摘要：Given the demand for constantly scaling micro- electronic devices to ever smaller dimensions, a SiO2 gate dielectric was substituted with a higher dielectric-constant material, Hf（Zr）O2, in order to minimize current leakage through dielectric thin film. However, upon interfacing with high dielectric constant （high-κ） dielectrics, the electron mobility in the conventional Si channel degrades due to Coulomb scattering, surface-roughness scattering, remotephonon scattering, and dielectric-charge trapping.Ⅲ-Ⅴ and Ge are two promising candidates with superior mobility over Si. Nevertheless, Hf（Zr）O2/Ⅲ-Ⅴ（Ge） has much more complicated interface bonding than Si-based interfaces. Successful fabrication of a high-quality device critically depends on understanding and engineering the bonding configurations at Hf（Zr）O2/Ⅲ-Ⅴ（Ge） interfaces for the optimal design of device interfaces. Thus, an accurate atomic insight into the interface bonding and mechanism of interface gap states formation becomes essential. Here, we utilize first- principle calculations to investigate the interface between HfO2 and GaAs. Our study shows that As--As dimer bonding, Ga partial oxidation （between 3＋ and 1＋） and Ga- dangling bonds constitute the major contributions to gap states. These findings provide insightful guidance for optimum interface passivation.

摘要：介绍了电荷感应法在粉尘浓度测量中的应用,提出了用交变电场中传感器感应电压来表征粉尘浓度的测量方法,并进行了理论推导.在此基础上,设计了圆柱形传感器,并搭建了浓度检测试验平台,进行了模拟试验研究.试验结果表明：此装置可用于粉尘浓度为0.81～1.99g/m3的测量环境,其测量值与实际值的平均误差为1.8％.

摘要：该文针对严反馈非线性系统在Backstepping算法下进行优化。通过引入一个新的坐标变换,选择不同于传统反推控制算法的虚拟控制量。基于Backstepping的设计框架,逐层设计出了系统的虚拟控制律,继而推出实际的控制器。根据Lyapunov稳定性理论分析,系统各状态满足全局渐进稳定。最后对一个三阶的严反馈非线性系统进行数值仿真,发现系统在参考输入下,跟踪误差满足全局渐进稳定,并且相对于传统的反推控制算法,系统的收敛速度提高。证明了该方法可以提高系统的实时性。

摘要：微波作为一种新型的清洁能源广泛地应用于食品、化工、冶金和污水处理等众多领域。微波加热与传统加热相比具有选择性加热、体加热和清洁加热等优势。然而在微波加热过程中存在加热不均匀的弊端,双频加热是实现微波均匀加热强有力手段,但是双频之间的相互耦合削弱了微波加热的效率。本文基于有限元算法的COMSOL Multiphysics仿真软件建立了一个双端口天线馈电的加热模型,通过双频加热提高了微波加热的均匀性,通过两个窄带单频天线的设计减小了端口之间的相互耦合,在提高均匀性的同时保证了加热效率。

摘要：介绍了燃气辐射加热技术在耐火材料干燥中的应用,探讨了燃气辐射加热装置的设计,对燃气辐射干燥窑进行了测试,研究了干燥窑内部的温度分布,对燃气辐射加热和电辐射加热进行经济性比较。