A research on the application of a TG-DTA(thermal gravimetry aifferential thermal analysis)to the quick determination of moisture,organic volatile fixed carbon,ash and caloric value for coal is described.
The College English Test Band Six(CET-6)is one of the most widely applied exam across China.As a national teaching test,CET-6 is sponsored by the Department of higher education of the Ministry of education of The Peo...The College English Test Band Six(CET-6)is one of the most widely applied exam across China.As a national teaching test,CET-6 is sponsored by the Department of higher education of the Ministry of education of The People’s Republic of China and held twice a year.In this study,77 sophomores of different majors were tested using the listening test in June 2018.It is ensured that the test method is exactly same as that of CET-6.The purpose of this paper is to analyze the content and specification of CET-6 listening comprehension test,and to evaluate this part in detail according to the real data,including score report and item analysis,trying to provide some enlightenment for the revision of the examination.展开更多
We present PerformanceVis,a visual analytics tool for analyzing student admission and course performance data and investigating homework and exam question design.Targeting a university-wide introductory chemistry cour...We present PerformanceVis,a visual analytics tool for analyzing student admission and course performance data and investigating homework and exam question design.Targeting a university-wide introductory chemistry course with nearly 1000 student enrollment,we consider the requirements and needs of students,instructors,and administrators in the design of PerformanceVis.We study the correlation between question items from assignments and exams,employ machine learning techniques for student grade prediction,and develop an interface for interactive exploration of student course performance data.PerformanceVis includes four main views(overall exam grade pathway,detailed exam grade pathway,detailed exam item analysis,and overall exam&homework analysis)which are dynamically linked together for user interaction and exploration.We demonstrate the effectiveness of PerformanceVis through case studies along with an ad-hoc expert evaluation.Finally,we conclude this work by pointing out future work in this direction of learning analytics research.展开更多
This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data inclu...This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data included students＇ answers to test items as well as a post-test questionnaire and teachers＇ responses to semi-structured interviews. It was found that overall, the test functioned satisfactorily, with most items moderately easy yet discriminating, and high internal consistency and strong correlations among subscale scores. However, item analysis and content review of the test identified some items with incorrect or multiple keys, which may result from a combination of EFL teachers＇ inadequate language proficiency and their attempts to write attractive distractors.展开更多
文摘A research on the application of a TG-DTA(thermal gravimetry aifferential thermal analysis)to the quick determination of moisture,organic volatile fixed carbon,ash and caloric value for coal is described.
文摘The College English Test Band Six(CET-6)is one of the most widely applied exam across China.As a national teaching test,CET-6 is sponsored by the Department of higher education of the Ministry of education of The People’s Republic of China and held twice a year.In this study,77 sophomores of different majors were tested using the listening test in June 2018.It is ensured that the test method is exactly same as that of CET-6.The purpose of this paper is to analyze the content and specification of CET-6 listening comprehension test,and to evaluate this part in detail according to the real data,including score report and item analysis,trying to provide some enlightenment for the revision of the examination.
基金the U.S.National Science Foundation through grants IIS-1455886 and DUE-1833129the Schlindwein Family Tel Aviv University-Notre Dame Research Collaboration,United States Grant.Haozhang Deng,Xuemeng Wang,Zhiyi Guo,and Ashley Decker conducted this work as an undergraduate research project at the University of Notre Dame during Summer 2019.
文摘We present PerformanceVis,a visual analytics tool for analyzing student admission and course performance data and investigating homework and exam question design.Targeting a university-wide introductory chemistry course with nearly 1000 student enrollment,we consider the requirements and needs of students,instructors,and administrators in the design of PerformanceVis.We study the correlation between question items from assignments and exams,employ machine learning techniques for student grade prediction,and develop an interface for interactive exploration of student course performance data.PerformanceVis includes four main views(overall exam grade pathway,detailed exam grade pathway,detailed exam item analysis,and overall exam&homework analysis)which are dynamically linked together for user interaction and exploration.We demonstrate the effectiveness of PerformanceVis through case studies along with an ad-hoc expert evaluation.Finally,we conclude this work by pointing out future work in this direction of learning analytics research.
基金sponsored by "The Fundamental Research Funds of Shandong University"
文摘This study investigated the assessment skills of secondary EFL teachers through analyzing the quality of test items on a municipal English examination for eighth graders in a city located in northern China. Data included students＇ answers to test items as well as a post-test questionnaire and teachers＇ responses to semi-structured interviews. It was found that overall, the test functioned satisfactorily, with most items moderately easy yet discriminating, and high internal consistency and strong correlations among subscale scores. However, item analysis and content review of the test identified some items with incorrect or multiple keys, which may result from a combination of EFL teachers＇ inadequate language proficiency and their attempts to write attractive distractors.
