This paper is related to study of the ion density recorded by the low altitude satellite DEMETER. It will present ionospheric perturbations observed during large seismic events.As the ionosphere is hi
The electron density recorded onboard the DEMETER satellite was analyzed to search for possible anomalies before earthquakes both in space and time.To distinguish pre-earthquake anomalies from the oth
We investigated how density and quality of mesh around interest domain affect electromagnetic (EM) responses of 3D Earth layered media using finite element method(FEM).Effect of different mesh shapes
The satellite remote sensing has become a promising technique for detecting earthquake and fault activities.But it is still very difficult to exactly extract the earthquake anomaly from the complicate
Earthquake-related electromagnetic observation aims at finding abnormal electromagnetic variation associated with earthquake possibly.The existing studies have proved that this method is,to a large ex
Based on the case studies and statistical analysis of earthquake-related ionospheric disturbances mainly from DEMETER satellite,ground-based GPS and ionosounding data,this paper summarizes the statist
The study found that strong magnetic anomalies repeatedly took place before big earthquakes. Based on geomagnetic record analysis results,we discussed a possible pattern of the magnetic anomalies prio
用二维动画技术实现虚拟现实三维动感视听效果的实验过程,这是对Flash动画技术的挑战和尝试。虚拟实验仪器设备的绘制形象逼真,达到了仿真的视觉效果,声音的添加烘托出虚拟实验动画过程的听觉感受,视听的双重感受把观众带进了清新明亮的虚拟实验室。
This study was aimed at developing an efficient simulation technique with an ordinary PC.The work involved derivation of mathematical operators,analytic phantom generations,and effective analytical pr
船舶尾流边缘图像处理及压缩编码研究可用于实现尾流识别与探测.文中利用Canny检测器对船舶尾流图像边缘化处理,得到了边缘图像;通过对尾流边缘图像进行抽样、拟合,得到了拟合曲线和对应的多项式曲线及其方程;进行了傅里叶分析,定量描述了边界形状,利用50%个傅里叶描述子来重构原来的尾流边缘图像,可得到一个近似而不改变基本形状的图像;通过对尾流边缘图像进行离散余弦变换压缩实验,在压缩率为56%条件下,压缩