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MEASUREMENT of the absolute value of absorption by water vapour at microwave frequencies is difficult because the effect is so small. Far in the wings of the absorption lines, in the so-called 'windows' of the spectrum, it is especially difficult to achieve high accuracy in the free atmosphere. But it is in these windows that the behaviour of the absorption is important from both applied and scientific points of view. Satellite communications, remote sensing of the atmosphere, and radioastronomy, are all influenced by this behaviour. Measurements on an Earth-space path are reported here; the results indicate a nonlinear relationship between absorption and water-vapour content. 相似文献
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R Morfin J M Guiraud B Ducouret S Samperez P Jouan 《Comptes rendus des séances de l'Académie des sciences. Série D, Sciences naturelles》1979,288(4):437-440
Incubation of 3H-5 alpha-androstane-3 beta, 17 beta-diol with anterior pituitaries from immature male Rats led to the major production of polar radio-metabolites. Of these, 53 and 27% were identified with 5 alpha-androstane-3 beta, 6 alpha, 17 beta-triol and 5 alpha-androstane-3 beta, 7 alpha, 17 beta-triol, respectively. The formation of these trihydroxysteroids may be involved in the intracellular regulation of 5 alpha-androstane-3 beta, 17 beta-diol levels. 相似文献
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农村党支部与村委会的关系是领导与被领导的关系。当前必须明确规范材党支部和村委会的职责,建立健全处理“两委”关系的各项制度和工作运行机制,保障村党支部和村委会充分发挥作用。 相似文献
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