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482 đề mục được tìm thấy (Hiển thị 401 - 410) Trước | Tiếp theo
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01-01-1987 A hydraulic ram is a pump that uses the power of falling water to force a small portion of the water to a height greater than the source. Water can be forced about as far horizontally as desired, but greater distances require larger pipe, due to friction. No external power is necessary. With only...
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01-01-1980 Improved use of water as a power source has potential for much of the developing world. There are few places where water is not available in quantities sufficient for power generation. Almost any flowing water--river, brook, or outlet of a lake or pona--can be put to work and will provide a...
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01-01-1989 Supplying power to many remote locations in the world from central generators using customary distribution methods is either economically unfeasible or will be many years in coming. Power, where desirable, will therefore need to be generated locally. Various commercial machinery is marketed, but...
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01-01-1987 Flowing water tends to generate automatically a picture of "free" power in the eyes of the observer. But there is always a cost to producing power from water sources. The cost of developing low-output water power sites should be checked against available alternatives, such as: Electric Utility -...
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01-01-1987 This Industry Profile is one of a series briefly describing small or medium-sized industries. The Profiles provide basic information for starting manufacturing plants in developing nations. Specifically, they provide general plant descriptions, financial, and technical factors for their...
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ECHO Florida and ECHO Asia both have on-campus libraries. These libraries are not lending libraries. Their books are only available locally. However, aportion of the books listed in the ECHOcommunity Book Searchare available as downloads from various sources on the Internet. Books identified as...
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Le présent essai est essentiellement une revue, une tentative de rassemblement des principales informations relatives au problème des relations entre productions animales et végétaux ligneux, considérés dans l'opique environnementale, si actuelle. On s'est efforcé de donner dans une forme...
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01-10-1994 For the urban poor of the South, food is becoming a prohibitively expensive commodity. By the late 1980s, cities of the developing world had to import half their food supply. Urban agriculture, it is argued, can reduce this dependency. But most Southern governments do not support it. Cities...
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01-01-2021 *Available as Download Only Bees provide a critical link in the maintenance of ecosystems, pollination. They play a major role in maintaining biodiversity, ensuring the survival of many plants, enhancing forest regeneration, providing sustainability and adaptation to climate change and improving...
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01-01-2020 *Available as Download Only This is a practical tool to help beekeepers, veterinarians and beekeeping advisory services to properly identify main honeybee diseases and to take the most appropriate actions in the apiary to control and/or prevent disease outbreaks. This publication follows the TECA...