Finite Element Analysis of Magnetic Field Single-Turn Systems
Modelling of pulsed magnetic systems has extensive application in the optimisation of electromagnetic metal forming as well as in pulsed ultrahigh field generation systems. This paper presents a detailed three-dimensional finite element analysis model to be used in such power systems and compares simulated solutions with accurate experimental data.
A fast and compact θ-pinch electromagnetic flux-compression generator
Ultrahigh magnetic fields up to 300 T (3 MG) have been generated by electromagnetic flux compression using only 63 kJ from a fast capacitor bank to implode aluminium liners, with 14.7 kJ from a slow capacitor bank needed to provide an initial magnetic field. With no initial field present, pulses of magnetic flux density having a time rate-of-change exceeding 3 × 108 T s−1 have been produced and measured, opening the way for a range of dynamic transformer applications. The outcome of the work suggests that, when using fast multi-MA banks, flux compression can be viewed as an alternative to the single-turn coil technique that will move the boundary of the magnetic fields well beyond 300 T without the need for significant additional investments.
English Code-Mixing and Code-Switching in Thai Songs
This study aims to investigate the attitudes of Thai people toward English code-mixing and code-switching in Thai songs and to find out if English code-mixing and code-switching in Thai songs could be an effective pedagogical instrument for learning the English language. The researcher selected a target population of 50 Thai participants (25 adolescent and 25 middle aged participants) and, by using a questionnaire, surveyed their attitudes towards the mixing and switching of English vocabulary in Thai songs. In addition to the questionnaire, two from the 50 participants were interviewed. One was an adolescent who has a very good knowledge of English and the other was a middle aged participant with almost no knowledge of English. The findings show that a majority of the middle aged participants disagree on the positive attitudes and reasons of people who listen to Thai songs which mix and switch the English language while a majority of the adolescent participants believe that some people who listen to Thai songs which mix and switch the English language are knowledgeable as well as show good taste and have a high social status. On the other hand, both the adolescent and middle aged group agree that some Thai songs which mix and switch the English language sound annoying and are inconsistent in conveying the meaning of the lyrics. Both groups also agree that Thai songs which mix and switch the English language may help listeners to enhance their knowledge of the English language. When interviewed individually, the participant who is very good in the English language tended to emphasize only the English competency of the listeners; while the participant who does not have any knowledge of the English language tended to emphasize the listeners‟ liking of the lyrics, the meaning and the melody of the songs. However, the use, as a pedagogical instrument, of Thai songs which mix and switch the English language could open up an additional choice for language learners in English vocabulary learning. Such songs would be acceptable as an effective pedagogical instrument for learning the English language if the English words in the songs also show correct English syntax.