Nonlinear Free Vibrations of C-C-SS-SS Symmetrically Laminated Carbon Fiber Reinforced Plastic (CFRP) Rectangular Composite Plates

The purpose of this paper is to apply the theoretical model developed in References [1] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400310032003700320039003100350035000000 -[6] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400310032003700320039003100360030000000 in order to analyze the geometrically nonlinear free dynamic response of C-C-SS-SS rectangular CFRP symmetrically laminated plates so as to investigate the effect of nonlinearity on the nonlinear resonance frequencies, the nonlinear fundamental mode shape and associated bending stress patterns at large vibration amplitudes. Various values of the plate aspect ratio and the amplitude of vibrations will be considered, and useful numerical data also are provided.

HPLC法测定不同品种柴胡中的柴胡皂苷a、c、d的含量

目的 考察不同品种柴胡中柴胡皂苷 a、c、d的含量 ,以期扩大柴胡药用品种的范围。方法 采用 RP-HPL C法 ,使用 L U NA C1 8柱、乙腈 -水为流动相进行梯度洗脱 ,检测波长为 2 10 nm ,以柴胡皂苷 a、c、d含量为指标进行比较。结果 不同品种柴胡中的柴胡皂苷 a、c、d含量差异悬殊 ,其中云南会泽产多枝柴胡中的含量最高。结论研究所建立的方法适合不同品种柴胡中柴胡皂苷 a、c、d的定量分析 ,并且结果准确可靠。