Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and transport properties of tantalum nickel selenide (Ta2NiSe7) and tantalum platinum selenide (Ta2PtSe7)Steven A. Sunshine and James A. IbersCite this: Inorg. Chem. 1986, 25, 24, 4355–4358Publication Date (Print):November 1, 1986Publication History Pub…
Auxospore formation in Nitzschia recta and N. sigmoidea is associated with allogamous sexual reproduction, in which two vegetative cells pair and function as gametangia. Each gametangium produces two morphologically identical gametes, one of which is active and the other passive (trans-behavioural anisogamy). The game…
Measurements are reported of the electric permittivities, refractive indices and elastic constants for four members of the homologous series of alkyl-cyclohexyl alkyl-fluorobiphenyl ethanes. The results are analysed to give values for the order parameters of the nematogens, and in conjunction with dilute solution meas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKaneric Acid, a New Triterpene from the Leaves of Nerium oleanderSalimuzzaman Siddiqui, Farrukh Hafeez, Sabira Begum, and Bina S. SiddiquiCite this: J. Nat. Prod. 1986, 49, 6, 1086–1090Publication Date (Print):November 1, 1986Publication History Published online1 July 2004Pu…
The electrical conductivity of polycrystalline Y 2 O 3 has been studied as a function of the partial pressure of oxygen (10 –14 to 10 5 Pa) at 900° to 1500°C in atmospheres saturated with water vapor at 12°C or dried with P 2 O 5 . Yttria is a p ‐conductor at high oxygen activities. The p ‐conductivity increases with…
Abstract A series of eighteen‐arm regular star polybutadienes with molecular weights between 9.9 × 10 4 and 1.9 × 10 6 were prepared and characterized. Evidence is presented for the expanded configuration of the large eighteen‐arm stars in a θ solvent. The intrinsic viscosities of the eighteen‐arm stars gave g′ = [η]/…
We report the solution of the excluded volume problem for a pair of biaxial hard molecules; namely, sphero-platelets. As an application of this result we study the isotropic to nematic liquid crystal transition for a fluid composed of these particles in the Onsager limit (length δ breadth or width). We show that the r…
Transparent heat‐reflective films consisting of ITO–Ag–ITO or ZnO–Ag–ZnO were deposited onto soda‐lime glass by dc magnetron sputtering. In particular, the oxide layers were deposited from an electrically conductive oxide target. The transmittance in the visible range of the ITO–Ag–ITO film was more than 80% and the r…
A series expression is developed for the fourth moment of a beamed field incident on a random phase screen or an extended medium. The series has a symmetry that allows its first few terms to generate useful approximations at both low and high spatial frequency. The parabolic wave equation, the Markov approximation, an…
Abstract Clinoptilolite, Ca x (Na,K) 6‐2 x {Al 6 Si 30 O 72 }·24H 2 O, frequently has been recognized in Cenozoic volcanogenic sedimentary rocks; however, its occurrence in soils has received little attention. In the course of this study, clinoptilolite was identified in calcareous soils derived from volcanic‐rich sed…
A theoretical analysis of the oscillating voltage at twice the Larmor frequency (2ω 0 ), due to quadrupolar polarization of 14 N nuclei, predicts a signal at least ten orders of magnitude smaller than the magnetic-induction signal produced by the same sample. However, nonsecular parts of the quadrupolar interaction ar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of an iron(III) porphyrin N-oxideJohn T. Groves and Yoshihito. WatanabeCite this: J. Am. Chem. Soc. 1986, 108, 24, 7836–7837Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published inissue 1 November 19…
A comparison of freshwater and marine Gomphonema species has shown that the ecological separation is accompanied by a morphological one. They have only been assigned to the same genus because they all have heteropolar, cuneate cells, which are attached to the substratum by a mucilage pad or stalk. The marine taxa can…
Abstract 13 C‐NMR spectra of trityl cellulose (Tr‐Cell), tosyl cellulose (Ts‐Cell), cellulose S‐methyl xanthate (Cell‐M‐Xan), and cellulose formate (CF) in dimethylsulfoxide‐ d 6 were analyzed at 50.4 MHz. It was found that the distribution of substituents in the anhydroglucose units of these cellulose derivatives can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR of phosphorus-31 heteroatoms in paramagnetic 1-electron heteropoly blues. Rates of intra- and intercomplex electron transfers. Factors affecting line widthsMariusz. Kozik, Charles F. Hammer, and Louis C. W. BakerCite this: J. Am. Chem. Soc. 1986, 108, 24, 7627–7630Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhotoresponsive polymers. Reversible bending of rod-shaped acrylamide gels in an electric fieldMasahiro IrieCite this: Macromolecules 1986, 19, 11, 2890–2892Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published inissue 1 November 1986ht…
The classical polarizability theory of optical activity in crystals is elaborated and a method of calculating rotatory power from crystal structure data is described. By varying the polarizabilities of the atoms within reasonable limits, optical rotatory powers are computed for crystals of α-quartz, AlPO4, cinnabar, B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrialkoxynitridomolybdenum compounds: (RO)3Mo.ident.N. Preparation, structures (R = tert-Bu and iso-Pr), and comparisons with a tungsten analog (R = tert-Bu)Dominic M. T. Chan, Malcolm H. Chisholm, Kirsten Folting, John C. Huffman, and Nancy S. MarchantCite this: Inorg. Chem…
An earlier procedure for calculating homogenization during the solidification of binary alloys is extended to include more realistic assumptions for dendrite arm coarsening kinetics and the partition coefficient. Dendrite coarsening is shown to follow the usual exponential function which differs from that relating fin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of structural disorder on organic superconductors: a neutron diffraction body of "high-Tc" .beta.*-(bis(ethylenedithio)tetrathiafulvalene)2 triiodide at 4.5 K and 1.5 kbarArthur J. Schultz, Hau H. Wang, Jack M. Williams, and Alain. FilholCite this: J. Am. Chem. Soc. 1…