The matrix effects of 14 organophosphorus pesticides in 9 kinds of vegetables matrices were preliminarily studied by gas chromatography/flame photomet- ric detection（FPD） in the paper. The matrix effects of 14 organ...The matrix effects of 14 organophosphorus pesticides in 9 kinds of vegetables matrices were preliminarily studied by gas chromatography/flame photomet- ric detection（FPD） in the paper. The matrix effects of 14 organophosphoms pesticides in 9 kinds of vegetable matrices at 0.05, 0.1 and 0.2 mg/L were compared, respectively. The results showed that matrix enhancement effect and matrix attenuation effect existed in all cases, while matrix effects did not have strong correlation with concentrations of pesticides, but were related to species of vegetables and structure and polarity of pesticides.展开更多
The 3─roll reducing processes are simulated and predicted by using 3─D elastic─plastic large strain FEM on the PC / 386 computer.The displacement field and flow field of workpiece deformation are given. The interna...The 3─roll reducing processes are simulated and predicted by using 3─D elastic─plastic large strain FEM on the PC / 386 computer.The displacement field and flow field of workpiece deformation are given. The internal angle defects of the seamless tube are studied in detail during 3─roll reducing.the predictions of the forming product quality and technology parameter are realized by means of PC / 386 computer.展开更多
The aluminium sheet rolling is studied by using three dimensional elastic-plastic finite element method (FEM) based on considering both material and geometric non linearity.Three dimensional distribution of the stress...The aluminium sheet rolling is studied by using three dimensional elastic-plastic finite element method (FEM) based on considering both material and geometric non linearity.Three dimensional distribution of the stress and deformation are given on the VAX11 / 780 computer. The spread deformaton of the workpiece is analyzed by means of the moire method.The calculation results are compared with experimental results of the moire and agreement is well.展开更多
文摘The matrix effects of 14 organophosphorus pesticides in 9 kinds of vegetables matrices were preliminarily studied by gas chromatography/flame photomet- ric detection（FPD） in the paper. The matrix effects of 14 organophosphoms pesticides in 9 kinds of vegetable matrices at 0.05, 0.1 and 0.2 mg/L were compared, respectively. The results showed that matrix enhancement effect and matrix attenuation effect existed in all cases, while matrix effects did not have strong correlation with concentrations of pesticides, but were related to species of vegetables and structure and polarity of pesticides.
文摘The 3─roll reducing processes are simulated and predicted by using 3─D elastic─plastic large strain FEM on the PC / 386 computer.The displacement field and flow field of workpiece deformation are given. The internal angle defects of the seamless tube are studied in detail during 3─roll reducing.the predictions of the forming product quality and technology parameter are realized by means of PC / 386 computer.
文摘The aluminium sheet rolling is studied by using three dimensional elastic-plastic finite element method (FEM) based on considering both material and geometric non linearity.Three dimensional distribution of the stress and deformation are given on the VAX11 / 780 computer. The spread deformaton of the workpiece is analyzed by means of the moire method.The calculation results are compared with experimental results of the moire and agreement is well.
