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Light weathering theory,basic structures and characteristic of carbon arc lamp and xenon arc lamp acceleration weathering tester have been described.

塑料、涂料等高分子材料在使用的过程中经常出现起泡、变色、开裂和脱落等现象，严重影响产品的物理机械性能和表观质量。汽车外装部件诸如前后灯、格栅、保险杠、中央挡泥板和各种外部饰条等长期暴露在自然环境中，必然要求其具有较强的抗老化能力。

polymer material ; weathering ; carbon arc lamp ; xenon arc lamp

本文将对材料的老化机理进行简单阐述，对氙弧灯、碳弧灯

Based on test conditions of these two acceleration weathering methods in NES M1041,possibility is discussed on Xenon Arc Lamp Acceleration Weathering Test Substituting Sunshine Carbon Arc Lamp Acceleration Weathering Test in vehicle'acceleration weathering tests.

因此，在研制相应部品时，必须模拟自然使用条件对其进行老化测评。为了能快速评估材料的抗老化性能，在进行高分子材料的老化试验中，采用了人工加速老化的方法。目前人们常用的人工加速老化试验有氙弧灯、荧光紫外灯、金属灯和碳弧灯老化等。

Along with the unceasing development of technical innovation, the requirement for miner's lamp is more and more high, the lead sour miner's lamp of storage battery in coal mine enterprise gets extensive application.

随着科技创新的不断发展，对矿灯的要求越来越高，铅酸蓄电池矿灯在煤矿企业得到广泛应用。

"Inefficient in comparison with fluorescent lamp s and electric discharge lamp s, incandescent lighting is today reserved mainly for domestic use."

同萤光灯和放电灯相比，白炽灯的效率不高，现今主要还是家用电灯。

With the non-burning lamp core of the candle lamp, large amounts of cotton thread is saved.

与非燃烧灯的核心部分，蜡烛灯，大量的棉线是岸。

Lamp Current Crest Factor: Ratio of peak current to the root mean square lamp Current.

灯管电流峰值因数：峰值电流与灯管电流平方根的比值。。

Using this method, wide dimming range can be achieved with narrow frequency range and constant DC link voltage. And the lamp current keeps perfect sine wave all the time, which means low lamp current crest factor is obtained. Its validity is verified by simulation and experiment.

本章最后提出了一种基于T型滤波器的新型的调光方法，采用此方法可以在保持逆变器直流母线电压和开关占空比不变的情况下，只需很窄的频率范围就能达到非常宽的调光范围，而且在整个调光范围内灯电流都基本上是完美的正弦波，这就意味着可以始终保持很低的灯电流波峰因数，仿真和实验结果充分验证了它的优点。

R. Lamp Current Crest Factor: For 60Hz operation, the ratio of peak lamp current to the root mean square RMS

R。 为灯电流的最大峰值与均方根有效值之比。为避免操作阴极，标准规定LCCF 不得超过1.7 。

The solar-powered lighting system developed in this study possesses a few advantages, including energy conservation, high efficiency, a low lamp-current crest factor and a low starting lamp-voltage, which all conform to the general intention of green lighting.

本文所设计的太阳能萤光灯照明系统，具有节能、高效率、低灯管电流峰值因数及低启动电压的优点，能符合绿色照明之实用潮流。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。