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| 1 | Comparison of Two Air Pollution Episodes over Northeast China in Winter 2016/17 Using Ground-Based Lidar显示文摘This study analyzes and compares aerosol properties and meteorological conditions during two air pollution episodes in 19–22(E1) and 25–26(E2) December 2016 in Northeast China. The visibility, particulate matter(PM) mass concentration, and surface meteorological observations were examined, together with the planetary boundary layer(PBL) properties and vertical profiles of aerosol extinction coefficient and volume depolarization ratio that were measured by a ground-based lidar in Shenyang of Liaoning Province, China during December 2016–January 2017.Results suggest that the low PBL height led to poor pollution dilution in E1, while the high PBL accompanied by low visibility in E2 might have been due to cross-regional and vertical air transmission. The PM mass concentration decreased as the PBL height increased in E1 while these two variables were positively correlated in E2. The enhanced winds in E2 diffused the pollutants and contributed largely to the aerosol transport. Strong temperature inversion in E1 resulted in increased PM2.5 and PM10 concentrations, and the winds in E2 favoured the southwesterly transport of aerosols from the North China Plain into the region surrounding Shenyang. The large extinction coefficient was partially attributed to the local pollution under the low PBL with high ground-surface PM mass concentrations in E1,whereas the cross-regional transport of aerosols within a high PBL and the low PM mass concentration near the ground in E2 were associated with severe aerosol extinction at high altitudes. These results may facilitate better understanding of the vertical distribution of aerosol properties during winter pollution events in Northeast China. | Yanjun MA Hujia ZHAO Yunsheng DONG Huizheng CHE Xiaoxiao LI Ye HONG Xiaolan LI Hongbin YANG Yuche LIU Yangfeng WANG Ningwei LIU Cuiyan SUN | 2018 | Journal of Meteorological Research2018，32，2： | 5 |
| 2 | On Cultural Barrier Problems in English Writing显示文摘As the cross-cultural communication activities have become increasingly frequent,teaching of writing,one of cross-cultural communication activities,sets“developing students’cross-cultural awareness”as one of its goals.However,traditional language teaching,which focuses on linguistic knowledge rather than cultural knowledge,results in the cultural barrier problems among students.This paper analyzes the manifestation of cultural barriers from the aspect of language and puts forward some corresponding approaches and methods. | Che Ningwei | 2023 | Sino-US English Teaching2023，20，2： | 0 |
| 3 | Constraints on Transfer Errors显示文摘As the understanding of first language transfer goes forward,the error resulted from first language is widely considered as an unavoidable phenomenon in second language learning.This paper is to analyze some major constraints on first language transfer,including markedness,learners’language proficiency level,psychotypology,and formal instruction.The purpose is to seek solutions to reduce first language transfer errors. | CHE Ningwei | 2019 | US-China Foreign Language2019，17，10： | 0 |
| 4 | On the Choice of Reading Materials in TESL显示文摘The choice of reading materials partly decides the effectiveness of classroom reading instructions in TESL.This paper analyses the cognitive process of reading and some problems in classroom reading instructions of reading course,and suggests three basic principles for choosing reading materials,including the principle of comprehensibility reading materials,readers’familiarity with the topics of the reading materials,and the sufficiency of reading materials. | CHE Ningwei | 2019 | Sino-US English Teaching2019，16，10： | 0 |
| 5 | Understanding the Principle of Arbitrariness From the Perspective of Saussure’s Theory Linguistics显示文摘Arbitrariness,one of the basic principles of language,is the basis of Saussure’s theory of general linguistics.Comprehension of arbitrariness largely helps to have a better understanding of the design features of language,such as convention,variability and invariability,creativity of language,and language value.This paper explores the relationship between arbitrariness and these design features,aiming to shed light on the nature of language. | Che Ningwei | 2023 | US-China Foreign Language2023，21，3： | 0 |
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