Materials Literature
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Many of the significant reactions of unsaturated hydrocarbons (hydrogenation, isomerization, carbonylation, oxidation, polymerization) are catalyzed heterogeneously by metals in or near Group VIII or homogeneously by salts and complexes of these elements. Those reactions effected in both systems are discussed in terms…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclotetramerization of 2-dimethylamino-4-tert-butylpyrrole. Tetra-tert-butylporphyrinsB. J. Whitlock, H. W. Whitlock, and H. AllesCite this: J. Am. Chem. Soc. 1974, 96, 12, 3959–3965Publication Date (Print):June 1, 1974Publication History Published online1 May 2002Published…
Secondary recrystallization was observed in 0.25mm thick dysprosium sheet having final cold reductions in the range of 40-60% prior to annealing at 1150°C in a dry helium atmosphere. X-ray and etch-pit studies revealed a predominant (0001)[10\bar{1}0] secondary recrystallized texture. Magnetization curves at 4.2 K and…
Single crystals of Ca2BO3Cl grown from CaCl2 flux near 800 °C have space group P21/c and unit-cell constants a = 3.9484 (4), b = 8.692 (2), c = 12.402 (2) A, β = 100.27 (1)°.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and magnetism of a tetranuclear basic quinoline adduct of copper(II) trifluoroacetateR. G. Little, James A. Moreland, D. B. W. Yawney, and Robert J. DoedensCite this: J. Am. Chem. Soc. 1974, 96, 12, 3834–3842Publication Date (Print):June 1, 1974Public…
Debye rings of several samples of HgS were taken at various temperatures between 20° and 370°C. Impure samples transformed from α-HgS (trigonal) to β-HgS (cubic) at about 300°C in heating and from β to α at about 200°C in cooling. The transformation temperature in heating or cooling shifts upwards for samples of highe…
Taking polycrystalline cadmium as an example and by utilizing the predicted temperature or strain rate-dependence of the (Hall-Petch) stress-grain size parameters, a reasonably quantitative explanation is given for the grain size dependence of apparent activation volume measurements. The explanation involves the theor…
Mutants deficient in both glucose-6-phosphate dehydrogenase and phosphoglucose isomerase lysed 4 to 5 h after growth in nutrient medium containing glucose, or after prolonged incubation if the medium contained galactose. The lysis could be prevented by the addition of any other rapidly metabolizable carbon source such…
A bstract Assessment of the insulation (clo) value and evaporative impedance ( i m /clo) value of a clothing system can provide an accurate estimate of the relative advantages of one garment or fabric over another with respect to the thermal protection and/or strain associated with wearing the clothing. There are effe…
Optical-absorption spectra are presented from 3.8 to 7.4 eV of the coloration produced in crystalline MgO by bombardment with 3-MeV ${\mathrm{Ne}}^{+}$ convering a fluence range from ${10}^{14}$ to ${10}^{17}$ ions ${\mathrm{cm}}^{\ensuremath{-}2}$. Dose dependence of absorption at 5.0, 5.8, and 7.0 eV and of the inte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized crystal absorption spectra and crystal structure for potassium tetrabromoplatinate(II)Roy F. Kroening, Rhonda M. Rush, Don S. Martin, and Jon C. ClardyCite this: Inorg. Chem. 1974, 13, 6, 1366–1373Publication Date (Print):June 1, 1974Publication History Published o…
The synthesis of polyphenylquinoxalines (PPQ) is discussed in detail. Solutions of PPQ at 20% solids content from stoichiometric quantities of pure reactants are generally metastable, increasing in viscosity and, in some cases, gelling. This can be alleviated without any appreciable detrimental effect upon the polymer…
The Fraunhofer diffraction patterns of the triangle, trapezoid, and hexagon are calculated and displayed in moiré plots. The diffraction pattern of the general polygonal aperture with a finite number of vertices can be calculated in terms of elementary functions.
The glass transition temperatures of linear and four- and six-branched regular star polystyrenes are measured by penetration, differential scanning calorimetry, and a density gradient technique. The results of the three methods show that the glass transition temperature depends on the concentration of chain ends in th…
Measurements are presented of the dielectric constants of some p,p′-n-alyl and n-alkoxy substituted azobenzenes and azoxybenzenes in the nematic and in the isotropic phase. Starting from the dipole-less, p,p′,di-n-alkyl-azobenzenes, a systematic interpretation is given of the influence of the molecular structure on th…
A Philips E.M. 300 electron microscope operating in the dark field high resolution mode has been used to study the size dependence of the melting points of individual particles of indium. The straight line graph, obtained from a simple thermodynamic treatment of the results, shows that the surface tension at the inter…
A new method which eliminates some disadvantages of the Epstein method has been developed for the rapid measurement of core losses and permeabilities at 50 or 60 Hz of single-sheet specimens. It is shown that the instrument has the following performance: 1) good correlation of the measured value with Epstein testing,…
Abstract The luminescence spectra of ZnO platelets at 1.9 K have been investigated under 3371 Å Insor excitation from 5 to 500 kW/cm 2 . New details in the P‐band luminescence (exciton‐exciton scattering) reveal the separation between A and B excitons in ZnO and the stimulated emission in this band is found to be stro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarch-Filled Polyvinyl Chloride Plastics-Preparation and EvaluationRichard P. Westhoff, Felix H. Otey, Charles L. Mehltretter, and Charles R. RussellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 2, 123–125Publication Date (Print):June 1, 1974Publication History Publi…
The electrical conductivity and ion/electron transference numbers in Al 3 O 3 were determined in a sample configuration designed to eliminate influences of surface and gas‐phase conduction on the bulk behavior. With decreasing O 2 partial pressure over single‐crystal Al 2 O 3 at 1000° to 1650°C, the conductivity decre…