Preparation and characterization of some organotin(IV) complexes of benzilmonoxime thiosemicarbazone as ligand

419-422Some di- and triorganotin(IV) complexes of benzil-α-monoxime thiosemicarbazone have been synthesized by the reactions of corresponding di- and triorganotin(IV) chlorides with the sodium salt of BMTH2 in desired molar ratios. All the compounds have been characterized by elemental analyses and spectral (IR,1H, 13C and 119Sn NMR) studies

Synthesis and characterization of some new tin(IV) derivatives of NO and N₂O₂ chelating Schiff bases

1295-1301Tin(IV) complexes of Schiff’s bases e.g. N,N'-hydrazine bis(salicylideneimine), N,N'-o-phenylenebis(salicylideneimine) and benzoin-α-oxime have been synthesized by the reactions of stannic chloride (SnCl4) with the sodium salts of the corresponding ligands in different stoichiometric ratios. All the compounds are characterized by elemental analyses and spectral (IR, 1H, 13C and 119Sn NMR) studies

The Effects of MHD Flow and Heat Transfer for the UCM Fluid over a Stretching Surface in Presence of Thermal Radiation

An analysis is performed to investigate the effect of MHD and thermal radiation on the two-dimensional steady flow of an incompressible, upper-convected Maxwells (UCM) fluid in presence of external magnetic field. The governing system of partial differential equations are transformed into a system of coupled nonlinear ordinary differential equations and is solved numerically by efficient shooting technique. Velocity and temperature fields have been computed and shown graphically for various values of physical parameters. For a Maxwell fluid, a thinning of the boundary layer and a drop in wall skin friction coefficient is predicted to occur for the higher elastic number which agrees with the results of Hayat et al. 2007 and Sadeghy et al. 2006. The objective of the present work is to investigate the effect of elastic parameter β, magnetic parameter Mn, Eckert number Ec, Radiation parameter N, and Prandtl number Pr on flow and heat transfer charecteristics

Radiative heat transfer on the peristaltic flow of an electrically conducting nanofluid through wavy walls of a tapered channel

Present analysis deals with the characteristics of radiative heat on the peristaltic flow of nanofluid through wavy walls of a tapered channel. Peristaltic flows within the pumping process arise in the region having lower to higher pressure region. Assumption of velocity slip along with the convective boundary condition energizes the thermal system as well as the flow phenomena. However, the combined effect of Brownian motion and thermophorsis due to the cross-diffusion effect affects the flow properties. One of the significant applications of the flow is that the blood pumping in the human body. It acts as a vehicle through the liquid that past through the wavy channels walls contacting liquids expands in its length due to the dynamical rush. However, solution of the transformed governing flow phenomena is obtained by employing approximate analytical technique known as Variation Parameter Method (VPM). The characteristics of the parameters involved in the system are presented via graphs. Present outcome warrants that, the significance of magnetic strength and flow through the permeable medium may favours to enhance the pumping procedure as the pressure gradient lower down in the non-Darcy medium found to be one of the important observations. Further, significant enhancement in the fluid temperature and concentration profile is exhibited due to the consideration of the convective conditions i.e. the augmentation in the thermal and solutalBiot numbers respectively

Additional information on the threatened Cryptocoryne cognata Schott (Araceae): A need for reassessment of the IUCN Red List status

Cryptocoryne cognata Schott is a threatened species distributed in the entire Konkan stretch covering Goa, Karnataka and Maharashtra. It was rediscovered in 1990 after not being documented for one and half centuries. The data concerning its morphology, distribution and ecological preferences are presented in this paper in order to contribute to the Global Strategy for Plant Conservation (GSPC) goals and to assist taxonomists in assessing and protecting this species from extinction in future.   </div