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All Journal Jurnal Akademika Kimia Linear : Jurnal Ilmu Pendidikan
Hafid, Inda Widiarti
Universitas Tadulako
Chemistry Education Languange, Linguistic, Communication & Media Mathematics Other

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Analisis Kadar Kalsium (Ca) dan Fosforus (P) pada Limbah Sisik dan Sirip Ikan Mujair (Oreochromis mossambicus) dari Danau Lindu Sulawesi Tengah Tiwow, Vanny M. A.; Hafid, Inda Widiarti; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (379.71 KB)

Abstract

The most fish species live in lake Lindu is mujair fish with the average number production of 1080 per day. The scales and fins of mujair fish are the biggest waste that is produced from the processing of this fish and they were just thrown away, which can pollute the environment. The aim of this study is to analyze the level of calcium (Ca) and phosphorus (P) on waste of mujair fish (scales and fins) from the lake Lindu as a basic ingredient of a liquid organic fertilizer. Samples of the scales and fins were taken from a seller mujair fish at Touwa street Palu. To analyze the level of calcium (Ca) and phosphorus (P) from the scales and fins was used a Spectrodirect. Based on the results of the analysis, the average of level of calcium (Ca) in the scales and fins was 4.98 mg/L and 33.33 mg/L, while the average of level of phosphorus (P) was 73.33 mg/L and 145.33 mg/L. The average concentration of dry weight of Ca in samples of the scales was 3,32 mg/kg and the fins was 22,22 mg/kg. The average concentration of the dry weight of P in samples of the scales was 48,88 mg/kg and the fins was 96,88 mg/kg. The results of this analysis showed that the highest concentration of calcium (Ca) and phosphorus (P) was in the fins of mujair fish.
Efektivitas Model Pembelajaran REACT Berbasis Contextual Teaching and Learning Terhadap Kemampuan Pemahaman Konsep Matematis Siswa Pada Materi Relasi dan Fungsi Suyantana, I Nyoman; Hafid, Inda Widiarti; Windi; Wibowo, Edy
Linear : Jurnal Ilmu Pendidikan Vol. 8 No. 2 (2024): Linear : Jurnal Ilmu Pendidikan
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Tompotika Luwuk

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53090/j.linear.v8i2.753

Abstract

Penelitian ini bertujuan untuk mengetahui keefektifan model pembelajaran REACT berbasis pendekatan Contextuall Teaching and Learning (CTL) dalam pemahamani konsep matematis siswa pada materi relasi dan fungsi. Jenis penelitian yang digunakan adalah studi pre-eksperimental dimana peneliti bertindak sebagai guru dalam proses pembelajaran. Subjek penelitian adalah siswa kelas VIIIA. Indikator yang digunakan meliputi: kemampuan menyatakan ulang konsep, memberikan suatu contoh dan non contoh, dan menerapkan konsep dalam pemecahan masalah. Dari hasil penelitian menunjukkan rata-rata nilai siswa adalah 85,43, melebihi 75, dan nilai t-hitung sebesar 4,319 lebih besar dari t-tabel 1,703. Sehingga hipotesis alternatif diterima dan hipotesis nol ditolak. Dengan demikian, model pembelajaran REACT berbasis pendekatan Contextuall Teachiing and Learning (CTL) efektif terhadap kemampuan pemahaman  konsep  matematis  pada  materi  relasi dan fungsi di kelas VIII SMP Negeri 1 Mamosalato.
Co-Authors Agustin Tiwow Edy Wibowo I Nyoman Suyantana Salsabila, Unik Hanifah Windi