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Hydroelectric power stations are a major source of electricity around the world; understanding their dynamics is crucial to achieving good performance. The electrical power generated is normally controlled by individual feedback loops on each unit. The reference input to the power loop is the grid frequency deviation from its set point, thus structuring an external frequency control loop. The book discusses practical and well-documented cases of modelling and controlling hydropower stations, focused on a pumped storage scheme based in Dinorwig, North Wales. These accounts are valuable to specialist control engineers who are working in this industry. In addition, the theoretical treatment of ...
"Noninvasive Cerebrovascular Diagnosis" is the newest definitive text on the current techniques used in assessing vascular disorders. Readers will receive authoritative information and will be guided through the establishment and accreditation of a vascular laboratory and introduced to the physics of diagnostic testing. Chapters, written by selected experts, comprehensively explain the use of ultrasound in diagnosing cerebrovascular, renovascular, visceral ischemia and peripheral arterial disease as well as venous disorders and deep abdominal vascular conditions. Noninvasive Vascular Diagnosis contains over 300 illustrations, many of them in colour. Due to the special sections which give clinical correlations, this book will be invaluable to physicians who treat vascular disorders, surgeons, cardiologists, vascular radiologists and the vascular laboratory staff.
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Now in its third edition, this is a bigger (more than 11,000 entries), updated version of the 1989 original covering the enormous kaleidoscope of changing political boundaries, names, and rulers of Africa. This exhaustive reference allows the user quickly to determine what happened in or to each country and when--changes of names, political systems, rulers, and so on. The term "state" is loosely defined to embrace, throughout the history of Africa, any area of land with recognized borders and evidence of a continuing governmental structure, almost always with a capital city. Entries give official name of country, dates during which it went by that name, location, capital, alternate names including cross-references to previous and later incarnations, and a list of rulers with dates of power when known. A new table details AIDS in the African states.
"This publication accompanies the exhibition Revealing the African Presence in Renaissance Europe, held at the Walters Art Museum from October 14, 2012, to January 21, 2013, and at the Princeton University Art Museum from February 16 to June 9, 2013."
With the recent shift of chemical fertilizers and pesticides to organic agriculture, the employment of microbes that perform significant beneficial functions for plants has been highlighted. This book presents timely discussion and coverage on the use of microbial formulations, which range from powdered or charcoal-based to solution and secondary metabolite-based bioformulations. Bioformulation development of biofertilizers and biopesticides coupled with the advantages of nanobiotechnology propose significant applications in the agricultural section including nanobiosensors, nanoherbicides, and smart transport systems for the regulated release of agrochemical. Moreover, the formulation of se...