动力下降

气体燃料发动机具有较好的排放性能和经济性能，气体燃料发动机动力下降的主要原因是单位体积的混合气热值较低。

The main reason of lower-power of gaseous fuel engine is the lower calorific value per unit volume .

仿真结果也验证了动力下降段的制导、导航与控制系统的设计的合理性。最后，进行了终端着陆段的制导、导航与控制系统设计。

The design is also verified by numerical simulations . Finally , the GNC system for the terminal descent phase is proposed .

因此，为保证在动力下降过程中轨控发动机的燃料最优推力方向，设计了姿态跟踪控制律。

Hence , to ensure the right thruster direction in the powered descending phase , the attitude tracking control law is designed and the simulation proves its validity .

据对路内电力机车运用情况的调研资料表明，多数电力机车存在有可控硅动态击穿现象。而机车一旦出现该现象，轻则要将所烧损的整流柜甩掉，造成机车牵引动力下降；

Many data of electric locomotive using shows that most electric locomotive exist the problem of SCR dynamic damage , which can be seen as a result of over-high voltage between SCR .

如果没有进入缸壁，不管你如何猛踩油门发动机的速度都不会很快了（动力下降）。

If this happens before the entire ring has worn into the cylinder and sealed , you will have a slow engine no matter how hard it gets ridden after that point .

糖尿病胃运动功能障碍是糖尿病常见的一种慢性并发症，10年以上患者胃神经肌肉功能异常发生率高达30~50%，其主要特点是胃动力下降、排空迟缓，从而导致胃潴留。

Gastric motility abnormity is frequently encountered in patients with long-standing diabetes , it occurs in up to 30 – 50 % of patients after 10 years of type 1 or type 2 diabetes .

但是，近年来，受上游产业原料供应与下游产品市场需求之间缺口不断扩大的影响，广东省木材加工业呈现出发展动力下降、竞争能力变弱的趋向。

However , in recent years , the wood processing industry has taken on the tendency of declining development power and weakened competitive capacity because of the expanding gap between the supply of the raw material and the demand of the products .

燃用LPG的发动机的一个主要缺点是动力性下降。

The loss of power is the main disadvantage of a LPG engine .

汽油/CNG两用燃料发动机改装方便、成本低，是我国CNG汽车中应用最为广泛的，但同时也普遍存在着改装后动力性下降的问题。

In china , the Gasoline / CNG bi-fuel engines cost low and refits easily , are the most widely used in CNG vehicles .

之后又用所编程序对汽油机改装成CNG发动机后的性能做了拓展性研究，并就如何解决因燃用天然气导致的动力性下降等问题做了模拟研究。

Secondly , this paper conducts an expansive performance research on a CNG engine which is modified by gasoline engine , and studies how to solve the problems such as the performance decline while burning CNG in the engine .

结果表明，液态LPG缸内直接喷射发动机的最大扭矩较燃用汽油时提高约10%，能有效解决LPG常规供应方式发动机动力性下降的问题，具有良好的发展前景。

The results show with the direct liquid jet in the cylinder , the maximum torque of LPG engine is 10 % more than that of gasoline engine . The technology can solve the problem of the tail gas pollution of motorcycle , and have bright future .

天然气汽车（NGV）是由汽油车改装的天然气/汽油双燃料汽车，由于采用缸外预混合供气方式，导致发动机功率损失和动力性能下降，这是NGV推广应用中的技术难题。

Owing to adopting the out-cylinder premixed gas-filling method for natural gas vehicle ( NGV ), the power loss and dynamic property decrease of the engine have prevented its popularization and application .

将汽油缸内直接喷射技术（GDI）用于LPG发动机，以根本解决其动力性下降的缺点，并进一步提高燃料经济性和排放水平，满足现代车用发动机的要求。

In order to solve the problem of power losses and to improve the fuel economy & the emission level , the research purpose of this paper is using GDI technology on LPG-fueled engines ; and the engines can satisfy the demand of modem vehicles .

本文分析了NGV动力性下降的原因，认为除了采用提高发动机压缩比（ε）和可变ε技术外还可以采用增加天然气中重烃含量来提高NGV动力性。

On the basis of analysis for the reason of power drop of NGV , it believes that is is possible to improve the power of NGV by increasing the heavy hydrocarbon content of natural gas besides raising engine compression ratio (ε) and using variable ε technique .

一旦你开始松懈，他们的满意和动力就会下降。

As soon as you start to slack off , their satisfaction and motivation decreases .

分析了汽油/天然气两用燃料发动机在天然气工况出现动力性能下降的原因；

The reasons of the power performances reduction for gasoline / natural gas engine have been analyzed when natural gas is used .

发动机密封性降低，会造成发动机经济性、动力性下降及废气排放指标恶化，因此对各缸压缩压力的检测具有重要意义。

The lowering hermetical state of an engine will not only cause economy and power coastdown , but also worsen the emission evaluating indicators of exhaust gas .

天然气汽车发动机由于采用缸外预混合的燃料供给方式，导致动力性能下降，这是天然气汽车推广应用中的技术难题。

NGV engine adopts the fuel supply method of premixing natural gas and air in the premixing chamber out of cylinder , which results in the engine dynamic performances decline .

近年来的研究发现固液界面的滑移可以减小表面摩擦，但也会造成流体动力效应下降甚至消失。

During recent years it was found that slippage on a solid-liquid interface could give rise to a considerable friction drag reduction , but it could also cause a dramatic reduction of the hydrodynamic response .

结果发现，CO和碳烟排放均大幅下降，而NOx排放不发生显著变化，低转速工况下掺加15%对HC排放有所下降，而高转速情况下则有所上升，动力性有所下降，油耗增大。

The result indicated that the CO and smoke emission descended tremendously , the NO_x emission had no remarkable change . The HC emission declined under low speed and ascended under high speed when adding 15 % 2-ethoxyethyl acetate with power output decreasing and fuel consume increasing .

一旦房屋成为负资产，借贷者继续偿付贷款的动力将有所下降。

Once a home tips into negative equity , borrowers have less incentive to keep up on repayments .

每种比例的甲醇汽油燃料在燃用的过程中随着油门的加大，发动机的动力性呈下降趋势，但下降幅度很小。

Each percentage of methanol-gasoline blends in the burning process , with the increasing opening of throttle , engine power has a downward trend , but the decline is very small .

水体与塔楼耦合作用对升船机上部机房的动力影响已经下降的水位因为河的部分分流又上升到触手可及的位置。

Dynamic Effect on Upper Part of Tower Engine Room for Ship Lift Caused by Water Coupling with Tower Receding water levels on some of the river 's branches have begun to rise again because of heavy falls in the upper reaches .

气动力对伞稳定下降阶段摆动的影响

Influence of Aerodynamic Force on a Parachute 's Oscillation in Steady Descent

但是这次增长的动力是价格的下降。

But fueling that increase was a drop in prices .

本文简要介绍了自然循环热水锅炉简单循环网路、并联回路的水动力计算方法和下降管入口水温的计算。

An algorithm for hydrodynamic calculation of a simple or a parallel natural circulation in a heat-water boiler and for calculation of the temperature at the inlet of a downcomer is introduced briefly in this paper .

发动机的密封性能差会引起漏水、漏油和漏气现象，不仅会引起发动机动力损失、功率下降、使用寿命降低，还会导致污染环境、能源浪费。

The engine sealing performance is poor will cause to leak water 、 oil and gas , which not only can cause loss of engine power , service life reduced , but also cause pollution , energy waste .

在欧佩克做出不减产决定之前，油价下跌似乎就已经开始冲击美国混合动力车市场。11月美国混合动力车销量同比下降11%。

Even before Opec 's move , lower oil prices appeared to be hitting hybrid cars in the US , where sales were down 11 per cent in November compared with the same month last year .

应用于混合动力电动汽车的铅酸蓄电池，由于其性能参数的不一致性而导致使用过程中产生性能参数差别的扩大化，是造成蓄电池使用寿命短以及混合动力电动汽车性能下降的重要因素。

The inconsistent of performance parameter of Lead acid battery for HEV causes the differences spreading in use , which are the main factors to shorter operation life and decreasing in performance .