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Author: J. M. Ledgard
Publisher: Coffee House Press
ISBN: 1566893194
Category : Fiction
Languages : en
Pages : 226
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Book Description
Award-winning foreign correspondent’s cerebral spy novel-cum-love story exposes humanity’s tenuous hold on a vast and relentless world.
Author: J. M. Ledgard
Publisher: Coffee House Press
ISBN: 1566893194
Category : Fiction
Languages : en
Pages : 226
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Book Description
Award-winning foreign correspondent’s cerebral spy novel-cum-love story exposes humanity’s tenuous hold on a vast and relentless world.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309091144
Category : Science
Languages : en
Pages : 159
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Book Description
Deep-diving manned submersibles, such as Alvin, which gained worldwide fame when researchers used it to reach the wreck of the Titanic, have helped advance deep-ocean science. But many scholars in this field have noted that the number and capabilities of today's underwater vehicles no longer meet current scientific demands. At the same time, the relative value of manned and unmanned vehicles is often disputed. The report finds that new submersibles-both manned and unmanned-that are more capable than those in the current fleet are needed and would be of great value to the advancement of ocean research.
Author: United States. General Accounting Office
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
Author: Adele Marion Fielde
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
Author: Edward B. Hands
Publisher:
ISBN:
Category : Submerged lands
Languages : en
Pages : 20
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Book Description
Submergence affects most U.S. shorelines, and has created serious problems in many localities by increasing flooding, accelerating erosion, altering surface drainage, and causing structural damage. This paper presents selected examples illustrating the problems engineers face in areas of coastal submergence and discusses in general how sea-level changes affect long-term shore processes. (Author).
Author:
Publisher:
ISBN:
Category : Deep diving
Languages : en
Pages : 108
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Book Description
Author: T. R. Paris
Publisher: IRRI
ISBN: 9712202623
Category : Agricultural development projects
Languages : en
Pages : 120
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Book Description
The Green Revolution averted the threat of famine through the rapid adoption of improved rice varieties. However, despite this huge success, hundreds of millions of poor rice-farming families in rainfed areas still live in poverty and suffer from food (rice) insecurity. Despite many released improved rice varieties for rainfed conditions, farmers still use local varieties that can withstand drought and floods but have low yields or they use the same varieties for many years because of a lack of better varieties. Rainfed rice farmers are slow to adopt improved varieties because of several problems. One problem is more of extension than breeding - many farmers, particularly those living in remote rainfed areas, may not have access to or information about the seed of new varieties. Another problem is that variety testing programs are often conducted on-station, which does not represent farmers' fields. Moreover, conventional rice breeding programs usually seek farmers' input only at the very end of the process, when newly released varieties, usually one or two per year, are evaluated in on-farm demonstration trials. Often, in remote and unfavorable areas, subsistence farmers, who comprise the majority of the rural farming population in Asia, give importance to social and cultural dimensions aside from the agronomic performance of the new rice varieties. The complexities of developing acceptable varieties for variable and stressful rainfed environments require that breeders become deeply familiar with men and women farmers' needs and preferences. Since 1977, IRRI has been making efforts to improve communication among farmers, breeders, and extension workers so that men and women farmers' concerns and preferences are considered in plant breeding objectives. Participatory varietal selection (PVS) is a simple way for breeders and agronomists to learn which varieties perform well on-station and on-farm and to obtain feedback from the potential end users in the early phases of the breeding cycle. It is a means for social scientists to identify the varieties that most men and women farmers prefer, including the reasons for their preference and constraints to adoption. Based on IRRI's experience in collaboration with national agricultural research and extension system partners and farmers, PVS, which includes "researcher-managed" and "farmer-managed" trials, is an effective strategy for accelerating the dissemination of stress-tolerant varieties. PVS has also been instrumental in the fast release of stress-tolerant varieties through the formal varietal release system. This guide on PVS will complement the various training programs given by IRRI for plant breeders, agronomists, and extension workers engaged in rice varietal development and dissemination.
Author: United States. Naval Material Command
Publisher:
ISBN:
Category : Deep diving
Languages : en
Pages : 188
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Book Description
Author: Walter Edgar Jessup
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
Author: G. K. Manning
Publisher:
ISBN:
Category : Hulls (Naval architecture)
Languages : en
Pages : 18
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Book Description
Three types of ferrous materials that deserve to be considered as future hull materials are discussed. The present state of knowledge can be summarized this way: quenched and tempered steels with 0.20% carbon and yield strengths of about 170,000 psi can probably be developed into a useful hull material in less time than either of the other two classes. Maraging steels have great potential if it is possible to improve their toughness. This may be resolved within a few months and surely within a year. The stable austenitic steels appear to offer the greatest potential, but less is known about these than about the other two classes of materials. (Author).
