A Study on the Agency Cost of the State-owned Enterprises in China—— based on the Case of CHALCO and WQLD

社会经济的发展推动了委托代理关系的演变，传统的、单一的资本所有者与企业经营者之间的委托代理关系已发展为现代企业制度下复杂的、多层次的委托代理关系。委托代理关系越发展，其中代理成本的影响就越错综复杂，其制约代理关系运行的作用就愈发明显。在现代企业制度下，我国国有企业由于其特殊的性质，不仅面临股东与管理层之间传统的委托代理问题，还面临控股股东与中小股东之间、股东与债权人之间诸多的委托代理问题，代理成本成为制约国有企业发展的重要因素。 2013年12月9日，中国财经网爆出标题为“铝业冰与火：中铝巨亏，民企大赚”的新闻。中铝这一曾经的铝业巨头巨额亏损，而同样遭遇行业寒冬的民营企业魏桥却获得可观的利润...Social and economic development change the principal-agent relationship. Under the modern enterprise system, companies face a complicated and multi-level principal-agent relationship. So, the state-owned enterprises in china not only face the traditional principal-agent problems between shareholders and managers, but also face the principal-agent problems between controlling shareholders and small...学位：会计硕士院系专业：管理学院_会计硕士学号：1752013115118

外加电场下垂直腔面发射激光器的偏振转换电流（英文）

计算了作用在垂直腔面发射激光器(VCSEL)的上面的分布喇格反射镜(DBR)上的外加电场产生的双折射，并在此基础上通过对自旋反转模型(SFM)的修正，得到面发射激光器在外加电场存在时的偏振转换电流

缀饰激子在半导体微腔中的辐射

建立了半导体微腔的缀饰激子模型。在VCSEL器件量子阱中的激子首先通过内电磁场与腔耦合,形成缀饰态。而后作为多粒子过程,缀饰激子与腔内真空场耦合产生辐射。通过QED方法,得到偶极子辐射密度方程和系统能量衰变方程

Geometrical scaling law for laser-induced micro-projectile impact testing

Laser-induced micro-projectile impact testing (LIPIT) is a useful experimental method for exploring the dynamic behavior of materials at microscale. It has been a key issue to obtain a scaling law of launch velocity of LIPIT to simplify experimental design and improve experimental configuration. This paper obtains a geometrical scaling law of launch velocity for LIPIT with relative thick metallic film (30-80 mu m thick aluminum) using dimensional analysis, experimental measurements, and numerical simulations. Firstly, the dimensional analyses of LIPIT with and without elastomer film configuration are performed, and the dimensionless parameters controlling the launch velocity of the micro-projectile are deduced, from which the geometrical scaling laws of launch velocity for the LIPIT are obtained. Then, the numerical simulation models of the LIPIT are established and validated by LIPIT experimental results, providing a numerical validation for the geometrical scaling laws. In addition, the influences of the dimensionless parameters on the dimensionless launch velocity of micro-projectiles are analyzed by numerical simulations, and the dimensionless formulas for predicting the launch velocities of micro-projectiles in a LIPIT are given, providing an effective method for analyzing and optimizing the LIPIT experiments