摘要：Water distribution Systems (WDSs) design and operation are usually done on a case-by-case basis. Numerous models have been proposed in the literature to solve specific problems in this field. The implementation of these models to any real-world WDS optimization problem is left to the discretion of designers who lack the necessary tools that will guide them in the decision-making process for a given WDS design project. Practitioners are not always very familiar with optimization applied to water network design. This results in a quasi-exclusive use of engineering judgment when dealing with this issue. In order to support a decision process in this field, the present article suggests a step-by-step approach to solve the multi-objective design problem by using both engineering and optimization. A genetic algorithm is proposed as the optimization tool and the targeted objectives are: 1) to minimize the total cost (capital and operation), 2) to minimize the residence time of the water within the system and 3) to maximize a network reliability metric. The results of the case study show that preliminary analysis can significantly reduce decision variables and computational burden. Therefore, the approach will help network design practitioners to reduce optimization problems to a more manageable size.

摘要：A 28 V-half-regulated power bus topology and an integrated PCDU (Power Conditioning and distribution Unit) were adopted to meet the energy demand for the Chang'e 4 relay *** paper first introduces the mission features and composition of the PSDS (Power Supply and distribution System) for the Chang'e 4 relay *** to this satellite's unusual orbit,operational mode and project restrictions,special analysis and design was conducted on the PSDS from the perspective of weight-reduction,power management,and reliability and so *** low temperature storage of SA (Solar Array) was considered and how the antenna affects the SA was analyzed.A new kind of high-specific-energy 45 Ah (Ampere-hour) battery cell was used for the first *** make sure that the satellite would successfully pass the long shadow zones,a 100% DOD (Depth of Discharge) experiment was carried out on the *** the sunlight is almost always available and there are very few times for the battery to charge or discharge,battery care to extend its lifetime is also *** is a device that integrates power conditioning and power distribution in one *** PCDU on Chang'e 4 relay satellite can output more power with less weight because of the adoption of a 28 V-half-regulated power bus topology which was also used for the first time and used lighter material for its mechanical *** under low temperature on PCDU was conducted as well and a hot backup equalizing charge technique which is beneficial to keep performance of the battery is *** power distribution module,which is a module of PCDU,enhances the power utilization security by utilizing a static impedance measurement and build-in-test to avoid possible short *** for EED (Electrical Explosive Device) module,a protection plug was specially designed and three switches with different functions were connected in series to prevent the EED from exploding by *** addition,the allowable

摘要：为了有效评价测量响应中不确定性对结构参量识别结果的影响,提出一种基于λ概率密度函数(Probability distribution function,PDF)和一次二阶矩的不确定性计算反求方法。采用二次衍生λ-PDF对待识不确定性参量的PDF进行建模。内层通过对参量呈λ-PDF的功能函数采用一次二阶矩法进行正问题求解,得到计算响应的概率分布;外层通过最小化测量响应与计算响应之间的概率分布特征量将不确定性反问题转化为确定性的最优化问题,并用隔代映射遗传算法识别未知参量λ-PDF的参数。本方法不仅有效地实现了结构未知参量PDF的估计,而且与传统基于抽样的统计方法相比,计算效率较高。数值算例和工程应用验证了本方法的可行性和有效性。

摘要：压电半导体具有压电效应和半导体电学特性,可以用于压电电子学器件和压电光电子学器件.压电电子学器件和压电光电子学器件利用外加应变产生的压电电荷调控压电电子学pn结、金属半导体(M-S)接触的载流子传输、分离、复合等过程.压电电子学器件具有灵敏度高、响应速度快和功耗超低的优点,非常适合在自驱动系统中应用,因此在物联网、可穿戴系统、植入式传感系统具有巨大的应用价值.压电电荷的分布宽度能够显著影响压电电子学器件的传感性能,是压电电子学器件重要参数之一.压电电荷的分布宽度则可以通过压电电子学器件的电容电压(C-V)特性获得.本文以压电电子学金属-绝缘体-半导体(MIS)晶体管为例,提出对压电电荷分布影响进行测量和计算的理论模型,并进行了数值模拟,为以C-V测量为基础的结区压电电荷分布宽度实验设计给出了可行的理论方案.

摘要：结合水厂工程的特点,介绍了电涌保护器在水厂低压配电系统中的应用,并结合国内现行的规范及国内外有关的资料文献,对SPD的安装位置等问题进行了分析说明。

摘要：可靠性分配是把系统要求的可靠性指标分配给分系统、部件、元件的过程。可靠性分配本质上是一个工程问题，需要考虑的因素都是一些不定因素（尤其是在系统的设计早期阶段），很难用确切的数学语言来描述。即在系统的可靠性方面，我们所获得的各分系统、各部件的有关信息是不完全、不甚确切的。也就是说，这些信息是“灰色”的。本文首先运用灰色系统理论对各分系统进行综合评估，然后在此基础上进行可靠性分配。我们把这种方法称为系统可靠性指标的灰色评估分配法。该方法可以把许估者的分散信息归纳成确切的评估值，较好地解决了在研制的早期阶段，由于对系统的认识不足而带来的问题。

摘要：为有效解决主动配电网中电压波动问题,研制了基于TMS320F2812实现的30kVA动态电压恢复器。设计了主电路、DSP电路、电压电流测量电路、PWM驱动电路和故障保护电路。主电路功率器件采用智能功率模块PM300DVA120,为提高测量精度,采用可实现6通道同时采样的16位A/D芯片AD7656。基于同步参考坐标理论的电压定向控制策略,可实现输出补偿电压的同相反相控制。开关频率10kHz,死区时间5μs的稳态和暂态实验结果表明,所研制的DVR系统具有良好的动静态响应性能。此DVR系统可用于对电压稳定要求较高的主动配电网系统。

摘要：基于立式水电机组的导轴承特点,详细介绍了油膜压力分布计算公式的推导过程、无量纲化过程及离散过程。在计算油膜压力分布时考虑了温粘效应,介绍了油膜温度分布的计算方法,给出了考虑油膜温度分布情况下油膜压力分布计算软件的实现算法,设计了油膜压力分布计算软件并给出了计算结果,可为解决水电机组轴承间隙调整和轴瓦支承的寿命预测提供数据基础。

摘要：通过对虹桥交通枢纽配电系统的典型案例分析,建立了系统的阻抗模型。借助于阻抗扫描方法,详细讨论了谐波抑制策略下谐波对于配电系统影响的定量分析。进而总结出对于该类建筑具有普遍适用的设计对策和方法。

摘要：在电力体制改革下进行增量配电业务投资利益分析,提高电力企业的盈利能力,提出一种基于主成分回归分析的电力体制改革下增量配电业务投资利益博弈和平衡模型。以资产负债率、利润增长率、现金流比率、销售净利率等参数为初始财务指标,构建电力体制改革下增量配电业务投资利益博弈的控制解释变量,采用主成分分析方法进行增量配电业务投资利益博弈建模,结合相关性检验分析方法进行回归分析,建立检测统计量模型,结合Logistics回归分析方法进行电力体制改革下增量配电业务投资利益博弈均衡控制,实现投资利益的均衡分配。实证分析结果表明,采用该模型进行电力体制改革下增量配电业务投资利益博弈的均衡调度性较好,提高了投资收益。