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Full-Text Articles in Electronic Devices and Semiconductor Manufacturing

Science Behind The Magnetic Field Therapy, D. B. Thombre,, Megha D. Thombre Oct 2015

Science Behind The Magnetic Field Therapy, D. B. Thombre,, Megha D. Thombre

Innovative Research Publications IRP India

Magnetic therapy is the use of magnets to relieve pain in various areas of the body. It is the simplest, cheapest and entirely painless system of treatment with no side effects. In present article, discussion of fundamental aspect about the application of magnetic field (Natural and artificial) and how it apply to the human body with suggestions. Magnetic field is produce by magnet or electromagnetic generating devices are able to penetrate the human body because human body is magnetic hence magnetic field affect the functioning of human body. Suggestions are, High blood pressure person sleep with foots towards west and …

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Feature Extraction Of Rich Texture Document, Innovative Research Publications Irp India, Prajwalita Satish Ravan, Shrinivas A. Patil, Swapnil V. Vanmore Mar 2015

Feature Extraction Of Rich Texture Document, Innovative Research Publications Irp India, Prajwalita Satish Ravan, Shrinivas A. Patil, Swapnil V. Vanmore

Innovative Research Publications IRP India

We describe here an efficient algorithm for reassembling one or more unknown objects that have been broken or torn into a large number N of irregular fragments. The puzzle assembly problem has many application areas such as restoration and reconstruction of archeological findings, repairing of broken objects, solving jigsaw type puzzles, molecular docking problem, etc. The pieces usually include not only geometrical shape information but also visual information such as texture, color, and continuity of lines. This paper presents a new approach to the puzzle assembly problem that is based on using textural features and geometrical constraints. The texture of …

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A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef Nov 2014

A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef

Saad Mekhilef

Under fast varying solar irradiation and load resistance, a fast-converging maximum power point tracking system is required to ensure the photovoltaic system response rapidly with minimum power losses. Traditionally, maximum power point locus was used to provide such a fast response. However, the algorithm requires extra control loop or intermittent disconnection of the PV module. Hence, this paper proposes a simpler fast-converging maximum power point tracking technique, which excludes the extra control loop and intermittent disconnection. In the proposed algorithm, the relationship between the load line and the I–V curve is used with trigonometry rule to obtain the fast response. …

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Wave-Shaped Mask Of Fabricating Nano-Scaled Structure, Fang-Tzu Chuang Aug 2014

Wave-Shaped Mask Of Fabricating Nano-Scaled Structure, Fang-Tzu Chuang

Fang-Tzu Chuang

A wave-shaped mask for fabricating a nano-scale structure is disclosed. The wave-shaped mask comprises an elastomeric transparent substrate having an upper surface and a lower surface, and a light-penetrable thin film layer disposed on the upper surface of the elastomeric transparent substrate. The upper surface of the elastomeric transparent substrate and the light-penetrable thin film layer are in a periodic wave shape, and the lower surface of the elastomeric transparent substrate is in a plate shape.

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Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef Jun 2014

Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef

Saad Mekhilef

new multilevel DC-link three-phase five-level voltage source inverter topology is introduced here. A multilevel DClink formed from single DC voltage supply and two cascaded half-bridge (CHB) power cells is connected to 12-switch threephase bridge in such a way that the proposed inverter produces five levels in the output voltage waveform. Compared to comparable inverters, such as symmetrical CHB and hybrid multilevel inverters, the proposed topology maximises the number of voltage levels and reduces the number of utilised DC voltage supplies, switches, gate driver circuits and installation area. A modified fundamental frequency modulation technique based on determination of switching states of …

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Method Of Fabricating Wave-Shaped Mask For Photolithography And Exposure Method Of Fabricating Nano-Scaled Structure Using The Wave-Shaped Mask, Fang-Tzu Chuang Jun 2014

Method Of Fabricating Wave-Shaped Mask For Photolithography And Exposure Method Of Fabricating Nano-Scaled Structure Using The Wave-Shaped Mask, Fang-Tzu Chuang

Fang-Tzu Chuang

A method of fabricating wave-shaped mask is disclosed. The method of fabricating wave-shaped mask comprises the steps of providing an elastomeric transparent substrate comprising an upper surface and a lower surface, applying a stable force to the elastomeric transparent substrate for deforming the elastomeric transparent substrate, forming a light-penetrable thin film layer on the upper surface of the elastomeric transparent substrate, and removing the force applying to the elastomeric transparent substrate, whereby the upper surface of the elastomeric transparent substrate and the light-penetrable thin film layer are in a periodic wave shape and the lower surface of the elastomeric transparent …

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Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef May 2014

Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef

Saad Mekhilef

A boundary control scheme for dual-output boost converter (DBC) with enhanced performance using second-order switching surface is presented in this study. The derivation of the switching surface is performed in state-energy plane rather than the state-plane to obtain a general geometrical representation that provides a good dynamic response during start-up and sudden load changes, achieving steady state in two switching actions. To illustrate the control characteristic and performance, a detailed mathematical analysis is fully developed and compared with other control methods for the DBC. The proposed control was simulated, implemented in a digital signal processor TMS320F2812, and tested using prototype …

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Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef Jan 2014

Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef

Saad Mekhilef

Under partial shading conditions, multiple peaks are observed in the power–voltage (P–V ) characteristic curve of a photovoltaic (PV) array, and the conventional maximum power point tracking (MPPT) algorithms may fail to track the global maximum power point (GMPP). Therefore, this paper proposes a modified incremental conductance (Inc Cond) algorithm that is able to track the GMPP under partial shading conditions and load variation. A novel algorithm is introduced to modulate the duty cycle of the dc–dc converter in order to ensure fast MPPT process. Simulation and hardware implementation are carried out to evaluate the effectiveness of the proposed algorithm …

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Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef Jan 2014

Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef

Saad Mekhilef

Long-term forecasting of wind speed has become a research hot spot in many different areas such as restructured electricity markets, energy management, and wind farm optimal design. However, wind energy with unstable and intermittent characteristics entails establishing accurate predicted data to avoid inefficient and less reliable results. The proposed study in this paper may provide a solution regarding the long-term wind speed forecast in order to solve the earlier-mentioned problems. For this purpose, two fundamentally different approaches, the statistical and the neural network-based approaches, have been developed to predict hourly wind speed data of the subsequent year. The novelty of …

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New Three-Phase Multilevel Inverter With Reduced Number Of Power Electronic Components, Saad Mekhilef Dec 2013

New Three-Phase Multilevel Inverter With Reduced Number Of Power Electronic Components, Saad Mekhilef

Saad Mekhilef

In this paper, a new configuration of a three-phase five-level multilevel voltage-source inverter is introduced. The proposed topology constitutes the conventional three-phase two-level bridge with three bidirectional switches. A multilevel dc link using fixed dc voltage supply and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. The fundamental frequency staircase modulation technique is easily used to generate the appropriate switching gate signals. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods …

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Novel Three-Phase Asymmetrical Cascaded Multilevel Voltage Source Inverter, Saad Mekhilef Feb 2013

Novel Three-Phase Asymmetrical Cascaded Multilevel Voltage Source Inverter, Saad Mekhilef

Saad Mekhilef

Series connection of power cells in asymmetrical cascaded configurations helps to cancel redundant output levels and maximise the number of different levels generated by the inverter. A new configuration of three-phase multilevel asymmetrical cascaded voltage source inverter is presented. This structure consists of series-connected sub-multilevel inverters blocks. The number of utilised switches, insulated gate driver circuits, voltage standing on switches, installation area and cost are considerably reduced. Cascaded-cell DC voltages in each inverter leg form an arithmetic sequence with common difference of E. With the selected inverter DC sources, high-frequency pulse-width modulation (PWM) control methods can be effectively applied without …

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Z-Source Inverter For Automotive Applications, Omar Ellabban, Joeri Van Mierlo Dec 2012

Z-Source Inverter For Automotive Applications, Omar Ellabban, Joeri Van Mierlo

Omar Ellabban

No abstract provided.

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Capacitor Voltage Control Techniques Of The Z-Source Inverter: A Comparative Study, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire Dec 2012

Capacitor Voltage Control Techniques Of The Z-Source Inverter: A Comparative Study, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

The Z-source inverter (ZSI) is a recently proposed single-stage power conversion topology. It adds voltage boost capability for complementing the usual voltage buck operation of a traditional voltage source inverter (VSI) with improved reliability. In this paper, a single-loop and dual-loop capacitor voltage control techniques for the ZSI are digitally designed based on a third order small signal model of the ZSI, implemented using a digital signal processor (DSP) and compared. Simulation and experimental results of a 30 kW ZSI during input voltage changes, load disturbances and steady state operations are presented and compared. The results show that the dual-loop …

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Multi-Hole Waveguide Directional Couplers, Mahmoud Moghavvemi, Hossein Ameri Mahabadi, Farhang Alijani Nov 2012

Multi-Hole Waveguide Directional Couplers, Mahmoud Moghavvemi, Hossein Ameri Mahabadi, Farhang Alijani

Hossein Ameri Mahabadi

1. Introduction The directional couplers are inherently assumed as four-port devices, which consisted of two transmission lines that are electromagnetically coupled to each other. The first port is named as input, and the second one as output or transmitted, the third one as sampling or coupled and the fourth one as isolated or terminated. By using a special design the input power is divided between output and coupled port in a certain ratio named coupling factor. The required value for coupling factor P1/P3 defines the range of applications for directional couplers. Based on the application, coupling factor could be any …

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Speed Sensorless Torque Control Of An Ipmsm Drive With Online Stator Resistance Estimation Using Reduced Order Ekf, Emad Gameil Shehata E. G. Shehata Oct 2012

Speed Sensorless Torque Control Of An Ipmsm Drive With Online Stator Resistance Estimation Using Reduced Order Ekf, Emad Gameil Shehata E. G. Shehata

Emad Gameil Shehata E. G. Shehata

Speed sensorless control of an interior permanent magnet synchronous motor (IPMSM) based on direct torque control (DTC) is proposed in this paper. The rotor speed and position of the IPMSM are estimated based on an active flux concept, where, the active flux vector position is identical to the rotor position. The proposed algorithm does not require neither high frequency injection signal nor complicated schemes even at vary low speed operation. Torque/ flux sliding mode controller (SMC) combined with space vector modulation is proposed to improve the performance of the classical DTC. Stator resistance value is required for a stator flux …

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Digital Control Of Three Phase Three-Stage Hybrid Multilevel Inverter, Saad Mekhilef Sep 2012

Digital Control Of Three Phase Three-Stage Hybrid Multilevel Inverter, Saad Mekhilef

Saad Mekhilef

Three-stage 18-level hybrid inverter design with novel control method is presented. The inverter consists of main high-, medium-, and low-voltage stages connected in series from the output side. The high-voltage stage is a three-phase, six-switch conventional subinverter. Themedium- and low-voltage stages are made of three-level subinverters constructed by H-bridge units. The proposed control strategy assumes a reference input voltage vector and aims to approximate it to the nearest inverter vector. The control concept is based on holding the high-voltage state as long as it is feasible to do so. The reference voltage vector has been represented in a 60 -spaced …

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Analysis And Implementation Of Transformerless Lcl Resonant Power Supply For Ozone Generation, Saad Mekhilef May 2012

Analysis And Implementation Of Transformerless Lcl Resonant Power Supply For Ozone Generation, Saad Mekhilef

Saad Mekhilef

This paper describes the analysis and design of an LCL resonant power supply for ozone generation. The main advantage of the proposed topology is the absence of high-voltage transformer; the high voltage gain is achievable by means of doubleresonance phenomena. Furthermore, the bandwidth is wider than the ordinary LC and its phase difference is constant over specific frequency range; as a result, an open-loop operation can be implemented. The complete analysis and design procedure of the power supply is presented. The design procedure is verified by implementing the power supply to drive a dielectric barrier discharge prototype ozone chamber. The …

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Planning Of Low-Cost 77-Ghz Radar Transceivers For Automotive Applications, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi Apr 2012

Planning Of Low-Cost 77-Ghz Radar Transceivers For Automotive Applications, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi

Hossein Ameri Mahabadi

The key to prevent driving accidents by automotive radar systems at high speed is to have optimum and accurate estimation of position representation and fast visualization of the environment.

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An Improved Particle Swarm Optimization (Pso)–Based Mppt For Pv With Reduced Steady-State Oscillation, Saad Mekhilef Jan 2012

An Improved Particle Swarm Optimization (Pso)–Based Mppt For Pv With Reduced Steady-State Oscillation, Saad Mekhilef

Saad Mekhilef

No abstract provided.

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Fabricate An 8.35-Ghz Frequency Synthesizer, A. Attaran, Hossein Ameri Mahabadi, M. Moghavvemi Sep 2011

Fabricate An 8.35-Ghz Frequency Synthesizer, A. Attaran, Hossein Ameri Mahabadi, M. Moghavvemi

Hossein Ameri Mahabadi

The article presents information on designing a low-noise frequency synthesizer for achieving low-phase-noise outputs past 8 GHz for digital microwave radios (DMRs). These synthesizers can be used with the DMRs, depending on advanced digital modulation such as quadrature-amplitude-modulation (QAM) and quadrature-phase-shift-keying (QPSK) formats.

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Exposing To Emf, Mahmoud Moghavvemi, Farhang Alijani, Hossein Ameri Mahabadi, Maryami Ashayer Soltan Jul 2011

Exposing To Emf, Mahmoud Moghavvemi, Farhang Alijani, Hossein Ameri Mahabadi, Maryami Ashayer Soltan

Hossein Ameri Mahabadi

No abstract provided.

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Assembly Of Low Phase Noise Sub-Millimeter Wave Local Oscillator In Ku Band Frequency, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran Jul 2011

Assembly Of Low Phase Noise Sub-Millimeter Wave Local Oscillator In Ku Band Frequency, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran

Hossein Ameri Mahabadi

A design and fabrication of a dual-band synthesizer device is presented in this paper. The noise analysis in synthesizer loop block component is modeled individually. The Design methodology is elaborated along with the test results. The initial frequency synthesizer in 1.8-2.4GHz frequency range (L and S-band) is designed and it is multiplied by 8. Microstrip bandpass filters (LFCN) are used to filter out the spurious frequency contents; the final output frequency is 14-20GHz (Ku-band). Phase noise investigation, design steps, filter assembling of 14-20GHz synthesizer is presented in this paper.

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Novel Client Booking System In Klcc Twin Tower Bridge, Hossein Ameri Mahabadi, R. Ameri Jul 2011

Novel Client Booking System In Klcc Twin Tower Bridge, Hossein Ameri Mahabadi, R. Ameri

Hossein Ameri Mahabadi

This system should help managing the visitors and tour guides as well as scheduling tours to visit “Petronas Twin Towers Sky Bridge”. The system should at least support the following characteristics. It should keep track of visitors and or tourists. It should keep information about tour guides and their working hour and other related information about such employees. The administrators should be able to schedule their visiting hours. This is a work-flow system and it need to keep track of daily visitors. The requirement was meant for this system is straight forward and very clear with so little complexity. On …

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A Compact Analytical Design Of Dual-Loop 18 Ghz Frequency Synthesizer To Enhance Signal Reliability In Digital Millimeter Radio Link System, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran Jul 2011

A Compact Analytical Design Of Dual-Loop 18 Ghz Frequency Synthesizer To Enhance Signal Reliability In Digital Millimeter Radio Link System, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran

Hossein Ameri Mahabadi

In this paper a high resolution dual-loop 17.7–19.7 GHz frequency synthesizer is presented which is compatible with ITU-R (F.595-6) standards. The investigations of phase noise and spur frequency contents are discussed in detail. The simulated and measured phase noise and spur frequency contents are similar to one another. Phase noise of –81 dBc/Hz in 17.7 GHz at 10 KHz offset frequency is measured by (HP8560) series Spectrum analyzer and it matches with predicted measurements.

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Body-Biased Vco Tunes 12 To 16 Ghz, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran Apr 2011

Body-Biased Vco Tunes 12 To 16 Ghz, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran

Hossein Ameri Mahabadi

This body-biased voltage-controlled oscillator provides reasonably good phase-noise performance over a broad tuning range with relatively low power consumption and low jitter timing noise in the time domain.

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Control Of A Bidirectional Z-Source Inverter Forelectric Vehicle Applications In Different Operation Modes, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire Mar 2011

Control Of A Bidirectional Z-Source Inverter Forelectric Vehicle Applications In Different Operation Modes, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

This paper proposes two control strategies for the bidirectional Z-source inverters (BZSI) supplied by batteries for electric vehicle applications. The first control strategy utilizes the indirect field-oriented control (IFOC) method to control the induction motor speed. The proposed speed control strategy is able to control the motor speed from zero to the rated speed with the rated load torque in both motoring and regenerative braking modes. The IFOC is based on PWM voltage modulation with voltage decoupling compensation to insert the shoot-through state into the switching signals using the simple boost shoot-through control method. The parameters of the four PI …

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Microstrip Diplexers With Double-Stub Bandpass Filters, M. Khalaj-Amirhosseini, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran Feb 2011

Microstrip Diplexers With Double-Stub Bandpass Filters, M. Khalaj-Amirhosseini, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran

Hossein Ameri Mahabadi

This paper presents a microstrip diplexer using two Double-Stub Band-Pass Filters (DS-BPFs), composed of several double-stubs connected to a main microstrip line. Each DS-BPF has a null at the center frequency of the other. Therefore, these types of filters are suitable for diplexers with two near frequencies. A diplexer at frequencies 5.875 and 6.225 GHz is designed, fabricated and measured. Measured results of the fabricated diplexer have a good agreement with the calculated results.

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Design And Implementation Of A Dsp Based Dual-Loop Capacitor Voltage Control Of The Z-Source Inverter, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire Feb 2011

Design And Implementation Of A Dsp Based Dual-Loop Capacitor Voltage Control Of The Z-Source Inverter, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

The Z-source inverter is a recently proposed single stage converter topology with buck-boost capabilities. This paper proposes a dual-loop capacitor voltage control, with outer voltage loop and inner current loop, of the Z-source inverter (ZSI). Both controller are designed based on a third order small signal model of the ZSI using the direct digital design method. Real-time control algorithm is implemented using DSP linked with MATLAB real time workshop (RTW) as rapid prototyping tool. The feasibility of the proposed dual loop control method has been verified by the simulation and experimental results.

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Design A Stable 14-To-20-Ghz Source, M. Moghavvemi, A. Attaran, Hossein Ameri Mahabadi Dec 2010

Design A Stable 14-To-20-Ghz Source, M. Moghavvemi, A. Attaran, Hossein Ameri Mahabadi

Hossein Ameri Mahabadi

Careful selection of key components and the use of straightforward multiplication schemes can be applied to the design of a low-noise frequency synthesizer for Ku-band signals to 20 GHz.

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Control Of A High-Performance Z-Source Inverter For Fuel Cell/Supercapacitor Hybrid Electric Vehicles, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire Dec 2010

Control Of A High-Performance Z-Source Inverter For Fuel Cell/Supercapacitor Hybrid Electric Vehicles, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

This paper presents a supercapacitor (SC) module connected in parallel with fuel cell (FC) stack to supply a high-performance Z-Source Inverter (HP-ZSI) feeding a three phase induction motor for hybrid electric vehicles applications. The supercapacitor is connected between the input diode and the bidirectional switch of the highperformance ZSI topology. The indirect field-oriented control (IFOC) method is used to control an induction motor speed during motoring and regenerative braking operations to produce the modulation index and a dual loop controller is used to control the Z-network capacitor voltage to produce the shoot-through duty ratio. MATLAB simulation results verified the validity …

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