This article presents The Analysis for high-Voltage Electric Stress in Lp and Ls coils of Tesla Transformer for studying the efficiency design. The tesla transformer is designed at 350kV rating Voltage and 120 kHz resonant frequency. The effect of high voltage when we designed the coil has impact to Electric Stress between primary and secondary coil because the tesla transformer uses air core. The insulator of coil also has problem on the reason as flashover on the 2 coils. The best dimension among coil has to present in this paper by using optimal mathematical solution. The simulation results show performance of the solution and ensure the methodology with positive way.

Presently the application of computer technologies for pedagogical purposes have been spectacularly realised across a variety of disciplines. In terms of foreign language teaching and learning; researchers educators and teachers are aware of the increasingly prominent role of computer-assisted language learning (CALL). The article therefore manifests interesting research findings and opinions concerning computer usage in the sphere of language education. In the first section the emphasis is put on history and new trends of CALL usage. Then computer and language learning and teaching are discussed through contrastive points of view based on a literature study of researchers and educators involved in language pedagogy. Instead of reviewing extensive advantages of CALL for both teachers and learners limitations are also discussed particularly for the teachers to gain a critical insight as to how computer technologies may affect language learners and classrooms. Finally suggestions and recommendations for integrating CALL into language classroom are provided in order to maximise the exploitation of computer technologies to its full potential.

Hydraulic machines were used in both medium and large scale From industries studying problems of hydraulic systems around 70-80 percentage of the machine expiration was due to the deterioration of hydraulic oil from contamination so the best way to maintain the hydraulic machine was to take care of hydraulic oil to have the purity level and other properties suitable for the components in those machines. This article described the duty of hydraulic oil types of contamination sources of contamination the standard for measuring the purity level of oil equipments used to measure and analyze the contamination in hydraulic oil recommended purity levels the effects from the contamination in hydraulic oil to machine and methods to protect and to eliminate the contamination in hydraulic oil. All of these were useful as the guidelines to maintain the hydraulic machines to work in high efficiency and more long life time.

English is now regarded as an important medium for international communication among people all around the world in politics education economics and tourism. Vocabulary is an important fundamental element for learning English. It is necessary for students to have lexical knowledge to develop their language proficiencies and communicative competence but Thai undergraduate students are not generally equipped with sufficient lexical items. The concepts and pedagogical implications of the lexical-based learning approach are proposed. It is hoped that this article will be highly beneficial to syllabus design and language instruction in the near future.

The objective of this research is to study the factors of resource and investment affecting to the number of post graduate students of Rajamangala University of Technology Phra Nakorn. The samples of this research are to survey the group of lecturers from 9 faculties by answering the questionnaires.