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From short, easy one-night escapes suitable for the whole family, to hard-core mountain adventures that will test even the most experienced, competitive racers, the 34 trails of southern Africa's best multi-day trails and wilderness journeys featured in Free Wheeling cover the full spectrum of mountain bike tours on offer in South Africa and neighbouring countries. A guide and support vehicle accompanies most of the tours, meaning that someone else takes care of the logistics and you are left free to enjoy the best that mountain biking offers. Whether you want to ride with big game, along empty beaches, through verdant forest or across barren deserts you'll find a trail to suit, and there are also some specialist trails that are aimed at birders, gourmands and culture-vultures. As the waiting lists for the stage races grow (and with them the entry fees) touring offers an alternative way to get your dirt fix - an active holiday with a group of friends or family. After riding the inaugural Tour de Wilderness mountain bike tour, photojournalist Fiona McIntosh tried her hand at stage racing, completing the ABSA Cape Epic in 2007. She's now a social rider who looks forward to a soft bed, good meal and some fine wine after a hard day in the saddle.
The 14 clearly written articles included in this collection exemplify the best of sociological scholarship on drug and alcohol problems. The readings strike a balance between constructionist, epidemiological, and ethnographic approaches to the study of drinking, drug use, and related problems such as domestic violence, crime, and the spread of HIV/AIDS. Visit our website for sample chapters!
Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.
"A cross-national analysis of political recruitment and candidate selection in six Latin American countries: Argentina, Brazil, Chile, Colombia, Mexico and Uruguay. Provides typology and theoretical insights for other countries in the region and around the world"--Provided by publisher.
Power electronics, which is a rapidly growing area in terms of research and applications, uses modern electronics technology to convert electric power from one form to another, such as ac-dc, dc-dc, dc-ac, and ac-ac with a variable output magnitude and frequency. Power electronics has many applications in our every day life such as air-conditioners, electric cars, sub-way trains, motor drives, renewable energy sources and power supplies for computers. This book covers all aspects of switching devices, converter circuit topologies, control techniques, analytical methods and some examples of their applications.* 25% new content* Reorganized and revised into 8 sections comprising 43 chapters* Coverage of numerous applications, including uninterruptable power supplies and automotive electrical systems* New content in power generation and distribution, including solar power, fuel cells, wind turbines, and flexible transmission
An essential guide to safe and responsible four-wheel driving. Modern four-wheel drive vehicles are powerful and sophisticated machines, able to travel almost anywhere. Given their growing popularity with recreational drivers, there is an even more pressing need for adequate training. Even on sealed roads these vehicles require a different set of driving skills; off-road, the demands are many times greater. This second edition of the bestselling 4WD Driving Skills complements nationally recognised training courses and has been fully revised to include updated vehicle terminology, technology and recovery techniques. It explains the essential skills of four-wheel driving for every type of on- and off-road terrain, how to approach challenging situations, and what to do if things go wrong. It is a valuable reference for all four-wheel drive enthusiasts.
Since the first edition was published, new technologies have come up, especially in the area of convergence of Computing and Communications, accompanied by a lot of new technical terms. This second expanded and updated edition has been worked out to cope with this situation. The number of entries has been incremented by 35%. With about 159,000 entries, this dictionary offers a valuable guide to navigate through the entanglement of German and English terminology. The lexicographic concept (indication of the subject field for every term, short definitions, references to synonyms, antonyms, general and derivative terms) has been maintained, as well as the tabular layout.
Control in Power Electronics and Electrical Drives contains the proceedings of the Second International Federation of Automatic Control Symposium held in Düsseldorf, Germany, on October 3-5, 1977. The symposium provided a forum for discussing the effects of converter control on the design of electrical machines. Comprised of 102 chapters, this book begins by focusing on control systems employing electronic power converters, along with converter circuits and converter control procedures. The next section deals with the behavior of inverter-fed electrical machines and requirements imposed by converter operation. Topics covered include the status of power thyristors and rectifiers; the dynamic performance of converter-fed synchronous motors; and open loop control of a linear vernier reluctance motor in a stepping mode. Subsequent sections explore converter-fed alternating current and direct current drives; applications of controlled industrial drives; and solid-state energy conversion. A number of methods for analyzing power electronic circuits are discussed and illustrated. This monograph will be of interest to electronics and electrical engineers.