Materials Literature
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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…
1. Glucosamine 6-phosphate deaminase [2-amino-2-deoxy-d-glucose 6-phosphate ketol-isomerase (deaminating), EC 5.3.1.10] of Bacillus subtilis has been partially purified. Its K(m) is 3.0mm. 2. Extracts of B. subtilis contain N-acetylglucosamine 6-phosphate deacetylase (K(m) 1.4mm), glucosamine 1-phosphate acetylase and…
Journal of the Physical Society of Japan 58 (1989) pp. 3106'3110 Ising Model with Even-Bonds Plaquettes on the Square Lattice Tsuyoshi Horiguchi Journal of the Physical Society of Japan 67 (1998) pp. 2300'2305 Explicit KF-Percolation Transitions in 2D Strongly-Frustrated Spin Systems Hideo Ikeda and Yasuhiro Kasai Jou…
An electron spin resonance study of vanadyl phthalocyanine magnetically diluted in metal-free and zinc phthalocyanine salts, and in sulfuric acid solution, confirms the placement of the 3d unpaired electron in the dxy singlet orbital of the vanadium ion. An improved method of synthesis for vanadyl phthalocyanine which…
M easurem ents were m a de on r efractive index changes with h yd ro static pressures between 1 ba r a nd 1 kbar usin g the h elium yellow line . Thc ma te rials studies were: KBr NaCI, LiF, diamond, MgO, quartz, A120 3, a nd t hree silicate glasses. All t he materials increased in refractive index with pressure excep…
Abstract It has been shown that the introduction of a few stable crosslinks into the skin protein can greatly increase the resistance of the leather to deterioration by moist heat and perspiration. A method based on stress‐strain measurements has been developed for the determination of the number of crosslinks introdu…
A systematic study of quantum efficiencies and lifetimes has been carried out for the visible fluorescences of Pr3+ in single-crystal LaF3. An analysis of the results as a function of Pr3+ concentration is given in terms of a two-site model in which a Pr3+ ion can either be in an isolated site or in a site where it is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of Carbon Vapor. I. Reactions of Triatomic Carbon with OlefinsP. S. Skell, L. D. Wescott Jr., J.-P. Golstein, and R. R. EngelCite this: J. Am. Chem. Soc. 1965, 87, 13, 2829–2835Publication Date (Print):July 1, 1965Publication History Published online1 May 2002Publi…