Selective growth of carbon nanotube on silicon substrates

The carbon nanotube （CNT） growth of iron oxide-deposited trench-patterns and the locally-ordered CNT arrays on silicon substrate were achieved by simple thermal chemical vapor deposition（STCVD） of ethanol vapor. The CNTs were uniformly synthesized with good selectivity on trench-patterned silicon substrates. This fabrication process is compatible with currently used semiconductor-processing technologies, and the carbon-nanotube fabrication process can be widely applied for the development of electronic devices using carbon-nanotube field emitters as cold cathodes and can revolutionize the area of field-emitting electronic devices. The site-selective growth of CNT from an iron oxide nanoparticle catalyst patterned were also achieved by drying-mediated self-assembly technique. The present method offers a simple and cost-effective method to grow carbon nanotubes with self-assembled patterns.     

激光片光三维传感中提高深度分辨率的方法

提出了两种在激光片光三维传感中降低散斑噪声、提高深度分辨率的方法。第1种方法采用宏观上相同、微观上受物体微结构面元影响的多帧散斑图像叠加,用于三维测量系统的标定。第2种方法利用动态采集方式,使CCD对微结构元进行时间积分,可有效地降低散斑噪声的影响。实验证明,综合利用这两种方式,深度分辨率可以得到有效的提高。     

干法制砂工艺收集石粉的应用分析

为了解决机制砂干法制砂工艺中石粉的收集利用问题，文中通过对江西东乡区域具有代表性的两种母岩材质的干法制砂收集石粉试验研究，以C30混凝土为例，每方分别掺入30、40、50、60 kg收集石粉时，对混凝土抗压强度、工作性能、经济性的影响情况。结果表明，随着石粉掺量的提高，混凝土浆体饱和度逐步提升，混凝土的抗压强度呈逐渐降低趋势，混凝土坍落度损失逐步增加。综合考虑，以控制掺入石粉掺量40 kg/m³为宜，通过适当提高混凝土减水剂掺量，混凝土工作性能得以改善，混凝土抗压强度得到提升，并产生良好的经济效益。