Materials Literature
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The fracture of fully dense, polycrystalline MgO with grain sizes 10 to 500μm, has been studied. Specimens had chemically polished, machined or annealed surfaces. Fracture in chemically polished specimens is initiated by plastic flow, whilst that in machined specimens occurs by the extension of the flaws produced by m…
This paper describes optical properties of thin electroformed metallic meshes in detail. Since the transmittance shows the bandpass character around the wavelength near the grid constant, metal mesh can be used as a bandpass filter. The reflectance is high in the wavelength region longer than three times the grid cons…
The infrared spectra (4000–650 cm−1) of a series of polyurethane elastomers synthesized from polytetrahydrofuran, diphenylmethane-4,4′-diisocyanate, and ethylenediamine were examined. By comparing the spectra with those of the constituent polytetrahydrofuran and of the model compounds for the hard segments of the elas…
Abstract The nucleation, growth and dissolution characteristics of potassium sulphate have been studied in a laboratory scale fluidized bed crystallizer under carefully controlled conditions of temperature, supersaturation and solution velocity. Aqueous solutions of potassium sulphate can withstand high degrees of sup…
This review emphasizes the fundamental physical principles which describe the growth and decay of the members of a series of radioactive substances. The mathematical procedures are held to the minimum essentials. Graphs and tables are provided for the illustrative case of the “daughter products” of radon (RaA, RaB, Ra…
Abstract Mechanical relaxation has been studied at 0.67 cps in linear polyethylene (LPE) and polytetrafluoroethylene (PTFE) between −190 and −20°C. Specimens were prepared by use of various thermal treatments to produce in LPE a range of crystalline fractions from 0.690 to 0.825 and in PTFE from 0.615 to 0.870. An emp…
Abstract An attempt has been made to assemble the best thermodynamic information currently available for soil minerals in the Al 2 O 3 -SiO 2 -H 2 O system at 25°C and 1 atm. Montmorillonite is included by considering its aluminum silicate phase. Diagrams are presented so that the stability of the minerals can be visu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel(II) complexes of cyclic tetradentate thioethersWilliam Rosen and Daryle H. BuschCite this: J. Am. Chem. Soc. 1969, 91, 17, 4694–4697Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published inissue 1 August 1969https://pubs.acs.org…
It has been shown that the force required to detach the holdfasts of Fucus vesiculosus depends upon the nature of the substratum; adhesion is less to barnacle shells. The loweradhesion appears to be due to a partial dissolution of the shell by acidic material, probably exndates. Growth of germlings on various substrat…
Abstract Published kinetic data for commercial water gas shift catalysts are interpreted in terms of pore diffusional effects. The Arrhenius plots of apparent activity show the curvature typical of the transition from reaction to pore diffusion control and the apparent activities of different catalyst pellets vary qui…
Abstract The structure of tohdite, 5Al2O3·H2O, was determined by Yamaguchi Yanagida, and Ono (1964). Least-squares refinements based on their structure have been carried out using X-ray-powder data. The final R factor of the reflection intensity reduced to 0.08 from the initial value of 0.26.
Abstract The “living” polymer method was used to prepare block polymers of vinyl monomers and isocyanates at low temperatures in toluene–tetrahydrofuran mixtures. Vinyl monomers and diisocyanates, which have one hindered isocyanate group, as in 2,4‐toluene diisocyanate, form block polymers which contain pendant reacti…
Strength and fracture properties of single and polycrystalline CaO are presented along with some optical and hydration properties. Single crystals have optical transmission from about 0.2 to 12 μm, wider than MgO in both the infrared and ultraviolet, but develop absorption, particularly at 2.75 μm, from atmospheric at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption and circular dichroic spectral studies of europium(III) complexes with sugar acids and amino acids, with remarks on hypersensitivityLeonard I. KatzinCite this: Inorg. Chem. 1969, 8, 8, 1649–1654Publication Date (Print):August 1, 1969Publication History Published o…
Contrast in a scanning electron microscope can arise from potential variations on the surface of the specimen or from a number of other causes such as the topography of the surface. A method is described whereby contrast resulting from potential variations on the specimen appears in the final display, whereas contrast…
The thermal conductivity of pure nickel and a number of dilute Ni -Co, Ni -Fe, Ni -Cu and Ni -Pd alloys has been measured in the temperature range 2-100 °K. An attempted separation of the measured conductivity into its electronic and lattice components indicates rather large deviations from the thermal equivalent of M…
Results are presented for the initial‐stage sintering of spinel in air at 1050° to 1300°C. Spinel powders of high purity were prepared from magnesium‐aluminum hydroxide coprecipitates by calcining at 1100°C for 4 h. The sintering mechanism is volume diffusion, and the temperature dependence of the apparent diffusion c…
The microstructure of the shell of bivalve molluscs was examined by lightand electron-microscopy. The purpose of this paper is to classify and describe this structure, and to discuss the affinity and evolutionary development among different kinds of shells. Shell structure consists of two elements, namely, the morphol…
The results of a study of the role of organic compounds in the formation of carlxmate crystals in marine biological systems are reported. In an increasing concentration of certain organic compounds which complex calcium ions, the proportion of aragonite decreases and that of calcite increases. In increasing concentrat…
Abstract Lactic dehydrogenase X, an isozyme found thus far only in mature sperm of mammals and birds, has been purified to homogeneity from rat tissue. A molecular weight of 125,000 ± 4,000 was determined. In addition to its ability to catalyze the pyridine nucleotide-linked interconversion of pyruvate and lactate, th…