Control of Surge in Centrifugal Compressors by Active Magnetic Bearings

Control of Surge in Centrifugal Compressors by Active Magnetic Bearings

Surge Control of Active-magnetic-bearing-suspended Centrifugal Compressors sets out the fundamentals of integrating active magnetic bearing (AMB) rotor suspension technology in compressor systems, and describes how this relatively new bearing technology can be employed in active control of compressor surge initiation. The authors provide a self-contained and comprehensive review of rotordynamics and the fundamentals of AMB technology. The active stabilization of compressor surge employing AMBs in a machine is fully explored, from modeling of instability and controller design, to the implementation and experimental testing of the control algorithm in a specially-constructed, industrial-size centrifugal compression system. The results of these tests demonstrate the great potential of the new surge control method suggested in this text. This book will be useful for engineers in industries that involve turbocompressors and magnetic bearings, as well as for researchers and graduate students in the field of applied control. Whatever their level of experience, engineers working in the fields of turbomachinery, magnetic bearings, rotordynamics and controls will find the material in this book absorbing as all these important aspects of engineering are integrated to create a multi-disciplinary solution to a real-life industrial problem and the book is a suitable introduction to the area for newcomers.

Control of Surge in Centrifugal Compressors by Active Magnetic Bearings

Refusing to be a Man

Refusing to be a Man

Since its original publication in 1989, Refusing to be a Man has been acclaimed as a classic and widely cited in gender studies literature. In 13 eloquent essays, Stoltenberg articulates the first fully argued liberation theory for men that will also liberate women. He argues that male sexual identity is entirely a political and ethical construction whose advantages grow out of injustice. His thesis is, however, ultimately one of hope – that precisely because masculinity is so constructed, it is possible to refuse it, to act against it and to change. A new introduction by the author discusses the roots of his work in the American civil rights and radical feminist movements and distinguishes it from the anti-feminist philosophies underlying the recent tide of reactionary mens movements.

Refusing to be a Man

A Course on Elation Quadrangles

A Course on Elation Quadrangles

The notion of elation generalized quadrangle is a natural generalization to the theory of generalized quadrangles of the important notion of translation planes in the theory of projective planes. Almost any known class of finite generalized quadrangles can be constructed from a suitable class of elation quadrangles. In this book the author considers several aspects of the theory of elation generalized quadrangles. Special attention is given to local Moufang conditions on the foundational level, exploring, for instance, Knarr’s question from the 1990s concerning the very notion of elation quadrangles. All the known results on Kantor’s prime power conjecture for finite elation quadrangles are gathered, some of them published here for the first time. The structural theory of elation quadrangles and their groups is heavily emphasized. Other related topics, such as $p$-modular cohomology, Heisenberg groups, and existence problems for certain translation nets, are briefly touched. This book starts from scratch and is essentially self-contained. Many alternative proofs are given for known theorems. This course contains dozens of exercises at various levels, from very easy to rather difficult, and will stimulate undergraduate and graduate students to enter the fascinating and rich world of elation quadrangles. More accomplished mathematicians will find the final chapters especially challenging. A publication of the European Mathematical Society (EMS). Distributed within the Americas by the American Mathematical Society.

A Course on Elation Quadrangles

Microeconomics

Microeconomics

Microeconomics covers core microeconomic principles using a clear and carefully constructed learning framework. The text provides a solid foundation in microeconomic analysis, using mathematical techniques where appropriate. Students also learn how to apply analytical techniques to a range of economic problems. The text introduces the core concepts and techniques in early chapters, and builds upon these fundamentals throughout later chapters. Each chapter contains comprehensive problem sets and exercises, enabling students to put the theories they have learned into practice. In addition, the book is supported by a companion web site containing supplementary resources for lecturers and students. For lecturers these include PowerPoint slides and answers to the book’s many exercises and question sets. Features for students include PowerPoint material designed to aid understanding of graphical arguments used in the text and model answers to some of the exercises.

Microeconomics

Economic Growth and the Environment

Economic Growth and the Environment

Economic Growth and the Environment explores the debate on how to reconcile economic growth with protection of the natural environment, and the closely related discussion on whether an increasing scarcity of natural resources will eventually force economic growth to cease. The debate focuses on whether environmental policies will benefit the economy or not, and is divided into growth optimists and growth pessimists. In general, economists have been optimistic and have pointed to the possibilities of technological progress and substitution, yet they also acknowledge that natural resources and environmental concern do restrict economic growth. The difficulty lies in quantifying the constraint to economic growth. Modern growth economists have constructed models to examine to what extent ‘growth pessimism’ is theoretically warranted. This book provides an introduction to some of these models, brings together the discussion between growth optimists and pessimists, and presents the theory behind their arguments. It aims to present models where both sides can meet and where both are able to derive expected results with the parameter values that they deem appropriate. From there, the discussions can turn to the empirical observations about these parameters.

Economic Growth and the Environment

Fuzzy Probabilities New Approach and Applications

Fuzzy Probabilities New Approach and Applications

In probability and statistics we often have to estimate probabilities and parameters in probability distributions using a random sample. Instead of using a point estimate calculated from the data we propose using fuzzy numbers which are constructed from a set of confidence intervals. In probability calculations we apply constrained fuzzy arithmetic because probabilities must add to one. Fuzzy random variables have fuzzy distributions. A fuzzy normal random variable has the normal distribution with fuzzy number mean and variance. Applications are to queuing theory, Markov chains, inventory control, decision theory and reliability theory.

Fuzzy Probabilities New Approach and Applications

Practical Design, Construction and Operation of Food Facilities

Practical Design, Construction and Operation of Food Facilities

Around the world concerns about cost, efficiency, and safety – employee, product, process and consumer — have led to changes in the way food plants are planned, constructed and evaluated. From initiation of major capital requests to legal design requirements to project management and plant operations, food engineers and scientists must understand the myriad of requirements and responsibilities of successful food facilities. J. Peter Clark provides that guidance in this complete volume.

Practical Design, Construction and Operation of Food Facilities