Materials Literature
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Highly conducting and transparent thin films of undoped tin oxide (SnO 2 ) are prepared on unheated substrates (≦90°C) by rf magnetron sputtering under an applied external dc magnetic field. The lowest resistivity obtained is 1.9×10 -3 Ωcm. The SnO 2 films with a sheet resistance below 200 Ω/ s q and an average visibl…
Several chalcone derivatives exhibiting second harmonic generation up to 5 times that of urea under IR-excitation have been synthesized by varying the substituents on both phenyl-rings.
We present the first calculations, by computer simulation, of the Frank elastic constants of a liquid crystal composed of freely rotating and translating molecules. Extensive calculations are performed for hard prolate ellipsoids at a single density, and for hard spherocylinders at three densities. For ellipsoids, the…
Typical DC characteristics and X-band noise parameters are presented and qualitatively correlated wherever possible with other technological or experimental data. While certain general trends can be identified, further work is needed to explain a number of observed phenomena. A design technique for cryogenically coole…
A survey is presented of recent developments in NO{sub x} removal processes. Particular attention is paid to selective catalytic reduction, with emphasis being placed on catalysts for the reduction of NO{sub x} from stationary sources. Chapters are included on: sources of nitrogen oxides and emission standards, contro…
Bis(trifluoroacetylacetonato)copper(II), Cu(tfac),, reacts with the nitronyl nitroxide radical 2,4,4,5,5-pentamethyl-4,5-dihydro- 1 H-imidazolyl-I-oxy 3-oxide, NITMe, to yield a square-pyramidal adduct of formula C~(tfac)~.N1TMeT. he X-ray crystal structure shows that it crystallizes in the space group Pi, with a = 10…
(1988). The Burning Behaviour of Textiles and its Assessment by Oxygen-index Methods. Textile Progress: Vol. 18, No. 1-3, pp. 1-186.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAngle dependence of the properties of the [Fe2X]4+ bridge unit (X = O, S): structures, antiferromagnetic coupling, and properties in solutionR. N. Mukherjee, T. D. P. Stack, and R. H. HolmCite this: J. Am. Chem. Soc. 1988, 110, 6, 1850–1861Publication Date (Print):March 1, 1…
Abstract Polypyrrole powder and films were chemically synthesized by the reaction of AgNO 3 , FeCl 3 , Fe(NO 3 ) 3 , Cu(NO 3 ) 2 , or Cu(NO 3 ) 2 ‐AlCl 3 with pyrrole in an aqueous solution or a water—toluene two‐phase system. Products were characterized by elemental analysis, IR, scanning electron microscopy with ene…
The rhombohedral phase (R-phase) transition and associated deformation behaviour in Ti-50·5 at.% Ni single crystals have been investigated systematically by tensile testing age-treated specimens in various orientations over a wide temperature range. Shape-memory effects and pseudoelasticity were observed in the first…
Aharonov and Anandan have recently reformulated and generalized Berry’s phase by showing that a quantum system which evolves through a circuit C in projective Hilbert space acquires a geometrical phase β(C) related to the topology of the space and the geometry of the circuit. We present NMR interferometry experiments…
Abstract Recently it has become apparent that for quantitative studies the I (ω) Raman spectrum measured directly from the spectrometer must be corrected for temperature and frequency factors to give a reduced Raman spectrum, R (ω), which is directly proportional to the intrinsic molar scattering factor. Although gene…
The well known, extremely reactive [18]annulene 1 and the hypothetical isomer 2 should be capable of being stabilized by CH2- and CHCH-groups as internal and external bridges, respectively. The corresponding hydrocarbons, 3 and 4, are still unknown, although they are of great interest as links between the non-natural…
SUMMARY The reaction of cadmium with calcite was studied with 10 −6 –10 −2 M Cd 2+ using 4g CaCO 3 and 50 ml solution. The calcite‐water suspension was equilibrated for 2 d before adding Cd(NO 3 ) 2 . The CaCO 3 surface has a high affinity for Cd and at < 1 μmol g −1 a linear adsorption isotherm (C‐type) describes…
A survey of work at the Kernforschungszentrum Karlsruhe is presented on the chemical state of selected fission products that are relevant in the fuel cycle of light water reactor (LWR) and fast breeder reactor fuels. The influence of fuel type and irradiation progress on the composition of the Mo-Tc-Ru-Rh-Pd fission p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA class of conducting polymers having nonconjugated backbonesM. ThakurCite this: Macromolecules 1988, 21, 3, 661–664Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://pubs.acs.org/doi/10.1021/ma00181a021h…
Metallic electromigration can be defined as the movement of metallic material, usually through or across a nonmetallic medium, under the influence of an electric field. As such, it has assumed increasing importance in the performance and reliability of packaging systems that incorporate electric contacts. The characte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOleanderol, a New Pentacyclic Triterpene from the Leaves of Nerium oleanderSalimuzzaman Siddiqui, Farrukh Hafeez, Sabira Begum, and Bina S. SiddiquiCite this: J. Nat. Prod. 1988, 51, 2, 229–233Publication Date (Print):March 1, 1988Publication History Published online1 July 2…
Abstract The effect of selected low molecular weight organic acids on release of K from K‐bearing minerals was investigated by reacting biotite, muscovite, microcline and orthoclase (20–50 µm) with 0.01 mol L −1 oxalic and citric acids or water for 1 h to 30 d. The rates of the K release varied with the nature of orga…
Measurements of the temperature dependence of the coercive field, of the magnetic viscosity, and of the angular dependence of the coercive field are reported for ferrite and rare-earth-transition-metal sintered magnets. A satisfactory explanation for the observed properties is obtained in a simple model, considering t…