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All Journal Mimbar PGSD Undiksha Jurnal Penelitian Pendidikan IPA (JPPIPA) Ruwa Jurai: Jurnal Kesehatan Lingkungan
Kurniasih, Anisa
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Health Professions Materials Science & Nanotechnology Physics Public Health

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PEMANFAATAN AMPAS TEBU SEBAGAI ARANG AKTIF DENGAN AKTIVATOR LARUTAN BELIMBING WULUH (Averrhoa bilimbi L.) Kurniasih, Anisa; Pratiwi, Dina Audia; Amin, Muhammad
Ruwa Jurai: Jurnal Kesehatan Lingkungan Vol. 14 No. 2 (2020)
Publisher : Poltekkes Kemenkes Tanjung Karang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26630/rj.v14i2.2287

Abstract

One of the efforts to utilize bagasse is activated carbon which can be used as an adsorbent for the pharmaceutical industry, foodstuffs, and water purification to remove odors, tastes and colors. So far, the raw materials for making activated carbon use coal and coconut shells, while the activator uses chemicals such as KOH, NaOH, H2SO4, HCl, and others. The manufacture of activated carbon is carried out in three stages, namely the process of dehydration, carbonization, and activation. Bagasse that has been dehydrated for 2 days using sunlight, is carbonized for 1 hour at a temperature of 4500C. Carbon is activated using starfruit extract with a ratio of extract: distilled water, 100%: 0%, 75%: 0%, 50%: 505, 25%: 75%, and the time is varied, namely for 4 hours, 8 hours, 16 hours, and 24 hours.From the research results as much as 4.000 grams of bagasse carbonized to produce 170 grams of carbon. The results of the analysis of the proximate content in bagasse activated carbon have met the Indonesian National Standard (SNI 06–3730–1995), namely the best Total Moisture Content of 2.88%, the best Volatile Matter of 6.88%. The best ash was 3.11%. The best-fixed carbon was 86.30%. The iodine number produced from the bagasse activated carbon is 937.9686 mg / g.The Iodine number has met the requirements of the Indonesian Industry Standard (SII 0258-88), which is more than 750 mg / g, indicating that the activation of activated carbon using starfruit is very reactive. Starfruit can be used as an environmentally friendly activator in making activated carbon.
Cooperative Learning Type Group Investigation on Critical Thinking Ability at PGSD Students Kurniasih, Anisa; Sartono, E. Kus Eddy; Adi, Banu Setyo; Gularso, Dhiniaty
MIMBAR PGSD Undiksha Vol. 12 No. 3 (2024): October
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpgsd.v12i3.80925

Abstract

The minimum skill of students in critical thinking to solve a problem can be an obstacle in teaching and learning processes and development of their intellectual potential. This research aims to analyze how much influence the cooperative learning type group investigation model has on student critical thinking skills in social studies courses. This research uses a quasi-experimental two-group pretest-posttest design with a sample of 63 with 34 students (experimental class) and 29 students (control class). Data were collected through observation method and tests (pre-test and post-test). Data were analysed using quantitative descriptive analysis techniques, while hypothesis testing was conducted using the Wilcoxon method. The results showed that the hypothesis tested via Wilcoxon test was in the control class where the analysis results indicated a significance value of 0.071 in the control group and a significance value of >0.001 in the experimental group. Thus, the result in the experimental class is >0.001 which is >0.05, there is a difference in the group investigation type cooperative learning model on students' critical thinking skills in class A6-23. The results indicated that group investigation, as a cooperative learning model is effective in improving student critical thinking skills.
Problem-Based Learning Model to Increase Students' Science Literacy in Grade V Science Learning on Heat Transfer Topic Susanto, Srinita; Wibowo, Setiawan Edi; Kurniasih, Anisa; Saragih, Vitry Rayani Bethesda; Yuni, Annisyah
Jurnal Penelitian Pendidikan IPA Vol 11 No 4 (2025): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i4.9793

Abstract

This study aims to analyze the influence of the problem-based learning model on students' science literacy in science lessons in class V, especially on heat materials and their transfer. This study focuses on the pre-experimental method using a one-group pretest-posttest design research design. Data collection is carried out by providing tests consisting of pretest and posttest. Sampling technique through purposive sampling. The research sample amounted to 25 students. The data analysis technique was carried out by N­-Gain and T-paired sample t-test. Based on the calculation of the hypothesis test using the t-test, it indicates that there is a significant difference between the pretest and the posttest. This can be seen from the significance value (p) = 0.000 (p < 0.05) so that the H0 hypothesis is rejected. This illustrates that the implementation of the problem-based learning model has a positive influence on students' science literacy in science lessons. Furthermore, based on the average N-Gain value of 0.5241 located in the medium group, this result indicates that the implementation of problem-based learning model is effective in improving students' science literacy in science lessons. Thus, it is concluded that the problem-based learning model has positive influence on students' science literacy. This study will contribute to the development of effective learning strategies to optimize students' science literacy and provide recommendations for educators in the application of the problem-based learning model in elementary schools.
Co-Authors Banu Setyo Adi Dhiniaty Gularso Kus Eddy Sartono Muhammad Amin Pratiwi, Dina Audia Saragih, Vitry Rayani Bethesda Setiawan Edi Wibowo Susanto, Srinita Yuni, Annisyah