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不同留杈部位对烤烟性状及质量的影响 被引量:16
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作者 韩富根 李浩亮 +1 位作者 韩锦峰 尚现超 《河南农业大学学报》 CAS CSCD 北大核心 2006年第4期350-354,共5页
对豫东烟区早花程度较轻和较重的烟株进行了不同留杈部位对烤烟性状及质量影响的试验研究.结果表明,高杈处理有利于烟株根系和衩烟良好生长,提高烟叶产量,改善烟叶外观质量,协调烟叶化学成分.早花程度较轻和较重烟株的高杈处理烟叶产量... 对豫东烟区早花程度较轻和较重的烟株进行了不同留杈部位对烤烟性状及质量影响的试验研究.结果表明,高杈处理有利于烟株根系和衩烟良好生长,提高烟叶产量,改善烟叶外观质量,协调烟叶化学成分.早花程度较轻和较重烟株的高杈处理烟叶产量分别为2 565.8,2 602.5 kg.hm-2,产值分别为20 674.5,20 854.3元.hm-2,明显高于中杈和低杈处理.同时分析了烟株早花的原因,讨论了高杈处理培育杈烟存在的问题及解决办法,提出了低杈处理培育杈烟的优化措施. 展开更多
关键词 烤烟 早花 留杈部位 权烟
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Comparison of Design Response Spectrum for Long Period Structures Based on Scenario Earthquakes
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作者 Xu Dandan Lv Yuejun +1 位作者 Chen Yang Pan Long 《Earthquake Research in China》 2014年第3期403-412,共10页
Two kinds of determining methods for scenario earthquakes are presented in this paper,namely the weighted average method and maximum probability method. This paper briefly introduces the two methods,then taking a high... Two kinds of determining methods for scenario earthquakes are presented in this paper,namely the weighted average method and maximum probability method. This paper briefly introduces the two methods,then taking a high-rise building in the Yantai area as a case study,we use the weighted average method and maximum probability method to realize seismic hazard analysis, determine earthquake magnitude, the epicenter and specific space position,and then give two response spectrums of the two methods. By comparing the differences of response spectrums between the two methods,we find that the weighted average method is more suitable for long period structures,while considering long period safety. The maximum probability method is more suitable for short period structures. It is reasonable to choose a corresponding different method when the structures have different natural vibration periods. 展开更多
关键词 Long period Scenario earthquake Weighted average method Maximumprobability method Response spectrum
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