In the thirty years since the invention of the CO2 gas laser, the major design issue has shifted from how to obtain the desired power level to how to achieve reliable operation. At the same time, the opening of many laser development facilities in the Former Soviet Union has allowed their achievements and design approaches to be understood and appreciated for the first time. Further, the industrial laser user community has identified a number of emerging applications at higher power levels (15-20 kW) than are attainable by most commercial devices. In High Power Lasers - Science and Engineering, the designers, developers and users of high-power gas laser systems discuss design approaches, methods of enhancing performance, new applications, and user requirements.

The protection of groundwater resources has emerged in recent years as a high priority topic on the agenda of many countries. In responding to the growing concern over deteriorating groundwater quality, many countries are developing a comprehensive regulatory framework for the management of subsurface water resources with management referring to both quantity and quality aspects. Within this framework, groundwater models are rapidly coming to playa central role in the development of protection and rehabilitation strategies. These models provide forecasts of the future state of the groundwater aquifer systems and/or the unsaturated zone in response to proposed management initiatives. For example, models will predict the effects of implementing a proposed management scheme on water levels and on the transport and fate of pollutants. The models are now used in the formulation of policies and regulations, the issuing of permits, design of monitoring and data collection systems, and the development of enforcement actions. The growth in the use of these sophisticated tools has led to many unforeseen problems in groundwater management. Lingering issues include reliability of codes, quality assurance in model development and applications, efficient utiliza tion of human and material resources, technology transfer and training. Some issues have legal ramifications, as in cases where the applications of models have been contested in courts."

THE NEW YORK TIMES BESTSELLER 'When one of the world's leading scholars of civil war tells us that a country is on the brink of violent conflict, we should pay attention. This is an important book' Steven Levitsky and Daniel Ziblatt, authors of How Democracies Die Civil wars are the biggest danger to world peace today - this book shows us why they happen, and how to avoid them. We are now living in the world's greatest era of civil wars. While violence has declined worldwide, major civil wars are now being fought in countries including Iraq, Syria and Libya, and smaller civil wars are being fought in India and Malaysia. Even countries we thought could never experience another civil war - such as the USA, Sweden and Ireland - are showing signs of unrest. So how can we stop them? In How Civil Wars Start, acclaimed expert Professor Barbara F. Walter, who has advised on political violence everywhere from the CIA to the U.S. Senate to the United Nations, explains the rise of civil wars and the conditions that create them - not least when countries are not quite democratic. As democracies across the world backslide and citizens become more polarised, civil wars will become even more widespread and last longer than they have in the past - but this urgent and important book shows us a path back toward peace.

The protection of groundwater resources has emerged in recent years as a high priority topic on the agenda of many countries. In responding to the growing concern over deteriorating groundwater quality, many countries are developing a comprehensive regulatory framework for the management of subsurface water resources with management referring to both quantity and quality aspects. Within this framework, groundwater models are rapidly coming to playa central role in the development of protection and rehabilitation strategies. These models provide forecasts of the future state of the groundwater aquifer systems and/or the unsaturated zone in response to proposed management initiatives. For example, models will predict the effects of implementing a proposed management scheme on water levels and on the transport and fate of pollutants. The models are now used in the formulation of policies and regulations, the issuing of permits, design of monitoring and data collection systems, and the development of enforcement actions. The growth in the use of these sophisticated tools has led to many unforeseen problems in groundwater management. Lingering issues include reliability of codes, quality assurance in model development and applications, efficient utiliza tion of human and material resources, technology transfer and training. Some issues have legal ramifications, as in cases where the applications of models have been contested in courts."

In the thirty years since the invention of the CO2 gas laser, the major design issue has shifted from how to obtain the desired power level to how to achieve reliable operation. At the same time, the opening of many laser development facilities in the Former Soviet Union has allowed their achievements and design approaches to be understood and appreciated for the first time. Further, the industrial laser user community has identified a number of emerging applications at higher power levels (15-20 kW) than are attainable by most commercial devices. In High Power Lasers - Science and Engineering, the designers, developers and users of high-power gas laser systems discuss design approaches, methods of enhancing performance, new applications, and user requirements.

Of all the different types of civil war, disputes over self-determination are the most likely to escalate into war and resist compromise settlement. Reputation and Civil War argues that this low rate of negotiation is the result of reputation building, in which governments refuse to negotiate with early challengers in order to discourage others from making more costly demands in the future. Jakarta s wars against East Timor and Aceh, for example, were not designed to maintain sovereignty but to signal to Indonesia s other minorities that secession would be costly. Employing data from three different sources - laboratory experiments on undergraduates, statistical analysis of data on self-determination movements, and qualitative analyses of recent history in Indonesia and the Philippines - Barbara F. Walter provides some of the first systematic evidence that reputation strongly influences behavior, particularly between governments and ethnic minorities fighting over territory.

Lasers with a gaseous active medium offer high flexibility, wide tunability, and advantages in cost, beam quality, and power scalability. Gas lasers have tended to become overshadowed by the recent popularity and proliferation of semiconductor lasers. As a result of this shift in focus, details on modern developments in gas lasers are difficult to find. In addition, different types of gas lasers have unique properties that are not well-described in other references. Collecting expert contributions from authorities dealing with specific types of lasers, Gas Lasers examines the fundamentals, current research, and applications of this important class of laser. It is important to understand all types of lasers, from solid-state to gaseous, before making a decision for any application. This book fills in the gaps by discussing the definition and properties of gaseous media along with its fluid dynamics, electric excitation circuits, and optical resonators. From this foundation, the discussion launches into the basic physics, characteristics, applications, and current research efforts for specific types of gas lasers: CO lasers, CO2 lasers, HF/DF lasers, excimer lasers, iodine lasers, and metal vapor lasers. The final chapter discusses miscellaneous lasers not covered in the previous chapters. Collecting hard-to-find material into a single, convenient source, Gas Lasers offers an encyclopedic survey that helps you approach new applications with a more complete inventory of laser options.

Of all the different types of civil war, disputes over self-determination are the most likely to escalate into war and resist compromise settlement. Reputation and Civil War argues that this low rate of negotiation is the result of reputation building, in which governments refuse to negotiate with early challengers in order to discourage others from making more costly demands in the future. Jakarta s wars against East Timor and Aceh, for example, were not designed to maintain sovereignty but to signal to Indonesia s other minorities that secession would be costly. Employing data from three different sources - laboratory experiments on undergraduates, statistical analysis of data on self-determination movements, and qualitative analyses of recent history in Indonesia and the Philippines - Barbara F. Walter provides some of the first systematic evidence that reputation strongly influences behavior, particularly between governments and ethnic minorities fighting over territory.

Predictions that globalization would undermine territorial attachments and weaken the sources of territorial conflict have not been realized in recent decades. Globalization may have produced changes in territoriality and the functions of borders, but it has not eliminated them. The contributors to this volume examine this relationship, arguing that much of the change can be attributed to sources other than economic globalization. Bringing the perspectives of law, political science, anthropology, and geography to bear on the complex causal relations among territoriality, conflict, and globalization, leading contributors examine how territorial attachments are constructed, why they have remained so powerful in the face of an increasingly globalized world, and what effect continuing strong attachments may have on conflict. They argue that territorial attachments and people's willingness to fight for territory depends upon the symbolic role it plays in constituting people's identities, and producing a sense of belonging in an increasingly globalized world.

Why do some civil wars end in successfully implemented peace settlements while others are fought to the finish? Numerous competing theories address this question. Yet not until now has a study combined the historical sweep, empirical richness, and conceptual rigor necessary to put them thoroughly to the test and draw lessons invaluable to students, scholars, and policymakers. Using data on every civil war fought between 1940 and 1992, Barbara Walter details the conditions that lead combatants to partake in what she defines as a three-step process--the decision on whether to initiate negotiations, to compromise, and, finally, to implement any resulting terms. Her key finding: rarely are such conflicts resolved without active third-party intervention.

Walter argues that for negotiations to succeed it is not enough for the opposing sides to resolve the underlying issues behind a civil war. Instead the combatants must clear the much higher hurdle of designing credible guarantees on the terms of agreement--something that is difficult without outside assistance. Examining conflicts from Greece to Laos, China to Columbia, Bosnia to Rwanda, Walter confirms just how crucial the prospect of third-party security guarantees and effective power-sharing pacts can be--and that adversaries do, in fact, consider such factors in deciding whether to negotiate or fight. While taking many other variables into account and acknowledging that third parties must also weigh the costs and benefits of involvement in civil war resolution, this study reveals not only how peace is possible, but probable.

Predictions that globalization would undermine territorial attachments and weaken the sources of territorial conflict have not been realized in recent decades. Globalization may have produced changes in territoriality and the functions of borders, but it has not eliminated them. The contributors to this volume examine this relationship, arguing that much of the change can be attributed to sources other than economic globalization. Bringing the perspectives of law, political science, anthropology, and geography to bear on the complex causal relations among territoriality, conflict, and globalization, leading contributors examine how territorial attachments are constructed, why they have remained so powerful in the face of an increasingly globalized world, and what effect continuing strong attachments may have on conflict. They argue that territorial attachments and people's willingness to fight for territory depends upon the symbolic role it plays in constituting people's identities, and producing a sense of belonging in an increasingly globalized world.