Materials Literature
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Magnetostriction constants were determined by means of a strain gauge at temperatures from -180 to 85°C on monocrystals of Mn–Zn–Fe ternary ferrites. For almost all specimens λ 111 was positive and λ 100 was negative. The values of λ 100 were small for the compositions with excess Fe 2 O 3 , whereas λ 111 's were smal…
Abstract It is suggested that all of the morphological forms commonly observed in high polymers are closely related. These forms are considered to represent different stages in a development from single crystal into spherulite under the influence of species rejected by growing crystals. Single crystals undergo this tr…
Fluorescence quantum efficiency of several β-diketone chelates of Tb3+, Eu3+, and Sm3+ in solutions have been measured at 300°K. The highest quantum yield of the solutions investigated is found to be approximately 50%. The quantum efficiency is found to be dependent on the nature of the solvent, but is fairly independ…
The long-range elastic interactions between dislocations and loops, both prismatic and shear, have been calculated for an isotropic medium. From the energy of interaction the magnitude and direction of the forces acting in the slip directions of both the dislocation and the loop have been derived and compared with the…
Abstract Crosslinked polychloroprene samples were allowed to crystallize from the melt at various fixed elongations. X‐ray diffraction studies revealed that the c axis becomes oriented toward the stretching direction, while the a and b axes are randomly distributed about the c axis. The alignment of the crystallite c…
We propose to demonstrate that a coherent description of pyrolytic graphite (PG) layer-plane phenomena can be based on a parabolic two-band system with cylindrical equal-energy surfaces. In this simple two-band model (STB model), band overlap and effective mass must be interpreted as phenomenological parameters to be…
(IN TWO VOLUMES) Edited by P. Grivet and N. Bloembergen London: Columbia University Press. 1964. Pp. xxix + 1923. Price 154s. two volumes. The Third Quantum Electronics Conference was held in the Palais de l'UNESCO in February 1963. It was attended by 1100 people representing, as Bloembergen pointed out, a growth rate…
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.…