Materials Literature
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Abstract Desilication and removal of bases from the basalitic rocks of the Hawaiian Islands produces large amounts of halloysite and gibbsite, together with variable quantities of allophane and nontronite, iron and titanium oxides, and amorphous mineral and gel material. The nature and relative abundance of intermedia…
Magnesium and aluminum single crystals subjected to varying amounts of oscillatory strain of audio frequency have been investigated by measuring the strain amplitude-dependent complex dynamical-mechanical modulus at audio frequencies as a function of temperature and time. If the amplitude of the applied excitation exc…
Received 21 December 1959DOI:https://doi.org/10.1103/PhysRevLett.4.128©1960 American Physical Society
X‐ray, optical, and chemical data are presented for sillimanites and for a wide range of natural and synthetic mullites. Single‐crystal X‐ray studies have revealed a new type of mullite (called S mullite) characterized by subsidiary sharp reflections in distinction to the extra diffuse reflections of common mullite (c…
Abstract A study was made of the mechanical and equilibrium swelling properties of five series of polyurethane elastomers prepared from polyoxypropylene glycol 2025, dipropylene glycol, trimethylol propane, and either toluene diisocyanate (TDI) or hexamethylene diisocyanate (HDI). The study included the dependence of…
Technical Briefs Radiation Fin Effectiveness J. G. Bartas, J. G. Bartas General Electric Company, West Lynn, Mass. Search for other works by this author on: This Site PubMed Google Scholar W. H. Sellers W. H. Sellers Calculations and Special Problems Unit, General Electric Company, West Lynn, Mass. Search for other wo…
A number of single crystal tungstates have been prepared for paramagnetic resonance and emission studies. Compositions such as monoclinic MgWO4, ZnWO4, CdWO4, and tetragonal CaWO4, SrWO4, and BaWO4 containing paramagnetic ions of the transition and rare earth series have been prepared. They were grown by dissolving th…
Abstract A study of polyethylenes and ethylene–vinyl acetate copolymers by dynamic mechanical mesurements gives new information on the transitions in polyethylene polymers. The melting points agree with the predictions of Flory's theory. The alpha transition is shown to be due to the melting of crystallites containing…
A method of embedding biological specimens in araldite 502 (Ciba) has been developed for materials available in the United States. Araldite-embedded tissues are suitable for electron microscopy, but the cutting qualities of the resin necessitates more than routine attention during microtomy. The rather high viscosity…
This investigation has sought to determine the significance of the wide range of extractable collagen fractions which appear to exist in growing connective tissues and to determine their position in the process of fibrogenesis. Carrageenin granulomata were induced in guinea pigs and, after injection of (14)C-glycine,…
Abstract There is need of an economical and safe method of disposing of radioactive waste produced by nuclear reactors. A method for the incorporation of fission products into glass is being studied at Chalk River. Class containing up to 50 curies of fission products per kilogram has been made during the investigation…
Abstract The changes occurring in fully hydrated halloysite during dehydration have been studied by X-ray diffraction at relative humidities that ranged from 0 to 100 percent. From the results of this study it has been concluded that: (1) layers dehydrate randomly, but instantaneously; (2) the diffraction from an indi…
It is well known that, during the displacement of a fluid contained in a porous medium by another less viscous one, the displacement front may become unstable: Fingers occur which proceed rapidly through the system.The Muskat–Aronofsky model of displacement in porous media, in which it is assumed that a sharp front ex…
Abstract The smectic clays from Cabo de Gata region, Almeria, Spain, are composed mainly of montmorillonite, but they contain appreciable quantities of fibrous clay minerals, some of which are of the palygorskite type. However, there also is a mineral that has properties intermediate between those of palygorskite and…
Abstract Proteins interact with montmorillonite forming mono- and poly-layer complexes. About 20 percent of the protein in a monolayer complex undergoes microbial decomposition and the X-ray pattern remains unchanged, whereas in polylayer complexes the protein undergoes extensive decomposition and the c-spacings of th…
The relation of the x-ray diagram at small angles to the preparation conditions of glass fibers from molten silicates is studied. The composition Na2O·MgO·3SiO2 is studied extensively, and fibers are also studied in which K2O replaces Na2O, and CuO and PbO replace MgO. Most of the diagrams are characterized by very in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 188. Aluminum Boride. AlB12J. A. Kohn and D. W. EckartCite this: Anal. Chem. 1960, 32, 2, 296–298Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://pubs.acs.org/doi/10.1021/ac…
Each time a vehicle passes over a pavement the surface is deflected and rebounds, creating temporary strain conditions for 0.01 to 0.1 sec. Information about these strain conditions can be obtained by observing the movements of the pavement under similar dynamic loading conditions. Methods used for the dynamic investi…
The system UC‐UC 2 was investigated at temperatures to 2200°C. utilizing high‐temperature X‐ray diffraction techniques. UC 2 , which has the CaC 2 structure, was shown to transform to the CaF 2 structure at 1820°C. Mean coefficients of expansion of UC, U 2 C 3 , and UC 2 were determined. The decomposition of U 2 C 3 t…
The new variable-groove-depth grating-type interferometer that was used to obtain experimental interferograms and spectra used for short and long wavelengths (λ<15 μ to λ>4 mm), together with its construction and testing, is described.