Penelitian ini bertujuan menganalisis pengaruh pembelajaran ADI terhadap kemampuan argumentasi IPA siswa. Metode penelitian yang digunakan quasi experiment, dan sampel penelitian ialah siswa kelas VIII yang terdiri dari 27 siswa diperlakukan pembelajaran ADI dikategorikan kelas eksperimen sedangkan 30 siswa yang diperlakukan pembelajaran konvensional dikategorikan kelas kontrol. Tes esai argumentasi gelombang digunakan sebagai instrumen pengumpulan data kemampuan argumentasi IPA siswa yang diberikan pada pretest dan posttest kepada kelas eksperimen dan kontrol. Teknik analisis data dalam penelitian yaitu analisis statistik inferensial dengan memakai uji t. Diperoleh hasil nilai Sig.(2-tailed) < (0,000<0,05) dan nilai thitung diperoleh 3,965, nilai ttabel =1,673. Oleh karena itu jika dikaitkan pada kriteria analisis hipotesis, maka thitung > ttabel (3,965> 1,673) sehingga cukup bukti untuk menyatakan Ho ditolak dan Ha diterima. Ini artinya bahwa Argumentasi Driven Inquiry (ADI) memiliki pengaruh yang signifikan terhadap kemampuan argumentasi IPA Siswa SMP. Hasil Level argumentasi mengalami peningkatan pada kelas eksperimen mencapai level 4, sedangkan kelas kontrol dominan level 1 dan 2 yang berada pada diatas 25%. Pembelajaran ADI dengan penguatan praktikum dapat memberi pengaruh terhadap kemampuan keterampilan praktikum siswa dalam hal investigasi. Dalam pengambilan data tidak bisa dilakukan satu kali melainkan minimal lima kali pengambilan data.
This action research aims to describe the understanding of students' science concepts and describe the teacher's ability to manage learning on the actual problems of learning in the classroom by applying problem-based learning models. The research subjects were students of class VII-4 totaling 44 people and 1 science teacher. This classroom action research is carried out in two cycles, each of which consists of the stages of planning, implementing actions, observation, and reflection. The results showed that the ability of students to understand the concept in the first cycle was 59.09%, and in the second cycle there was an increase with a percentage of 86.36%. While the ability of teachers in the first cycle the average score of 3.1 and in the second cycle there was an improvement in learning practices so that an increase in the average score (3.8). Keywods: concept understanding, management of learning, problem based learning
Fe3O4 nanoparticles based iron sand from Maluku Utara have been successfully synthesized by co-precipitation methods with varying of the synthesis temperature by 50oC, 60oC and 70oC. The crystal structures and magnetic properties were characterized using X-ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM). The XRD showed that the Fe3O4 samples have a single phase invers spinel cubic structure. The Crystalization of the temperature 70oC is better than 50oC and 60oC, with the intensity peak index of 311 of 42.688 a.u, whereas at the temperature of 60oC and 50 oC are 25.731 a.u and 22.719 a.u, respectively. There’s no increase in crystallite size with increasing synthesis temperature, with each sizes 23.047 nm, 24.043 nm and 16.041 nm respectively. The VSM showed that the Fe3O4 samplesare soft-ferrimagnetic. The Mr and Mmax are higher at 70oC than 60 oC and 50oC by 3,785 emu/gr 20,288 emu/gr (70oC), 2,432 emu/gr 14,713 emu/gr (60oC), 1.473 emu/gr 12.519 emu/gr (50oC). The coercivity Hc at 70oC and 60oC relatively identical at 0.011 T, whereas at 50oC Hc is 0.012 T. The nanoparticles that are synthesized at 700C are selected for mercury removal due to their stable crystallinity and good magnetic properties. The nanoparticles were able to remove mercury with an adsorption capacity 0,45 mg/g and easy to separate it from the solution.
-The effect of synthesis parameter on crystal structure and magnetic properties of Ni0.5Zn0.5Fe2O4 magnetic nanoparticles A Rifianto, J Widakdo, N Istikhomah et al. For NaOH concentration variation, the maximum magnetization of the sample increased from 10.4 emu/g to 11.6 emu/g with increasing ferrite content. Meanwhile, the maximum magnetization increased from 7.9 to 15.7 emu/g for samples with various synthesis temperature. The highest coercivity of 68.5 Oe was attained for a sample of 6 M NaOH under 90 o C. The highest magnetization of 15.7 emu/g was achieved for a sample of 1.5 M NaOH under 120 o C caused by the maximum crystallinity of sample.
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