Showing papers by "Shivaji University published in 1981"
TL;DR: Magnetisation for both slow cooled and quenched samples of CuxZn1−xFe2O4 as a function of Zn content has shown a maximum at x = 0.6 and a decrease for x0.6 as mentioned in this paper.
23 citations
14 citations
TL;DR: In this article, trin-n-octylamine was used for the extraction and mutual separation of V(V), Nb(V) and Ta(V)) from succinate solution.
14 citations
TL;DR: In this paper, the authors define the Jaumann derivative of a tensor field in relativity by a formal generalization of a stress rate in viscoelasticity, and show that the gravitational potentials are Jaumann transported identically.
Abstract: We define the Jaumann derivative of a tensor field in relativity by a formal generalization of a stress rate in viscoelasticity. A tensor field is said to be Jaumann transported iff its Jaumann derivative vanishes. It is found that the gravitational potentials are Jaumann transported identically. The concept of a “complete rotation tensor” has been introduced to study the Jaumann derivative with respect to a null vector field. This provides a characterization of the integrability of a hypersurface orthogonal congruence. A perfect fluid collapsing by neutrino emission and undergoing Jaumann transport with respect to the neutrino flow is found to be compatible with that of a catastrophic collapse. The circumstances leading to the existence of “ghost neutrinos” are cited. The degeneracy of the Kerr-Newman black hole into the Reissner-Nordstrom black hole is expressed in terms of the Jaumann propagation.
11 citations
TL;DR: In this paper, the effect of the addition of an activator on the luminescence behavior of the phosphors and on the distribution of trapping levels is discussed, in order to obtain the information about the type of kinetics involved in the luminecence process.
6 citations
6 citations
TL;DR: In this paper, the voltage and frequency dependence of brightness is discussed and conclusions are drawn regarding the possible mechanism involved in the process of electroluminescence in CaSO4 phosphors activated with Sm3+ impurity in varying concentrations.
Abstract: CaSO4 phosphors activated with Sm3+ impurity in varying concentrations have been prepared and their electroluminescence systematically studied. The voltage and frequency dependence of brightness is discussed and conclusions are drawn regarding the possible mechanism involved in the process.
4 citations
TL;DR: In this paper, the dependence of photocurrent on the light intensity in CdS:Li films formed by chemical bath deposition technique is studied and the superlinearity observed is explained on the basis of increased lifetime of the photoexcited electron.
Abstract: The dependence of photocurrent on the light intensity in CdS:Li films formed by chemical bath deposition technique is studied. The superlinearity observed is explained on the basis of increased lifetime of the photoexcited electron. The effect of oxygen adsorption in the film surface on the lifetime of the electron is studied.
2 citations
TL;DR: The extracted species is Bi (HOC(6)H(4)COO)(3).3MeO and the separation and determination of bismuth takes only 15 min.
2 citations
TL;DR: B. gymnorrhiza Lamk.
2 citations
TL;DR: In this paper, a method for separation of copper and mercury chelates from binary mixtures of zinc, lead, iron and nickel was proposed. But the method is applicable for analysis of synthetic mixtures and standard samples.
Abstract: Thin-layer chromatographic separation of metal ions has become immensely popular in analytical chemistry in view of its speed, selectivity and applicability at tracer level. Quinoline-2-aldehyde thiosemicarbazone1,2 was found to form yellow coloured chelates with metal ions such as copper, nickel, zinc, mercury, iron and lead at pH 7.5 and extract into chloroform. This, however reduces the sensitivity of the reagent as a chromogenic agent but the chromatographic run of the chelates on a thin layer of silica gel coated on glass plate increases the specificity and selectivity of the reagent. In this article we propose a method for separation of copper and mercury chelates from binary mixtures containing chelates of zinc, lead, iron and nickel. The method is applicable for analysis of synthetic mixtures and standard samples.