A similarity solution is presented to study the influence of lateral mass flux and thermal dispersion on non-Darcy natural convection over a vertical flat plate with an exponential type of internal heat generation in a fluid saturated porous medium

A regular two parameter perturbation analysis is presented here to syudy the effect of the uniform transverse magnetic field in the presence of both viscous dissipation and pressure stress

A regular two parameter perturbation analysis is presented here to syudy the effect of the uniform transverse magnetic field in the presence of both viscous dissipation and pressure stress

The interaction of free convection with thermal radiation of the oscillatory flow past a vertical plate is studied

The interaction of free convection with thermal radiation in a laminar boundary flow along a rotating nonisothermal plate subject to a nonuniform gravity fied is studied

Polyo-toluidine. POT. in emeraldine base form EB. has been doped with picric acid PA-doped POT. and dinitrophenol DNP-doped POT.. The conductivities of these doped polymers were found to be 10.52 and 4.82=10y3 S cmy1, respectively. The large difference in conductivity of these polymers is attributed to the more acidic nature of picric acid PA. than dinitrophenol DNP.. The disappearance of the peak at ;650 nm due to EB and the presence of the peak at ;850 nm due to localized polaron in the absorption spectra clearly reveal the dopant-induced protonation of POT. This is also supported from the XPS spectrum showing the disappearance of the peak at ;398.2"0.1 eV due to the imine nitrogen component in EB and the appearance of the peak at ;402.16"0.1 eV owing to the iminium ion `NHq5. of PA-doped POT.The PA-doped POT is thermally stable up to 1408C and completely dedoped at ;3008C. The mass spectra recorded simultaneously with the thermal weight loss showed several fragments due to the decomposition of PA in the temperature region from 1408C to 3008C. The observed high conductivity of PA-doped POT film is attributed to the expanded coil-like conformation, which was proven with the help of the reduced viscosity measurement. The composite of PA-doped POT with insulating acrylonitrile–butadiene–styrene copolymer ABS. was prepared, and the percolation threshold for this composite was ;3 wt.%, which was considerably low compared to that for a typical composite, e.g., ;16 vol.% for poly3-alkylthiophenes. P3ATs.rpoly- styrene PSt. composite. q2000 Elsevier Science S.A. All rights reserved. e

Camphor sulfonic acid (CSA)–doped poly(o-anisidine) (PoAN) has been found to possess the electrical conductivity of 10 S/cm. This value is rather low compared to that of ('200 S/cm) CSA-doped polyaniline, which may arise from a limited transformation of coil-like conformation to an expanded one. Viscosity data and optical absorption spectra provided strong evidence for the existence of coil-like CSA-doped PoAN chains in m-cresol. The shift of IR bands of benzenoid and quinoid rings toward a lower wave number and the appearance of the bands at '1600 and 1173 cm21 (the IR is inactive but becomes active on doping) suggested the protonation of CSA-doped PoAN. The thermogravimetric profile of CSA-doped PoAN showed a five-step decomposition pattern with the thermal stability up to 134 °C. The mass spectra taken simultaneously with the thermogram revealed that dopant CSA is completely eliminated around 360 °C, but the breakdown of polymer chains does not occur very briskly at this temperature. Composites of CSA-doped PoAN with insulating acrylonitrile– butadiene–styrene copolymer (ABS) were fabricated, and it was found that the composites showed a percolation behavior in which the electrical conductivity rose sharply at about 4 weight % of CSA-doped PoAN in the ABS composite. The STM data demonstrated the formation of a continuous path at the percolation threshold. The Poole–Frenkel effect was observed for the conduction scheme in the CSA-doped PoAN/ ABS composite. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 4596–4604, 1999

A sensitive and selective voltammetric methods has been developed for the determination of trace amounts of Mo(VI) ions. This method is based on controlled adsorptive preconcentration of molybdenum species on the hanging mercury drop electrode (HMDE) using mixtures of nitrate and phosphate as supporting electrolytes. The adsorptive stripping response was evaluated with respect to preconcentration time, potential and composition of supporting electrolyte. The method used is cathodic linear sweep stripping voltammetry (CLSSV). The detection limit found was 161078M using 120 s. as accumulation time. The precision of the method is satisfactory with relative standard deviation of 1.4% with ®ve replicates at 161076M Mo(VI). The effect of various surface active substances (SAS) as well as different metal cations and anions in synthetic aqueous solutions has been investigated. Also this method has been applied for the determination of Mo(VI) in environmental samples; e.g., soil, natural water and indoor airborne particulate.

A sensitive and selective voltammetric methods has been developed for the determination of trace amounts of Mo(VI) ions. This method is based on controlled adsorptive preconcentration of molybdenum species on the hanging mercury drop electrode (HMDE) using mixtures of nitrate and phosphate as supporting electrolytes. The adsorptive stripping response was evaluated with respect to preconcentration time, potential and composition of supporting electrolyte. The method used is cathodic linear sweep stripping voltammetry (CLSSV). The detection limit found was 161078M using 120 s. as accumulation time. The precision of the method is satisfactory with relative standard deviation of 1.4% with ®ve replicates at 161076M Mo(VI). The effect of various surface active substances (SAS) as well as different metal cations and anions in synthetic aqueous solutions has been investigated. Also this method has been applied for the determination of Mo(VI) in environmental samples; e.g., soil, natural water and indoor airborne particulate.

A sensitive and selective voltammetric methods has been developed for the determination of trace amounts of Mo(VI) ions. This method is based on controlled adsorptive preconcentration of molybdenum species on the hanging mercury drop electrode (HMDE) using mixtures of nitrate and phosphate as supporting electrolytes. The adsorptive stripping response was evaluated with respect to preconcentration time, potential and composition of supporting electrolyte. The method used is cathodic linear sweep stripping voltammetry (CLSSV). The detection limit found was 161078M using 120 s. as accumulation time. The precision of the method is satisfactory with relative standard deviation of 1.4% with ®ve replicates at 161076M Mo(VI). The effect of various surface active substances (SAS) as well as different metal cations and anions in synthetic aqueous solutions has been investigated. Also this method has been applied for the determination of Mo(VI) in environmental samples; e.g., soil, natural water and indoor airborne particulate.