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    Transcranial direct current stimulation (tDCS) and transcranial magnetic stimulation (TMS), are non-invasive, painless brain stimulation that uses electrical currents to stimulate specific parts of the brain. With tDCS a constant, low intensity current, powered by a nine volt battery, is passed through two electrodes placed over the head which modulates neuronal activity. Transcranial direct current has two types of stimulation: anodal and cathodal. Anodal stimulation excite neuronal activity while

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    be increased and the speed will fall. If the frequency is increased, the speed will increase and the developed torque will be decreased. This method is rarely used in the control of induction motors due to the magnetic saturation which causes high currents and losses. Figure 3.2 shows the curve of speed torque control by frequency variation. The developed torque decreased under higher frequencies while it increases with low speeds. Figure 3.2: Torque speed characteristics with variable frequency control

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    Induction Motors Research

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    Chapter 1: Introduction 1.1 Background of study Induction Motors are widely used in industrial applications. It has been reported that they have a motor market share of approximately 80 percent. Their popularity stems from robust construction, low cost and ease of maintenance. As induction motors operate at a constant speed, they provide efficient operation in industrial applications if the loads that they drive remain fairly constant. However, the loads vary when the process conditions change during

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    electromagnetic geophysical methods have been used extensively and with great success to delineate conductive zones at depths. The aim of EM method responds to high conductivities rather than to contrasts in conductivity as is the case with the classical direct current (DC) method. This means that EM methods can detect small changes in conductivity in a conductive terrain by the correct selection of technique and array and secondly that resistive layers became transparent in contrast to the DC resistivity method

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    Solar Cell Experiment

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    convert light energy to electrical energy, so are transducers. Aim 1: To investigate any relationship present between the distance between a solar cell and a lamp, and the current output of the solar cell, at a fixed voltage. Aim 2: To investigate any relationship present between the power supplied to a bulb, and the current of a solar panel, at a fixed distance apart. When investigating a solar cell, there are several variables we could investigate. Below, I have analysed all the variables

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    the sun is converted to direct current (DC) electricity. It utilizes materials which absorb photons of lights and relinquish electrons charges. It can be utilized for making electric engenderers. The rudimental element of these engenderers is denominated a PV cell. A power electronic interface, e.g., as an inverter, operates in grid-connected mode; the voltage and frequency are tenacious by the utility grid. To maintain the operation power factor unitary the injected current is defined by the power

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    Supercapacitors Essay

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    energy, providing good power output as well as being able to be charged and discharged rapidly without deterioration of any type. A typical power storage device can be characterized by its power density and its energy density, noting that with our current technology, none which can achieve the best of both. A relatively new technology, electrochemical double-layer capacitors or also known as supercapacitors, ultracapacitors

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    Ever since my days in middle school in China, I have dreamed of being an electrical engineer. My father nurtured my copious ideas such as transformer and inductor. Even though I didn’t have too much idea about electrical engineering, I found abundant happiness though work activities that included practical and hand-on problems. During the past three years, I learned a lot concept including semiconductor, electromagnetic and signal at University of Illinois. I have explored ECE widely and eventually

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    important characteristics of any transistor are speed scalability, and power. These three characteristics are seen directly by the user, and thus are the make or break factors of any type of transistor. So in order for any new transistor to replace the current technology, silicon MOSFET, it much at least match, if not outperform, these three characteristics. 1) Speed . Thanks in part to the carbon nanotubes’ unique one-dimensional nature; it is able to utilize ballistic transport. Ballistic

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    From programming microchips to building efficient solar panels, electrical engineering is a pervasive field that has a plethora of job opportunities. Essentially, “Electrical Engineering deals with the study and application of electricity, electronics, and electromagnetism in all of their forms” (What Is Electrical Engineering?) and work on creating electrical machinery such as “electric motors, radar and navigation systems, communication systems, and power generation equipment” (Electrical and

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