一种改进的双路Fabry􀀁Perot 干涉式加速度计

采用双路F-P进行加速度测量，有很高的分辨率。原有研究基础上，经过进一步研究发现，其测量结果的灵敏度和传感头中两个F-P干涉腔的腔长有关。从理论方面说明了，其灵敏度和两个F-P腔的腔长的关系，并且在原来传感头的基础上增加了微电压可调PZT，用于调节某一个F-P谐振腔腔长，到达一合适值，以便其灵敏度最大。     

基于混沌电路参数敏感性的信号检测方法研

提出了基于混沌电路参数敏感性的信号检测方法,并分析了用倒锯齿映射来实现这种参数式检测应用的优点,即实现倒锯齿映射的电路结构比较简单,电路输出的符号序列与映射参数在零初值时能够排序.在以该方法为基础的温度测量实验研究中,加入热敏电阻作为主要的感温元件,使测温精度大大提高,说明该方法具有一定的发展潜力,值得进一步研究.     

一种运动估计的小菱形􀀁分层快速搜索算

为了进一步提高运动估计的效率,本文提出了一种新的快速搜索算法.利用实际视频图像运动比较平缓的特点,把图像块分为静止块、准静止块和运动块.对静止块采用一步停止法,对准静止块采用小菱形搜索,对运动块利用运动矢量场在空间和时间上的相关性以及多层结构中父子块间的相关性采用多分辨塔的方式进行分层搜索,显著地提高了搜索速度.     

Global and Local Thresholding Methods Applied to X-ray Microtomographic Analysis of Metallic Foams

X-ray based computed microtomography is a non-destructive, well established tool for a three-dimensional characterization of open-cell metallic foams. Macroscopic physical and chemical properties of these materials stay in close relation to their micro-structure parameters. The purpose of the paper is to present two types of thresholding methods so-called global and local thresholding for evaluating the structural parameters of open-cell metal foams based on X-ray microtomography data. Two different methods were chosen: automatic Otsu thresholding (global) and adaptive (mean of minimal and maximal grey values of grayscales within a selected radius). The key parameters of aluminum and nickel-chromium foams fine structure calculated using Otsu and locally thresholded images were significantly different. The proper image segmentation is the key point in metallic foam morphometry. The influence of a radius of the image processing region on the results obtained is discussed for the local thresholding method. Examples of the images artifacts generated by local thresholding method to demonstrate possible results misinterpretation are also given. The optimization of local thresholding parameter (radius of the image processing region) was presented.     

On the estimation of the size of a subgroup in industrial production: The test gate method

Even in high quality manufacturing, some units may exhibit deviations. Although such units are not actually nonconforming to usage requirements when sent to the field, the deviations may lead to a reduced lifetime. It is therefore imperative to estimate the number of units bearing such deviations for risk assessment. Standard sampling methods are inefficient for this purpose. As an efficient alternative, we suggest the test gate method. The method is demonstrated on two practical examples and we provide an empirical model with stochastic extensions. We discuss the test gate method and customary alternatives, in particular control sampling.     

Effects of wear load on mechanical and morphological properties of A356 matrix carbon nano tube composites

In this study, CNT-A356 composites were prepared by reinforcing an aluminum alloy A356 matrix material with carbon nanotubes (CNT) in 4 different ratio (0.5, 1, 1.5 and 2) and the hardness, abrasion and microstructure properties of these composites were investigated. The powder metallurgy method was used in the production of composite samples. A356 powder and CNTs’ were mixed by ball milling for 1?hour and cold pressed in the powder compression mold. The mold was then taken into a functional oven and hot pressing was performed. The compacted powder bodies were sintered at 550° C for 1?hour in a 10^?6 millibars vacuum environment. Hardness measurements, wear tests and microstructure analyzes of the produced samples were carried out. As a result of experimental studies; it has been observed that the CNTs’ are placed in bulk and between the matrix grains and a more hollow structure is formed by increasing the CNT ratio. Moreover, while the CNT ratio exceeded 1%, the hardness values decreased and weight loss increased. The highest hardness value was obtained in the composites containing 1% CNT.     

N—乙基—3—氰基吡啶酮衍生物的合成

以氰乙酸乙酯、乙酰乙酸乙酯和乙胺为原料经缩合闭环制备Ｎ－乙基－３－氰基－４－甲基－６－羟基吡啶－２－酮，３－氰基吡啶酮低温酸性水解获得Ｎ－乙基－３－氨甲酰基－４－甲基－６－羟基吡啶－２－酮，高温酸性水解制成Ｎ－乙基－４－甲基－６－羟基吡啶－２－酮，并对合成反应的影响因素进行了讨论。结果表明，常压下延长缩合闭环反应时间，Ｎ－乙基－３－氰基－４－甲基－６－羟基吡啶－２－酮收率高达９１．５％，较文献报道     

减小样品温度对近红外定量分析数学模型影响的建模方法

本文以大豆样品为例 ,研究不同的样品温度对于脂肪含量近红外定量分析数学模型的影响 ,并且通过在回归建模过程中包含温度影响因子的混合建模方法来减小温度对于模型的影响 ,使得模型对于温度的适应性增强。实验结果表明 ,混合模型对于不同温度的样品预测能力远远好于单个温度独立模型的预测能力     

无机抗菌聚丙烯的制备及其性能影响因素

采用抗冲聚丙烯和Zn系无机抗菌剂KJZ-Zn,经熔融共混制备出抗菌聚丙烯,研究了所得抗菌聚丙烯的热力学性能、力学性能、抗菌性能及其抗菌持久性的影响因素。结果表明:添加KJZ-Zn无机抗菌剂,对聚丙烯制品的热力学性能及力学性能变化均无明显的影响;当KJZ-Zn抗菌剂添加质量分数为0.3%时,经母料添加法所制备的抗菌聚丙烯,不仅加工经济性能较好,而且对金黄色葡萄球菌、大肠埃希氏菌的抗细菌率均大于98.0%,抗菌性能不低于Ⅱ级;为保证其抗菌性能的持久性,在使用时,既不要长时间浸泡于水中,又要尽量减少清洗次数。