日光/H202/草酸铁催化氧化降解活性艳红的研究

研究了日光/H202/草酸铁体系以日光为驱动力对可溶性染料活性艳红进行降解反应,探讨了溶液的pH、H2O2、光强和活性艳红的起始浓度对催化反应的影响。结果表明,对活性艳红的降解速率受pH、H2O2、草酸铁的浓度、入射光强的影响很大。在研究范围内,pH=3.0和在日光照射下其降解效果最好,同时,表明在同一光强光源条件下色度、TOC的去除率均比在UV/TiO2的效果好。     

A type of 2D magnetic equivalent circuit framework of permanent magnet for magnetic system in AEMR

Modeling of permanent magnet(PM) is very important in the process of electromagnetic system calculation of aerospace electromagnetic relay(AEMR). In traditional analytical calculation, PM is often equivalent to a lumped parameter model of one magnetic resistance and one magnetic potential, but great error is often caused for the inner differences of PM; based on the conception of flux tube, a type of 2D magnetic equivalent circuit framework of permanent magnet model(2D MECF) is established; the element is defined, the relationship between elements is deduced, and solution procedure as well as verification condition of this model is given; by a case study of the electromagnetic system of a certain type of AEMR, the electromagnetic system calculation model is established based on 2D MECF and the attractive force at different rotation angles is calculated; the proposed method is compared with the traditional lumped parameter model and finite element method(FEM); for some types of electromagnetic systems with symmetrical structure, 2D MECF proves to be of acceptable accuracy and high calculation speed which fit the requirement of robust design for AEMR.     

Effects of cerium salts on corrosion behaviors of Si–Zr hybrid sol–gel coatings

The present work examines the effects of cerium salts on corrosion behaviors of Si–Zr hybrid sol–gel coatings. The Si–Zr hybrid sol–gel coatings on a 2A12 aluminum substrate were prepared through hydrolysis and condensation of glycidoxypropyl-trimethoxy-silane(GTMS) and zirconium(IV) n-propoxide(TPOZ). Used as inhibitors for corrosion, three types of cerium salts(Ce(NO_3)_3, CeCl_3, and Ce(CH_3COO)_3) were doped into the sol–gel coatings. Fourier transform infrared(FTIR) and scanning electron microscopy(SEM) were employed to investigate the structures and morphologies of various coatings, and the corrosion resistances of the coatings were evaluated by electrochemical methods and neutral salt spray tests. Experimental results indicate that the addition of cerium salts can hinder the process of corrosion due to their self-healing abilities. Furthermore, the sol–gel coating doped with Ce(CH_3COO)_3 has the best corrosion resistance because of the promotions of hydrolysis and condensation provided by CH_3COO.     

空域CFAR处理方法综述

综述了空域恒虚警（Constanl False Alarm Rate,CFAR）处理研究的发展、现状和最新进展。首先,讨论了空域CFAR处理的概念及其在整个CFAR处理中所处的位置;然后,将空域CFAR处理算法分为ML类、OS类和自适应算法,介绍了每类CFAR算法的研究现状;最后,展望了空域CFAR处理算法的发展,指出...     

Sensitivity analyses of satellite propulsion components with their thermal modelling

Performing the sensitivity analyses of the contact conduction and the position of thermostat on the basis of the thermal model established, the study of thermal design is accomplished for the preparation of possible mechanical interface change of the satellite propulsion system depending on the satellite system design. A relatively simple thermal model is taken into consideration for the convenience of the analysis. A variety of the spacecraft bus voltages and the contact resistances are examined as well as the position of thermostat on propulsion components. As a consequence, even though the mechanical interface condition is changed on the same module, the successful thermal design could be achieved if we design the heater to have sufficiently large power with reference to the heritage value of contact resistance. Besides the reasonable performance on the thermal control is assured with the thermostat location errors, if the uncertainty in the position of thermostat is not quite large when assembling tank module.     

航空机载电子设备防护设计

简述了机载电子设备防护的重要性,提出了进行防护设计的若干原则和具体意见。     

Theorem for the combination of bistatic radar measurements using least squares

In order to improve position finding performance, least squares method is often used to combine the measurement sets of bistatic radar system. However, which measurement sets can be combined by least squares method and which cannot have received little attention until now. We address this issue based on 2 measurements of bistatic radar system, for example (/spl rho/, /spl theta//sub T/), and present a new theorem, with proof, which shows that the least squares estimator can be obtained by combining any two measurement sets if these measurement pairs are disjoint. We provide an example that satisfies this condition, which shows that the least square combination of measurement sets yield improved performance especially in the vicinity of the transmitter and the receiver.     

基于虚拟合成仪器的武器系统电参数测量技术研究

针对部队装备维护使用的某型引俄防空装备配套测试设备存在的诸多问题,在交流分析的基础上,确定某型装备8种随装测量仪器仪表的技战指标,利用广泛使用的仪器仪表和现有的成熟技术,研制硬件系统和编制软件,最大限度进行仪器合成,研制出小型化、多功能、一体化的便携式测试设备.使用结果表明,能有效保证装备的正常维护,提高部队和工厂的装...     

发展面向21世纪的纳米技术

通过对纳米技术最新发展的介绍，结合计量测试技术，提出了发展我国纳米技术战略的建议。     

ZN-17黏弹材料动态阻尼特性实验研究及其数据拟合分析

基于对温度、频率和动态位移的扫描实验,研究了ZN-17黏弹材料损耗因子和复模量随温度、频率和动态位移变化的规律,并根据实验结果拟合了材料损耗因子和储能模量的数学表达式,误差分析表明此表达式能较准确地反映在不同温度、不同频率和不同动态位移下的动态阻尼特性.