三维热传导型半导体器件瞬态模拟问题的Crank—Nicolson差分—流线扩散有限元法及其数值分析

本文研究三维热传导型半导体器件瞬态模拟问题的数值方法。针对数学模型中各方程不同的特点，分别提出不同的有限元格式。特别针对浓度方程组是对流为主扩散问题的特点，使用Crank-Nicolson差分-流线扩散计算格式，提高了数值解的稳定性。得到的L^2误差估计关于空间剖分步长是拟最优的，关于时间步长具有二阶精度。     

一种不等带宽光学梳状滤波器

提出了一种新型—Michelson—三面镜FabryPerot型50GHz不等带宽光学梳状滤波器设计方案,分析和模拟表明:该器件将一路信道间隔为50GHz的输入信号分离成信道间隔为100GHz的奇偶两路输出信号,其中在3dB处,奇数信道带宽大于30GHz用于10Gb/s传输,偶数信道带宽大于60GHz用于40Gb/s传输对于将来的40Gb/s系统,该器件具有优势.     

半导体激光自混频干涉式传感器中的干涉与调制

应用F-P模型，阐述了半导体激光自混频干涉式传感器的干涉与调制过程，同时给出了相应的计算．     

Harmonic beam splitter design and fabrication

Two problems of half-wave hole and high ripples in the transmittance region for a harmonic beam splitter had been pointed out and analyzed. Based on the application of a half-wavelength control and a new admittance matching methods, a harmonic beam splitter was designed and fabricated. The former method eliminated the half-wave hole fundamentally, and the latter smoothed high ripples in the transmittance region effectively. The matching stack consisted of a symmetrically periodic structure and provided a complete matching at the desired wavelength, i.e., both conditions for the equivalent admittance and phase thickness were fulfilled. Furthermore, both the theoretical and the tested curves had been given, and a good agreement between them was obtained.     

Structure and Photoluminescence of Nano-ZnO Films Grown on a Si （100） Substrate by Oxygen- and Argon-Plasma-Assisted Thermal Evaporation of Metallic Zn

Nano-ZnO thin films were prepared by oxygen- and argon-plasma-assisted thermal evaporation of metallic Zn at low temperature, followed by low-temperature annealing at 300℃ to 500℃ in oxygen ambient. X-ray diffraction patterns indicate that the nano-ZnO films have a polycrystalline hexagonal wurtzite structure. Raman scattering spectra demonstrate the existence of interface layers between Zn and ZnO. Upon annealing at 400℃ for i h, the interface mode disappears, and photoluminescence spectra show a very strong ultraviolet emission peak around 381 nm. The temperature-dependent PL spectra indicate that the UV band is due to free-exciton emission.     

神经网络自适应滤波器在故障诊断中的应用

分析了用自适应滤波器进行故障诊断的方法．针对该方法在计算上要花费大量时间、难于完成实时诊断任务的缺点，提出了用神经网络自适应滤波器来完成故障诊断的方法．神经网络有极快的运行速度，能很好地完成实时诊断任务．     

钢管单芯棒圆周剪切法的实验研究

介绍钢管圆周剪切的另一种方法－单芯棒圆周剪切法。通过运动学分析阐述了剪切金属的变形原理；实验研究证明了该方法的可行性并对切口断面质量进行了分析。     

葫芦科几种瓜类植物花粉扫描电镜的研究

本文用扫描电镜观察了11种瓜类植物花粉,其图象清晰,可供开展蜂花粉、分类鉴定及侦破工作参考。     

Interface roughness, surface roughness and soft X-ray reflectivity of Mo/Si multilayers with different layer number

A series of Mo/Si multilayers with the same periodic length and different periodic number were prepared by magnetron sputtering, whose top layers were respectively Mo layer and Si layer. Periodic length and interface roughness of Mo/Si multilayers were determined by small angle X-ray diffraction (SAXRD). Surface roughness change curve of Mo/Si multilayer with increasing layer number was studied by atomic force microscope (AFM). Soft X-ray reflectivity of Mo/Si multilayers was measured in National Synchrotron Radiation Laboratory (NSRL). Theoretical and experimental results show that the soft X-ray reflectivity of Mo/Si multilayer is mainly determined by periodic number and interface roughness, surface roughness has little effect on reflectivity.