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排序方式： 共有65条查询结果，搜索用时 15 毫秒
1.
The paper is focused on the analysis of the drift of tabular iceberg observed in 2009 in the marginal ice zone of the North-West Barents Sea. Momentum balance equations are derived from the Kirchhoff equations describing plane motion of solid body in an ideal fluid. Field works performed on the drift iceberg and on the drift icenear the iceberg are described. Results of the field works and numerical simulations of the iceberg drift and rotation are performed and discussed. It is shown that acceleration of water flow around the iceberg has visible influence on the iceberg drift. Kinetic energy balance of drift iceberg is used to estimate the forces applied to the iceberg by the drift ice. 相似文献
2.
羌塘地块中生代时期的漂移演化及其成钾条件 总被引：1，自引：0，他引：1
通过研究地块的古纬度,可以为我们认识该地块在地质历史时期的古地理位置和南北向漂移演化提供定量约束。本文通过收集、整理、评判中生代时期羌塘地块已发表的古地磁数据,建立了该地块在中生代时期的漂移演化历史。羌塘地块在中—晚三叠世期间,可能发生大规模快速北向漂移,并与羌塘北部的构造单元体发生碰撞;中侏罗世时期位于北半球21.4°N,晚侏罗世期间已北向到达31.8°N。中晚侏罗纪期间,羌塘地块古纬度值逐步升高,发生约1154±223km(△λ=10.4°±2.1°)的北向漂移。白垩世期间羌塘地块相对稳定,在古纬度30°N左右。综合上述羌塘地块的漂移演化历史,结合其它地质证据,如古气候、构造和从古地理位置等,中晚侏罗世夏里组时期羌塘地块具备较好的成钾条件。 相似文献
3.
Based on the reanalysis data of monthly mean global SST and wind from the NCEP/NCAR and the observation data of rain seasons in 124 stations of Yunnan province from 1961 to 2006, we applied the analytical methods of correlation analysis and composite analysis and a significance testing method to two sets of samples of average differences. The goal is to investigate into the influence of the Southern Hemispheric (SH) SST on the summer precipitation in Yunnan from January to May so as to identify the key time and marine regions. Physical mechanisms are obtained by analyzing the influence of sea level wind and the key marine regions on the precipitation during Yunnan’s rain season. Results show that there is indeed significant relationship between the SST in SH and summer precipitation in Yunnan. The key areas for influencing the summer precipitation are mainly distributed in a region called “West Wind Drift” in the SH, including the Southeast Indian, southern Australia, west coast of eastern Pacific off Chile, Peru and the southwest Atlantic Magellan. Besides, the most significant marine region is the west coast of Chile and Peru (cold-current areas of the eastern Pacific). Diagnostic analysis results also showed that monsoons in the Bay of Bengal, a cross-equatorial flow in the Indian Ocean near the equator and southwest monsoon in India weaken during the warm phase of the Peruvian cold current in the eastern Pacific. Otherwise, they strengthen. 相似文献
4.
5.
本文介绍一种利用相邻多站卫星闪烁信号之间相关性测量电离层不均匀结构漂移速度的方法.实验分析结果表明秋分前后我国低纬(海口)地区电离层不均匀结构的漂移速度在50~110 m/s之间,方向为东向.地方时22:00之前漂移速度的值变化较大,之后相对比较稳定.对同一次电离层闪烁事件,取不同采样长度的数据进行处理,得到的漂移速度整体上的变化趋势基本一致.结果表明,该方法是一种有效可行的方法,时间分辨率可以达到1 min. 相似文献
7.
8.
本文阐述了利用GPS接收机台阵测量到的闪烁和TEC变化率ROT快速起伏图样估计F层不规则结构漂移的原理和方法,并利用实测数据估计了静日和暴时电离层不规则结构的水平漂移速度.短间距台网和超短间距台链观测实例的计算结果表明，暴时武汉地区引起TEC快速起伏的电离层不规则结构沿纬圈向西漂移，21∶30至03∶00 LT,西向漂移速度在约40 m/s至130 m/s的范围内变化；在桂林地区，磁静日午夜前后引起L波段电波闪烁的电离层不规则结构沿纬圈向东漂移，漂移速度从约70 m/s下降到约55 m/s，磁扰日午夜前不规则结构向西漂移，速度从约150 m/s下降到约50 m/s，午夜后转为向东漂移，速度从约25 m/s上升到约65 m/s.文中还提出了由单站多卫星观测估计F层不规则结构漂移的设想.实例分析与计算结果表明，利用单站多卫星观测估计电离层不规则结构漂移是一种合理可行的方法. 相似文献
9.
It is shown that the drift waves near the light cylinder can cause the modulation of emission with periods of order several
seconds. These periods explain the intervals between successive pulses observed in AXPs, SGRs and radio pulsars with long
periods. The model under consideration gives the possibility to calculate real rotation periods P of host neutron stars. It is shown that P≤1 s for the investigated objects. The magnetic fields at the surface of the neutron star are of order 1011–1013 G and equal to the fields usual for the known radio pulsars.
相似文献
10.
1. Introduction It is believed that the transport of freshwater intothe high northern oceans plays a major role in thecirculation in the Nordic Seas and the Atlantic (andpossibly the World) Ocean since it passes convectiveregimes of major importance to … 相似文献