Frost(1972, 1975)根据功能反应曲线提 出摄食阈值浓度(threshold concentration), 即浮游桡 足类的摄食率为零时(停止摄食)的饵料浓度。
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激光掺杂存在一个阈值能量密度。掺杂浓度和深度的分布与预热温度和杂质镀层厚度有关。
It is found that there is a threshold energy density in laser doping, and distributions of dopant density and depth have relation to preheat temperature and plating layer thickness of the impurities.
结果表明，高浓度EDTA对KDP晶体光散射有明显的影响，但对光学均匀性和光损伤阈值无明显影响。
The result showed that EDTA with high concentration has evident effect on light scatter of KDP crystal but not laser damage threshold and homogeneity.
阈值法的准确与否直接影响煤泥水浓度的计算精度。
The precision of threshold value directly affect the calculate precision of slime water.
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