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The factors such as conjugate framework withsmall conjugation energy, central asymmetry, long conjugate chain,introduction of electron donors-acceptors, strong electron-donating orelectron-withdrawing abilities, long distance between electron donors andelectron acceptors, good coplanarity and so on lead to high third-order optical nonlinearities.

离域能小的共轭骨架,非中心对称结构,长的共轭链,吸供取代基的引入,取代基强的供电子性或吸电子性,长的吸供电子取代基之间的距离,以及良好的共平面程度等因素有利于获得较大的三阶非线性光学性能。

A strip block is used instead of the ball to eliminate the measurement error caused by the trajectory deviation of the ball when passing the photo gate.And a spring clip is used to replace the electromagnet to eliminate the effect of remanence.

在单摆法中,要求忽视细线的质量且线长及小球尺度相比很大,把小球看成质点,并且小球的摆幅不能超过5°[1~3];在自由落体法中,一般是用小球作为自由落体,但小球通过光电门时,往往不是小球的质心遮光计时,另外,钢球是用电磁铁通电后吸住的,由于断电的瞬间,电磁铁有剩磁,钢球不立即下落,并且钢球应吸在电磁铁的中心处,这些因素都会影响重力加速度的测量。

推荐网络例句

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。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力