Materials Literature
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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…
The EPR spectrum of isolated ${\mathrm{Cu}}^{+2}$ ions in NaCl obeys an axial spin Hamiltonian at low temperatures with ${g}_{\ensuremath{\parallel}}=2.373$, ${g}_{\ensuremath{\perp}}=2.07$, ${A}_{\ensuremath{\parallel}}=95$ G, ${A}_{\ensuremath{\perp}}=40$ G, ${Q}^{\ensuremath{'}}=20$ G with the $z$ axis lying parall…
A modified Ramsauer technique has been used to measure the total low-energy scattering cross sections of electrons in ${\mathrm{O}}_{2}$ over an energy range from 2.35 to 21 eV, and in Ne over a range from 0.37 to 20 eV. A broad clearly defined "bump" is observed in the $e\ensuremath{-}{\mathrm{O}}_{2}$ cross section…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the barium salt of an antibiotic containing a high proportion of oxygenSuzanne M. Johnson, Jeannie Herrin, Shui Jan Liu, and Iain C. PaulCite this: J. Am. Chem. Soc. 1970, 92, 14, 4428–4435Publication Date (Print):July 1, 1970Publication Hi…
A theory of translational and orientational melting with application to liquid crystals is presented in a manner analogous to that of Kirkwood and Monroe by introducing both translational and orientational order parameters.
Abstract In a continuation of previously reported work of the effect on cotton cellulose of ethyleneurea crosslinking agents modified with ring substituents of varying hydrogen‐bonding capabilities, accessibilities of the cellulosic hydroxylic protons to exchange with deuterium oxide vapor were determined by means of…
A mechanism for relating the redistribution of ions in a periodic stress gradient to internal friction peaks is proposed. The calculated internal friction peak is broad and asymmetric, and the frequency of maximum loss is proportional to the conductivity of the material, as is found experimentally, for silicate glasse…
Abstract Differential thermal analysis has been used to study the fusion of aqueous thermally reversible gels of gelatin and polyacrylylglycinamide (PAG). In the case of gelatin gels, endotherms close to the melting point are readily observed and these are sometimes preceeded by a small exothermic heat of gel reorgani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the acetylacetonimine adduct of ytterbium acetylacetonate, Yb(C5H7O2)3(CH3COCH = C(NH2)CH3)Mary Frances Richardson, P. W. R. Corfield, Donald E. Sands, and Robert E. SieversCite this: Inorg. Chem. 1970, 9, 7, 1632–1638Publication Date (Prin…
The flexural vibrations of ship-like structures are easily excited by underwater explosions, particularly if the explosion bubble period approximately synchronizes with a period of flexural vibration. A summary of the theoretical analysis shows how the transient motions are related to the principal vibration modes of…