中国科学院机构知识库网格系统: 检索

Understanding the impacts of 'Grain for Green' land management practice on land greening dynamics over the Loess Plateau of China 期刊论文 OAI收割
LAND USE POLICY, 2020, 卷号: 99, 页码: 11
作者: Liu, Zhengjia; Wang, Jieyong; Wang, Xiaoyue; Wang, Yongsheng

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收藏 | 浏览/下载：40/0 | 提交时间：2021/03/15

The 'Grain for Green' practice GIMMS3g NDVI Spatial residual analysis The TPRC-based NDVI model The Loess Plateau

Understanding the impacts of 'Grain for Green' land management practice on land greening dynamics over the Loess Plateau of China 期刊论文 OAI收割
LAND USE POLICY, 2020, 卷号: 99, 页码: 11
作者: Liu, Zhengjia; Wang, Jieyong; Wang, Xiaoyue; Wang, Yongsheng

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收藏 | 浏览/下载：39/0 | 提交时间：2021/03/15

The 'Grain for Green' practice GIMMS3g NDVI Spatial residual analysis The TPRC-based NDVI model The Loess Plateau

Progress of economic geography in China's mainland since 2000 SCI/SSCI论文 OAI收割
2016
作者: Liu W. D.

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收藏 | 浏览/下载：39/0 | 提交时间：2017/11/09

economic geography intellectual development bibliometrics practice-based

Tracking error modeling of the theodolite based on GRNN method (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Frontiers of Manufacturing and Design Science, ICFMD 2011, December 11, 2011 - December 13, 2011, Taichung, Taiwan
作者: Li M.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

To meet the requirement of high tracking accuracy as well as develop more reasonable evaluation method in this paper the General Regression Neural Network (GRNN) has been applied to build the tracking error model of the theodolite. First we analyze the nonlinear factors in the theodolite. Second we discuss the principle of GRNN including its structure the function as well as its priors. Third we build the tracking error model based on GRNN and verify the model through the different parameters. The result indicated that the network model based on GRNN has high accuracy and good generalization ability. It could instead the real system to a certain extent. The research in this paper has important value to the engineering practice.

Bi-camera ranger-finder and error analyze based on binocular parallax (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Vibration, Structural Engineering and Measurement, ICVSEM2011, October 21, 2011 - October 23, 2011, Shanghai, China
Wang Z. C.; Dai M.; Huang J.; Wang Y. Y.; Chen X. L.; Gao Y. J.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

The traditional facilities that used to find range are mostly based on laser or ultrasonic. Now based on binocular parallax of human eyes we advance a method used to get the distance by measuring the offset on image panel. On this foundation we also analyze the error in forward. The academic analysis indicate that the measurement would be impacted severely by transverse offset and angle-measuring offset in contrast much slightly by lengthways offset. When we put this facility into practice this facility can suffice practical demand completely if we select the space between bi-camera and the focus of facility rationally. (2012) Trans Tech Publications Switzerland.

A parallel algorithm for medical images registration based on B-splines (EI CONFERENCE) 会议论文 OAI收割
4th International Congress on Image and Signal Processing, CISP 2011, October 15, 2011 - October 17, 2011, Shanghai, China
作者: Zhang T.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

Cubic B-splines is widely applied in non-rigid registration because of its approximation performance and fast computational characteristics. However a small scale non-rigid deformation is needed to characterize by a large number of control points. Moreover an iterative optimization strategy of the non-rigid registration algorithm and the normalized mutual information (NMI) cost a great quantity calculation. So the process of the non-rigid registration is slowed by calculations of NMI in a iterative optimization strategy. In this paper a parallel optimization algorithm based on cubic B-splines functions is proposed to parallelize the optimization algorithm of the nonrigid registration and the calculations of normalize mutual information. In practice a fast algorithm of cubic B-splines is used and the control points are only distributed on the targets. Experiments show that the use of the fast algorithm and the parallel optimization strategy improves the non-rigid registration process of medical images. 2011 IEEE.

Design of control system of DC motor based on fusion FPGA (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Mechatronics and Materials Processing, ICMMP 2011, November 18, 2011 - November 20, 2011, Guangzhou, China
Zhu D. D.; Li H. W.

收藏 | 浏览/下载：44/0 | 提交时间：2013/03/25

Along with the development of microelectronic process it is possible to integrate a big system in one chip. A new way to implement system on a chip is provided by the advent of FPGA. Based on Verilog HDL and the Actel Fusion AFS600 FPGA chip the speed closed-loop control system of DC motor was designed by using options of combining the top-down thinking and the bottom-up method. PID control algorithm encoder signal processing and PWM waveform generation etc were realized by the system. The results show that the system structure is simplified and the stability and reliability are improved. A solution of system on a chip is realized to some extent. It has extensive application value in engineering practice. 2011 Trans Tech Publications.

Distribution of gyroscope accuracy parameters for E-O stabilization platform (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.; Jiang H.

收藏 | 浏览/下载：41/0 | 提交时间：2013/03/25

E-O stabilization platform performance is partly decided by gyroscope precision so it is important to choose a gyroscope with proper accuracy for an E-O stabilization platform. Based on the method of using a gyroscope in practice gyroscope error model is established. With the gyroscope error model gyroscope accuracy parameters that is bias repeatability bias stability scale factor scale factor nonlinearity output noise and bandwidth are separately analyzed. According to the concretely required performance indices for an E-O platform means of distribution of gyroscope accuracy parameters is proposed. A MEMS gyroscope is tested to get the parameters. Bias stability of the gyroscope is 0.08 /s while the bandwidth is 60 Hz. Output noise both at zero input and at nonzero input is analyzed by means of PSD to get the result that nonzero output noise is higher than zero output noise. Frequency response result of the gyroscope is dealt by means of correlation analysis. With all the tested result and the method of distribution of gyroscope accuracy parameters it is clear that how the gyroscope errors works in an E-O servo system. The principle of distribution of gyroscope accuracy parameters is helpful for choosing appropriate gyroscope for an E-O platform. 2011 IEEE.

On the classification of granitic rocks based on whole-rock Sr and Yb concentrations III: Practice 期刊论文 OAI收割
ACTA PETROLOGICA SINICA, 2010, 卷号: 26, 期号: 12, 页码: 3431-3455
作者: Zhang Qi; Jin WeiJun; Li ChengDong; Wang YuanLong

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收藏 | 浏览/下载：33/0 | 提交时间：2018/09/26

ClassificatiOn Of Granitic Rocks Based On Sr And Yb cOncentratiOns Practice Crust Thickness Co-au Mineralization W-sn Mineralization

On the classification of granitic rocks based on whole-rock Sr and Yb concentrations III: Practice 期刊论文 OAI收割
ACTA PETROLOGICA SINICA, 2010, 卷号: 26, 期号: 12, 页码: 3431-3455
作者: Zhang Qi; Jin WeiJun; Li ChengDong; Wang YuanLong

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收藏 | 浏览/下载：32/0 | 提交时间：2018/09/26

ClassificatiOn Of Granitic Rocks Based On Sr And Yb cOncentratiOns Practice Crust Thickness Co-au Mineralization W-sn Mineralization