This work, consisting of expository articles as well as research papers, highlights recent developments in nonlinear analysis and differential equations. The material is largely an outgrowth of autumn school courses and seminars held at the University of Lisbon and has been thoroughly refereed.

Several topics in ordinary differential equations and partial differential equations are the focus of key articles, including:

* periodic solutions of systems with p-Laplacian type operators (J. Mawhin)

* bifurcation in variational inequalities (K. Schmitt)

* a geometric approach to dynamical systems in the plane via twist theorems (R. Ortega)

* asymptotic behavior and periodic solutions for Navier--Stokes equations (E. Feireisl)

* mechanics on Riemannian manifolds (W. Oliva)

* techniques of lower and upper solutions for ODEs (C. De Coster and P. Habets)

A number of related subjects dealing with properties of solutions, e.g., bifurcations, symmetries, nonlinear oscillations, are treated in other articles.

This volume reflects rich and varied fields of research and will be a useful resource for mathematicians and graduate students in the ODE and PDE community.

This book provides users, pump manufactures, engineers, researchers and students with extensive information about pump's behavior in reverse operation. It reports on cutting-edge methods for selecting the proper PAT and improving PAT's efficiency, discusses PAT's reliability, economic issues and environmental impact as well. The book describes in detail electromechanical equipment of PAT systems, their installation and operation, and gives important practical insight into the use of PAT in water transmission and distribution systems, as part of thermal power plants and cooling systems, in oil distribution systems and other systems as well. It reports on different types on PAT control modes as well as on numerical methods useful for PAT analysis and implementation. All in all, the book represents a comprehensive practice-oriented reference-guide to design engineers, as well as PAT general users and manufactures. It also provides researchers with extensive technical information on the use of PAT thus fostering new discussions and ideas to improve current methods and cope with future challenges.

iPolitics provides a current analysis of new media's effect on politics. Politicians rely on Twitter, Facebook, and YouTube to exercise political power. Citizens around the world also use these tools to vent political frustrations, join political groups, and organize revolutions. Political activists blog to promote candidates, solicit and coordinate financial contributions, and provide opportunities for volunteers. iPolitics describes the ways in which new media innovations change how politicians and citizens engage the political arena. Most importantly, the volume emphasizes the implications of these changes for the promotion of democratic ideals. Among other things, contributors to this volume analyze whether the public's political knowledge has increased or decreased in the new media era, the role television still plays in the information universe, the effect bloggers have had on the debate and outcome of healthcare reform, and the manner in which political leaders should navigate the new media environment. While the majority of contributors examine new media and politics in the United States, the volume also provides a unique comparative perspective on this relationship using cases from abroad.

Examines the recent rise in the United States' use of preventive force More so than in the past, the US is now embracing the logic of preventive force: using military force to counter potential threats around the globe before they have fully materialized. While popular with individuals who seek to avoid too many "boots on the ground," preventive force is controversial because of its potential for unnecessary collateral damage. Who decides what threats are 'imminent'? Is there an international legal basis to kill or harm individuals who have a connection to that threat? Do the benefits of preventive force justify the costs? And, perhaps most importantly, is the US setting a dangerous international precedent? In Preventive Force, editors Kerstin Fisk and Jennifer Ramos bring together legal scholars, political scientists, international relations scholars, and prominent defense specialists to examine these questions, whether in the context of full-scale preventive war or preventive drone strikes. In particular, the volume highlights preventive drones strikes, as they mark a complete transformation of how the US understands international norms regarding the use of force, and could potentially lead to a 'slippery slope' for the US and other nations in terms of engaging in preventive warfare as a matter of course. A comprehensive resource that speaks to the contours of preventive force as a security strategy as well as to the practical, legal, and ethical considerations of its implementation, Preventive Force is a useful guide for political scientists, international relations scholars, and policymakers who seek a thorough and current overview of this essential topic.

Examines the recent rise in the United States' use of preventive force More so than in the past, the US is now embracing the logic of preventive force: using military force to counter potential threats around the globe before they have fully materialized. While popular with individuals who seek to avoid too many "boots on the ground," preventive force is controversial because of its potential for unnecessary collateral damage. Who decides what threats are 'imminent'? Is there an international legal basis to kill or harm individuals who have a connection to that threat? Do the benefits of preventive force justify the costs? And, perhaps most importantly, is the US setting a dangerous international precedent? In Preventive Force, editors Kerstin Fisk and Jennifer Ramos bring together legal scholars, political scientists, international relations scholars, and prominent defense specialists to examine these questions, whether in the context of full-scale preventive war or preventive drone strikes. In particular, the volume highlights preventive drones strikes, as they mark a complete transformation of how the US understands international norms regarding the use of force, and could potentially lead to a 'slippery slope' for the US and other nations in terms of engaging in preventive warfare as a matter of course. A comprehensive resource that speaks to the contours of preventive force as a security strategy as well as to the practical, legal, and ethical considerations of its implementation, Preventive Force is a useful guide for political scientists, international relations scholars, and policymakers who seek a thorough and current overview of this essential topic.

This book provides users, pump manufactures, engineers, researchers and students with extensive information about pump's behavior in reverse operation. It reports on cutting-edge methods for selecting the proper PAT and improving PAT's efficiency, discusses PAT's reliability, economic issues and environmental impact as well. The book describes in detail electromechanical equipment of PAT systems, their installation and operation, and gives important practical insight into the use of PAT in water transmission and distribution systems, as part of thermal power plants and cooling systems, in oil distribution systems and other systems as well. It reports on different types on PAT control modes as well as on numerical methods useful for PAT analysis and implementation. All in all, the book represents a comprehensive practice-oriented reference-guide to design engineers, as well as PAT general users and manufactures. It also provides researchers with extensive technical information on the use of PAT thus fostering new discussions and ideas to improve current methods and cope with future challenges.

This work, consisting of expository articles as well as research papers, highlights recent developments in nonlinear analysis and differential equations. The material is largely an outgrowth of autumn school courses and seminars held at the University of Lisbon and has been thoroughly refereed. Several topics in ordinary differential equations and partial differential equations are the focus of key articles, including: * periodic solutions of systems with p-Laplacian type operators (J. Mawhin) * bifurcation in variational inequalities (K. Schmitt) * a geometric approach to dynamical systems in the plane via twist theorems (R. Ortega) * asymptotic behavior and periodic solutions for Navier--Stokes equations (E. Feireisl) * mechanics on Riemannian manifolds (W. Oliva) * techniques of lower and upper solutions for ODEs (C. De Coster and P. Habets) A number of related subjects dealing with properties of solutions, e.g., bifurcations, symmetries, nonlinear oscillations, are treated in other articles. This volume reflects rich and varied fields of research and will be a useful resource for mathematicians and graduate students in the ODE and PDE community.

DYNAMICS REPORTED reports on recent developments in dynamical systems. Dynamical systems of course originated from ordinary differential equations. Today, dynamical systems cover a much larger area, including dynamical processes described by functional and integral equations, by partial and stochastic differential equations, etc. Dynamical systems have involved remarkably in recent years. A wealth of new phenomena, new ideas and new techniques are proving to be of considerable interest to scientists in rather different fields. It is not surprising that thousands of publications on the theory itself and on its various applications are appearing DYNAMICS REPORTED presents carefully written articles on major subjects in dynamical systems and their applications, addressed not only to specialists but also to a broader range of readers including graduate students. Topics are advanced, while detailed exposition of ideas, restriction to typical results - rather than the most general one- and, last but not least, lucid proofs help to gain the utmost degree of clarity. It is hoped, that DYNAMICS REPORTED will be useful for those entering the field and will stimulate an exchange of ideas among those working in dynamical systems Summer 1991 Christopher K. R. T Jones Drs Kirchgraber Hans-Otto Walther Managing Editors Table of Contents Limit Relative Category and Critical Point Theory G. Fournier, D. Lupo, M. Ramos, M. Willem 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Relative Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Relative Cupiength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4. Limit Relative Category . . . . . . . . . . . . . . . . . . . . . . . '" . . . . " . . . . . . . . . . . . . . . . 10 5. The Deformation Lemma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6. Critical Point Theorems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7. Some Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

How do international norms evolve? This book examines the manner in which sovereignty, a bedrock norm of international relations since the seventeenth century, has evolved in response to changing conceptions of the responsibilities of government. Whereas most previous studies of international norms have examined how norms influence policy decisions, this book asks, instead, how state policies actively shape international norms. Changing Norms through Actions contends that the concept of sovereignty is moving towards one in which states that are unable or unwilling to fulfill their domestic and international obligations are forced to relinquish certain sovereign responsibilities to the international community. As issues such as genocide, weapons of mass destruction, and terrorism have forced states to reassess their understandings of sovereignty, Ramos is interested in how understandings of norms - particularly long-held norms such as absolute sovereignty - change. If action taken by states reinforces an existing norm or alters current understandings of the norm, states must consider how their actions may change the "rules of the game" for the future. Even when a major power acts primarily out of its own self-interest, without any concern to international norms, the action may have the unintended consequence of modifying the normative environment within which other minor powers act. Shifting understandings of sovereignty (and how states relate to one another) can also have profound implications for the workings of the international system. Ramos looks specifically at what happens to sovereignty when states choose to bypass traditional norms of non-intervention on behalf of other competing norms, such as those regarding counterterrorism, human rights, or weapons of mass destruction.

How do international norms evolve? This book examines the manner in which sovereignty, a bedrock norm of international relations since the seventeenth century, has evolved in response to changing conceptions of the responsibilities of government. Whereas most previous studies of international norms have examined how norms influence policy decisions, this book asks, instead, how state policies actively shape international norms. Changing Norms through Actions contends that the concept of sovereignty is moving towards one in which states that are unable or unwilling to fulfill their domestic and international obligations are forced to relinquish certain sovereign responsibilities to the international community. As issues such as genocide, weapons of mass destruction, and terrorism have forced states to reassess their understandings of sovereignty, Ramos is interested in how understandings of norms - particularly long-held norms such as absolute sovereignty - change. If action taken by states reinforces an existing norm or alters current understandings of the norm, states must consider how their actions may change the "rules of the game" for the future. Even when a major power acts primarily out of its own self-interest, without any concern to international norms, the action may have the unintended consequence of modifying the normative environment within which other minor powers act. Shifting understandings of sovereignty (and how states relate to one another) can also have profound implications for the workings of the international system. Ramos looks specifically at what happens to sovereignty when states choose to bypass traditional norms of non-intervention on behalf of other competing norms, such as those regarding counterterrorism, human rights, or weapons of mass destruction.

iPolitics provides a current analysis of new media's effect on politics. Politicians rely on Twitter, Facebook, and YouTube to exercise political power. Citizens around the world also use these tools to vent political frustrations, join political groups, and organize revolutions. Political activists blog to promote candidates, solicit and coordinate financial contributions, and provide opportunities for volunteers. iPolitics describes the ways in which new media innovations change how politicians and citizens engage the political arena. Most importantly, the volume emphasizes the implications of these changes for the promotion of democratic ideals. Among other things, contributors to this volume analyze whether the public's political knowledge has increased or decreased in the new media era, the role television still plays in the information universe, the effect bloggers have had on the debate and outcome of healthcare reform, and the manner in which political leaders should navigate the new media environment. While the majority of contributors examine new media and politics in the United States, the volume also provides a unique comparative perspective on this relationship using cases from abroad.