This book provides a theoretical discussion of pulse width modulation (PWM) in power electronic inverters. Pulse width modulation is widely used for the frequency control of speed of ac motors, the design of uninterruptible power supplies (UPS) as well as the integration of renewable energy sources into existing power grid systems. PWM technique is based on approximation of sinusoidal waveforms by sequences (trains) of rectangular pulses whose widths are properly modulated. This width-modulation results in the suppression of low order harmonics at the expense of amplification of high order harmonics which are suppressed by energy-storage elements in load circuits. The discussion covers various PWM techniques with a focus on the optimal time-domain PWM techniques proposed by the authors.
In Lahore, for over twelve years Rukhsar Ahmeds search for her missing father, a major in Pakistan army had been stone-walled. An anonymous call from India sets her and her beau Aman Khan Bux on an emotional journey of tragic discoveries of how her family and ancestry was directly affected by the historical events; uncovering of lies her countrys military and civilian rulers told to their people about the numerous wars fought between Pakistan and India which was creating hatred. Her journey also uncovers a sinister plot by few Generals in Pak army which could plunge the Indian sub-continent into a catastrophic nuclear war. While learning the truth about the history of four major wars and numerous small skirmishes and wars between India and Pakistan, she and her beau must help Prakash Rohatgi, her new found Indian friend stop the over-zealous Generals lest her beloved country is blown into extinction and millions are killed on either side of Indo-Pak border. This is story of Rukhsars journey of overcoming misconceptions about her countrys arch enemy India and her love for it; about fear psychosis replaced by hope, and enmity replaced with partnership. This is the story of Humans!
Multifrequency Electromagnetic Data Interpretation for Subsurface Characterization focuses on the development and application of electromagnetic measurement methodologies and their interpretation techniques for subsurface characterization. The book guides readers on how to characterize and understand materials using electromagnetic measurements, including dielectric permittivity, resistivity and conductivity measurements. This reference will be useful for subsurface engineers, petrophysicists, subsurface data analysts, geophysicists, hydrogeologists, and geoscientists who want to know how to develop tools and techniques of electromagnetic measurements and interpretation for subsurface characterization. - Includes case studies to add additional color to the presented content - Provides codes for the mechanistic modeling of multi-frequency conductivity and relative permittivity of porous geomaterials - Presents detailed descriptions of multifrequency electromagnetic data interpretation models and inversion algorithm
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