近似度

An iterative reasoning algorithm with time delay of CD is proposed in this paper to resolve time delay of complex system. It is an effective approximating reasoning algorithm for its polynomial time complexity. It realizes dynamic reasoning of causality diagram through multiplication of linkage strength matrix and probability vector when the CD has time delay.

本文针对复杂系统的时间延迟性提出了带时间延迟的因果图迭代推理算法，该算法可以在多项式时间复杂度内完成，是一种有效的近似推理算法。

By employing the theory of ∑Γ－fuzzy truth degree, the concepts of Γ-pseudometric on F was proposed in the propositional logic system Ln. The results obtained can complement and enhance the original theory of metrology of logic, and can give a new frame for fuzzy reasoning study.

特别地证明了真度关系：τΓ+τΓ≤1+τΓ，并利用这一关系在模糊命题演算系统Ln中的公式集F上引入相对于有限理论的Γ-伪距离，从而为在模糊命题逻辑系统Ln中建立相对于有限理论的近似推理框架奠定了基础。

By employing the theory of ∑Γ－fuzzy truth degree, the concepts of Γ-pseudometric on F was proposed in the propositional logic system Ln.

特别地证明了真度关系：τΓ+τΓ≤1+τΓ，并利用这一关系在模糊命题演算系统Ln中的公式集F上引入相对于有限理论的Γ-伪距离，从而为在模糊命题逻辑系统Ln中建立相对于有限理论的近似推理框架奠定了基础。

It is proved firstly that for any time series the regression coefficient can be computed in lianear time and only use constant space.

在此基础上提出了一种基于回归系数的时间序列维约简方法——逐段回归近似，该方法具有线性时间复杂度，并且对均值平稳的独立噪声干扰不敏感。

By employing such a method, 5 series of elastomers, including natural rubbers, elastomeric polyester fibers and ethylene-octene, ethylene-methyl acrylate as well as SIS triblock copolymers, were investigated with the purpose of studying elongation induced phase structure and mobility changes of the samples. For NR samples, it was demonstrated that there exists a small amount of crystals at RT even for unelongated samples. For both NR and the soft segment of PEE, with the increase of elongation ratio, the elongation-induced crystallinity increases almost linearly in a certain region of R, in accord with the increase of the lamellar thickness of the crystals; The behavior of ethylene copolymers, in terms of elongation induced morphorpholgy changes, are quite different from NR and PEE. The crystals are found to be gradually destroyed with the increase of R, with accord with the decrease of the lamellar thickness; The motional behavior of the soft segment of SIS, changes from "liquid" to "solid", in terms of 13C NMR spin-lattice relaxation.For many of the aformented samples, the dependence of 13C spin-lattice relaxtion time T1 on R are different for different groups, indicating that the changes of mobility at MHz frequency region with elongation are different for different groups.

通过对天然橡胶、聚醚酯嵌段共聚物、乙烯-辛烯共聚物、乙烯-丙烯酸甲酯共聚物、SIS等高分子弹性体样品聚集态结构和分子运动的研究，获得了一些新的实验结果，如：给出了确切的实验证据，证明了室温下未拉伸的天然橡胶样品中存在着微量的结晶；发现随着拉伸比增加，天然橡胶及聚醚酯样品的软段部分会出现拉伸诱导的结晶，且结晶度在一定范围内呈现近似线性的增加，所形成晶片的厚度也随之逐渐增加；而乙烯共聚物随着拉伸比的增加，原有的结晶会被逐渐破坏，晶片厚度逐渐变薄，结晶中的缺陷逐渐增加；随着拉伸比的增加，SIS中PI软段部分的核磁共振弛豫行为会出现从液态到固态的转变等；在对上述多个体系的研究中，还发现不同基团的自旋-晶格弛豫时间随着拉伸比呈现不同的变化趋势，表明不同基团的高频运动随拉伸比增加有不同的变化规律。

The exact residual modes for substructures with free interfaces are expressed according to the mixed expansion of dynamic flexibility in the summation of three terms,which include the Rubin s second- order approximate terms and their exact residual term.

采用动柔度混合展开公式导出自由界面子结构精确剩余模态的三项和表达式，它在保留Rubin 二级近似的同时补充了其精确余项。

ANSYS software was used to analyze the two models. Results When Couette flow was loaded, the stereocilia had a larger angular displacement in non-coupled manner, Von Mises stress were higher on tip link and rootlet, and the characteristics of natural frequency were quite similar on two models.

结果 模拟Corti器振动过程，在相同剪切流的压力作用下，静纤毛在不接触盖膜时表现偏移度较大；两种模型均表现在静纤毛顶连接及小根基部应力较高、固有频率近似。

Several models are advanced in this dissertation, such as precision model with Kepler orbit and approximate models with conditions in the proper order of small orbital noncoplanarity, small eccentricity, short distance, short running time and equal orbital semimajor axis.

采用逐步递进的方式，推导了一系列对应Kepler轨道的精确表达式和对应小轨道非共面度、小轨道偏心率、近距离、短时间、相等的轨道半长轴等条件的近似表达式，以适合各种情形下对航天器相对轨道运动的描述。

Based on the mean spherical approximation integral equation theory, perturbation theory and group contribution concept, a new molecular thermodynamic model was established for the representation of activity coefficient of solvent in the IL-containing systems.

利用平均球近似积分方程理论、微扰理论以及基团贡献的基本思想，本文建立了一个适用于含离子液体体系中溶剂活度系数计算的新的分子热力学模型。

It is showed by the result that the suitable forming of beef marbling, distribution of fat like little strip as granule and good distribution in cattle as for beef texture of high grade is good for tenderness, succulence, and sensory of beef.

结果表明：牛肉大理石纹的适量形成、脂肪沉积形状小条近似粒状的均匀分布与牛肉的嫩度、多汁性和适口性有正相关性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。