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Zentrifugalpumpen werden in den verschiedensten Bereichen eingesetzt - etwa in städtischen Versorgungssystemen zum Pumpen von Wasser oder in Maschinen zum Pumpen von Öl -, denn sie sind zuverlässig und dabei moderat im Kosten- und Wartungsaufwand. Der Autor dieses Buches kann auf Erfahrungen aus langjähriger Tätigkeit in der Industrie zurückgreifen. Er erklärt Ihnen Konstruktion und Analyse der wichtigsten Pumpensysteme. (11/00)
Hydrodynamics of Pumps is a reference for pump experts and a textbook for advanced students. It examines the fluid dynamics of liquid turbomachines, particularly pumps, focusing on special problems and design issues associated with the flow of liquid through a rotating machine. There are two characteristics of a liquid that lead to problems and cause a significantly different set of concerns than those in gas turbines. These are the potential for cavitation and the high density of liquids, which enhances the possibility of damaging, unsteady flows and forces. The book begins with an introduction to the subject, including cavitation, unsteady flows and turbomachinery, basic pump design and performance principles. Chapter topics include flow features, cavitation parameters and inception, bubble dynamics, cavitation effects on pump performance, and unsteady flows and vibration in pumps - discussed in the three final chapters. The book is richly illustrated and includes many practical examples.
Paolo Bacigalupi's debut collection demonstrates the power and reach of the science fiction short story. Social criticism, political parable, and environmental advocacy lie at the center of Paolo's work. Each of the stories herein is at once a warning, and a celebration of the tragic comedy of the human experience. The eleven stories in Pump Six represent the best Paolo's work, including the Hugo nominee "Yellow Card Man," the nebula and Hugo nominated story "The People of Sand and Slag," and the Sturgeon Award-winning story "The Calorie Man."
Leviathan and the Air-Pump examines the conflicts over the value and propriety of experimental methods between two major seventeenth-century thinkers: Thomas Hobbes, author of the political treatise Leviathan and vehement critic of systematic experimentation in natural philosophy, and Robert Boyle, mechanical philosopher and owner of the newly invented air-pump. The issues at stake in their disputes ranged from the physical integrity of the air-pump to the intellectual integrity of the knowledge it might yield. Both Boyle and Hobbes were looking for ways of establishing knowledge that did not decay into ad hominem attacks and political division. Boyle proposed the experiment as cure. He argued that facts should be manufactured by machines like the air-pump so that gentlemen could witness the experiments and produce knowledge that everyone agreed on. Hobbes, by contrast, looked for natural law and viewed experiments as the artificial, unreliable products of an exclusive guild. The new approaches taken in Leviathan and the Air-Pump have been enormously influential on historical studies of science. Shapin and Schaffer found a moment of scientific revolution and showed how key scientific givens--facts, interpretations, experiment, truth--were fundamental to a new political order. Shapin and Schaffer were also innovative in their ethnographic approach. Attempting to understand the work habits, rituals, and social structures of a remote, unfamiliar group, they argued that politics were tied up in what scientists did, rather than what they said. Steven Shapin and Simon Schaffer use the confrontation between Hobbes and Boyle as a way of understanding what was at stake in the early history of scientific experimentation. They describe the protagonists' divergent views of natural knowledge, and situate the Hobbes-Boyle disputes within contemporary debates over the role of intellectuals in public life and the problems of social order and assent in Restoration England. In a new introduction, the authors describe how science and its social context were understood when this book was first published, and how the study of the history of science has changed since then.
Oil on the Brain is a smart, surprisingly funny account of the oil industry—the people, economies, and pipelines that bring us petroleum, brilliantly illuminating a world we encounter every day. Americans buy ten thousand gallons of gasoline a second, without giving it much of a thought. Where does all this gas come from? Lisa Margonelli’s desire to learn took her on a one-hundred thousand mile journey from her local gas station to oil fields half a world away. In search of the truth behind the myths, she wriggled her way into some of the most off-limits places on earth: the Strategic Petroleum Reserve, the New York Mercantile Exchange’s crude oil market, oil fields from Venezuela, to Texas, to Chad, and even an Iranian oil platform where the United States fought a forgotten one-day battle. In a story by turns surreal and alarming, Margonelli meets lonely workers on a Texas drilling rig, an oil analyst who almost gave birth on the NYMEX trading floor, Chadian villagers who are said to wander the oil fields in the guise of lions, a Nigerian warlord who changed the world price of oil with a single cell phone call, and Shanghai bureaucrats who dream of creating a new Detroit. Deftly piecing together the mammoth economy of oil, Margonelli finds a series of stark warning signs for American drivers.
A practical, humorous guide to breastfeeding while employed: “Having such helpful tips and tricks . . . will be a godsend to the back-to-work mom.” —Publishers Weekly (starred review) Meet the frenemy of every new mother who works outside the home: the breast pump. This is the first book to give women what they need to know so they can successfully tune out the unhelpful, judgmental comments and self-doubts that spring up during this challenging time. Jessica Shortall shares the nitty-gritty basics of surviving the working world as a breastfeeding mom, offering a road map for negotiating the pumping schedule with colleagues, navigating business travel, and problem-solving when forced to pump in less-than-desirable locales. Drawing on the war stories, hacks, and humor of working moms, and on her own experience from her demanding job and travel in developing countries, she gives women moral support for dealing with the stress and guilt that come with juggling working and breastfeeding. As she tells the reader in her witty, inspiring manifesto: Your worth as a mother is not measured in ounces.