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基于遗传算法的高强混凝土配合比优化设计 被引量:5
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作者 王继宗 卢智成 《混凝土与水泥制品》 北大核心 2004年第6期19-22,共4页
采用解决复杂优化问题的遗传算法 ,对高强混凝土进行配合比的优化设计。从成功的混凝土配合比数据中 ,归纳出各种原材料用量的取值范围 ,以混凝土材料的成本为优化目标函数。将约束优化的数学规划问题转化成遗传算法模型 ,用实数编码表... 采用解决复杂优化问题的遗传算法 ,对高强混凝土进行配合比的优化设计。从成功的混凝土配合比数据中 ,归纳出各种原材料用量的取值范围 ,以混凝土材料的成本为优化目标函数。将约束优化的数学规划问题转化成遗传算法模型 ,用实数编码表示个体的染色体位串 ,启用联赛随机选择算子、完全算术交叉算子以及非均匀变异算子等算子组合 ,完成遗传操作。编程计算并获得最优解。其结果与工程实例中提供的设计参数相比 ,减少费用18.8%。 展开更多
关键词 土木工程 混凝土配合比优化设计 材料成本最小 化遗传算法
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Design and fabrication of 1-D semiconductor nanomaterials for high-performance photovoltaics 被引量:4
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作者 Ning Han Zaixing Yang +5 位作者 Lifan Shen Hao Lin Ying Wang Edwin Y.B.Pun Yunfa Chen Johnny C.Ho 《Science Bulletin》 SCIE EI CAS CSCD 2016年第5期357-367,共11页
To date, the cost-effective utilization of solar energy by photovoltaics for large-scale deployment remains challenging. Further cost minimization and efficiency maximization, through reduction of material consumption... To date, the cost-effective utilization of solar energy by photovoltaics for large-scale deployment remains challenging. Further cost minimization and efficiency maximization, through reduction of material consumption, simplification of device fabrication as well as optimization of device structure and geometry, are required. The usage of 1D nanomaterials is attractive due to the outstanding light coupling effect, the ease of fabrication, and integration with one-dimensional(1-D) semiconductor materials. The light absorption efficiency can be enhanced significantly, and the corresponding light-toelectricity conversion efficiency can be as high as their bulk counterparts. Also, the amount of active materials used can be reduced. This review summarizes the recent development of 1-D nanomaterials for photovoltaic applications, including the anti-reflection, the light absorption,the minority diffusion, and the semiconductor junction properties. With solid progress and prospect shown in the past 10 years, 1-D semiconductor nanomaterials are attractive and promising for the realization of high-efficiency and low-cost solar cells. 展开更多
关键词 One-dimensional nanomaterials Photovoltaics Solar cells Light absorption Minority diffusion length Semiconductor junction
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