Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermolecular exchange in methylphosphonic difluoride-amine complexes via a fluorine bridged dimerR. L. Wintermyer, L. L. Szafraniec, and H. R. BradfordCite this: J. Org. Chem. 1972, 37, 14, 2355–2357Publication Date (Print):July 1, 1972Publication History Published online1…
A single crystal structure refinement of Cr 3 P shows that the compound crystallizes with the Fe 3 P type structure. Atomic positional parameters and interatomic distances are reported and discussed. An examination by X-ray diffraction methods shows that Zr 3 P can dissolve hydrogen in solid solution. Some evidence is…
By the use of the resonance method, the electrostrictive coefficient Q 33 and the elastic compliance coefficients s 33 D , s 33 E have been determined from -70°C to 50°C. In the ferroelectric phase, Q 33 was obtained from the piezoelectric coefficient and spontaneous polarization, while in the paraelectric phase it wa…
The problems involved in making a mechanical analysis of bending deformations in textile fabrics are discussed. It is suggested that progress can be made by making simplifying assumptions concerning the geometry of fabric structure and deformation and using energy considerations to calculate forces and moments. Certai…
A method for calculating the geometric factor of cylindrical plate electrostatic energy analyzers with various detector geometries is described. The effects of the fringe field are estimated. For a special simple case an exact geometric factor is calculated, enabling an estimate to be made of the inaccuracies of the a…
The free sesquioxides in the soil may exist both in the crystalline and amorphous forms. The amount and the relative distribution of these forms within the soil profile can have a most important bearing on the physicochemical properties of the soil, on the interpretation of soil genesis and on studies connected with I…
The (0001) surface of α-Al2O3 has been studied by low-energy electron scattering. Interesting features in the LEED pattern, the energy loss spectrum and the LEED intensity profile, have been observed. The results are discussed in terms of the characteristics of the corundum structure.
Abstract The thermal transformation of the gelatinous aluminium hydroxides (amorphous and pseudoboehmite) prepared from aqueous aluminium chloride solution on addition of sodium hydroxide at various pH, have been studied by X‐ray diffraction, infrared spectra and thermal analyses. As a result, it is concluded that the…
Abstract The unstable colorless form (A′) of the reverse photochromic spiran (SP-3) (1,3,3-trimethyl-5-methoxyspiro[indoline-2,2′-benzopyran]-8′-carboxylic acid) was obtained in a stable state by vacuum evaporation (10−5 Torr) on a KBr substrate. It was confirmed by IR spectral analysis that reverse photochromism occu…
Abstract The heat capacities of 8 kinds of stable and meta-stable crystalline phases including the glassy crystal of cycloheptanol were measured at temperatures from 13 to 300 K. The crystalline phases have been named crystals I, II, II′, III, III′, III″, Iβ, and glassy crystal. Transition temperatures between crystal…
Edgar A. Tonna, Ph.D., Nina M. Lampen, B.S.; Electron Microscopy of Aging Skeletal Cells. I. Centrioles and Solitary Cilia1, Journal of Gerontology, Volume
Measurements have been made of the magnetic properties of rare earth-transition metal compounds having the Fe 3 C structure. The results obtained using a pulsed field magnetometer are appreciably different from those observed previously in static fields by other workers. It has proved difficult to decide from these re…
In the K 2 S/Sb 2 S 3 -System the compound K 2 Sb 4 S 7 has been prepared and its structure determined. In this structure there are two differently coordinated Sb-atoms: the Sb I -atoms in the vertices of flat SbS 3 -pyramides have the CN 3 to sulfur, the Sb II -atoms are ψ-trigonal-bipyramidal coordinated with one fr…
Electronic stopping powers for a hydrogen beam at energies between 25 and 250 keV are measured in the metals Ni, Cu, Ag, Sn, and Au using the straightforward technique of measuring the energy loss of a beam traversing a thin target foil. The metal foils, fabricated specifically for this purpose, are self-supported and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT3,3,4,4-Tetramethyl-1,2-diazetine 1,2-dioxide, a useful low-energy triplet quencherEdwin F. Ullman and Prithipal SinghCite this: J. Am. Chem. Soc. 1972, 94, 14, 5077–5078Publication Date (Print):July 1, 1972Publication History Published online1 May 2002Published inissue 1 Ju…
Abstract Superoxide radical, generated by ultrasonication of buffered aerated aqueous solutions, was detected by its ability to cause the reduction of ferricytochrome c. The rate of reduction of cytochrome c was enhanced by scavengers of hydroxyl radicals, such as formate, and was inhibited by the biological scavenger…
The notion of quasi dislocations is used to describe the sources of internal stresses in a nonuniformly magnetized body which is otherwise perfect. Energy densities and interaction energies with other defects are derived in the same formalism. The distortion tensor (strains and rotations) is calculated in the case of…
The reaction of a modulated beam of molecular oxygen with the prism plane of pyrolytic graphite was investigated. Diffusional processes in the bulk dominated the response of the emission rates of CO and CO2. The phase lags of these products relative to the impinging reactant beam indicated that the surface reactions w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic chalcogen complexes. XXV. Structural and magnetic studies of Co3(h5-C5H5)3(CO)(S), Co3(h5-C5H5)3S2, and the oxidized monocation, [Co3(h5-C5H5)3S2]+. Sensitivity of the geometry of a triangular metal cluster system to antibonding electronsP. Douglas Frisch and…
Abstract The results of kinetic investigations with pure chorismate mutase-prephenate dehydratase from Escherichia coli K-12 were as follows: a pH optimum of 7.3 for the mutase activity, a Km of 0.045 mm for chorismate, and a Km of 1.0 mm for prephenate. l-Phenylalanine inhibited both the mutase and the dehydratase ac…