Materials Literature
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Examples are given of the varying morphological habits of kaolinite and illite in sedimentary deposits and soils. Some of the plates may even have a thickness of too few unit cells to permit detection by X-ray analysis. Different nomenclatures and modes of identification have created difficulties in the classification…
Abstract C lay fractions from four soils were analyzed for kaolinite and gibbsite by differential thermal analysis (DTA) and selective dissolution analysis (SDA). The kaolinite values by the two methods had a standard deviation of ±0.95 for the 2–0.2 μ clay of the three most highly weathered soils. Apparently some kao…
Abstract Die A‐Form der Sesquioxide der Seltenen Erden wird zur Überprüfung der an La 2 O 3 gefundenen gesetzmäßigen Auslöschungen, Symmetrie und der Feinbereich‐Verzwillingung gemäß eines statistischen Modells erneut an Nd 2 O 3 ‐Einkristallen (Hochtemperatur A‐Form) untersucht. Auch hier liegen die an La 2 O 3 gefun…
This paper presents a three-dimensional mathematical model which describes a plain knitted fahric subjected to biaxial stresses. A relationship is established between ap plied stresses and fabric deformation through geometric parameters of the fabric structure. Consideration is also given to jamming of the yarns, whic…
Abstract The fatigue failure of natural rubber vulcanizates undergoing repeated low tensile deformations has been investigated. It is found that below a critical deformation the life is greatly influenced by the ozone concentration in the test atmosphere. This result was anticipated theoretically from previous studies…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton Magnetic Resonance Spectra of TetracyclinesM. Schach von Wittenau and Robert K. BlackwoodCite this: J. Org. Chem. 1966, 31, 2, 613–615Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue 1 February 1966https://pubs.a…
The present paper develops a nonlinear theory for the deformation of an elastic surface by assuming the existence of a strain energy function and postulating a principle of virtual work which governs its mechanical behavior. By considering the strain energy function to depend on the first- and second-order deformation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Zr2(OH)2(SO4)3(H2O)4D. B. McWhan and Georg LundgrenCite this: Inorg. Chem. 1966, 5, 2, 284–289Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue 1 February 1966https://pubs.acs.org/doi/10.1021/ic5…
The fluorescence behavior of Gd3+ and Tb3+ has been studied with the ions dissolved together in a Calibo-1 glass host. The two ions form a coupled system so that energy absorbed by Gd3+ is transferred to Tb3+ by a nonradiative mechanism and is then emitted as Tb3+ fluorescence. When Tb3+ is incorporated alone into thi…
Abstract Of nine glassy polymers so far investigated, eight yield evidence that fracture propagation involves the formation and breaking of craze material. All eight produce fracture surfaces exhibiting interference colors to one extent or another and even the colorless areas cause low angle x‐ray scattering. Ranked i…
The fine fractions of samples from a cyclothemic section in the Catskill facies, Appalachian region, have been analysed by X-ray diffraction and determinations of iron content made. All the samples contain both illite and chlorite, and some contain kaolinite. Two of the cyclothems are richer throughout in kaolinite. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Strontium-Strontium Hydride Phase System1D. T. Peterson and R. P. ColburnCite this: J. Phys. Chem. 1966, 70, 2, 468–471Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published inissue 1 February 1966https://pubs.acs.org/doi/10.1021…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of the Thermal Decomposition of Some Complex Oxalates of Iron(III) Using the Mössbauer EffectP. K. Gallagher and C. R. KurkjianCite this: Inorg. Chem. 1966, 5, 2, 214–219Publication Date (Print):February 1, 1966Publication History Published online1 May 2002Published…
Ensign, J. C. (University of Wisconsin, Madison), and R. S. Wolfe. Characterization of a small proteolytic enzyme which lyses bacterial cell walls. J. Bacteriol. 91:524-534. 1966.-An enzyme isolated from a myxobacter possesses both cell-wall lytic and proteolytic activity. The enzyme has been purified over 600-fold an…
Abstract T he objective of this paper is to present flow sheets for a system of quantitative minera-logical analysis of clays of soils and sediments and to show representative results. Selective dissolution analysis by the Na 2 S 2 O 7 -HCl-NaOH procedure yields the quartz and feldspar contents (0 to 63%) and differen…
A search was made for evidence of metastable phase separation in binary alkali metal oxide‐silica glasses which had been subjected to the usual glassmaking procedures of melting, relatively fast cooling, and annealing. Electron microscopy and electrical properties measurements were the principal tools of investigation…
Abstract The partial purification and resolution of the soluble lactose synthetase into two protein components, A and B, which individually do not exhibit any catalytic activity is discussed.
Abstract Liquid carboxyl‐terminated polybutadiene (CTPB) on aging in air increased in viscosity and molecular weight and eventually gelled. Simultaneously, the acid content decreased without formation of anhydride, the changes being a function of the hydrocarbon portion of the molecule. Cured stocks of CTPB underwent…
Abstract Approximations in the Avrami treatment of impingement which arise when the growing crystalline bodies are rods or disks are discussed, with particular reference to the single‐crystal model. This model, previously fitted to the isolated primary crystallization of polymethylene, is extended to discuss the growt…
Measurements have been carried out of the electrical conductivity of single crystals of calcium oxide from 300 to 1400°K, and of strontium oxide from 600 to 1050°K. It was measured at 1·59 kc/s for both oxides, and also with d.c. for calcium oxide. For calcium oxide the conductivity was 1 × 10 -8 ω -1 cm -1 at 1050°K…