This is a research report on the interrelationship among understanding, memory and oral expression in listening comprehension training. The research investigated 150 non-English majors through a questionnaire in a hig...This is a research report on the interrelationship among understanding, memory and oral expression in listening comprehension training. The research investigated 150 non-English majors through a questionnaire in a higher vocational college. The result indicates that the interrelationship among understanding, memory and oral expression in listening classes which are determined by the listening materials and teaching method directly influences students' listening proficiency and speaking ability. It is suggested that some strategies to be used to foster students' abilities in these three areas so as to improve their listening ability.展开更多
In recent years, most of domestic and foreign researches about heavy metal pollutions of metal mine mainly focus on water, soil and plants on the surface. There is lack of researches about heavy metal pollution in gro...In recent years, most of domestic and foreign researches about heavy metal pollutions of metal mine mainly focus on water, soil and plants on the surface. There is lack of researches about heavy metal pollution in groundwater of metal mine. In this research, a certain antimony mine area is selected as a typical study area. Also, the study about statistical characteristics of heavy metals in groundwater has been carried out. Furthermore, the interrelationships have been preliminarily discussed through related analysis, such as relevant analysis, cluster analysis and principle component analysis. The results show that: the excessive elements in groundwater of study area are Sb, As, Pb, Se, and Ni. The average mass concentration of Sb, As, and Pb is higher than that of drinking water standards(GB5749-2006). The concentration of most heavy metals in dry season is lower than or equal to that in wet season for groundwater. Zn is the only metal in groundwater showing a different pattern, the concentration of which in dry season is higher than that in wet season. Under the impacts of stratum leaching and absorption effect, the concentration of heavy metals(except Pb and Ba) in groundwater are lower than or equal to that in surface water. As and Se, the two heavy metals have a significant positive correlation, which shows the two elements might have gone through similar environmental geochemical effect. Also, the connection among Zn, Hg, Pb, and Mn is not obvious; therefore, the sources of those elements are quite different. In addition, the elements of Se and As have obvious positive interrelationship with elements of CO_3^(2-) and F^-. Also, the Pb has significant positive correlation with PO_4^(3-), H_2SiO_3 and oxygen consumption. The results of cluster analysis show that 9 different heavy metals in the study area can be divided into 3 categories: Zn, Cd, Mn, Hg, Cu, and Cr belong to the first category, Se and As belong to the second one, and the last category is Pb. Also, the principle component analysis divides 6 heavy metals(Zn, As, Hg, Pb, Mn, and Se) into 4 different principle components, which can be utilized to assess heavy metals pollution situations in groundwater. The reliability of this method is higher than 91%. Moreover, the research provides theory basis and models for establishing evaluation index system and exploring the evaluation method of heavy mental pollution in groundwater.展开更多
The authors designed a specific primer of EB virus Bam W fragment and EBV DNA sequence by using the polymerase chain reaction（PCR） to amplify the EBV DNA sequences and the performing the hybridization analysis（dolb...The authors designed a specific primer of EB virus Bam W fragment and EBV DNA sequence by using the polymerase chain reaction（PCR） to amplify the EBV DNA sequences and the performing the hybridization analysis（dolblot and Southern transfer） with a γP labelled internal olignoucleotide probe.展开更多
This article discusses the importance of theory and paradigm to a researcher. It starts from introducing and analyzing thedefinition of the two terms, by using the theories in the field of intercultural communication ...This article discusses the importance of theory and paradigm to a researcher. It starts from introducing and analyzing thedefinition of the two terms, by using the theories in the field of intercultural communication as examples. To a good researcher, heneeds not only clarifying the paradigm his research is positioned, but also integrating the theories in his paradigm.展开更多
对聚铁溶液进行 p H值和盐基度的分析和估算 ,给出了聚铁溶液的极限 p H值和极限盐基度与总溶解铁浓度的关系曲线。最终计算结果表明 :在平衡条件下 ,聚铁溶液的 p H值和盐基度具有相关性 ,即当其中一个参数发生变化时 ,另一个参数必然...对聚铁溶液进行 p H值和盐基度的分析和估算 ,给出了聚铁溶液的极限 p H值和极限盐基度与总溶解铁浓度的关系曲线。最终计算结果表明 :在平衡条件下 ,聚铁溶液的 p H值和盐基度具有相关性 ,即当其中一个参数发生变化时 ,另一个参数必然要发生相应的改变。随着总溶解铁浓度的不断升高 ,极限 p H值单调下降 ,而极限盐基度却单调递增。对于铁含量为 1 60 g/L的标准聚铁溶液 ,其最大 p H值为 1 .31 4,最高盐基度为 1 9.99%。展开更多
文摘This is a research report on the interrelationship among understanding, memory and oral expression in listening comprehension training. The research investigated 150 non-English majors through a questionnaire in a higher vocational college. The result indicates that the interrelationship among understanding, memory and oral expression in listening classes which are determined by the listening materials and teaching method directly influences students' listening proficiency and speaking ability. It is suggested that some strategies to be used to foster students' abilities in these three areas so as to improve their listening ability.
基金supported by Homeland Resource Non-Profit Research Special Funding Project(No.200911036)
文摘In recent years, most of domestic and foreign researches about heavy metal pollutions of metal mine mainly focus on water, soil and plants on the surface. There is lack of researches about heavy metal pollution in groundwater of metal mine. In this research, a certain antimony mine area is selected as a typical study area. Also, the study about statistical characteristics of heavy metals in groundwater has been carried out. Furthermore, the interrelationships have been preliminarily discussed through related analysis, such as relevant analysis, cluster analysis and principle component analysis. The results show that: the excessive elements in groundwater of study area are Sb, As, Pb, Se, and Ni. The average mass concentration of Sb, As, and Pb is higher than that of drinking water standards(GB5749-2006). The concentration of most heavy metals in dry season is lower than or equal to that in wet season for groundwater. Zn is the only metal in groundwater showing a different pattern, the concentration of which in dry season is higher than that in wet season. Under the impacts of stratum leaching and absorption effect, the concentration of heavy metals(except Pb and Ba) in groundwater are lower than or equal to that in surface water. As and Se, the two heavy metals have a significant positive correlation, which shows the two elements might have gone through similar environmental geochemical effect. Also, the connection among Zn, Hg, Pb, and Mn is not obvious; therefore, the sources of those elements are quite different. In addition, the elements of Se and As have obvious positive interrelationship with elements of CO_3^(2-) and F^-. Also, the Pb has significant positive correlation with PO_4^(3-), H_2SiO_3 and oxygen consumption. The results of cluster analysis show that 9 different heavy metals in the study area can be divided into 3 categories: Zn, Cd, Mn, Hg, Cu, and Cr belong to the first category, Se and As belong to the second one, and the last category is Pb. Also, the principle component analysis divides 6 heavy metals(Zn, As, Hg, Pb, Mn, and Se) into 4 different principle components, which can be utilized to assess heavy metals pollution situations in groundwater. The reliability of this method is higher than 91%. Moreover, the research provides theory basis and models for establishing evaluation index system and exploring the evaluation method of heavy mental pollution in groundwater.
文摘The authors designed a specific primer of EB virus Bam W fragment and EBV DNA sequence by using the polymerase chain reaction（PCR） to amplify the EBV DNA sequences and the performing the hybridization analysis（dolblot and Southern transfer） with a γP labelled internal olignoucleotide probe.
文摘This article discusses the importance of theory and paradigm to a researcher. It starts from introducing and analyzing thedefinition of the two terms, by using the theories in the field of intercultural communication as examples. To a good researcher, heneeds not only clarifying the paradigm his research is positioned, but also integrating the theories in his paradigm.
