查询词典 up in the air

The thesis can be divided into five parts as follows: First, the structural characteristics of finned-pipe evaporator are analyzed. After selecting suitable microelement controller, the heat-transfer and mass-transfer processes are analyzed for every microelement under the conditions of dryness, wetness and frostiness. Based on previous equations, some parameters of frostiness are confirmed and the frost-growing model is set up under frost condition. Some hypotheses are postulated and with the help of the equation of mass-conservation, energy-conservation and momentum-conservation, the evaporation model which fits in the dynamic simulation is built, which set a solid foundation for system simulation. Second, the starting and stopping behaviors under disturbed condition are analyzed and calculated by using the dynamic concentrative parameter model, which gives some advice to better prescribe refrigeration system and set theoretic foundation for carrying out automatic control of refrigeration system. Third, the normal running process is analyzed and calculated by means of rational matching theory, which gives some advice on how to better understand the parameter change under steady state and the affection of inlet-parameter on evaporator. Fourth, the simulation software with dynamic characteristic is designed, which can be applied to calculate thernio-parameter of cryogen, air humidity and frost thickness under different initial and boundary conditions, and to carry out dynamic simulation under conditions of dryness, wetness and frostiness, at the same time, to achieve detection and simulation at any stage from starting to stopping.

本文的主要内容如下：1对翅片管蒸发器结构特点进行分析，选取适当的微元控制体，就干、湿和霜工况下对每个微元分别进行传热传质分析，基于经验关系式确定霜的有关参数，对于霜工况下的霜生长建立模型，经适当假设，运用质量守恒、能量守恒和动量守恒方程建立适合动态仿真的蒸发器数学模型，为系统仿真奠定基础； 2对蒸发在大扰动下的开、停机过程，运用动态集中参数模型进行分析和计算，为更好地描述制冷系统运行的全过程奠定基础，同时也为制冷系统实现自动控制提供一定的理论基础； 3对蒸发器正常运行过程，运用动态分布参数和参数间定量耦合的观点来分析和计算，为更好地了解稳态工况下各点参数的变化情况及各入口参数对蒸发器动态特性的影响即蒸发器性能对各参数变化的敏感性； 4编写翅片管蒸发器动态特性仿真计算程序，可以计算不同边界条件和初始条件下的制冷剂热力参数、空气温湿度和霜厚度分布场，实现对翅片管蒸发器在干、湿和霜工况下的动态仿真。

The high cylinder pressure from the power stroke is relieved once the exhaust port is opened, but when it closes off as the piston travels up, the remaining air in the cyclinder is compressed - robbing energy.

高气缸压力的电力缓解中风后，排气口被打开，但是当它关闭的关闭活塞旅行了，剩下的空气压缩cyclinder -抢劫能源。

Pull up a Deck Chair and dip your feet in the Paddling Pool, or have a yarn around the BBQ while the waft of sausages fills the air.

打开帆布椅子，把你的双脚浸在嬉水池，或是围在烧烤炉慢慢品尝弥漫在空中的香肠飘香味。

"When you see the enthusiasm, the idealism and the faith in a better future and then when you look at the perception abroad -- that it's propping up a regime, air pollution, child-athlete factories -- there is a disjuncture," Ms. Brownell says.

布朗奈尔说："当你看到中国人对未来抱有更高的热情、理想和信心，然后看到国外的观念：认为中国是在维持自己的统治，只看到这里的空气污染、从小就培养运动员的机械体制──这就是认识的脱节。"

In the experiment,the electrobath was made up of iron-anode and gas diffusion electrode as cathode,meanwhile the air blowed the cathode.

实验以自制气体扩散电极为阴极，铁板为阳极，并向阴极不断通入空气。

According to the requirements of the glass furnace, this system is proposed to use computer and PLC build up into one new control technique. Using this system, the technical requirements of varying of Petroleum, Pulverized Air and Exhaust Fume in the operation are guaranteed effectively. The system has overcome the disadvantage of the traditional control system.

本文针对玻璃熔窑运行过程中的要求，采用计算机控制技术与PLC组合成一新型的控制系统，快速准确地实现生产过程的控制，有效的保证了运行过程中重油、雾化气、助燃风及废气闸板的换向要求，以实现火焰换向的自动化控制。

Their number follows ,such as partridges,have a like power of strong propulsion,but sooner tire.you may pick them up in utter exhaustion,if wind over the sea drive them to a long distance.the swallows share the virtues of both schools,it tires not ,nore does it boast of its power.it belong to the air.travelling it may be six thousand miles to and from the northern nesting home.

如果海风驱使它们飞行很长距离，你可以捡到一些因筋疲力尽而摔下来的鹧鸪。燕子充分兼有这两类鸟的长处，它既不疲劳，也不炫耀自己的飞翔力；在空中十分自如，可以飞行6，000英里，可以飞往北方做窝的老家，再从老家飞回；一边飞一边喂养会飞的雏燕，甚至在顶风时也能在气流中滑翔，似乎气流在帮它前进。

For saving the fuel and increasing the efficiency of gas turbine cycle, recuperator is used to warm-up the air entering the combustion of gas turbine by absorbing the heat of exhaust in recuperation cycle.

在回热循环中，回热器利用燃机排气中的余热(一般温度为600℃左右)来预热进入燃气轮机燃烧室的气体，从而达到节省燃料、提高燃机效率的目的。

It is embodied concretely:(1) With the adoption of grouting bolts, the cranny in wall rocks can be blocked up, the air can be isolated, the wall rocks can be prevented to be weatherized and make water, the strength of wall rocks can also be avoided to be lowered;(2) The lax broken wall rocks are commentated to a whole by liquid after they were grouted and the rock"s strength is increased, so the wall rocks become a part of the support structure by using itself and become a whole with the original rock, and the roadway is made to keep stable but not easy to be broken;(3) The spray layer wall are filled with liquid after grouting, the stress is avoided to be concentrated because the load could be evenly acted on the spray layer and the support;(4) The pressure acted on the plank can be delivered to the two sidepieces and then to the bottom by reinforcing the sidepiece; At the same time, the concentration degree of loads acted on the motherboard can be weaken because of the enlargement of the combination arch"s thickness, as result, the rock"s stress is lowered and the heaving is alleviated;(5) The common bolt is made to be fixed the whole length after grouting, the layers are connected to a integral whole and bear the weight of loads, so the support structure"s unity is increased.

具体体现在：(1)采用注浆锚杆注浆，可以利用浆液封堵围岩裂隙，隔绝空气，防止围岩风化，且能防止淋水和渗水，避免围岩被水浸湿而降低围岩的本身强度及造成的巷道变形。(2)注浆后浆液将松散破碎的围岩胶结成整体，提高了岩体强度，实现利用围岩本身作为支护结构的一部分，且与原岩形成一个整体，使巷道保持稳定而不易产生破坏；(3)注浆后使得喷层壁后充填密实，保证荷载能均匀地作用在喷层和支护上，避免出现应力集中点而首先破坏；(4)注浆后使作用在顶板上的压力能有效地传递到两帮，通过对帮的加固，又能把荷载传递到底板；同时由于组合拱厚度的加大，这样又能减小作用在底板上的荷载集中度，从而减小底板岩石中的应力，减轻底臌；(5)注浆加固后能使普通端锚锚杆实现全长锚固，它们共同将多层组合拱连成一体，共同承载，提高了支护结构的整体性。

The heavier air in the downcast shaft descends the mine, and after passing around the mine and up the upcast shaft ultimately arrives at the fan to be discharged into the atmosphere.

较重的空气在downcast轴降地雷，并合格后，周围的地雷和加快upcast轴，最终抵达在樊被排放到大气中。

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。