Materials Literature
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Absorption, fluorescence and decay-time measurements are presented for calcium metaphosphate glass containing tin or antimony. The bands observed have been assigned to the 1 S 0 -> 3 P 1 transition (A band) of the ions Sn 2+ and Sb 3+ . It is suggested that the splitting of the A band may be due to a dynamic Jahn-Tell…
The dry distillation method was studied for rapid separation of 99mTc from neutron irradiated MoO3. Upon heating, 99mTc produced in MoO3 crystal by the 98Mo(n,r)Mo99m β→ 99mTc process was found to be released by diffusion. From observations made of the deposition temperature, it was concluded that 99mTc was present in…
The boundary-value problem for a constrained elastic cylinder under axial load is solved for the correct boundary conditions, in terms of set of infinite orthogonal Bessel and trigonometric functions. The orthogonality conditions are chosen on the basis of surface deformations noted during the experiments. Analysis is…
The variability of oxalate- and dithionite-extractable iron and aluminum throughout the soil profile and their relationship to total iron and clay contents were investigated for soils representative of the Chernozemic, Solonetzic, Luvisolic and Gleysolic soil orders of Saskatchewan. These distributions and relationshi…
An investigation is described into partial discharge phenomena in artificial air-filled cavities of known dimensions in polyethylene. During initial tests, the 50 percent impulse-inception stress is much higher than the discharge stress calculated from Paschen's curve. It is independent of the impulse repetition rate,…
The first part of the paper is concerned with stress-softening in rubber vulcanizates. Recent theories are briefly discussed and results are presented to demonstrate the authors' theory that the phenomenon of stress-softening in filled vulcanizates is due to the gum phase of the composite. A simple model demonstrating…
Abstract The highly reactive compound bis(trimethylsilyl)diimine (BSD), which was first prepared by oxidation of lithium tris(trimethylsilyl)hydrazide, is light blue, sensitive to thermolysis and hydrolysis, and ignites spontaneously in air. On the basis of electron transfer, acid‐base, or free‐radical reactions, it a…
Abstract A model of a fibrous bed coalescer is presented which relates the collision frequency between particles and fibers to the overall coalescence frequency. The model will predict the ratio of outlet to inlet particle number densities (Y) and takes into account the mean inlet particle size, mean fiber size, void…
The lattice vibrations of a layer compound having the MoS2 structure are derived using the Born-von Kármán model in the nearest-neighbours approximation for single layers. The analysis produces a set of secular equations which are solved around the Brillouin zone; the corner of the zone yields particularly interesting…
At 20°C and for all moisture contents, the mechanical behavior of wool fibers up to 1% extension in the Hookean region is linear viscoelastic. The equilibrium Young's modulus, based on the wet cross-sectional area of the wool fiber, is inde pendent of moisture content and is equal to 1.4X 10 10 dynes-cm 2 . The dynami…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-precision viscosity of supercooled water and analysis of the extended range temperature coefficientBruno J. Zwolinski and Lawrence D. EicherCite this: J. Phys. Chem. 1971, 75, 13, 2016–2024Publication Date (Print):June 1, 1971Publication History Published online1 May 20…
Abstract The relations between generation, glide, and annihilation of dislocations during plastic deformation are represented in terms of control theory. It is inferred that the rate of steady‐state deformation is proportional to the rate of dislocation annihilation and that annihilation is even rate‐controlling at le…
Proteins have been coupled to insoluble polysaccharides following periodate oxidation to produce reactive aldehyde groups which will react with side chain amino groups of proteins. The coupling is stabilized and unreacted aldehydes blocked, by reduction with sodium borohydride.
Abstract Corona treatment of low‐density polyethylene in oxygen or oxygen‐containing gases produced bumps on the surface, while treatment in nitrogen, hydrogen, argon, or helium caused no detectable surface change. Bumps made by an oxygen corona increased in size with time and temperature of the treatment. The bumps w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and chemistry of the porphyrins. Crystal and molecular structure of the monohydrated dipyridinated magnesium phthalocyanine complexDavid H. Templeton, Mark S. Fischer, Allan Zalkin, and Melvin CalvinCite this: J. Am. Chem. Soc. 1971, 93, 11, 2622–2628Publication Da…
Deposition of atomic beams of potassium and rubidium with oxygen molecules at high dilution in argon together on a salt window at 15°K produces the KO2 and RbO2 molecules, as identified by infrared spectra. Secondary reaction yields the KO2K and RbO2Rb molecules. Oxygen isotopic mixtures and simultaneous deposition of…
The critical field strength at which a classical domain wall moves through a perfect ferromagnetic crystal of simplified structure is calculated as a function of the ratio between anisotropy energyKand ferromagnetic coupling energyC, taking into account the discrete nature of the spins. WhenKapproachesCintrinsic wall…
The homopolymers poly(methyl methacrylate) and poly(ethyl methacrylate) are compatible with poly(vinylidene fluoride) when blended in the melt. True molecular compatibility is indicated by their transparency and a single, intermediate glass transition temperature for the blends. The T g results indicate plasticization…
The Monte Carlo technique using a simple single scattering model, different from Reimer's, is applied to the field of the Electron Probe Microanalyzer (EPMA) and the Scanning Electron Microscope (SEM). The calculations show fairly good agreement with the experiments on back-scattered electrons, energy dissipation, cha…
We develop a theory, valid for large friction, for the rate of conformational (rotational isomeric state) transitions in polymers. Such changes are classified according to the effect which the transformation in a finite portion of the molecule has on the attached polymeric chains. Major consideration is given to type…