Ira Purnama
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PENGARUH PENERAPAN METODE KOOPERATIF TIPE PROBING PROMTING TERHADAP PEMAHAMAN KONSEP MATEMATIS SISWA KELAS VIII SMPN 1 RAO SELATAN TAHUN PELAJARAN 2012/2013 Purnama, Ira; Rismen, Sefna; Husna, Husna
Pendidikan Matematika Vol 2, No 1 (2013): Jurnal Mahasiswa Prodi Pendidikan Matematika
Publisher : STKIP PGRI Sumbar

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Abstract

The background of this research is the comprehension of math concepts class VIII SMPN1 South Rao is still low. This study aims to determine whether students comprehension of mathematical concepts with the application of cooperative methods Probing promting better than students comprehension of mathematical concepts with conventional teaching class VIII SMPN1 Rao Selatan.Jenis this research is experimental research design Randomized Only Control Group Design. The population in this study were all eighth grade students enrolled in the school year 2012/2013. The sampling technique was randomly selected as the class VIII2 VIII1 experimental class and the control class. The instrument used in this study is the final test in the form of essays with a reliability test was 0.89. The data analisys which ttest = 1.74 is greather than ttabel = 1.654it was concluded that the students comprehension of mathematical concepts that apply cooperative learning methods Probing promting better than conventional learning in class VIII SMPN1 South Rao.
THE STUDY OF PINEAPPLE PEEL (ANANAS COMOSUS L.) WASTE BASED-ELECTROLYTE MEDIUM: A SIMPLE EXPERIMENT DESIGN FOR THE STUDENTS Firdaus, Irvan Maulana; Silvia, Rosiana Dewi; Amin, Ahmad Faqih; Tsaqifa, Rajwa Vourza; Purnama, Ira; Febiyanto, Febiyanto
Walisongo Journal of Chemistry Vol 2, No 2 (2019): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (762.502 KB) | DOI: 10.21580/wjc.v2i2.6029

Abstract

To promote the student curiosity and understanding in the electrolyte medium was carried out using home-made Volta cell. The electrode materials were iron and carbon for anode (-) and cathode (+), respectively. The experiment was designed by two models that were single-chamber (SC) and three series-packed chambers (3-SCs), respectively. Electrolyte properties could be investigated in pineapple peel (Ananas comosus L.)-based electrolyte medium during the operating time of 8 hours, respectively. The measured-voltage of 2.63 and 2.60 of the 3-SCs system could turn on the LED lamp. However, in this study, the decrease of voltage and current were due to the oxidation process of the pineapple peel-based medium under air, room temperature, and normal pressure during the long-operating time of the experiment. Finally, this research expected to provide additional valuable experience and knowledge as same as to facilitate in information delivering to the students in understanding the electrolyte medium from the waste or natural sources.