Materials Literature
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The energies of interaction of the molecules CH4, C2H6, C3H8, n-C4H10, n-C5H12 and n-C6H14 with the surface of graphite lattice have been calculated employing a Monte Carlo method. The present calculations are based on the assumption that the interaction energy is expressible as a sum of the pair interactions between…
The rapture appearances and pressures are compared for clamped disks, biaxially stressed to rupture under upward increasing pressures of helium or of an embrittling fluid such as gaseous hydrogen isotopes. Usually the downward surface is available for observation during the test in progress, but it can be exposed to a…
The Sediment of Lake Kummerow. Investigations on the Chemism and the Diatom Flora The paper deals with the distribution of chemical parameters and of diatoms in the deposits of the eutrophic Lake Kummerow (GDR), produced during about the last 3500 years. The sediment consists of a calcareous gyttja with a very low con…
The structure factor of supercooled liquid gallium and mercury has been measured as a function of temperature with $\mathrm{Cu}\ensuremath{-}K\ensuremath{\alpha}$ x radiation. The use of samples consisting of a planar array of a large number of small droplets of about 10-\ensuremath{\mu}m diameter allowed supercooling…
Abstract not Available.
The electronic and ionic conductivities of were determined as a function of temperature, oxygen partial pressure, and trivalent dopant content. The experimental observations were in reasonable agreement with the proposed defect structure model. Ionic conductivity for undoped zirconia was attributed to doubly ionized o…
The electronic spectra of copper(II) and nickel(II) corrole anions are described and compared with the corresponding metal porphyrin spectra. The spectra are interpreted with the aid of self-consistent field Pariser–Parr–Pople π-electron calculations, and comparison with similar calculations for the porphin ring allow…
The stability of melt spinning was analyzed by solving numerically for transients the fundamental equations of melt spinning developed by the author previously. Results were summarized in the form of stability maps in the (t*-St) plane using the cooling air speed as third parameter. Here t* is the air temperature and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron carbonyl complexes of thioureas and thioamidesHoward. Alper and Albert S. K. ChanCite this: Inorg. Chem. 1974, 13, 1, 225–232Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Published inissue 1 January 1974https://pubs.acs.org/doi/10…
An electrochemical cell technique was used to measure the ionic transference number of sintered specimens of nonstoichiometric as a function of temperature (590°–1000°C) and oxygen partial pressure (1–10 −22 atm). The results were described in terms of a high and low oxygen pressure region. The ionic transference numb…
The problem of determining the optimal operating conditions for both continuous and batch crystallizers is discussed, and good physical reasons for the existence of unconstrained optimal policies given. Computational methods for determining these optimal policies are outlined and illustrated by analogy with earlier wo…
Some reactions have been studied at 80 °C between aqueous alkaline media and metakaolinite with and without added silica. The bases employed were TlOH, Ba(OH)2+ TlOH, Ba(OH)2+ LiOH, and Ba(OH)2+ NaOH. A similar study was made of kaolinite with aqueous Ba(OH)2+ LiOH. Kaolinite was less reactive than metakaolinite and y…
Phenomenological and molecular considerations indicate certain limitations to the elastic moduli and flexoelectric coefficients of liquid crystals.
Single-crystal Raman spectra are reported for the three title compounds, and i.r.-reflectance parameters for apatite. An essentially complete assignment is deduced for apatite, including lattice modes, and is in close agreement with the predictions of factor-group analysis. The main features of the Raman spectra of va…
La simulation du comportement dcs défauts ponctuels dans un réseau par la méthode de Monte-Carlo a pu étre rendue trés rapide gréce à I'utilistion de lois de probabilité en fonction du temps pour chaque évènement possible (création, disparition ou transformation d'un défaut), évitant ainsi le traitement de chaque saut…
Ninety-five strains of Bacteroides hypermegas Harrison and Hansen and of related organisms were isolated from the feces of humans, pigs, dogs, and chickens and were compared with three authentic strains of B. hypermegas. All isolates shared certain features in common: They were gram-negative, nonspore-forming, nonmoti…
Description Nineteen papers cover internal hydrogen embrittlement, testing for relative susceptibility, testing for hydrogen pickup during processing, mechanical delay-time test, hydrogen defection methods, hydrogen environment embrittlement
The characteristics, advantages, and limitations of various methods for the detection of susceptibility to intergranular corrosion in austenitic stainless steels due to carbide precipitation are discussed. Information on corrosion rates and acceptance limits in nitric acid and ferric sulfate-sulfuric acid tests is pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of silver(III) octaethylporphyrinDale Karweik, Nicholas Winograd, D. G. Davis, and K. M. KadishCite this: J. Am. Chem. Soc. 1974, 96, 2, 591–592Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Pub…
A hexa-aza-macrocyclic compound of high thermal stability is readily obtained from 2,9-diamino-1,10-phenanthroline by its thermolysis or by its condensation with 2,9-dihalogeno-1,10-phenanthroline. The structure of this macrocycle has been established as a conjugated system of a novel type, related to some extent to p…