Materials Literature
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For large reaction rate constants and negligible change in solution composition, the performance of a porous electrode with solid reactants is governed by the ohmic potential drop within the matrix and solution phases. The cell potential changes with time, at constant current, as the reactants are consumed. Equations…
A new algebraic expression has been established for the critical sparkover voltage (CSOV) afair insulation submitted to positive switching impulses. By using the concept of the gap factor, the expression is found to be valid for all practical gap configurations in the distance range 1 to at least 30 m. Based on these…
Scaling of copper heat exchanger tubes has been studied under conditions that promote rapid and severe scaling. Artificially hardened water of high dissolved and suspended solids is recirculated through a heated test section operated at constant steam temperature. The effects of flow velocity, tube diameter, and bulk…
Generalized x-ray scattering factors for atoms (pseudoatoms) in diatomic molecules are determined from a finite multipole expansion of the charge density about each nucleus. The Fourier–Bessel coefficients of the pseudoatom radial density functions are determined by a least squares fit to the molecular form factor. Al…
To provide engineering data useful in the design, manufacture, and operation of seamless pressure vessels, extensive tests have been conducted in hydrogen at pressures ranging from 3000 to 14,000 psi (21 to 97 MN/m2) with precracked specimens of steels having a wide range of mechanical properties. The critical stress-…
Abstract Tetracycline antibiotics continue to play an important role in human and veterinary medicine and in animal nutrition. The classical tetracyclines obtained by fermentation have been supplemented by products of partial synthesis which provide, in particular, the advantages of better pharmacokinetic properties a…
Since the experimental demonstration of the one dimensional metallic state, the study of one dimensional conductors has flourished. Michael Rice outlines recent work in this branch of solid state physics and discusses the 'charge density wave' state
The magnetization and high-field susceptibility of disordered cold-worked Fe 1-c Al c alloys with 0<c<or=0.51 have been determined at 4K in fields up to 150 kOe. The well known initial magnetic behaviour is found to extend to about c approximately=0.25. At higher c values the mean atomic moment decreases faster than a…
Abstract The unit cell of poly(tetramethylene terephthalate) is triclinic with parameters a = 5.96 Å, b = 4.83 Å, c (fiber axis) = 11.62 Å, α = 115.2. β = 99.9, and γ = 111.3°; space group P 1 , calculated crystalline density 1.41 g/cc. The plane of the benzene ring is found to be inclined by about 15° from the fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-independent method for dissecting contact and dipolar NMR shifts in lanthanide complexes and its use in structure determinationCharles N. Reilley, B. W. Good, and J. F. DesreuxCite this: Anal. Chem. 1975, 47, 13, 2110–2116Publication Date (Print):November 1, 1975Pu…
The importance of diffusion was investigated under potentiostatic dissolution conditions with wire electrodes contained in inert supports. The artificial cavities created simulated localized corrosion conditions. Current‐time behavior at voltages in excess of the critical pitting potential [>0.5V (SCE)] was examined f…
Abstract This work was undertaken to study the effect of silica filler structure on the effective crosslink density and on mechanical properties. Vulcanizates of silicone, SBR, and EPM were included in the work. A compression modulus method was used for crosslink density determination. Samples were swollen prior to me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron diffraction study of the structure of Zeise's salt, KPtCl3(C2H4).H2ORichard A. Love, Thomas F. Koetzle, Graheme J. B. Williams, Lawrence C. Andrews, and Robert BauCite this: Inorg. Chem. 1975, 14, 11, 2653–2657Publication Date (Print):November 1, 1975Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Energy and Configurational Statistics of PolypropyleneU. W. Suter and P. J. FloryCite this: Macromolecules 1975, 8, 6, 765–776Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 November 1975https://pubs.a…
Most molecular theories of nematic liquid crystals assume that the constituent molecules are cylindrically symmetric. However, although this may be a useful approximation the molecules of real nematogens are of lower symmetry; here we develop a theory for an ensemble of such particles based on a general expansion of t…
B T M Willis and A W Pryor London: Cambridge University Press 1975 pp xvi + 280 price £9.50 The scope and emphasis of this book are well described by the titles of its three main sections: theory of lattice dynamics, effect of temperature on Bragg intensities and thermal diffuse scattering. From the point of view of t…
Ionic fluxes in Na channels of myelinated axons show ionic competition, block, and deviations from simple flux independence. These phenomena are particularly evident when external Na+ ions are replaced by other permeant or impermeant ions. The observed currents require new flux equations not based on the concepts of f…
The direct transition behavior among the graphitic (hBN), wurtzitic (wBN), and zincblende (zBN) crystal forms of boron nitride is investigated as a function of temperature for pressures up to 130 kbar. At pressures in the 45 to 70 kbar range, direct transformation of both the hBN and wBN forms to the zincblende form a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of cadmium- and silver-oxygen surfacesJ. S. Hammond, S. W. Gaarenstroom, and Nicholas. WinogradCite this: Anal. Chem. 1975, 47, 13, 2193–2199Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Publi…
Concentration profiles of Al 2 O 3 in diffusion couples made from sapphire and fused silica were used to determine the stable equilibrium phase diagram of the system SiO 2 ‐Al 2 O 3 . The intermediate compound mullite, 3Al 2 O 3 · 2SiO 2 , melts incongruently at 1828°± 10°C; its stable solid‐solution region ranges fro…