Spin angular momentum of photons and the associated polarization of light has been known for many years. However, it is only over the last decade or so that physically realizable laboratory light beams have been used to study the orbital angular momentum of light. In many respects, orbital and spin angular momentum behave in a similar manner, but t
Solar energy is considered by many an attractive and practical option for America's energy future, one that is technically and commercially feasible as well as socially and environmentally desirable. Sun-generated power could meet upwards of 20 percent of U.S. energy needs by the year 2000—but only if there is a concerted national effort to use this energy option. The issues of implementation and the public and private initiatives needed to facilitate a transition to extensive use of solar energy are the focus of this volume. The solar transition is addressed from the diverse perspectives of the many necessary participants: industries and small businesses; local, state, regional, and federal governments; public utilities; policy analysts; and solar advocates. The contributors assess the extent to which solar alternatives can replace and augment other energy forms, the pace and pattern for solar commercialization, and the roles of public and private institutions in carrying out the transition. A consensus becomes apparent: Although the transition to solar energy is technically and commercially viable, its success depends on concerted public and private efforts to promote innovation and diversification in energy production and distribution and to institute major changes in public policy related to energy use.
The historian James Allen Smith traces the evolution of Washington's oldest and prototypical think tank on the occasion of its seventy-fifth anniversary in 1991. Dedicated to bringing expertise to bear on public policy issues, Brookings has been a pioneer in bridging the disparate worlds of social science research and American policymaking. But while its efforts have been made steady, there have been frustrations and controversy over the years. Inspired by the scientific management and government efficiency movements in the Progressive Era, Brookings has evolved from an organization that consulted with government agencies on accounting and personnel practices into an institution with a wide-ranging research and publishing program as well as active public policy education and media outreach efforts. Smith vividly tells of the key individuals, beginning with Robert Brookings, who have shaped the institution. He recounts its relationships with financial supporters and presidential administrations, and he candidly discusses the problems surrounding efforts at funding. Smith places the Brookings research program in an intellectual context and within the changing policymaking environment of Washington. He reveals how Brookings has withstood seventy-five years of shifts in national politics, external perceptions on the institution, and internal leadership to emerge as one of the most prominent sources of policy expertise in the world. The proliferation of private think tanks and the expansion of governmental research agencies in the past quarter century have changed the policy environment. The Brookings Institution, on its seventy-fifth anniversary, offers a singular vantage point from which to observe the ever-changing relationship between expert knowledge and political decisionmaking in our democracy.
What we wish to offer you, then, is an updated professional resource that combines both clinical and scientific perspectives. We hope this book will be helpful to professionals who are already treating addictive disorders and also to those who are just learning how to treat addictions. We also encourage health professionals more generally to think of addictions as falling within their own normal scope of work, and we have kept this in mind in our writing. In addiction treatment, it makes a difference what you do and how you do it, and it is far easier to develop evidence-based practice from the outset than to change already established habits."--Page x.
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