Materials Literature
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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…
The temperature dependence of the 93Nb nuclear quadrupole coupling constant in stoichiometric LiNbO3 powder specimens was measured from 21 to 515°K. No phase transitions were observed in this range. Analysis of the data on a simple vibrational model gave an Einstein temperature of 514°K in excellent agreement with tha…
Ultracentrifugal analyses of the native silk proteins extracted from the various parts of the middle silk gland of the mature silkworm have revealed that there exist four components with S degrees (20,w) values of 10S, 9-10S, 9S, and 4S in the extract. It is suggested that the fastest 10S component is the native fibro…
Abstract When polymers are extruded from a capillary, the amount of extrudate swelling is generally found to be a function of shear rate and capillary dimensions. Experiments with polyethylene now show that when shear rate is replaced by an average transit time in the capillary, postextrusion swell becomes a function…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor pressures, mass spectra, magnetic susceptibilities, and thermodynamics of some phthalocyanine compoundsDean P. Bonderman, E. David Cater, and William Earl BennettCite this: J. Chem. Eng. Data 1970, 15, 3, 396–400Publication Date (Print):July 1, 1970Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProducts from the thermal degradation of some naturally occurring materialsE. Barr. Higman, Irwin. Schmeltz, and William S. SchlotzhauerCite this: J. Agric. Food Chem. 1970, 18, 4, 636–639Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Publ…
The valence isomerization of quadricyclene to norbornadiene is catalyzed by certain transition metal complexes of phthalocyanine and tetraphenyl porphyrin. To explore the dependence of catalytic activity on the number of d-electrons in the metal ion, complexes having a number of d-electrons from 5 to 10 were studied.…
Abstract A convenient pressure apparatus was designed for crystallization of high polymers under hydrostatic pressure up to 5000 atm. Melt crystallization as well as heat treatment under various temperatures and pressures was carried out on several polymers, and the effects of pressure on the molecular and crystal str…