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中国科学院机构知识库网格

Chinese Academy of Sciences Institutional Repositories Grid

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	Application of trend extrapolation method to spectrum analysis of microtremor signal (EI CONFERENCE) 会议论文 OAI收割 2nd World Congress on Computer Science and Information Engineering, CSIE 2011, June 17, 2011 - June 19, 2011, Changchun, China Zhou X.; Guo T.; Jiao J. 收藏 \| 浏览/下载：29/0 \| 提交时间：2013/03/25 The trend extrapolation method is applied to spectrum analysis of microtremor signal in order to increase the spectral estimation accuracy. First establish an appropriate extrapolation model based on the existing data series and then fit correlation functions other than existing data by derivative least squares method finally perform spectrum analysis using extrapolated correlation functions. Numerical simulations and the experimental results show that good results are achieved no matter correlation functions change slow or rapid and the extrapolation error is not more than 2.3%. 2012 Springer-Verlag Berlin Heidelberg.
	Theoretical research of an improved C-V method to measure the elastic constants of nematic liquid crystal (EI CONFERENCE) 会议论文 OAI收割 Asia Display 2007, AD'07, March 12, 2007 - March 16, 2007, Shanghai, China Kong X.; Jin H.; Huang X.; Liao Y.; Liu J. e. 收藏 \| 浏览/下载：21/0 \| 提交时间：2013/03/25 A more exactitude C-V method to determine the elastic constants for nematic liquid crystal is discussed. For positive nematic liquid crystal(NLC) the threshold voltage becomes uncertain when the pretilt angle is not zero so the value of k11 must be erroneous. To solve this problem we report the formulas about capacitance and voltage with the pretilt angle isn't zero present the method to determine the elastic constants -k11 and k 33 simultaneously by curvefitting. We simulate and analyze the theory of this method in virtue of MatLab. The proposed method can reduce the requirement of LC cell increase the accuracy.