Vol. 2 & Issue 1 ; Section C : Physical Sciences

Date : Nov.2011 to Jan.2012

 

Numerical Rate of Convergence of Bisection Method

R. B. Srivastava and Shalini Srivastava

  • Abstract

    A computer program in C++ language has been developed to calculate cube roots of numbers from 1 to 25 in interval [1, 3] using bisection method. Rate of convergence has been found out in each calculation. Lowest rate of convergence has been observed in the evaluation of cube root of 18 and highest in the evaluation of cube root of 9. Average rate of convergence of bisection method has been found to be 2.488206405

Mechanoluminescence of Eu2+ doped Sr5 (PO4)3Cl p

A.K.Sahu ,P.S.Chowdhury ,V.Nayar and S.J.Dhoble 

  • Abstract

    Synthesis of  Sr5 (PO4)3Cl phosphor by using the solid state diffusion technique. The ML intensity of  Sr5 (PO4)3Cl:Eu2+ phosphor increases linearly with time and then it attains a maximum value Im at a nanosecond of time tm . After tm the ML intensity increases exponentially at a fast rate and then it decreases exponentially at a slow rate. The ML intensity increases with increasing concentration of Eu, attains an optimum value f

A CFD based study of turbulence energy dissipation in mixing ve

Kumar Verma and Amit Keshav

  • Abstract

    The distribution of rate of energy dissipation in the stirred vessel, stirred by a Rushton Impeller has been obtained from CFD predictions of the flow employing moving reference frame (MRF) approach and RANS based turbulence model (standard k- ε). In a stirred tank, flow around the rotating impeller blades interacts with the stationary baffles and generates a complex, three-dimensional, recirculating turbulent flow. The CFD simulations are performed in a 3D domain using commercial code FLUENT. The simulation is conducted to get normalized radial pumping capacity (NRPC) profile, turbulent kinetic energy and normalized turbulent dissipation rate. The numerical predictions are found to be within - 8.5% of error when compared with the experimental data. The present CFD result also indicates that a substantial amount of energy might be dissipated in the bulk of the flow and near the wall of baffles

Comparison of Numerical Rate of Convergence of Bisection, Newto

R. B. Srivastava, Shalini Srivastava

  • Abstract

    A computer program in C language has been developed to calculate cube roots of numbers from 1 to 25 using bisection, Newton-Raphson’s and secant methods. Numerical rate of convergence has been found out in each calculation. Average numerical rate of convergence of bisection, Newton-Raphson and secant methods have been found to be 2.488206405000, 19.105997600000 and 26.547447346241 respectively. It indicates that the numerical rate of convergence of bisection, Newton-Raphson and secant methods is in the order bisection method < Newton- Raphson method < secant Method. These results arte in accordance of theoretical results

Treatment of rice mill effluent for pollution control by Electrocoagulation

Pooja Vaishnav Shrivastava and Anupam Bala Soni

  • Abstract

    Rice milling is the process of removing the husk and part of the bran from paddy in order to produce edible rice. Parboiled rice production requires a larger amount of water. This water, if not properly treated, could give rise to water pollution. The limitations in the physic-chemical methods and biological methods make Electrocoagulation the favourable alternatives for the removal of pollutants from the industrial effluents. The maximum removal of oxygen Demand), Oil and Greece, Turbidity and TSS (total suspended solids) has been considered in the present investigation. The process variables are pH, current density and inter space between electrodes. As a part of study this paper presents effect of pH on removal of COD, Oil and Greece, Turbidity and TSS.

Circuit arrangement for magnetic field generation

O. I. Olusola and K. D. Adedayo

  • Abstract

    An electrical circuit that is capable of producing a magnetic field of different strength using inductors of different inductance value have been designed and developed. The circuitry includes an electromagnetic coil for generating a magnetic field in response to a direct current (DC) power applied to the terminals of the coil and a gated triac connected in series with the coil for controlling application of direct current (DC) electric power to the coil. A 555 timer circuit is connected in an astable mode to serve as a gating circuit that develops a sequence of gating pulses. These pulses have a substantially constant voltage that extends for specified time duration to continuously excite the coil with DC power during the length of each pulse from the output of the clock circuit. Incorporated inside the circuit is also a microcontroller with a Liquid Crystal Display (LCD); the LCD shows the value of the magnetic field&

An Overview of Wireless Ad-hoc Sensor Networks

Ashigwuike, Evans Chinemezu and Iloh, John Paul Izuchukwu

  • Abstract

    A wireless ad-hoc network is a self-configuring network made up of mobile hosts which are connected by wireless links forming an arbitrary topology. Basically, a wireless sensor network consists of spatially distributed autonomous sensors deployed to co-operatively monitor certain physical or environmental conditions such as temperature sound, vibration, pressure, motion or pollutants etc [1]. Generally, this work presents an overview of wireless ad-hoc sensor networks (WASNs) detailing the basic goals and requirements for setting up such a network. The design approaches namely protocol-based and algorithmbased approaches for developing WASNs were also discussed. We also highlighted the various operating systems now available for WASNs. Example applications of wireless sensor networks were also presented.

An Exact Solution of MHD Natural Convection Flow of a Rotating Fluid with Radiation and First Order Chemical Reaction

Anil Sharma and Komal Choudhary

  • Abstract

    A boundary layer analysis has been made for unsteady of MHD convective flow past a vertical plate of a rotating fluid with radiation and first order chemical reaction. The results in the form of graphs for velocity, temperature and concentration have been shown.

  • Abstract