Articles

Generation of electricity from wind power a renewable energy source, is continually attracting the attention of investors, researchers and electrical utilities. It has been predicted that the annual growth of wind power between 1998 and 2040 would be between 20% and 30%. This shows the increase in impact of the wind power generator to power system and the importance of understanding the behaviour power wind generator following fault conditions that may develop at any point on the hosted network and consequently may affect the stability, the security as well as the quality of power system. Hence, the searching Stability of power system with connection of power wind generator is continually attracting the attention of researchers in the world. This pape display the Surveying Stability of power system with connection of power wind generator when occurred the fault short circuit on the power system. The investigate is illustrated with network included 12 bus.

ABSTRACT With the ever-increasing development of technology, online teaching is more readily accepted as a viable component in teaching and learning, and blended learning, the combining of online and face-to-face learning, is becoming commonplace in many higher education institutions. Definitely, challenges cannot be denied; however, it has been suggested and deployed globally including Vietnam. To some extent, both teachers and students present their positive points of view on this learning approach. However, there are a huge number of students expressing their lack of understanding the blended learning, which negatively affects their attitudes towards deployment of this learning approach as well as particular reference to motivation and interest. This paper is to assess the English majors’ perceptions on blended learning environment at tertiary level, which especially affects their learning the writing skills. Results of the study are absolutely helpful for the author to understand the students’ perceptions of the effects on the blended learning; then, she can give some suggestions to enhance the learning of writing skills in the light of blended learning. Key word: Blended learning, academic writing, perception

This paper is devoted to study a fractional equation involving Caputo-Katugampola derivative with nonlocal initial condition. Unlike previous papers, in this paper, the source function of problem is assumed having a singularity. We propose some reasonable conditions such that the problem has at least one mild solution or has a unique mild solution. The desired results are proved by using the Banach, Leray-Schauder and Krasnoselskii fixed point theorems. Some examples are given to confirm our theoretical findings. Keywords: Caputo-Katugampola fractional derivative; Nonlinear integral equations; existence 2010 MSC: 26A33; 35A01; 35A02; 35R11

In this paper we discus on a Lyapunov-type inequality for a fractional differential equation involving sequential generalized Caputo fractional derivatives with boundary conditions. The results presented in this paper is new to the corresponding results in the literature.

Vegetables are the major source of dietary nitrate, with wide variations in nitrate content. The presence of nitrate in vegetables is often associated with harmful effects on human health. The study investigated nitrate of vegetables in Phu My ward, Hiep An ward, Tuong Binh Hiep ward, Thu Dau Mot city, Binh Duong province in 2020 by UV-VIS for determining of nitrat concentration, measurement wavelength of 410 nm. The vegetable samples were collected in the fields according to method of TCVN 9016:2011 and the nitrate contents were determinated according to method of TCVN 8742:2011 (Vietnam Ministry of Sciences and Technology, 2011). The results showed that there were 3 fresh spinach samples, 3 bok choy samples, contained the nitrate contents exceeded the regulations according to the regulations of nitrate contents in vegetables in the decisions of world health organization site (WHO). These results warn the farmers and policy administers of Thu Dau Mot city to give the solutions of nitrate-content controling in vegetables producing in Binh Duong.