Taobao:The Overlord of E-Commerce in China

With the rapid development of Internet in China during the recent years, the number of Internet users is growing at high speed every year. Flourishing e-commerce in China market has provided a new market and numerous opportunities for merchants. Taobao precisely took up this vital point and had to leap to the top of e-commerce in China with so many competitors. This article will analyze the factors of Taobao’s success, its market positioning, e-payment from the perspective of the economics. As well give some suggestions on further development.     

碳中和目标下我国能源发展战略探讨

2020年国家主席习近平在第7 5届联合国大会一般性辩论上作出了力争2030年前实现碳达峰、2060年前实现碳中和的承诺。作为世界最大的能源消费国和碳排放国,实现碳中和目标对我国能源和经济可持续发展提出了更高要求。近年来,虽然我国能源消费增速放缓,碳排放逐渐进入平台期,但我国能源消费结构中化石能源占比仍高达80%以上。碳中和目标下,在借鉴发达国家调整能源消费结构与碳减排做法的基础上,如何加快我国能源转型,明确碳中和目标下能源转型的战略路径值得深入探讨。碳中和是我国经济社会发展的战略目标,也是推进我国能源革命的重要举措,更是实现文明跨越的重要抓手。在实现碳中和的道路上,我国需要在电力、工业、建筑、农业等领域不断努力,减少碳排放量,谋划最优的战略路径,努力实现碳减排和经济发展并行不悖。     

战略性新兴产业核心能力形成机理研究-以中国新能源汽车产业为例

核心能力是构筑战略性新兴产业竞争力的基石,本文基于综合优势理论思想,运用解释性案例和专利计量嵌入相结合的研究方法,通过对中国新能源汽车产业发展历程的回顾,揭示基于主导优势的战略性新兴产业核心能力形成机理。研究表明,伴随产业主导优势经历碎片化网络、单一辐轴网络到多中心小世界网络的动态演化,产业核心能力依次从小生境产品模仿创新能力、产品系列化自主开发能力到全面拓展的产业协同创新能力,二者共同进化,并且与产业综合优势同步发展,在创新驱动力、需求拉动力和政策引导力三重动力作用下实现战略性新兴产业主导优势特色不断升级和核心能力的持续积累。本研究旨在为战略性新兴产业核心能力培育和基于核心能力的综合优势战略管理提供理论指导和决策参考。     

Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions

This paper presents a unified positive-and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator(DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back(BTB) PWM voltage source converter(VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency,and the two proposed control targets for the rotor-side converter are alternatively achieved,which,as a result,improve the fault-ride through(FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid-and rotor-side converters included is designed. Finally,simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results.     

Matlab在概率统计教学中的应用浅析

概率论与数理统计作为大学一门重要的基础课程,知识抽象不易理解,同时计算量较大。利用Matlab强大的数值计算和可视化能力,有助于在有限的学时内更好地讲清概率统计的概念和应用。本文简介了通过MATLAB解决概率统计一些常见问题的方法,展示了Matlab在教学过程中的作用,并通过一个在信号处理前沿领域的综合应用表明了概率统计理论和Matlab结合的强大效果。     

组织文化类型对员工创新行为的作用机理研究

员工创新行为的实现需要环境的支持与个体的努力,文章根据计划行动理论,以个体创新信念为中介,研究组织文化与员工创新行为的关系。首先借助内部整合和外部适应两个维度,将组织文化分为高聚合型、市场导向型、中庸型和层级型等四种不同类型,并在此基础上探讨和分析不同类型的组织文化,通过员工创新自我效能感为中介,对员工创新行为的影响机理。以企业为调查样本,取得有效问卷497套,采用回归与方差分析方法对假设进行验证。研究结果显示:组织文化与员工创新行为存在正向相关关系,员工创造力自我效能感在两者关系中起中介效应;且不同类型的组织文化对员工的创新行为和创造力自我效能感的影响存在显著差异。     

Stability analysis for switched genetic regulatory networks: An average dwell time approach

In this correspondence, the problem of exponential stability for switched genetic regulatory networks (GRNs) with time delays is investigated. The GRNs are composed of N modes and the network switches from one mode to another. By employing the piecewise Lyapunov functional method combined with the average dwell time approach and by using a novel Lyapunov–Krasovskii functional (LKF), sufficient criteria are given to ensure the exponential stability for the switched GRNs with constant and time-varying delays, respectively. These criteria are proved to be much less conservative than the most recent results, since the results reported in this paper not only depend on the delay bounds, but also depend on the partitioning. All the conditions presented here are in the form of matrix inequalities which are easy to be verified via the Matlab toolbox. Two examples are provided in the end of this paper to illustrate the effectiveness of the obtained theoretical results.     

感受英国教育——一个中学生在英国学校的所历所思

根据在英国中学短期就读的经历，简单介绍英国的教育体制、普通中学的课程设置和教学方法。通过亲身体验比较中英中学教育，对目前中学教育进行思考并提出一些建议。     

王佐良翻译观在《雷雨》反问句翻译中的体现

王佐良先生翻译的《雷雨》英译本紧扣原作情节,语言灵活自然、准确把握人物内心和性格的丰富性,有效＂还原＂原作思想感情和艺术魅力。原著中大量反问句既有丰富内涵又有特色的语言,王先生娴熟地运用他精湛的三大翻译思想：文化意识、神似和读者至上,从而在英译本中尽显原作精髓和魅力。     

基于机车故障诊断的电路图形的动态显示的研究

在分析了巩车电路的特点基础上,选择了电路的通断信号对电路进行状态描述,采用了基于故障树的专家系统的故障诊断方法,设计并实现了整套的故障诊断系统以及电路图形的动态显示。实验结果证明该故障诊断系统方案是可行的,动态显示电路的设计是有效的.