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Author: T.A. Heppenheimer Publisher: Courier Dover Publications ISBN: 0486834514 Category : Technology & Engineering Languages : en Pages : 355
Book Description
This volume from The NASA History Series presents an overview of the science of hypersonics, the study of flight at speeds at which the physics of flows is dominated by aerodynamic heating. The survey begins during the years immediately following World War II, with the first steps in hypersonic research: the development of missile nose cones and the X-15; the earliest concepts of hypersonic propulsion; and the origin of the scramjet engine. Next, it addresses the re-entry problem, which came to the forefront during the mid-1950s, showing how work in this area supported the manned space program and contributed to the development of the orbital shuttle. Subsequent chapters explore the fading of scramjet studies and the rise of the National Aerospace Plane (NASP) program of 1985–95, which sought to lay groundwork for single-stage vehicles. The program's ultimate shortcomings — in terms of aerodynamics, propulsion, and materials — are discussed, and the book concludes with a look at hypersonics in the post-NASP era, including the development of the X-33 and X-34 launch vehicles, further uses for scramjets, and advances in fluid mechanics. Clearly, ongoing research in hypersonics has yet to reach its full potential, and readers with an interest in aeronautics and astronautics will find this book a fascinating exploration of the field's history and future.
Author: T.A. Heppenheimer Publisher: Courier Dover Publications ISBN: 0486834514 Category : Technology & Engineering Languages : en Pages : 355
Book Description
This volume from The NASA History Series presents an overview of the science of hypersonics, the study of flight at speeds at which the physics of flows is dominated by aerodynamic heating. The survey begins during the years immediately following World War II, with the first steps in hypersonic research: the development of missile nose cones and the X-15; the earliest concepts of hypersonic propulsion; and the origin of the scramjet engine. Next, it addresses the re-entry problem, which came to the forefront during the mid-1950s, showing how work in this area supported the manned space program and contributed to the development of the orbital shuttle. Subsequent chapters explore the fading of scramjet studies and the rise of the National Aerospace Plane (NASP) program of 1985–95, which sought to lay groundwork for single-stage vehicles. The program's ultimate shortcomings — in terms of aerodynamics, propulsion, and materials — are discussed, and the book concludes with a look at hypersonics in the post-NASP era, including the development of the X-33 and X-34 launch vehicles, further uses for scramjets, and advances in fluid mechanics. Clearly, ongoing research in hypersonics has yet to reach its full potential, and readers with an interest in aeronautics and astronautics will find this book a fascinating exploration of the field's history and future.
Author: Alex Berenson Publisher: G.P. Putnam's Sons ISBN: 0515153702 Category : Fiction Languages : en Pages : 514
Book Description
When four friends, working at a giant refugee camp in Kenya for Somalis, are hijacked by bandits, John Wells, brought in to find them, goes undercover in a country that isn't his usual playing field where he discovers that the truth behind the kidnappings is far more complex than he imagined.
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 0309444454 Category : Social Science Languages : en Pages : 643
Book Description
The Economic and Fiscal Consequences of Immigration finds that the long-term impact of immigration on the wages and employment of native-born workers overall is very small, and that any negative impacts are most likely to be found for prior immigrants or native-born high school dropouts. First-generation immigrants are more costly to governments than are the native-born, but the second generation are among the strongest fiscal and economic contributors in the U.S. This report concludes that immigration has an overall positive impact on long-run economic growth in the U.S. More than 40 million people living in the United States were born in other countries, and almost an equal number have at least one foreign-born parent. Together, the first generation (foreign-born) and second generation (children of the foreign-born) comprise almost one in four Americans. It comes as little surprise, then, that many U.S. residents view immigration as a major policy issue facing the nation. Not only does immigration affect the environment in which everyone lives, learns, and works, but it also interacts with nearly every policy area of concern, from jobs and the economy, education, and health care, to federal, state, and local government budgets. The changing patterns of immigration and the evolving consequences for American society, institutions, and the economy continue to fuel public policy debate that plays out at the national, state, and local levels. The Economic and Fiscal Consequences of Immigration assesses the impact of dynamic immigration processes on economic and fiscal outcomes for the United States, a major destination of world population movements. This report will be a fundamental resource for policy makers and law makers at the federal, state, and local levels but extends to the general public, nongovernmental organizations, the business community, educational institutions, and the research community.
Author: World Bank Publisher: World Bank Publications ISBN: 0821381415 Category : Social Science Languages : en Pages : 280
Book Description
This book examines how to ensure that the preventive measures are worthwhile and effective, and how people can make decisions individually and collectively at different levels of government.
Author: World Bank Publisher: World Bank Publications ISBN: 9780821358269 Category : Business & Economics Languages : en Pages : 226
Book Description
Despite having a number of potential attributes (such as being English-speaking, having poverty levels below that of comparable countries and a reasonably well-educated labour force), Jamaicas economic history is marked by the paradoxes of low growth in GDP and high employment despite high investment and important achievements in poverty reduction. This publication seeks to examines these issues, and topics discussed include: poverty reduction and income inequality; whether Jamaicas GDP growth has been underestimated; policy options for reducing the fiscal and debt burden, revitalising the financial system; improving education outcomes, tackling the economic costs of crime, and improving international competitiveness.
Author: T.A. Heppenheimer
Author: T.A. Heppenheimer
Author: Alex Berenson
Author: National Academies of Sciences, Engineering, and Medicine
Author: World Bank
Author: World Bank
Author: Katherine Johnson Ringsmuth
Author: 
Author: 
Author: Peter Newman
Author: John F. Shiner