Materials Literature
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Poly(amide-urethanes) with long repeating units were prepared from 2-aminoethanol, α,ω-alkylene dicarboxylic acid chlorides, and 1.6-diisocyanatohexane. These partially crystalline polymers undergo slow hydrolysis when suspended in buffered water but were found to be more readily degraded by the enzyme subtilisin.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of terminal metal hydrides: solution and matrix-isolation studies of [(.eta.-C5H5)2MHn]x+ (M = Re, Mo, W, Nb, Ta; n = 1-3; x = 0, 1)Reuben B. Girling, Peter Grebenik, and Robin N. PerutzCite this: Inorg. Chem. 1986, 25, 1, 31–36Publication Date (Print):Ja…
Article Some Physico-Chemical Properties of Bismuth Chalcogenides x-Ray Photoelectron and Diffuse Reflectance Spectra was published on January 1, 1986 in the journal Zeitschrift für Physikalische Chemie (volume 267O, issue 1).
General effects of five types of ageing on textiles are examined. The types of ageing discussed are physical, photochemical, thermal, chemical and mechanical. Changes in the structure and properties of textiles that result from each type of ageing are discussed in general terms. This paper is expected to provide conse…
The dielectric conditions which are unique to converter transformers and smoothing reactors are examined. Both steady state and transient situations are discussed. Two additional tests are recommended for this equipment - a long term dc applied potential test and a polarity reversal test. Formulae are developed to cal…
Abstract The luminescence processes in several rare‐earth compounds are discussed, viz. sensitization, one‐step energy transfer, multi‐step energy transfer (migration) and trapping. Results are given for compounds containing Eu 3 + , Tb 3+ and Gd 3+ . The dimensionality of the rare‐earth sublattice (three, two or one)…
The effects of the laminated paper layer direction on the conductivity and the dc breakdown strength in oil-impregnated paper were experimentally clarified. It was confirmed that not only oil and paper discharges through the laminated paper layers, but also paper discharges along them triggered total flashover in oil…
The ignition of metals and alloys by impacting high-velocity particles in gaseous oxygen was investigated. A convergent/divergent nozzle was used to accelerate the flowing oxygen, which in-turn accelerated the particles to velocities greater than 305 m/s (1000 ft/s). The test sample (target) was placed at the end of t…
Zinc oxochlorins (porphyrinones) react with osmium tetroxide to give exclusively adjacent-ring saturated isobacteriochlorins without any bacteriochlorins that would normally arise from such a reaction with free base porphyrinones; the diols can be converted into the baem d1-like porphyrindiones.
Abstract The current values reported for the Gibbs free energy of formation for magnesite [MgCO 3 (s)] are bimodally grouped, centered at −1012 kJ mol −1 and in the range −1026 to −1030 kJ mol −1 . The solubilities of three natural magnesites in aqueous solution were determined in order to verify the appropriate value…
Composition-based correlations to predict the relative sensitization resistance of AISI 304 and 316 stainless steel (SS) have been evaluated by comparison to a large data base. The best fit to experimental data was achieved using a slightly modified version of Cihal’s elemental parameters: Cr⋆=Cr+1.6Mo−0.2Ni−100Cwhere…
Binding energies of carbonaceous overlayers on ruthenium were measured using angle-resolved XPS data and curve fitting procedures. A carbonaceous overlayer prepared by dehydrogenation of adsorbed ethylene at 750 K was disordered and had a binding energy of 285.0 eV. After annealing to 1300 K islands of azimuthally ord…
The degradation of fracture resistance of ferritic steels subjected to neutron irradiation can be qualitatively evaluated by examining the shift in the ductile-to-brittle transition temperature and the drop in the upper-shelf energy as determined in the Charpy impact test. That is an empirical test, however, and its u…
The secondary alcohol oxidase from Pseudomonas sp. catalyzed the oxidation of various vinyl alcohol oligomers with the molecular weight of 220 to 1500 and of β-ketols such as 5-hydroxy-3-heptanone, 4-hydroxy-2-nonanone, 3-hydroxy-5-nonanone, 6-hydroxy-4-nonanone, 7-hydroxy-5-dodecanone, and 8-hydroxy-6-tridecanone. β-…
Martine Chevillard, Pierre Couble, Jean-Claude Prudhomme; Complete nucleotide sequence of the gene encoding the Bombyx mori silk protein P25 and predicted
The complexes [FeIIL(CN)2]·xH2O of the macrocyclic Schiff-base ligands L1–L3 derived from the condensation of 2,6-diacetylpyridine with 3,6-diazaoctane- 1,8-diamine (L1), 3,7-diazanonane1,9-diamine (L2), and 3,6-dioxaoctane-1,8-diamine (L3) have been prepared and their magnetic susceptibilities and Mössbauer spectra s…
Experimental evidence for the formation of Ti 3 B 4 with an orthorhombic Ta 3 B 4 ‐type structure is presented. This phase forms by a peritectic reaction between TiB 2 and liquid at ∼2200°C and is stable to temperatures at least as low as 1690°C, the lowest temperature at which samples were annealed. No evidence was f…
Abstract
In an invariant formulation of pth-grade continuum mechanics, forces are defined as elements of the cotangent bundle of the Banach manifold of Cp embeddings of the body in space. It is shown that forces can be represented by measures which generalize the stresses of continuum mechanics. The mathematical representation…
Etude de la densite, de la stabilite dimensionnelle et des proprietes de sorption de composites obtenus par impregnation de bois de Pinus radiata, Picea abies, Fagus sylvatica et Populus marilandica par des resines epoxydes