航天学

This paper introduces the geneses and developing of digital compass in brief. Also expatiates digital compass s background theory , including airmanship spatial orientation theory and attitude dynamics etc.

本文简要介绍了数字航向仪的起源与发展状况，并介绍了数字航向仪的相关理论背景，包括航天导航技术、空间定位学和姿态动力学等理论。

The evaporation of nanofluid droplet will be widely applied in the field of vehicle,spaceflight, voyage,shipping and electron.The hydrokinetics,the theory of heat and mass transfer,the material science and the behavior dynamics of free interface are involved in the process of the nanofluid droplet evaporation.It is academically significant and has invaluable application to master the heat and mass transfer mechanism in this process.

纳米流体液滴蒸发形式的换热将广泛应用于车辆、航天航空、船舶、电子等领域，其蒸发过程是涵盖了多组分流体动力学、传热传质学、材料科学及自由界面行为动力学等多种学科领域的综合性问题，掌握该过程中的热质传递机理有着重要的学术意义和应用价值。

A method for star scene simulation by means of planetarium is presented, and a mathematical model based on matrix theory for star scene simulat...

通过计算机解算数学模型，并实时地控制星象仪运动，将能使受训者在航天模拟中，看到精确而逼真的星空景象。

I learned a lot of space knowledge there and watched rocket launch15 times.

我在那儿学到了很多关于航天的知识，看过有15次的火箭发射。

During the actual production, that the oxygen contamination from the crucible material by heat composition increases the oxygen content of molten steel will result in melting losses of the alloys in the molten steel, and will results in more heavier melting losses of the alloys, incontrollable exact chemical content of molten steel, increment of oxide inclusions and bad processability and serviceability, especially in the high strength(σb≥1600MPa) steels and alloys with special performance used in aerospace industry, manufacturing industry for precision instruments and meters, military industry, nuclear industry etc. because these steels usually have a high content of some active alloys such as Ti, V, Nb, Al, RE, etc. and a nearly zero content of dissolved oxygen.

实际生产中，如果炉衬热分解向钢液供氧，势必会造成钢液中合金元素的烧损，尤其是在航空航天、精密仪器仪表制造、军工及核工业部门使用的某些具有特殊性能的高强度(抗拉强度σb≥1600MPa)合金或钢材，因它们通常需要具有较高的活泼合金元素(如Ti、V、Nb、Al、RE等)含量，且钢中溶解氧含量接近于零，炉衬热分解供氧将造成这些合金元素的大量烧损，其结果是钢液化学成分难以精确控制，并增加了氧化物夹杂含量，恶化了钢的加工和使用性能。

On the hopeful 21st century, the rapid development of information, biotechnology, energy resources, environment, advanced manufacturing technology and national defense have produced the new demand for materials. More and more small size of materials will meet the demand of miniatured, intelligent, highly integrated, densely memorized and super fast transmission element. Aerospace industry, up-to-date military equipment, advanced manufactured technology and so on has required better and better properties.

中文题名有机高分子－无机纳米复合粒子改性高分子材料的力学性能－相态与群子标度之间关系的研究副题名外文题名 Studies on the relationship of mechanical properties-morphology and sub-cluster parameters of polymer materials modified by organic polymer-inorganic nanocomposite particles 论文作者权英导师金日光教授学科专业材料学研究领域\研究方向学位级别博士学位授予单位北京化工大学学位授予日期2002 论文页码总数177页关键词纳米材料高分子材料纳米复合材料纳米粒子馆藏号BSLW /2003 /TB383 /7 在充满生机的21世纪，信息、生物技术、能源、环境、先进制造技术和国防的高速发展必然对材料提出新的需求，元件的小型化、智能化、高集成、高密度存储和超快传输等对材料的尺寸要求越来越小；航空航天、新型军事装备及先进制造技术等对材料性能要求越来越高。

The simulation results are encouraging and show that neurocomputation could play important role in control of the future spaceships.

本文给出的仿真结果显示出神经计算学在航天飞行器控制问题中所具有的潜在能力。

The six spacemen now had moved to their special accommodation to be quarantined and to adjust their psychological conditions for the mission.

目前，六名航天员正在接受封闭式特殊膳宿，以便为本次任务调整到最佳身体状态。阅读本篇新闻，我们可以学到以下关于航天飞行的表达方式

I learned a lot of knowledge about spaceflight at there,and also saw the rocket's blast-off for 15 times.

我在那儿学到了很多关于航天的知识，看过有15次的火箭发射。

Concerning the alien ruins discovered in Zone 67, we continue to find evidence of an advanced culture with a superlative grasp of mathematics and astrogation, WITH some possible artistic representations that suggest a space-faring race (see attached digital images of onyx carvings).

关于67号地区外星人遗址的挖掘工作，我们继续寻找掌握了先进数学和航天学知识的高等文明存在的证据，一些可能的艺术图象暗示了一个太空旅行种族（参见奥星雕刻的数码照片）。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。