Materials Literature
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Abstract Sections for electron and light microscopy were easily prepared from mixtures of Dow Epoxy Resins 332 and 732 (D.E.R. 332 and D.E.R. 732) cured with dodecenyl succinic anhydride (DDSA) and DMP‐30. The most useful formula contained 46.7% D.E.R. 332, 20% D.E.R. 732, and 33.3% DDSA, plus 2% DMP‐30. Stronger sect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFabrication of Targets for Neutron Irradiation of Neptunium DioxideR. E. Myrick and R. L. FolgerCite this: Ind. Eng. Chem. Process Des. Dev. 1964, 3, 4, 309–313Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Published inissue 1 October 1…
Heats of solution in 3.83N HF have been measured for zirconium metal and for five zirconium hydrides to evaluate the following heats of formation AHf0298: ZrH2 -39.7, ZrH1.85 -38.2, ZrH1.70. -34.7, ZrH1.43 -30.05, ZrH1.23 -25.3 kcal/mole hydride. A review of heat capacity and entropy data for zirconium hydrides has en…
An electron microscope examination of neutron damage in graphite single crystals irradiated at 900°C and 1200°C reveals two types of defect, which have been identified by detailed studies of their diffraction contrast. Large interstitial loops of radius about 350 Å are surrounded by small vacancy loops which appear to…
Studies of the fracture behaviors of strain-rule sensitive materials suggest sharply notched impact-type toughness evaluations are fast enough for adiabatic conditions at the crack border and are largely controlled by a minimum level of the crack toughness. With the possible exception of very high strength steels, whe…
An improved counterbalanced sphere viscometer‐densitometer was used to obtain information at temperatures between 1000° and 1400°C for (a) molten B 2 O 3 , (b) a series of borosilicate melts containing up to 55 mole % SiO 2 , and (c) a series of borogermanate melts containing up to 65 mole % GeO 2 . The dependence on…
Infrared spectra of thin solid films formed by the condensation of gaseous mixtures of NH3 or ND3 and CO2 at low temperatures were obtained in the region from 4000 to 400 cm—1 at —25°, —78°, and —190°C. Two types of spectra were obtained, depending upon the temperature of formation of the solid. Type I, formed at —78°…
The mechanical and physical properties of pyrolytic graphite are closely related to the structure produced during its deposition. It is shown how various features of the deposited structure can be predicted with some accuracy. These features include the structure of isolated nodules, the influence of various substrate…
The system porous glass saturated with respect to water was studied in the temperature range +2 to -40 degrees. Calorimetric measurements with simultaneous observations on length changes revealed that two kinds of transformations took place at different temperatures below the normal melting point of bulk water. The am…
Abstract The structure of glassy carbon has been investigated by determining the interlayer spacing, crystallite size and disorganized carbon content, and by an analysis of the radial distribution function. Glassy carbon has been found to be a typical non-graphitizing carbon. From the analysis of the first peak of the…
The relation between cloth flexural rigidity and single-fibre flexural rigidity is discussed, and a mathematical formula is derived for the minimum cloth flexural rigidity, neglecting interactions between the fibres; this formula takes account of the twist and crimp in the yarns. An instrument is described which enabl…
Growth of 10 species of unicellular marine algae, representative of seven classes, in an enriched seawater medium was compared with growth in several artificial media. All media were buffered with glycylglycine, which was found to be less inhibitory than tris(hydroxymethyl)aminomethane. Growth of most species in natur…
Fourteen species of motile pennate diatoms obtained from a Georgia salt marsh were cultured under uniform conditions (19°—20°C, 16,000—23,000 lux) in soil—water medium at salinities between 1 and 68 %. All species grew well over at least the range of 10 to 30%; several species grew well over the entire salinity range.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution Coefficients for Certain Actinide and Fission Product Chlorides in the Immiscible Salt Systems: LiCl-KAlCl4.R. H. MooreCite this: J. Chem. Eng. Data 1964, 9, 4, 502–505Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Publishe…
Abstract The Theory of Crystallization of bulk linear polymers with chain folding is discussed in terms of recent developments. Specific topics covered are: (a) Rate of crystal growth and size of folded nuclei, (b) theoretical and experimental estimates of the fold surface free energy, and estimates of the surface fre…
By streaming potential measurements, the zero point of charge (zpc) of or‐Al 2 O 3 having a fully hydroxylated surface was found to occur at pH 9.2 ± 0.2. By calcining the alumina at temperatures above 1000°C, the zpc was lowered to about pH 6.7. By aging the calcined material in water at room temperature for a period…
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.
The refractive indices of ADP and KDP have been measured at 25 wavelengths between 2138 Å and 1.529 μ, and at 24.8°C. The measured values have been corrected to give absolute indices. Curves have been fitted to the measured and to the corrected data.The measured and the computed data are given both in air and in vacuu…
The ESR spectra of vanadyl acetylacetonate and tetraphenylporphyrin have been studied in various liquid solvents and frozen glasses. The spectra have been analyzed and the components of the g tensor and of the vanadium hyperfine interaction tensors have been determined, and for the porphyrin the nitrogen extrahyperfin…
Bayerite, fl-AI(OH)3, and boehmite, 7-A1OOH, both with crystallite sizes of some tenths of a micron, were used for this investigation.