排序方式: 共有17条查询结果,搜索用时 15 毫秒
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柱上衍生反相色谱法测定金属配合物的稳定常数 总被引:7,自引:0,他引:7
提出一种计算金属配合物稳定常数的新方法。应用住上衍生反相高效液相色谱法,以二乙基二硫代氨基甲酸钠为配体,测定金属配合物的保留时间,用以推导金属配合物的稳定常数。 相似文献
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树的罗马控制数和控制数 总被引:1,自引:0,他引:1
A Roman dominating function on a graph G = (V, E) is a function f : V→{0, 1, 2} satisfying the condition that every vertex u for which f(u) = 0 is adjacent to at least one vertex v for which f(v) - 2. The weight of a Roman dominating function is the value (?). The minimum weight of a Roman dominating function on a graph G, denoted byγR(G), is called the Roman dominating number of G. In this paper, we will characterize a tree T withγR(T) =γ(T) 3. 相似文献
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大剪切电子散斑干涉技术不需要引入参考光,具有条纹质量好等特点。提出将干涉场的载频调制技术引入到大剪切电子散斑干涉中,可形成具有载频调制功能的新的电子散斑干涉系统。该系统具有对测量环境的隔振振动要求低,能方便定量求解物体的变形场等优点。首先讨论大剪切载频的调制机理,然后利用中心加载、周边固定的圆盘进行典型实验,设计了可用计算机控制且可对参考物进行精确偏转的步进电机系统,进而实现了对电子散斑干涉场的自动控制调制。最后,利用傅里叶变换法对调制条纹进行解调,解调出变形场的相位,并通过相位与位移的转换计算,得到精确的物体变形场。实验结果证明,该系统能够调制电子散斑干涉场,求解物体的位移场。 相似文献
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本文以大量实验数据为依据,用理论和实验结合的方式,归纳、论证了干扰物对空白、检出限的影响。 相似文献
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考虑病菌的一种信息交流机制,建立一类病菌与免疫系统竞争的时滞传染病模型.分析正平衡点的存在性、渐近稳定性、Hopf分歧的存在性.特别的,研究了无病平衡点E0 在奇异条件(R0=1)下的稳定性.数值模拟验证了所得理论结果. 相似文献
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本文研究多尺度双向向量值正交小波的存在性、构造算法与性质.利用多分辨分析理论,时频分析方法与矩阵理论,给出紧支撑多尺度双向向量值正交小波的构造算法,得到多尺度双向向量值小波包的正交公式与向量值小波包基.推广了向量值正交小波的概念. 相似文献
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A carrier method for separating out-of-plane displacement from in-plane components based on large image-shearing shearography is presented. A reference surface is fixed on the side of a test object. They are illuminated by two expanded symmetric illuminations respectively. The carrier is introduced by rotating the reference surface to modulate the displacement of an object. By using Fourier transform to demodulate the modulated fringe pattern, two phase maps, which include out-of-plane and in-plane displacements, can be obtained. Then the out-of-plane displacement can be easily separated from in-plane displacement by subtraction and addition of the two unwrapped phase distributions. The principle of the method is presented and proved by a typical three-point-bending experiment. Experimental results show that the method enjoys high visibility of carrier fringes. The system does not need a special beam as a reference light and has simple optical setup. 相似文献
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In this paper, we prove that: if M is a family which has convexity radius, then the convexity radius for M and the second order item coefficients of every mapping in M are closely related to each other. As an application, we show that the convexity radius of starlike mappings r(S~*) < 2-3~(1/2). 相似文献