Materials Literature
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Abstract An old problem is addressed being the description of the dielectric response of electrons near the surface of an infinite half space to perturbing potentials and external charges. Taking into account spatial dispersion, expressions are derived for the screened potential and the inverse dielectric function wit…
Commercial manganin stress gauges are used in planar impact experiments to determine spall strengths of variously heat-treated 2024A1 specimens. A one-dimensional Lagrangian code is used to find the best fit of calculated versus experimental stress histories by varying the spall strength in the code and using a simple…
Tin oxide thin films were exposed to an rf excited hydrogen plasma (100 mTorr) for various times. The plasma system was operated in a self-biased mode. X-ray photoelectron spectroscopy analysis of vacuum transferred samples shows that SnO2 is reduced. A thin self-limiting layer of elemental Sn forms on the reduced fil…
In view of the practical difficulties already encountered plus those anticipated in the implementation of many-body hydrodynamic interactions, we examine a number of empirically screened two particle mobility tensors. The empirical screening constant(s), which depend on the dispersion concentration, are adjusted to gi…
Concrete containing both portland cement and fly ash were evaluated to determine the effect of fly ash on air-void stability. Tests indicate that air contents of concrete containing Class C fly ash appear to be more stable than those of concrete containing Class F fly ash. The higher the organic matter content of a fl…
In a study of fouling of heat exchangers, aqueous solutions of CaSO4 and Li2SO4 were circulated through electrically heated tubes at controlled conditions. Measured induction periods and fouling rates of both salts were found to be primarily functions of the supersaturation of the solutions. Secondary correlating para…
Stratified media with periodic surfaces have been used in waveguide-input and waveguide-output couplers and distributed-feedback lasers. We apply the extended-boundary-condition approach to treat the problem of scattering and guidance by stratified media with period surfaces for both the TE and TM polarizations in a u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in multinuclear transition-metal complexes. 3. Synthesis, x-ray structure, and magnetic properties of Cu2L(CH3COO)2.2CH3OH (L2- = anion of N,N'-bis((2-(o-hydroxybenzhydrylidene)amino)ethyl)-1,2-ethanediamine), a one-dimensional Heisenberg antiferromagnet…
Experimental projected ranges of electrons between 20 eV and 10 keV have been correlated by a simple scaling factor to yield 'best-fit' expressions applicable to all media. Extrapolated ranges, R ex (in mu g cm -2 ) may be determined from the expressions given. From an analysis of the transmission curves, the followin…
A design for a palladium diffuser and fuel cleanup system for a deuterium-tritium fusion reactor is proposed. The feasibility of the palladium-alloy membrane method is discussed based on early studies by the authors. Operating conditions of the palladium diffuser are determined experimentally. Dimensions of the diffus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and molecular stereochemistry of metalloporphyrin complexes with cyano ligands. Cyano(pyridine)(meso-tetraphenylporphinato)iron(III) hydrate and cyano(meso-tetraphenylporphinato)manganese(III) chloroform solvateW. Robert Scheidt, Young Ja Lee, Walaipan Luangdilok…
Cubic magnesia‐stabilized zirconia was decomposed by isothermal heat treatment at 1100°C. The mechanical properties, including strength, fracture toughness, and hardness, were measured at various stages during the decomposition process. The strength initially decreased with aging but then recovered almost to its initi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of sugar-substituted cyclic and polymeric phosphazenes and their oxidation, reduction, and acetylation reactionsHarry R. Allcock and Angelo G. ScopelianosCite this: Macromolecules 1983, 16, 5, 715–719Publication Date (Print):May 1, 1983Publication History Published…
The broadening of the $^{57}\mathrm{Fe}$ M\"ossbauer line due to diffusion jumps of the Fe atoms in an Al single crystal has been measured as a function of crystal orientation. The broadening is strongly anisotropic. Theoretical calculations for the broadening using the five-frequency model for the motion of an Fe ato…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlatinum/titanium dioxide (rutile) interface. Formation of ohmic and rectifying junctionsGregory A. Hope and Allen J. BardCite this: J. Phys. Chem. 1983, 87, 11, 1979–1984Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 Ma…
Abstract The objective of this study was to produce corrosion behavior data for each of the commonly used metallic alloys in surgical implants. In addition, by applying the known electrochemical corrosion theory, the study aims to predict the behavior of galvanic couples made of any two of the materials. From this pre…
A model for the low-temperature properties of quasi-one-dimensional superconductors, including quantum effects, is investigated. Both long-range Coulomb effects and scattering by nonmagnetic impurities enhance quantum effects. For strong quantum fluctuations the transition from a fluctuating to a long-range-ordered su…
We report both experimental and theoretical studies of the ${\mathrm{Tl}}^{0}$(1) center in KCl, a center consisting of a neutral Tl atom perturbed by the field of an adjacent anion vacancy. Absorption bands peaking at 1040, 720, 550, and 340 nm are all shown to belong to the ${\mathrm{Tl}}^{0}$(1) center. The relativ…
The method of point-group determination from convergent-beam electron diffraction patterns has been established by Buxton, Eades, Steeds & Rackham [Philos. Trans. R. Soc. London (1976), 281, 171-194]. However, Table 2 given by them is inconvenient for practical purposes, since many symmetries of the dark-field and ±G…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the "pocket" porphyrinsJames P. Collman, John I. Brauman, Terrence J. Collins, Brent L. Iverson, George Lang, Roger B. Pettman, Jonathan L. Sessler, and Marc A. WaltersCite this: J. Am. Chem. Soc. 1983, 105, 10, 3038–3052Publication Date (Pr…