组织学生参加化工原理课程竞赛的体会和思考

本文简单介绍了2010年北京地区普通高等学校巴斯夫杯化工原理课程竞赛的程序,详细介绍了参加竞赛对我校学生动手能力、团队合作精神、特别是相关课程学习兴趣的影响。参赛也发现了我校学生在本课程的学习和实验环节中存在提高的空间。     

基于局部协同与竞争变异的动态多种群粒子群算法

针对粒子群算法在处理复杂优化问题时,出现多样性较差、收敛精度低等问题,提出了基于局部协同与竞争变异的动态多种群粒子群算法(Dynamic Multi-population Particle Swarm Optimization Based on Local Cooperative and Competitive M utation,LC-DM PPSO).LC-DM PPSO算法设计了一种局部协同的方法,该方法划分种群成多个子种群,划分后的子种群再通过非支配排序、差分变异的方法选择出一对领导粒子.同时,对粒子的更新方法进行改进,让各个目标优化更加均衡,增强LC-DM PPSO算法的局部搜索能力,提高收敛精度.在LC-DM PPSO算法中,为了防止出现"早熟"收敛的情况,引入竞争变异来增加种群多样性.最后,通过选择一系列标准测试函数将LC-DM PPSO算法与3种进化算法进行比较,验证所提算法的有效性.实验结果显示,所提算法的多样性和收敛性比其他3种进化算法更好,优化效果更佳.     

Durana,Albania: A Field of Possibilities

Durana is a disjointed metropolitan area that sprang up between Albania's two main cities Tirana and Durrës after the fall of communism. A government-run competition in late 2014 sought ideas for improvements to public space in the region. Here, Ambra Fabi and Giovanni Piovene of PIOVENEF ABI – part of a multidisciplinary team that supplied one of the winning proposals – set out their vision, which works at multiple scales from masterplanning to individual architectural interventions.