非理想条件下MMC-DVR的PBC和SMC混合控制策略

动态电压调节器(DVR)与模块化多电平转换器(MMC)组合的MMC-DVR可用于解决中高电压的动态电压补偿问题。但当电网电压不平衡较大时,采用传统的PID控制或者单一的无源性控制（PBC）或单一的滑模控制（SMC）均难以很好地对动态电压进行补偿控制。为此,提出了PBC+SMC两种控制方法的混合控制方法能够很好地解决电网电压不平衡时动态电压补偿问题。首先,推导出不平衡电网下MMC-DVR的数学模型;接着,针对目前控制方法存在问题,提出了PBC与SMC的混合控制策略用于MMC-DVR的动态电压补偿,解决了单一PBC控制方法的难以精确控制、响应速度慢、补偿效果不佳等问题;最后,在实验平台上将本文的PBC+SMC控制与PBC、PID两种控制进行实验效果比较,实验结果表明,本文的MMC-DVR混合控制系统能够快速、准确地自动补偿动态电压,且该系统具有鲁棒性强、控制精度高等特点,从而验证了本文混合控制方法的有效性和优越性。     

静高压下熔态淬火Al_4Mn合金形成准晶的探讨

本文利用静高压熔态淬火的方法,对Al_4Mn合金形成准晶的压力条件及热稳性进行了研究,在0.95GPa～4.45GPa的压力范围以10~2K/s冷却速率淬火Al_4Mn合金,在不同的压力范围得到了不同结构的准晶;并利用非晶态动力学理论就压力在准晶形成中的作用进行了初步的探讨.     

The effects by γ ray irradiation on silicon photodiodes

The relationships between irradiation doses of γ ray and the main photoelectric characteristics of PIN photodiode or conventional photodiode with different structure were studied. The experimental results show that after the photodiodes being irradiated, the photocurrent decreases, especially for short wavelength of light. The dark current of the photodiodes with smaller active area decreases while increases for that with larger active area, and the response time shortens. The plane scanning experiment of laser beam indicates that the homogeneity of the device's surface is not influenced by the irradiation. The results prove that PIN photodiode shows relatively good radioresistance. Chen Bingruo: born in Dec. 1946. Associate Professor. Current research interest is in physics of semiconductor device Supported by the National Education Committee of China     

GreenCommute: An Influence-Aware Persuasive Recommendation Approach for Public-Friendly Commute Options

Negative impacts produced by transportation sector have increased in parallel with the increase of urban mobility. In this paper, we introduce GreenCommute, a novel recommendation system which can facilitate commuters to take public friendly commute options, while provide support to alleviate the external cost in society, such as traffic pollution, congestion and accidents. In the meanwhile, a rewarding mechanism for persuading commuters is embedded in the proposed approach for balancing the conflict between personal needs and social aims. The allocation of reward values also takes users’ influential degrees in the social network into consideration. Experimental results show that the GreenCommute can promote public friendly commute options more effectively in comparison to the traditional recommendation system.     

利用DDE实现VB程序自动生成Word文档

讨论了如何利用Windows DDE技术实现Visual Basic应用程序和Microsoft Word动态链接的方法,达到自动生成图文混排文档的目的.     

试论科学技术进步对经济发展的作用

分析了科学技术进步对经济发展的作用，尔后探讨了定量数学模型索洛余值法评价科学技术进步对经济增长的作用，最后提出了定量数学模型应注意的问题。     

暑期社会实践对培养高级应用型人才的作用

大学生暑期社会实践活动在学校课堂教学和教学实践环节之外对培养高级应用型人才起着不容忽视的作用．笔者根据杭工院暑期社会实践的调查来阐述这一活动对高级应用型人才的实践观、思想道德品质、专业技术能力、管理能力、毕业就业以及教学中实践环节质量提高等方面的作用．     

下岗失业人员养老保险接续问题研究

分析了我国下岗失业人员不能顺利接续养老保险的原因，主要是再就业保障的无力性、缴费保障的排斥性、身份的特殊与接续的难题和新旧体制转轨不彻底。提出应采取制度激励的方式如调节缴费分配比例；加强制度设计的灵活性；以费代税，激励企业缴纳养老保险；确保制度公正，促使集体企业下岗职工缴费等，来解决下岗失业职工的养老保险接续问题。     

Point defects in active layers of TFEL devices based on ZnS

Point defects in the active layer of a layered optimization thin film electroluminescent device of ZnS; Er³⁺ were studied. The results indicate that besides Er³⁺ substituting for Zn²⁺ as luminescent centers, the dominant point defects are sulfur vacancies, zinc vacancies, shallow donors and deep acceptors. Their influence on electroluminescence is discussed.