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邢永忠 《天水师范学院学报》1992,(2)
本文通过三代夸克的Fvitzsch质量矩阵,导出了三代夸克的kabayashi—Maskawa混合矩阵的矩阵元与各夸克质量之间的关系.从理论上得到了三代夸克KM矩阵的各矩阵元的大小,将其与目前最新实验结果作了比较.其结果表明:尽管目前人们对t夸克质量的估计值与以前相比,要大几十乃至几百倍,但它与三代夸克的Fritzch质量矩阵是相容的. 相似文献
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本文通过东西方文化传统的历史比较,说明中国不具备自然科学得以产生的文化传统,也没有自然科学产生的哲学基础;通过对逻辑、经验和方法论的分析,说明中国没有自然科学形成所必需的逻辑工具,没有自然科学形成所必需的经验基础及科学方法论的基础;通过对概念、数学基础和语言方面的分析,说明中国没有自然科学所必需的概念的明晰性和准确性,没有自然科学所必需的数学基础,说明在语言方面对自然科学的形成亦造成了一定的障碍.总之,自然科学没有在中国产生有着其历史的必然性,说明了这种文化传统对当今中国科技发展的影响. 相似文献
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Analysis of digenic epistatic effects and QE interaction effects QTL controlling grain weight in rice 总被引：3，自引：0，他引：3
INTRODUCTIONKilo-grainweight,characteristicallyacom-plextrait,isanimportantcomponentofyieldinrice.QTLmappingforkilo-grainweightofricewascon-ductedusingpopulationsofF2(Linetal.,1996),doubledhaploidlines(Luetal.,1997),recombi-nantinbredlines(Xiaoetal.,1996),backcrosstestcross(Xiaoetal.,1995;Lietal.,1997)andratoonedF2(Lietal.,2000).Consideringthesen-sitivityofkilo-grainweighttoenvironments,Luetal.(1997)andZhuangetal.(1997)comparedthedifferentialdetectionofQTLacrossenvironmentstodetermin… 相似文献
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Immortalized F2 population of rice (Oryza sativa L.) was developed by randomly mating F1 among recombinant inbred (RI) lines derived from (Zhenshan 97B ( Minghui 63), which allowed replications within and across environments. QTL (quantitative trait loci) mapping analysis on kilo-grain weight of immortalized F2 population was performed by using newly developed software for QTL mapping, QTLMapper 2.0. Eleven distinctly digenic epistatic loci included a total of 15 QTL were located on eight chromosomes. QTL main effects of additive, dominance, and additive ( additive, additive ( dominance, and dominance ( dominance interactions were estimated. Interaction effects between QTL main effects and environments (QE) were predicted. Less than 40% of single effects, most of which were additive effects, for identified QTL were significant at 5% level. The directional difference for QTL main effects suggested that these QTL were distributed in parents in the repulsion phase. This should make it feasible to improve kilo-grain weight of both parents by selecting appropriate new recombinants. Only few of the QE interaction effects were significant. Application prospect for QTL mapping achievements in genetic breeding was discussed. 相似文献
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