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• 地质与地球物理研究所 [4]
• 长春光学精密机械与物... [3]
• 地理科学与资源研究所 [1]
• 数学与系统科学研究院 [1]
• 自动化研究所 [1]

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• OAI收割 [10]

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• 期刊论文 [6]
• 会议论文 [3]
• SCI/SSCI论文 [1]

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• 2016 [1]
• 2015 [2]
• 2010 [1]
• 2009 [4]
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浏览/检索结果: 共10条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 A simple method to extract tropical monsoon forests using NDVI based on MODIS data: A case study in South Asia and Peninsula Southeast Asia SCI/SSCI论文  OAI收割 2016 作者:  Lin S.;  Liu, R. G.   |  收藏  |  浏览/下载：26/0  |  提交时间：2017/11/09 monsoon forest  Moderate Resolution Imaging Spectroradiometer (MODIS)  Normalized Difference Vegetation Index (NDVI) amplitude  threshold  classification  land-cover classification  seasonal forests  carbon balance  dry  forests  index  agreement  dynamics  thailand  regions  images   Regional differences in crustal structure of the North China Craton from receiver functions 期刊论文  OAI收割 SCIENCE CHINA-EARTH SCIENCES, 2015, 卷号: 58, 期号: 12, 页码: 2200-2210 作者:  Wei ZiGen;  Chu RiSheng;  Chen Ling   |  收藏  |  浏览/下载：31/0  |  提交时间：2017/11/27 North China Craton  Moho depth  Poisson's ratio  gravitational equilibrium  receiver function amplitude  regional difference in crust   Dither modulation of significant amplitude difference for wavelet based robust watermarking 期刊论文  OAI收割 Neurocomputing, 2015, 卷号: 166, 期号: 1, 页码: 404-415 作者:  ChunLei Li;  Zhaoxiang Zhang;  Yunhong Wang;  Bin Ma;  Di Huang   |  收藏  |  浏览/下载：27/0  |  提交时间：2017/02/09 Significant Amplitude Difference  Dwt  Robust Watermarking  Dither Modulation   Analysis of a diffractive microlens using the finite-difference time-domain method (EI CONFERENCE) 会议论文  OAI收割 作者:  Liu Y.;  Liu H.;  Liu H.;  Liu H.;  Liu Y. 收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25 The finite-difference time-domain (FDTD) method is used as rigorous electromagnetic analysis model to calculate the field for a diffractive microlens (DML). The FDTD is used for the entire solution rather than using a near- to far-field propagation method to obtain the far-field energy distribution  thus  all the results are vector based. We derived a formula to calculate the magnitude of electric field  which is time dependent and can be used to graphically show the light wave propagation and focusing process through a DML. Both the comparison and the integral methods are presented to obtain wave amplitude in full solution space  and the distribution of light energy behind a DML is illustrated based on the wave amplitude. The formula of diffractive efficiency of the DML is derived from a time-averaged Ponyting vector  which can indicate the propagation direction of light energy. Application of these formulations in the analysis of a DML example demonstrates the high accuracy and efficiency of our method. 2010 Society of Photo-Optical Instrumentation Engineers.   Prestack AVP imaging method based on true amplitude one-way wave equation 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2009, 卷号: 52, 期号: 8, 页码: 2119-2127 作者:  Lue Bin;  Wang Xi-Wen;  Wang Yu-Chao;  Li Zhen-Chun;  Zhang Hui   |  收藏  |  浏览/下载：25/0  |  提交时间：2018/09/26 True amplitude  One-way wave equation  Fourier finite-difference  Common focusing point technology  AVP   Prestack AVP imaging method based on true amplitude one-way wave equation 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2009, 卷号: 52, 期号: 8, 页码: 2119-2127 作者:  Lue Bin;  Wang Xi-Wen;  Wang Yu-Chao;  Li Zhen-Chun;  Zhang Hui   |  收藏  |  浏览/下载：27/0  |  提交时间：2018/09/26 True amplitude  One-way wave equation  Fourier finite-difference  Common focusing point technology  AVP   Rigorous vector analysis of diffractive microlens by using of finitedifference time-domain method (EI CONFERENCE) 会议论文  OAI收割 2009 International Conference on Optical Instruments and Technology, OIT 2009, October 19, 2009 - October 22, 2009, Shanghai, China 作者:  Liu Y.;  Liu H.;  Liu H.;  Liu H.;  Liu Y. 收藏  |  浏览/下载：36/0  |  提交时间：2013/03/25 We use finite difference time domain (FDFD) method as rigorous vector analysis model to simulate the focusing process of diffractive microlens (DML). Differing with most analysis model which the near field distributions are calculated by FDTD and then far field are obtained by using of propagation method  we obtain the fields in whole computational space by using of FDTD only. The advantages are that all the results are vector based and the computational time is saved greatly. In this paper  we present two methods to obtain wave amplitude  one is comparison method  and the other is integral method. Depending on wave amplitude in the whole computational space  one can conveniently obtain distributions of electric field intensity and calculate the time-average Poynting vector. We also present the formulation for calculating diffractive efficiency of DML based on time-average Poynting vector which denotes energy flow. As demonstration  a DML is analyzed by using of these algorithms. The time depended graphic results of FDTD show the process of wave propagation. The distribution of electric field intensity illustrates the focusing of the normal incident light. The focus pattern in the focal plane is also show. The diffractive efficiency of the DML is calculated by using of the energy flow method in this paper. The results show the high accuracy and efficiency of the model. 2009 SPIE.   Self-adaptive threshold canny operator in color image edge detection (EI CONFERENCE) 会议论文  OAI收割 2009 2nd International Congress on Image and Signal Processing, CISP'09, October 17, 2009 - October 19, 2009, Tianjin, China Luo T.; Zheng X.-F.; Ding T.-F. 收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25 It needs to set the two thresholds of classical Canny Operator manually  which confined this algorithm. A lot of research on adaptive thresholds choice method has been done to conquer this shortcoming. Based on the gradient histogram  which is studied constantly in the past  a method of gradient histogram difference diagram with adaptive image classification techniques is proposed in this paper. It automatically sets the two thresholds  and avoids disconnected or false edges in detection. Experiments prove that the method is threshold-adaptive and the edge detection performs well in color image whose larger gradient amplitude pixels are mainly located in the edges between the target and background. 2009 IEEE.   Feasibility analysis on division of flow units using time-lapse seismic data 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2007, 卷号: 50, 期号: 2, 页码: 592-597 作者:  Wang Da-Wei;  Liu Zhen;  Zhao Wei;  Chen Xiao-Hong;  Wu Xiang-Yang   |  收藏  |  浏览/下载：21/0  |  提交时间：2018/09/26 reservoir fluid flow units  time-lapse seismic  difference amplitude  fluid properties  reservoir physical parameters   True amplitude seismic migration operator in 3D heterogeneous medium 期刊论文  OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2004, 卷号: 47, 期号: 3, 页码: 509-513 作者:  Cui, XF;  Zhang, GQ;  Wu, YL   |  收藏  |  浏览/下载：12/0  |  提交时间：2018/07/30 one way wave equation  true amplitude migration  split step Fourier migration operator  Fourier finite difference migration operator