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3D模具设计用CAD软件的选择

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现代制造 2008年第40期 34-35页

作者： peter Dickin

软件世界可提供多种 CAD 软件,凡是希望在模具设计中使用最新3D 技术的加工车间,都可以在一些软件中选用最适合于他们的产品。本文根据各种方法所体现的优点,介绍了一些方法,以便用户能够选则最适合于他们的软件。

关键词： CAD软件模具设计 3D技术加工车间

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Yield enhancement of droughted wheat by film antitranspirant application: rationale and evidence

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Agricultural Sciences 2010年第3期1卷 143-147页

作者： peter S. Kettlewell William L. Heath Ian M. Haigh 不详

Extensive research in the 20th century explored the potential for mitigation of drought by applying polymers (film antitranspirants) to leaves to reduce water loss. It was concluded that film antitranspirants are of limited usefulness, since the polymers reduced photosynthesis (in addition to transpiration) and this was assumed to be detrimental to growth and yield. We propose, however, that irrespective of reduced assimilate availability from photosynthesis, the most drought sensitive stage of yield formation in wheat may respond positively to antitranspirant application. Six field experiments involved ap-plying the film antitranspirant di-1-p-menthene at five development stages and 10 soil moisture deficits (SMD) in total over three years. Yield was reduced when the film antitranspirant was applied at development stages less-sensitive to drought, from inflorescence emergence to anthesis, consistent with the conclusions from previous research. In contrast, yield was increased when the film antitranspirant was applied at flag leaf stage, just before the stage most sensitive to drought (boot stage). These results show that film antitranspirant has the potential to mitigate drought effects on yield of wheat.

关键词： Di-1-p-Menthene Triticum Aestivum Water Deficit

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