Kinetics and mechanism of sulphurous acid oxidation by hexachloroiridate(IV) in hydrochloric acid

Summary The reaction between sulphurous acid and hexachloroiridate(IV) appears to take place through the formation of an intermediate complex followed by decomposition to give oxidation products. The rate is retarded as the hydrogen ion concentration increases. Thermodynamic parameters associated with the equilibrium step as well as with the slowest step have been calculated. The probable mechanism of the reaction is discussed.     

The method of successive updated iterated defect correction and its application to second kind volterra integral equations

We present a new method for the numerical solution of Volterra integral equations of the second kind. This method is based on the technique of Iterated Defect Correction. Numerical examples are given to demonstrate the power of our method.Based on his research at Indian Institute of Technology, Kanpur, India.     

Ligand effect in epoxidatidns by hydroperoxides using molybdenum catalyst: epox idation of 3-carene

Epoxidation of (+)-3-carene with pinane hydroperoxide in presence of various transition metal catalysts, has been evaluated as a preparative method for (+)-3α,4α-epoxycarane. Catalysts based on Mo(VI) were found to be most suitable. A distinct ligand effect was noted for this oxidation and a plausible rationale is put forward.     

Barriers and dispersal surfaces in minimum-time interception

Dispersal points and points on the barrier are located for a class of pursuit-evasion and interception problems. These points are determined by constructing cross sections of the isochrones, and hence by obtaining the barrier, dispersal, and control-level surfaces. The method is illustrated through examples from minimum-time interception of a target moving in a straight line in a horizontal plane.The authors are indebted to F. Neuman, M. Sidar, J. Shinar, H. Erzberger, and G. Leitmann for their comments. The first author wishes to acknowledge the financial support of the National Research Council.     

XANES and EXAFS of copper compounds: Studies of copper carboxylates with metal-metal bonds and of the complex formed by Pseudomonas aeruginosa

X-ray absorpion near edge structure (xanes) of copper compounds with copper in 1⁺, 2⁺ and 3⁺ states has been studied. Extended x-ray absorption fine structure (exafs) has been employed to determine bond distances and coordination numbers in several model copper compounds. Employing bothxanes andexafs, the structure of the copper complex formed by the micro-organismPseudomonas aeruginosa has been shown to be square-planar with the Cu-O distance close to that in cupric glucuronates and cupric acetylacetonate.exafs has been shown to be useful for studying metal-metal bonds in copper carboxylates. Communication No. 228 from the Solid State and Structural Chemistry Unit     

On the direct determination of constrained pure state one-electron density matrices: II. A modified algorithm and its applications

An algorithm recently proposed by us for the direct determination of pure state one-electron density matrices (P) under externally imposed constraints has been remodelled. The modified algorithm is applied to the construction of ground state potential energy curve of lithium hydride molecule usingknown values of dipole moments of LiH at various internuclear distances as theexternal constraint. The equilibrium internuclear distances (R _c) is seen to be unaffected by the constraint, but the force constant improves remarkably. The relevant features of the constrained density vis-a-vis those of the unconstrained one are analyzed revealing some of the improved features of the constrained density.     

A Multi-Drug Pharmacokinectic Optimal Control Approach in Cancer Chemotherapy

Journal of Optimization Theory and Applications - The mathematical study of the growth and treatment of cancer has been of great interest to researchers in the recent past as that can help clinical...