航天

For debris objects in a given altitude or inclination bin, the average rate of crossing the radar fence is derived.

随着载人航天与空间站等航天活动的增多，不能有效防护、也无法定期跟踪和编目的小尺寸（尤其是1~10cm）碎片的危害越来越受到关注，这些碎片信息的获取依赖于统计采样技术。

Based on the analysis method of radiometric sensitivity that is given in the dissertation, the analysis and calculation software of radiometric sensitivity is established.

本文给出航天遥感器的辐射灵敏度的分析方法，并以此为基础编制了航天遥感器辐射灵敏度的计算软件。

The equations of radiometric accuracy and software are given.

本文给出航天遥感器的辐射度精度公式，并建立航天遥感器的辐射度精度计算软件。

Astronautics ; Launch vehicle ; Rocket engine ; Aerospace industry

航天；运载火箭；发动机；航天工业

The different leak detecting technologies are used in the fields as ground environmental simulation experiment equipment,liquid rocket,satellite_borne instruments,vehicle and railway LH 2 tank.

为此 ，根据地面环模试验设备、液体运载火箭、星载仪器、卫星、飞船及铁路液氢槽车等设备的具体情况，采用不同的检漏方法，解决了航天工程设备漏气技术的难题，确保了航天工业产品的质量。

Dr. Tsien's father's cousin was Tsien Hsue-shen, father of Chinese rocketry and a major figure in the missile and space programs of both the United States and China, who contributed greatly to China's aerospace industry.

钱博士的叔父是钱学森，他是中国火箭之父，同时也是美国和中国在导弹和航天领域的重量级人物，他为中国航空航天工业做出了巨大贡献。

Space mission simulation is the key technology means of ananlys and design of space mission.

中文摘要航天任务仿真是进行航天任务分析与设计的重要技术手段。

The linear transient eddy current electromagnetic field problem for determining solution is characterized by replacing the interface condition of the tangential component of the electric field intensity by the interface condition of the normal component of the magnetic flux density, and ignoring the displacement current in the constraint equations.

谢莉 北京航空航天大学自动化科学与电气工程学院，北京 100083雷银照北京航空航天大学自动化科学与电气工程学院，北京 100083线性瞬态涡流电磁场定解问题的主要特点是边界条件使用磁感应强度的法向分量边界条件代替了电场强度的切向分量边界条件，约束方程中忽略了位移电流。

The company is engaged in developing and manufacturing rubber and plastic products for 30 years. The products includes vacuum seals, oil seals for automobile shock absorber, rubber corrugated hose for entering gas, break pump, vacuum assister, and various vacuum seals and plastic pieces used in aerospace. It is an assigned factory of China Aerospace Industry Corporation for producing vacuum seals. In the end of 2002, the company imported a nylon fuel oil pipe production line by joint capital.

公司从事橡塑制品的研制生产有三十年历史，产品覆盖汽车减震器、橡胶进气波纹管总成、制动泵、真空助力器的密封件、油封、各类减震功能的橡胶件及风扇叶等塑料、塑压件，航天使用的各种密封件、塑压件，是中国航天工业总公司密封件定点厂家。2002年底公司又合资引进了一条尼龙燃油管生产线，从事汽车用尼龙燃油管总成的加工生产。

In the present study, head-down tilt bed rest was used to simulate microgravity. We observed and compared the effects of lower limb muscular exercise with bicycle ergometric exercise during 30 days of -6°HDT bed rest on the responses of lower limb muscle and cardiovascular systems.

采用何种体育锻炼方法才能够最有效地预防和对抗航天失重环境对机体的影响，仍然是航天医学所面临的主要问题之一。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。