脉间波形幅相联合设计抗欺骗干扰方法

欺骗干扰作为一种典型的有源干扰,在距离维或多普勒维上产生虚假目标,使雷达发生虚警,严重影响雷达正常工作.针对速度欺骗干扰,该文提出了一种基于脉间波形幅相联合设计的抗速度欺骗干扰方法.首先,根据速度欺骗干扰下的雷达回波模型,建立最小化阻带内干扰能量与目标旁瓣能量的加权和的优化准则,同时考虑离散量化相位和峰均功率比(PAR...     

含氮有机物对活性碳纤维还原吸附银的影响

用H3PO4、ZnCl2等活化剂分别制备了两种化学活化的活性碳纤维（HPSACF和ZCSACF）,并通过水蒸汽活化制备了水蒸气活化活性碳纤维（SACF）。研究了它们对水溶液中Ag(NH3)2^ 的还原吸附性能,并与活性碳（AC）的还原吸附进行了比较。不同方法制备的活性碳纤维（ACF）对Ag(NH3)2^ 的还原吸附能力有显著的差异,以磷酸活化法制备的ACF的还原能力最强,而AC有一定的还原吸附能力。含氮有机物的吸附对活性碳纤维或活性碳的还原吸附能力有很大的影响,一般而言,吸附至碳吸附剂上的对硝基苯酚和苯胺可促进AC、SACF和HPSACF的还原能力,且苯胺的促进作用大于硝基苯酚的促进作用。     

有机抑制剂在浮选中抑制黄铁矿的研究进展

论述了浮选中有机抑制剂对黄铁矿的研究进展.硫化矿有机抑制剂抑制性能取决于其分子结构.有机抑制剂按分子量可将其分为大分子和小分子两大类,这两类抑制剂各有优势,大分子抑制剂亲固基种类多、含较多亲水基团以及分子量大,对黄铁矿的抑制能力强;小分子有机抑制亲固基团中基本上都要求有硫原子或磷原子,同时也含多个亲水基,抑制能力不如大分子抑制剂,一般都与其它抑制剂组合使用,以增强其对黄铁矿的抑制作用.讨论了不同类型的有机抑制剂抑制黄铁矿的应用及抑制作用机理.     

Steam effects over Pd/Ce0.67Zr0.33O2 three-way catalyst

In the purification process of automobile exhaust,existing water plays an important role as an oxidant,which converts CO and hydrocarbons(HCs) by the water-gas shift(WGS) and the steam reforming(SR) reactions,respectively,especially at high temperatures.Meanwhile it is major component of the exhaust which can affect significantly the thermal stability of the three-way catalyst.Activity experiments were carried out close to the real operation conditions(GHSV,concentration,etc.) with a Pd/Ce0.67Zr0.33O2 catal...     

Structure Model of Granules for Sintering Mixtures

Structure model of granules, boundary value of nucleus and powder, and the relationship between granula- tion efficiency and boundary value were investigated. Granules of sintering mixtures are composed of adhesive powder and nucleus. In the mixtures, particles larger than 1.00 mm act as nucleus and particles smaller than 0.25 mm act as adhesive powder. Particles with size between 0.25--1.00 mm can be adhesive powder as well as nucleus depending on the granulation conditions. When the boundary value is close to 0.25 mm, the granulation efficiency is lower than 50%. When the boundary value is close to 1.00 mm, the granulation efficiency is above 90%. The boundary value is influenced by the iron ore type, granulation moisture, fineness of raw materials and burnt-lime activity. Good adhe- sive capability, suitable moisture content, appropriate particle size distribution and high burnt-lime activity make the boundary value move towards 1.00 mm and improve the granulation efficiency.     

浅谈济钢新建石灰窑窑型的确定

通过对世界上先进的石灰窑窑型的各项指标比较 ,结合济钢的实际情况 ,确定选择意大利弗卡斯公司的套筒窑为新建石灰窑的窑型     

纤维素酶的活性测定及其影响因素

本文讨论了酸性纤维素酶的活性测定方法,研究了影响酶活性的各种因素,并耐酸性纤维素酶活性的终止方法进行了探讨．     

电力系统谐波抑制及谐波电能利用

对于电网中的谐波抑制方法是无源滤波器和有源滤波器。无源滤波器根据交流电路串、并联谐振的原理,使高频成分流到地线而消除对电源的污染。有源滤波器采用补偿谐波电流的方式消除非线性负载对电源的污染。上述方式是以牺牲谐波电能为代价达到谐波抑制的目的。文章以无源滤波器滤波为例,提出使用多抽头变压器提取谐波电能的方法。经过实际测试,证明所提出的方法简便,可行性高,节能效果明显。     

Effects of Nitrogen Doping on Microstructure and Photocatalytic Activity of Nanocrystalline TiO2 Powders

Nitrogen-doped TiO2 nanocrystalline powders were prepared by hydrolysis of tetrachloride titanium （TiCl4） in a mixed solution of ethanol and ammonium nitrate （NH4NO3） at ambient temperature and atmosphere followed by calcination at 400 ℃ for 2 h in air. FTIR spectra demonstrate that amine group in original gel is eliminated by calcination, and the TiO2 powder is liable to absorb water onto its surface and into its capillary pore. XRD and SEM results show that the average size of nanocrystalline TiO2 particles is no more than 60 nm and with increasing the calcination temperature, the size of particles increases. XPS studies indicate the nitrogen atom enters into the TiO2 lattice and occupies the position of oxygen atom. The nitrogen doping not only depresses the grain growth of TiO2 particles, but also reduces the phase transformation temperature of anatase to futile. The photocatalytic activity of the nitrogen-doped TiO2 powders has been evaluated by experiments of photocatalytic degradation aqueous methylene blue.     

家蚕表达重组人乳铁蛋白及产物对溃疡性结肠炎的治疗作用

乳铁蛋白(LF)在抗炎和参与机体免疫调节方面具有重要作用。利用家蚕杆状病毒表达系统构建含人乳铁蛋白(hLF)基因的重组病毒Bm-hLF,接种蚕蛹表达重组人乳铁蛋白(rhLF),ELISA法检测rhLF的表达量,体外抑菌试验检测其抑菌活性,并建立小鼠溃疡性结肠炎(UC)模型,探究口服rhLF蚕蛹粉对UC的治疗效果。结果表明:rhLF在蚕蛹感染重组病毒120h后表达量最高达0.38mg/mL蚕蛹匀浆上清液;rhLF蚕蛹粉能抑制E.coli TG1的生长;口服rhLF蚕蛹粉可明显降低UC小鼠的疾病活动指数(DAI)、髓过氧化物酶(MPO)含量,减轻结肠组织炎症损伤,为今后开发一种新型、廉价的UC口服药物提供药效学实验参考。