Synthesis and Characterization of Porphyrin-Trisbenzimidazole Dinucleating Ligand and Its Heterodinuclear Complex as CcO Active Site Model

A new dinucleating ligand having two metal-binding sites has been designed and synthesized as model ligand for Cytochrome c Oxidase. The corresponding heterodi-nuclear complex, as an active site model of Cytochrome c Oxidase, consisting of a porphyrinatocobalt compound covalently linked with a copper derivative of tris(2-benzimidazylmethyl) amine bearing three benzimidazole ligands for copper was synthesized and spectroscopically characterized. The spectra data suggest that there are interactions between the cobalt and copper coordination units. The cobalt is coordinated to four central nitrogens of the porphyrin and the copper has pentaco-ordinate geometry with the four tertiary amine nitrogens and a chloride.     

A dynamic fuzzy clustering method based on genetic algorithm

A dynamic fuzzy clustering method is presented based on the genetic algorithm. By calculating the fuzzy dissimilarity between samples the essential associations among samples are modeled factually. The fuzzy dissimilarity between two samples is mapped into their Euclidean distance, that is, the high dimensional samples are mapped into the two-dimensional plane. The mapping is optimized globally by the genetic algorithm, which adjusts the coordinates of each sample, and thus the Euclidean distance, to approximate to the fuzzy dissimilarity between samples gradually. A key advantage of the proposed method is that the clustering is independent of the space distribution of input samples, which improves the flexibility and visualization. This method possesses characteristics of a faster convergence rate and more exact clustering than some typical clustering algorithms. Simulated experiments show the feasibility and availability of the proposed method.     

Do multiple cycles of aeolian deposit-pedogenesis exist in the reticulate red clay sections in southern China?

Since the Quaternary scientists successfully dis-closed the paleoclimatic significance of the loess-paleo- sol sequence in the Loess Plateau, Northwest China, the loess-paleosol sequence has become well-known terres-trial materials revealing the multiple cyclic changes of Quaternary climates. As a carrier of paleoenvironmental information, it could compare beauty with the deep ocean deposit[8]. In recent years, however, the researchers began to put their sights to southern China. They try t…     

聚类方法在警报数据分类与约简中的应用

提出了一个使用文本聚类方法进行警报数据分类与约简的处理框架.详细描述了警报特征向量的表示方法和直接聚类方法,以及警报数据的简约表示方法.     

远程智能答疑系统中FAQ的形成机制

讨论了远程教学系统中智能答疑系统的FAQ(FrequentlyAskedQuestion)的形成机制,此机制有利于实现基于WEB的远程教学系统的智能性和自适应性.     

造船系统中间产品聚类分析法

对中间产品的分类成组是实现中间产品定置、专业化生产的前提条件，但现有的分类方法大多是定性的。应用聚类分析方法实现了中间产品分类成组的定量化，介绍了中间产品特征的数字化方法、相似度的表达及聚类分析的一般步骤与算法。对几个典型的部件分类成组的结果表明，聚类分析方法是可行的。     

基于灰色聚类的水质评价方法

在论述灰色聚类方法原理的基础上，以东江河源段水质评价为实例，探讨了灰色聚类法在水质评价中的应用．     

农村图书室发展路向探索

阐述了农村图书室的地位与作用，探讨了农村图书室的发展路向与对策。     

应用聚类和模糊神经网络方法设计模糊规则库

基于聚类技术和模糊神经网络提出一种新的自动生成模糊系统规则库的设计方法.采用结构辨识和参数辨识相结合的方法,构造模糊系统完善的模糊规则库.用此设计方法对函数逼近问题进行仿真,结果表明该方法具有规则数目少、学习速度快、建模精度高等特点.     

县域土地生态经济系统区划研究--以广西横县为例

土地生态经济系统是融自然、社会、经济于一体的复合系统．文章以位于桂东南的横县为研究区，对土地生态经济分区的原则和指标体系进行了探讨，采用GIS技术建立了包括自然生态、土地资源和社会经济等信息的土地生态经济系统的空间数据库，选择其中40项特征指标，运用SPSS软件对研究区的21个农业乡(镇)进行了聚类分析，据此将研究区划分为4类8个土地生态经济分区，在分析各土地生态经济分区的主要特点基础上，提出了土地资源可持续利用和生态建设方向的合理性建议。