Materials Literature
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The paramagnetic resonance spectrum of single crystals of RhCl3(PEt2Ph)3 doped with osmium has been measured at 77 K. No hyperfine structure is resolved and the g-tensor has principal values 3.32, 1.44 and 0.32. These values are analyzed using an extended form of the standard theory for low-spin d5, including configur…
A system has been devised for preparing permanent quantitative phytoplankton slides using sedimentation techniques. These slides can then be used with a conventional microscope. A three‐part settling chamber allows separation of the supernatant from the settled material. Water‐soluble mounting medium added to the samp…
Tensile tests at 300°C and structural examination have been carried out on specimens machined from annealed and cold-worked Zircaloy-4 fuel sheathing which had been neutron irradiated at 290°C. The stress-strain behaviour during testing at 300°C has been related to the microstructures observed by transmission electron…
A new and promising operating modus for the pebble-bed reactor has been investigated. Instead of circulating the fuel balls several times through the core they are moved only once slowly from the top to the bottom. Due to the increasing depletion toward the lower core area, there is a substantial axial tilt of the pow…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR studies of thermal decomposition mechanisms. II. Electron spin resonance study of the SO2- formation in the thermal decomposition of sodium dithionite, sodium and potassium metabisulfite, and sodium hydrogen sulfiteEdward G. JanzenCite this: J. Phys. Chem. 1972, 76, 2, 1…
The clay minerals in many estuaries of the eastern United States differ from those in the sediments of the rivers that feed these estuaries. Illite and chlorite are characteristic minerals of the estuaries as far south as Chesapeake Bay, yet chlorite is minor and illite is reduced in concentration in the rivers south…
Abstract Calculation methods for the evaluation of the parameters g, D and E for an S = 1 system, from paramagnetic resonance powder spectra are discussed and applied to a number of compounds having the general formula Ni(ligand) 6 (anion) 2 ; in this formula the ligands are nitrogen donors such as nitriles, pyrazoles…
Serrated yielding during the deformation of polycrystalline magnesium–tO wt.-% silver solid solution is reported. The effect of testing temperature and soluteatom concentration on the deformation behaviour is discussed and the dislocation structure developed during jerky flow is examined. The serrated yielding in this…
Abstract Glassy polyamide 6 was obtained by quenching the melt in liquid toluene at 210°K. On the DSC thermogram of such a polyamide a small endothermic peak of glass transition at 310°K, and an exothermic peak at 325°K of cold crystallization are observed (both temperatures were calculated by extrapolation to zero he…
Abstract
It is often commented that the practice of catalysis has preceded its understanding. The comment is nowhere more valid than in the area of catalytic action on transition metal surfaces which is the primary basis of the present review. We shall attempt here to survey some developments which have brought about a renewal…
A comparison of the creep behaviour of sintered magnesium powder and magnesium prepared by conventional methods has been made. Sintered material has a higher strength and quite different creep characteristics, which have been attributed to the presence of a magnesium oxide particle dispersion. Re-examination of all th…
Human serum albumin has three hydrophobic binding sites for bilirubin, one high affinity and two subordinate sites. At pH 7.4 the two molecules of bilirubin bound at the latter sites are unstable, since the equilibrium concentration of free bilirubin is higher than the solubility. Co-crystallization takes place, resul…
In tensile strength experiments of highly drawn crystalline polymers by using electron spin resonance the appearance of radicals is observed all over the strained sample long before its fracture. It is generally considered that the radical formation is the consequence of rupture of the most strained tie molecules. The…
The relative potentials of tin, steel, and tin-iron alloy play an important role in controlling the corrosion of tinplate containers used for foods. Stannous ion, pH, and adsorbedfilms influence these potentials. Stannous ion concentration is determined by the complexing strength of certain anions common to foods. The…
The following results were obtained from investigation of DSC thermograms of silk fibroin.1. The decomposition temperature of the crystalline region of silk fibroin is estimated to be about 348°C from the DSC thermograms of the hydrolysis residue.2. Silk fibroin is changed thermally into unoriented β-type by the treat…
Phonon scattering by dislocations was studied by measuring the thermal conductivity of deformed LiF crystals from 1.5 to 300 K. The conductivity is not proportional to T 2 , as observed by Sproull et al. , but is approximately proportional to T 3.5 or to T 3 depending on the deformation mode. After annealing at 300°C…
Abstract A study has been made on the tensile properties of mats of fibrillar polyethylene crystals grown at various temperatures from stirred xylene solutions in a Couette‐type instrument. The stress‐strain behavior of fibrillar crystals precipitated above 100°C was found to be essentially Hookean, and the maximum va…
The experimental observations of temperature oscillations in liquids and gases undergoing free convection are reviewed. The theoretical methods used to study problems of this type are indicated, and the extent to which current theory can account for the observations is discussed. Evidence for the occurrence of convect…
Abstract A procedure is described for the analysis by computer of the output from a differential scanning calorimeter. Enthalpy calibration with a variety of materials confirms that alumina is excellent for this purpose. Both the crystallinity, x T , and the heat of fusion of polyethylene, ΔH T , vary with temperature…