在飞行中的

Honey is a widely known natural food. Bees gathered the nectar in flowers and take it back, then process and condense it into this translucence, sticky and thick sweet liquid. It's a tough job to gather nectar. A bee can only get 20mg nectar per time. To get 1kg nectar, the worker bee need to fly 500,000-600,000 times and to produce 1kg honey, a worker bee needs to gather the nectar from 1500-1600 flowers. If a bee gathers nectar just in a place one kilometer away from its comb, then it needs to fly 3 kilometers to fulfill a honey bursa. And to produce 1kg honey, it needs to fly 360,000-450,000 kilometers, which equals to fly around the earth for 8.5-11 circles. So it's not exaggerated to say each drop of honey is a crystal of hard working.

蜂蜜是大家熟悉的天然食品，系蜜蜂采集植物花朵内的花蜜，带回巢内经酿制加工浓缩而成的半透明黏稠甜液，蜜蜂采花蜜工作非常辛苦，一只蜜蜂一次只能携品20毫克的花蜜，采集1公斤的花蜜，工蜂要飞行50-60万次，而生产1公克的蜂蜜，工蜂要采集约1500-1600朵花的花蜜，如果蜜蜂在离开蜂巢1公里的地方采集花蜜，每采满一个蜜囊，而要飞行3公里，制造1公斤的蜂蜜需飞行36-45万公里，等于绕地球8.5-11周，可见瓶中蜜滴滴皆辛苦。

The reason why quaternion is used in flight simulation of fighter aircraft and the geometric meaning of quaternion are described,according to axis system used in flight simulation of fighter aircraft in China,three problems are introduced as follows:(1) quaternion kinematic equations,(2) relationship of quaternion and coordinate transformation matrix,(3) Euler angles in terms of quaternion.

阐述了在战斗机的飞行仿真中采用四元数的原因和四元数的几何意义，并按照中国战斗机飞行仿真中采用的坐标系，介绍了三个问题：四元数运动学方程；四元数与坐标变换矩阵的关系；用四元数表示的欧拉角。

In the process ofnavigation of INS/Scene Matching the aerocraft will save the land information of undersurface offly orbit in the memorizer which has been scouted in advance. While the aerocraft fly thescheduled position the sensor schlep will take the real time image like as RAR image. After thenthe real time image will match the reference image which has been stored beforehand and hasgeographic relation with real time image. Thus the position or horizontal and longitudinal distanceerror of the aerocraft can been fixed on. After that the navigation and control and guidance iscomplete.

在INS／景象匹配组合导航系统的导航过程中，飞行器首先将预定飞行轨道下面事先侦察到的一系列地面图像信息存到飞行器的存储器中，然后，当携带相应传感器的飞行器飞行到预定的位置时，便获取实时图，然后将实时图和预存的已知地理信息关系的基准图进行匹配比较，这样就可以确定出飞行器的当前位置或者偏离预定位置的纵向和横向偏差，从而完成导航和制导功能。

Just under this background, studying on the flight mechanism of flapping-wing MAV and sample fabrication from the bionics are conducted in this dissertation. The kinematics equations of insect wings can be acquired by the observation and measurement on the natural insect in researching paper. The geometry model of insect is established by UG technology. The three dimensional grid during the insect moving in the flow field is achieved which adopted grid generation method. The characteristic of lift and drag are attained by simulation the surround flow field during the locomotion of wings, and the flight mechanism of insect is discussed. Based on this study, the physical flapping-wing MAV is fabricated by the acquirable materials and parts of apparatus in existence.

正是在这一背景下，本文从仿生的角度来研究微型飞行器的飞行机理与样机制作；通过查阅文献中对自然界中昆虫翅膀运动的观察与测量，获取了昆虫翅膀的运动方程；采用UG建模技术，建立昆虫的几何模型；采用网格划分方法，获取昆虫在流场运动时的三维网格；运用CFD方法模拟翅膀运动时周围的流场，获取昆虫运动时的升阻力特性，进而来研究昆虫的飞行机理；在此基础上，通过现有可用的材料加工制作仿生微型飞行器。

Results:1.The rate of the pilots temporally grounded in the annual physical examination is 2.7%.

对1998～2007年在本疗区年度体检中鉴定为暂时飞行不合格的264名飞行人员疾病资料进行综合分析。

Yet in many ways Conrad's was the most interesting Apollo mission of all.

然而在许多方面，康拉德的飞行经历在&阿波罗&飞行团中是最有趣的。

And during their whole flight the Elder Tree smelt so sweet and odorous; he remarked the roses and the fresh beeches, but the Elder Tree had a more wondrous fragrance, for its flowers hung on the breast of the little maiden; and there, too, did he often lay his head during the flight.

在他们整个飞行的过程中，接骨木树一直在散发着甜蜜和芬芳的香气：他也闻到了玫瑰花和新鲜的山毛榉，可是接骨木树的香气比它们还要美妙，因为它的花朵就悬在这小女孩子的心上，而且当他们飞行的时候，他就常常把头靠着这些花朵。

Forget. And during their whole flight the Elder Tree smelt so sweet andodorous; he remarked the roses and the fresh beeches, but the Elder Tree had amore wondrous fragrance, for its flowers hung on the breast of the littlemaiden; and there, too, did he often lay his head during the flight.

在他们整个飞行的过程中，接骨木树一直在散发着甜蜜和芬芳的香气：他也闻到了玫瑰花和新鲜的山毛榉，可是接骨木树的香气比它们还要美妙，因为它的花朵就悬在这小女孩子的心上，而且当他们飞行的时候，他就常常把头靠着这些花朵。

The flying fortress has the fine altitude performance and the splendid anti- attack ability, often after suffered the huge fight wound still to be able to continue to fly, in the later period model, has equipped the formidable defensive weapon, all these caused it to win unit's trust and the affection, they believed B-17 could survives in the German armed force fighter aircraft and in the anti-aircraft gun belt of fire, leads their safe return to base.

飞行堡垒具有优良的高空性能与出色的抗打击能力，往往在遭受到巨大的战斗创伤后仍能继续飞行，在后期的型号中，更是装备了强大的防御系统，所有这些使它赢得了机组的信赖与喜爱，他们相信 B-17 能在德军战斗机和高射炮的火网中生存下来，带领他们安全返回基地。

Using entomological radar, we showed that the ability to select seasonally favorable, high-altitude winds is widespread in large day- and night-flying migrants and that insects adopt optimal flight headings that partially correct for crosswind drift, thus maximizing distances traveled.

根据所搜集到的雷达对天空中迁徙飞行的昆虫进行扫描的数据，Jason Chapman 及其同僚显示，在高空飞行的蛾子和蝴蝶能够选择有利的风向并纠正其方向的偏移，这些策略可使昆虫所覆盖的地面最大化，并使它们的飞行时间得到最佳化。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。