A STUDY ON PHYSICO-MECHANICAL AND ANTICORROSIVE PROPERTIES OF CHEMICALLY MODIFIED GRAPHENE-BASED EPOXY NANOCOMPOSITE COATINGS

The use of coatings of functionalized nanostructured carbon based composite to inhibit corrosion is an area getting much of attention among scientists and industrialists. Lately, Graphene has started to play an important role in many applications. Graphene possesses excellent mechanical and thermal stability, low chemical reactivity, impermeability to most of gases, and high transparency. Thanks to these properties, Graphene is so far finding some applications for protective coatings. However, Graphene is apolar and nanostructured, so that is difficult to be dispersed into polar polymers as epoxy resin. In this paper, results of using chemically modified Graphene to reinforce the physico-mechanical properties and corrosive resistance properties of the epoxy paint coating are presented. Graphene was modified by oxidative method with mixtures of H2SO4, H3PO4 and KmnO4 solutions. The properties of obtained products were characterized by somephysico-chemical methods such as Fourier transformed Infrared Spectroscopy (FTIR), X-ray diffraction (XRD). The physico-mechanical and anti-corrosion properties of paints based on chemically modified Graphene-epoxy nanocomposite have been exceptionally superior to that of paints based on epoxy and Graphene

THE EFFECT OF NANOCARBON MATERIALS STRUCTURES ON THE PERFOMANCES OF EPOXY-BASED PAINT COATING FOR STEEL SURFACES

This paper reports the effect of the nanocarbon materials addition on the physico-mechanical properties and corrosion protective ability of epoxy based paint coatings for the steel surfaces. In this work the nanotubes and nanosheets (layers) structures of nanocarbon materials were used for the investigation. The properties of received products were measured by the test techniques for paint coating characterization. The results showed that the addition of the nanocarbon materials (only ratio of 0.1 wt%) significantly improved the physico-mechanical performance and corrosion protection ability of epoxy coatings for steel surfaces. However improvement quantity depends on the structure of nanocarbon materials. The obtained results showed that the nanosheets structure of carbons coatings made the physico-mechanical properties of the epoxy coating increased better than those of nanotube structure.

Digital Transformation of the Banking Industry in Developing Countries

Purpose:  The study's objective is to test the impact of digital transactions on banking performance. Based on the previous research and the actual situations, it has been recognized that the critical role of digital banking is in developing the banking industry, especially in developing countries.   Theoretical framework:  In the next section, the study presents background information to promote the research. The digital transformation has changed how customers use financial services. This has pushed banks to adapt more quickly to the wave of digital transformation if they don't want to lose their valuable customer base.   Design/methodology/approach:  the methodology applied uses POOL, FEM, REM, and FGLS models to examine the impact of banking transactions made by digital technology on the bank's deposit and lending revenue. This article studies banking operations on digital platforms from 2012 to 2019 in developing countries.   Findings: The article's findings showed that digital banks' flexible products and services bring many benefits with a high level of interaction, such as supporting the relationship between customers and banks and improving operating revenue.   Research, Practical & Social implications: Practical implications enhanced the development potential of digital banking is relatively large, stemming from the market demand development orientation of the banking industry.   Originality/value: The paper's originality and value help banks invest in digital technology as the way forward to better serve their customers

EFL STUDENT’S PROBLEMS WITH PARAGRAPH WRITING AT TAY DO UNIVERSITY, VIETNAM

This paper studied problems in EFL students’ paragraph writing. The research participants were first-year students of English in Tay Do University (TDU). To achieve the desired aims of the current study, the researcher combined both qualitative and quantitative methods, using questionnaires, interviews, and observations as the main instruments. The researcher used the package of social sciences (SPSS) for analysis. Research results showed that the freshmen at TDU often encountered problems in writing paragraphs. These accounted for grammatical structures, vocabulary, and coherence. Basing on the research results, students could recognize their difficulties when writing and find some new ways to overcome them. It is suggested that teachers should find and update some new teaching methods so as to develop students’ paragraph writing skills. Article visualizations

SOME COMMON ERRORS IN ENGLISH SPEAKING CLASS OF ENGLISH MAJORED FRESHMEN AT TAY DO UNIVERSITY, VIETNAM

In the 21st century, speaking is considered to be one of the most important skills for language learners. However, it is so difficult for students to master this skill. It is so difficult for students to master this skill because they encounter in some common mistakes when speaking in class. Therefore, the purpose of this research aimed at finding out common errors in English speaking class of English majored freshmen at Tay Do University. Specifically, this study is done to figure out whether English majored freshmen at Tay Do University encounter regularly with some mistakes while speaking English in class. In this study, a questionnaire embraced 28 questions, including questions and statements which were used as the main instruments to collect the data. The participants in this study were 91 English majored freshmen in the 3 classes of English 14A, 14B, 14C at Tay Do University. The results of the study pointed out that the English-majored freshmen had some common errors and difficulties with vocabulary, pronunciation, psychology in English speaking class. It is hoped that this research can be helpful for both the English-majored freshmen and other non-majored English students at Tay Do University to realize their common errors in the process of improving and developing their speaking skill. Article visualizations

A SURVEY ON THE DIFFICULTIES IN WRITING ESSAYS OF ENGLISH MAJORED SOPHOMORES AT TAY DO UNIVERSITY, VIETNAM

This thesis “A study on the difficulties in writing essays of English-majored sophomores at Tay Do University” was conducted to examine the difficulties that second-year students majoring in English often met in writing essays. For this purpose, the participants in this study were 100 English majored sophomores in classes 14A, 14B and 14C at Tay Do University. The interview with 3 extended statements for English majored teachers and a questionnaire with 25 closed statements for students is used as instruments to collect the data. The data from the interview and questionnaire were collected to make clear and prove the problems that the students have had in writing essays. The study figured out some difficulties about background knowledge, vocabulary, grammar structure, idea arrangement and orthography in writing essays faced by English majors sophomores at Tay Do University. Besides, this study also helps students realize their challenges and improve their writing essays.  Article visualizations

Factors Affecting Firms’ Performance: The Case of Vietnam construction firms

In the context of Vietnam's international economic integration, improving the performance of enterprises is increasingly important because it not only affects businesses but also affects the development prospects of the economy. The purpose of the paper is to consider the impact of factors on the performance of listed construction companies in the period of 2012-2018. By means of an empirical analysis, this study uses Eviews econometric software and table data techniques. This study found the factors that positively impact on performance are asset structure, capital structure and firm size that negatively impact the performance of Vietnam listed construction firms. These findings support business administrators in selecting appropriate business and production plans to increase the operating performance of businesses in the construction industry. Keywords: Profitability, construction firms DOI: 10.7176/RJFA/11-2-15 Publication date: January 31st 202

THE RELATIONSHIP BETWEEN LEARNING STRATEGY USE IN ENGLISH AND MOTIVATION OF STUDENTS AT A COLLEAGUE IN CAN THO CITY, VIETNAM

Among the many factors that increase students’ achievement in the mastery of foreign languages, including English, are motivation and use of language learning strategies. Previous studies by a range of researchers have identified these two elements as the most important in obtaining success in language learning. This study carried out on 152 university students, roughly equal in gender, studying at a university in Can Tho, Vietnam, sought to discover the relationships between these two factors within the Vietnamese language learning context. In particular, the study sought to 1) discover which of two types of motivation, intrinsic and extrinsic, is most prevalent among the students studied; 2) their use of language learning strategies; 3) reveals the relationship between students' motivation and use of language learning strategies; and 4) describe the differences in their use of language learning strategies based on whether their motivation was high, medium or low. Research instruments included Schmidt et al.'s Questionnaire on Motivation in Learning English, and Oxford's Strategy Inventory for Language Learning (both modified for the Vietnamese language learning context and translated into Vietnamese), plus an interview with 18 of the students to gain greater insight into the answers they gave on the questionnaires. Results were obtained using standard deviations and t-tests. They showed that Vietnamese university students are mainly extrinsically motivated; that all strategies were used at least at a medium level, amidst other fluctuations; and that those metacognitive strategies are most prevalent among medium and high motivated students but affective strategies are most common among low motivation students. Recommendations flowing from these results are that teachers should prioritize the formal teaching of learning strategies and should attempt to increase intrinsic motivation by putting greater emphasis on making language learning fun and relevant to the students' interests and passions. Article visualizations