In floating lapping with solid abrasives, the workpiece is taken as an isolated body. The forces that act on it are analyzed. A differential equation about the forces that act on it is set up, so the forces that act o...In floating lapping with solid abrasives, the workpiece is taken as an isolated body. The forces that act on it are analyzed. A differential equation about the forces that act on it is set up, so the forces that act on it and its motion rule are received. Combining it with known lapping tool motion, the relative motion rule between the lapping tool and workpiece is determined too. According to the relative motion, the distribution of abrasives density is designed reasonably, which makes the lapping tool wear uniformly, which, in turn, avoids redressing the lapping tool, saves abra-sives, and increases machining accuracy. Combining it with advantages in high speed lapping with solid abrasives, the low cost, high efficiency nanometer lapping at high speed is realized.展开更多
The morphology dependent of migration and recombination kinetics of charge carriers in the polymersolar cell based on poly {2,7′-9,9-dioctyfiuorene-alt-5-diethylhexyl-3,6-bis（5-bromothiophen-2-yl）pyrrolo[3,4-c]-pyr...The morphology dependent of migration and recombination kinetics of charge carriers in the polymersolar cell based on poly {2,7′-9,9-dioctyfiuorene-alt-5-diethylhexyl-3,6-bis（5-bromothiophen-2-yl）pyrrolo[3,4-c]-pyrrole-1,4-dione}（PDPP-F） was investigated with photo-induced charge carrier extraction by linearly increasingvoltage technique. The recombination coefficient of charge carriers decreased and the mobility of charge carriersincreased, after the mass ratio of [6,6]-phenyl-C61-butyric acid methyl ester（PCBM） increased from 3：2 to 2：1.Meanwhile, both of them were sensitive to the applied electric field and could be together responsible for theimprovement of voltage performance of polymer solar cell.展开更多
基金the National Natural Science Foundation of China (Grant No. 50375021)
文摘In floating lapping with solid abrasives, the workpiece is taken as an isolated body. The forces that act on it are analyzed. A differential equation about the forces that act on it is set up, so the forces that act on it and its motion rule are received. Combining it with known lapping tool motion, the relative motion rule between the lapping tool and workpiece is determined too. According to the relative motion, the distribution of abrasives density is designed reasonably, which makes the lapping tool wear uniformly, which, in turn, avoids redressing the lapping tool, saves abra-sives, and increases machining accuracy. Combining it with advantages in high speed lapping with solid abrasives, the low cost, high efficiency nanometer lapping at high speed is realized.
文摘The morphology dependent of migration and recombination kinetics of charge carriers in the polymersolar cell based on poly {2,7′-9,9-dioctyfiuorene-alt-5-diethylhexyl-3,6-bis（5-bromothiophen-2-yl）pyrrolo[3,4-c]-pyrrole-1,4-dione}（PDPP-F） was investigated with photo-induced charge carrier extraction by linearly increasingvoltage technique. The recombination coefficient of charge carriers decreased and the mobility of charge carriersincreased, after the mass ratio of [6,6]-phenyl-C61-butyric acid methyl ester（PCBM） increased from 3：2 to 2：1.Meanwhile, both of them were sensitive to the applied electric field and could be together responsible for theimprovement of voltage performance of polymer solar cell.
