Materials Literature
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Abstract A simple model is presented for the virtual crosslink effect in triblocks of the type A–B–A, where A is a segment having a relatively high T g value and B is a segment having a relatively low T g value. It is assumed that phase relationships can be estimated by using thermodynamics of polymer mixtures, but ce…
Abstract not Available.
The saturation magnetization of a 31.4 at.% Ni–Fe alloy has been measured as a function of hydrostatic pressure between 0 and 26 kbar, and as a function of shock-wave compression between 2.5 and 112 kbar. From the hydrostatic pressure measurements, a zero-pressure value of the pressure derivative of the saturation mag…
The permeation of deuterium through thin Pyrex bulbs was measured with a mass spectrometer. The activation energies and absolute values at 200°C for permeation and diffusion were nearly the same as for deuterium in fused silica. The solubility of deuterium in Pyrex was independent of temperature, and about the same as…
Abstract Isothermal and nonisothermal spherulitic crystallization in even–odd and poly(ω‐aminocarboxylic acids) has been studied for a range of fusion conditions and solidification temperatures. The variety of spherulites so formed are classified mainly by optical microscopy. It is found that polyamides with similar t…
The field of fluid mechanics is rapidly advancing, driven by unprecedented volumes of data from experiments, field measurements, and large-scale simulations at multiple spatiotemporal scales. Machine learning (ML) offers a wealth of techniques to extract ...Read More
The oxidation of 304L stainless steel has been measured in steam and in air in the temperature range from 1000 to 1375 C (1832 to 2507 F) using a thermogravimetric technique. This temperature range is of interest in the analysis of a reactor loss-of-coolant accident. Experiments in steam showed initial linear weight g…
1) In order to study the relationship between α-KGA productivity and taxonomical classification, 141 strains of identified yeast were cultivated in the media containing n-paraffins. The high productivity of α-KGA was found exclusively in Candida lipolytica. Since the productivity of α-KGA was seen in all the strains o…
The formation and dissolution of porous alumina films in sulfuric acid was studied by the incorporation of the radiotracer into the film during preparation. The results have shown that (a) the formation site of the porous oxide is the barrier layer‐porous layer interface, (b) the dissolution time for porous films is i…
The solid-state reaction ZnO + Fe2O3→ ZnFe2O4 has been studied by means of magnetic and thermo-gravimetric measurements and by X-ray analysis. Because of the diamagnetic nature of the Zn2+ ion, intermediate products can be identified and a mechanism proposed by Reijnen has been confirmed for this reaction. Magnetizati…
A new formulation of the single‐polynomial analysis is presented, in which the electron density profile is assumed to begin with a flat base at a height equal to the lowest measured virtual height. This formulation gives a more accurately defined profile with only a small number of points and agrees with the assumptio…
M. J. Broadhurst, R. Grigg and A. W. Johnson, J. Chem. Soc. D, 1969, 23 DOI: 10.1039/C29690000023
The early stages of the shell regeneration in Helix pomatia have been studied by electron microscopy. Within 1 hour after the removal of a piece of shell, minute crystals of CaCO 3 appear in the injured area. Electron diffraction study showed these crystals to be aragonite. Calcite crystals were also present at later…
Results are presented of parallel calorimetric and dilatometric experiments on several meltcrystallized polyethylenes, with various thermal histories, over the range –35°→ liquidus. Enthalpic and weight fraction degrees of crystallinity are in good agreement up to 60°C, where direct comparison with n-alkane data is po…
O. A. Y. Jackson, Fitting a Gamma or Log-Normal Distribution to Fibre-Diameter Measurements on Wool Tops, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 18, No. 1 (1969), pp. 70-75
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of zinc ion into a synthetic water-soluble porphyrinT. Peter Stein and Robert A. PlaneCite this: J. Am. Chem. Soc. 1969, 91, 3, 607–610Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://…
AGGREGATE TEST METHODS TO IDENTIFY FROST-SUSCEPTIBLE PARTICLES IN CONCRETE AGGREGATES ARE EVALUATED. TWO APPROACHES TO THE PROBLEM OF IDENTIFYING FROST-SUSCEPTIBLE AGGREGATE PARTICLES WERE FOLLOWED. RELATIVELY HOMOGENEOUS AGGREGATE FRACTIONS WERE TESTED IN CONCRETE UNDER SIMULATED FIELD CONDITIONS, TO (1) DEVELOP A RA…
Abstract New, bifunctional, bridgehead‐substituted triptycenes were synthesized and used to prepare a series of triptycene polymers, including polyesters, polyamides, polyurethanes, and a polyoxadiazole. Certain of these partially aliphatic polymers were thermally stable. Clear and colorless films were obtained in som…
Complexes of the general type CuLx(CF3CO2)2, where x= 2 or 4, L = pyridine, mono-and di-substituted pyridines, quinoline, or isoquinoline, have been prepared and characterised by spectroscopic methods. The complexes are six-co-ordinate with the trifluoroacetate group involved in either mono-or bi-dentate attachment to…
Abstract A study of the swelling of Acala 4‐42 cotton in aqueous alkalis and acids has been carried out. The degree of swelling of the cotton in the reagents has been indicated by measurement of the variations in width of the cotton at its widest point. The nature of the swelling process whether interfibrillar or intr…