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The aim of the present study was to examine whether Metacognitive Intervention (MI) in their first language (L1) had any significant effect on English as a Foreign Language (EFL) learners’ Working Memory (WM) in listening comprehension when they received it. In addition, it measured whether gender had any effect on EFL learners’ listening comprehension when they receive MI through L1. To this end, 60 Iranian EFL learners were selected through a Quick Placement Test and were assigned into two male and female experimental groups. These experimental groups received an eight-week intervention program, designed by the pedagogical cycle proposed by Goh and Vandergrift (2022). After the metacognitive intervention in L1, two posttests including a working memory capacity test and a listening comprehension test were administered. The findings indicated that there was a significant effect on EFL learners’ working memory in listening comprehension after they received MI in L1. It was also found that gender had a significant effect on the EFL learners’ working memory and listening comprehension when they receive MI in L1. The findings might contribute to assisting language instructors to adopt strategy-based approaches to teaching listening. Furthermore, curriculum designers and ELT policymakers might consider metacognitive intervention as an effective teaching approach and add it to EFL learners’ curriculum.

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Knowing how to think about the language learning process is conducive to effective learning especially in the case of grammar structures. Metacognition, a concept derived from cognitive psychology, can assist learners in this case. With regard to young adolescents at lower proficiency levels, there is a long-standing debate on whether to use L1 for teaching metacognitive strategies since learners might not be efficient enough in terms of understanding the concept of metacognition. Therefore, this small-scale experimental study focused on the effect of grammar instruction through the metacognitive intervention delivered in L1 on the EFL pre-intermediate learners' grammatical performance in English and investigated their attitudes towards grammar instruction delivered in L1. To fulfill these purposes, a homogenous group of 20 language learners was randomly divided into an experimental group (n =10), which received grammar instruction through the metacognitive intervention delivered in L1, and a control group (n =10), which received the instruction only in English without grammar instruction through the metacognitive intervention delivered in L1. The results of the independent samples t-test indicated that the experimental group did not outperform the control group in terms of all four English grammar points, namely present perfect, simple past tense, comparative and superlative adjectives, and past progressive. In addition, the findings obtained from the five-point Likert scale questionnaire which was distributed among the learners suggested that they had positive attitudes towards the use of L1 (Persian) in teaching English grammar. We argue that low working memory capacity, overreliance on translation, and less-cognitively activated L2 processes may account for the low performance of the experimental group learners in the grammar tests. The implication is that the L1 use in an L2 classroom can be helpful in teaching L2 grammar through the metacognitive intervention, but future studies need to examine how and to what extent L1 should be used to yield more effective results in the case of lower-proficiency learners in an EFL context.
 

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Lateral jet control systems are being considered as attractive alternatives to conventional control systems in recent years. In present study which is divided in two parts, the effects of lateral jet interaction with supersonic cross flow on aerodynamic behavior of a standard projectile at zero angle of attack has been studied. In the first part, results of the effects of parameters such as jet location, Mach number and nozzle type on pressure coefficient, drag coefficient, drag force and pressure distribution on the fins is presented and analyzed. In the second part, longitudinal static and dynamic stability coefficients of the projectile in presence of lateral jet has been achieved and evaluated according to the mentioned parameters. According to the results, jet location is the most effective parameter. In the first part, the pressure distribution on the fins is much dependent on jet location. Effect of Mach number on pressure coefficient, drag force and drag coefficient is also significant. Besides change of the pressure distribution on the fins comes more into sight at the final locations by variation of Mach number. In the second part, lateral jet effect leads to decreasing longitudinal static stability. Increasing the Mach number is also results in decreasing longitudinal dynamic stability and jet displacement make nonlinear behavior over pitch damping moment coefficient, therefore choosing proper jet location is depend on desired parameters of designer. According to the results, effect of nozzle type has been insignificant for all cases.

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This study sets out to explore English as foreign language (EFL) and Iranian teachers' attitudes ‎towards the implementation of MALL instruction. For that matter, a mixed-methods design, ‎including questionnaires, structured interviews and observation were employed. A total of 87 ‎EFL teachers participated in the questionnaire, which was the quantitative phase of the study. ‎In addition, 10 EFL teachers were interviewed and their classes were observed for the ‎qualitative phase of the study. The participant EFL teachers have been teaching at a number of ‎universities and language-teaching institutions in Mazandaran. One-sample t-test was used to ‎analyze the questionnaire data and the results suggested that the Iranian EFL teachers adopted ‎moderately positive attitudes towards the implementation of MALL instruction, but the ‎observation data indicated that most teachers preferred traditional ways of teaching English in ‎the EFL context. At the same time, the interview data revealed that the implementation of ‎MALL instruction in Iran is challenging due to a number of perceived barriers and obstacles. ‎The most considerable perceived challenges to the implementation of MALL instruction ‎comprise lack of online facilities and resources, lack of interaction in online instruction, and ‎teachers’ limited knowledge of online instruction. The findings provide crucial insights into ‎teachers’ attitudes towards integrating MALL into their EFL classroom instruction in Iran. ‎