Multi-Objective Optimization of Water-Sedimentation-Power in Reservoir Based on Pareto-Optimal Solution

A multi-objective optimal operation model of water-sedimentation-power in reservoir is established with power-generation, sedimentation and water storage taken into account. Moreover, the inertia weight self-adjusting mechanism and Pareto-optimal archive are introduced into the particle swarm optimization and an improved multi-objective particle swarm optimization (IMOPSO) is proposed. The IMOPSO is employed to solve the optimal model and obtain the Pareto-optimal front. The multi-objective optimal operation of Wanjiazhai Reservoir during the spring breakup was investigated with three typical flood hydrographs. The results show that the former method is able to obtain the Pareto-optimal front with a uniform distribution property. Different regions (A, B, C) of the Pareto-optimal front correspond to the optimized schemes in terms of the objectives of sediment deposition, sediment deposition and power generation, and power generation, respectively. The level hydrographs and outflow hydrographs show the operation of the reservoir in details. Compared with the non-dominated sorting genetic algorithm-II (NSGA-II), IMOPSO has close global optimization capability and is suitable for multi-objective optimization problems. LI Hui, born in 1981, male, doctorate student. Supported by National Science Fund for Distinguished Young Scholars (No.50725929) and National Natural Science Foundation of China (No.50539060,50679052).     

Modern travelling wave based fault location techniques for HVDC transmission lines

The modern travelling wave based fault location principles for transmission lines are ana-lyzed. In order to apply the travelling wave principles to HVDC transmission lines, the special tech-nical problems are studied. Based on this, a fault locating system for HVDC transmission lines is developed. The system can support modern double ended and single ended travelling wave princi-ples simultaneously, and it is composed of three different parts: travelling wave data acquisition and processing system, communication network and PC based master station. In the system, the fault generated transients are induced from the ground leads of the over-voltage suppression ca-pacitors of an HVDC line through specially developed travelling wave couplers.The system was applied to 500 Kv Gezhouba-Nanqiao(Shanghai)HVDC transmission line in China. Some field op- eration experiences are summarized, showing that the system has very high reliability and accu- racy,and the maximum location error is about 3 km(not more than 0.3% of the total line length). Obviously, the application of the system is successful, and the fault location problem has finally been solved completely since the line operation.     

用Lyapunov—Schmidt方法求一类方程的近似解

使用Lyapunov—Schmidt方法求出给定方程的分歧方程,解决了方程初值难取定与奇异性的问题．Newton迭代得到其在分歧点附近的近似非平凡解枝。     

两类不动点原理在微分方程解的存在性中的应用

介绍了常用的Banach压缩映像原理和Schauder不动点定理,重点讨论了它们在微分方程解的存在性定理证明过程中的具体应用,从而阐述了不动点原理的理论价值和应用价值。     

压差方程的Godunov格式

为求压差方程黎曼问题中关于压力的非线性方程的解,Godunov格式给出一个合理的初始近似值,利用Newton迭代法和一些必要的计算得到格式中的数值流.计算发现：此格式对于计算压差方程只包含强简单波的黎曼解是很好的,对于计算压差方程的包含弱简单波的数值解是不适用的.最后,文章对这种数值现象的产生做了进一步探讨.     

高职学生心理状况分析

由于自身特点,面对社会变革和竞争压力,当代高校学生存在着诸多心理问题乃至心理疾病。而高职学生作为大学生中的一个特殊群体,存在的心理问题尤为突出。基于大学生心理教育的现实,试就高职学生存在的心理问题及产生的原因予以适当分析,尝试提出解决办法和途径。     

当前教师教育课程改革中存在的问题与思考

鉴于我国教师教育课程中长期存在一些突出的问题，近年来高师院校掀起了一股教师教育课程改革的浪潮。然而，改革中出现的问题同样需要引起警惕。本文对此进行分析，并提出了针对性的解决策略。     

一类具有脉冲和时滞的细胞神经网络系统的反周期解

通过微分不等式分析技巧，得出了一类具有脉冲和时滞的细胞神经网络系统反周期解存在性和全局指数稳定性的新的充分条件，推广和改进了已有文献的相关结果。     

To globalise or not to globalise? ‘Inward-looking youth’ as scapegoats for Japan's failure to secure and cultivate ‘global human resources’

In Japan in recent years, there has been much discussion of the need for global human resources alongside criticism of Japanese youth as having an ‘inward-looking’ (uchimuki) orientation. Drawing out the contradictions apparent in a youth apparently reluctant to leave Japan and companies, universitiesand government seemingly desperate to nurture and attract global talent, this paper frames the uchimuki discourse as a cover for an insular Japan and its failure to attract and foster ‘global human resources’.As such, the two discourses shed a great deal of light on Japan's complex relationship with globalisation.     

比色分析用过期标准溶液续用方法研究

本文根据准曲线测定样品的原理,经过对过期二氧化氮标准溶液实验,论述了比色分析标准溶液过期后仍可继续使用的方法。该方法的应用解决了长期以来大量过期标准溶液废弃流失,变相浪费、损失和增加环境污染的问题,并使化验室试剂费用成本得以下降、国家物质资源得以节省。