Materials Literature
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The reasons for the acceleration of floating fibres, mentioned in a previous paper, are discussed here in greater detail. The paper indicates the importance of considering each fibre individually and shows that, when this is done, the predicted and observed fibre movements agree. The paper then goes on to discuss the…
The general arrangement of atoms in berthierite had been suggested in an earlier publication by solving the Patterson function P(xy), with the aid of the minimum function M8(xy). In this paper a report is given of the refinement of the structure. The intensities were measured by the M.I.T. modification of the Dawton m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Half Life of Carrier-Free Yttrium-90M. L. Salutsky and H. W. KirbyCite this: Anal. Chem. 1955, 27, 4, 567–569Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ac6…
Optical and x-ray studies of synthetic and natural material of magnesium cordierite composition lead to the conclusion that there are five polymorphic modifications. It is proposed to restrict the name cordierite to the two pseudohexagonal forms (connected by high-low inversion relation) and to designate the two hexag…
Abstract The validity of the Flory‐Schulz distribution of chain length in equilibrium polymers produced from ϵ‐caprolactam and water (Nylon 6) over a DP range from ∼14 to ∼90 is tested by determination of the content of monomer (ϵ‐aminocaproic acid, ACA) by means of a chromatographic technique. Experiments show genera…
The general configuration of the emission spectrum of synthetic NaCl crystals which had been irradiated with 7 × 105r of x-rays at room temperature and were then permitted to luminesce at 500°K was determined, and bands were located with maxima at 362, 418, 432, and 525 millimicrons. The glow curves for NaCl crystals…
ABSTRACT Available records indicate that the formation of glauconite requires marine water near normal salinity, reducing conditions, and appropriate source materials. It is favored by high organic content of the bottom sediments in which it forms, and by slow or negative sedimentation. It may form under a fairly wide…
Experimental measurements of the kinetics of thermal decomposition of ammonium nitrate have been made in the temperature range from 443 to 553°K. The results indicate that the degradation of ammonium nitrate is an autocatalytic liquid-phase reaction, the rate of which is proportional to the product of the mass of salt…
The splitting of the methylene deformation frequencies in crystals of n-paraffins is described in terms of interaction between nearest-neighbor molecules On the basis of a simplified model, the order of magnitude of the splitting may be accounted for Polarization behavior and changes occurring upon heating, cooling, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Equilibria in the System K2CO3-Nb2O5 by the Method of Differential Thermal AnalysisArnold Reisman and Frederic HoltzbergCite this: J. Am. Chem. Soc. 1955, 77, 8, 2115–2119Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Resolution and Racemization of Potassium Ethylenediaminetetra-acetatocobaltate(III)F. P. Dwyer, E. C. Gyarfas, and D. P. MellorCite this: J. Phys. Chem. 1955, 59, 4, 296–297Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability of Iron(III)-Phenol Complexes1Ronald M. MilburnCite this: J. Am. Chem. Soc. 1955, 77, 8, 2064–2067Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ja01613a009https…
In a nuclear reactor, quartz alters gradually to an amorphous form. Some of the property changes observed are ( a ) decreases in density, refractive indices, rotatory power, and birefringence, ( b ) disappearance of the α‐β transition, and ( c ) changes in the absorption spectrum. The properties of vitreous silica als…
Abstract A previous analysis of the polymerization of liquid sulfur has been revised to take account of specific heat data now available and some new experimental evidence presented here. It is confirmed that liquid sulfur is essentially an equilibrium mixture of S 8 rings and long free radical chains. The heat of pol…
Abstract The viscosity slope constant k ′, i.e. , \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\lim }\limits_{c \to 0} \frac{{d\left( {{{\eta _{sp} } \mathord{\left/ {\vphantom {{\eta _{sp} } c}} \right. \kern-\nulldelimiterspace} c}} \right)}}{{dc}}\frac{1}{{[\eta ]^2 }} $\end{document} , is sho…
The absorption of high‐frequency (60 kc. to 20 me. per second) sound waves in fused silica shows a large peak at low temperatures (30° to 50°K.). This absorption appears to result from some property of the glassy state since the absorption does not occur in crystalline silica. Data are presented showing the variation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCellulose and Cellulose Derivatives.Ward PigmanCite this: J. Am. Chem. Soc. 1955, 77, 8, 2349Publication Date (Print):April 1, 1955Publication History Published online1 May 2002Published inissue 1 April 1955https://pubs.acs.org/doi/10.1021/ja01613a114https://doi.org/10.1021/…
Las experiencias realizadas en Anchor Concrete Products, Inc., Buffalo, N.Y., y otras instalaciones construidas recientemente, ponen de manifiesto las ventajas de los autoclaves cilíndricos de gran diámetro.
Una nueva fábrica de piezas prefabricadas de hormigón dedica sus actividades a la preparación de tejas de hormigón, en el futuro alcanzará una producción diaria de 36.000. En este artículo se den las características de la instalación, proceso de fabricación y piezas fabricadas. Las ventajas son considerables.
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