Materials Literature
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Abstract As a part of a broad programme of investigation of sodium hydroxide, the transitions up to its melting point were studied. This was accomplished by correlation of results obtained through use of differential thermal, high‐temperature microscopic, and high‐temperature X ‐ray analyses. The melting of sodium hyd…
Abstract Heating rubber‐carbon black mixtures at elevated temperatures results in vulcanizates with lower electrical conductivity, lower hysteresis, lower Durometer hardness, and increased abrasion resistance. These changes are apparently the result of chemical reactions between carbon black and rubber which alter the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Composition of Some Tetra-t-butyl Titanate-Glycol Reaction Products2Richard E. Reeves and Laurence W. Mazzeno Jr.Cite this: J. Am. Chem. Soc. 1954, 76, 9, 2533–2536Publication Date (Print):May 1, 1954Publication History Published online1 May 2002Published inissue 1 May 1…
Strength and elongation measurements were made on single cotton fibers and on yarns which had been subjected to various temperatures from 110° to 162°C and various moisture conditions from 3% R.H. up to saturation for periods of heating from 2 to 128 hrs. Moisture contents and degrees of polymerization were also deter…
Fast oscilloscopic time analysis of the negative point Trichel pulse corona in room air at various pressures and gap geometries reveals the following data. The very short rise and quenching time of the pulse at atmospheric pressure observed by English is confirmed. Under these conditions the secondary action is a phot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Filiform CorrosionW. H. Slabaugh and Morris GrotheerCite this: Ind. Eng. Chem. 1954, 46, 5, 1014–1016Publication Date (Print):May 1, 1954Publication History Published online1 May 2002Published inissue 1 May 1954https://pubs.acs.org/doi/10.1021/ie50533a053https:/…
The effect of corona on the long-time dielectric strength of insulation is emphasized in this paper, and various factors influencing the breakdown of insulation with corona are discussed. Data on the corona threshold voltages on dielectric surfaces at electrode edges show that the threshold voltage varies for a wide v…
A study of gypsum was made using the differential thermal analysis technique. Gypsum and mixtures of gypsum with silica, alumina, iron oxide, dialyzed kaolin, or carbon were analyzed. Furnace atmospheres of air, nitrogen, carbon dioxide, and carbon monoxide were used. Gases evolved at the decomposition temperature of…
The acoustic noise spectrum associated with the collapse of transient cavities produced by a stirring rod in water was measured in the frequency range 1–3500 kc. While the spectrum, in general, goes as f−2 above 1 kc, flat regions are found between 20 kc and 100 kc, and again above 500 kc to at least 3500 kc. If the f…
A method for measuring the Hall mobility in insulating photoconductors is described which avoids the space-charge difficulties present in previous measurements. Unconventional electrodes are used, and the method differs from the conventional one in several other ways. It is a transient method, and the electric field i…
A constriction (defined as a point at which the two partial dislocations are recombined) must be formed before an extended dislocation can climb. The energy required is found to be about 6 eV, but may be reduced in the presence of an applied stress. Constrictions are more easily formed in Cottrell-Lomer locked disloca…
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Microwaves propagated between two doubly-curved parallel conducting surfaces, in the geometrical optics approximation, follow rays obeying Fermat's principle. The optical distance in this case is determined both by the index of refraction of the material between the surfaces and by the curvature of the surfaces. The f…
A description is given of a comparison method for determining the values of the absorption coefficient k of a metal relative to previously determined values for Ag. In this method transmission interference filters are constructed which have mica as the dielectric and have reflecting layers of Ag and of the metal x bei…
A study was made of the factors controlling the distribution of magnesium in the calcareous skeletons of marine organisms. The mineralogy of the carbonate appears to be the most important influence, with large amounts of magnesium occurring in solid solution in the calcitic forms and generally lesser amounts in the ar…
In this investigation, the relation of susceptibility to the $a$ dimension of crystallites was studied over the range from turbostratic carbons with diameters of 50 angstroms, to graphitic crystals with diameters of at least several thousand angstroms. Two series of carbons, one Thermax carbon black in powder form, th…