Journal of Scientific and Engineering Research

1-11

Authors: Lamia Bakri Abd elhaleem Derar and Amin Babiker Abd elnabi Mustafa

In this paper we present a soft handover algorithm for wide band CDMA has been developed and implemented in the framework of a system level UMTS simulator, this algorithm depend on measurement of Average Received Signal and speed of user, the evaluated under the uplink and downlink UMTS system, the performance of the proposed algorithm is evaluated under different speed scenarios for User Equipment(UE) It shown via OPNET simulation, the proposed handover algorithm can effectively reduce the delay compared with Integrator Handover Algorithms, provided solution to improvement the performance in UMTS network by minimizing delay(Queuing sent delay, Uplink tunnel delay, Down link tunnel delay) and Packet loss ratio and BER and busy. Moreover, the total system throughput higher, the comparative analysis for all metrics carried out and gave the best performance for the proposed algorithm.

25-34

Authors: Ankuj Bala, Ramesh Chand

The onset of Rayleigh-Bénard convection in a horizontal layer of ferrofluid in Brinkman porous medium is investigated by using Galerkin weighted residuals method. Linear stability theory based upon normal mode analysis is employed to find expressions for Rayleigh number and critical Rayleigh number. The boundaries are considered to be free-free. ‘Principle of Exchange of Stabilities’ hold and the oscillatory modes are not allowed. The effects of magnetic parameters and Brinkman Darcy number on the stationary convection are investigated both analytically and graphically.

44-54

Authors: Almond D’Souza

In this paper, pulse-width-modulated (PWM) resonant inverter with (LCC) topology is presented for high Frequency ac power distribution systems High-frequency AC (HFAC) power distribution system (PDS) has recently received more and more attentions and has abroad application from electric vehicle to Micro-grid. The resonant inverter is commonly used to provide the fixed frequency output for point of load (POL) the inverter system is comprised of simple power and control circuitry. However, the control and implementation of high-frequency resonant inverter is complicated to provide good steady and dynamic performance, because of the worse operating circumstance from parameter uncertainties, inaccuracy model, as well as load and line perturbations The detailed analysis shows that the proposed inverter has very low total harmonic distortion, near-zero switching losses, and fast transient response. Open loop and Closed loop Simulation results are presented to prove the performance of the proposed inverter.

64-75

Authors: WISAM NAJM AL-DIN ABED

This paper presents the design of compensators for speed control of separately excited dc motor (SEDM) based on bacterial foraging optimization (BFO) technique. The social foraging behavior of Escherichia (E. Coli) bacteria has been used to optimize compensator performance by adjusting it's parameters (pole and zero locations as well as compensator gain).The SEDM mathematical model is used because it's more reality to the actual plant rather than linear transfer function model in the control design and studies and give more accurate results. The mathematical model is simulated using MATLAB R2014a simulink toolbox. The SEDM is loading for different loads ranging from no-load to full-load to test the compensator behavior and it's robustness for wide range of loadings variations. The results are compared with compensators designed using root locus method. The results show the superiority of BFO versus root locus method for both lead and lag-compensators design, which leads to improve the transient and steady state of speed responses of SEDM for different loads. The proposed method is very efficient and could easily be extended for other global optimization problems.

85-90

Authors: R. Surya Kiran

Purpose: There is a need to develop new and innovative methods for the STEM- Science, Technology, Engineering and Medical to ensure the very best results for the Owners /Clients /Customers /Users and in this regard now-a-days online calculators play a very crucial role altogether. This research paper makes the way into such an on-line study. Approach: The approach that was involved for this paper was the collection of the necessary web-links for the solution of the various problems/questions which normally involve with the time and the cost as the major constraints. Findings: From the solutions /resolutions and the dissolutions that were found, this could be concluded that this methodology could very well remove the time and the cost constraints altogether. Implications: This online research paper calls for the study on the bonding of the Six Sigma with the Service Quality for the Engineering Project Management. Originality: This research paper which is a completely an on-line one could proceed towards the UN-MANNED automation for the SYSTEMS Management.