By comparing the changes from the Organization for Economic Co-operation and Development's results of Programme for International Student Assessment(PISA)2018 and 2022,it is found that 15-year-old students in East...By comparing the changes from the Organization for Economic Co-operation and Development's results of Programme for International Student Assessment(PISA)2018 and 2022,it is found that 15-year-old students in East Asian countries and economies maintain a commanding lead in reading,mathematics,and science.These students from regions such as Singapore,Japan,the Republic of Korea,Hong Kong(China),Macao(China),and Chinese Taipei not only sustain their academic excellence but also experience improvements in learning efficiency and their sense of belonging at school.Drawing on the PISA 2022 data,this study analyzes students'learning time investment,out-of-school-hours(OsH)services,and their relationship with student academic performance.The results show that the above countries and economies have achieved encouraging results in academic burden reduction by decreasing learning time in regular school lessons,controlling homework time,and providing OsH services.These distinctive policy interventions can serve as valuable reference points for the Chinese Mainland's ongoing implementation of the"double reduction"policy while facilitating an informed judgment of potential risks.展开更多
The oxidation ditch process is economic and efficient for wastewater treatment, but its application is limited in case where land is costly due to its large land area required. An innovative integrated oxidation ditch...The oxidation ditch process is economic and efficient for wastewater treatment, but its application is limited in case where land is costly due to its large land area required. An innovative integrated oxidation ditch with vertical circle(IODVC) system was developed to treat domestic and industrial wastewater aiming to save land area. The new system consists of a single channel divided into two ditches(the top one and the bottom one by a plate), a brush, and an innovative integral clarifier. Different from the horizontal circle of the conventional oxidation ditch, the flow of IODVC system recycles from the top zone to the bottom zone in the vertical circle as the brush is running, and then the IODVC saved land area required by about 50% compared with a conventional oxidation ditch with an intrachannel clarifier. The innovative integral clarifier is effective for separation of liquid and solids, and is preferably positioned at the opposite end of the brush in the ditch. It does not affect the hydrodynamic characteristics of the mixed liquor in the ditch, and the sludge can automatically return to the down ditch without any pump. In this study, experiments of domestic and dye wastewater treatment were carried out in bench scale and in full scale, respectively. Results clearly showed that the IODVC efficiently removed pollutants in the wastewaters, i.e., the average of COD removals for domestic and dye wastewater treatment were 95% and 90%, respectively, and that the IODVC process may provide a cost effective way for full scale dye wastewater treatment.展开更多
基金supported by the 2022 Shanghai Pujiang Talent Program"Research on the Production and Dissemination Mechanisms of International Large-Scale Education Assessment and Chinese Approaches under the Background of Global Talent Competition"project(No.22PJC092)。
文摘By comparing the changes from the Organization for Economic Co-operation and Development's results of Programme for International Student Assessment(PISA)2018 and 2022,it is found that 15-year-old students in East Asian countries and economies maintain a commanding lead in reading,mathematics,and science.These students from regions such as Singapore,Japan,the Republic of Korea,Hong Kong(China),Macao(China),and Chinese Taipei not only sustain their academic excellence but also experience improvements in learning efficiency and their sense of belonging at school.Drawing on the PISA 2022 data,this study analyzes students'learning time investment,out-of-school-hours(OsH)services,and their relationship with student academic performance.The results show that the above countries and economies have achieved encouraging results in academic burden reduction by decreasing learning time in regular school lessons,controlling homework time,and providing OsH services.These distinctive policy interventions can serve as valuable reference points for the Chinese Mainland's ongoing implementation of the"double reduction"policy while facilitating an informed judgment of potential risks.
文摘The oxidation ditch process is economic and efficient for wastewater treatment, but its application is limited in case where land is costly due to its large land area required. An innovative integrated oxidation ditch with vertical circle(IODVC) system was developed to treat domestic and industrial wastewater aiming to save land area. The new system consists of a single channel divided into two ditches(the top one and the bottom one by a plate), a brush, and an innovative integral clarifier. Different from the horizontal circle of the conventional oxidation ditch, the flow of IODVC system recycles from the top zone to the bottom zone in the vertical circle as the brush is running, and then the IODVC saved land area required by about 50% compared with a conventional oxidation ditch with an intrachannel clarifier. The innovative integral clarifier is effective for separation of liquid and solids, and is preferably positioned at the opposite end of the brush in the ditch. It does not affect the hydrodynamic characteristics of the mixed liquor in the ditch, and the sludge can automatically return to the down ditch without any pump. In this study, experiments of domestic and dye wastewater treatment were carried out in bench scale and in full scale, respectively. Results clearly showed that the IODVC efficiently removed pollutants in the wastewaters, i.e., the average of COD removals for domestic and dye wastewater treatment were 95% and 90%, respectively, and that the IODVC process may provide a cost effective way for full scale dye wastewater treatment.
