(Volume 02 - Issue 05) (November 2017)


Title:
An Intracellular Differential Equation Model For The Dynamics Of Hepatitis B Virus (Hbv) Infection With Immune Control
Authors:
Titus Ifeanyi Chinebu, Remigius Okeke Aja, Godwin C.E. Mbah
Source:
International Journal of Precious Engineering Research and Applications, pp 01-11, Vol 02 - No. 05, November 2017
Abstract:
We analyzed a non linear intracellul.ar ordinary differential equation model of the Hepatitis B Virus infection that considers the interaction between the hepatocyte, free virus and immune response. The non negative steady state of the model equation shows that the uninfected and the coexisting states were the only equilibrium points while the wholly infected state is not an equilibrium point. From further analysis of the stability, we observe that the steady state of the model is asymptotically stable If β which is Hepatitis B virus infection capability is weak, a_3 which is hepatitis B virus replication ability is also slow, CTL growth and production a_4 is rapid, strong and active and the CTL defense ability (b_1+b_2 ) is large enough to eliminate the virus from the blood and liver entirely.
Keywords:
Mathematical model, HBV infection, Hepatocytes, Immune Response, Equilibrium.
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Title:
Geography Subject Head Supervisory Roles In Teaching And Learning Process in Matungu, Kenya
Authors:
Dr.JaredAnyona, Sr.Dr.Mutisya Sabina, Mr.Chegenye Alex Alindulah
Source:
International Journal of Precious Engineering Research and Applications, pp 12-16, Vol 02 - No. 05, November 2017
Abstract:
This study investigated on the effectiveness of subject heads supervisory roles in the teaching and learning of geography in Matungu, Kakamega County, Kenya. The study was grounded by the Total Quality Management theory of Deming, Juran and Feigenbaum (1961).Aconvergentparalleldesign was used to collect both qualitative and quantitative data. The researcher targeted teachers, subject heads of geography and principals of secondary schools. Data was collected through questionnaires, interview schedules and document analysis guide. Quantitative data collected were analyzed using descriptive statistics such as frequencies and percentages, qualitative data were summarized in themes and presented in narrative form as well as direct quotes from participants. Findings revealed that the supervisory roles of subject heads were conducting regular meetings with subject teachers, signing of professional records and ensuring that there were well-set assessment and examination policies within the department.The study recommended that the Ministry of Education should be able to allocate adequate funds towards teachers‟ in-service programmes andthe principals to provide constant and adequate information to the subject heads on supervision activities as well as professional development among others.
Keywords:
Subject heads, supervision, examination, schools
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Title:
Improving ECG Signal using Nuttall Window-Based FIR Filter
Authors:
V. O. Mmeremikwu, C. B. Mbachu, J. P. Iloh
Source:
International Journal of Precious Engineering Research and Applications, pp 17-22, Vol 02 - No. 05, November 2017
Abstract:
The heartis an important organ of the body whichis capable of producing an electrical signal known as Electrocardiogram (ECG). This signal isvery vital in diagnoses of heartdiseases as itcanbeusedto ascertain the medical condition of the heart at any time. Unfortunately, other signals may be picked up during the process of recording the ECG with an electrocardiograph. Such signals may hinder the possibility of obtaining accurate ECG reading for a patient which may lead to wrong diagnosis. These unwanted signals also referred to as noise or artifact may include powerline noise, baseline wander and electromyogram (EMG). This paper demonstrates how a 0.1mV 50Hz powerline noise can be removed from a contaminated single cycle ECG signal using a Nuttall window-based Finite Impulse Response (FIR) filter. MATLAB simulation software was used both for generation of the single cycle ECG signal and implementation of the FIR filter model. The results obtained show that the FIR filter designed with Nuttall window successfully removed the powerline noise.
Keywords:
ECG Signal, FIR filter, Noise reduction, Nuttall window, 50Hz powerline
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Title:
Lyapunov-Type Inequalities For A Fractional q-Difference Equation Involving p-Laplacian Operator
Authors:
Yiding Liu, Chengmin Hou
Source:
International Journal of Precious Engineering Research and Applications, pp 23-30, Vol 02 - No. 05, November 2017
Abstract:
In this paper, we present new Lyapunov-type inequalities for a boundary value problem of
fractional q- difference equation with Laplacian operator. The obtained inequalities are used to obtain a lower
bound for the eigenvalues of corresponding equations.
Keywords:
Lyapunov-type inequality, fractional q- derivative, eigenvalues, Boundary Value Problem.
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Title:
Influence of Penstock Outlet Diameter And Turbine Hub To Blade Ratio on The Performance of A Simplified Pico Hydropower System
Authors:
Alex Okibe Edeoja, Lydia Ene Ajeibi, AniekpongDonatus Effiong
Source:
International Journal of Precious Engineering Research and Applications, pp 31-46, Vol 02 - No. 05, November 2017
Abstract:
A study to determine the effect of penstock outlet and runner hub to blade ratio on the performance of an existing simplified Pico hydro system was been conducted. Five turbine runners with 10 V-shaped blades and hub to blade ratios of 0.7, 0.65, 0.55, 0.4, and 0.3 were fabricated and tested. The turbine was connected to a 3.9 kVA alternator via a V-belt drive and a 1 Hp pump was used to circulate water in the system. The speed of the alternator and turbine shafts were measured, and the water level in the two reservoirs were monitored. The results obtained showed that the Pico hydro system with 0.55 runner hub to blade ratio and 20 mm penstock outlet diameter yielded an alternator shaft speed of 1732 rpm. This corresponds to a computed power output of 5.77 kW. In terms of the loss of the alternator speed compared to the ideal value, the hub to blade ratio of 0.55 also gave the least percentage loss with the corresponding penstock outlet diameter being 25 mm. The parameters all statistically varied significantly at 95% level of confidence. The results are good encouragement in the effort towards implementing the system as an environmentally clean and decentralized source of energy.
Keywords:
Alternator shaft speed, decentralized source of energy, environmentally clean, Hub to blade ratio, Penstock outlet diameter, Turbine shaft speed.
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