Materials Literature
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A series of carbon-14 measurements of 18th- and 19-century wood revealed an excellent correlation between the variations in carbon-14 content and average sunspot activity. It seems probable, therefore, that the predominant cause of the short-term fluctuations in carbon-14 activity is the variability of solar activity.
Abstract: A limited study of the compound U₃Si₂ has been made in reference to its use as a prospective nuclear fuel in sodium cooled reactors.
Abstract E.p.r. and endor spectra have been measured in ThO2 containing Tb4+. The crystalline electric field is cubic, and the splittings are very large compared with other S state ions. The values of the parameters in the standard cubic spin-Hamiltonian are: g = 2·0146 ±0·0004, 60B4 = —2527·53 ±0·10 Mc/s, 1260B6 = —2…
We show that the x-ray scattering from an electron gas in the large-momentum-transfer regime ($k\ensuremath{\gg}\frac{{P}_{F}}{\ensuremath{\hbar}}$) is a direct measure of the one-dimensional momentum distribution of the particles (including correlations). If the recoiling electron's momentum is measured in coincidenc…
The thermal conductivities of $\ensuremath{\beta}$-rhombohedral boron, orthorhombic (black) phosphorus, and orthorhombic sulfur have been measured down to 3\ifmmode^\circ\else\textdegree\fi{}K. These results, as well as some from the literature on cubic (white) phosphorus and on boron carbide, have been interpreted by…
Recent studies on x-ray and electron-excited luminescence (cathodoluminescence) in natural and synthetic diamond provide evidence that the previously reported band-$A$ luminescence is due to the radiative recombination across the indirect energy gap of electrons and holes separately trapped at donor and acceptor cente…
In previous papers we have formulated the theory of magnetostriction arising from single-ion crystal-field effects, for cubic crystals, and we have shown that the theory accounts extremely well for the temperature dependence of the magnetostriction in yttrium iron garnet. We here summarize that theory, extend it to ar…
Proton magnetic resonance spectra of a number of paramagnetic Ni II chelates of the type NiL1L2 where L1 and L2 are different aminotroponeimine ligands have been examined. The proton resonances show large hyperfine contact interaction shifts due to delocalization of spin density from the metal to the ligand by dπ—pπ b…
The correlation-function method is used to describe the dielectric relaxation behavior of liquids and directionally isotropic crystalline phases. The physical model used is that of a regular mixture of dipole molecules and vacancies on a lattice, i.e., the equivalent of the Bragg—Williams approximation. To calculate t…
A mass spectrometer has been used to study the kinetics of the oxygen—tungsten reaction over the temperature range 1400° to 3150°K at oxygen pressures as high as 2×10−4 Torr. The main products of chemical reaction are identified as W3O9, W2O6, WO3, and WO2; their intensities are given as a function of surface temperat…
The effective diagonal-exchange parameter ${J}_{\mathrm{eff}}(0)$ which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Oxygen and Nitrogen on Molecular Sieves.R. M. Thorogood, G. M. Wilson, and J. M. GeistCite this: J. Chem. Eng. Data 1965, 10, 3, 269–274Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMolten Sulfur as a Solvent in Infrared Spectrometry.T. K. Wiewiorowski, R. F. Matson, and C. T. HodgesCite this: Anal. Chem. 1965, 37, 8, 1080Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Published inissue 1 July 1965https://pubs.acs.org/doi/…
Bowles, Jean A. (University of Colorado School of Medicine, Denver), and William Segal. Kinetics of utilization of organic compounds in the growth of Mycobacterium tuberculosis. J. Bacteriol. 90:157-163. 1965.-To obtain a workable system for a study of the kinetics of nutrient utilization (based on specific quantitati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Thorium Monophosphide, ThP1-x, and Phase Studies of the Partial System Th-ThPKarl A. Gingerich and Daniel W. WilsonCite this: Inorg. Chem. 1965, 4, 7, 987–993Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Publ…
Cotton fibers from bolls harvested at 5-day intervals beginning at 20 days after flowering and ending at 50 days ( when the bolls had opened on the plant) 'were preserved in three ways for study in the never-dned state. Preservation was accom plished in 70% aqueous ethanol, 50% aqueous dioxane, and by freezing. Measur…
Abstract Viscoelastic properties of unsaturated polyesters were investigated in the glass‐rubber transition region in relation to the temperature dependence of specific volume. Polyesters which are homologous with respect to crosslinking density were prepared by using mixtures of succinic and fumaric acid as the dibas…
Abstract The techniques involved in dynamic thermal gravimetric analysis are reviewed. Methods of studying overall kinetics of degradation, especially with respect to evaluation of order of reaction and overall activation energy, are outlined. Some applications to polymers such as Teflon and epoxide resins are describ…
Abstract Recrystallization of amorphous cellulose prepared by saponification of cellulose triacetate in an non‐aqueous medium was found to occur only at very high relative humidities, i.e., near 100%. At lower relative humidities the amount of recrystallization occurring was slight though significant. Correspondingly,…
Drastic decreases in the thermal conductivity upon deformation similar to those reported by Sproull, Moss, and Weinstock have been found in NaCl, KCl, and NaF crystals. Unexpected differences in the frequency dependence of the phonon—defect relaxation times lead to an investigation of whether point defects, created du…