递减 (一次比一次减少) decrease progressively [successively]; decrease by degrees; reduce progressively 预算递减 a decrease of budget; 茶叶的需求量(逐年) 递减。 the demand for tea is on the decrease (each year). 这个城市的人口在逐年递减。 there has been a progressive decrease in population every year in this city.; 递减成本[费用] degressive cost; 递减次序 descending order; 递减充电 tapered charge; 递减函数 decreasing function; 递减计数(法) countdown; 递减价值定率折旧法 fixed percentage of diminishing value method; 递减累进税 degressive tax; regressive tax; 递减率 [气象学] gradient; lapse rate; 递减律 reduced law; 递减曲线 decreasing curve; 递减序列 descending series; 递减线 [气象学] lapse line; 递减压力 decreasing pressure; 递减次序 descending order
Three shaped profiles ( parabola , linear , and exponential ) have been considered . the exponential dispersion profile fiber loop is optimal for the propagation and compression of picosecond pulse . on the contrary , the parabola dispersion profile fiber loop is optimal for femtosecond pulse due to the high order effects such as the third order dispersion ( tod ) , stimulated raman scattering ( srs ) and self steeping ( ss ) ( 3 )研究不同色散递减类型(抛物线递减、线性递减、指数递减)光纤构成的环形腔中传输的特性,发现其色散曲线为指数递减型光纤有利于皮秒光脉冲的传输与压缩;而对于飞秒脉冲,由于三阶色散( tod ) 、脉冲拉曼自散射( srs )及自变陡( ss )等高阶非线性效应的影响,情况恰恰相反;色散曲线为抛物线递减型的光纤构成的光纤环最有利于脉冲传输与压缩。