Control parameters of original differential evolution （DE） are kept fixed throughout the entire evolutionary process. However, it is not an easy task to properly set control parameters in DE for different optiinizat...Control parameters of original differential evolution （DE） are kept fixed throughout the entire evolutionary process. However, it is not an easy task to properly set control parameters in DE for different optiinization problems. According to the relative position of two different individual vectors selected to generate a difference vector in the searching place, a self-adapting strategy for the scale factor F of the difference vector is proposed. In terms of the convergence status of the target vector in the current population, a self-adapting crossover probability constant CR strategy is proposed. Therefore, good target vectors have a lower CFI while worse target vectors have a large CFI. At the same time, the mutation operator is modified to improve the convergence speed. The performance of these proposed approaches are studied with the use of some benchmark problems and applied to the trajectory planning of a three-joint redundant manipulator. Finally, the experiment results show that the proposed approaches can greatly improve robustness and convergence speed.展开更多
A self-regulating humidity material with bamboo for the room was prepared. The activated carbons were prepared with the temperature rising rates of 5, 10, 15, 20 ℃/min and constant temperatures of 600, 700, 800, 900,...A self-regulating humidity material with bamboo for the room was prepared. The activated carbons were prepared with the temperature rising rates of 5, 10, 15, 20 ℃/min and constant temperatures of 600, 700, 800, 900, 1 000, 1 100, 1 200, 1 300, 1 400, and 1 500 ℃ for 0.5, 1, 2, 3, and 6 h, respectively.And then their structures such as specific surface areas, volumes of pores from 3.7-7.1 nm and average pore diameters were tested. Various humidity conditions were simulated and their self-regulating humidity properties such as absorption/desorption contents, rates and stabilities were evaluated. The results show that the specific surface area, volume of pores from 3.7-7.1 nm and average pore diameter of activated carbon are closely nonlinearly related to the temperature rising rate, temperature and holding time. In general, the activated carbon prepared with the temperature rising rate of 5 ℃/min and kept at 1 100 ℃ for 2 h has the highest absorption/desorption content and rate, the lowest decay factor and then the best stability at all humidity for the fact that it is provided with proper average pore diameter, higher specific surface area and volume of pores from 3.7-7.1 nm. The activated carbons can be prepared with the temperature rising rate of 5 ℃/min and kept at 1000, 900,1 200, 1 300, 1 400, 1 500, 800, 700, and 600 ℃ respectively for 2 h. These resulted properties are attributed to their different average pore diameters and volumes of pores from 3.7-7.1 nm.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.60375001)the High School Doctoral Foundation of China(NO.20030532004).
文摘Control parameters of original differential evolution （DE） are kept fixed throughout the entire evolutionary process. However, it is not an easy task to properly set control parameters in DE for different optiinization problems. According to the relative position of two different individual vectors selected to generate a difference vector in the searching place, a self-adapting strategy for the scale factor F of the difference vector is proposed. In terms of the convergence status of the target vector in the current population, a self-adapting crossover probability constant CR strategy is proposed. Therefore, good target vectors have a lower CFI while worse target vectors have a large CFI. At the same time, the mutation operator is modified to improve the convergence speed. The performance of these proposed approaches are studied with the use of some benchmark problems and applied to the trajectory planning of a three-joint redundant manipulator. Finally, the experiment results show that the proposed approaches can greatly improve robustness and convergence speed.
基金Funded by the National Natural Science Foundation of China(51678442,51578412,51478348,51508404,51878480,and 51878479)the National High-speed Train Union Fund(U1534207)+1 种基金the Key project of the Shanghai Committee of Science and Technology(No.15DZ1205003)the Fundamental Research Funds for the Central Universities
文摘A self-regulating humidity material with bamboo for the room was prepared. The activated carbons were prepared with the temperature rising rates of 5, 10, 15, 20 ℃/min and constant temperatures of 600, 700, 800, 900, 1 000, 1 100, 1 200, 1 300, 1 400, and 1 500 ℃ for 0.5, 1, 2, 3, and 6 h, respectively.And then their structures such as specific surface areas, volumes of pores from 3.7-7.1 nm and average pore diameters were tested. Various humidity conditions were simulated and their self-regulating humidity properties such as absorption/desorption contents, rates and stabilities were evaluated. The results show that the specific surface area, volume of pores from 3.7-7.1 nm and average pore diameter of activated carbon are closely nonlinearly related to the temperature rising rate, temperature and holding time. In general, the activated carbon prepared with the temperature rising rate of 5 ℃/min and kept at 1 100 ℃ for 2 h has the highest absorption/desorption content and rate, the lowest decay factor and then the best stability at all humidity for the fact that it is provided with proper average pore diameter, higher specific surface area and volume of pores from 3.7-7.1 nm. The activated carbons can be prepared with the temperature rising rate of 5 ℃/min and kept at 1000, 900,1 200, 1 300, 1 400, 1 500, 800, 700, and 600 ℃ respectively for 2 h. These resulted properties are attributed to their different average pore diameters and volumes of pores from 3.7-7.1 nm.
