Penelitian ini bertujuan untuk mengetahui pengaruh model PBM terhadap hasil belajar fisika pada materi cahaya diSMP Negeri 2 Tambusai. Metode yang digunakan penelitian ini adalah metode eksperimen semu dengan populasi penelitian yaitu siswa kelas VIII di SMP Negeri 2 Tambusai TP. 2020/2021. Teknik sampel Purposive Sampling, diperoleh sampel penelitian kelas eksperimen (VIII1) menggunakan model PBM dan kelas kontrol (VIII2) menggunakan model pembelajaran konvensional. Intrumen yang digunakan adalah tes hasil belajar dengan bentuk pilihan berganda sebanyak 20 soal. Sebelum mendapatkan perlakuan kepada kedua, diperoleh hasil rata-rata skor pretes kelas eksperimen 38,80 dengan standar deviasi 13,87 dan hasil rata-rata skor pretes kelas kontrol 38,20 dengan standar deviasi 11,26. Setelah dilakukan pembelajaran yang berbeda, diperoleh hasil rata-rata skor posttes kelas eksperimen 71,00 dengan standar deviasi 10,90 dan hasil rata-rata skor posttes kelas kontrol 65,80 dengan standar deviasi 9,97. Hasil uji prasyarat data postes menyatakan sampel berdistribusi normal dan homogen. Selanjutnya dilakukan uji t satu pihak (α=0,05) dan uji regresi sederhana. Dari hasil uji t satu pihak maka diperoleh thitung> ttabel (1,761 > 1,677) dengan taraf signifikan 0,042. Dan untuk hasil uji regresi sederhana diperoleh Y = 24,64+0,61X. Pada persamaan tersebut kofisien arah regresi linear (b) = 0,61 menunjukkan bahwa jika aktivitas siswa meningkat sebesar 1 maka akan meningkat hasil belajar siswa akan meningkat sebesar 0,61. Maka disimpulkan ada pengaruh yang signifikan model PBM terhadap hasil belajar fisika kelas VIII SMP Negeri 2.
Learning that occurs in schools certainly has many obstacles and difficulties for students. As a result of online learning that was previously done, many students did not understand the learning material. Learning that occurs and takes place for students in science lessons, especially physics, has been a difficult lesson because of the many formulas and theories that tend to be memorized so that students feel less interested. In physics lessons, experiments are needed to improve students' understanding, so tutoring is carried out after school to overcome students' difficulties using teaching aids with the experimental method. Community service activities with tutoring are carried out at SMP Negeri 1 Tapian Nauli. Props used in electrical circuit material. With props that have been made can help students gain understanding and maximum learning outcomes in the tutoring carried out. The development of this electric circuit aid helps students to practice skills and understanding on series circuits and parallel circuits. The results of this tutoring activity increased student interest and learning outcomes, seen the average value of students before using the electric circuit teaching aid was 34.69 and after using the electric circuit teaching aid 86.57. Based on the N-Gain analysis, it is known that student learning outcomes are categorized as high and the results of the T test (Paired Sample Test) show a significant difference. The electric circuit teaching aids developed are very feasible, practical and effective to use in learning for students.
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.
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