Materials Literature
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The theoretical mechanical behavior of a plain knitted fabric subjected to biaxial stresses is derived. An approximate mathematical model of the fabric structure was established from which the stress vs fabric-geometry and stress vs strain relationships were determined. The work was done by considering only the proper…
A method is described employing 14 CO 2 uptake by the marine centric diatom Cyclotella nana (clone 13-1) for the bioassay of vitamin B 12 in seawater. Seawater samples were filter sterilized, supplemented with sterile medium constituents, and diluted with a similarly supplemented, charcoal-treated filtered seawater. S…
Abstract Foam separation of microorganisms has been investigated with varying success by many workers, usually at high rates of gas flow. Microflotation was developed to overcome some of the disadvantages inherent in these high gas‐flow‐rate processes and is introduced in this paper as a new technique for the foam sep…
Abstract T he basic outlines of most of the hydrous layer silicate structures were determined during the 1930’s. Present escalating interest in obtaining additional detail is indicated by (a) publication of over twenty structural refinements (2-D or 3-D) during 1954-64, (b) publication of at least nine structures in 1…
It was discovered by the authors that Ti is easily attacked by stress corrosion cracking in methanol containing HCl. This is a report on a study to assess quantitatively stress corrosion cracking of Ti in alcohol solutions. At the same time stress corrosion cracking of Zr was studied because of its similarity in chemi…
Numerous rare-earth element analogues have been found for well-established rare-earth minerals. In order to prevent a multitude of impractical names, a system of nomenclature is proposed. A group name, e.g., monazite, is suggested for rare-earth minerals for which the rare-earth element distribution has not been deter…
Mössbauer spectra of FeCr 2 O 4 and FeV 2 O 4 , which undergo the cubic-to-tetragonal transition at 135°K and 140°K respectively, have been measured in the temperature range from liquid nitrogen to room temperature. Quadropole splittings have been observed even above the distortion temperature. Each line of the Mössba…
Experiments are reported which show that the temperature distribution in molten gallium contained in a horizontal boat on which is impressed an axial temperature gradient becomes oscillatory when the temperature gradient exceeds a critical value. It is proposed that the oscillations are an example of the phenomenon of…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reaction between Bovine Brain Tissue Factor and Factors VII and X*Yale NemersonCite this: Biochemistry 1966, 5, 2, 601–608Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue 1 February 1966https://pubs.acs.org/doi/10.1…
The temperature and stress dependence of the secondary creep rate of fine-grained polycrystalline magnesium have been investigated in the strainrate range 3·3 × 10−1 to 3·3 × 10−3 sec−1. Stress relaxation studies were combined with the creep experiments to obtain accurate values for the activation volume. They also ga…
A series of two-dimensional classical kinematic computer calculations have been made on the hypothetical exothermic exchange reaction A+BC→AB+C, −ΔH=48.5 kcal mole−1. Product energy distribution (vibration, rotation, and translation; Evib, Erot, Etrans) was obtained as a function of initial position, impact parameter,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Magnetic Susceptibilities of the Cobalt-Sulfur SystemRobert F. Heidelberg, Alan H. Luxem, Sami Talhouk, and John J. BanewiczCite this: Inorg. Chem. 1966, 5, 2, 194–197Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue…
Abstract Changes in the molecular weight distribution of natural rubber, after mill mastication, have been studied by using a Water's gel permeation chromatography. This study indicates that as the polymer is milled the distribution is narrowed primarily through the breaking down of large molecular weight molecules. T…
The diffusion of hydrogen in copper-palladium alloys has been studied by utilizing the dependence of electrical resistivity upon hydrogen concentration—a technique both rapid and simple. At 25°C the diffusion coefficient in the range 0–58 at.% Cu is relatively insensitive to alloy composition but is extremely sensitiv…
Abstract Stress softening (Mullins effect) occurs in rubber vulcanizates during the first and subsequent deformations. This paper shows the similarity of the degree of stress softening in both unfilled and carbon black‐filled vulcanizates of natural rubber when stressed almost to break. This confirms the earlier inves…
The vertical migration of two Euglena species and several diatom species into and out of the sediment on the banks of the River Avon has been studied under natural conditions. All species have been shown to migrate vertically upwards when exposed during daylight. Tidal flooding of the sediment is generally preceded by…
Voltage-current curves of such organic insulators as polyethylene-terephthalate and polyvinylformal display the familiar Richardson-Schottky characteristics for fields between 20 and 200 kV/cm and temperatures from 25° to 100°C. Assuming the Schottky emission mechanism being the limiting factor in establishing the ste…
A fracture theory is proposed for a composite system based on a continuous glass matrix. It is hypothesized that hard crystalline dispersions within the glass matrix will limit the size of Griffith flaws and strengthen the composite. Quantitative relations are derived for the effect of a dispersed phase on composite s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of Gaseous Mixtures Using Porous Polyaromatic Polymer Beads.O. L. HollisCite this: Anal. Chem. 1966, 38, 2, 309–316Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue 1 February 1966https://pubs.acs.org/doi/10.1…