Materials Literature
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Fourteen species of motile pennate diatoms obtained from a Georgia salt marsh were cultured under uniform conditions (19°—20°C, 16,000—23,000 lux) in soil—water medium at salinities between 1 and 68 %. All species grew well over at least the range of 10 to 30%; several species grew well over the entire salinity range.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution Coefficients for Certain Actinide and Fission Product Chlorides in the Immiscible Salt Systems: LiCl-KAlCl4.R. H. MooreCite this: J. Chem. Eng. Data 1964, 9, 4, 502–505Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Publishe…
Abstract The Theory of Crystallization of bulk linear polymers with chain folding is discussed in terms of recent developments. Specific topics covered are: (a) Rate of crystal growth and size of folded nuclei, (b) theoretical and experimental estimates of the fold surface free energy, and estimates of the surface fre…
By streaming potential measurements, the zero point of charge (zpc) of or‐Al 2 O 3 having a fully hydroxylated surface was found to occur at pH 9.2 ± 0.2. By calcining the alumina at temperatures above 1000°C, the zpc was lowered to about pH 6.7. By aging the calcined material in water at room temperature for a period…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The refractive indices of ADP and KDP have been measured at 25 wavelengths between 2138 Å and 1.529 μ, and at 24.8°C. The measured values have been corrected to give absolute indices. Curves have been fitted to the measured and to the corrected data.The measured and the computed data are given both in air and in vacuu…
The ESR spectra of vanadyl acetylacetonate and tetraphenylporphyrin have been studied in various liquid solvents and frozen glasses. The spectra have been analyzed and the components of the g tensor and of the vanadium hyperfine interaction tensors have been determined, and for the porphyrin the nitrogen extrahyperfin…
Bayerite, fl-AI(OH)3, and boehmite, 7-A1OOH, both with crystallite sizes of some tenths of a micron, were used for this investigation.
Abstract On oxidation of graphitic carbon, acidic surface oxides (or hydroxides in the presence of water) are formed at the boundaries of the carbon layers. It was found that the reaction of oxygen with microcrystalline carbon at 400–450°C yields four groups of different acidities. One strongly acidic group and one we…
The barrier‐layer model previously proposed to explain the anomalous increase in resistivity that occurs in doped BaTiO 3 has been reexamined in the light of data obtained from more recent experiments. The picture thus obtained describes correctly and quantitatively the resistivity anomaly and the frequency and voltag…
The interaction between particles and an advancing solid-liquid interface has been investigated both experimentally and theoretically. For each particular type of particle, a ``critical velocity'' was observed, below which the particles are rejected by the interface, and above which they are trapped in the solid. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Orbital View of Chemisorbed Carbon MonoxideGeorge BlyholderCite this: J. Phys. Chem. 1964, 68, 10, 2772–2777Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Published inissue 1 October 1964https://pubs.acs.org/doi/10.1021/j10079…
Abstract The nature of the electronic-vibrational states of a d9 ion in an octahedral complex is discussed in term s of an adiabatic model in which th e electronic motion follows the nuclear motion exactly. Expressions for the g-values and the hyperfine structure parameters of the e.s.r. spectrum at high and low tempe…
The resistance of VO2 through the semiconductor-to-metal transition has been measured as a function of hydrostatic pressure. The transition has been studied in pure and partially hydrated single crystals of VO2 and in powdered VO2. The temperature of the transition is shifted by less than 0.5 C° by pressures up to 6×1…
The effect of very high pressure has been studied on the electronic structure of some fused-ring aromatic hydrocarbons. The material most thoroughly studied is pentacene. Observations include optical absorption of the low-energy peaks and electrical resistance. The optical absorption peaks of tetracene and pentacene s…
The magnetic and structural characteristics of 11 intermetallic compounds represented by the formula LnNi are reported. The five compounds with Ln=Dy, Ho, Er, Tm, and Y are isomorphous and occur in the FeB structure. The others, with Ln=Ce, Pr, Nd, Sm, Gd, and Tb, form in the CrB structure, YNi and CeNi exhibit only P…
The effect of pressure to 300 kbar has been measured on the volume and on the lattice parameters ($c$ and $a$) of the hcp magnesium lattice. The $a$ axis compresses in a regular manner, but the $c$ axis compresses relatively rapidly to 70 kbar, then becomes continuously more incompressible in the range 70-120 kbars, w…
Measurements of the change in thermal conductivity of high-purity single-crystal GaAs were made upon 2-MeV electron irradiation and annealing. Two GaAs samples were irradiated at maximum temperatures of 100 and 80\ifmmode^\circ\else\textdegree\fi{}K. A linear increase in the additive thermal resistivity near 50\ifmmod…
Methods for treating boundary-value problems involving helicon waves (whistlers in solids) are developed and used for infinite plates and cylinders. The magnetoplasma inside the solid is assumed to be "driven" by means of external coils, which set up an oscillatory field with sinusoidal variation along the two coordin…
Trapping levels which account for most of the thermoluminescence in natural calcite have been investigated. Results are based on a study of color centers which are shown to be closely associated with the traps involved in thermoluminescence. Optical absorption measurements in a variety of Iceland-spar crystals show th…