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All Journal TIN: TERAPAN INFORMATIKA NUSANTARA Indonesian Science Education Journal (ISEJ)
Putriani, Deka
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Penurunan Kandungan Zat Besi Dalam Air Sumur Galian dengan Menggunakan Metode Aerasi Putriani, Deka; Afliansyah, Eddwin Pratama; Karsina, Melan; Walid, Ahmad
TIN: Terapan Informatika Nusantara Vol 1 No 3 (2020): TIN: Agustus 2020
Publisher : Forum Kerjasama Pendidikan Tinggi (FKPT)

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The concentration of manganese in natural water systems is generally less than 0.1 mg / l. If it exceeds 1 mg / l then it needs water treatment. Dug well water in Kumai Hilir Village, Central Kalimantan, has a Mn content of 2.02 mg / l, exceeding the quality standard based on the Minister of Health Decree No. 907 / Menkes / VII / SK / 2002. The research problem is how to reduce Mn levels in dug well water using a cascade with aeration process. The purpose of this study was to reduce the Mn level in dug well water by aeration process and to determine the effectiveness of the cascade aerator and bubble aerator in reducing Mn levels in dug well water. The research method is Quasy Experiment with Pre and Post Test Design. The research sample was taken using a grap sampling technique, the aeration process was carried out in one of the residents' houses and the Mn level examination in the laboratory. The results showed that the use of a cascade aerator gave better results in reducing the Mn content of dug well water by an average of 0.02 mg / l, which was in accordance with the quality standard with an effectiveness of 98.74%. Bubble aerators can reduce the Mn content of dug well water by an average of 0.43 mg / l, and 76.47% effectiveness. This result is not in accordance with the quality standard according to the Kepmenkes No 907 / Menkes / VII / SK / 2002, which is 0.1 mg / l. The conclusion of this research is the cascade aerator is more effective in reducing the Mn content of dug well water
Development of Assessment to Measure Creative Thinking Skills of Junior High School Students on the Topic of Chemicals in Daily Life Putriani, Deka; Kusumah, Raden Gamal Tamrin; Sukarno, Sukarno
ISEJ : Indonesian Science Education Journal Vol. 4 No. 1 (2023): January
Publisher : Yayasan Darussalam Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62159/isej.v4i1.365

Abstract

This study aims to develop an assessment instrument to measure junior high school students’ creative thinking skills in learning about chemical materials in daily life. The research employed the Borg and Gall research and development (R&D) model, adapted into eight stages: needs analysis, data collection, product design, expert validation, design revision, small-scale trial, product revision, and implementation trial. The study was limited to the small-scale trial phase. Validation instruments consisted of questionnaires administered to experts in assessment, subject matter, and language, as well as to one science teacher and 10 seventh-grade students. Data were analyzed using descriptive statistics by calculating the percentage of achievement in each component. Results indicated high validity: 87.69% (assessment expert), 95.5% (language expert), and 82% (material expert), categorized as “very feasible.” Student responses also showed high acceptance, ranging from 72% to 90% across components. These findings confirm that the developed assessment instrument is valid and feasible to be used as a learning tool in science education, with potential to enhance creative thinking in junior high school students.
Co-Authors Afliansyah, Eddwin Pratama Karsina, Melan Kusumah, Raden Gamal Tamrin M. Sukarno Walid, Ahmad