Materials Literature
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The ferrimagnetic spinels ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$, Ni${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$, Co${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$, Mn${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$, and Mg${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$ have been prepared and studied with the M\"ossbauer-effect technique over a wide temper…
Within a two-state formalism, a systematic procedure is developed for deriving the difference between the gerade and ungerade state potentials from resonant charge-exchange total cross sections. It is shown that three potential constants may be derived from (i) the relative monotonic velocity dependence of the cross s…
A method is described for the complete calculation of electronic energies in crystalline solids without approximating overlap, electron-repulsion, or exchange contributions. The practicality of the method is confirmed by preliminary results, which also indicate reasons for the considerable success of independent-elect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRates of substitution of some diacidobis(ethylenediamine)iridium(III) complexesRobert A. Bauer and Fred BasoloCite this: Inorg. Chem. 1969, 8, 11, 2237–2242Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 196…
Basswood, eastern white pine, and sugar maple samples were impregnated with three different monomers, using various treatment conditions, and cured by the catalyst-heat technique. Monomers were t-butyl styrene, Heilman-Gulf epoxy monomer, and methyl methacrylate. Hygroscopicity, dimensional stability, static bending,…
Abstract The exchange complex of two organic soils from the Sacramento‐San Joaquin delta of California was easily saturated with calcium. However, the Ca 2+ of the calcium‐saturated soil was difficult to replace with Na + even when the calcium‐saturated soils were leached with 1 N NaCl. Exchange of the Ca 2+ by Na + w…
The eflect of porosity on the thermal conductivity of sintered ThO2 of densities ranging from 90 to 95% of theoretical density was investigated at 20°C. The thermal conductivity was determined by means of laser pulse. Discrepancies were observed between the experimental results and the relation derived by Loeb. This d…
The synthesis of zircon from ZrO 2 and SiO 2 at fixed temperatures from 1200° to 1400°C was studied as a function of time up to 16 h. Quantitative X‐ray diffraction was used to estimate the phases in the product. Quartz transforms to cristobalite through an amorphous transitional phase. Assuming a homogeneous reaction…
Abstract The cation exchange capacities versus pH of 12 soils from 10 states were determined by measuring Ba adsorbed by the unlimed soils from buffered solutions adjusted from pH 2.5 to 8.0, and K adsorbed from 1.0 N KCl by incrementally limed (and incubated) soils. The contributions of organic matter and clay to soi…
The electrical resistivity and Seebeck coefficient have been measured on a series of hot-pressed Ge-Si alloys over the temperature range 300-1200 °K and Hall mobility in the range 300-1000 °K. The results indicate that some specimens possess mobilities and Seebeck coefficients close to single-crystal values. Making us…
A method and apparatus for plotting automatically the secondary electron emission yield curves from metals in an ultra-high vacuum environment are described. The yield curves from metals can be plotted in times of only a few seconds before the surfaces become contaminated. In addition, both the variation of the back-s…
Two cylindrical specimens of UO2 were irradiated in the Oak Ridge Research Reactor at temperatures up to 1700°C. Both specimens were of natural enrichment uranium (0.7% 235U) but one specimen was a single crystal and the other had a fine-grain microstructure. The fission-gas release from these specimens were affected…
Abstract Data existing in the literature for the spherulitic growth rate of molecular weight fractions of linear polyethylene, poly‐(tetramethyl‐ p ‐silphenylene)siloxane, and trans ‐1,4‐polyisoprene have been analyzed according to nucleation theory on taking into account the influence of chain length on the free ener…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromism of 1,2-dihydroquinolinesJaroslav Kolc and Ralph Sherman BeckerCite this: J. Am. Chem. Soc. 1969, 91, 23, 6513–6514Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi/10…
The chemical nature of the electron-dense areas appearing on the organic matrix during the early stage of shell regeneration in Helix has been ascertained. These areas of 500–5000 Å are made up mainly of acid mucopolysaccharides as detected by thorium staining. When treated by 1% phosphotungstic acid (PTA) for a short…
Reactions between corundum and cristobalite in mixed powders and at interfaces between sintered pellets at 1500°C and in various forms of reaction couples at 1550°C were studied by quantitative X‐ray diffraction, electron microprobe analysis, and optical microscopy. The results indicate that a noncrystalline product i…
Crystalline gallium mycobactin P and chromic mycobactin P have been prepared. The chromic compound, unlike other metallic complexes of mycobactin P, does not detectably exchange its metal with ferric iron; it competitively antagonizes the growth-promoting action of mycobactin P towards Mycobacterium johnei. Mycobactin…
1. Mg(2+) or Mn(2+) starvation causes suspensions of Bacillus subtilis strain W 23 to accumulate bound amino sugars that are soluble in trichloroacetic acid. 2. The presence of chloramphenicol or puromycin produces higher intracellular concentrations of amino sugars during Mg(2+) starvation, but neither compound can s…
Abstract An investigation is carried out to determine the onset of convection of a horizontal layer of liquid subject to temperature of T 1 and T 2 at lower and upper surfaces, respectively. The liquid is assumed to possess a maximum density value at T max with T max between T 1 and T 2 . The temperature‐density relat…
Microstructural changes preceding the formation of the equilibrium (α-Al2O3) phase in non-stoichiometric magnesium-aluminium spinel have been examined by electron microscopy. Two intermediate phases have been identified which nucleate on paired partial dislocations in the spinel matrix. Both phases have monoclinic sym…