空间飞行器

Comparing with satellite and aerocraft,stratospheric balloon-borne gondola get an advantage of low cost,long life,low risk etc.,so it has a good future to replace satellite and aerocraft to a degree applied to the field of telecommunication and aerospace science research.

具有成本低、寿命长、风险小等优点，在一定程度可取代成本高昂的卫星和空间飞行器。用于通信领域和空间科学研究领域，具有十分广阔的应用前景。

The average electron density in the linear attenuation zone is about 10^-5 of neutral particle density, and can diffuse over a wide rarea, The conclusion will supply some valuable references to the research of electromagnetic wave and artificial plasma interaction, the plasma invisibleness research of missile and special aerocraft,and the design of artificial plasma source.

平缓衰减区中的平均电子密度约为中性分子密度的十万分之一。并且可以覆盖较大范围。这些结果对于电磁波与人工等离子体相互作用的研究、导弹和空间飞行器的等离子体隐身研究及人工等离子体发生器的设计有一定的参考价值。

With the development of Chinese spaceflight business, accuracy requirement of orbit determination for the spacecraft will be more and more high.

随着我国航天事业的发展，对空间飞行器的定轨精度要求越来越高。

In the space orbit environment, the continuous variation in temperature levels and the temperature gradients will...

在空间轨道环境下，由于冷热交变和较大的温度梯度的存在会引起空间飞行器部件产生一定的热变形。

Used of an aircraft, a rocket, or a space vehicle.

用于飞机、火箭或空间飞行器

Propulsion system ; liquid rocket engine ; near space vehicle ; bipropellant

推进系统；液体火箭发动机；近空间飞行器；双组元推进剂

By diffusion of heavy metal ion into zinc oxide crystal,ACR-1 white antistatic thermal control coating is developed with acrylic resin.The space environment effects on the solar absorbtance of the coating and comparison with silicon white thermal control coating are investigated.

通过在氧化锌晶格中掺入重金属离子，得到具有防静电功能的白色颜料，再以丙烯酸树脂为粘合剂制备出空间飞行器外表面用的 ACR-1防静电白色热控涂层；研究了空间环境效应(包括紫外辐照，电子和质子辐照)对该热控涂层太阳吸收率的影响并与有机硅白色热控涂层进行了比较。

The paper introduces the launch modes and characteristics of the high speed and low speed near space aerocraft.

介绍了高速临近空间飞行器和低速临近空间飞行器的发射方式和特点。

To solve the nonlinear attitude control problem of a class of spacecrafts, the strongly coupled dynamics model is decomposed into some subsystems and the coupling between the subsystems, unmodelled dynamics and exterior disturbances are regarded as the uncertainty of the system.

引 言空间飞行器的姿态控制系统是一个具有参数摄动和外来干扰的非线性系统。滑模控制(Slidingmode control，SMC)对系统参数的不确定性和干扰具有较强的鲁棒性[1，2 ] ，近来越来越多地被用于对空间飞行器的控制，但滑模控制的输出存在高频抖振。

It is therefore of great significance for gyro-less spacecraft and can serve as a backup to increase system reliability for spacecraft with gyros.

这对于无陀螺的空间飞行器无疑具有重要的意义，对于有陀螺的空间飞行器，也可以用于备份，提高系统的可靠性。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了