Leakage current reduction is crucial for operating transformerlss PV systems. In this letter, a new three-phase topology and modulation strategy is proposed. It is derived from the single-phase ZVR (zero-voltage state rectifier) topology, but the operation mechanism is quite different. Therefore, a new modulation strategy based on the Boolean logic function is proposed to achieve the constant common mode voltage, so as to eliminate the leakage current. Finally, the experimental tests are carried out to verify the feasibility and effectiveness of the proposed solution.

This article will illustrate a typical English learning activity in an English training institution in Australia. Several international students, age ranging from 18 to 25 years old, were included in this study. All of these students are Asians, needing to improve their English level. Majority of the students come from Indonesia, Philippines, and China. The students attend the institution to improve their English skills before commencing their studies in Australian universities. There are 15 students from China and 5 students from other Asian countries, among which 12 are female students and 8 are male students. As the teachers are from China, some of them have a typical Chinese accent, while others have British or American accent. These are the context and setting of TESOL. From the perspective of one of the learners, an international student from China who had just arrived in Australia, the English learning context is general and typical in Australia, and there are also some common issues in learning in the context of TESOL. One of the issues is that students are quiet and do not actively respond to questions posed by the teachers. Another issue in TESOL is that most students are too shy to use English to communicate in the classroom.

The educational equity of undergraduate enrollment opportunities has always been a public concern today. There are a diversity of individual factors impacting on Chinese students undergraduate enrollment opportunities, including SES(socio economic status), parent educational level, parent educational participation, ethnic minorities and so forth. Through the correlation analysis of CFPS data, such as regression analysis, how these factors affect college admission opportunities has been deeply explored and discussed in this paper. The data includes 5055 samples, which can represent the characteristics and situations of Chinese family education to a certain extent. The results show that family SES is generally recognized as a key factor, and parents participation could help disadvantaged students promote academic performance. Furthermore, ethnic minorities and gender have a impact on the undergraduate enrollment opportunity.

In this paper, there are certain key factors that have a huge impact on learner identity. The difference in identity may either contribute or impede the process of language learning in EFL/EAL settings. Language socialization may be an effective strategy for facilitating the formation of learner identity in language learning.