JECET : Journal of Environmental Science, Computer Science and Engineering & Technology. E-ISSN : 2278-179X

      JECET : Journal of Environmental Science, Computer Science and Engineering & Technology

Research Papers in Eng Science

Negative Sequence and Harmonic Currents Compensation in High-Speed Electric Railway

B. Pakkiraiah and L. Raja

In order to solve the power quality problem of negative-sequence and harmonic currents in high-speed railway traction systems, a novel power quality compensator is proposed, which is constituted by railway static power conditioner (RPC), two thyristor-controlled reactors and two thyristor-controlled 3rd filters. The RPC contains two converters which are connected back-to-back by sharing the DC link and is only used to transfer active power and suppress harmonics. The thyristorcontrolled 3rd filters are used to suppress 3rd harmonic current and change the phase angle of power supply current. The thyristor-controlled reactors are as the same used to change the phase angle of power supply current. The proposed power quality compensator has small capacity and low cost. Furthermore, based on the working principle of the proposed power quality compensator, its equivalent electrical models are established in fundamental and harmonic domain respectively. Simulation results are provided to demonstrate that the negative-sequence currents is zero and the THD of power arm current is reduced from 14% to 3%, after the proposed power quality compensator is run.

Bow-Tie Shaped Printed Antenna for UMTS/WLAN/WiMAX Applications

Stuti Srivastava and Vinod Kumar Singh

In this paper a probe fed bow-tie shaped antenna is designed and studied regarding return loss and gain. Frequency range of the proposed antenna ranges from 1.91 GHz to 3.236 GHz. This antenna can produce two resonant frequencies having return loss of -13 dB at 2.209 GHz and -21.02 dB at 2.904 GHz. The wideband impedance bandwidth is 63.84 %. The proposed bow-tie shaped antenna finds best application in UMTS (1.92 GHz- 2.17 GHz), WLAN IEEE 802.11 b/g (2.4 GHz- 2.48 GHz) and WiMAX (2.5 GHz- 2.69 GHz) bands and the simulations are carried in Zeland IE3D software.

Arrow Shape Microstrip Patch Antenna for WiMax Application

Rishabh Kumar Baudh, Ranjan Kumar and Vinod Kumar Singh

In this paper a line fed and slotted antenna has designed and experimentally studied. The proposed antenna has been designed using glass epoxy substrate of dielectric constant 4.4 to give a wide bandwidth of 38.96%. The antenna is suitable for WiMax application to operate in the frequency range of 1.967- 2.919GHz.

Hyper surfaces of a Birecurrent and Generalised Birecurrent Finsler Space

A. K. Srivastava, S. B. Misra, Kaushal Srivastava, R. B. Srivastava

In the present communication we have derived the conditions under which a totally geodesic hypersurface of a K% -birecurent and K% -generalised birecurrent Finsler space of first and second kinds is itself K% -birecurrent and K% -generalised birecurrent. In this co ntinuation we have also established that in the case of an umbilical hypersurface of a K% -birecurrent and K% -generalised birecurrent Finsler space of the two kinds the tensor Lalgb % is birecurrent and generalised birecurrent of the two kinds

Optimization Using Constrained Evolutionary Programming for Dynamic Economic Dispatch of Nigerian Po

Osofisan P.B., Izilein Fred A., Onyegbadue Ikenna A. and Ezomo P.I.

In this work, a research on the optimization of Nigerian power system was conducted. The optimization was achieved by the use of Constrained Evolutionary programming for Dynamic Economic Dispatch. This work illustrates how Evolutionary programming can be applied to optimize Nigerian power system in terms of generation and cost, using the Nigerian power system as a case study. Analysis was carried out on the optimization of the power system and the result obtained was compared with actual cost of generation already present at the generating station. This showed that economic dispatch benefits electricity users in a number of ways by systematically seeking the lowest cost of energy production, consistent with electricity demand, economic dispatch typically reduces total electricity cost. Economic Dispatch optimization, over the long term can encourage new investment in generation as well as in transmission expansion and upgrades that enhance both reliability and cost savings. This technique can be of relevance in reducing fuel cost in thermal generating station if well applied.

Multithreading Real Time Applications on Embedded System Using Fuzzy Controlled Braking System Based

S. Kannadhasan and R. Ragavendra

To design an advanced electronic active stability control system with ABS assistance for bikes providing the much needed vehicle roll stability control in situations such as high speed cornering etc. In cases of an emergency situation such as crashing, will send the bicycle accident location to nearby hospitals/emergency services without the assistance of costlier GPS tracking systems. Active Stability Control or Electronic Stability Control (ESC) is a safety feature that improves the vehicle stability by sensing yaw rate and roll rate in order to improve steering control in four-wheeled vehicles. It was introduced to improve passengers' safety in critical driving conditions such as cornering or sudden obstacle avoiding manure. This system uses the ABS at its heart for its longitudinal braking control and senses vehicle dynamics and drivers intention in order to stabilize the vehicle by avoiding rolling, skidding and loss of traction.

Motions Study of a Single Cylinder High Speed Spark Ignition Linear Engine with Electromagnetic Syst

Erastus O. Ogunti and Popoola R. Olaoluwa

This paper looks into the design and modeling of a linear engine. Quite a number of researches to improve the almost ubiquitous engines are going on. The linear engine is any engine that does not work by rotation but by linear reciprocating motion (a kind of up and down motion) by removing the crank mechanism of the conventional internal Combustion(IC) engines. Hence after the combustion process, a restoring force is required. Sequel to the development and design of the linear engine, it is necessary to carry out motion and torque analysis. The principle of combustion as it relates to the working of the linear engine is also explicated and its oscillation profiles are examined. The system relevant mathematical laws are modeled in 3D and engines models have been simulated. Five different software tools have been used in the simulation process. Autodesk Inventor3D has been used to design assembly and section out the engine models. However, combustion dynamics and torque profile generation was carried out in MATLAB. Electromagnetic force design and restoration process was shown using Simulink and the final simulation of the engine oscillation is carried out by Autodesk 3Ds max and VRML linked up with the Simulink package. Results have been generated in kinematics showing the pressure volume profiles and in dynamics showing the torque generation and work-done profile of the new engine model. The results have been compared to that of the conventional Otto cycle engine to observe the electromagnetic effect.


We are calling papers for Volume 7 and Issue 4 in all three sections.

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