To deepen understanding of the mechanisms influencing teachers' engagement in online professional discussions, this study adopts a configurational approach to explore 56 discussion cases within a three-year teachers' online professional learning community from a complex dynamic perspective. It considers the combined influence of various discussion features - including discussion time, design, and facilitation - through two rounds of crisp-set Qualitative Comparative Analysis (csQCA). Separate analysis was conducted for teachers' individual participation and group interaction. After calculating necessity, creating truth table, verifying robustness, examining interactive effects, and explaining the configurations, we identify significant nuanced differences in the formation mechanisms of highly completed discussions versus highly interactive discussions. Highly completed discussions exhibit a periodic pattern and high authenticity, whereas highly interactive discussions show a periodic yet decreasing pattern and high collaboration levels. This periodicity in both individual learning and social learning reflects teachers' recurring work-learning conflict and burnout. Consequently, designing and scheduling online discussions needs to take time factors into consideration. Furthermore, well-designed discussion prompts and sufficient facilitation collectively enhance teachers' engagement in discussions within online professional learning communities, especially that practice-oriented design optimizes teachers' individual participation, while clear collaborative requirements strengthen teachers' group interaction.

Given the changing nature of literacy, it is critical to investigate how learners communicate using the multimodal affordances of digital platforms. Guided by metafunctions of Systemic Functional Linguistics, this study developed a multimodal analytical framework to quantify multimodal composing with indicators of functional meaning to evaluate students' multimodal literacy practices from an overall perspective. Based on a high school digital literacy SPOC (Small Private Online Course), this study adopted a mixed-method approach to profile students' multimodal posting and examine teachers' and students' perceptions. The empirical findings included that: (1) Five profiles were identified based on students' ideational, interpersonal, and textual meaning differences: academic posters, sensational posters, visual posters, all-round posters, and perfunctory posters. Academic posters viewed multimodal posting as a presentation of research findings; sensational posters viewed multimodal posting as a connection with classmates; visual posters valued the formal beauty of multimodal posts; all-round posters remixed the ideational, interpersonal, and textual functions of multimodal posting; perfunctory posters viewed multimodal posting as a have-to-do task. (2) Teachers underestimated multimodal posting's interpersonal meaning that students valued. The SFL-based multimodal analytical framework and empirical findings provide implications for explicitly evaluating and guiding students' multimodal composition in digital environments.

数字素养是人们适应数字时代必不可少的能力素质,在基础教育阶段以数字化读写实践的方式开展数字素养教育具有必要性和紧迫性.虽然已有研究表明,教师角色和学生个体差异影响着学生的数字化读写实践,但对于教师和学生这两个维度交互作用的影响机制还缺少必要的关注.研究基于一门高中生数字素养在线课程,以质性比较分析方法为主线,综合采用开放性编码、关联性编码、内容分析等分析技术,考察教师的教学支持和教学反馈对不同性格特质、数字技能和读写能力的学生基于在线论坛的自主表达和人际互动两类数字化读写实践的影响.研究结果表明:第一,高质量的数字化读写实践是教师和学生维度多因素共同作用的结果,这些因素交互作用形成了不同的组态;第二,外向型性格、较高数字技能、较高读写能力的学生在基于在线论坛的数字化读写实践中具有明显优势;第三,教师在学生的数字化读写实践中具有辅助性影响,而非关键性影响,且这种辅助性影响主要体现在"促优",而非"扶弱".研究从微观层面上识别了教师和学生维度的多个因素作用于数字化读写实践的多重并发路径,对基础教育阶段数字素养在线教学中如何进行教学干预提供了基于证据的策略支持.

In order to further verify the teaching efficiency of A-Classroom Interactive System, and estimate the prospect of the application of A-Classroom Interactive System,this research uses empirical approach to undertake a group of contrast experiments and applies Flanders Interaction Analysis Approach, questionnaire method and interviewing method to analyze the experimental data. According to the results of the research, teaching with A-Classroom Interactive System obviously increases the interactivity in class, promote student’s learning initiative, activate the class atmosphere and enhance students’ comprehension of knowledge.Teachers and students hold a high recognition and satisfaction with A-Classroom Interactive System, so it has good application prospects in campus.

Objective:To evaluate the potential activitives of Chinese quince seed by studing the antioxidant activity and growth inhibition for HepG2 cells.Method:Chinese quince seed wereultrasound extracted by 80% ethanol.The antioxidant activities of then-butanol,ethyl acetate and water factions from the ethanol extractof seeds were assessed by ORAC,electrochemical and cellular oxidative stressmethod.The content of total phenolics and total flavonoids were detected by Folin-Ciocalteu's reagent method and NaNO 2-AlCl 3 colorimetric method.MTT was used to observe cell growth inhibition effect of three extracts.Results:Ethyl acetate extract had a better antioxidant capacity as well as the highest content of total phenolics and total flavonoids,thecontent of which were(1012.24±79.16) mg/100 g and(267.65±20.07) mg/g respectively.We presume that phenolics and flavonoids are the major antioxidants in Chinese quince seed.Inthe aspect of growth inhibition of HepG2 cells,the IC 50 of n-butanol extract was 344.8 μg/mL.Conclusion:Chinese quince seed extract not only has strong antioxidant activitives but also inhibited the growth of HepG2 cells.The results provided strong envidence for the development of antioxidant and anticancerproducts by Chinese quince seed.

After comparison of three popular art and physical examination system, we found that the existing system has several drawbacks, for example single means of communication, poor mobility, poor scalability, poor standardization etc. In order to meet the enrollment needs of the art and physical universities, it is necessary for us to use current advanced information technology to transform the existing art and physical examination system. New system should have the characteristics of wireless and standardization, this article describes the building ideas and block diagram of the system, discusses the key technologies in the system build process.

The purpose of the present work is to study the pancreatic lipase inhibitory effects of different subfractions (n-hexane, ethyl acetate (EA), n-butanol, and water) from ethanol extracts of nonfermented and fungi-fermented oats and to delineate the interactions of three primary phenolic acids in the EA subfractions. The EA subfraction showed the highest inhibitory effect on pancreatic lipase activity at 1.5 mg/mL compared to the other subfractions, regardless of whether the oats were fermented. Meanwhile, both of the EA subfractions of two fungi-fermented oats demonstrated more effective inhibitory activity than that of nonfermented oats. A positive correlation between the total phenolics content and inhibitory activity was found. The inhibitory ability of the EA subfraction from nonfermented or fermented oats also displayed a dose-dependent effect. The standards of caffeic, ferulic, and p-coumaric acids, mainly included in EA subfractions of fermented oats, also displayed a dose-dependent inhibitory effect. A synergistic effect of each binary combination of p-coumaric, ferulic, and caffeic acids was observed, especially at 150.0 μg/mL. Those results indicate that fungi-fermented oats have a more effective inhibitory ability on pancreatic lipase and polyphenols may be the most effective component and could be potentially used for dietary therapy of obesity.

The scavenging activities of 9 common flavonoid compounds against reactive oxygen species(ROS) such as hydrogen peroxide(H2O2),superoxide anion ion radicals(O2-·) and peroxynitrite radicals(ONOO-·) were assayed in vitro.Also,their first-order dissociation constants were determined spectrophotonmtrically.Of the investigated flavonoid compounds,flavonols had the strongest scavenging activity against three kinds of ROS,and flavanones and isoflavones had no obvious scavenging effect on them.A significant negative correlation was achieved between the scavenging activities against O2-· and ONOO-·and first-order dissociation constants of the investigated flavonoids.