Interval parameter perturbation method for evaluating the bounds on natural frequencies of structures with interval parameters

For structural parameters with uncertainties, interval mathematics can, in the case where the probabilistic distribution density of uncertain variables is unavailable, deal with the influence of uncertainties in structural parameters on the response of structures. In order to evaluate the region containing natural frequencies of structures with interval parameters, the interval parameter perturbation method is presented in this paper. The advantage of the present method is its computational efficiency in evaluating the region containing natural frequencies. A numerical example is used to illustrate the efficiency of the method proposed. The project is supported by National Youth Natural Science Foundation of China and National Outstanding Youth Science Foundation of China.     

松弛型并行多分裂方法解非线性方程组的安全界

本文对某些非线性方程组F(x)=0,导出了一个算法,用它可以迭代建立F(x)=0的解的紧致上、下界。算法基于某些矩阵的多分裂,因此具有自然的并行性。我们证明了趋向于解的界之收敛原则,给出了参数的收敛性区域并考察了方法的收敛速度。     

配合物的生成热和配体的质子化热之间的直线焓关系——Ⅶ.Ni(Ⅱ)-2,2′-联吡啶-N-(间位取代苯基)氨基乙酸三元体系

有关Ni(Ⅱ)-N-(间位取代苯基)氨基乙酸二元体系的直线焓和直线熵关系,前文已有报道,本文报告Ni(Ⅱ)-2,2′-联吡啶-N-(间位取代苯基)氨基乙酸(Ni(Ⅱ)-biPy-m-RPhG:R=CH_3,H,CH_3O,Cl)三元体系的生成热研究,发现在此三元体系中亦存在良好的直线焓和直线熵关系。     

四川乌龙茶香气化学成分的剖析

四川乌龙茶在低温减压蒸馏所得香气浓缩物经气相色谱-质谱联用测定,以气相色谱保留值验证,鉴定出19个化合物,它们是:丙酮,乙酸乙酯,顺-3-己烯醇-[1],乙酸顺-3-己烯酯,苯甲醇,反-芳樟醇氧化物(呋喃型),顺-芳樟醇氧化物(呋喃型),芳樟醇,苯乙醇,反-芳樟醇氧化物(吡喃型),丁酸顺-3-己烯酯,香叶烯,己酸顺-3-己烯酯,茉莉酮,橙花叔醇,金台欢醇,茉莉酮酸甲酯,正十六烷和2,6,10,14-四甲基十五烷。