Materials Literature
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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…
X-ray diffraction photographs of protein single crystals have been obtained using synchrotron radiation produced by an electron-positron storage ring. The diffracted intensities observed with this unconventional source are a factor of at least 60 greater than those obtained with a sealed x-ray tube using the same crys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHard Block Length Distribution in Segmented Block CopolymersL. H. Peebles Jr.Cite this: Macromolecules 1976, 9, 1, 58–61Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Published inissue 1 January 1976https://pubs.acs.org/doi/10.1021/ma60…
The α—β transition in the cristobalite phases of SiO2 and AlPO4 has been studied using X-ray powder diffraction. The transitions show marked hysteresis but also occur over a range of about 20°C in which the α and β phases coexist. The lattice parameters show a smooth and slow variation with temperature for each phase…
The Stokes’ flow problem is considered for micropolar fluids in which the obstacle has an axis of symmetry, and the flow at distant points is uniform and parallel to this axis. A general expression for the drag is derived by using the arguments involving an axisymmetric point force and application is illustrated for t…
The strength of BaTiO 3 which had been hot‐pressed to ∼99% of theoretical density and tested above the Curie temperature was—9000 psi greater than at room temperature. This measured difference in strength is attributed to internal stress from the cubic→tetragonal phase transformation. Correction of measured strength t…
Abstract —Direct photooxidation of cyanine dyes was found to be markedly enhanced by formation of hypsochromically shifted (H) aggregates. Singlet oxygen was found to attack many cyanines possessing low oxidation potentials with rate constants in excess of 10 8 t mol ‐1 s ‐1 . Singlet oxygen attack on 3,3′‐diethyl‐8,1…
Phase equi ibria in the system MgO‐MgC 2 ‐H 2 O at 2°±3°C were determined and the reactions by which the equi ibrium phases, 5Mg(OH) 2 MgC 2 8H 2 O and 3Mg(OH) 2 MgC 2 8H 2 O, deve op were studied by X‐ray diffractometry. As reactive MgO is disso ved by magnesium ch oride so utions, a thixotropic suspension is convert…