Materials Literature
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IRAS (infrared reflection absorption spectroscopy) has been employed to study the isotopic mixing reaction: 13C16O(a)+12C18O(a)→13C18O(a)+12C16O(a) on Ni(111) with preadsorbed K adatoms. Under high temperature conditions (T>450 K) where the isotopically mixed CO is being desorbed, it has been shown that the iso…
Euctectoid decomposition of cubic ( c ) ZrO 2 in MgO‐partially‐stabilized ZrO 2 (Mg‐PSZ) has been studied using optical, scanning electron, and transmission electron microscopy. Alloys containing from 8.1 to 18.6 mol% MgO were decomposed by annealing between 1100° and 1300°C for times up to 16 h. The eutectoid product…
Nineteen 4-hydroxy- and 4-methoxy-2-pyrones related to elasnin (I) have been assayed for in vitro inhibition of human sputum elastase (HSE), porcine pancreatic elastase, alpha-chymotrypsin, and trypsin. Inhibition is reported as Ki and Ki'; percentage inhibition was dependent on [S] in a number of cases, making it uns…
The effect on corrosion of composition and microstructure in a series of FeCr-10%Ni alloys with increasing chromium content has been investigated in reducing acids. In the range of 25 to 35% Cr, a wide variation exists in the relative amounts of ferrite and austenite. In reducing acids (H2SO4 and HCl), preferential at…
Multilamellar liposomes were prepared from dipalmitoyl phosphatidylcholine or egg lecithin in combination with cholesterol and either dicetyl phosphate or stearylamine. The size and charge of the colloidal preparations were characterized before labelling with [111In]8-hydroxyquinoline. Freshly labelled liposomes were…
A new theory of dynamic correlations in a strongly coupled, classical one-component plasma (OCP) is developed within the generalized viscoelastic formalism. Fully convergent kinetic equations for the strongly coupled OCP are thereby derived with the aid of a fluctuation-theoretic formulation of the collision integrals…
A series of approximately 150 tests were conducted on ceramic targets struck by cylindro-conical hard-steel projectiles at normal incidence up to velocities of about 1000 m/s. The primary objective was the determination of the effect of layering and the delineation of the ballistic limit of various combinations. In ad…
The main results of the theory of seignette-magnetism are presented. The data on crystalline structure, phase transitions and the properties of more than 70 different seignette-magnetic compounds are reported. Some experimental data on the interaction between dielectric and magnetic properties of seignette-magnets are…
The nucleotide sequence of a 2.9-kilobase Bacillus subtilis DNA fragment containing the entire coding region of aspartokinase II and adjacent chromosomal regions (Bondaryk, R. P., and Paulus, H. (1985a) J. Biol. Chem. 260, 585-591) has been determined. The results confirmed the earlier prediction that the two subunits…
Abstract Untaxial tension tests to the yield point were performed on polypropylene as a function of temperature from 22 to 143°C at a strain rate of 2 min −1 . At 22, 42, and 71°C, measurements were also made at strain rates from 0.02 to 8 min −1 . Yield energy was found to be a linear function of temperature extrapol…
The insulation strength of solid dielectric spacers, sand wiched between electrodes and stressed by dc voltage, can be influenced by surface charges building up during voltage application. The measurement of these trapped charges is diffi cult during the charge accumulation process, but may be car ried out by means of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsically electrically conducting poly(metal tetrathiooxalates)John R. Reynolds, James C. W. Chien, and C. Peter LillyaCite this: Macromolecules 1987, 20, 6, 1184–1191Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 J…
Water adsorption and surface conductivity on ceramic substrates are important parameters in the electrochemical corrosion of thin-film metallizations and the associated growth of dendrites in humid environments. The adsorption of water provides the necessary electrolyte through which ion migration and electrochemical…
Reactor physics tests at initial startup and after refuelings are performed to verify the nuclear design and to assure safe operation. Analog computers and instruments are widely used for the acquisition of data, and these data are reduced by hand. These conventional procedures, however, require much time and labor. S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectron spectroscopy with variable photon energy. A study of the metal hexacarbonyls M(CO)6 where M = Cr, Mo, and WGlyn Cooper, Jennifer C. Green, Martin P. Payne, Barry R. Dobson, and Ian H. HillierCite this: J. Am. Chem. Soc. 1987, 109, 13, 3836–3843Publication Date…
The conversion of the reducible divalent cross-links in collagen to non-reducible multivalent cross-links in mature collagen has resulted in the identification of several new amino acids as the putative mature cross-link. None of these compounds has completely satisfied the necessary criteria. We have now isolated an…
The approach of free radical polymerization is adapted to develop a kinetic model for predicting the curing behavior of unsaturated polyester resins. The approach taken here is essentially similar to that advanced by Stevenson with some modifications, namely (1) the efficiency of the initiator is assumed to decrease w…
ABSTRACT Some modern laminated and calcified stromatolitic structures are partially or completely formed by eukaryotes. Diatom populations in freshwater environments with elevated ionic concentrations contribute to calcite precipitation, and the formation of distinctive mineral‐rich stromatolitic laminae. Two types of…
Abstract Dimethylselenoxide (DMSeO) forms three structurally resolvable intercalates with kaolinite (d(001) = 10.95, 11.26, and 11.38 Å). The 11.26-Å kaolinite: DMSeO intercalate is structurally analogous to the 3-D ordered kaolinite: DMSO intercalate (d(001) = 11.22 Å). Infrared and solid-state 77 Se nuclear magnetic…
Some properties of the polyesters treated with such an addition-type chain extender as 2,2′-bis(2-oxazoline) (BOZ) have been investigated. The molecular size distribution and the melting point of the resultant polyesters indicate that BOZ reacts to form linear chain-extended polymers without branching. As for their th…