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Error-immune Algorithm for Absolute Testing of Rotationally Asymmetric Surface Deviation
Yanwei Zhang,Dongqi Su,Le Li,Yongxin Sui,Huaijiang Yang 한국광학회 2014 Current Optics and Photonics Vol.18 No.4
Based on Zernike polynomial fitting, we propose an algorithm believed to be new for interferometric measurements of rotationally asymmetric surface deviation of optics. This method tests and calculates each angular surface by choosing specified rotation angles with lowest error. The entire figure can be obtained by superimposing these sub-surfaces. Simulation and experiment studies for verifying the proposed algorithm are presented. The results show that the accuracy of the proposed method is higher than single-rotation algorithm and almost comparable to the rotation-averaging algorithm with fewer rotation measurements. The new algorithm can achieve a balance between the efficiency and accuracy.
Dong, Qi,Bao, Han,Lee, Byunghong,Kim, Jeong Wan,Bae, Mun Ki,Park, Yeong Min,Choi, Hyun-Kuk,Yoon, Su Jong,Kim, Tae Gyu American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>In this study, a series of PAN nanofibers with MWCNTs contents range from 1.96 wt% to 5.66 wt% were successfully prepared by electrospinning technique, and thermal conductivity and electrical resistivity were investigated. Firstly, the nanofibers were electrospun, and stabilization and carbonization reactions then occurred by a tube furnace at 280 degree and 1000 degree. The structural features of the obtained composite carbon nanofibers were characterized using scanning electron microscopy (SEM), X-ray diffractometer system (XRD), and Raman spectroscopy. The average thermal diffusivity was measured by using a Laser Flash Analyzer (LFA). The electrical resistivity was evaluated via Sheet Resistance Measurement. With the increasing the mass fraction of MWCNTs to 5.66 wt%, thermal conductivity was conspicuously increased by 33% and electrical resistivity was decreased 80 times.</P>