Research of Retrieving Sea Surface Wind Vectors Based on Sentinel-1A Satellite SAR Images

海面风场是海气交互界面的重要物理参数，与海洋中绝大多数的海水运动密切相关。海面风场还是海气相互作用的重要媒介，调节了海水和大气之间的物质以及能量输送，对全球气候调节也有着十分重要的作用。 船舶、浮标等观测手段花费高昂，加上海洋面积巨大，可获得的现场海面风场数据十分有限，很难满足大面积海面风场的观测需求。日益发展的卫星遥感技术，为大面积观测风场提供了可能，微波散射计已经成为大面积获取全球海面风场的最重要遥感手段之一，不过微波散射计的空间分辨率通常为25-50km，难以满足对高分辨风场的需求。相比于散射计或辐射计，合成孔径雷达(SAR)同样具有全天时、全天候观测海洋的能力，同时其通过距离向的脉冲...Ocean surface wind field is an important parameter of ocean-air interface, it is related with most of the seawater movements. Surface wind is also the medium of ocean-air interaction, which may adjust the matter and energy transformation between ocean and air. So it is important for the global climate change. Traditional wind measurements using ships or buoys cost a lot. And the wind data is too ...学位：理学硕士院系专业：海洋与地球学院_物理海洋学学号：2232013115135

A new technique of rehabilitation training based on motor imagine using brain computer interface-func-tional electric stimulation system and it＇s effect on plasticity of brain of a stroke patient

目的:验证脑机接口结合功能性电刺激(BCI-FES)在中枢神经康复中的可行性及其机制。方法:对1例40岁男性脑卒中后左侧上肢重度瘫痪患者进行4周的基于运动想象的BCI-FES训练,训练前后各进行一次系统上肢功能评价及包含"运动"及"想象"组块的fMRI检测,进行功能激活图的绘制。结果:经过为期1个月的训练后左手最快抓握速度提高24.7%,左手抓握运动时功能性磁共振成像(fMRI)激活表现为出现病灶同侧主要运动区(M1)及辅助运动区(SMA)的激活,病灶对侧M1区及运动前区(PMC)激活较训练前减弱。左手运动想象任务时出现了双侧SMA及病灶同侧右后顶叶的激活。结论:脑机交互技术可促进脑卒中患者的中枢神经重塑。BCI-FES应用于存在脑损伤的脑卒中患者的康复训练是可行的。Objective： To study the feasibility of brain computer interface combined with functional electric stimulation （BC1-FES） applied to a patient with stroke as a new rehabilitation training system and to explore its mechanism. Method： The participant was a 40 years old man with severe left-hand paralysis after stroke. He received 4 weeks training with BCI-FES system based on motor imagine. The motor function of upper limb was assessed and fMRI examination was conducted pre- and after training. Result： Maximum grasp-relax speed of affected hand increased by 24.7% after training. When motion task was executed the activations in primary motor area（M1） and supplement motor area（$MA） of ipsilateral hemisphere were observed with fMRI after training, and eontralateral activations in M1 and premotor eortex（PMC） decreased in addition. When motor imagine task was executed, the activations transferred to bilateral SMA and ipsilateral posterior parietal after BCI training. Conclusion： BCI-FES was a kind of feasible rehabilitation therapy for stroke survivor. The mechanism of func- tional recovery by using BCI-FES was to promote the plasticity of central nervous system