Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of axial ligation in metalloporphyrins. I. Imidazole exchange in low-spin ferric porphyrinsGerd N. La Mar and F. Ann WalkerCite this: J. Am. Chem. Soc. 1972, 94, 24, 8607–8608Publication Date (Print):November 1, 1972Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesomorphic properties of some ring-methylated phenyl benzoyloxybenzoatesWilliam R. Young, Ivan Haller, and Dennis C. GreenCite this: J. Org. Chem. 1972, 37, 23, 3707–3712Publication Date (Print):November 1, 1972Publication History Published online1 May 2002Published inissue…
Broad emission4ine profiles from diverse astronomical objects have been interpreted as due to rapid radial outflows of matter. Estimates of characteristic electron densities lead to the conclusion that the effect of electron scattering on the line profiles may be substantial. A Monte Carlo method is employed to treat…
This paper discusses some of the physical processes involved in the flashover of insulators with contaminated surfaces. Past theories of discharge propagation across moist films are reviewed and found to be unsatisfactory in certain respects. To better account for what is observed, it is proposed that under certain co…
Abstract Porous films of poly(hydroxy ethyl methacrylate) have been made by photo‐polymerisation of solutions of the monomer. The permeability of homogeneous films depends on the cross‐link density and the concentration and composition of the polymerisation solvent. A membrane of minimum water permeability, in which t…
The use of various organic compounds in solution and inorganic ions in glasses has been investigated as possible fluorescence Standard Reference Materials. Emphasis was placed on measuring physical and chemical parameters such as stability, reproducibilities of absorbance and fluorescence measurements, relative quantu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of oligothymidylates and nucleoside cyclic phosphates by oxidation-reduction condensationTeruaki Mukaiyama and Mitsunori HashimotoCite this: J. Am. Chem. Soc. 1972, 94, 24, 8528–8532Publication Date (Print):November 1, 1972Publication History Published online1 May…
The calculation of amplitudes and phases of beams of electrons diffracted from thin (≤ 100 nm) crystals of W4Nb26O77 is described. These diffraction data are used to compute 11-beam 00l electron microscope lattice images and the effects of instrument aberrations are considered. Several approximations are compared with…
The collisional deactivation of O(1S) by CO2, O2, N2, and Ar has been investigated as a function of temperature in the range from 200 to 450°K. O(1S) was produced in a pulsed mode by vacuum ultraviolet flash photolysis of CO2. The decay of O(1S) was observed by the 5577 Å emission as a function of time after the produ…
Multiorganometallic compounds were used to prepare high‐purity submicron‐size lead lanthanum zirconate‐titanate (PLZT) powders which can be consolidated at low sintering temperatures to high‐density piezoelectric and electrooptic ceramic bodies. Simultaneous hydrolytic decomposition of lead isoamyloxide, lanthanum iso…
Measurements have been made of electron backscattering in a range of incident beam energy from 0·5 to 10 keV. The variation of backscattering coefficient η with energy and angle of incidence, and the energy spectrum of backscattered electrons at incidence and take-off angles of 45°, have been measured. Results from ca…
HOMSY, CHARLES A. SC.D.; CAIN, THOMAS E. M.D.; KESSLER, FRED B. M.D.; ANDERSON, M. SIDNEY M.D.; KING, JOE W. M.D. Author Information
"Problems of Non-linear Optics." Optica Acta: International Journal of Optics, 19(11), pp. 951–952
The main purpose of this article is to describe the electrical and magnetic properties of extrinsic semiconductors when the concentration of donors varies, particularly for concentrations near that for which a metal-insulator transition takes place. Since the donor centres are distributed at random in space, the combi…
Abstract Glutamate synthase catalyzes the TPNH-dependent conversion of α-ketoglutarate and l-glutamine to glutamate (Tempest, D. W., Meers, J. L., and Brown, C. M. (1970) Biochem. J. 117, 405). Levels of glutamate synthase are similar in Escherichia coli grown on 4 mm or 100 mm NH4Cl, but significantly lower levels of…
An explanation is provided for the phonon conductivity results of trivalent rare-earth-doped gallium and aluminium garnets in the temperature range 2-300 \ifmmode^\circ\else\textdegree\fi{}K. It is found that in GdAlG and GdGaG where the magnetic energy levels are so separated that an electronic transition between the…
A domain model is proposed for nepheline to explain the weak, paired, non-Bragg reflexions. Within the domains the nepheline structure is described in terms of a supercell, consisting of three subcells and stacked in AAA … sequence along c . The domains themselves are in regular sequence corresponding to ABCA … ACBA ……
Integrated intensity measurements of the (100) and (101) x-ray diffraction peaks of hexagonal selenium at pressures up to 52 kbar have permitted a determination of the atomic positions so that the bond distances and chain angle have been obtained at high pressure. The near-neighbor bond distances along the Se chain re…
Abstract Rigid urethane foams were prepared from hydroxymethylated linseed oil and its esters of glycerol, trimethylolpropane and pentaerythritol. These polyols were made by selective hydroformylation with a rhodium‐triphenylphosphine catalyst followed by catalytic hydrogenation with Raney nickel. Although the hydroxy…
Abstract A diffusion equation for the distribution of ionic impurities in a polymer under a dc field has been solved analytically for the conditions that neither injection nor absorption of impurity ions takes place at either electrode and that the ions do not interact. By using the solution of the diffusion equation,…