机车

The principle of the novel single-phase hybrid active power filter is described in detail. Based on the above analysis, Kalman filtering approach for estimation of harmonics is presented to improve the speed and precision of harmonic detection, and it also can avoid the influence made by voltage distortion on harmonic detection. A new current control strategy based on energy balance is presented to regulate the active part absorbing or releasing active power and control the inverter to produce current opposite to the harmonic current reflowing in injection branch, the above method combined with harmonic current tracking control that keeps the stabilization of dc-side voltage and improve the reliability of the system.

并详细分析了系统的滤波原理，提出了基于卡尔曼增益自调整的改进型动态谐波含量估计方法，能够快速准确的跟踪检测电网谐波电流，并且克服了电力机车等冲击性负荷引起的电网电压畸变对谐波检测精度的影响；提出了基于逆变器两侧能量平衡的电流控制方法使有源部分吸收或释放一定有功或无功功率及产生与注入支路回灌谐波电流相反的抑制电流，然后联合电网谐波电流跟踪控制以获得系统参考信号，保证了直流侧电压的稳定，提高了装置可靠性，增强了系统滤波性能。

The cooling performance of both types of radiators was analyzed and the results were acquired.

随着机车向高速大功率方向的发展，冷却技术的改进显得非常重要。

And the engine is crowded with the queerest lot of people!

司机说。机车上满是奇奇怪怪的人！

Comparatively, the effect of cage is more than that of pit prop.

相比较而言，罐笼对电磁波截止频率影响最大，支护立柱影响最小，机车对电磁波影响的范围最大。

Using finite-element method the effects of long objects, such as cage, train and metal pit prop, on electromagnetic wave cutoff frequency is researched systematically in regular tunnels, and it is shown that the long metal objects lower TE wave cutoff frequency and raise TM wave cutoff frequency.

利用有限元方法系统地研究了机车、罐笼、金属支护立柱等长列金属物体对井下规则隧道中电磁波截止频率的影响，可知长列金属物体的存在使TE波模截止频率降低，而使TM波模截止频率升高。

Pass splendid specimens of Anglo Norman architecture, pass pedestrians and pederasts, open hearth furnaces, basic Bessemer mills, dynamos and transformers, pig iron castings and steel ingots.

机车经过盎格鲁-诺曼式建筑的堂皇标本，经过了步行者和男同性恋者、天冶炼炉、用贝塞麦法的磨坊、电机和变压器、铁块和钢锭。

Pass splendid specimens of Anglo Norman architecture, pass pedestrians and pederasts, open hearth furnaces, basic Bessemer mills, dynamos and transformers, pig iron castings and steel ingots.

机车经过盎格鲁-诺曼式建筑的堂皇标本，经过了步行者和男同性恋者、露天冶炼炉、使用贝塞麦法的磨坊、发电机和变压器、生铁块和钢锭。

Pass splendid specimens of AngloNorman architecture, pass pedestrians and pederasts, open hearth furnaces, basic Bessemer mills, dynamos and transformers, pig iron castings and steel ingots.

机车经过盎格鲁-诺曼式建筑的堂皇标本，经过了步行者和男同性恋者、露天冶炼炉、使用贝塞麦法的磨坊、发电机和变压器、生铁块和钢锭。

Using the Acela as an example, this has two parts to both pantos

用Acela机车做个例子，这有两部分

The engine is letting off steam to relieve the pressure in the boiler.

机车在放蒸汽，以减少锅炉的气压。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。