Thermal Analysis and Surface Texture of Silicon-based Micromachined Infrared Emitter

红外光源是NDIR（Non-DispersiveInfrared）气体传感系统中的核心部件，相比其他红外光源，由MEMS（Micro-ElectromechanicalSystems）工艺所制备的硅基红外光源具有体积小，能耗低，调制频率高的特点，在微型气体传感器中具有难以取代的优势，在近年来成为了研究的热点。 本文在实验室已有红外光源的基础上进行改良分析。论文的主要内容包含以下两个部分：硅基红外光源的热电模拟分析和改进设计；提高光源辐射率的研究。 结合理论分析，本文着重对平面式薄膜结构的硅基红外光源进行了模型分析，该模型延续了薄膜结构的优点，使用SOI硅片为基底，SOI晶片上的单晶硅层通过...Infrared emitter is a key component in the NDIR (Non-Dispersive Infrared) gas detection system. Compared with other infrared emitters employed, the silicon based micromachined infrared emitter fabricated by MEMS (Micro-Electromechanical Systems) technology has its merits of small in size, low energy consumption, and fast modulation frequency. The silicon based infrared emitter has been paid great ...学位：工学硕士院系专业：物理与机电工程学院机电工程系_精密仪器及机械学号：1992007115116

MEMS Infrared Emitter Based on SOI Wafer

提出了一种利用微机电系统(MEMS)制造工艺技术制备的硅基微型红外光源。该光源使用绝缘体上硅(SOI)晶片作为基底材料,其上沉积多晶硅材料并通过离子注入工艺实现材料的电阻加热发光特性,SOI晶片上的单晶硅层通过重掺杂实现辐射光背向吸收自加热效应。利用SOI晶片中的掩埋二氧化硅层为刻蚀停止层,通过背面深反应离子刻蚀(drIE)技术制备微米量级的薄膜发光层结构。光源表面工作温度和辐射光谱分别通过红外热像仪和光谱辐射计测量得到。实验结果表明,该光源在表面温度约700 k时,1.3--14.5μM波长内的能量转换效率约为5.58%,光源的调制频率在50%的调制深度下接近40 Hz。A micro-electro-mechanical systems(MEMS) infrared(IR) emitter is presented.The IR emitters are fabricated on silicon-on-insulator(SOI) wafer,and the resistance heating film on the SOI wafer used boron-doped polysilicon by ion implantation technology.The single crystal silicon on SOI wafer is designed as a heavily-doped infrared absorption layer for realizing the self-heating effect.The light-emitting layer is fabricated by using deep reactive ion etching(DRIE)process on the backside of SOI wafer,and the buried SiO2 layer of the SOI wafer is used as etching stop layer to control the thickness of light-emitting layer.The surface temperature and emission spectrum of IR emitter are measured by thermal imaging system and spectroradiometer.The experimental results show that in the case of surface temperature of about 700 K,the energy conversion efficiency is about 5.58% in the spectrum range of 1.3--14.5 μm.The experiments also show that the modulation frequency can reach to 40 Hz at 50% modulation depth.航空科学基金(20080868011;20080868009)资助课

模块化钢结构建筑平面布局方案智能生成式设计方法

为研究模块化钢结构建筑平面布局方案的智能生成式设计方法，分别基于平面可行域的有限离散化、不同的变量定义方法、约束条件和目标函数，形成了多目标非线性约束整数规划问题和线性整数规划问题，并分别提出了基于遗传算法和平面密铺算法的求解方法。通过一例基于L形平面可行域的数值算例，阐释了所提出方法的可行性和有效性。数值算例结果表明，在相同目标函数下的模块化钢结构建筑布局方案最优解不唯一；基于遗传算法的智能生成式方法可在较小的计算代价下得到较优的可行解，并可为模块单元尺寸的选型提供依据；基于平面密铺算法的智能生成式方法适应于不同的模块单元集，并在给定模块类型的基础上给出模块单元总数最低的布局方案。通过对比2种智能生成式方法的寻优结果，建议采用基于遗传算法的智能生成式方法初步确定模块单元的尺寸，并进一步结合2种智能生成式算法求解不同的最优平面布局方案

The study of antimony(V) adsorption by commercial iron oxide red(氧化铁红对印染废水中锑（V）的吸附性能)

印染行业锑（Sb）污染严重，常规除锑工艺难以达标，铁氧化物对水中锑及其化合物具有良好的吸附效果，选取氧化铁红110、138与190，分别记为T110、T138、T190，对模拟印染废水中的Sb（V）进行吸附去除。结果表明，当Sb（V）初始浓度为200 μg·L-1，投加量为0.2 g·L-1时，T138的除锑效果最佳，去除率可达99.44%。XRD图谱显示，氧化铁红的主要成分为α-Fe2O3。TEM与XPS图谱表明，T138的颗粒形状较不规则且相对粗糙，含还原态铁与丰富的羟基位点，有利于吸附Sb（V）。吸附动力学实验显示，Sb（V）吸附过程较符合准二级动力学模型，以化学吸附为主。吸附热力学结果表明，T110与T138对Sb（V）的吸附较符合Freundlich模型，T190则较符合Langmuir模型。在实际应用中，印染废水中共存的含氧阴离子与染料明显抑制氧化铁红对Sb（V）的吸附

ArchSim: A System-Level Parallel Simulation Platform for the Architecture Design of High Performance Computer

Abstract High performance computer (HPC) is a complex huge system, of which the architecture design meets increasing difficulties and risks. Traditional methods, such as theoretical analysis, component-level simulation and sequential simulation, are not applicable to system-level simulations of HPC systems. Even the parallel simulation using large-scale parallel machines also have many difficulties in scalability, reliability, generality, as well as efficiency. According to the current needs of HPC architecture design, this paper proposes a system-level parallel simulation platform: ArchSim. We first introduce the architecture of ArchSim simulation platform which is composed of a global server (GS), local server agents (LSA) and entities. Secondly, we emphasize some key techniques of ArchSim, including the synchronization protocol, the communication mechanism and the distributed checkpointing/restart mechanism. We then make a synthesized test of some main performance indices of ArchSim with the phold benchmark and analyze the extra overhead generated by ArchSim. Finally, based on ArchSim, we construct a parallel event-driven interconnection network simulator and a system-level simulator for a small scale HPC system with 256 processors. The results of the performance test and HPC system simulations demonstrate that ArchSim can achieve high speedup ratio and high scalability on parallel host machine and support system-level simulations for the architecture design of HPC systems

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies