Materials Literature
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Abstract Changes in the Poisson's ratio of natural vulcanized rubber due to elongation were investigated experimentally. The following results were obtained: If infinitesimal deformation at any instant during elongation is considered, it appears to be correct to take the Poisson's ratio at such instants as 0.5. If the…
Corrosion tests were run for periods up to 5000 hrs in borated water at 600 F (316 C) in a high velocity loop on strip, tubes, and weldments of Alloy 600. During the first 1000 to 2000 hrs of exposure, corrosion rate differences depending upon surface preparation and in the case of weld metal on composition were obser…
Glasses resistant to attack by sodium vapor at temperatures up to 700°C were developed from the CaO‐Al 2 O 3 ‐MgO‐BaO‐B 2 O 3 system. The resistance of these glasses decreases sharply above the transformation temperature. The glasses have a high water content, have good wetting properties, and adhere well to materials…
Far-infrared reflectivity spectra of NaNO 2 crystals were measured from 63 to 400 cm -1 over the temperature range from 85°K to 460°K. The results were analysed using a K.K. dispersion relation and the classical oscillator model. Five modes have been observed; the shifts in frequency are linear with temperature, and a…
Abstract The endoskeletal structure supporting the gill‐books of Limulus polyphemus has been investigated by means of light and electron microscopy, chemical analysis and x‐ray diffraction. This tissue is a cartilage which has significant correspondences with both vertebrate cartilage and plant tissues. Morphologicall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular energy transfer and sensitized luminescence in actinide(III) β-diketone chelatesLeonard J. NugentLeonard J. NugentMore by Leonard J. Nugent, J. L. BurnettJ. L. BurnettMore by J. L. Burnett, R. D. BaybarzR. D. BaybarzMore by R. D. Baybarz, George Knoll WernerGe…
The outgassing characteristics of 304 stainless steel with different surface treatments have been measured. The surface treatments investigated were: (1) glass-bead shot blasting; (2) electropolishing with a surface roughness of 20–25 μ in.; (3) electropolishing with a surface roughness of 4–6 μ in.; (4) one of the ab…
The anisotropy of heat conductivity that develops on uniaxial stretching of amorphous high polymers has been examined theoretically and experimentally. Experimental measurements on oriented polystyrenes and polymethylmethacrylates show a linear increase in conductivity (parallel to stretching) with increasing elongati…
It has been found that anions have a dual role in relation to the stability of the oxide film on mild steel. They contribute both to the destruction of the oxide film and to the passivation process in which the film is stabilised. The dependence of these functions on concentratinn differs, so that the aggressive actio…
Abstract Diffusion coefficients and solubilities of methane in polyisobutylene have been measured at four temperatures between 102 and 188°C. in the pressure range 23–341 atm. Diffusion coefficients extrapolated to atmospheric pressure range from 1.72 × 10 −6 cm. 2 /sec. at 102°C. to 1.5 × 10 −5 cm. 2 /sec. at 188°C.…
A new design of a low pressure sputtering system of magnetron type is described. The optimum sputtering conditions are discussed in relation to the system. It is shown that this system is able to produce uniform thin films with good reproducibility, and especially to produce a metal oxide film by reactive sputtering.…
Abstract Detailed crazing behavior in several plastic/rubber twophase polymer systems was studied by means of direct observation of ultrathin sections under the electron microscope by employing osmium tetroxide staining and hardening procedure. Samples used are ABS polymer, high ‐impact polystyrene and several PVC/rub…
The structure of pollucite from Rumford, Maine has been determined and refined. The space group is Ia 3 d with cell edge a = 13.69 Å. The structure was investigated using 213 independent reflection intensities measured on a single crystal diffractometer. Pollucite has the analcime framework with the cesium atoms occup…
Abstract Fine structures of several plastic/rubber two ‐phase polymer systems were studied by means of direct observations of ultrathin sections under the electron microscope using osmium tetroxide staining and a hardening procedure developed recently by Kato. Samples used are several types of both ABS polymers and hi…
Abstract Synopsis The diffusion of six solvents in three crosslinked, glassy epoxy polymers is studied. Case II swelling and Fickian sorption are observed as two simple limiting cases. The mechanism of diffusion changes from one limit to another as the nature of the solvent or the crosslink density of the polymer is a…
Summary The main advantage of high voltage in electron microscopy is greater penetration. When using an aperture of optimum size the thickness of specimen that can be imaged increases almost linearly with applied voltage in the case of light elements, both when the criterion is image intensity and when it is resolutio…
The dislocation sub-structure and surface markings formed during the early stages of fatigue in copper single crystals at room temperature were studied. For the first few cycles the structure is similar to that associated with stage I of tensile deformation. A three-dimensional network of interconnected veins packed t…
Abstract Weathering products formed on surfaces of both potassium and plagioclase feldspar (An 70 ), which were continuously leached in a Soxhlet extraction apparatus for 140 days with 7·21 of distilled water per day at a temperature of approximately 78°C, are morphologically identical to natural products developed on…
A relatively simple thin-film structure using vanadium dioxide is analyzed in detail to show that high-temperature, low-resistivity filaments can exist in VO2under appropriate electrical bias. These filaments will dominate both the static and dynamic electrical behavior of the structure, giving rise to V-I characteris…
An analysis of electron energy loss spectra of some 12 transition metal dichalcogenides has given useful information towards the understanding of the band structures of these layer-type solids. Using the experience gained from studying graphite in which the valence band consists of two groups, namely π and σ bands, a…