Overall structure of electrical power system is in the process of changing. For incremental
growth, it is moving away from fossil fuels - major source of energy in the world today - to
renewable energy resources that are more environmentally friendly and sustainable .
Power electronic converters (PECs) are static devices, without any movable parts, that convert electric energy of one set of properties into electric energy of another, different set of properties. The properties that are changed by the action of the converter are one or more of the following: number of phases, frequency, and voltage rms (or average, in the DC case) value. Thus any power electronic converter is essentially a transformer in a broad sense. Action of a power electronic converter is illustrated in Fig....
This book covers the recent development and progress of the wind energy conversion system. The chapters are contributed by prominent researchers in the field of wind energy and cover grid integration issues, modern control theories applied in wind energy conversion system, and dynamic and transient stability studies.
It’s fair to say that the array of commercially available vehicles is beginning to catch
up with the technological advances made available by science during the past decade.
With a lot of eff ort being employed by manufactures to provide cars with advanced
networking capabilities, we can mainly distinguish the connectivity topologies in two
very diff erent groups: the Vehicular Ad-hoc Networks (VANETs), which make use of
the scientifi c contributions provided by the Mobile Ad-Hoc Networks (MANETs), and
the Vehicle Infrastructure Integration (VII) based networks....
Water contamination weakens or destroys natural
ecosystems that support human health, food production,
and biodiversity. Studies have estimated that the value of
ecosystem services is double the gross national product of
the global economy, and the role of freshwater ecosystems
in purifying water and assimilating wastes has been
valued at US$ 400 billion (2008$) (Costanza et al. 1997).
Freshwater ecosystems are among the most degraded on
the planet, and have suffered proportionately greater species
and habitat losses than terrestrial or marine ecosystems
(Revenga et al. 2000).
Wireless sensor networks promise an unprecedented fine-grained interface
between the virtual and physical worlds. They are one of the most rapidly developing
new information technologies, with applications in a wide range of fields
including industrial process control, security and surveillance, environmental
sensing, and structural health monitoring. This book is motivated by the urgent
need to provide a comprehensive and organized survey of the field.
Mammalian adenylate cyclases are predicted to possess
complex topologies, comprising two cassettes of six trans-membrane-spanningmotifs followedbyacytosolic, catalytic
ATP-binding domain. Recent studies have begun to provide
insights on the tertiary assembly of these proteins; crystal-lographic analysis has revealed that the two cytosolic
domains dimerize to forma catalytic core, whilemore recent
biochemical and cell biological analysis shows that the two
transmembrane cassettes also associate to facilitate the
functional assembly and trackingof the enzyme. ...
With technology advancements in semiconductor devices such as insulated gate
bipolar transistors (IGBTs) and gate commutated thyristors (GCTs), modern highpower
medium voltage (MV) drives are increasingly used in petrochemical, mining,
steel and metals, transportation and other industries to conserve electric energy,
increase productivity and improve product quality.
Although research and development of the medium voltage (2.3 KV to 13.8 KV)
drive in the 1-MW to 100-MW range are continuously growing, books dedicated to
this technology seem unavailable.