spectral concentration

Spectral Analysis on Hydrocarbon Concentration in Soil of Liaohe River Delta

辽河三角洲土壤中石油类含量光谱分析初探

Spectral properties in glassy tetraphosphate with high neodymium ( Nd~ ( 3+)) concentration

高钕浓度的玻璃态四磷酸盐的光谱特性

Applying the power spectral analysis, the laws of 2.2-year-periodicity can be found. With the method of the degree and time of concentration, we found that hails and cold disasters have a high frequency in spring and floods, droughts and typhoons often happen in summer.

对地震、水灾等6种灾害的功率谱、集中度和集中期分析显示，南通市自然灾害具有2.2年的年际变化规律和春季多冰雹、寒害，夏季多旱涝、台风的年内分布规律；

Rapid concentration and determination of paucity gold by spectral analysis using copper tube masked electrode

加罩铜管电极光谱法对微量金的快速富集和测定初探