Methods of calculating crescent length

A number of authors have described the reasons for the shortening of the length of new lunar crescent. McNally devised a mathematical technique to find the shortened length of crescent using his formula for the width. Recently Sultan has also developed a mathematical technique to calculate the length of crescent on the basis of Blackwell contrast threshold. In the present paper a technique for calculating the "observed length" of the new lunar crescent based on the lower limit on the visible width of crescent is developed using q-value criterion of Yallop. This technique is than used to calculate the crescent length for a number of observations reported in literature since the time of Schmidt of Athens. Finally a comparison of the observed crescent lengths is done with the calculated lengths using our technique and the calculated lengths on the basis of the formulas due to Sultan and McNally. The results of this work are consistent with the observed lengths whereas those due to others are generally inconsistent

new variable step size algorthm for solving initial value problems

Polynomials constructed by usual interpolation methods are less accurate as compared to the tools due to Chebyshev. Hence the use of Chebychev's nodes to produce the solution of initial value problems promises more accurate results. In this work a new algorithm is developed using nodes generated by Chebychev's method that are used as points where solution are produced for a number of Linear and Non-Linear Initial Value Problems using classical Runge-Kutta method. The improvement in accuracy is found even when the number of nodes is small, that makes this algorithm better than other valuable step-size methods

Intraction studies of omeprazole with mefloquine, pyrimethamine and sulfadoxine

Mefloquine hydrochloride, pyrimethamine and sulfadoxine as readily tolerated antimalarial drugs that are highly active against both usual and multidrug resistant strains of Plasmodium falciparum. Omeprazole reduce gastric acid secretion, irreversibly by inhibition of H +/- K+ ATPase of the apical membrane of the parietal cell. In order to study the drug interactions of the later with antimalarials, in vitro availability of omeprazole has been studied in presence of mefloquine hydrochloride, pyrimethamine and sulfadoxine. The availability of antimalarial drugs was found to be influenced considerably in presence of omeprazole. The effect of dissolution mediums, simulating various body environments with respect to pH and the influence of temperature on these interactions has been examined in order to elucidate the mechanism of these interactions

Differential mental growth model

The task of optimizing the intellectual potentials of our children and adolescents has required a new urgency that we develop all our human resources to meet the worldwide challenges. From amongst the factors in the cognitive domain that affect learning efficiency, the intelligence is of prime importance. In this paper we are concerned with patterns of intellectual development and have attempted to formulate a differential model, which justifies the mentality of a person at every stage of the age