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The logarithm difference values of partition coefficients of the compounds in butyl ether/water and in cyclohexane/water system were used for the measurement of the Lewis acidity, while the logarithm difference values of partition coefficients in trichloromethane/water and in tetrachloromethane/water system were used for the measurement of the Lewis basicity, and they were used successfully to differentiate the relative strength of Lewis acidity and basicity for 59 benzene and its derivates.

以化合物在正丁醚/水和环己烷/水溶剂体系中分配系数的对数差作为酸性指数,以其在氯仿/水和四氯化碳/水溶剂体系分配系数的对数差作为碱性指数,提出了一种新的度量有机物Lewis酸碱性的方法,按此方法成功地区分了59种苯系物Lewis酸碱性的相对强弱;并成功地将上述酸碱性指数引入定量结构—性质/活性相关研究之中,探讨了苯系物的正辛醇/水分配系数、水溶解度和土壤有机碳吸附系数等常见理化性质与其Lewis酸碱性间的相关性并建立了相应的定量模型,发现它们之间存在良好的相关性。

In this paper the tracking algorithm based on heuristic search is proposed.The starting point is positioned according to the trapezia matching model,gray change property of lane markings and the restraint of real lane width.Then we search the lane edge point from the start point with the tolerance cost rule function.

提出一种边界点启发式搜索算法,根据梯形匹配模型、车道线灰度变化特征和实际车道宽度约束,确定搜索的起始点,从起始点根据度量代价准则函数搜索车道边界点。

Therefore, RAPD markers was used to detect genetic diversity of twenty populations of eighteen species from ten genera in Chinese Unionidae, its phylogeny were studied employing the combined analyses of RAPD markers, rDNA ITS1 sequence analysis and shell morphometrics.

为此,本研究采用RAPD技术对我国10属18种蚌类20个群体的遗传多样性进行了分析,将RAPD标记与rDNAITSl序列分析、贝壳形态度量分析相结合对我国蚌科的系统发育进行了研究。

Barring platform-specific rendering code, code that sizes things based on system metrics, and so on, the rest of the View system is not especially unportable, since most rendering is done using the cross-platform Skia library.

除非是系统相关的绘制代码,用于尺寸的代码都基于系统度量,View系统的其它部分并非完全不可移植,因为许多绘制工作是使用跨平台的Skia库来完成的。

However, its sensitivity to deformations of the patterns and the broad unsharp peaks are significant drawbacks.

为了有效抑制噪声和局部遮挡对图像的影响,提出用鲁棒统计中的一个值代替相关值作为距离度量

As the indispensable parts in this area, the subjects of the measurement, the error-detecting and the amalgamation of knowledge not only are unvaluable amongst the theoretical researches, but at the same time all make contribute to the applications of the practical projects greatly.

作为知识工程领域的重要组成部分,知识度量、知识错误检测及知识融合等子课题不仅具有重要的理论研究价值,而且对实际应用项目也具有积极的指导意义。

In this paper, a brief review and evaluation of existing measure methods about the importance of the vertices was given, i.

在曲线简化过程中,一个最基础的问题是如何度量曲线上节点的重要性程度。

Based on visual perception and image statistic characteristics, propose new techniques for content-aware key feature measurement, extraction and encryption of vidual media, consolidate foundations of mathematic theories of information hiding and embedding, propose robust capacity models and estimation methods for visual media information hiding and embedding; solve the key problems inherent in digital content certification of visual media, systematically establish controllable content-aware security mechanism of visual media

基于视觉感知和图像统计特性,提出可视媒体基于内容的关键特征度量、提取和加密的新方法;完善信息嵌入与隐藏的数学理论基础,提出高鲁棒性的可视媒体信息嵌入与隐藏的容量模型和方法,解决可视媒体的内容认证问题,系统地建立可控的可视媒体内容安全新机制。

And the direction query efficiency based on multi-approximate index is compared with that based on taditional external approximation index. 2 The algorithms of nearest neighbor and reverse nearest neighbor about point, line and ploygen based on multi-approximate index are proposed after the virous methods of distance measure are discussed in detail. And the query efficiency of NN and RNN based on multi-approximate index is compared with that based on taditional external approximation index. 3 The basic concept of semi-join and the strategy of distance-direction semi-join are introduced. And the model of distance relationship, direction relationship and the bounding for spatial object are discussed. Then the method is presented about how to implement the query of distance-direction semi-join, and the efficiency of the algorithm based on multi-approximate index is compared with that based on taditional external approximation index.

即:1在方向关系矩阵模型、开域方向模型基础上,讨论了基于多重近似索引下的定性与定量方向检索方法,并通过实验对基于多重近似索引与外部近似索引下的方向检索效率进行了对比分析;2详细讨论了各种距离度量方法,提出了基于多重近似索引下的点、线、面的最邻近查询和反最邻近查询算法,并通过实验对基于多重近似索引与外部近似索引下的最邻近查询和反最邻近查询效率进行比较分析;3介绍了半连接的基本概念,探讨了距离关系、方向关系以及空间对象数量的约束模型,给出了基于多重近似索引下的距离方向半连接实现方法,并通过实验对基于多重近似索引与外部近似索引下的距离方向半连接的效率进行了比较分析。

In this paper, we extend empirical likelihood to partial linear errors-in-variables model, a nonparametric version of Wilk's theorem is derived.

本文,我们把经验似然推广到部分线性度量误差模型,得到了非参数的Wilk's定理,我们的方法可以用来构建置信区间,也可以用来检验。

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推荐网络例句

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了,排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意,我建议我们在价格上大家各让一半。

After an hour and no pup, look for continued contractions and arching of the back with no pup as a sign of trouble.

一个小时后,并没有任何的PUP ,寻找继续收缩和拱的背面没有任何的PUP作为一个注册的麻烦。