Field Emission from Silicon Nanocrystallite Films with Compact Alignment and Uniform Orientation

Patterned silicon nanocrystallite (SINC) films were fabricated on (100) orientation p-type boron-doped sificon wafer by the hydrogen ion implantation technique and the anodic etching method. The efficient field emission with low turn-on field of about 3.5V/μm at current density of 0.1μA/cm^2 was obtained. The emission current density from the SiNC films reached 1mA/cm^2 under a bias field of about 9.1V/μm. The experimental results demonstrate that there are great potential applications of the SiNC films for fiat panel displays. A surface treatment with hydrogen plasma was performed on the SiNC films and a significant improvement of emission properties was achieved.     

基于光时域反射技术与缠绕式光纤传感陈列的结构状态监测方法

提出了一种新颖的、利用多模光纤缠绕钢绳式的传感阵列网络,对智能材料与结构的受力、应变等状态参量进行了监测和估计,并采用了光时域反射技术实时处理并行分布式传感信号,给出了测试数据、识别结果.     

基于光时域反射技术与缠绕式光纤传感阵列的结构状态监测方法

提出了一种新颖的、利用多模光纤缠绕钢绳式的传感阵列网络, 对智能材料与结构的受力、应变等状态参量进行了监测和估计, 并采用了光时域反射技术实时处理并行分布式传感信号, 给出了测试数据、识别结果     

Variations for Pure Cu Melt Viscosity with Different Atmospheres

The viscosity of Cu melt is obtained to be in the ranges from 2.418 to 3.039 mPa.s under vacuum atmosphere (2Pa),from 2.907 to 3.425mPa.s under nitrogen gas atmosphere and from 3.352 to 4.015mPa.s under argon gas atmosphere.The activation energy is estimated to be 0.224,0.162 and 0.150eV for the vacuum atmosphere (2Pa),nitrogen gas atmosphere and argon gas atmosphere,respectively.The results reflect the essential structureal change in the Cu melt by using different atmospheres.     

光纤传感阵列用于智能复合材料状态监测的研究

以光纤智能材料与结构中的损伤估计为目的,提出了一种新颖的、利用多模光纤缠绕尼龙筋式的传感器,由这种传感器组成的传感阵列可以对智能材料与结构的受力、应变等参量进行检测,并采用ＯＴＤＲ 技术实时处理其输出的并行分布式传感信号,给出了测试数据、识别结果。在复合材料构件上的初步实验表明此系统能够对结构的状态进行在线监测和估计,在航空航天、船舶工业和土木建筑等领域有着潜在的实用价值。     

用相位掩模法制作光纤光栅的技术

准分子激光照射相位掩模后,在近场形成周期的条纹分布,利用近场光强对光敏光纤进行曝光,可以在纤芯中写人光栅。对光纤光栅折射率分布进行合理假设,运用耦合模理论计算了光纤光栅的反射率,对其反射率与相关参数的关系进行了讨论,并且分析了用相位掩模技术制造光纤光栅的影响因素,得出要获得窄带宽高反射率光栅需有适当的折射率调制和大的光纤光栅长度的结论。另外还导出了掩模板后表面的近场光强分布和光纤光栅的周期公式。