Dhaval Patel - Academia.edu (original) (raw)

Papers by Dhaval Patel

Research paper thumbnail of Impact of wind turbine generators on network resonance and harmonic distortion

Distributed generators (DGs) are being increasingly connected at medium voltage level distributio... more Distributed generators (DGs) are being increasingly connected at medium voltage level distribution networks. It is likely that different types of DGs, ie wind turbine generators (WTGs), photovoltaic solar systems, etc, may be connected on the same feeder. Most of the modern DGs are ...

Research paper thumbnail of Three-Dimensional Flux Vector Modulation of Four-Leg Sine-Wave Output Inverters

IEEE Transactions on Industrial Electronics, 2010

The time integral of the output voltage vector of a three-phase inverter is often termed the inve... more The time integral of the output voltage vector of a three-phase inverter is often termed the inverter flux vector. This paper addresses the control of a three-phase four-leg sine-wave output inverter having an LC filter at its output, by controlling the flux vector in three dimensions. Flux vector control has the property that an output filter resonance is actively damped by an output voltage control loop alone. Furthermore, an inverter switching action inherently regulates the output voltage rapidly against dc-bus voltage variations. The flux vector control of sine-wave output inverters finds several applications in three-phase four-wire systems. This paper presents a flux modulation method for threephase four-leg inverters feeding unbalanced and nonlinear loads. All the necessary steps for the digital implementation of the flux modulator are presented. The switching behavior of the modulator has been evaluated, which is useful for the variable fundamental frequency applications of the inverters. To provide experimental validation, the modulator is implemented as a part of the control system for a stand-alone three-phase four-leg inverter with an LC filter at its output. Control system details are also provided. Experimental results indicate the effectiveness of the modulator and control system in providing balanced voltages at the output of the LC filter even under highly unbalanced conditions with nonlinear loads. The resonance damping and voltage regulation properties of the modulator are also apparent from the experimental results.

Research paper thumbnail of Transient modeling and analysis of induction motors with position effects in stator turn faults

Page 1. Transient Modeling and Analysis of Induction Motors with Position Effects in Stator Turn ... more Page 1. Transient Modeling and Analysis of Induction Motors with Position Effects in Stator Turn Faults Dhaval C. Patel, and MC Chandorkar Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400076, INDIA. ...

Research paper thumbnail of Control of four-leg sinewave output inverter using flux vector modulation

Research paper thumbnail of Understanding Barriers to Preventive Health Actions for Occupational Noise-Induced Hearing Loss

Journal of Health Communication, 2001

The current status of studies of online shopping attitudes and behavior is investigated through a... more The current status of studies of online shopping attitudes and behavior is investigated through an analysis of 35 empirical articles found in nine primary Information Systems (IS) journals and three major IS conference proceedings. A taxonomy is developed based on our analysis. A conceptual model of online shopping is presented and discussed in light of existing empirical studies. Areas for further research are discussed.

Research paper thumbnail of Conversations among Coal Miners in a Campaign to Promote Hearing Protection

Journal of Applied Communication Research, 2009

The current status of studies of online shopping attitudes and behavior is investigated through a... more The current status of studies of online shopping attitudes and behavior is investigated through an analysis of 35 empirical articles found in nine primary Information Systems (IS) journals and three major IS conference proceedings. A taxonomy is developed based on our analysis. A conceptual model of online shopping is presented and discussed in light of existing empirical studies. Areas for further research are discussed.

Research paper thumbnail of Using the Extended Parallel Process Model to Prevent Noise-Induced Hearing Loss Among Coal Miners in Appalachia

Health Education & Behavior, 2004

Occupational noise-induced hearing loss is the second most self-reported occupational illness or ... more Occupational noise-induced hearing loss is the second most self-reported occupational illness or injury in the United States. Among coal miners, more than 90% of the population reports a hearing deficit by age 55. In this formative evaluation, focus groups were conducted with coal miners in Appalachia to ascertain whether miners perceive hearing loss as a major health risk and if so, what would motivate the consistent wearing of hearing protection devices (HPDs). The theoretical framework of the Extended Parallel Process Model was used to identify the miners' knowledge, attitudes, beliefs, and current behaviors regarding hearing protection. Focus group participants had strong perceived severity and varying levels of perceived susceptibility to hearing loss. Various barriers significantly reduced the self-efficacy and the response efficacy of using hearing protection.

Research paper thumbnail of Using persuasive messages to encourage voluntary hearing protection among coal miners

Journal of Safety Research, 2005

Research paper thumbnail of Transcatheter Closure of Ruptured Sinus of Valsalva Aneurysm and Secundum Atrial Septal Defect with Limited Inferior Rim

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 2008

We report a case of a 33-year-old man with Down syndrome and ruptured sinus of Valsalva aneurysm ... more We report a case of a 33-year-old man with Down syndrome and ruptured sinus of Valsalva aneurysm (SOVA) plus large ostium secundum atrial septal defect (ASD) with attenuated inferior rim. He underwent successful transcatheter closure of both defects at two separate procedures with transesophageal echocardiography (TEE) guidance. The combination of these two procedures has not been previously reported. Transgastric echocardiographic views which mimic transthoracic subcostal echocardiographic views provide high quality useful images of the anatomy, hemodynamics, and device placement.

Research paper thumbnail of Double Aortic Arch and D-Transposition of the Great Arteries

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 2007

We present a rare case of D-transposition of the great arteries (D-TGA) and double aortic arch (D... more We present a rare case of D-transposition of the great arteries (D-TGA) and double aortic arch (DAA). The anatomy was prospectively and preoperatively diagnosed by echocardiography and confirmed by ultra-fast computed tomography. The patient underwent successful arterial switch operation and division of the vascular ring at a single procedure.

Research paper thumbnail of Understanding Online Shopping Behaviour of Indian Shoppers 1

The growth rate of India's e-commerce industry is fascinating. It was reported as 88% in 2013 whi... more The growth rate of India's e-commerce industry is fascinating. It was reported as 88% in 2013 which is a clear contrast picture of the slower economic growth of India. The rising inflation rate in recent years has not slipped away the performance of online shopping industry in India. Companies are using the internet to put across and commune the information. Simultaneously it helps the companies to give an idea about their products and instantly getting the feedback of customer's fulfilment to get stimulated turnover for future. The primary objective of the current study is to understand the online buying behaviour of consumers in India. It has also made an attempt to get information about the scope of improvement in online shopping website.

Research paper thumbnail of Impact of wind turbine generators on network resonance and harmonic distortion

Distributed generators (DGs) are being increasingly connected at medium voltage level distributio... more Distributed generators (DGs) are being increasingly connected at medium voltage level distribution networks. It is likely that different types of DGs, ie wind turbine generators (WTGs), photovoltaic solar systems, etc, may be connected on the same feeder. Most of the modern DGs are ...

Research paper thumbnail of Three-Dimensional Flux Vector Modulation of Four-Leg Sine-Wave Output Inverters

IEEE Transactions on Industrial Electronics, 2010

The time integral of the output voltage vector of a three-phase inverter is often termed the inve... more The time integral of the output voltage vector of a three-phase inverter is often termed the inverter flux vector. This paper addresses the control of a three-phase four-leg sine-wave output inverter having an LC filter at its output, by controlling the flux vector in three dimensions. Flux vector control has the property that an output filter resonance is actively damped by an output voltage control loop alone. Furthermore, an inverter switching action inherently regulates the output voltage rapidly against dc-bus voltage variations. The flux vector control of sine-wave output inverters finds several applications in three-phase four-wire systems. This paper presents a flux modulation method for threephase four-leg inverters feeding unbalanced and nonlinear loads. All the necessary steps for the digital implementation of the flux modulator are presented. The switching behavior of the modulator has been evaluated, which is useful for the variable fundamental frequency applications of the inverters. To provide experimental validation, the modulator is implemented as a part of the control system for a stand-alone three-phase four-leg inverter with an LC filter at its output. Control system details are also provided. Experimental results indicate the effectiveness of the modulator and control system in providing balanced voltages at the output of the LC filter even under highly unbalanced conditions with nonlinear loads. The resonance damping and voltage regulation properties of the modulator are also apparent from the experimental results.

Research paper thumbnail of Transient modeling and analysis of induction motors with position effects in stator turn faults

Page 1. Transient Modeling and Analysis of Induction Motors with Position Effects in Stator Turn ... more Page 1. Transient Modeling and Analysis of Induction Motors with Position Effects in Stator Turn Faults Dhaval C. Patel, and MC Chandorkar Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400076, INDIA. ...

Research paper thumbnail of Control of four-leg sinewave output inverter using flux vector modulation

Research paper thumbnail of Understanding Barriers to Preventive Health Actions for Occupational Noise-Induced Hearing Loss

Journal of Health Communication, 2001

The current status of studies of online shopping attitudes and behavior is investigated through a... more The current status of studies of online shopping attitudes and behavior is investigated through an analysis of 35 empirical articles found in nine primary Information Systems (IS) journals and three major IS conference proceedings. A taxonomy is developed based on our analysis. A conceptual model of online shopping is presented and discussed in light of existing empirical studies. Areas for further research are discussed.

Research paper thumbnail of Conversations among Coal Miners in a Campaign to Promote Hearing Protection

Journal of Applied Communication Research, 2009

The current status of studies of online shopping attitudes and behavior is investigated through a... more The current status of studies of online shopping attitudes and behavior is investigated through an analysis of 35 empirical articles found in nine primary Information Systems (IS) journals and three major IS conference proceedings. A taxonomy is developed based on our analysis. A conceptual model of online shopping is presented and discussed in light of existing empirical studies. Areas for further research are discussed.

Research paper thumbnail of Using the Extended Parallel Process Model to Prevent Noise-Induced Hearing Loss Among Coal Miners in Appalachia

Health Education & Behavior, 2004

Occupational noise-induced hearing loss is the second most self-reported occupational illness or ... more Occupational noise-induced hearing loss is the second most self-reported occupational illness or injury in the United States. Among coal miners, more than 90% of the population reports a hearing deficit by age 55. In this formative evaluation, focus groups were conducted with coal miners in Appalachia to ascertain whether miners perceive hearing loss as a major health risk and if so, what would motivate the consistent wearing of hearing protection devices (HPDs). The theoretical framework of the Extended Parallel Process Model was used to identify the miners' knowledge, attitudes, beliefs, and current behaviors regarding hearing protection. Focus group participants had strong perceived severity and varying levels of perceived susceptibility to hearing loss. Various barriers significantly reduced the self-efficacy and the response efficacy of using hearing protection.

Research paper thumbnail of Using persuasive messages to encourage voluntary hearing protection among coal miners

Journal of Safety Research, 2005

Research paper thumbnail of Transcatheter Closure of Ruptured Sinus of Valsalva Aneurysm and Secundum Atrial Septal Defect with Limited Inferior Rim

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 2008

We report a case of a 33-year-old man with Down syndrome and ruptured sinus of Valsalva aneurysm ... more We report a case of a 33-year-old man with Down syndrome and ruptured sinus of Valsalva aneurysm (SOVA) plus large ostium secundum atrial septal defect (ASD) with attenuated inferior rim. He underwent successful transcatheter closure of both defects at two separate procedures with transesophageal echocardiography (TEE) guidance. The combination of these two procedures has not been previously reported. Transgastric echocardiographic views which mimic transthoracic subcostal echocardiographic views provide high quality useful images of the anatomy, hemodynamics, and device placement.

Research paper thumbnail of Double Aortic Arch and D-Transposition of the Great Arteries

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 2007

We present a rare case of D-transposition of the great arteries (D-TGA) and double aortic arch (D... more We present a rare case of D-transposition of the great arteries (D-TGA) and double aortic arch (DAA). The anatomy was prospectively and preoperatively diagnosed by echocardiography and confirmed by ultra-fast computed tomography. The patient underwent successful arterial switch operation and division of the vascular ring at a single procedure.

Research paper thumbnail of Understanding Online Shopping Behaviour of Indian Shoppers 1

The growth rate of India's e-commerce industry is fascinating. It was reported as 88% in 2013 whi... more The growth rate of India's e-commerce industry is fascinating. It was reported as 88% in 2013 which is a clear contrast picture of the slower economic growth of India. The rising inflation rate in recent years has not slipped away the performance of online shopping industry in India. Companies are using the internet to put across and commune the information. Simultaneously it helps the companies to give an idea about their products and instantly getting the feedback of customer's fulfilment to get stimulated turnover for future. The primary objective of the current study is to understand the online buying behaviour of consumers in India. It has also made an attempt to get information about the scope of improvement in online shopping website.