Abstract:This study aims to analyze the difference of learning outcomes between students who were taught physics using guided inquiry-based learning model experiments with real and virtual laboratory learning model compare to Instruction Direct Instruction (DI).This study was a quasi-experimental. The study population was students of class XI-IPA Methodist 1 High School Medan of the school year 2012/2013. Sampling technique using a cluster random sampling consisting of two classes with a total sample of 76 students. The data analysis performed by Two Way Anova. The results obtained that there are significant difference between the results of studying physics students taught using guided inquiry learning model based on real and virtual laboratory experimentation and students taught using direct learning model. It can be concluded that the Guided Inquiry learning model based on real and virtual laboratory experiments is better than direct instructional model in improving student learning outcomes physics. There is a significant interaction between guided inquiry learning model based on real and virtual laboratory experiments and direct instructional model regarding the level of activity of the physics students' learning outcomes.
Advanced power generation will be operated at higher temperatures and pressure to achieve higher efficiency and reduce CO2 emission. This may significantly impact the use of carbon steel that previously has been used in boiler fabrication. In this study, a flame spraying technique was applied to develop a highly resistant coating of MoSi2 added FeCrAlTiY on ST41 steel to improve its oxidation resistance. Four variations of MoSi2 concentration as 0, 10, 20 and 30 in mass% were prepared to investigate the effect of its addition on the cyclic oxidation resistance of FeCrAlTiY coating at 700 o C for 8 cycles. The phase composition and microstructure of the coating before and after the oxidation test were analyzed using XRD and SEM, respectively. While the element distribution along the coating was characterized using an EDX. According to the results, partially and fully melted particles, oxides and pores are present in the coatings. It becomes more porous with the increase of MoSi2 concentration. The oxidation test results indicate that the FeCrAlTiY with 10 mass% MoSi2 addition exhibits the lowest mass gain (0.217 mg/mm 2 ) compared to that of MoSi2free coating (0.261 mg/mm 2 ) and FeCrAlTiY coating with 20 and 30 mass% MoSi2 (0.297 and 0.308 mg/mm 2 , respectively). As the MoSi2 concentration increases, its addition leads to the deterioration of FeCrAlTiY coating oxidation resistance. The results suggest that FeCrAlTiY-10 mass% MoSi2 is the most resistant coating to cyclic oxidation at 700 o C in air and can be applied as a protective coating in advanced power generation.
Penelitian ini bertujuan untuk mengembangkan media pembelajaran interaktif dengan menggunakan LMS Moodle untuk membantu meningkatkan kemampuan kognitif mahasiswa selama pembelajaran berbasis Blanded Learning. Metode penelitian yang digunakan dalam penelitian ini yaitu Research and Development. Prosedur dalam penelitian adalah tahap identifikasi masalah, pengumpulan data, desain, validasi media, revisi media, validasi materi, revisi materi, uji coba siswa, revisi produk, dan produk akhir. Berdasarkan hasil analisis dari angket kebutuhan mahasiswa yang dilakukan mendapatkan persentase sebesar 85,45% dalam kategori sangat membutuhkan media pembelajaran berbasis moodle tujuannya agar pembelajaran lebih fleksibel, bisa dibuka/ diakses setiap saat, terhubung internet (online). Selain itu di dalamanya terdapat materi dan assignment, chatting, forum diskusi, dan detail disertai visualisasi. Dicantumkan juga kompetensi yang harus dikuasai dan tujuan pembelajaran, pengunggahan materi atau tugas di moodle dalam berbagai format, serta ada evaluasi dalam media pembelajaran serta pemberian umpan balik yang yang dapat memperlihatkan skor/nilai untuk mengukur kemampuan kognitif mahasiswa. Penilaian yang didapatkan dari ahli materi sebesar 95% dan ahli media sebesar 94% dalam kategori sangat valid yang berarti sangat layak untuk digunakan dalam pembelajaran. Kemudian berdasarkan uji persepsi mahasiswa sebesar 93,23% dalam kategori sangat valid yang berarti sangat layak digunakan dalam pembelajaran.
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