A total of 1939 receiver functions were obtained from 732 teleseismic events （M〉5.0） recorded at 21 broadband portable seis- mic stations on the Tengchong, Baoshan and Simao blocks and Yangtze platform. These stati...A total of 1939 receiver functions were obtained from 732 teleseismic events （M〉5.0） recorded at 21 broadband portable seis- mic stations on the Tengchong, Baoshan and Simao blocks and Yangtze platform. These stations were installed by the Institute of Crustal Dynamics, China Earthquake Administration during 2010 and 2011. Using the H-x stacking and searching method, crustal thickness and velocity ratio beneath the stations are obtained. Results show that crustal thickness and Poisson＇s ratio in- ferred from the velocity ratio clearly vary, and they illustrate block features in deep structures. Except for the Tengchong block crustal thickness increases from south to north along the same block and from west to east across different blocks. In the Yangtze platform, Poisson＇s ratio and crustal thickness show a consistent and significant increasing trend from south to north, possibly indicating that crustal thickening is caused mainly by lower crustal variations. In contrast, Poisson＇s ratio has no sig- nificant change within the Baoshan and Simao blocks. Such differences demonstrate that the Jinshajiang-Red River fault is a southern boundary of the South China block. The H-κ results inferred from three portable stations on the Tengchong block show high Poisson＇s ratios, but they vary clearly with back-azimuth, implying the existence of strong anisotropy in the crustal medium beneath the stations.展开更多
Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done ...Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done under crown measuring more than 4 satellites by synchronous measure, positioning precision is less than ±5 m. When measure time is more than 20 minutes. In addition, why differential\|positioning precision is better has been analyzed.展开更多
研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记...研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记录一次观测值,4天一共获得4组特征点的坐标.然后通过对每组坐标值求均值和标准差的方法处理数据.在对处理结果进行比较和分析后,得出随着观测时间的延长,观测值会变得更加精确,经过20 m in左右的时间,经度坐标的误差会稳定在一个较小的范围内;经过27 m in左右的时间,纬度坐标的误差会稳定在一个较小的范围内.展开更多
由于科技的发展,智能便携设备尤其是智能手机越来越多样化、功能集成化,在过去的几十年里,手机的显示屏分辨率以及摄像模组的像素不断提升,对接口的数据传输速度提出了更高要求,整个产业的各家厂商急需制定一个统一的标准来规范化不同...由于科技的发展,智能便携设备尤其是智能手机越来越多样化、功能集成化,在过去的几十年里,手机的显示屏分辨率以及摄像模组的像素不断提升,对接口的数据传输速度提出了更高要求,整个产业的各家厂商急需制定一个统一的标准来规范化不同模组之间的通信,便于智能设备的集成化和标准化,由此诞生了一系列的标准协议。移动产业处理器接口(mobile industry processor interface,MIPI)从整个技术产业链的完备性角度来说,由于技术发展更加完备,更加突出便携应用的特点,当前已逐步成为手机产业的主流标准。介绍了MIPI的发展和应用,MIPI显示接口电路的基本结构和设计难点,并对其发展和产业布局进行了分析。展开更多
基金supported by the National Natural Science Foundation of China(Grant No. 40974021)Basic Science and Research Special Project(Grant No. ZDJ2012-19)
文摘A total of 1939 receiver functions were obtained from 732 teleseismic events （M〉5.0） recorded at 21 broadband portable seis- mic stations on the Tengchong, Baoshan and Simao blocks and Yangtze platform. These stations were installed by the Institute of Crustal Dynamics, China Earthquake Administration during 2010 and 2011. Using the H-x stacking and searching method, crustal thickness and velocity ratio beneath the stations are obtained. Results show that crustal thickness and Poisson＇s ratio in- ferred from the velocity ratio clearly vary, and they illustrate block features in deep structures. Except for the Tengchong block crustal thickness increases from south to north along the same block and from west to east across different blocks. In the Yangtze platform, Poisson＇s ratio and crustal thickness show a consistent and significant increasing trend from south to north, possibly indicating that crustal thickening is caused mainly by lower crustal variations. In contrast, Poisson＇s ratio has no sig- nificant change within the Baoshan and Simao blocks. Such differences demonstrate that the Jinshajiang-Red River fault is a southern boundary of the South China block. The H-κ results inferred from three portable stations on the Tengchong block show high Poisson＇s ratios, but they vary clearly with back-azimuth, implying the existence of strong anisotropy in the crustal medium beneath the stations.
文摘Based on coordinates differential modes, using Portable GPS Receiver by near\|real time process, the positioning precision is about ±5 m. It can be used in forest to do many positioning. Position test to be done under crown measuring more than 4 satellites by synchronous measure, positioning precision is less than ±5 m. When measure time is more than 20 minutes. In addition, why differential\|positioning precision is better has been analyzed.
文摘研究了在进行GPS静态绝对定位时,误差经过多长时间会稳定在一个较小的范围内.在研究过程中,先是使用手持GPS接收机分4天对某一特征点采取静态绝对定位的方法来获取实验数据,每天的定位时间为1 h,都是从上午10:00到11:00,每隔1 m in,记录一次观测值,4天一共获得4组特征点的坐标.然后通过对每组坐标值求均值和标准差的方法处理数据.在对处理结果进行比较和分析后,得出随着观测时间的延长,观测值会变得更加精确,经过20 m in左右的时间,经度坐标的误差会稳定在一个较小的范围内;经过27 m in左右的时间,纬度坐标的误差会稳定在一个较小的范围内.
文摘由于科技的发展,智能便携设备尤其是智能手机越来越多样化、功能集成化,在过去的几十年里,手机的显示屏分辨率以及摄像模组的像素不断提升,对接口的数据传输速度提出了更高要求,整个产业的各家厂商急需制定一个统一的标准来规范化不同模组之间的通信,便于智能设备的集成化和标准化,由此诞生了一系列的标准协议。移动产业处理器接口(mobile industry processor interface,MIPI)从整个技术产业链的完备性角度来说,由于技术发展更加完备,更加突出便携应用的特点,当前已逐步成为手机产业的主流标准。介绍了MIPI的发展和应用,MIPI显示接口电路的基本结构和设计难点,并对其发展和产业布局进行了分析。
