摘要：This paper presents a new basis, the WSB basis, which unifies the Bemstein basis, Wang-Ball basis and Said-Ball basis, and therefore the Bézier curve, Wang-Ball curve and Said-Ball curve are the special cases of the WSB curve based on the WSB basis In addition, the relative degree elevation formula, recursive algorithm and conversion formula between the WSB basis and the Bern- stein basis are given.

摘要：In the view of staff shortages and the huge inventory of products in the current market, we put forward a personnel scheduling model in the target of closing to the delivery date considering the parallelism. Then we designed a scheduling algorithm based on genetic algorithm and proposed a flexible parallel decoding method which take full use of the personal capacity. Case study results indicate that the flexible personnel scheduling considering the order-shop scheduling, machine automatic capabilities and personnel flexible in the target of closing to the delivery date optimize the allocation of human resources, then maximize the efficiency.

摘要：为了快速有效地验证主动悬架的控制算法,提出了一种主动悬架硬件在回路实时仿真平台。在Matlab/Simulink中建立了主动悬架的动力学模型、作动器模型,以S3CEEBO芯片为中央处理器,设计了主动悬架实际控制器,在此基础上搭建了该硬件在回路实时仿真平台。针对某款汽车运用不同的控制算法进行了仿真实验。结果表明,该硬件在回路仿真平台可以对主动悬架的各种控制算法的执行效果进行验证。

摘要：对一类具有时变时滞的不确定随机系统的脉冲控制进行研究.利用Lyapunov函数和Razumikhin型技巧得到系统基于线性矩阵不等式形式的鲁棒均方稳定性判据,该判据表明适当的脉冲可以用来镇定不稳定的随机时滞系统.在稳定性分析的基础上,进一步给出脉冲控制律的具体设计方法.数值例子及仿真证明了本文方法的有效性和优势.

摘要：提出了一种新颖的求解约束问题的群智能优化算法.该算法模拟杂草克隆、占地生长与繁殖的自然行为,具有入侵性杂草的鲁棒性、适应性和随机性等特点,算法简单而有效,具有准确的全局搜索能力.结合罚函数方法将提出的算法应用于求解工程设计优化问题,实验结果及比较表明提出的算法获得了更优的结果,同时也显示了它在求解复杂工程设计优化问题时的全局寻优能力.进一步实验与统计分析了关于参数选择对算法性能的影响,得到了有利参数选择的结论.

摘要：背景:银基复合材料是一种常见的电接触材料,具有良好的导电导热性能;而二硫化钼是一种重要的固体润滑材料,具有良好的减摩润滑性能。因此考虑把二硫化钼添加到银基体材料中,以制备适用于滑动电摩擦磨损过程的复合材料。目的:制备不同含量配比的银-二硫化钼复合材料,通过对其力学性能以及电摩擦磨损性能的比较,得到最佳含量组成的复合材料。设计、时间及地点:观察对比实验,于2008-04/05 在合肥工业大学材料科学与工程学院完成。材料:银粉由蚌埠金银饰品厂提供,二硫化钼粉由国药化学试剂有限公司提供。方法:采用粉末冶金方法,经配料、烘干、混料、初压、烧结、复压等过程,制备二硫化钼含量为 12.0%,13.5%,15.0%,16.5%,18.0%的银-二硫化钼复合材料。主要观察指标:利用万能力学实验机对材料的抗弯强度进行测试,光学显微镜观察其烧结过后的组织形貌;使用自制的电磨损试验机对试样进行电摩擦磨损实验,并用扫描电子显微镜对试样磨损表面进行观察分析。结果:随着复合材料中二硫化钼含量的增加,材料的抗弯强度下降,电阻率升高,磨损率先降低后升高,在二硫化钼含量为 15%时材料的磨损量最低。结论:二硫化钼含量在 15%时综合性能指数最佳。

摘要：将不同金属元素通过合金化形成二维材料(金属烯)对基础研究和纳米电子器件的实际应用具有重要意义,但目前鲜有金属烯材料是具有本征带隙的半导体.受离子晶体成键特征的启发,通过结构搜索、成键分析和高通量第一性原理计算,本文从2500多个双金属烯中筛选出一系列具有晶格动力学稳定和碱金属-金离子键的二维碱金属金化物双金属烯半导体.由于碱金属和金之间的大电负性差,其中32个碱金属金化物双金属烯是带隙范围为0.97~5.20 eV的半导体材料,而锂金双金属烯由于电负性差减小呈现出金属性.Bohn-Oppenheimer分子动力学模拟表明19个双金属烯在室温下结构稳定有利于实际应用.这项研究为设计双金属烯半导体提供了指导,并揭示了二维金属合金中成键行为和电子结构性质间的关联.

摘要：A new method to the problem of fairing planar cubic B-spline curves is introduced in this paper. The method is based on weighted progressive iterative approximation （WPIA for short） and consists of following steps： finding the bad point which needs to fair, deleting the bad point, re-inserting a new data point to keep the structm-e of the curve and applying WPIA method with the new set of the data points to obtain the faired curve. The new set of the data points is formed by the rest of the original data points and the new inserted point. The method can be used for shape design and data processing. Numerical examples are provided to demonstrate the effectiveness of the method.

摘要：为提高三相异步电机在轻载和空载运行时的功率因数与机械效率,提出运用智能遗传算法对功率因数和机械效率进行综合优化,算法借助于正交表试验设计和智能型交配运算等步骤,改善遗传算法的性能。仿真结果表明基于智能遗传算法的异步电机功率因数和机械效率综合优化,方法简单、有效,能明显提高功率因数和机械效率,提高节能控制效果,提高优化精确度和计算速度。

摘要：The energy crisis and global warming become severe issues. Solar-driven CO2 reduction provides a promising route to confront the predicaments, which has received much attention. The photoelectrochemical（PEC） process,which can integrate the merits of both photocatalysis and electrocatalysis, boosts splendid talent for CO2 reduction with high efficiency and excellent selectivity. Recent several decades have witnessed the overwhelming development of PEC CO2 reduction. In this review, we attempt to systematically summarize the recent advanced design for PEC CO2 reduction. On account of basic principles and evaluation parameters, we firstly highlight the subtle construction for photocathodes to enhance the efficiency and selectivity of CO2 reduction, which includes the strategies for improving light utilization, supplying catalytic active sites and steering reaction ***, diversiform novel PEC setups are also *** exploited setups endow a bright window to surmount the intrinsic disadvantages of photocathode, showing promising potentials for future applications. Finally, we underline the challenges and key factors for the further development of PEC CO2 reduction that would enable more efficient designs for setups and deepen systematic understanding for mechanisms.