Vol. 1 No. 2 (2009)

This paper describes the development of a circularly polarized microstrip antenna, as a part of the Circularly Polarized Synthetic Aperture Radar (CP-SAR) sensor which is currently under developed at the Microwave Remote Sensing Laboratory (MRSL) in Chiba University. CP-SAR is a new type of sensor developed for the purpose of remote sensing. With this sensor, lower-noise data/image will be obtained due to the absence of depolarization problems from propagation encounter in linearly polarized synthetic aperture radar. As well the data/images obtained will be investigated as the Axial Ratio…

Saguling Generation Business Unit (GBU) is one of hydro powerplants under PT. Indonesia Power which has vital role to produce and distribute electricity in Indonesia. The demand for electricity in Indonesia, which is fluctuative, force the plant to operate in immediate and responsive pattern. Saguling need 2 minute to connect to the transmission system from its non operating state. Plant response is controlled by manipulating guide vane opening so the water entering the turbine chamber can be maintained. 5.6 % maximum overshoot still occurs in start up process due to manual mechanism. This…

One of activities involved gripping activity is wall climbing sport. Physiologically, gripping activity involves finger flexor and finger extensor muscles at the lower arm. Naturally, muscles performance will decrease if muscles are given static or dynamic weight during certain time. This performance decrease is related with fatigue condition, which is also related with lactate acid accumulation, insufficient of metabolic reserve, and the decrease of neural activity in stimulating contraction[2]. Muscle fatigue characteristic experienced by participants were observed from the changing trend…

The aim of this study is to analyze the cost production of solar power utilization comparing with its annual yield especially in Indonesia. Solar cell module employed is poly-crystalline silicone with Peak Power 20 Wp, Power Current (Imp) 1.17 A and Power Voltage (Vmp) 17.1 V. To obtain the maximum power of the sun, the module is static fixed in 10-20 N adjusting to the equator line. The measurement is conducted in Timah Manufacture Polytechnic which is situated in 1020

An electric traction motor drive for an electric karting application was modeled for efficiency studies and simulated using the MATLAB®/Simulink® software. The model includes models of a battery, power electronic converter, electric motor, and vehicles dynamic of go-karts to a typical 48 seconds track driving schedule. The losses of each component of the electric traction motor drive were modeled and simulated over the entire speed range. In the battery was also calculated the state of charge (SOC) of the battery over the driving cycle. The regenerative braking energy captured was also…

Reactive compensation is required to maintain terminal voltage of induction generator under varying load and speed operation. A new variable shunt capacitor, which is called SVC magnetic energy recovery switch (SVC MERS), is proposed. The operation principle, characteristics of injected current, operating range of reactive compensation of SVC MERS in star and delta configuration were investigated. Application for induction generator voltage controller, which is required leading reactive compensator, is suitable for SVC MERS. Small scale experiments were conducted to verify the proposed system…