检索结果-南通市图书馆

第十三届中国卫星导航年会

作者： Lei REN Tian-He XU Yu-Guo YANG Dong-Dong AN 1001 Factory of PLA Institute of Space Science Shandong University State Key Laboratory of Geo-information Engineering School of Space Science and Physics Shandong University

In order to further improve the measurement accuracy of vertical deviation and expand the application of astrogeodesy. Based on the theory of astrogeodesy, combined with the real-time PPP provided by BDS-3 and Digital Zenith photographing positioning model, this paper analyzes the principle and related work flow of the vertical deviation in detail, gives the relevant error correction model of the real-time PPP, and deduces the error calculation model in the measurement of Helmert vertical deviation. Through theoretical analysis and actual measurement verification, The real-time PPP provided by BDS-3 PPP-B2 b signal is better than 0.1 m in the horizontal direction and 0.2 m in the elevation direction under static measurement mode. combined with the current high-precision zenith photograph positioning system, the vertical deviation measurement accuracy can be better than 0.06’’ in the meridian component and 0.08" in the unitary component. The research results can provide theoretical and data reference for the establishment of high-precision gravity field model and geoid refinement in China.

关键词： vertical deviation Real-time precise single point positioning Digital Zenith photography positioning Astrogeodesy

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Surgical outcomes for unilateral superior oblique palsy in Chinese population: a retrospective study

引用

International Journal of Ophthalmology(English edition) 2015年第1期8卷 107-112页

作者： Gordon Shing Kin Yau Victor Tak Yau Tam Jacky Wai Yip Lee Theo Tak Kwong Chan Can Yin Fun Yuen Department of Ophthalmology Caritas Medical Centre Department of Anatomy Faculty of MedicineUniversity of Hong Kong

AIM: To evaluate the outcome after surgery for unilateral superior oblique(SO) palsy in ***: The medical records of 39 patients that underwent surgery for unilateral SO palsy between January 2003 and December 2012 at Caritas Medical Centre, Hong Kong, were retrospectively reviewed. All surgeries were performed by a single surgeon. Pre-operative assessments for vertical deviation, cyclo-deviation, and Knapp’s classification were obtained to determine the nature and degree of surgical *** deviation was measured at 1wk; 1, 6mo and on last follow-up day post-operatively. Cyclo-deviation was measured on last follow-up day ***: During the 10 y period, 39 subjects were recruited. The most common etiology was congenital(94.9%). Knapp’s Type III(66.7%) and Type I(12.8%)classifications were the most common subtypes. To treat SO palsy, the most common surgical procedures were:isolated inferior oblique(IO) anteriorization(41.0%),isolated IO myectomy(10.3%), and isolated IO recession(10.3%). At 3.5 ±2.1y post-operatively, the vertical deviation was significantly reduced(15.1 ±6.2 PD versus0.5±1.4 PD, P deviation(P =0.5). Initial vertical deviation was correlated with cyclo-torsion(r =0.4, P =0.007). Those with over-correction had greater initial vertical deviation(19.4±7.2 PD versus 13.2±4.3 PD, P =0.003). After a single operation, 84.6% of subjects achieved a vertical deviation within ±3 PD.· CONCLUSION: The majority of subjects achieved corrected vertical deviation after a single surgery although there was no improvement in *** with over-correction of primary position deviation had greater preoperative vertical deviation and it may be related to simultaneous multiple muscle surgery.

关键词： superior oblique palsy vertical deviation surgery diplopia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

vertical deformation of the fault-crossing network around Baotou,observed by GPS

引用

Geodesy and Geodynamics 2013年第4期4卷 57-61页

作者： Qin Shanlan Du Weiji Ji Lingyun Second Crust Monitoring and Application Center China Earthquake Administration Nanjing Institute of Surveying Mapping & Geotechnical InvestigationCo.Ltd

GPS data and precise leveling data of seismic network profiles across the fault in Baotou in 2006, 2009 and 2011 were processed and analyzed to test the feasibility of using GPS technology for fault-crossing vertical deformation monitoring. The results showed that high precision cross-fauh vertical deformation measurements can be obtained using appropriate GPS data processing strategies.

关键词： fault-crossing precise leveling vertical deformation GPS vertical deviation mapping function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：