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All Journal Jurnal Biofiskim: Pendidikan dan Pembelajaran IPA Makara Journal of Science
Ramadhan, L.O.A.N.
Unknown Affiliation
Computer Science & IT Education Languange, Linguistic, Communication & Media Library & Information Science Social Sciences

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KEPRAKTISAN PENGEMBANGAN PERANGKAT PEMEBELAJARAN MENGGUNAKAN PETA KONSEP UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR KRITIS SISWA Wildana, Putri; Harimu, La; Ramadhan, L.O.A.N.
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Publisher : Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (354.414 KB) | DOI: 10.33772/biofiskim.v3i2.18265

Abstract

Abstrak. Tujuan penelitian ini adalah untuk menganalisis kepraktisan penerapan pengembangan perangkat pembelajaran menggunakan peta konsep dalam kemampuan berpikir kritis siswa SMA. Sampel penelitian adalah siswa kelas XI IPA-5 SMA Negeri 2 Kendari yang dilakukan secara purposive sampling. Jenis data dalam penelitian adalah data primer, yang merupakan hasil pengumpulan secara langsung sesuai obyek penelitian dengan mengumpulkan data tentang unsur kepraktisan terdiri keterlaksanaan pembelajaran, kemampuan guru mengelola pembelajaran, dan respon guru terhadap pembelajaran yang telah dikembangkan dan divalidasi.  Data dianalisis secara deskriptif kuantitatif. Hasil penelitian diperoleh bahwa nilai rata-rata total kualitas keterlaksanaan pembelajaran sebesar 1,68 dengan kategori terlaksana seluruhnya, nilai rata-rata total kemampuan guru mengelola pembelajaran sebesar 3,96 dengan kategori baik dan nilai rata-rata total respon guru terhadap pembelajaran sebesar 3,93 dengan kategori praktis dan tidak revisi. Ketiga instrumen yang digunakan untuk mengukur tingkat kepraktisan perangkat pembelajaran yang telah dikembangkan memenuhi kriteria kepraktisan. Kata Kunci: kepraktisan, peta konsep, berpikir kritis
Synthesis and Characterization of Chitosan-Polyvinyl Alcohol-Fe2O3 Composite Membrane for DMFC Application Permana, Dian; Ilimu, Edi; Faariu, Nur Mala; Setyawati, Arini; Kadidae, La Ode; Ramadhan, L.O.A.N.
Makara Journal of Science Vol. 24, No. 1
Publisher : UI Scholars Hub

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Abstract

This study investigates the utilization of different compositions of Fe2O3 and polyvinyl alcohol (PVA) to modify chitosan in order to prepare a composite membrane. The membranes were synthesized using the phase inversion method and extensively characterized by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), mechanical properties analysis, and water uptake analysis, whereby SEM was used to confirm the morphology of the composite membranes. Different electrochemical properties such as ion exchange capacity, proton conductivity, and methanol permeability of these membranes were also measured. The results showed that increasing the PVA mass improved the water uptake, ion exchange capacity (IEC), and proton conductivity because the PVA addition increased the hydrophilicity of the membrane; thus, the pore surface on the membrane was more open, which also caused higher membrane permeability. However, the methanol permeability values of all composite membranes were lower than that of Nafion. The highest IEC and proton conductivity were obtained for the CS-PVA-H3070 membrane, with values of 4.300 meq/g and 6.71 × 10−2 S·cm−1, respectively. The mechanical strength of these membranes showed that the PVA addition increased the elongation break and decreased the tensile strength of the membrane. The results imply that the chitosan membrane modified with PVA and Fe¬2O3 has a potential for DMFC applications.
Co-Authors Dian Permana Faariu, Nur Mala Ilimu, Edi La Harimu La Ode Kadidae, La Ode Setyawati, Arini Wildana, Putri