Abstrak – Penelitian ini bertujuan untuk mengetahui pengaruh pembelajaran inkuiri yang dilengkapi dengan penggunaan KIT IPA terhadap Keterampilan Proses Sains (KPS) siswa kelas VII SMPN 1 Tomini. Penelitian ini merupakan penelitian kuantitatif dengan model penelitian eksperimen. Pengambilan sampel dilakukan menggunakan teknik purpossive sampling dengan subyek yang digunakan adalah siswa kelas VII F SMPN 1 Tomini. Siswa yang menjadi subyek penelitian berjumlah 35 orang. Instrumen yang digunakan pada penelitian ini menggunakan tes essai yang terlebih dahulu di validasi dan diuji reliabilitasnya. Selanjutnya data dikumpulkan menggunakan teknik observasi dan di analisis uji normalitasnya, uji homogenitas dan uji –t untuk mengetahui hipotesis yang telah di buat sebelumnya. Hasil penelitian menunjukkan bahwa terjadi peningkatan keterampilan proses sains sebelum dan sesudah diberi perlakuan, sehingga terdapat pengaruh pembelajaran inkuiri menggunakan KIT IPA terhadap keterampilan proses sains siswa kelas VII SMPN 1 Tomini. Skor rata-rata pretest sebesar 11 sedangkan skor rata-rata posttest sebesar 15,68 dengan presentase peningkatan keterampilan proses sains sebesar 54%. Kata Kunci: Pembelajaran Inkuiri; KIT IPA; keterampilan Proses Sains; purpossive sampling
In this study, the mechanical properties and corrosion properties of plasma nitrocarburized 304 stainless steel at various processing times was investigated. Plasma nitrocarburizing was carried out at different processing time durations which varied from 60 min to 300 min at fixed temperature of 500 °C in an atmosphere of 78 vol.% N2, 19 vol.% H2 and 3 vol.% CH4. An Optical microscope and SEM coupled with EDS have been used to characterize the microstructural and the elemental depth profiles in which the thickness of the modified layers is derived. Microindentation method is used for the study of mechanical performance of the nitrocarburized material. Corrosion properties were investigated using potentiostat method in a 1 wt% NaCl solution. The result shows that the microhardness increases to a maximum value of more than two times compared to that of the untreated one. The corrosion performance was found being treatment time duration dependent.
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