The pollution characteristics of ambient fine particulate matter（PM2.5） containing polycyclic aromatic hydrocarbons（PAHs） and nitrated PAHs（NPAHs） in samples collected during a typical winter time period in Taiy...The pollution characteristics of ambient fine particulate matter（PM2.5） containing polycyclic aromatic hydrocarbons（PAHs） and nitrated PAHs（NPAHs） in samples collected during a typical winter time period in Taiyuan of China were investigated.The obtained results revealed that the mean mass concentrations of PM2.5,SPAHs（sum of 16 PAHs） and SNPAHs（sum of 3 NPAHs） on PM2.5were161.4 mg/m3,119.8 ng/m3and 0.446 ng/m3,respectively.Diagnostic ratios of PAHs and NPAHs implied that coal consumption might be the main source of the PM2.5pollution.The measured PM2.5mass concentrations,BaP equivalent toxicity（28.632 ng/m3） and individual carcinogenicity index（3.14 10 5） were much higher than those of the recommended safety standards.展开更多
The paper focuses on the properties of relative pronouns in the acquisition of relative clause by Chinese EFL learners. Based on the NPAH （noun phrase accessibility hierarchy）, comparison and contrast of some aspect...The paper focuses on the properties of relative pronouns in the acquisition of relative clause by Chinese EFL learners. Based on the NPAH （noun phrase accessibility hierarchy）, comparison and contrast of some aspects of English and Chinese relative pronoun, the paper conducts two experiments, and has proved the hypotheses that students＇ performance generally follows the hierarchy of NPAH and students do have problems with relative pronoun involving prepositions. Besides, some pedagogical implications for foreign language teaching are discussed.展开更多
Relativization is a common feature shared by almost every language,which also needs to be analyzed from the contrastive perspective.Considering about the NPAH theory,two questions has been solved here:what are the sim...Relativization is a common feature shared by almost every language,which also needs to be analyzed from the contrastive perspective.Considering about the NPAH theory,two questions has been solved here:what are the similarities and differences between English and Chinese selativization strategies;whether the data gained from analyzing the corpus could support the NPAH theory.By analyzing the corpus,2 points has been found:1)Relative-pronoun strategy is the most frequently used strategy in English,in spite of Chinese RC has no relative-pronoun strategy.2)The accessibility for English RC with+case strategy starts from IO,but Chinese starts from DO.Generally,both English and Chinese relative clause can support the accessibility hierarchy of the NPAH.展开更多
Nitrated polycyclic aromatic hydrocarbons(NPAHs)are widespread organic pollutants that possess carcinogenic and mutagenic properties,so they may pose a risk to the environment and human health.In this study,the concen...Nitrated polycyclic aromatic hydrocarbons(NPAHs)are widespread organic pollutants that possess carcinogenic and mutagenic properties,so they may pose a risk to the environment and human health.In this study,the concentrations of 15 NPAHs and 16 polycyclic aromatic hydrocarbons(PAHs)in 30 surface water samples and 26 sediment samples were measured in 2018 from the Taige Canal,one of the main rivers flowing into Taihu Lake,China.The total NPAH concentrations in water and sediment ranged from 14.7 to 235 ng/L and 22.9 to 96.5 ng/g dw,respectively.9-nitrophenanthrene(nd–76.3 ng/L)was the dominant compound in surface water,while 2+3-nitrofluoranthene(1.73–18.1 ng/g dw)dominated in sediment.Among PAHs,concentration ranging from 1,097 to 2,981 ng/L and 1,089 to 4,489 ng/g dw in surface water and sediment,respectively.There was a strong positive correlation between the log octanol-water partition coefficient(Kow)and log sediment-water partition coefficient due to hydrophobic interaction.The fugacity fraction value increased with the decrease of log Kow,and chrysene was transferred from water into sediment.The residual NPAHs in surface water and sediment of the Taige Canal have partial correlation.Diesel engine and coal combustion emissions were probably the principal sources of NPAHs in surface water and sediment.The results of ecological risk assessment showed that some NPAHs inwater(e.g,1-nitropyrene and 6-nitrochrysene)and sediment(e.g.,2-nitrobiphenyl,5-nitroacenaphthene,9-nitrophenanthrene and 2+3-nitrofluoranthene)had moderate ecological risks,which should be of concern.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21177078, 21175086, 21175025 and 41271531)Supported by Shanxi Scholarship Council of China (No. 2013-16)100 talents program of Shanxi Province
文摘The pollution characteristics of ambient fine particulate matter（PM2.5） containing polycyclic aromatic hydrocarbons（PAHs） and nitrated PAHs（NPAHs） in samples collected during a typical winter time period in Taiyuan of China were investigated.The obtained results revealed that the mean mass concentrations of PM2.5,SPAHs（sum of 16 PAHs） and SNPAHs（sum of 3 NPAHs） on PM2.5were161.4 mg/m3,119.8 ng/m3and 0.446 ng/m3,respectively.Diagnostic ratios of PAHs and NPAHs implied that coal consumption might be the main source of the PM2.5pollution.The measured PM2.5mass concentrations,BaP equivalent toxicity（28.632 ng/m3） and individual carcinogenicity index（3.14 10 5） were much higher than those of the recommended safety standards.
文摘The paper focuses on the properties of relative pronouns in the acquisition of relative clause by Chinese EFL learners. Based on the NPAH （noun phrase accessibility hierarchy）, comparison and contrast of some aspects of English and Chinese relative pronoun, the paper conducts two experiments, and has proved the hypotheses that students＇ performance generally follows the hierarchy of NPAH and students do have problems with relative pronoun involving prepositions. Besides, some pedagogical implications for foreign language teaching are discussed.
文摘Relativization is a common feature shared by almost every language,which also needs to be analyzed from the contrastive perspective.Considering about the NPAH theory,two questions has been solved here:what are the similarities and differences between English and Chinese selativization strategies;whether the data gained from analyzing the corpus could support the NPAH theory.By analyzing the corpus,2 points has been found:1)Relative-pronoun strategy is the most frequently used strategy in English,in spite of Chinese RC has no relative-pronoun strategy.2)The accessibility for English RC with+case strategy starts from IO,but Chinese starts from DO.Generally,both English and Chinese relative clause can support the accessibility hierarchy of the NPAH.
基金supported by the National Natural Science Foundation of China (No. 41671493)the Natural Science Foundation of Jiangsu Province (No. BK20191372)the National Major Project of the Science and Technology Ministry of China (No. 2017ZX07202-004)
文摘Nitrated polycyclic aromatic hydrocarbons(NPAHs)are widespread organic pollutants that possess carcinogenic and mutagenic properties,so they may pose a risk to the environment and human health.In this study,the concentrations of 15 NPAHs and 16 polycyclic aromatic hydrocarbons(PAHs)in 30 surface water samples and 26 sediment samples were measured in 2018 from the Taige Canal,one of the main rivers flowing into Taihu Lake,China.The total NPAH concentrations in water and sediment ranged from 14.7 to 235 ng/L and 22.9 to 96.5 ng/g dw,respectively.9-nitrophenanthrene(nd–76.3 ng/L)was the dominant compound in surface water,while 2+3-nitrofluoranthene(1.73–18.1 ng/g dw)dominated in sediment.Among PAHs,concentration ranging from 1,097 to 2,981 ng/L and 1,089 to 4,489 ng/g dw in surface water and sediment,respectively.There was a strong positive correlation between the log octanol-water partition coefficient(Kow)and log sediment-water partition coefficient due to hydrophobic interaction.The fugacity fraction value increased with the decrease of log Kow,and chrysene was transferred from water into sediment.The residual NPAHs in surface water and sediment of the Taige Canal have partial correlation.Diesel engine and coal combustion emissions were probably the principal sources of NPAHs in surface water and sediment.The results of ecological risk assessment showed that some NPAHs inwater(e.g,1-nitropyrene and 6-nitrochrysene)and sediment(e.g.,2-nitrobiphenyl,5-nitroacenaphthene,9-nitrophenanthrene and 2+3-nitrofluoranthene)had moderate ecological risks,which should be of concern.
