Research on Improvement and Applications for Bayesian Fault Diagnosis

控制回路故障检测与诊断有助于保证生产过程的安全和高效、降低维护费用和减少停机时间。贝叶斯诊断是控制回路监测的概率化诊断框架，它能够综合多个监测器技术，以构建诊断系统进而作出最优决策。然而，工业过程控制回路诊断中存在许多不同的实际情况，严重制约了贝叶斯诊断的性能。本文重点从数据降维、似然估计等方面研究改进贝叶斯诊断性能的方法，提出了基于优化直方图估计的证据离散化方法、基于线性判别分析的特征提取与降维以及平均移动似然估计方法。通过仿真系统、工业基准数据和工业规模系统的仿真实验，验证了所提方法的有效性。论文主要包含以下几个方面的工作： (1) 综述了现有的贝叶斯诊断方法及其研究现状，系统介绍了控制...The purpose of control loop detection and diagnosis is to ensure the safety and efficacy of the production process, reduce maintenance costs and downtime. Bayesian diagnosis is a probabilistic diagnosis framework of control loop monitoring, which can combine multiple monitor technology to build a diagnosis system and make an optimal decision. However, there are many different situations in the con...学位：工程硕士院系专业：航空航天学院_工程硕士(控制工程)学号：2322013115337

Dynamic Phase Correction by Wavelet Analysis in Magnetic Resonance Spectroscopy

【中文文摘】核磁共振实验中某些非平稳效应 (如附加磁场的干扰 )会引起的谱峰相位畸变 ,这类相位畸变不能由常规的一阶或二阶线性相位校正来补偿。本文引入了一种“动态相位校正”方法 ,该方法利用连续小波变换直接从已知参考峰的连续时间—尺度表示中提取瞬时相位等有用信息 ,然后对全谱进行动态相位校正。理论表述和仿真分析表明 :该方法为获得高分辨 NMR谱提供一种新的有效的相位校正方式 【英文文摘】In NMR experiments,the peaks always have some phase distortions perturbed by some non stationary effects,such as additional magnetic fields.These phase distortions can not be removed by the routine first order or second order linear phase correction.In this paper,we introduce a new method called by dynamic phase correction.The distorted information is directly extracted from the known referenced peak at the time scale plane of continue wavelet transform;then apply"dynamic phase correction" to the full spectrum. Theoretic representations and simulation results show that the method provides a new efficient way to reconstruct such phase-distorted国家自然科学基金重点项目 ( 10 2 3 40 70 );; 福建省自然科学基金 ( A0 2 10 0 0 3 )资助项

Relation Between Changes in Ultrastructure and Composition of Cell Wall and Calcium related Physiological Disorder of Chinese Cabbage ( Brassica campestris ssp. pekinensis )

缺钙培养诱导大白菜干烧心发生 ,测定心叶组织细胞壁各成分含量的变化。结果表明 ,随着缺钙天数增加 ,果胶、半纤维素 1(HC1)和纤维素的含量呈平稳上升 ,到缺钙处理后第 2 4天时达到高峰 ,随后急剧下降 ,而半纤维素 2 (HC2 )的含量变化不大 ;醛酸在果胶中的含量逐渐呈下降趋势 ,在HC2中的含量先升后降 ,而在HC1和纤维素中的含量变化不大 ;总糖在HC1和纤维素中的含量呈下降趋势 ,在果胶中的含量先升后降 ,而在HC2中的含量变化不大 ;葡聚糖含量也是先升后降 ,在缺钙处理后第 8天有一高峰值 ;尤其是蛋白质在果胶和纤维素部分中的含量较低且变化不大 ,在HC1中的含量极明显减少 ,而在HC2中的含量却极显著增加。同时 ,细胞壁结构发生相应变化。可见 ,大白菜干烧心的发生与细胞壁结构和功能的变化直接相关It is proposed that the so called “tipburn” sympton in Chinese cabbage is caused by Ca deficiency in inner leaf tissues. The changes in the cell wall structure and its composition were followed during the development of “tipburn” sympton using a hydroponic culture system for Chinese cabbage, in which Ca deficiency treatment was included. During the course of development of Ca deficiency induced, the contents of pectin, hemicellulose portion I(HC1) and cellulose increased steadily until their peaks were reached on the 24th day after treatment, then declined rapidly (Fig.1). In contrast, that of hemicellulose portion II (HC2) was stable during the course (Fig.1). The content of uronic acids decreased in the portions of pectin, rose and then dropped in the portions of HC2, kept constant in the HC1 and cellulose portions (Fig.2). The content of total sugar was decreased in the HC1 and cellulose portions, rose and then declined in the portions of pectin, but seemed to be constant in the portions of HC2 (Fig.3). The content of proteins was low and little changes in the pectin and cellulose portions during the course of Ca deficiency. However, proteins in the portions of HC1 decreased significantly in constrast to the rapid increase in the portions of HC2 (Fig.4). In addition, Ca deficiency resulted in a shift of callose synthesis during the earily days of treatment until day 8 when callose began to decrease. The role of Ca in maintaining cell wall structure and function and its relation to the development of “tipburn” sympton was disscused in connection with these results.国家自然科学基金资助项

Density Functional Theory Study on Ergosterol Peroxide

采用密度泛函理论(DFT)方法,在B3LYP/6-311+G(2d,p)水平上对过氧化麦角甾醇进行了计算研究。优化得到了过氧化麦角甾醇分子的结构,给出了分子的键长、键角、二面角等参数,并对其进行了1HNMR光谱、IR光谱、UV-Vis光谱理论模拟和自然电荷分析。自然电荷计算表明,羟基O和H原子很可能是关键的活性中心。理论计算结果与实验值符合的很好

分子标记技术及其在动植物检验检疫中的应用与展望

介绍几种常用的分子水平的遗传标记技术 ,综述了分子标记技术在动植物、食品等检验检疫及转基因成分检测中的应用 ,展望了分子标记技术在检验检疫中应用的信息化、网络化前景 ,并提出了建立“数字质检”体系的必要性。福建省科技重大项目 (2 0 0 1H0 11

Application of molecular marker techniques in the inspection and quarantine of animal & plant as well as in the detection of GMOs

介绍了几种常用的分子标记技术,综述了分子标记技术在动植物、食品等检验检疫与转基因生物及其产品外源基因检测中的应用,展望了分子标记技术在检验检疫中应用的信息化、网络化前景.This review paper introduced some molecular marker techniques and summarized the application of the techniques in the inspection and quarantine of animal, plant and food, as well as in the detection of genetically modified organisms(GMO). It also envisioned the prospects tor building up an applied information and network system in the inspection and quarantine.福建省科技厅重大项目资助(2001H011);; 国家人事部留学回国人员科技活动项目择优资助;; 福建检验检疫局科研资助项目(FK2001 21)

Construction of database of genetically modified organism and its products

使用SQL数据库管理系统作为平台 ,将转基因产品外源基因检测技术的研究成果与利用英特网等手段收集的国内外有关转基因生物及其产品的研究技术与产业化状况、安全管理法律法规、检测方法与标准及科普知识等信息与数据 ,构建成数据库 ,含承担单位情况简介、留言本与8个子库 ,共54个栏目 ,约12500条记录 ,总容量达100兆字节 (MB)以上。本文主要介绍该数据库的系统开发、构建过程、内容、功能等The database of genetically modified organism(GMO)and its products was constructed based on the SQL software system.It included the research results of the detection techniques of GMO and its products developed by authors,relevant information of transgenic technology and knowledge,law of security management and detection techˉniques of GMO published and so on,collected from internet websites.The database consisted of brief introduction of maker laboratory,feedback and other8sub-databases that includes54sections,more than12500records with the content more than100MB.The system development,construction process and function of the database were also introˉduced briefly.福建省科技重大项目 (2001H011);; 国家人事部留学回国人员择优资助项目;; 福建检验检疫局科研项目 (FK2001 -21)资

基于半导体激光器的脉冲整形技术

论述一种新的激光脉冲整形方法-利用任意形状的整形电脉冲直接驱动半导体激光器,产生与电脉冲形状一致的激光脉冲,作为高功率激光装置的种子光源。使用GaAs场效应管作为开关器件,使用超宽带脉冲触发场效应管产生整形电脉冲,引入阻抗渐变微带技术克服了触发脉冲损耗对级联场效应管数量限制,将整形电脉冲脉冲宽度扩展到10 ns。以整形电脉冲直接驱动半导体激光器,可产生脉宽为10 ns,时域调节精度为330 ps的任意整形激光脉冲