Papers

We present a phenomenological analysis of p^±-Ca elastic scattering at 400, 500 and 672 MeV. The analysis is made within the framework of the diffraction model using parameterized phase shift function. Good agreement with the experimental data is achieved, at all energies. Using the parameter values of the p-⁴⁰Ca phase shift function we calculate the radius parameter of the Helm's model density for ⁴⁰Ca
 

The reactions of hexabutylditin with b- diketones and b- ketoesters in the molar ratio of 1:2 were studied in the medium of anhydrous benzene. Complexes of the type R₃Sn-L (where R= ­C₄H₉) have been synthesized. All the reactions were not so facile and tin-tin bond was cleaved in preference to the tin -carbon bond. The resulting tin (IV) complexes of b-diketones and b-ketoesters were isolated in the form of brown yellow solids or semi-solids. They are soluble in common organic solvents. These complexes are supposed to have trigonal bipyramidal geometry.

The effect of non uniformity of bed material on the sediment transport has been studied by various investigators in the past. They .developed the transport rate equation for particular size of sediment in a non uniform bed material, where as the influence of other sizes of sediments has been neglected. The majority of the bed load formulae represent a functional relation between bed load discharge and shear stress. The formulae are characterized by three aspects namely the basic function q_b = A f (t₀-t_c). The characteristic grain-size to be used and the correction applied to bed load equations. The main objectives of this paper are to estimate bed load of monsoon season, to analyze the sediment load during monsoon, using various measured parameters determine q_b, t₀ and t_c and to develop new bed load equation. The bed load equation can be approximated in exponential form as Y = a X ^b. For this purpose bed load, shear stress and critical shear stress are computed. The statistical analysis and curve fitting (by nonlinear square fitter) is carried out by using allometric function of Micro cal Origin 6.1. The modified bed load equation of Duboy's for Tapi river, Monsoon season and for Sarangkheda gauging station is Y =10.27529 X ^1.53544. The proposed bed load equation is tested using five years data of Tapi River. Also, model is tested using data of seven world rivers. The statistical analysis is carried out by computing rmse, inequality ratio and discrepancy ratio. The analysis suggests good agreement between measured and predicted bed load for Tapi river and 5 out of 10 rivers across the globe.
 

The economic lisses on some selected food crops and cash crop due to guinea worm disease (Dracunculiasis) were studied in some endemic communities of Ekiti State, Nigeria, during the period of November 2004 to March 2006. The annual losses due to guinea worm infection on rice, maize, cassava, yam, beans and cocoa production were estimated at N 17,773,500.00 (US$122,575.86). There was a significant difference (P<0.05) between the quantities of crops produced during the period of infection and the quantities produced when there was no infection. There was a drastic fall in crops' production due to inability to treck long distances to their farm as a result of severe incapacitation. The loss in crop output at the farm level translates to increase in vicious circle of poverty and starvation. The great dependence on human labour thus underscores the problem posed by the disease factor in rural lobour supply.
 

The thermal instability of an infinitely homogeneous, Self gravitating, rotating gaseous plasma has been investigated here in the presence of the effects of Generalised ohm's law and viscosity. The dispersion relation has been obtained for parallel propagation and numerical calculation has been performed to obtain the dependence of the growth rate on the various physical effects. It is found that, in the case of parallel by a transverse magnetic field and axis of rotation is taken along the direction of magnetic field, the growth of instability is independent of the magnetic field.

The viscosity of the Cu(NO₃)₂.3H₂O at 10%, 20% and 30% (w/w) of Propan-2-ol +Water mixtures at 30^o, 35^o and 40^o C has been measured. The ions appear to interact and the ion-solvent interaction or structure-breaking effect of the anions changes with the change in Propan-2-ol content.

The unsymmetric tetradentate Schiff-base, derived from condensation of 2-hydroxy-4­methoxyacetophenone, ethylenediamine and 2,4-pentanedione and its VO(IV), Co(II), Ni(II) and Cu(II) complexes have been isolated. Their mixed-ligand analogs are obtained by reacting these M(II) Schiff-base complexes with triphenyl phosphine in the ratio 1:1. The ligand was analyzed pure by microanalysis and characterized by ¹Hnmr spectroscopy. The metal complexes were characterized by conductance, magnetic susceptibility, infrared and electronic spectral measurements. The ligand coordinates using azomethine N and phenolic O atums to give 4-coordinate square-planar/tetrahedral geometry to Ni(II), Cu(II) / Co(II), 5-coordinate, square-pyramidal geometry to VO(IV) Schiff base complexes and a 6-coordinate, octahedral geometry to the mixed-ligand complexes with water coordinating to the 6^th position in some of them, as corroborated by magnetic moments, IR and electronic spectral data. The antibacterial activity of ligand and all metal complexes against Escherichia coli, Shigella flexneri, Salmonella typhi, Staphylococcus aureus and Bacillus subtilis are generally good. The mixed-ligand complexes are mostly more effective than the precursor metal(II) Schiff base complexes, which are in turn more effective than the ligand against the bacteria used with exception of Shigella flexneri.
 

The electrical conductivity (s) and Seebeck Coefficient (S) studies have been reported from 500 K to the melting point (1150 K) the solidified melt of the superionic system Li₂O : V₂O₅ : WO₃. The material is not hygroscopic and does not have a real superionic phase, however, in the temperature range 320 K to 550 K it has high ionic conductivity (s_i = 2.1 × 10^-2 W^-1m^-1 at 330K) with small (0.21 eV) activation energy but relatively large (between 10 to 15 percent) electronic conductivity. Anomaly observed in s and S data is also reflected in molar magnetic susceptibility (c_M) and dielectric constant (K) results.

Some solid and air stable complexes of 4-amino-3-substituted-5-mercapto-1,2,4-triazole with Zirconium (iv) ions have been prepared in acidic, basic and neutral media and characterized using various physico-chemical methods. The ligand is coordinated to metal ion through thione sulphur as indicated from ir spectra. Octahedral geometry has been proposed for the complexes on the basis of normal coordinate analysis, magnetic susceptibility and electronic spectral studies.
 

The aim of present investigation to study the adsorption of organic acids like acetic acid and oxalic acid by the activated charcoal of low cost material like Arachis hypogea L and Vigna sinensis have show that good material for adsorption of acetic acid and oxalic acid langmuir adsorption isotherm valid good for above said low cost material.