The objective of this paper is to explore the reliability of Online Automatic Scoring(OAS)through the comparison of OAS and Teacher Scoring(TS),and further demonstrate the feasibility of the integration of the two sco...The objective of this paper is to explore the reliability of Online Automatic Scoring(OAS)through the comparison of OAS and Teacher Scoring(TS),and further demonstrate the feasibility of the integration of the two scoring methods.The Pearson correlation statistics of the two scoring results of 115 compositions are processed with SPSS analysis software,indicating that the correlation between the two reaches 0.83,which means that OAS is relatively reliable in dealing with students’compositions.After the second stage of the TS experiment,the questionnaire results show that students generally recognize the OAS and have a clear understanding of the advantages and disadvantages of the two scoring methods.Combined with the students’interview,the conclusion is that the OAS is reliable and the integration of the two scoring methods will have a better effect.展开更多
Based on the Mg^(2+)complexation with acid chrome blue K(ACBK)at pH 10.2,an automatic system was designed to determine total hardness of water.The system consists of a vector colorimeter,a multi-channel sampling pump ...Based on the Mg^(2+)complexation with acid chrome blue K(ACBK)at pH 10.2,an automatic system was designed to determine total hardness of water.The system consists of a vector colorimeter,a multi-channel sampling pump and both reagents A and B.Two kinds of reagent solutions were prepared and used in this system,i.e.,ammoniacal buffer and ACBK—disodium magnesium EDTA solutions.The experimental results of the standard solutions containing 2 and 3 mg/L of total hardness showed that the relative standard deviations(RSDs)were 1.9%and 2.2%,respectively,and the limit of detection(LOD)was only 0.035 mg/L.The detection of four natural water samples showed that the recoveries were between 85.0%and 108.6%,consistent with those obtained by ICP-AES method.展开更多
基金Funded by Shandong Social Science Planning Program(山东省社科规划项目).
文摘The objective of this paper is to explore the reliability of Online Automatic Scoring(OAS)through the comparison of OAS and Teacher Scoring(TS),and further demonstrate the feasibility of the integration of the two scoring methods.The Pearson correlation statistics of the two scoring results of 115 compositions are processed with SPSS analysis software,indicating that the correlation between the two reaches 0.83,which means that OAS is relatively reliable in dealing with students’compositions.After the second stage of the TS experiment,the questionnaire results show that students generally recognize the OAS and have a clear understanding of the advantages and disadvantages of the two scoring methods.Combined with the students’interview,the conclusion is that the OAS is reliable and the integration of the two scoring methods will have a better effect.
基金supported by both the Foundation(PCRRK21005)of State Key Laboratory of Pollution Control and Resource Reuse(Tongji University)The National Key Research and Development Program of China(2019YFC1805300)
文摘Based on the Mg^(2+)complexation with acid chrome blue K(ACBK)at pH 10.2,an automatic system was designed to determine total hardness of water.The system consists of a vector colorimeter,a multi-channel sampling pump and both reagents A and B.Two kinds of reagent solutions were prepared and used in this system,i.e.,ammoniacal buffer and ACBK—disodium magnesium EDTA solutions.The experimental results of the standard solutions containing 2 and 3 mg/L of total hardness showed that the relative standard deviations(RSDs)were 1.9%and 2.2%,respectively,and the limit of detection(LOD)was only 0.035 mg/L.The detection of four natural water samples showed that the recoveries were between 85.0%and 108.6%,consistent with those obtained by ICP-AES method.
