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结合主成分分析法(PCA)和正定矩阵因子分解法(PMF)的鄱阳湖丰水期表层沉积物重金属源解析
主成分分析 正定矩阵因子分解 鄱阳湖 沉积物 重金属 源解析 丰水期
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2020/9/24
为识别表层沉积物重金属的来源以及量化源贡献，选取鄱阳湖丰水期表层沉积物为研究对象，测定14种重金属（V、Cr、Co、Ni、Cu、Zn、Sr、Mo、Cd、Sb、W、Pb、Hg和As）的含量，分析其污染及空间分布特征，并利用主成分分析法（PCA）和正定矩阵因子分解法（PMF）对沉积物重金属进行源解析.结果表明：除V和Cr外，Cd、Mo、Hg、Cu、Pb、Zn、W、Sr、As、Ni、Co和Sb的平均含量...
基于PMF模型的长江流域水体中多环芳烃来源解析及生态风险评价
多环芳烃 长江流域 表层水体 生态风险
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2016/12/3
为研究长江流域水体中多环芳烃（PAHs）污染特征和生态风险，于2015年8月采集了长江干流及主要支流水体样品19个. 使用固相萃取方法提取PAHs，经净化后，利用气相色谱-质谱联用仪测定了16种优先控制PAHs（∑PAHs）的浓度. 结果表明，水体中∑PAHs浓度范围为17.7~110 ng·L-1，平均浓度为42.6 ng·L-1. 水体中PAHs主要以低环为主（2~3环），占水体∑PAHs总量...
Biomass burning impact on PM 2.5 over the southeastern US during 2007: integrating chemically speciated FRM filter measurements, MODIS fire counts and PMF analysis
the southeastern US FRM filter measurements MODIS fire counts PMF analysis
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2010/8/16
Archived Federal Reference Method (FRM) Teflon filters used by state regulatory agencies for measuring PM2.5 mass were acquired from 15 sites throughout the southeastern US and analyzed for water-solu...
Double-Pass PMF-based Optical Circuit Enhancing 40 Gbit/s Chromatic Dispersion Tolerance
Double-Pass PMF-based Optical Circuit Enhancing Chromatic Dispersion
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2015/8/4
Abstract A narrow-band Bragg filter with double-pass two-stage equalizer, realized using Polarization Maintaining Fibres, highly enhances the 40 Gbit/s tolerance to chromatic dispersion (≤27 km single...
PMD分析中的PMF级联模型研究
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2007/8/20
PMF级联模型是进行PMD研究广泛采用的模型.从PMD矢量在Stokes空间的运动入手,推导出了PMF级联模型的DGD的统计分布并给出了整体特性与局部特性之间的关系,所得结果用JME法验证是正确的.最后通过误差分析,提出了该模型的级联段数的选取原则.所得结论可为PMD的仿真提供理论依据.
Source Apportionment of Air Particulate Matter by Chemical Mass Balance (CMB) and Comparison with Positive Matrix Factorization (PMF) Model
Chemical mass balance (CMB) Source Apportionment Positive matrix factorization (PMF) PIXE PM10-2.2 PM2.2
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2016/3/30
The Chemical Mass Balance (CMB) model is one of several receptor models that have been
applied to air quality management. This model quantifies contributions using chemical signatures
characterizing...