On the relationship between parity space and approaches to fault detection

Parity space approach and H₂ approach are two important fault detection approaches. This paper studies the relationship between these two approaches, which reveals frequency domain characteristics of the optimal solution of the parity space approach on the one side and provides a numerical solution of the H₂-optimal design of residual generators on the other side.     

Phase regression approach for estimating the parameters of a noisy multifrequency signal

A novel approach for estimating the parameters of a multifrequency signal from discrete samples corrupted by additive noise is presented. An established mathematical model indicates that noise influence on the discrete phase and amplitude spectra is equivalent to additive phase and amplitude noise, respectively. On this basis, a simple algorithm is proposed to estimate the frequency and phase of each sinusoid component by linear regression on the phase spectra of segmented signal blocks, while an amplitude estimator is directly derived from the spectrum of the window function. The circular nature of the phase spectrum is thoroughly explored. Also, an algorithmic scheme is presented. The derived variances of the estimators show that for a noisy signal this approach provides superior accuracy over the traditional approaches. Simulations and engineering application confirm the validity of the presented method.     

J-199热熔胶膜的研制

讨论了不同VA含量不同熔体指数的EVA和各种增粘剂对热熔胶膜耐热性、软化点、剪切强度、拉伸强度、剥离强度等性能的影响。通过采用不同材料试验和配方的筛选，研制出一种90℃剪切强度0．07MPa、拉伸强度0．47MPa、耐热性好、粘接强度高的热熔胶膜，从而拓宽了热熔胶的使用范围。     

CO2激光器线偏振光输出腔内起偏器的研究

混合InGaAs光电二极管阵列ETX128FPA是16384元InGaAs焦平面阵列,供1.0～1.7μm波段内的近红外成象使用。这种128×128元的二维光电二极管阵列是使用钢冲击结合技术把InGaAs材料结合到高级的CMOS倍增管上而制成的。     

α—当归内酯的合成及在烟草香精中的应用

α-当归内酯是一种香味成分,它具有甜香、枫械香等多种香韵,在烟草香精中有广泛的用途。本文对α-当归内酯的合成方法进行了研究,提出了一条合理可行的的工艺路线;同时通过对α-当归内酯在烟用香精中的应用试验,证明了它是一种理想的烟草香味添加剂。     

^60Coγ射线对刚地弓形虫缓殖子感染性的影响

应用不同剂量的~(60)Coγ射线照射含NT株弓形虫包囊的鼠脑匀浆后,以0.4％胰蛋白酶液消化,使弓形虫缓殖子从包囊中释放出来,并用生理盐水作连续10倍稀释,使成为含不同数量缓殖子的悬液,将此悬液接种小鼠,用生物检测方法确定其感染性。另设未经照射处理的缓殖子悬液感染小鼠的对照组。结果表明,γ射线0.55kGy剂量为控制鼠脑中NT株弓形虫感染性的最小有效剂量。γ射线0.1kGy剂量对弓形虫缓殖子感染性无明显影响,而0.45kGy照射后,其感染性较前者下降了10~4倍。     

我国石油开采与油井管生产概述

概略介绍了我国石油开采及其专用管材的需求情况以及油井管的生产规划和要求,对发展国内油井管特别是焊接油井管生产提出了建议。     

步进式加热炉炉温优化设定模型及软件开发

针对线材厂步进式加热炉实际工况，提出了基于经验规则的炉温优化设定模型和在线自学习获取知识的思想，并以炉温优化设定模型为核心，开发出加热炉计算机控制系统的优化运行软件。     

基于曲率的透视不变性分割

曲线的透视不变性分割在基于二次曲线的三维重建中非常重要。首先给出了连续曲线零曲率点和角点的提取法，在数字图像中曲经是不连续的，曲率的变化受噪声的干扰很大。在这种情况下为了检测出零曲率点和角点，对曲线采用了高斯滤波然后再提到零曲率点和角点。实验证明这种方法效果优于直接求曲率法。