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The spatial distribution function and second moments of circular freely jointed chain are derived based on an analytical method. The circular Gauss chain, which is simple for long chains, is compared with the circular freely jointed chain, which is exact for short chains. It is shown that the Gauss chain model predicts a more compact configurational distribution than the exact freely jointed chain. The two chain models, however, become closer to each other when the chain length increases. It is found that the difference of the mean square radius of gyration calculated with these two chain models is a constant, independent of the chain length. 相似文献
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我们将前人发展的半经验构型能量分析方法用来计算聚糖、多肽、聚核苷酸分子的构型能量,并发展了一种计算各种生物聚分子构型能量的一般计算方法。已编写出FORTRAN语言的计算机程序。用这种方法巳完成如下计算。 1.聚糖类大分子是基本的生物聚分子之一。晶体结构研究表明,聚糖链中吡喃糖环的构型变化很小,链 相似文献
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