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The introductory chapter briefly presents the fundamental
topologies and operation of power inverters. The second chapter
contains a description of wavelet basis functions and sampling
theory with particular reference to the switching model of
inverters. Chapter three outlines the connection between the
non-uniform sampling theorem and wavelet functions to develop an
ideal sampling-reconstruction process to operate an inverter for
obtaining its optimal performances. The scale based linearly
combined basis functions are developed in chapter four in order to
successfully operate single phase wavelet modulated inverters.
Chapter four also contains the development of the non-dyadic type
multiresolution analysis, that are responsible for sampling and
recontruction of three continuous time reference modulating signals
for three phase inverters. The performances of single phase wavelet
modulated inverters for static, dynamic and non-linear loads are
presented in chapter five, while chapter six contains the
simulation and experimental performances of three phase wavelet
modulated voltage source inverters for different loads at various
operating conditions. This book presents the latest technology in
the advancing power electronics field.
Arsenic, a deadly toxic element, is widely distributed in
freshwater systems with an average concentration of approximately
1.7 g/L, predominantly as inorganic forms, from natural and
anthropogenic sources. Phytoremediation, a plant-based eco-friendly
technology, is receiving increasing attention, and aquatic plants
can be used for the remediation of arsenic-contaminated water.
Water hyacinth (Eichhornia crassipes), duckweeds (Lemna spp.,
Spirodela polyrhiza), water fern (Azolla spp.), hydrilla (Hydrilla
verticillata) and watercress (Lepidium sativum) have been studied
to assess their potential for arsenic phytoremediation. Arsenic is
mainly taken up by aquatic plants through the phosphate uptake
pathway, however, physico-chemical adsorption of arsenate on
aquatic plant surfaces also contributes significantly in arsenic
accumulation in the plants. Phosphate and iron influence arsenate
uptake, while these chemicals do not influence arsenite, MMAA and
DMAA uptake in aquatic plants. From my studies, I proposed that
aquatic floating macrophytes such as duckweed (Spirodella
polyrhiza) and water fern (Azolla pinnata) can be used for the
remediation of arsenic from freshwater."
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