Materials Literature
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Abstract— A kinetic investigation was performed on the photooxidation of methionine sensitized by various porphyrins at different oxygen concentrations. The rate of photooxidation was found to be strongly dependent on the nature of the sensitizer. In the case of hematoporphyrin, chelation of Mg 2+ and Zn 2+ and especi…
The idea of public geographies, inspired by Burawoy's call for public sociologies, places an emphasis on the co-construction of research data, accessible writing and the use of non-traditional media. As yet, however, the methodological implications of public geographies have not been explored. Hence this project seeks…
Monoclinic TaSe 3 was found to be superconducting below 2.1 K. The effect of magnetic field on the transition curve is very anisotropic. One-dimensional behavior is expected.
Measurements of the secondary electron yields delta and delta T on the incident and the opposite surfaces respectively of transparent Al and Au films are reported for the normal incidence of 10-100 keV electrons, using an apparatus with accurate separation of secondary, backscattered and transmitted electrons. Results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal clusters in catalysis. 10. A new Fischer-Tropsch synthesisG. C. Demitras and E. L. MuettertiesCite this: J. Am. Chem. Soc. 1977, 99, 8, 2796–2797Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 April 1977https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe spectrochemical properties of tetragonal complexes of high spin nickel(II) containing macrocyclic ligandsLudmila Y. Martin, C. Robert Sperati, and Daryle H. BuschCite this: J. Am. Chem. Soc. 1977, 99, 9, 2968–2981Publication Date (Print):April 1, 1977Publication History…
The surfaces of the normal paraffins (C3–C8) and cyclohexane have been studied using low-energy electron diffraction (LEED). The samples were prepared by vapor deposition on the (111) face of a platinum single crystal in ultrahigh vacuum, and were studied both as thick films and as adsorbed monolayers. These molecules…
Simplified equations are presented for the elastic properties of randomly oriented short fiber-glass composites. The suggested equations for the Young's modulus, the shear modulus and the Poisson ratio are given in terms of the fiber-glass content and the Young's moduli of the constit uents. The equations are applicab…
Gratings with variable periods (chirped gratings) have been fabricated by recording the interference pattern of a collimated laser beam with a converging beam generated by a cylindrical lens. An analysis is presented for the behavior of the chirped gratings as a function of wavelength, the angle between the illuminati…
The application of the Mössbauer, NMR and neutron spectroscopies to the study of the hexagonal ferrites allows to give more insight into the correlations between the cation distribution, the sublattice magnetization and spin configuration. In the present paper a comparative discussion of the data obtained on M, Y, W a…
In the basic spinel NiFe2O4, ions of larger and larger ionic radius, Zn2+ and Cd2+, have been introduced with higher and higher concentrations. The corresponding materials of composition Ni1-xZnxFe2O4 and Ni1-xCdxFe2O4 have been prepared by using a special technologic process. The lattice constant increases linearly w…
The solution is given for the problem of screw dislocation in non-local elasticity. The shear stress and the elastic energy are calculated. Interestingly, none of the classical singularities (for the stress and energy) exist in the non-local solutions. Estimates are provided for the critical shear stress which will pr…
The plastic deformation behaviour of a series of glassy aromatic polyimides, derivatives of resorcinol, hydroquinone, oxydiphenyl, and pyromellitic acid, have been investigated between room temperature and a temperature 20 K below their respective glass transition temperature. The results are analysed by means of a th…
A study was made on the adsorption of phenolic acids, which are known to be plant growth inhibitors, by kaolinite, illite, vermiculite, noncrystalline hydroxy-Al and -Fe compounds, and four Taiwan soils. The adsorption sequence of phenolic acids by kaolinite, illite, and vermiculite followed the general decreasing ord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the molybdenum and vanadium catalyzed epoxidation of olefins by alkyl hydroperoxidesA. O. Chong and K. B. SharplessCite this: J. Org. Chem. 1977, 42, 9, 1587–1590Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissu…
The near-surface nucleation and crystallization behavior of Ag+ ion-implanted lithia-alumina-silica glasses has been studied. For room-temperature Ag implants, crystallization of the glass ceramic phase was prevented by dissolution of Ag precipitates and migration of Ag atoms at temperatures below that necessary for f…
Electron dense markers of a size suitable for transmission electron microscopy and scanning electron microscopy have been prepared with gold granules labeled with a monolayer of specific macromolecules. The optimum conditions for preparing the markers have been ascertained. The method is simple, rapid and seems to be…
Abstract Nickel complexes (NiCl2 (2,2′-bipyridine) and NiBr2(triphenylphosphine)2) catalyze polycondensation of di- and polyhalogenated aromatic compounds including p-dibromobenzene, p-dichlorobenzene, m-dichlorobenzene, bis (4-bromophenyl)ether, p-chlorobenzyl chloride and 1,3,5-trichlorobenzene by dehalogenation wit…
<p>This study investigated possible similarities between the ability to identify pitches and the ability to identify loudnesses. Systematic training of musically naive subjects indicated that frequency identification performance improves at about the same rate as intensity identification performance. Examination…
Solubility isothe nns of hydroxyapatite, Ca5(PO.h OH (OHAp) , pre pa red by titrating a boiling aqueous suspe nsion of Ca(O HJ, with 0 .5 M H3PO., we re detennined in the te rnary system Ca(OHJ,-H3PO.-H20 at 5, 15, 25, a nd 3 7 C in the pH ra nge 3 .7-6. 7 by equilibration with dilute H3PO. solutio ns. The solubility…