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Four Steps Continuous Method for the Solution of y″= f(x, y, y′)

American Journal of Computational Mathematics 2013年第2期3卷 169-174页

作者： Adetola Olaide Adesanya Mattew Remilekun Odekunle mfon odo udoh Department of Mathematics and Statistics Cross River State University of Technology Calabar Nigeria Department of Mathematics Modibbo Adama University of Technology Yola Nigeria

This paper proposes a continuous block method for the solution of second order ordinary differential equation. Collocation and interpolation of the power series approximate solution are adopted to derive a continuous implicit linear multistep method. Continuous block method is used to derive the independent solution which is evaluated at selected grid points to generate the discrete block method. The order, consistency, zero stability and stability region are investigated. The new method was found to compare favourably with the existing methods in term of accuracy.

关键词： Predictor Corrector Collocation Interpolation Power Series Approximant Continuous Block Method

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Some aspects of the biology of the female blue crab Callinectes amnicola(De Rocheburne)from the Cross River estuary,Nigeria

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Journal of Coastal Life Medicine 2015年第4期 259-264页

作者： Eyo Victor Oscar Akpan Michael mfon udoh Ifiok Solomon Fisheries and Aquaculture Unit Institute of OceanographyUniversity of CalabarP.M.B.1115CalabarCross River StateNigeria Fisheries Department Ministry of Agriculture and Natural ResourcesP.M.B.1113UyoAkwa Ibom StateNigeria Zoology and Environmental Biology Programme University of CalabarP.M.B.1115CalabarCross River StateNigeria

Objective:To investigate some important aspects of the biology of Callinectes amnicola(***)such as fecundity,carapace length-weight relationship,condition factor and carapace length frequency distribution from the Cross River estuary,***:A total of one hundred and twenty ovigerous females of ***,freshly caught with basket traps,lift net trap,and gill net were collected from the catches of the artisanal fisheries in the study area between June 2012 and May ***,carapace length-weight relationship,condition factor and carapace length frequency distribution were determined and analyzed following standard ***:Fecundity(F)ranged between 73090 eggs for crab of carapace length 8.1 cm and total weight 34 g and 809450 eggs for crab of carapace length 16.1 cm and total weight 395 g with a mean of 311808.93±17693.94 *** was a positive significant relationship between fecundity and carapace length,total weight and condition factor as follows:F=6839.7CL^(1.4403)(r^(2)=0.2145,P<0.05),F=15302TW^(0.5798)(r^(2)=0.4079,P<0.05),F=147255K^(0.2788)(r=0.2717,r^(2)=0.0738,P<0.05).A significant linear relationship between carapace length and weight of *** is given by the equation:Log W=2.0447LogL–0.1389(r^(2)=0.3357,P<0.05).The crab exhibited a negative allometric growth pattern(b=2.0447).Condition factor ranged between 21.48 to 104.95 with a mean value of 47.21±*** carapace length frequency distribution showed a unimodal class size ***:Findings of this study is crucial in assessing the population dynamics and development of management strategies of the the Blue crab,*** from the estuary such as mesh size regulation,fishing season and fishing ground regulation in the Cross River ***,findings of this study will be useful in evaluation of the aquaculture potential of the Blue crab ***,which is a valuable shell fish for the inhabitants estuary.

关键词： Callinectes amnicola Cross River estuary Fecundity Carapace length-weight parameters Condition factor Carapace length-frequency distribution

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