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浏览/检索结果: 共7条，第1-7条 帮助

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Can Livestock Raising Alleviate Farmland Abandonment?-Evidence from China 期刊论文  OAI收割
LAND, 2022, 卷号: 11, 期号: 8, 页码: 18
作者:  Song, Hengfei;  Xin, Liangjie;  Li, Xiubin;  Wang, Xue;  He, Yufeng
  |  收藏  |  浏览/下载：47/0  |  提交时间：2022/09/26
Can Livestock Raising Alleviate Farmland Abandonment?-Evidence from China 期刊论文  OAI收割
LAND, 2022, 卷号: 11, 期号: 8, 页码: 18
作者:  Song, Hengfei;  Xin, Liangjie;  Li, Xiubin;  Wang, Xue;  He, Yufeng
  |  收藏  |  浏览/下载：40/0  |  提交时间：2022/09/26
Remote monitoring for a high-speed railway subgrade structure state in a mountainous area and its response analysis 期刊论文  OAI收割
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT, 2018, 卷号: 77, 期号: 1, 页码: 409-427
作者:  Li, Jian;  Chen, Shanxiong;  Yu, Fei;  Dai, Zhangjun
  |  收藏  |  浏览/下载：35/0  |  提交时间：2018/06/05
Implementation of a fast simulation algorithm for terrain based on dynamic LOD (EI CONFERENCE) 会议论文  OAI收割
IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011, August 16, 2011 - August 18, 2011, Chengdu, China
作者:  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载：37/0  |  提交时间：2013/03/25
In-depth study and explore dynamic quad tree rendering of large-scale terrain. Investigated the problems  which was urgently to be solved  about quad tree. Studied the features and application of dynamic quad tree algorithm and static quad tree algorithm. Analyze and explore the problems about quad tree construction  data storage that is significant in modeling  removing of the grid back  and elimination of T-type fracture. In this study  an algorithm based on storage array was proposed on the basis of the previous research to eliminate T-type fracture. The results showed that the new algorithm not only enhance the streamline effect  but also increased the rendering speed in the large-scale virtual terrain rendering process. The draw rate was enhanced from 8-10 frames/s up to 20-23 frames/s. 2011 IEEE.  
基于libMini的动态地形实时渲染算法 期刊论文  OAI收割
计算机仿真, 2009, 卷号: 26, 期号: 6, 页码: 246-249
杨凯; 廖名学; 何晓新; 郑昌文
  |  收藏  |  浏览/下载：17/0  |  提交时间：2010/08/26
EFFECTS OF LAND-USE AND LAND-COVER CHANGE ON EVAPOTRANSPIRATION AND WATER YIELD IN CHINA DURING 1900-2000 SCI/SSCI论文  OAI收割
2008
Liu M. L.; Tian H. Q.; Chen G. S.; Ren W.; Zhang C.; Liu J. Y.
收藏  |  浏览/下载：43/0  |  提交时间：2012/06/08
Error analysis and test study of fiber optic gyroscope north-finder (EI CONFERENCE) 会议论文  OAI收割
Advanced Sensor Systems and Applications II, November 8, 2004 - November 12, 2004, Beijing, China
Zhang Z.; Sun J.; Wu K.
收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25
North-finder system is an important application of the inertial technology. It provides true north azimuth information to f all kinds of ground-based equipment. This paper designed a dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG). In this scheme  the sine output signal of the FOG was sampled and disposed  and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the base tilt was compensated by an accelerator. The output signals of FOG and accelerator were computed combined with the position sampled from increasing encoder by digital signal processor. Successive rotating technique was adopted to modulate the FOG signal periodically. Most of the low frequency part of random gyro drift errors was compensated. The north-finder accuracy was improved compared with the traditional static measuring method. The test result shows the FOG automatic north-finder obtains 2' true north angle accuracies within not more than three minutes  can meet the orientation need of artillery  terrain measurement vehicle  armored car  unmanned drive vehicle  geodetic survey and tunnel exploration.