Analysis of some Aspects of Biology on Selected Fish species in River Hadejia, Jigawa State Nigeria

Analysis of some aspect of biology on selected species in River Hadejia, was carried out by analyzing the following, food and feeding habits using two method which are frequency of occurrence and dominant methods, forage to carnivore ratio,( F/C) was also estimated, water analysis was carried out purposely to find the food-fit in the body of water. The forage to carnivore ratio was estimated to be 3:1. while table 1-3 summaries the food items of Tilapia zill Orechromis niloticus and sarotherodon  galilaeus. Figure 1, summaries inter and intra specific competition among fish species. Keywords:- Frequency occurrence, dominant, forage carnivore, food

Investigation of aspects of reproductive cycles of some selected fish species in River Hadejia, Jigawa State, Nigeria.

This work aims to analyse some aspects of reproductive cycles of some selected fish species in River Hadejia was carried out from July 2012 at June 2013. The following aspects were considered, reproduction and breeding cycles, sex determination, fecundity and Gonado – Samatic Index (GSI). Table 1 and 2 show the summary of the results obtained. While tables 3-12 show the detailed results obtained for the different stages of maturity and gonad development. The Gonado Somatic Index (GSI) was calculated as the percentage of Gonad-weight per body weight. Fecundity was determined by direct enumeration using a digital counter and egg diameter was determined using ocular eye piece with stage micrometer. Keywords: Reproduction, fecundity, Gonad Somatic Index (GSI)

The slide away theory of lower hybrid bursts

In this paper two coupled diffusion equations for resonant wave-particle interactions are solved in the slide away regime. It is found that the wave grows and damps like the lower hybrid and ion sound modes respectively; and that the electron beam velocity and the wave energy density spectrum exhibit oscillations which reproduce some of the characteristics of lower hybrid burst. The model may be used to explain the lower hybrid wave bursts observed in the upper ionosphere. Journal of the Nigerian Association of Mathematical Physics Vol. 9 2005: pp. 61-6

Lower hybrid waves instability in a velocity–sheared inhomogenous charged dust beam

An electrostatic linear kinetic analysis of velocity-sheared inhomogeneous charged dust streaming parallel to a magnetic field in plasma is presented. Excited mode and the growth rates are derived in the lower hybrid-like mode regime, with collisional effects included. In the case where the drift velocity u is very small the velocity shear Ñu would dominate over density anisotropy Ñn in providing the free energy to drive the relevant instability in space plasmasJournal of the Nigerian Association of Mathematical Physics Vol. 8 2004: pp. 211-21

Streaming instability in a velocity–sheared dusty plasma

A two-stream instability, obtained from kinetic theory, of strongly velocity-sheared inhomogeneous streaming electron in a magnetized plasma in the presence of negatively charged dust is discussed. Various cold plasma approximations were considered and it is shown that when the diamagnetic effect of ion can be ignored, the excited mode could be dust lower hybrid-like. On other hand, if the dust is treated as immobile background, the excited wave is ion lower hybrid-like. In both cases, the growth rate is reduced due to the presence of the dust particles and the velocity shear scale length, LE, is on the order of k-1 (where k is wave vector) for the most unstable mode. An example is given from the plume. Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 601-60

Logarithmic perturbation theory: Applications and limitations

The time independent, non-degenerate standard perturbation theory is compared the alternate treatment of perturbation theory called logarithmic perturbation theory (LPT). For determining the non-degenerate ground state the LPT is, in principle, easier to apply than standard perturbation theory. This is because, as opposed to the standard perturbation method which requires the knowledge of the complete set of eigenvalues and eigenfunctions of the unperturbed system, for the LPT one only needs to know the ground state wave function of the unperturbed system, the energy correction to the next lower order and some easily computable coupling constants. However, in reality, the LPT is a simpler method to apply when the ground state wavefunction is exponential in nature. But as shown here for trigonometric unperturbed wave function the LPT leads to integrals which have no analytical solutions thereby making LPT more difficult and less accurate method than the standard perturbation approach. Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 595-60

Computation of the Skyrme–Hartree–Fock equations in the Cartesian deformed harmonic-oscillator basis

We present the modified version of the code HFODD which solves the nuclear Skyrme–Hartree–Fock problem using the Cartesian deformed harmonic-oscillator basis. The modified code gives (i) the general parameters for starting point of the iteration, that provides the convergence report (ii) maximum numbers of the HO quanta in three directions, (iii) the vacuum and particle-hole configurations for the case of the parity symmetry, (iv) the corresponding values of the coupling constants in the Skyrme functionals, (v) the average values of the total and intrinsic neutron, proton, and total angular momentum, it (vi) the corresponding values and contributions to the first moment of inertia and (vii) a summary of the energies calculated for the HF state. Items (ii) and (iv) we not obtainable using the original program.Journal of the Nigerian Association of Mathematical Physics, Volume 15 (November, 2009), pp 163 - 17

Evaluation of n + 16Fe reaction cross section at 14MeV incident energy

Cross section calculations have been carried out by some earlier scientists independent of energy surface imaginary potential. These have been characterized by a lot of disparity between authors and literature values. In this work, special attention was devoted to the increase in the accuracy of the calculation of nuclear data needed for structural materials. To do this, optical model (OM) scat 2 was applied using the deformed optical para magnetization. The results showed that the total cross section is numerically the sum of the shape elastic and compound nucleus formation cross section. Results obtained are in good agreement with literature values within ± 5%.Journal of the Nigerian Association of Mathematical Physics, Volume 15 (November, 2009), pp 171 - 17

Influence of tamarind pulp on growth and carcass characteristics of broiler chickens

A study was conducted to determine the influence of an aqueous solution of tamarind pulp on growth and carcass characteristics of broiler chickens. One hundred and sixty, one week old broilers were divided into 4 treatment groups replicated 4 times in a completely randomized design. The control group was given 0g/L tamarind pulp (TP) while the other groups received 20g/L, 30g/L and 40g/L tamarind pulp in drinking water. Feed and water were provided ad libitum throughout the 49 days experimental period. Results showed a significant (P<0.05) decrease in feed intake with increased tamarind pulp. The group that was given 30g/L TP had higher (P<0.05) final weight, body weight gain and feed efficiency. There were no significant (P<0.05) difference observed for water intake, slaughter weight, dressed weight and dressing percentage. Tamarind pulp had significant (P<0.05) influence on all cut- up parts. It was concluded that aqueous solution of 30g/L tamarind pulp in drinking water will improve performance without adverse effects on carcass measurements of broiler chickens