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Metrological characterization of synthesized CNTs

Metrological characterization of synthesized CNTs

引用

3rd International Metrology Conference 2010, CAFMET 2010

作者： Ali, Salah H. R. Bedewy, M.K. Etman, M.A. Azzam, B.S. Giza Egypt Depart. of Engineering Misr Univ. for Science and Technology Egypt Mechanical Engineering Dept. Al-Ahram Higher Institute for Eng. and Tech. Egypt Design and Production Eng. Faculty of Engineering Cairo University Egypt

ISBN: (纸本)9781618390370

Nanotechnology has become extremely important in enhancing the potential of many applications. Carbon-nanotubes (CNTs) have been recently become the most promising functional materials in Nanocomposites. They have been extensively focused on over the past few years due to their unique structural features, amazing properties, and for their potential technological applications. The purpose of this paper is to conduct a parametric study to investigate the effect of the relevant different parameters that affect the CNTs yield rate, structure, and quality during their production in lab, using the submerged DC arc in de-ionized water technique. The set-up constructed specially for this purpose has been described. Effect of the current potential and intensity, the purity of the graphitic source, and the combination of the electrodes sizes on the yield rate of CNTs has been studied. 60A-24v DC current through1mm gap, 99.9 % pure graphite electrodes of diameters of 3mm for the anode against 12 mm for the cathode, have been found to produce the highest CNTs yield rate of 20 g/hr within the lab experimental limitations. The produced carbon nanotubes have then been investigated using Transmission Electron Microscopy (TEM) for the sake of capturing and visualizing the CNTs growth stages during synthesis.

关键词： Carbon nanotubes

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Source current type active filter application with double-LISN for EMI noise problem in induction motor control systems

Source current type active filter application with double-LI...

引用

SICE Annual Conference

作者： K. Gulez N. Mutoh M. Ogata F. Harashima K. Ohnishi Department of Electronic Systems Engineering Tokyo Metropolitan Institute of Technology Hino Tokyo Japan Faculty of Science and Technology Depart. of System Design Engineering Keio University Yokohama Japan

The source current detection type AF has a merit of robustness to the load variation, but a problem of the resonance between the AF and an LC filter often arises, if an LC filter is connected parallel to the AF. In this paper, double-LISN line impedance stabilization network circuit based AF, resonance analysis and the simulation results comparing with experimental ones are studied and discussed.

关键词： Active filters Electromagnetic interference Active noise reduction Induction motors Control systems Resonance Noise robustness Load management Impedance RLC circuits

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An approximation to improve EMI passive filter condition with triple-LISN for EMI noise problem

An approximation to improve EMI passive filter condition wit...

引用

SICE Annual Conference

Fixing conducted EMI problems with EMI filters is not en exact science. It normally involves a cut-and-trial process for a designer to come up with a proper filter design or approximation. As such, designing a filter is a time-consuming process for beginning engineers as well as for experienced engineers when they face new design circumstances. Due to this, predicting and solving EMI emissions related to Common Mode (CM) ones induction motor drive systems requires various frequency-dependent effects to be considered. The new conditions corresponding to the new technological improvements both software and hardware ones in our daily systems for Electro-Magnetic Interference (EMI) passive filter is considered. Thus, EMI passive filter approximation is studied on new Triple-LISN circuit structure especially for CM currents that can suppress EMI noises in some extend in the motor drive system.

关键词： Electromagnetic interference Passive filters Circuit noise design engineering Frequency Impedance Circuit simulation systems engineering and theory Process design Motor drives

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An approximation to model induction motor control systems by using dynamical system connection in decentralized method

An approximation to model induction motor control systems by...

引用

SICE Annual Conference

This paper describes an expression of dynamical system connection in decentralized autonomous control for complex induction motor control systems. Decentralized autonomous system has several elements which conduct autonomously and interact among them to realize the desired total motion or to reduce the number of elements of the system mathematically. In the dynamical approach, it is preferable that the system connection changes according to the environmental condition. It is very useful for the new conditions corresponding to the new technological improvements both software and hardware ones in such a complex system for electro-magnetic interference (EMI) active filter which is considered. Thus, EMI active filter approximation is studied on new triple-LISN circuit structure especially for CM currents that can suppress EMI noises in some extend in the motor drive system.

关键词： Induction motors Control system synthesis Control systems Automatic control Motor drives Electromagnetic interference Active filters Circuit noise Robots Robotic assembly

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Modeling an IGBT-inverter with neural networks in control environment

Modeling an IGBT-inverter with neural networks in control en...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： K. Gulez N. Mutoh F. Harashima K. Ohnishi Department of Electronic Systems Engineering Tokyo Metropolitan Institute of Technology Tokyo Japan Faculty of Science and Technology Depart. of System Design Engineering Keio University Yokohama Japan

ISBN: (纸本)0780370902

The IGBT is a very well-known power device used in most AC motor control applications. It is also a new power device according to most of the other power electronic developments in the last 10 years with an insulated gate input like that of the power MOSFET but with the low on-state resistance of a power bipolar transistor. Also, it is known that the IGBT functions as a bipolar transistor that is supplied base current by the drain of a MOSFET where the source of the MOSFET is shorted to the collector of the bipolar transistor. In this paper, the analytical model of the IGBT explained in the literature to match the drive circuit requirements is used with a neural network model of switching conditions of the inverter. Transient operation of the IGBT is considered to model a new type of device to prevent switching harmonics sourced by the inverter from being passed to the motor.

关键词： Insulated gate bipolar transistors Neural networks MOSFET circuits AC motors Bipolar transistors Inverters Power electronics Insulation Power MOSFET Current supplies

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ANN (artificial neural network) drive controller of space vector modulation increasing the performance of the induction motor and ensuring harmonic reduction

ANN (artificial neural network) drive controller of space ve...

引用

SICE Annual Conference

作者： K. Gulez H. Watanabe F. Harashima K. Ohnishi H. Pastaci Department Electronic Systcms enginccring Tokyo Metropolitan Institute of Technology Tokyo Japan Electrical Electronics Faculty electrical engineering Department Yildiz technical University Istanbul Turkey Faculty of Science and Technology depart. of System Design engineering Keio University Yokohama Japan

Control systems have assumed an increasingly important role in the development and advancement of modern civilization and technology. Practically, every aspect of day-to-day activities is affected by some type of control system. Thus, the space-vector technique has become a popular pulse width technique (PWM) for three-phase inverters in applications such as control of AC induction and permanent-magnet synchronous motors. Digital control structures eliminate drifts, solve complex mathematical equations and by using a programmable processor, they can be easily upgraded for new control algorithms. Digital signal processors (DSPs) go further; their high performance allows them to perform high resolution control and minimize control loop delays. These technological improvements supported by artificial neural networks (ANN) have enabled the development of really effective AC drive control with ever lower power dissipation hardware and ever more accurate control structures.

关键词： Artificial neural networks Pulse width modulation inverters Space technology Control systems Space vector pulse width modulation Pulse inverters Synchronous motors Digital control Equations Signal processing algorithms

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