广角无限视景显示系统后投射屏的设计与研究

根据球面反射镜成像理论,利用改变光轴的方法,推导出了广角无限视景显示系统后投射屏面形的计算公式,完成了后投射屏最佳面形的设计。对后投射屏外表面散射层的材料和厚度进行了探讨,给出了最佳的选择方案。首次通过热吹模具成型法研制了高精度的整体投射屏。通过试验验证,该投射屏满足设计要求。使用该投射屏的广角无限显示系统具有图像清晰、视场角大、纵深感强等优点,同时观察者的视点还可在一定的出瞳范围内移动。     

关于热阴极微波电子枪中电子反轰问题的研究

 提出了热阴极微波电子枪的设计中可以通过缩短腔长减小电子反轰功率，并通过模拟计算详细研究了腔长对电子反轰及枪出口束流品质的影响。     

Simulation analysis of the effects of a back surface field on a p-a-Si:H/n-c-Si/n+-a-Si:H heterojunction solar cell

In order to investigate the effects of a back surface field（BSF） on the performance of a p-doped amorphous silicon（p-a-Si：H）/n-doped crystalline silicon（n-c-Si） solar cell,a heterojunction solar cell with a p-a-Si：H/n-c-Si/n^＋-a-Si：H structure was designed.An n^＋-a-Si：H film was deposited on the back of an n-c-Si wafer as the BSF.The photovoltaic performance of p-a-Si：H/n-c-Si/n^＋-a-Si：H solar cells were simulated.It was shown that the BSF of the p-a-Si：H/n-c-Si/n^＋-a-Si：H solar cells could effectively inhibit the decrease of the cell performance caused by interface states.     

Packaging technology of LEDs for LCD backlights

traditional package method of a yellow phosphor with a blue chip. However, its light efficiency needs to be further improved for the use of backlights for LCDs.     

隧道围岩反分析与施工数值模拟

结合殷家岩隧道施工,对隧道围岩进行了位移反分析,得到了围岩松动区的弹性模量;应用反分析结果进行数值模拟,预测后续施工步的位移和应力;同时,将预测结果与现场观测进行比较,检验反分析结果。结果表明,利用反分析得到的围岩参数预测后续施工步的位移与现场观测结果比较吻合。     

基于EMD-GA-BP与EMD-PSO-LSSVM的中国碳市场价格预测

由于碳交易市场价格的波动性大及相互影响关系的复杂性,本文试图构建碳价格长期和短期的最优预测模型。考虑到碳交易价格波动的趋势性和周期性特点,基于经验模态分解算法(EMD)、遗传算法(GA)—神经网络(BP)模型、粒子群算法(PSO)—最小二乘支持向量机(LSSVM)模型及由它们构建的组合预测模型,对中国碳市场交易价格进行短期预测和长期预测。实证分析中将影响碳交易价格的不同宏观经济因素和碳价格时间序列因素做为输入变量,分别代入组合模型进行预测。研究结果表明,在短期预测中,EMD-GA-BP模型预测效果优于GA-BP模型和PSO-LSSVM模型;而在长期预测中,组合模型EMD-PSO-LSSVM模型预测效果优于只考虑碳价格波动趋势性或周期性预测效果。     

基于回购契约的风险厌恶零售商的供应链协调

研究了由风险中性的供应商和风险厌恶的零售商组成的二级供应链协调问题.零售商的风险厌恶由CVaR来度量,研究表明：零售商的风险厌恶加剧了双重边际效应,恶化了供应链效益.为了实现供应链的协调,供应商提出回购契约以减轻零售商的风险顾虑引导其增加订货量,结果表明：当零售商的风险厌恶超过了一定的程度,回购契约不能实现供应链协调;当供应链可以通过回购契约实现协调时,供应链的协调利益可以在供应商和零售商之间进行任意的分配,具体的分配结果取决于他们的讨价还价能力.     

A short walk through quantum optomechanics

This paper gives a brief review of the basic physics of quantum optomechanics and provides an overview of some of its recent developments and current areas of focus. It first outlines the basic theory of cavity optomechanical cooling and gives a brief status report of the experimental state‐of‐the‐art. It then turns to the deep quantum regime of operation of optomechanical oscillators and covers selected aspects of quantum state preparation, control and characterization, including mechanical squeezing and pulsed optomechanics. This is followed by a discussion of the “bottom‐up” approach that exploits ultracold atomic samples instead of nanoscale systems. It concludes with an outlook that concentrates largely on the functionalization of quantum optomechanical systems and their promise in metrology applications.     

基于一种NAND闪存页缓存器设计的C/F读取算法研究

为减小共源线噪声对NAND闪存读可靠性的影响,设计了一种可实现C/F（Coarse/Fine）读取操作的页缓存器电路,并设计实现了适用于此电路的C/F读取算法,显著减小了共源线噪声.该算法通过两次子读感应读取存储单元,在第一次子读感应中分辨出阈值电压较低的存储单元并标记在页缓存器中,使其不再进行第二次子读感应,从而减小共源线噪声引起的阈值偏移.电路仿真计算表明,该支持C/F读取算法的页缓存器结构能够减小阈值偏移至少495.6mV,有效提高了NAND闪存读操作的精确性.     

Characteristics of DC magnetron sputtered ternary cobalt-nickel silicide thin films for ultra shallow junction devices

Ternary cobalt-nickel silicide thin films were synthesized by DC magnetron sputtering from an equiatomic cobalt-nickel alloy target. Grazing incidence XRD, Rutherford back scattering, high-resolution cross-sectional TEM analysis and electrical study were carried out to investigate the formation of silicide, stoichiometry, film thickness, depth profile and sheet resistance of as-deposited and post-deposition annealed films. The ternary silicide layer thickness was calculated from RBS simulated data, which was found to vary 20-43 nm for as-deposited and different vacuum annealed films. A minimum value of sheet resistance 2.73 Ω/sq corresponding to a resistivity of ∼8.4 μΩ-cm was obtained for optimized deposition and annealing conditions.