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This paper is an analysis of the present knowledge of the formation, removal, and prevention of scale. This examination of the state of the art is presented to indicate the limits of current knowledge of oilfield-scale problems and to instigate additional research into these problems. problems. Introduction This paper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of solvent and substituent effects on the redox potentials and electron-transfer rate constants of substituted iron meso-tetraphenylporphyrinsK. M. Kadish, M. M. Morrison, L. A. Constant, L. Dickens, and D. G. DavisCite this: J. Am. Chem. Soc. 1976, 98, 26, 8387–8390…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriboluminescence and pressure dependence of the photoluminescence of tetrahedral manganese(II) complexesGordon E. Hardy and Jeffrey I. ZinkCite this: Inorg. Chem. 1976, 15, 12, 3061–3065Publication Date (Print):December 1, 1976Publication History Published online1 May 2002P…
The stresses produced in a solid by cavitation generated in distilled water by 10-, 20-, and 30-kHz vibrations have been determined by a transducer technique. The measured stress pulses are attributed to the concerted collapse of the whole cloud of bubbles created by the pressure changes in the water rather than to th…
The effective vibration-rotation hamiltonian for the first excited state of a triply-degenerate vibration in a tetrahedral XY4 molecule is considered, and the principles involved in formulating totally symmetric operators for use in the hamiltonian are reviewed. Explicit expressions are given for all such operators up…
The magnetocrystalline anisotropy of low temperature phase of magnetite (Fe 3 O 4 ) was measured for a monoclinic single phase specimen by using computerized fully-automatic torque magnetometer. The anisotropy is expressed by \begin{aligned} E_{\text{a}}=K_{a}\alpha^{2}_{a}+K_{b}\alpha^{2}_{b}+K_{aa}\alpha^{4}_{a}+K_{…
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A statistical model is described and employed to calculate inverse mean free paths and stopping powers for electrons of energies from a few eV to 10 keV above the Fermi level in Al, Si, Ni, Cu, Ag, and Au. Brief tables of mean free paths and stopping powers for these solids are presented. In some cases graphical displ…
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Values of tensile strength, compressive strength, bending strength, hardness and modulus of elasticity are reported for the shell material of various species of bivalve, gastropod and cephalopod mollusc. Nacre is the strongest structural type, but crossed lamellar structure is the hardest. Possible selective reasons f…
Abstract A three-dimensional reconstruction requires the same integral dose as a conventional two-dimensional micrograph provided that the level of significance and the resolution are identical. The necessary dose D for one of the K projections in a reconstruction series is, therefore, the integral dose divided by K.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and interconversion of the isomeric .alpha.- and .beta.-molybdate (Mo8O264-) ionsW. G. Klemperer and W. ShumCite this: J. Am. Chem. Soc. 1976, 98, 25, 8291–8293Publication Date (Print):December 1, 1976Publication History Published online1 May 2002Published inissue…
Two possible approaches to spectroscopic measurements of the internal temperature of Y 2 O 2 S: Eu are discussed. Methods based on relative Eu 3+ fluorescence line intensities are found either to be insufficiently sensitive or to suffer from unavoidable experimental difficulties. The method which is adopted exploits t…
Abstract A reproducible method for obtaining water‐soluble chitin and a relationship between solubility and degree of deacetylation of chitin were studied. It was found that the regenerated chitin isolated at low temperature from an alkali chitin solution left at 25°C for 48 to 77h showed very good solubility in water…