The relation between the gain of Raman amplifier and pump power at different effective interaction length of optical fiber is anlyzed.
研究了在不同的光纤有效作用长度时，拉曼放大器增益与抽运功率的关系；
The pile stiffness is reduced by the pile-pile interaction and the effective length of piles becomes longer.
桩桩相互作用降低了桩的刚度，并使群桩的有效桩长加大了。
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