Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular interactions in photochromic spiropyran-merocyanine polymersEfim Goldburt, Felix Shvartsman, Svetlana Fishman, and Valeri KrongauzCite this: Macromolecules 1984, 17, 6, 1225–1230Publication Date (Print):June 1, 1984Publication History Published online1 May 200…
Die ersten N,N′ ‐Dicyanchinondiimine 3 konnten durch Reaktion von Chinonen 1 mit 2 in Gegenwart von TiCl 4 synthetisiert werden. Mit Anwendungen von 3 befaßt sich der nachstehende Beitrag. magnified image
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe discontinuous high-spin (5T2) .dblharw. low-spin (1A1) transition in solid bis(1,10-phenanthroline-2-carbaldehyde phenylhydrazone)iron(II) bis(tetrafluoroborate): hysteresis effects, concurrent crystallographic phase change, entropy of the transition, and effect of press…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectra of an active flavoenzyme: glucose oxidase and riboflavin binding protein on silver particlesRobert A. Copeland, Stephen P. A. Fodor, and Thomas G. SpiroCite this: J. Am. Chem. Soc. 1984, 106, 13, 3872–3874Publication Date (Print):June 1, 1984Pu…
Abstract Middle Jurassic sandstones contain a variety of authigenic clay materials. The origin and distribution of these are related to the influence of several factors, principally depositional pore-fluid chemistry, sandbody geometry and the migration of aggressive fluids. Pore-lining illite, pore-lining chlorite and…
The effects of sulfide contamination (5 ppm) on the corrosion mechanism of Cu‐9.4Ni‐1.7Fe alloy were studied in 3.4 weight percent ( w / o ) NaCl solution at room temperature. Compared to the sulfide‐free solutions ( i ), the thickness of the corrosion products formed in the sulfide solution is much greater, and ( ii…
Abstract This article describes the synthesis of N , N ′‐bis(3,3′‐maleimidophenyl) sulfone (S) and its Michael addition products with (4,4′‐diaminodiphenyl) methane (S‐M), 4,4′‐diaminodiphenyl ether (S‐E), (3,3′‐diaminodiphenyl) sulfone (S‐DDS m ), (4,4′‐diaminodiphenyl) sulfone (S‐DDS p ), (3,3′,3″‐tris aminophenyl)…
We introduce a new experimental technique for directly measuring the energy and momentum scattering rates of hot electrons in dielectrics. Their energy distribution and impact ionization rate at a given electrical field F is a function of \begin{equation*}F^{2} \int^{E}_{0} \gamma_{p}(E)\gamma^{L0}_\mu{ }(E)dE\end{equ…
Il est montre que des techniques de calcul basees sur la minimisation de l'energie cristalline par rapport aux coordonnees atomiques predisent correctement les structures cristallines complexes. Illustration par application a un certain nombre de composes Ti-O et V-O. Deux types de composes sont consideres dans cette…
Abstract An interlaboratory test of the NPL calibration values and methodology for the energy scale of XPS instruments, given in Part 1, has been completed. The NPL calibration values are given for the Cu 3p, Au 4f 7/2 , Ag 3d 5/2 , Cu LMM, Cu 2p 3/2 , and Ag MNN peaks for A1 and Mg Kα radiations to an accuracy of 20…
The first N,N′-dicyanoquinonediimines 3 could be synthesized by reaction of quinones 1 with 2 in the presence of TiCl4. Applications of 3 are discussed in the following article.
Abstract Functionalization of an amorphous ethylene‐propylene copolymer, EPM, has been performed by means of homogeneous grafting reactions of unsaturated molecules such as dibutylmaleate, diethylfumarate, itaconic anhydride, and maleic anhydride, initiated by free radicals. Dicumylperoxide and dibenzoylperoxide have…
The effect of molybdate ion on the corrosion of mild steel in an aggressive, low hardness water was investigated electrochemically. Studies were conducted with molybdate concentration ranging from 50 to 5000 mg/L in waters of pH 3, 5, 7, and 9. The effect of temperature and aeration was also investigated. In deaerated…
The kinetic characteristics and the controlling mechanism of steady-state creep were determined for NC–430 reaction-bonded silicon carbide which was subjected to high temperatures (1848 to 1923 K) and constant compressive stresses (110 to 220 MN/m2). Both as-received and as-crept materials were studied extensively by…
Abstract When H3PW12O40 solution was titrated with Cs2CO3 solution, Cs2PW12O40 was precipitated at the Cs/anion ratio of 0.5–2, while Cs3HPW12O40 was formed at the ratio of 3. Based on these results, the peculiar variation with x and heat-treatment observed for catalytic activity of CsxH3−xPW12O40 has been explained.
Abstract The morphology of isotropic films of poly[ N , N '‐bis(phenoxyphenyl)‐pyromellitimide] was investigated by means of small‐angle x‐ray scattering. A significantly different morphology was found to develop in these films as compared to that in films possessing as in‐plane molecular orientation. It was found tha…
Article Metallographic Differences Between Compacted Graphite Cast Iron and Vermicular Graphite Cast Iron / Unterschiede in der Gefügeausbildung von Gußeisen mit Kompaktgraphit und Gußeisen mit Graupelgraphit was published on June 1, 1984 in the journal Practical Metallography (volume 21, issue 6).
Abstract Optimal temperature profiles for nylon 6 polymerization in plug–flow reactors have been obtained with end‐point constraints involving the degree of polymerization and the cyclic dimer concentration, using the most recent kinetic information. Computations suggest that the temperature at the feed end of the rea…
Abstract The ability to predict the occurrence of plateout in PVC processing with a simple laboratory test which can be used to evaluate complete formulations before manufacture would be of significant benefit. Such a test is described and illustrated. A proposed mechanism for the induction of plateout based on attrac…
Analyses of self-excited, resonating jets have been corroborated by laboratory experiments. These structured jets achieved cavitation at greater ambient pressures and showed enhanced erosivity in comparison to the nonstructured jets from conventional drill bit nozzles.