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PVA/PVP共混交联膜的渗透蒸发分离性质(Ⅰ) 总被引:6,自引:1,他引:6
研究了4,4'-双叠氮芪-2,2'-二磺酸钠和戊二醛对聚乙烯吡咯烷酮(PVP)、聚乙烯醇(PVA)共混膜的交联及交联对共混膜分离恒沸点附近的乙醇/水混合物的影响.结果表明,膜的分离性质随着膜中PVP含量的增加而改变;采用混合型交联剂对PVA/PVP共混膜交联能明显改善膜的选择性. 相似文献
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介绍了光磁混合存储动态测试系统中聚焦伺服模块的设计和实现.伺服模块采用了双光束的方案,用独立的红光抽运(LD)作为伺服光源,构成独立的动态聚焦伺服单元,使伺服单元具有模块化、可移植的特点.它不仅适用于混合存储动态测试系统,还可用于卧式或立式、静态或动态的远场激光记录系统中.本文研究了聚焦模块中执行器压电陶瓷(PZT)的幅相频特性和非线性滞回效应,在控制算法方面,使用了PI算法闭环控制结合逆系统和逆非线性滞回模型进行校正,实现了高精度的动态聚焦伺服,在盘片转速为8 r/s时聚焦偏差在±130 nm内.利用该测试系统对有机材料作了动态记录测试,记录点大小和深度均匀一致. 相似文献
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SbOx thin films are deposited by reactive dc-magnetron sputtering from an antimony metal target in Ar+O2 with the relative O2 content 7%. It is found that the as-deposited films can represent a two-component system comprising amorphous Sb and amorphous Sb2 O3. The crystallization of Sb is responsible for the changes of optical properties of the films. The results of the static test show that the SbOx thin films have good writing sensitivity for blue laser beams and the recording marks are very clear and circular. High reflectivity contrast of about 41% is obtained at a writing power 6mW and writing pulse width 300ns. In addition, the films show a good stability after reading 10000 times. 相似文献
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The coupling effect of air-bridges on broadband spiral inductors in SiC-based MMIC technology 下载免费PDF全文
The coupling effect of air-bridges on broadband spiral inductors in SiC-based MMIC technology has been investigated deeply. The fabricated 1-nH spiral inductor on SiC substrate demonstrates a self-resonant frequency of 51.6 GHz, with a peak Q-fact of 12.14 at 22.1 GHz. From the S-parameters measurements, the exponential decay phenomenon is observed for L, Q-factor, and SRF with the air-bridge height decreasing, and an analytic expression is concluded to exactly fit the measured data which can be used to predict the performance of the spiral inductor. All the coefficients in the formula have specific meaning. By means of establishing the lumped model, the parasitic coupling capacitance of the air-bridge has been extracted and presents the exponential decay with the air-bridge heights decreasing which indicates that this capacitor is directly related to the coupling effect of the air-bridge. Through the electromagnetic field distribution simulation, the details of the electric field around the air-bridge have been presented which demonstrate the formation and the variation principles of the coupling effect. 相似文献
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铝的多孔阳极氧化自组织过程结晶度依赖特性 总被引:2,自引:0,他引:2
电子束蒸发在硅衬底上的多晶铝膜多孔型阳极氧化得到的多孔列阵排布与体材料单晶铝氧化结果比较,有序度存在很大差异,导致这种差异的原因,除了氧化时间、应用电压、电解液等电化学参数外,新引入的结晶度将作为一重要因数影响自组织过程.结晶度的影响主要反映在晶粒间界区域相比于晶粒内部存在的铝原子浓度和阳极氧化反应速度涨落,这种涨落将通过干扰孔底电场的分布,对自组织过程产生微扰,由于微扰具有实时和随机性质,将使铝膜阳极氧化不再象体材铝那样,可以通过单一延长时间来最终改善孔排布的有序度. 相似文献
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