Materials Literature
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Abstract When the dusty gas diffusion equation is applied to materials containing pores with radii below 50 Å, the observed diffusion behavior in these smaller pore systems can be quite different from that predicted by the equation. Higher temperatures and in some cases higher pressures tend to lessen the deviations b…
Abstract The structures of two new norditerpenoid dilactones, nagilactone E and F, are proposed. A dual biological activity of nagilactones (inhibitory and promotive) for plant growth is also reported.
The DC electrical breakdown of SF6 gas at extra-high- voltages was studied experimentally in coaxial systems of moderate size. The results were compared to a similarity relationship of electric stress for breakdown based on ionization of the gas. For laboratory-clean systems, theory and experiment agree when the macro…
Abstract The self heating characteristics of a series of activated carbon samples have been studied in relation to their chemical/physical properties. It appears that ease of self heating is related to the oxygen content of the carbon on a dry ash free basis, and from this it can be shown that all carbons manufactured…
Abstract Die Umströmung von einzelnen Kugelblasen mit innerer Zirkulation wurde theoretisch untersucht. Die Differentialgleichungen, die das Geschwindigkeits‐ und Druckfeld in der Umgebung der Blase beschreiben, berücksichtigen die vollständigen Trägheitsglieder. Die Rechnungen haben ergeben, daszlig; sich die Strömun…
Abstract Resonance absorption spectra of Fe 57 in Co x Zn 1− x Fe 2 O 4 (for x = 0.3, 0.5, and 0.75), in the temperature range from 80 to 700 °K, are discussed. The modulated lineshapes of the magnetic hyperfine spectra show features which are characteristic of relaxation effects. The theoretical line shapes, computed…
Abstract The role of mixtures of reactive bromine and phosphorus flame‐retardant polyol intermediates as well as the individual bromine and phosphorus reagents in suppressing combustion of flexible polyurethane foams was investigated by means of the oxygen index flame test and charring techniques. Bromine alone appear…
Abstract Literature relating to the fundamental nature of the fibrous state is reviewed with the goal of illustrating evidence for the existence of a possibly fundamental morphological unit, the elemental microfiber or fibril. Following a short summary of the rather well documented situation in natural fibers, the pro…
The microwave losses in polycrystalline ferrites can be separated into two parts: those associated with resonance (inhomogeneous linebroadening and two magnon processes) and intrinsic losses. In recent years, both types have been studied in great detail. The near-resonance relaxation can be quantitatively explained by…
Abstract The experimental evidence for stress generation in growing oxide scales is briefly summarised, and the origin of these stresses is discussed. The limited experimental data related to oxide adhesion is discussed, and it is concluded that the adhesion between metal and oxide probably involves chemical interacti…
A methyl methanesulfonate sensitive mutant
Abstract The effect of hydrostatic pressure on the crystal structure of PTFE has been studied up to pressures of ca. 25 kbar by x‐ray diffraction. The experimental method uses opposed diamond anvils of small surface area as transmitters of pressure with MoKα x‐radiation propagating through these anvils. A small specim…
Abstract This paper summarises results obtained from a kinetic investigation of the processes occuring during the synthesis of polyethersulphones by reactions such as: magnified image The factors determining the variations in functional group reactivities due to ‘bridge’ effects are described with reference to the rea…
Formulae for the energy, its first derivative with respect to orientation and the line tension of straight dislocations in elastic media of arbitrary anisotropy are developed. The formulae may be evaluated rapidly and precisely by numerical integration, thus avoiding the need for solving a sextic algebraic equation co…
Attainment of equilibrium in plagioclase feldspars is severely hampered by the charge linkage between Ca and Al on the one hand and Na and Si on the other hand (Goldsmith): exsolution is governed therefore by the activation energy for migration of tetrahedrally bonded atoms. Fine-scale intergrowths with structural con…
Mono, di-, and tri-saccharides were found to inhibit collagen fibril formation in vitro without denaturing collagen molecules. Polyalcohols such as ethylene glycol, glycerol, and mannitol also inhibited the fibril formation at higher concentrations than those of sugars. Urea and dioxane also inhibited the fibril forma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance study of copper(II)-ammonia complexes in Y-type zeolitesE. F. Vansant and J. H. LunsfordCite this: J. Phys. Chem. 1972, 76, 20, 2860–2865Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue…
Grain-oriented silicon steel with a high degree of
The complete set of elastic constants in single-crystal gadolinium molybdate (GMO) is presented in a temperature range from 20 to 200 \ifmmode^\circ\else\textdegree\fi{}C. This covers the structural phase transition at 159 \ifmmode^\circ\else\textdegree\fi{}C, below which GMO is both ferroelastic and ferroelectric. El…
The thermal stability of PtSi is an important parameter in large-scale integration processing schemes which involve postmetallization high-temperature operations. For this reason, the effect of annealing on various properties of PtSi has been studied over the temperature range 800–900°C, for 200- and 900-Å-thick PtSi…