Nonplanar Geometry in Multi-Component Dust-Ion-Acoustic Shock Waves for Adiabatic Dusty Plasma

The modified Burgers’ equation of nonlinear propagation of Dust-Ion Acoustic Shock Waves (DIASWs) for multicomponent unmagnetized dusty plasma consisting of adiabatic ion fluid, Boltzmann distributed electrons and positrons and static negatively charged dust fluid has been derived using the standard reductive perturbation method. The solution of modified Burgers’ equation in nonplanar geometry is numerically analyzed and it has been found that, the nonplanar geometry effects have a very significant role in the formation of shock waves. Further more; it is found that the planar geometry shock structure with higher amplitude is the strongest, followed by cylindrical and spherical shock waves amplitudes respectively. It is also observed that; an increase in positron concentration decreases the amplitude of the DIASWs. Keywords: Nonplanar Geometry multicomponent, Dust- ion-Acoustic Shocks Adiabatic Dusty Plasm

Solutions of Schr\"odinger Equation with Generalized Inverted Hyperbolic Potential

We present the bound state solutions of the Schr\"odinger equation with generalized inverted hyperbolic potential using the Nikiforov-Uvarov method. We obtain the energy spectrum and the wave function with this potential for arbitrary - state. We show that the results of this potential reduced to the standard known potentials - Rosen-Morse, Poschl - Teller and Scarf potential as special cases. We also discussed the energy equation and the wave function for these special cases.Comment: 20pages, 5figure

Studies on relaxation length of wood by method of gamma radiation

Relaxation lengths of different types of wood were determined using gamma radiation from 60Co source. Results show that oxystigma (Oxystigma spp) has the highest relaxation length of 23.810 cm, while mangrove (Rhizophora spp) has the least relaxation length of 1.247 cm. A mathematical model has been developed for the prediction or determination of density (r) variation of wood with relaxation length. A good agreement (greater than 80%) was observed between the measured values and the predicted ones. With proper choice of the thickness of wood from theoretical evaluation, it was observed that Mangrove (Hard Wood) with thickness of 120 cm almost completely attenuate gamma ray energy in the range 0.1 Mev to 1.836 Mev. Keywords: relaxation Length, wood, and gamma radiation Nigerian Journal of Physics Vol. 17, 2005: 108-11

Preliminary studies on global solar radiation in Mbalmayo, Cameroon

This paper presents preliminary studies on the global solar radiation in a horizontal surface along with the prevailing meteorological conditions measured during the period 1999-2001 in Mbalmayo, Cameroon. Hourly, daily, and mean monthly values of global solar radiation and meteorological data were obtained from the International Institute of Tropical Agriculture automatic weather station of Mbalmayo. The data were processed as daily, hourly, sum of 10-day data for 8.00/12.00/16.00/20.00 hours, decadal hourly, decadal daily, and mean monthly data. The highest measured daily, decadal hourly, decadal daily, and mean monthly data for global solar radiation in Mbalmayo was found to be 29.7, 2.76, 21.8, and 20.1 MJm2, respectively. The highest hourly global solar radiation value up to 182.44 MJm2 was observed between March 21-31, 1999. Apart from the global solar radiation measurements, the main observed meteorological parameters were, soil temperature, temperature, wind speed, precipitation, and relative humidity. The results show that there exist seasonal tendencies in the variation of global solar radiation. The range of variation of these radiations and the distribution puts Mbalmayo has a high potential for solar energy utilization

Effect of ion-fluid temperature on dust-ion-acoustic solitons with non-thermal electrons

We have investigated the properties of dust-ion-acoustic (DIA) solitons using the reductive perturbation method in an unmagnetized dusty plasma, whose constituents are adiabatic ion-fluid, nonthermally distributed electrons and static dust particles. We have also derived the korteweg-de Vries (KdV) equation with its stationary solution analyzed. KdV equation of the present paper reduces to the Kdv equation of Sayed and Mamun if we set the nonthermal parameter equal to zero.Hemos investigado las propiedades de solitones de polvo-iónico-acústico (DIA) utilizando el método de perturbación reductora en un plasma de polvo magnetizado, cuyos componentes son fluidos-iones adiabáticos, los electrones y las partículas de polvo estático son distribuidos no termalmente. También hemos obtenido la ecuación de Korteweg-de Vries (KDV) con su solución estacionaria analizada. La ecuación KDV del presente trabajo se reduce a la ecuación KDV de Sayed y Mamun si fijamos el parámetro no térmicos igual a cero

Bound states solution of Klein-Gordon Equation with type -I equal vector and Scalar Poschl-Teller potential for Arbitray l -State

ABSTRACT We solve the bound state solution of Klein-Gordon equation for Poschl-Teller potential via the Nikiforov-Uvarov method. We obtain the energy eigen values and the wave function in terms of hypergeometric function

Wave packet evolution of damped oscillator with a time dependent linear potential

We discuss the general solution of a time-dependent Schrödinger wave equation (SWE) with time-dependent linear potential within the framework of invariant operators.Se discute la solución general de una ecuación de onda de Schrödinger dependiente del tiempo con un potencial lineal dependiente del tiempo dentro del marco de referencia de operadores invariantes

Quantum Damped Mechanical Oscillator

The exact solutions of the Schrödinger equation for quantum damped oscillator with modified Caldirola-Kanai Hamiltonian are evaluated. We also investigate the cases of under-, over-, and critical damping