Materials Literature
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Solid solutions in the system YPO4–YVO4, with and without 2 mol% of Tb3, were studied to determine the reason for the total inactivity of Tb in YVO4. The comparison of the diffuse reflectivity of Tb-containing solutions with that of Tb-free ones shows a uv absorption at energies below the absorption edge of YVO4 in ma…
Magnetic susceptibility and low-temperature specific-heat measurements have been made on several specimens of polycrystalline high-purity titanium, and in the case of the former measurement, on four single crystals. The calorimetric results are in good agreement with previously published data. A critically assessed av…
The quantum yield of a semiconductor thin-film photocathode, operating in the transmission mode, has been derived from the continuity equation and light multiple reflections within the film and the substrate. The fit between experiment and theory is good for hv<1.7 eV. The differences between experiment and the…
The optical constants of amorphous Ge films formed under well-defined conditions have been determined in the 0.1-25.0-eV spectral range. In the 0.1-1.8-eV range they were determined by analysis of precise reflectance and transmittance data ($\mathrm{RT}$), and in the 0.1-25.0-eV range by a Kramers-Kronig analysis of n…
Crystals of lactate dehydrogenase (LDH) were frozen by equilibration in a sucrose-ammonium sulfate solution, and then dipping into liquid nitrogen. The rate of radiation damage for frozen crystals was tenfold less than for crystals at room temperature. The physical properties of frozen crystals are discussed. Analysis…
Aluminum spheres were fired vertically into dry quartz sand in the light-gas gun facility at the NASA Ames Research Center. A velocity of 6.37 km/sec and a chamber pressure of 150 μ were used for all shots. Using an estimated impact pressure of 500 kb, heating of the target was computed to be 26% of the initial projec…
Abstract The morphology of porous anodic oxide films formed on aluminium in phosphoric acid electrolytes at constant current density or voltage, and under changing electrical or electrolytic conditions, has been studied quantitatively by electron microscopy. Replicas from film sections and from both film interfaces ha…
Using de Vries's model, we predicted theoretically that phase matching of optical third-harmonic generation can be achieved in cholesteric liquid crystals. The prediction was verified by measurements of third-harmonic generation from a mixture of cholesteryl chloride and cholesteryl myristate.
Amorphous clay separated from pedons of a highly weathered soil previously classified as Oxisol and an Ultisol of the Southern States and, from the surface horizons of an Oxisol and two Andepts of the tropics were studied by chemical, DTA, infrared and X‐ray analysis. Considerable amounts of amorphous material, 20–37%…
A study was made of the migration behavior of filaments in a 3-layer structure of 19 filaments. The filaments were twisted in two distinct forms: (a) ribbon-twisted and (b) cylindrical-twisted. The form of twisting was found to have an appreciable effect on the migration behavior of filaments. The frequency of migrati…
Abstract Expansion of a small spherical hole in a highly elastic solid is treated theoretically. Both elastic and surface energy terms are considered; the corresponding surface forces are assumed to be additive. The surface energy of the elastomer is assumed to be similar to that of simple liquids. Pressures or triaxi…
The nature of attack on unstressed iron and the mode of cracking in stressed iron during immersion in boiling Ca(NO3)2, NaNO3, NH4NO3 solutions and various mixed Ca2+ and NH4+ solutions have been followed by microscopic examination of specimens removed from the solutions at various fractions of the mean failure time a…
The x-ray diffraction characteristics of potassium acid phthalate (KAP) crystals have been measured with a vacuum two-crystal x-ray spectrometer using a flowing-gas proportional counter as a detector. The values of resolving power, percent reflection, and coefficient of reflection as determined from the (1, −1) positi…
Summary and Conclusions Thermal expansion measurements of composite systems containing hard dispersions embedded in brittle and semibrittle matrices indicate the importance of (1) the magnitude of the stress developed in the matrix and (2) the crack propagation behavior of the matrix. The thermal expansion of these co…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. D. Feichtner, R. Johannes, and G. W. Roland, "Growth and Optical Properties of Single Crystal Pyrargyrite (Ag3SbS3)," Appl. Opt. 9, 1716-1717 (1970)…
A pulsed atomic-oxygen beam is used to investigate the interaction of atomic oxygen with various surfaces at a pressure of 10−7 torr. The probability that an atom after striking a surface will return to the gas phase as an atom is measured for Pyrex, stainless steel, Teflon, gold, and titanium and is found to lie betw…
X radiation (Cr $K\ensuremath{\beta}=2.08$ \AA{}) scattered by lithium, beryllium, and graphite at angles of 5\ifmmode^\circ\else\textdegree\fi{}, 10\ifmmode^\circ\else\textdegree\fi{}, and 15\ifmmode^\circ\else\textdegree\fi{} was analyzed. Besides the known Rayleigh and Compton radiations, a new component, character…
Abstract Soils on the upper and middle Coastal Plain surfaces in North Carolina have been exposed to surface weathering for about 3‐ to 10‐million years. This makes it possible to evaluate the effect of soil formation of long duration on soil properties. Solum thickness, percentage of soils with plinthite, and gibbsit…
Abstract Water adsorption by interlamellar complexes of poly(ethylene glycols) and montmorillonite has been determined using a silica spiral spring, and supplementary data obtained by X-ray and infrared techniques. The adsorbed water enters the interlamellar region, where it is associated with the exchangeable cation.…
Pyrex spheres (0.15-mm diam) accelerated to a velocity of 15 km/sec by a plasma rail gun were used to produce holes in thin stainless steel and aluminum targets. The velocity was measured by time of flight, using a photomultiplier to detect the time at which a thin target was penetrated. The sphere diameter was measur…