Two large-scale, two-dimensional helicopter tail boom models were used to determine the effects of passive venting on boom down loads and side forces in hovering crosswind conditions. The models were oval shaped and trapeziodal shaped. Completely porous and solid configurations, partial venting in various symmetric and asymmetric configurations, and strakes were tested. Calculations were made to evaluate the trends of venting and strakes on power required when applied to a UH-60 class helicopter. Compared with the UH-60 baseline, passive venting reduced side force but increased down load at flow conditions representing right sideward flight. Selective asymmetric venting resulted in side force benefits close to the fully porous case. Calculated trends on the effects of venting on power required indicated that the high asymmetric oval configuration was the most effective venting configuration for side force retention, and the high asymmetric with a single strake was the most effective for overall power reduction. Also, curves of side force versus flow angle were noticeably smoother for the vented configurations compared with the solid baseline configuration; this indicated a potential for smoother flight in low-speed crosswind conditions.
Fewer than 20% of Baby Boom women will experience a secure retirement. Marriage, education, occupation, home ownership--these variables predict their future. Possession of all four indicates retirement security, and absence of any increases risk of old-age poverty. This riveting sociological study also examines the social relations and structures that will determine the retirement experience, options, and decisions for more than 40 million Baby Boom women. These women's material base and social status are examined through the use of empirical data, and the key predictors of their retirement are identified. The massive entry of Baby Boom women into the labor force increases the importance of retirement planning for working women. It comes at a time when existing research models and data are outdated and inadequate to effectively predict their future retirement experience. Over the past 30 years, American men and their spouses have benefited from the linear, undifferentiated model of the traditional male retirement. For the Baby Boom generation, however, the nature of work has changed significantly. The current retirement model may not serve Baby Boom men as well as in the past, let alone Baby Boom women. In contrast, this book offers a new, dynamic model that considers the social and work structures influencing women's lives and that accurately reflects the predictors and parameters of Baby Boom women's retirement.
The role of agriculture in the Colombian economy and main economic development, 1967-83; Model and empirical evidence; Supply response in Colombian agriculture; Income distribution and real wages in agriculture.
"This is a story that has long needed telling. It is the story of not one town, but four towns that made up an area, and as a result of their being, made possible the growth of a neighboring city. This is the story of the towns of Averill, Edenville, Hope and Sanford, together with a short history of the early Indians of the area and the logging and salt wells that made possible the growth of the city of Midland, Michigan."--Introduction (p. i).
Boom! Is a roller-coaster read with spaceships, spies and mortal danger! Jim and his best friend Charlie weren't looking for adventure, when they decided to bug the staffroom . . . But then they overhear their teachers speaking in a secret language and it's too late to turn back. And now they have to explain to the police, the headmistress and their parents where they've been for a whole week - without mentioning the aliens.
With Baby Boomer women spending over a trillion dollars a year, the days of 40+ women being ignored by marketers are numbered BOOM is a comprehensive guide to identifying, reaching and influencing these women. The book features insights and case histories from 40 top marketers, including executives from Intel, Ford, Seabourn Cruises, Citigroup, Wellpoint, Mary Kay, and more. Key features This is the only book on marketing to this specific demographic. Baby Boomers are the largest generational demographic today, and women not only outnumber men, but also influence as much as 80% of household purchase decisions Includes: The Eight Things You May Not Know About Boomer Women But Should, the Imago Diagnostic (ID), an assessment tool to help marketers identify what makes Baby Boomer women tick and more