the europium ion…
SrTiO3 crystals have been prepared by flame-fusion growth and from KF-LiF and K-Li-borate fluxes. The crystals are characterized by EPR, absorption spectra, chemical analyses and 7-rocking curves, and the structural perfection of flame-fusion and flux-grown crystals is compared.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitric oxide complexes of manganese and chromium tetraphenylporphyrinB. B. Wayland, L. W. Olson, and Z. U. SiddiquiCite this: J. Am. Chem. Soc. 1976, 98, 1, 94–98Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Published inissue 1 January…
An orthogonality relation for the Rayleigh-Lamb modes of vibration of an isotropic, homogeneous, elastic plate is derived. Subject Classification: [43]40.24.
Thin‐film solid‐state galvanic cells were fabricated using Pb metal as anode, as electrolyte, and as cathode. Because of the high resistivity of , it was codeposited with to form a more conductive mixed cathode layer. Such cells developed open‐circuit voltages from 0.61 to 0.70V, compared to 0.70V theoretical. Cells w…
A survey, comparison, and critical analysis is presented of data compiled from the scientific literature concerning diffusion in copper alloy systems involving elements in Group VII (Co, Fe, Ni, Pd, Pt, Rh, Ru). Here the term ’’copper alloy system’’ is interpreted in the broadest sense. For example, the review of diff…