There are many methods and software for simulating materials in practice today, each software or computational method has its own advantages and disadvantages. In the process of studying and researching material simulation, we found that the VASP software combined with the Density Functional Theory (DFT) method is perfect up to this point. Reliability, accuracy, and low resource and time consumption during the calculation process are the standout advantages of this combination. DFT calculations on VASP require the precise construction of input data, including the input files, and it is not necessary to write code to process the output data, which is a significant advantage compared to other methods. Output data is processed through commonly used support software such as Origin and VESTA, which is an advantage of this simulation calculation method.

This study examines the use of Role-play in teaching business culture. The participants are 105 senior English majors at Thu Dau Mot University in Vietnam in the first semester of the 2024-2025 school year. This study investigates the perception of senior English majors toward the advantages and disadvantages of Role-play in the business culture courses and collects suggestions to improve this activity. One Questionnaire of Role-play is conducted at the end of the course to record the students’ overall perceptions and suggestions towards the application of Role-play during their study. The results of the Questionnaire show that the students are strongly interested in the use of Role-play during their course.

This article's primary goals are to provide design drawings, a description of the structure, an explanation of the working principle, and a kinematics calculation for text stamping machines. This machine has an electric motor, a gear-pinion transmission, a rotating disc-rod-slider mechanism and a hinged four-way mechanism. This is a simple, reasonably priced and useful device for administrative agencies' workstations. An ordinary administrative worker can also operate it. This device is about the same size as a laptop or printer. It operates by clamping the seal, stamping constantly onto A4 pages. The stamping speed can also be changed by varying the shaft speed of the electric motor. It is convenient, but it also has the disadvantage of requiring someone to put the paper in and take it out. The box frame of this machine is made of plastic or wood. Some transmission components are made of steel. When this machine works, the force applied to it and the force caused by it are very small, so in general it is very simple and safe. Keywords: Gear transmission – rack, rotating disc mechanism – connecting rod – slider, four-hinged mechanism, stamping machine.

English is one of the keys to successful globalization; therefore, every country develops own English teaching policy. Teaching English in Asia is a very common issue ruled and supported by the government. This article is a contrastive study on different English policies in such Southeast and East Asian countries as China, India, Indonesia, Japan, Malaysia, South Korea, Taiwan, and Vietnam. The contrastive analysis focused on such aspects as school year of implementing English as required subject, teaching hours of English, teacher’s training, use of local and foreign teachers, teaching methods and materials, funding, etc. The contrastive study among countries mentioned above evaluated the advantages and disadvantages of certain English teaching policies. The positive results of one country can be borrowed and adapted by another country considering its cultural, political, economic or social features. On the other hand, the failures of one country’s English teaching policy can be considered and avoided by another country’s planning on English teaching policy.

This paper explores the pros and cons of using online setting for teaching and learning English comparing with in-class setting. Online setting is undergoing a fast transformation and becomes a widely promoted platform due to COVID-19 pandemic. By reviewing different studies on online teaching, this paper aims to provide readers a better understanding about online setting. These information would be useful in Vietnam where online class just has a medium used and short history comparing with other developed and developing countries, so online class in Vietnam may need adjust and consideration based on different culture and learner’s experience. This paper also give some suggestions in design of online learning for English languages to increase the learning effectiveness.