微静电陀螺仪再平衡回路设计

微静电陀螺仪依靠可控的静电力,将高速旋转的陀螺转子稳定地悬浮在高真空的电极腔中心,是一种能实现两自由度角速率测量的新型微机电陀螺。针对大角度、高角速率的捷联式惯性导航系统应用,对陀螺仪再平衡回路进行了设计。讨论了陀螺仪的动力学特性,给出了补偿负刚度特性的方法,采用双频波特图对系统稳定性进行了分析,给出了再平衡回路的性能仿真结果。仿真与分析表明,陀螺仪允许的最大输入角速度为768(°)/s,标度系数为6.44mV/((°)·s-1)。     

Comparison of two kinds of active layers for high-power narrow-stripe distributed feedback laser diodes

Usually GaAs/AlGaAs is utilized as an active layer material in laser diodes operating in the spectral range of 800--850 nm. In this work, in addition to a traditional unstrained GaAs/AlGaAs distributed feedback (DFB) laser diode, a compressively strained InGaAlAs/AlGaAs DFB laser diode is numerically investigated in characteristic. The simulation results show that the compressively strained DFB laser diode has a lower transparency carrier density, higher gain, lower Auger recombination rate, and higher stimulated recombination rate, which lead to better a device performance, than the traditional unstrained GaAs/AlGaAs DFB laser diode.     

电阻蒸发铝薄膜结构及其对非晶硅太阳电池性能的影响

本文首先采用电阻蒸发法制备了不同厚度的Al薄膜,并选择了两个典型厚度的Al薄膜制备工艺来制备非晶硅太阳电池的Al背电极,研究了Al背电极厚度对电池性能的影响.结果表明,Al背电极的厚度由800nm减薄到70nm时,电池的Voc平均值由0.826V增加到0.829V,电池的Jsc平均值由11.747mA/cm2减小到11.318 mA/cm2,电池的FF平均值由0.701增加到0.728,而电池效率的平均值略有增加,由6.803;增加到6.833;.用扫描电镜(SEM)和X射线衍射(XRD)研究了玻璃衬底上蒸发的Al薄膜和非晶硅电池Al背电极表面形貌和微观结构的变化,分析了电池性能随Al背电极厚度变化的原因.     

Nickel-disilicide-assisted excimer laser crystallization of amorphous silicon

Polycrystalline silicon (poly-Si) thin film has been prepared by means of nickel-disilicide (NiSi多晶硅 受激准分子激光器结晶 结晶化 界面晶粒生长polycrystalline silicon, excimer laser crystallization,Ni-disilicide, Ni-metal-induced lateral crystallization, two-interface grain growthProject supported by the National High Technology Development Program of China (Grant No 2002AA303250) and by the National Natural Science Foundation of China (Grant No 60576056).9/7/2005 12:00:00 AM3/6/2006 12:00:00 AMPolycrystalline silicon （poly-Si） thin film has been prepared by means of nickel-disilicide （NiSi2） assisted excimer laser crystallization （ELC）. The process to prepare a sample includes two steps. One step consists of the formation of NiSi2 precipitates by heat-treating the dehydrogenated amorphous silicon （a-Si） coated with a thin layer of Ni. And the other step consists of the formation of poly-Si grains by means of ELC. According to the test results of scanning electron microscopy （SEM）, another grain growth model named two-interface grain growth has been proposed to contrast with the conventional Ni-metal-induced lateral crystallization （Ni-MILC） model and the ELC model. That is, an additional grain growth interface other than that in conventional ELC is formed, which consists of NiSi2 precipitates and a-Si. The processes for grain growth according to various excimer laser energy densities delivered to the a-Si film have been discussed. It is discovered that grains with needle shape and most of a uniform orientation are formed which grow up with NiSi2 precipitates as seeds. The reason for the formation of such grains which are different from that of Ni-MILC without migration of Ni atoms is not clear. Our model and analysis point out a method to prepare grains with needle shape and mostly of a uniform orientation. If such grains are utilized to make thin-film transistor, its characteristics may be improved.     

真菌漆酶及其催化对苯基苯酚聚合条件的研究

白腐菌Panus conchatus在液体培养条件下产生了漆酶,经纯化分离后用于对苯基苯酚的催化聚合,探讨了反应温度、缓冲溶液pH以及反应体系中溶剂二氧六环的含量对漆酶催化对苯基苯酚聚合的影响。结果表明,漆酶催化对苯基苯酚聚合反应的最佳反应条件为：温度为40℃,混合溶剂中二氧六环的体积百分数为85％。缓冲溶液为pH=4的0．2mol／L HAc-NaAc溶液。在此条件下用漆酶催化对苯基苯酚聚合,得到了重均分子量Mw=80533的聚酚产物。得率为75.5％。     

衰减全反射-紫外/可见光谱传感技术

阐述了衰减全反射法(ATR)的光学原理、衰减全反射一紫外／可见光谱方法(ATR-UV)的特征及其应用中的校正方法。ATR-UV传感器能够同时检测化工过程中体系的多种主要组成的含量,其方法简单、迅速、准确,无需对试样进行预处理或稀释,该技术对于在线或内置传感监测化学化工过程方面具有很好的应用前景。     

微乳液介质中5‘—硝基水杨基荧光酮光度法测定微量铅

研究了在阳离子型微乳液：CTMAB／n－C5H11OH-n－C7H16／H2O介质中,Pb（Ⅱ）－5’-硝基水杨基荧光酮（5’－NSF）的显色反应。在oH9．0NH3·H2O-NH4Cl缓冲体系中,Pb（Ⅱ）与5’－NSF形成1：2紫色络合物,ε575=1．14×105L·mol－1·cm－1,Pb（Ⅱ）浓度在0－0．52mg／L范围内服从比尔定律。方法用于样品中微量铅的测定,结果令人满意。     

微乳液介质中5′-硝基水杨基荧光酮光度法测定微量铅

研究了在阳离子型微乳液:CTMAB/n-C5H11OH-n-C7H16/H2O介质中,Pb(Ⅱ)-5′-硝基水杨基荧光酮(5′-NSF)的显色反应.在pH9.0NH3.H2O-NH4Cl缓冲体系中,Pb(Ⅱ)与5′-NSF形成1∶2紫色络合物,ε575=1.14×105L.mol-1.cm-1,Pb(Ⅱ)浓度在0～0.52mg/L范围内服从比尔定律.方法用于样品中微量铅的测定,结果令人满意.     

溴代作用对竹红菌乙素分子性质影响的量子化学研究

用半经验量子化学方法AM1和PM3对竹红菌乙素及其溴代物进行了对比计算,考察了溴代作用对竹红菌乙素分子性质的影响。两种方法所得结果均表明,溴代作用使分子的生成热、前线轨道能级及偶极矩等参数都有所降低,溴代作用也影响了竹红菌乙素分子内氢键的性质,并能使其对光的吸收产生红移。     

氧化物薄膜抗1064nm脉冲激光损伤的特性研究

对向种氧化物介质膜料的单层膜、增透膜及高反膜的激光损伤特性进行了实验研究,分别测试了单脉冲和多脉冲１０６４ｎｍ激光的损伤阈值,分析和讨论了实验的物理现象及其结果。研究表明ＳｉＯ２、Ｇｄ２Ｏ３、Ｅｒ２Ｏ３、Ｙ２Ｏ３具有激光损伤阈值高、损伤程度轻的特点,特别对１０Ｈｚ激光而言,更是明显;增透膜及高反膜加λ／２层ＳｉＯ２对其激光损伤程度和损伤几率。