process of graphene _Co(OH)2 nano-composites: (a)interactionsbetweenGOandCo2+ and (b) depositionofCo2+ and deoxygenation of GO at the same time. Copyright (2010) American Chemical Society. Supercapacitors using graphene: Electrochemical capacitors have the advantage of charging and discharging in a few seconds. Although their energy density (about 5–10 W h/kg) is lower than in batteries or fuel cells‚ higher power density (10 kW/kg) can be reached in a short time [74]. The most attractive
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Graphene based Supercapacitors with Improved Specific Capacitance and Fast Charging Time at High Current Density Santhakumar Kannappana‚ Karthikeyan Kaliyappanb‚c‚ Rajesh Kumar Maniand‚ Amaresh Samuthira Pandianb‚ Hao Yange ‚ Yun Sung Leeb‚ Jae-Hyung Janga‚f and Wu Lua‚e* a) Department of Nanobio Materials and Electronics‚ Gwangju Institute of Science and Technology‚ Gwangju 500-712‚ Republic of Korea. b) Faculty of Applied Chemical Engineering‚ Chonnam National University‚ Gwangju‚ 500757
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DESCRIBTION AND PRATICAL APPLICATION OF ELECTRICAL COMPONENTS NAME: AMAN VIKASH CHAND ID NO. : 2011001207 GROUP: TDEEN 1A TEACHER: MR. WILLIAM FONG YEAR: 2011 |RESISTORS | |Resistors(R) are a two-terminal passive electronic component which implements electrical resistance as a circuit element. They are
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Literature Search Both Design 2 and Design 3 circuits uses the concept of voltage doubler rectifier in particular the Greinacher voltage doubler rectifier‚ where the components used are mainly capacitors‚ diodes. Light emitting diode (LED) and 3-turn coil are also incorporated into Design 2 and Design 3 circuits. There are two main reasons of using a voltage doubler rectifier. Firstly‚ the LED require a forward voltage of 1.7V to 2.2V‚ and the 3-turns coil on the implant will not be able to pick
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circuit. Resistor-capacitor circuits A circuit with a resistor‚ a capacitor‚ and an ac generator is called an RC circuit. A capacitor is basically a set of conducting plates separated by an insulator; thus‚ a steady current cannot pass through the capacitor. A time-varying current can add or remove charges from the capacitor plates. A simple circuit for charging a capacitor is shown in Figure 2 . | | | | | | Figure 2 | An RC circuit for charging a capacitor. | | | Initially
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of diodes and op amps (operational amplifier) connected with capacitor in series fashion to store and hold the peak values given by voltage supply. This circuit will store the highest value or peak value of the given voltage or hold the last given peak voltage to the circuit from the voltage supplier. Peak detector converts the Ac voltage to DC voltage and reduces the disturbance. The function can be explained as follow. The capacitor stores the current peak voltage. If the input voltage is larger
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Abstract This report contains an account of my final year project‚ which was carried out in the two and half year of the Electronic and Electrical of Engineering (EEE) diploma at Institut Teknologi dan Pengurusan Lebuh Victoria. This paper is based on the design and analysis of Heat Sensor with water pump system using cooling fan to reduce the temperature. This project was done to see the operation of heat sensor and how the water pump system and the cooling fan work. This project is divided into
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RC Circuits •In this presentation‚ circuits with multiple batteries‚ resistors and capacitors will be reduced to an equivalent system with a single battery‚ a single resistor‚ and a single capacitor. Kirchoff ’s laws will be stated‚ and used to find the currents in a circuit. In addition‚ the equation for the time-constant of an RC circuit will be derived. Ohm ’s Law When a battery is connected to a resistor‚ the battery will cause a current to flow through the resistor. The larger the voltage
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length of time a voltage is present at its input as the current through the feedback loop charges or discharges the capacitor as the required negative feedback occurs through the capacitor. Fig. 1 (a): Op-Amp Integrator Fig. 1 (b): Input-Output Characteristics When a step voltage‚ Vin is firstly applied to the input of an integrating amplifier‚ the uncharged capacitor C has very little resistance and acts a bit like a short circuit allowing maximum current to flow via the input resistor
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different frequencies. Instead‚ its function is to change the phase of the signal without affecting its amplitude. This type of filter is called an all-pass or phaseshift filter. Approaches To Implementing Filters: Active‚ Passive‚ And Switched-Capacitor: Passive Filters: The filters made up of
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