Articles

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193 articles
51
Research Article DOI: 10.67897/njma.2018.oq4bmn4b

A Transshipment Model for a State Water Board

N. Nyor*, P. O. Evans, M. Idrisu, A. Salihu

The aim of this work was to model the transshipment of portablewater within Minna metropolis as a transportation problemin order to determine the optimal transshipment of potablewater to Minna metropolis that minimizes the transshipmentand mixed costs for Niger State Water Board.The computationalresults provided the minimal total shipment cost that is moree ective than the existing cost by the boa...

May, 2018 pp. 42-58 5 views 5 downloads
52
Research Article DOI: 10.67897/njma.2025.l5iurwxm

Enhancing Volatility Forecasting: A Comparative Study of GARCH(1,1) Models with Non-Normal Error Distributions

O. S. Makinde*, A. A. Olosunde, O. K. Agunloye

This study proposes a GARCH(1, 1) model with generalized logistic distribution (GLD) errors to better capture skewness and kurtosis in financial returns. Using crude oil price data, it compares GLD with GED and Student’s t-distributions. Results show the GLD-based model outperforms others in forecasting accuracy and volatility modeling.

Jun, 2025 pp. 43-50 10 views 3 downloads
53
Research Article DOI: 10.67897/njma.2017.k53fzmsn

Hydromagnetic radiative flow past a vertical oscillating plate with chemical reaction in presence of heat source

Peter F. FASOGBON*, Y. O. Tijani

In the present article, we study time-varying hydromagnetic chemically reacting free convective flow of a viscous, incom pressible radiating fluid past an infinite oscillating vertical plate with variable surface conditions subject to transverse magnetic field in the presence of temperature dependent heat source. Soret and Dufour effects are taken into consideration. The radiative heat flux is sim...

Sep, 2017 pp. 45−60 15 views 4 downloads
54
Research Article DOI: 10.67897/njma.2020.e9pigtpt

Third Derivative Block Hybrid Obrechkoff Methods

B. I. Akinnukawe*, O. A. Akinfenwa, S. A. Okunuga

This paper presents a family of Third Derivative Block Hybrid Obrechkoff Methods of Adams-type for solving stiff Initial Value Problems (IVPs). Multistep collocation techniques, with power series as basis function, are employed for the derivation of the continuous form of the hybrid methods. The continuous Hybrid Obrechkoff Methods are used to generate several implicit Hybrid Integrators that are ...

Mar, 2020 pp. 46-60 16 views 7 downloads
55
Research Article DOI: 10.67897/njma.2026.mq7kkwxh

Two-Dimensional Laminar Boundary Layers Hydromagnetic Arrhenius Kinetics Dissipative Fluid Reactive Flow in Non-Slip Conditions with Variable Properties

R. A. Kareem*, L. A. Animashaun, J. O. Ajilore

This study investigates non-slip hydromagnetic laminar dissipation flow with Arrhenius kinetics in binary reactions characterized by reaction order and variable properties within an unbounded isothermal device. The partial differentiation model is nondimensionalized to a thermofluidic dimensionless form. An invariant quasi-linear coupled ordinary derivative model is obtained using similarity quant...

Jun, 2026 pp. 47-62 31 views 6 downloads
56
Research Article DOI: 10.67897/njma.2022.1infh7eq

The Stability of Order m = 4 Rational Integrator for the Solution of Ordinary Differential Equation

F. Ebhohimen*, O. Anetor

In this article, investigation is carried out on a rational interpolation scheme of order m = 4, through two major processes of converting the resulting rational function to a complex outlook, and then, transforming the complex function to a polar form, from which the stability region of the method is constructed in the form of Jordan Curve. The regions of stability and instability as well as the ...

Jun, 2022 pp. 47-55 10 views 2 downloads
58
Research Article DOI: 10.67897/njma.2024.s3cbz7z8

On the Existence of Fixed Points Satisfying Graphic Contraction Conditions on an Open Ball

K. F. Adedapo, K. Rauf, Ismail Musa*

This paper investigates the existence of fixed points in complete metric spaces through the application of Ciri´c-type fixed ´ point principles for (α, ψ)-contractive mappings. By formulating the problem within an open ball of a complete metric space, we establish sufficient conditions that guarantee the existence of fixed points under this generalized contractive framework. An illustrative exampl...

Jun, 2024 pp. 48-63 11 views 6 downloads
59
Research Article DOI: 10.67897/njma.2019.uv8ct7po

On the Performance Assessment of Mean Methods in Estimating Process Capability for Skewed Distributions

J. O. Braimah*, S. O. Elakhe, N. Edike

This study compares the performances of Gini Mean, Clementsand Box-Cox transformation methods for estimating processcapability Indices when the distribution of the process data is(skewed) non-normal. The use of process performance index(PPI) is implored for process capability analysis (PCA) usingWeibull distribution. Data was simulated using R software witha decision interval (target point) of 1.0...

Dec, 2019 pp. 48-69 6 views 5 downloads
60
Research Article DOI: 10.67897/njma.2014.262fmksb

DERIVATION AND ANALYSIS OF BLOCK IMPLICIT HYBRID BACKWARD DIFFERENTIATION FORMULAE FOR STIFF PROBLEMS

MUHAMMAD, R.*, Y. A. Yahaya, L. Idris

The Hybrid Backward Differentiation Formula (HBDF) for the case k = 3 was reformulated into continuous form using the idea of multistep collocation. The continuous form wasevaluated at some grid and of grid points, which gave rise to discrete schemes employed as block methods for direct solution of the first-order ordinary differential equation y0 = f(x; y). Therequirement of a starting value and ...

Jun, 2014 pp. 49-57 4 views 4 downloads