Materials Literature
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The arrangement and proportion of collagen fibres and fibre bundles in the dermis of the pig have been investigated with light microscopical (Nomarski's interference contrast, polarization optics) and scanning electron microscopical methods. Skin samples were obtained from different body regions of wild boars, domesti…
In Norway the bedrock generally is glacially polished with no appreciable signs of weathering. Little is known about the thickness, age and composition of the weathered regolith that overlay these areas in preglacial time. Occurrences of isolated pockets and smaller areas of deeply weathered rocks appear, however, to…
Rotational averages of even rank up to 10 are expressed as linear combinations of invariants and are shown to be easy to evaluate by computer programming. Simple relations between averages of different rank are obtained. Averages of odd rank may be straightforwardly derived from averages of even rank.
Discharge and charge characteristics of various phthalocyanine cathodes coupled with lithium metal are studied. The best capacity based only on cathode active material weight is 1440 A‐hr/kg in the lithium/iron phthalocyanine system, and the cycle life of the lithium/Cu phthalocyanine system is more than 100 times at…
The modulated structure of the NC-type pyrrhotite Fe1 - xS with x = 0.09 has been determined. The analysis is based on a four-dimensional space group, Wpna21qq1, and an anharmonic modulation model with 53 positional, two thermal, and eight occupational parameters including up to fourth-order harmonics, a = 11.952, b =…
The X-ray structural determination is reported for the first compound possessing a single carbon atom bridging tow first-row transition metals with a linear Fe–C–Fe bond and an Fe–C bond length of only 1.675 Å.
La solubilité dans l'eau d'un système binaire de carbonates est régie par le produit total de solubilité, qui est la somme ∑∏ des produits partiels de solubilité des deux pôles. ∑∏, tracé en fonction du titre molaire de la phase solide et de celui dans la solution aqueuse, donne des courbes semblables aux diagrammes d…
A new model-independent method is proposed for evaluating the in vitro dissolution time and disintegration time of solid dosage forms. The mean in vitro dissolution time (in vitro MDT) is defined as the first moment of the dissolution rate-time curve, that is, MDT=∫∞0t (dm/dt) dt/∫∞0 (dm/dt) dt, where dm/dt is the dis…
Description The compilation of papers provides a good cross section of the state of the art in atmospheric corrosion. Some of the topics addressed include the behavior of engineering materials, weathering steels, metals with metallic coatings, monitoring atmospheric exposure sites, and laboratory tests and their corre…
The threshold voltage at which visible defects could be produced in MgO by electron irradiation in a HVEM has been determined over a wide range of temperature for the ⟨001⟩, ⟨011⟩ and ⟨111⟩ directions. In a separate experiment, the growth of oxygen vacancy centres produced by electron irradiation along ⟨001⟩ at 90 K w…
Abstract
The water and salt transport properties of untreated and heat-treated poly(vinyl alcohol) (PVA) membranes were investigated. Water and salt permeabilities decreased abruptly as a result of heat treatment. The effect of heat treatment on the water and salt transport in PVA is expressed mainly by changes in the activati…
A simple model incorporating thermal elastic anisotropy stresses is used to calculate the microcrack zone size around cracks in Al 2 O 3 . It is found that the ratio of microcrack zone size to grain size is almost constant for notched beam tests, but increases with grain size for double cantilever beam data. It is sug…
A detailed comparison between accurate infrared reflectivity data and dielectric constant ε0(T) measurements has been carried out in ABO3 ferroelectrics. In BaTiO3, the ferroelectric mode saturates above the cubic-tetragonal transition, whereas ε0( T) tends to diverge. This supports an intrinsic crossover from displac…
Single crystals of high-purity (RRR\simeq4000) niobium were tested in tension in the temperature range of 2 K–350 K to study the low temperature plasticity. Activation analyses of the results showed that an Arrhenius type strain-rate equation appeared to hold above 50 K but not below this temperature. Increase of the…
Abstract The structural relations of solid solutions in the series (Sr 1−x Ba x )Al 2 O 4 were studied using room- and high-temperature X-ray methods, infra-red spectroscopy, and DTA. At room temperature, SrAl 2 O 4 and solid solutions with x up to 0.31 are monoclinic, between x = 0.31 and 0.43 monoclinic and hexagona…
From microscopical observations and structural studies on the mesophases of a new thermotropic polar compound — the nitrobenzoyloxybenzoate of octylphenyl — we have shown the existence of a novel fluid mesophase built with ribbons forming a two-dimensional oblique lattice. We propose a crude model based upon structure…
The photosensitivity of heteropoly-compounds in the presence of organic compounds, which results in reduction of the former and oxidation of the latter, coupled with the ease of reoxidation, by oxygen, of some of the heteropoly-compounds, provides the basis for photocatalytic oxidation of organic compounds.
A convenient General synthesis, applicable to alkanes and terminally mono- and di-substituted alkanes of any chain length, is described; cyclododecanone is used as the starting material, and the C12 chain is doubled in length as often as required and adjusted first to a multiple of 12, and than to any desired length.
A 3-stage GaAsFET amplifier operating at 13 K, utilizing source inductance feedback is described. The amplifier has a noise temperature of15 dB over the 1.2- to 1.7-GHz frequency range.