Large calculation error can be formed by directly employing the conventional Yee’s grid to curve surfaces.In order to alleviate such condition,unconditionally stable CrankNicolson Douglas-Gunn(CNDG)algorithm with is ...Large calculation error can be formed by directly employing the conventional Yee’s grid to curve surfaces.In order to alleviate such condition,unconditionally stable CrankNicolson Douglas-Gunn(CNDG)algorithm with is proposed for rotationally symmetric multi-scale problems in anisotropic magnetized plasma.Within the CNDG algorithm,an alternative scheme for the simulation of anisotropic plasma is proposed in body-of-revolution domains.Convolutional perfectly matched layer(CPML)formulation is proposed to efficiently solve the open region problems.Numerical example is carried out for the illustration of effectiveness including the efficiency,resources,and absorption.Through the results,it can be concluded that the proposed scheme shows considerable performance during the simulation.展开更多
随着线上线下融合的全渠道模式蓬勃发展,厂商相继退出线上购买线下退货的全渠道退货服务(Buy Online and Return in Store,BORS)。考虑了服务差异化与消费者异质双重影响下的全渠道退货的问题,构建同渠道退货和全渠道退货两种退货策略模...随着线上线下融合的全渠道模式蓬勃发展,厂商相继退出线上购买线下退货的全渠道退货服务(Buy Online and Return in Store,BORS)。考虑了服务差异化与消费者异质双重影响下的全渠道退货的问题,构建同渠道退货和全渠道退货两种退货策略模型,研究产品定价决策与退货策略选择,并分析服务与消费者差异性对供应链定价及退货策略的影响。研究表明,当服务水平达到一定阈值后,消费者会为全渠道退货服务承担一定溢价;供应链提供合理的差异化服务实施差异化竞争,能凸显全渠道退货优势,提升供应链利润。当服务成本低且消费者服务感知较高时,更适合采用全渠道退货策略。展开更多
介绍了旋转体时域有限差分法(BOR-FDTD),导出了电磁场迭代计算公式。给出了自适应协方差矩阵进化策略(CMA-ES)的基本原理和步骤。提出了一种基于BOR-FDTD和CMA-ES的波纹喇叭优化设计技术,并将该项技术用于平方公里阵(Square Kilometre A...介绍了旋转体时域有限差分法(BOR-FDTD),导出了电磁场迭代计算公式。给出了自适应协方差矩阵进化策略(CMA-ES)的基本原理和步骤。提出了一种基于BOR-FDTD和CMA-ES的波纹喇叭优化设计技术,并将该项技术用于平方公里阵(Square Kilometre Array,SKA)望远镜天线Band 4(2.8~5.18 GHz)波纹喇叭馈源的优化设计。计算结果表明,该馈源在工作频带内反射损耗基本在-20 d B以下,天线口径效率均优于86.5%,且口径效率随频率的变化较小。展开更多
文摘Large calculation error can be formed by directly employing the conventional Yee’s grid to curve surfaces.In order to alleviate such condition,unconditionally stable CrankNicolson Douglas-Gunn(CNDG)algorithm with is proposed for rotationally symmetric multi-scale problems in anisotropic magnetized plasma.Within the CNDG algorithm,an alternative scheme for the simulation of anisotropic plasma is proposed in body-of-revolution domains.Convolutional perfectly matched layer(CPML)formulation is proposed to efficiently solve the open region problems.Numerical example is carried out for the illustration of effectiveness including the efficiency,resources,and absorption.Through the results,it can be concluded that the proposed scheme shows considerable performance during the simulation.
文摘随着线上线下融合的全渠道模式蓬勃发展,厂商相继退出线上购买线下退货的全渠道退货服务(Buy Online and Return in Store,BORS)。考虑了服务差异化与消费者异质双重影响下的全渠道退货的问题,构建同渠道退货和全渠道退货两种退货策略模型,研究产品定价决策与退货策略选择,并分析服务与消费者差异性对供应链定价及退货策略的影响。研究表明,当服务水平达到一定阈值后,消费者会为全渠道退货服务承担一定溢价;供应链提供合理的差异化服务实施差异化竞争,能凸显全渠道退货优势,提升供应链利润。当服务成本低且消费者服务感知较高时,更适合采用全渠道退货策略。
文摘介绍了旋转体时域有限差分法(BOR-FDTD),导出了电磁场迭代计算公式。给出了自适应协方差矩阵进化策略(CMA-ES)的基本原理和步骤。提出了一种基于BOR-FDTD和CMA-ES的波纹喇叭优化设计技术,并将该项技术用于平方公里阵(Square Kilometre Array,SKA)望远镜天线Band 4(2.8~5.18 GHz)波纹喇叭馈源的优化设计。计算结果表明,该馈源在工作频带内反射损耗基本在-20 d B以下,天线口径效率均优于86.5%,且口径效率随频率的变化较小。
