“信使”水星探测器圆满完成任务美国

来源 :国际太空 | 被引量 : 0次 | 上传用户:wanglijun123456789
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
1人类探测水星的历史  相对于火星探测的如火如荼,水星更像是被人遗忘的星球。到目前为止,人类仅有两次以水星为主任务目标的探测活动。究其原因,一是由于水星是太阳系最内侧的星球,对探测器的热控系统要求很高;二是由于水星上存在生命的概率基本为零,因此人类对探测水星热情不高。
其他文献
中国电力企业联合会秘书长王永干日前在京表示,预计今年下半年全国电力供需形势依然紧张,但进入四季度后,供需缺口将明显缩小;自实施煤电价格联动以来,发电企业的经营状况已
The problem of linear systems subject to actuator faults(outage,loss of efectiveness and stuck),parameter uncertainties and external disturbances is considered.
This paper investigates the fnite-time consensus problem of multi-agent systems with single and double integrator dynamics,respectively.Some novel nonlinear pro
Discrete linear quadratic control has been efciently applied to linear systems as an optimal control.However,a robotic system is highly nonlinear,heavily couple
2015年3月30日21:52,我国在西昌卫星发射中心用长征-3C/远征-1运载火箭成功发射了首颗“北斗”全球导航试验卫星,它标志着我国“北斗”卫星导航系统由区域运行向全球拓展的启动
1 电磁流量指示不准的危害rn由于水煤浆特殊的物理特性,使其测量难度很大.经多年煤化工装置运行经验证明,采用水煤浆电磁流量计测量水煤浆流量是目前唯一可靠的方式.为了保证
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
In this paper,we propose a new prediction from expert demonstration(PED)methodology to improve reliability and safety in tele-surgery.Data was collected from ex
Consciousness research has been of great concern to philosophers,psychologists and neuroscientists in recent years.At the same time,consciousness has also attra
An assistive robot is a novel service robot,playing an important role in the society.For instance,it can amplify human power not only for the elderly and disabl