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The purpose of this study was to give students a complete understanding of the derivative concept and at the same time help them to realize the critical applications of derivatives in many problems of physics, from which students see the close connection of mathematics and physics. Because this was a case study, the sample included only 30 grade 11 students in Ho Chi Minh City in Vietnam. The instrument included physics problems designed to show students the derivative development associated with some situations in physics. Reliable data were obtained, including students' worksheets, teacher conversations, and they were analyzed qualitatively to clarify students' understanding of derivative concepts and problem-solving abilities. It was reported that once the two-increase ratio boundary defined the derivative, the students involved in experiments realized the general significance of the derivative in calculating the instantaneous quantity change rate. This interdisciplinary approach also promoted the use of derivatives in many different contexts of science and practice, particularly in mathematics and physics.

Drying is one of the most important steps in tobacco processing because it determines the color, taste, and micronutrients in tobacco. The loading density and the arrangement of tobacco leaves in the drying chamber affect the temperature and humidity distribution of the air, thereby affecting the drying quality. In this paper, three drying cases with different tobacco weights were studied by computational fluid dynamics (CFD) simulation as well as experimental. The results show that when the loading density of the tobacco drying chamber increases, the local resistance of tobacco leaves increases sharply, and the velocity difference and temperature difference of the air in the tobacco drying chamber increases. The maximum temperature difference in the highest loading density reaches 10 K. The uneven temperature distribution of the air reduces the quality of the dried tobacco.

The coronavirus (Covid-19) in 2019 has significantly impacted society and threatened education globally. This crisis forced governments around the world to temporarily close educational institutions to reduce the spread of Covid-19. The educational institution is forced to implement Emergency Remote Teaching (ERT) in virtual learning to continue operations. During the pandemic, this topic received much attention from the research community. As a consequence, this study reviews ERT literature and conducts qualitative research (Becamex Business School case) to investigate the challenges of implementing ERT in developing countries to provide some insights for better preparation. The results show that most of the problems identified in previous studies correspond to the BBS case, in which themes such as infrastructure, materials, and training appear to be global issues. Meanwhile, several distinct ideas are generated from the BBS case, such as the age of lecturers can affect their acceptance and excitement towards ERT, or parents and friends can influence learner behaviors during the ERT period.