65 resultados para 118 Biotieteet


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We investigated M-2 factor and far-field distribution of beams generated by Gaussian mirror resonator. And we found usable analytical expressions of the M2 factor and the far-field distribution intensity with respect to variation of diffraction parameters. Particular attention was paid to the parameters such as mirror spot size and reflectance of the Gaussian mirror. (c) 2006 Elsevier GrnbH. All rights reserved.

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Based on the paraxial vectorial theory of beams propagating in uniaxially anisotropic media, we have derived the analytical propagation equations of beams generated by Gaussian mirror resonator (GMR) in uniaxial crystals, and given the typical numerical example to illustrate our analytical results. Due to the anisotropy crystals, the ordinary and extraordinary beams originated by incident beams generated by GMR propagate with different diffraction lengths, thus the linear polarization state and axial symmetry of the incident beams generated by GMR do not remain during propagating in crystals. (c) 2006 Elsevier GmbH. All rights reserved.

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博优210是华南晚籼杂交稻的“高优”组合,1993和1994年通过省区试和大面积试种表证,1995年5月通过广东省品种委员会审定,具国内同类型品种领先水平。其主要技术经济指标:1、米质1级至特2级(达出口标准),精米率75%,正精米率71%;2、两年省区试产量名列第二位和第一位,比对照组合增产1%和2%,大田一般亩产450公斤;高产的552公斤,比主栽组合博优64增产30公斤;3、高抗稻瘟病,中抗白叶枯病,后期较耐低温;4、较早熟,全生育期118天,比主栽组合博优64早2至3天;5、制种容易,一般亩产200公斤。由于综合性状优良,而具有较高的经济效益和社会效益,种1亩博优210可增值219元,另因少施或不施农药,减少环境污染,而具有一定的生态效益。

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博优210是华南晚籼杂交稻的“高优”组合,1993和1994年通过省区试和大面积试种表证,1995年5月通过广东省品种委员会审定,具国内同类型品种领先水平。其主要技术经济指标:1、米质1级至特2级(达出口标准),精米率75%,正精米率71%;2、两年省区试产量名列第二位和第一位,比对照组合增产1%和2%,大田一般亩产450公斤;高产的552公斤,比主栽组合博优64增产30公斤;3、高抗稻瘟病,中抗白叶枯病,后期较耐低温;4、较早熟,全生育期118天,比主栽组合博优64早2至3天;5、制种容易,一般亩产200公斤。由于综合性状优良,而具有较高的经济效益和社会效益,种1亩博优210可增值219元,另因少施或不施农药,减少环境污染,而具有一定的生态效益。博优210均适宜华南各省晚稻区种植,越南亦大量引进试种。种植面积发展异常迅速,1993年3600亩,1994年10万亩,1995年约90万亩,预计1996年将超过300万亩,行家预测,博优210在“九五”期间必将成为华南晚稻主栽组合。发表在《中国水稻科学》等7篇论文,是杂交稻优质育种和优质高产育种的规律性研究结果,对杂交稻育种具有一定指导意义。成果达国内领先水平。

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