The effect of steam-treatment to HZSM-5 zeolite and Mo/HZSM-5 with a steaming time range of 0.5-1 h on the catalytic performance of methane dehydro-aromatization （MDA） over Mo/HZSM-5 catalyst prepared with impregnat...The effect of steam-treatment to HZSM-5 zeolite and Mo/HZSM-5 with a steaming time range of 0.5-1 h on the catalytic performance of methane dehydro-aromatization （MDA） over Mo/HZSM-5 catalyst prepared with impregnation has been studied in detail in combination with the characterization of 1H MAS NMR technique. Both the deactivation rate constant （kd） and the Brtnsted acid sites per unit cell were calculated to quantitatively evaluate the stability of Mo/HZSM-5 catalysts treated with steam at 813 K before and after impregnation of molybdenum species, and the corresponding variation of their Brtnsted acid sites. The results reveal that a V-shape relationship between kd and the number of B 1 acid sites per unit cell is presented on Mo/HZSM-5 catalyst under the tested steam-treatment and reaction conditions.展开更多
The absence or inadequacy of critical thinking is one of the prevalent problems in English teaching and learning in China, which gives rise to various problems in learners’ writing: digression from the topic, unorigi...The absence or inadequacy of critical thinking is one of the prevalent problems in English teaching and learning in China, which gives rise to various problems in learners’ writing: digression from the topic, unoriginal or uncreative ideas, loose logic, logical fallacies, and lack of real content. Under such circumstances, the present paper proposes the “teaching-learning-assessing-testing Four in One” flipped classroom mode in Educational Informatization 2.0 Background to develop learners’ critical thinking ability relying on technical support provided by the researcher’s school and the mode is then applied in English writing course. The application of the mode has achieved some effects. It is applauded by learners and may thus have some implications for the development of learners’ critical thinking ability in writing courses.展开更多
A brief review of the history shows that China’s educational pendulum has always swung between English as an important practical tool for China to connect with the world and English as a threat to Chinese language an...A brief review of the history shows that China’s educational pendulum has always swung between English as an important practical tool for China to connect with the world and English as a threat to Chinese language and culture.In recent years,China sees a rising concern over the declining of Guoxue,or the study of traditional Chinese culture,and the absence of Chinese culture in College English pedagogy.A survey conducted in South China University of Technology shows that even for non-English majors with good English competency,their ability to express local cultures in English is weak.However,despite some experts’calling for reducing the proportion of English in education,this paper holds that English should be restored to its place as a lingua franca and that the reform of College English education is urgent and desirable.The integration of Chinese culture into College English can be achieved by such ways as re-editing the“Syllabus”,renewing textbooks,improving teachers’competency,and revising the assessment methodologies.展开更多
基金supported by Foundation for University Key Teacher by the Education of Heilongjiang Province(No.1152G018)
文摘The effect of steam-treatment to HZSM-5 zeolite and Mo/HZSM-5 with a steaming time range of 0.5-1 h on the catalytic performance of methane dehydro-aromatization （MDA） over Mo/HZSM-5 catalyst prepared with impregnation has been studied in detail in combination with the characterization of 1H MAS NMR technique. Both the deactivation rate constant （kd） and the Brtnsted acid sites per unit cell were calculated to quantitatively evaluate the stability of Mo/HZSM-5 catalysts treated with steam at 813 K before and after impregnation of molybdenum species, and the corresponding variation of their Brtnsted acid sites. The results reveal that a V-shape relationship between kd and the number of B 1 acid sites per unit cell is presented on Mo/HZSM-5 catalyst under the tested steam-treatment and reaction conditions.
文摘The absence or inadequacy of critical thinking is one of the prevalent problems in English teaching and learning in China, which gives rise to various problems in learners’ writing: digression from the topic, unoriginal or uncreative ideas, loose logic, logical fallacies, and lack of real content. Under such circumstances, the present paper proposes the “teaching-learning-assessing-testing Four in One” flipped classroom mode in Educational Informatization 2.0 Background to develop learners’ critical thinking ability relying on technical support provided by the researcher’s school and the mode is then applied in English writing course. The application of the mode has achieved some effects. It is applauded by learners and may thus have some implications for the development of learners’ critical thinking ability in writing courses.
基金This research has been supported by National Social Science Fund of China(Project 20CWW007)Philosophical and Social Science Development Plan of Guangzhou(Project 2020GZGJ28).
文摘A brief review of the history shows that China’s educational pendulum has always swung between English as an important practical tool for China to connect with the world and English as a threat to Chinese language and culture.In recent years,China sees a rising concern over the declining of Guoxue,or the study of traditional Chinese culture,and the absence of Chinese culture in College English pedagogy.A survey conducted in South China University of Technology shows that even for non-English majors with good English competency,their ability to express local cultures in English is weak.However,despite some experts’calling for reducing the proportion of English in education,this paper holds that English should be restored to its place as a lingua franca and that the reform of College English education is urgent and desirable.The integration of Chinese culture into College English can be achieved by such ways as re-editing the“Syllabus”,renewing textbooks,improving teachers’competency,and revising the assessment methodologies.
