全内反射型半导体光波导开关器件模型分析

本文提出了一种简便可行的全内反射交叉型半导体光波导开关模型分析方法。该方法采用波动光学的原理,分析了全内反射型(TIR)开关中导波模式的传输和反射特性,采用反射率和透射率计算了开关的消光比、串话、损耗等性能与波导结构参数之间的关系,并考虑了波导吸收系数对开关性能的影响。对全内反射条件下Coos-Haenchen位移也做了讨论。中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)004233-24

Ceo Overconfidence, Power Configuration and Stock Price Crash Risk

基于沪深两市2006—2013年A股上市公司的面板数据,本文从行为金融视角出发考察了CEO过度自信心理特征及其权力配置对股价崩盘风险的影响。研究发现CEO过度自信会增大公司股价崩盘风险;并且,随着CEO权力增大,过度自信更容易导致公司股价崩盘现象发生。进一步将CEO权力细分为选择权和决断权之后发现,只有CEO决断权增大能显著加剧过度自信对股价崩盘风险的负面影响,且这一关系只有在选择权得到保证后成立。From the perspective of behavioral finance, this paper studies the impact of CEOs＇ overcon- fidence, CEOs＇ power and its configuration on stock price crash risk based on the 2006--2013 panel data of a-share companies listed in Shanghai Securities Exchange and Shenzhen Securities Exchange. Empirical evi- dence shows as follows. First, CEO＇s overconfidence increases the stock price crash risk. Second, the o- verconfidence is more likely to lead to share price collapse with the increase of CEOs＇ power. Third, after further subdividing the CEOs＇ power into decision power and choice power, we found that it＇s the CEO＇s decision power rather than choice power plays the main role on moderating the relationship between CEO overconfidence and stock price crash risk. While, even with the large decision power, CEO＇s overconfi- dence can＇t aggravate the negative effect on stock price cash risk with the restriction of choice power.教育部规划基金项目(15YJA630093)；浙江省自然科学基金面上项目(LY15G020002)；国家自然科学基金项目(71572165；71502166；71272011)；国家社科基金重点项目(13AGL002)；浙江省高校社科重点研究基地(浙江工商大学工商管理学科)重点项目(JYTgs20151301)的资助

GaAs/GaAlAs双异质结光波导开关内带隙的注入载流子感生变化

本文研究了ＧａＡｓ／ＧａＡｌＡｓ双异质结光波导开关内波导层带隙的载流子注入感生变化．给出了带隙变化值随注入载流子浓度变化的关系曲线，并与带填充理论和带隙收缩理论的计算结果进行了对比分析．中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)007455-45