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Evaluating Supports for Learner Autonomy in ELT Textbooks
Teguh Khaerudin,Alice Chik 아시아테플 2021 The Journal of Asia TEFL Vol.18 No.1
The promotion of language learner autonomy has become a standard policy ratified by many language education curricula. Textbooks, one of the key tools for curriculum implementation, have a crucial role in bringing the aspiration of learner autonomy into classroom practice. This study aims to evaluate how existing English textbooks used in Indonesia’s secondary schools support the development of learner autonomy, which is incorporated in current Indonesia’s curricular goals. Two frameworks, from Reinders (2010) and Nunan (1997), were used to evaluate the evidence and levels of supports for language learner autonomy development in five selected English textbooks. The evaluation shows that the current English textbooks have not provided enough tasks that support learner autonomy. When evident, supports are mostly at a very superficial level. The findings suggest that textbooks have not been adequately explored and exploited for developing language learner autonomy.
Numerical studies of the failure modes of ring-stiffened cylinders under hydrostatic pressure
Teguh Muttaqie,Do Quang Thang,PRABOWOADITYARIO,조상래,손정민 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.4
The present paper illustrates a numerical investigation on the failure behaviour of ring-stiffened cylinder subjected to external hydrostatic pressure. The published test data of steel welded ring-stiffened cylinder are surveyed and collected. Eight test models are chosen for the verification of the modelling and FE analyses procedures. The imperfection as the consequences of the fabrication processes, such as initial geometric deformation and residual stresses due to welding and cold forming, which reduced the ultimate strength, are simulated. The results show that the collapse pressure and failure mode predicted by the nonlinear FE analyses agree acceptably with the experimental results. In addition, the failure mode parameter obtained from the characteristic pressure such as interframe buckling pressure known as local buckling pressure, overall buckling pressure, and yield pressure are also examined through the collected data and shows a good correlation. A parametric study is then conducted to confirm the failure progression as the basic parameters such as the shell radius, thickness, overall length of the compartment, and stiffener spacing are varied.
Direct strength evaluation of the structural strength of a 500 cbm LNG bunkering ship
Teguh Muttaqie,DongHo Jung,Sang-Rai Cho,Jung Min Sohn 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.6
The present paper describes a general procedure of the structural safety assessment for the independent type C tank of LNG bunkering ship. This strength assessment procedure consists of two main scheme, global Finite Element Analysis (FEA) model primarily for hull structure assessment and detailed LNG Tank structures FEA model including the cylindrical tank itself and saddle-support structures. Two kinds of mechanism are used, fixed and slides constraints in fore and rear of the saddlesupport structures that result in a variation of the reaction forces. Finite Element (FE) analyses have been performed and verified by the strength acceptance criteria to evaluate the safety adequacy of yielding and buckling of the hull and supporting structures. The detail of FE model for an LNG type C tank and its saddle supports was made, which includes the structural members such as cylindrical tank shell, ring stiffeners, swash bulkhead, and saddle supports. Subsequently, the FE buckling analysis of the Type C tank has been performed under external pressure following International Gas Containment (IGC) code requirements. Meanwhile, the assessment is also performed for yielding and buckling strength evaluation of the cylindrical LNG tank according to the PD 5500 unfired fusion welded pressure vessels code. Finally, a complete procedure for assessing the structural strength of 500 CBM LNG cargo tank, saddle support and hull structures have been provided.
Teguh Rahayu,Y.Andi Trisyono,Witjaksono 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.3
The Asian corn borer, Ostrinia furnacalis (Guenée) (Lepidoptera: Crambidae) is an economically important pest of corn. Finding simple, cheap, and suitable rearing techniques of O. furnacalis is an urgent need to support research for management of this insect. This research aimed to determine the suitability of a read bean and rice branbased artificial diet used for mass rearing of this insect since 2009. The tested artificial diet was compared with the natural diet (sweet corn kernel) and each diet was tested in individual rearing method (one larva in each vial). The criteria used to justify the quality of diet and mass rearing procedure were based on the fitness of O. furnacalis. The degree of fitness was based on life history, growth, and development. In general, the fitness parameteres observed from O. furnacalis reared in the artificial diet at 25.7 ± 1.6 °C with 57.7 ± 3.8% RH, and L12:D12 were similar than those in the natural diet. Therefore, the existing artificial diet and rearing procedure were considered suitable and qualified for O. furnacalis. It is important to periodically check the laboratory colony to ensure that they have similar fitness to those found in the natural population.