Jurnal Ilmu Pendidikan Indonesia

USE OF BENTONITE-CHITOSAN MIXTURE AS AN AMMONIUM SULFATE CARRIER IN MANUFACTURING SLOW RELEASE FERTILIZER

2023-12-19T02:13:18+00:00

Nitrogen is a nutrient that is needed for the process plant growth, but nitrogen is easily carried away by water and evaporates, it causes farmers to fertilize excessively. This cause environmental pollution. The aim of this research is to make slow release fertilizer (SRF) with a bentonite-chitosan-ammonium sulfate formula to increase fertilization efficiency. Mixing was using the liquid-liquid method where 50 mL of 20% (NH4)SO4 was mixed with 20% bentonite-1% chitosan in a ratio of 10:0; 10:20; 20:20; 30:20; 40:20; 50:20. The highest total nitrogen content was obtained in SRF with a bentonite-chitosan ratio of 0:50 (3.94%) which was tested using the Kjeldahl method. Comparison of release tests on SRF and pure fertilizer was carried out every day for 6 days, SRF increased slowly, namely from 0.07%; 0.18%; 0.27%; 0.6%; 0.42%; 0.5%while in 20% (NH4)SO4 fertilizer there was a release of 0.07%; 0.18%; 0.27%; 0.6%; 0.42%; 0.5%%. Nitrogen release in SRF is slower than in ammonium sulfate fertilizer

THE EFFECT OF STAD TYPE COOPERATIVE LEARNING MODEL ASSITED BY VIDEO MEDIA ON STUDENT LEARNING OUTCOMES ON REACTION RATE MATERIAL IN HIGH SCHOOL

2024-01-08T10:27:20+00:00

: This study aims to determine the effect of the Stad Type Cooperative learning model assisted by video media on student learning outcomes on reaction rate material in high school. This research was conducted with a quasi-experimental method of two group pretes-posttes design. The sampling technique used random sampling technique. The research sample consisted of two classes, namely XI-IPA1 and XI-IPA2 classes, each consisting of 31 students. Class XI-IPA1 was the experimental class taught using the stad type cooperative learning model. While class XI-IPA2 was the control class taught with conventional learning. The research instruments used were non-test and test. The test instrument was used to determine the knowledge of students in the cognitive domain, as many as 20 items with four choices that have been tested for feasibility. The non-test instrument used is a questionnaire to measure student learning independence. The pretest and post-test data of student learning outcomes in the experimental class were 40.5 and 84.5 while the control class data were 40.7 and 67.5. The percentage increase in n-Gain of student learning outcomes in the experimental class was 75% with a high category and the control class was 47% respectively with a medium category. Meanwhile, the percentage increase in N-gain of student learning independence in the experimental and control classes was 71% and 51% in the high and medium categories. There is a positive correlation between student learning independence and student learning outcomes, namely 0.635 with a moderate category.

THE INFLUENCE OF DIGITAL LITERACY PROBLEM BASED LEARNING MODELS ON STUDENT LEARNING OUTCOMES

2024-02-19T12:18:28+00:00

Higher education in the digital age demands the integration of digital literacy in a learning approach to prepare students to face the complexity of job market demands. In this context, Problem Based Learning (PBL) models offer a potentially effective approach in promoting deep understanding and critical thinking skills. Problem Based Learning (PBL) model, the focus of learning is on the chosen problem so that students not only learn concepts related to the problem that is the center of attention but also scientific methods to solve the problem. The research was carried out at HKBP Nommensen University located on Jl. Sangnawaluh No.4, Siopat Suhu, East Siantar District, Pematangsiantar City, North Sumatra, Zip Code 21136. The research period starts in January 2024 – July 2024 at the Biology Education Study Program at HKBP Nommensen Pematangsiantar University. The study population is all students of the Biology Education study program at HKBP Nommensen Pematangsiantar University. The type of research used in this study is a type of quasi-experimental research, which is research intended to determine whether or not there is an influence of the treatment given to students as research subjects. In this study, researchers used a pretest-postest control group design which aims to determine the learning outcomes of students before and after being treated. Based on the results of data analysis and hypothesis testing, there is a significant influence by using the Digital Literacy-based Problem Based Learning Model on Student Learning Outcomes and the Digital Literacy-based Problem Based Learning Model can be developed into an alternative learning model in lectures

SYNTHESIS AND CHARACTERIZATION OF MONTMORILLONITE/TiO2 COMPOSITES AS A PHOTOCATALYST IN REDUCING BOD AND COD OF DOMESTIC WASTEWATER

2022-11-19T04:27:03+00:00

The development of hotels in Bali is increasing every year, this is directly proportional to the number of tourists and the waste generated. Hotel liquid waste has the potential to pollute the environment if there is no pre-disposal treatment. This study aims to obtain the best MMT/TiO₂ composite that acts as an adsorbent and photocatalytic in reducing BOD (Biological Oxygen Demand) and COD (Chemical Oxygen Demand) levels of domestic wastewater. Composite synthesis was carried out by combining the top-down method, ball milling, and sonication. The ball milling method is used to produce montmorillonite, which has a smaller size, with a ball mass to sample mass ratio of 2:1 at a speed of 250 rpm. Variations in milling times of 0, 2, 4, and 6 hours were applied to determine the effect of milling time. The sonication method was used to obtain a smaller TiO₂ particle size by exposing it to ultrasonic waves for 30 minutes. Calsination of the composite was carried out at a temperature of 400 Â°C. The results of composite characterization using the PSA (Particle Size Analyzer) showed that the composite did not meet the nanoparticle requirements because it had a particle size > 100 nm with a PI value > 0.5, which was still classified as polydispersity. NMT 6 has the best PI value of 0.65, which is then used to determine the optimum composite time to reduce BOD and COD levels. The optimum irradiation time obtained from composites in degrading waste is 90 minutes, which can reduce BOD levels by 78.53% and COD levels by 69%. The ability of composites NMT-6 to reduce BOD and COD levels is greater than that of montmorillonite and TiO₂.

MANUFACTURING VIRGIN COCONUT OIL (VCO) THROUGH THE SALT METHOD

2023-11-30T11:22:59+00:00

This research aims to determine the effect of adding CaCl₂ salt on the yield results. Old coconuts taken are 12 months old. 12 coconuts are grated to produce 600 kg of grated coconut and then filtered to produce 1200 mL of coconut milk. Add 2 grams, 4 grams and 6 grams of CaCl₂ to each coconut milk and stir for 10 minutes. Coconut milk is heated at 100°C for 120 minutes using a hotplate. Then coconut oil was produced and an organoleptic test was carried out with the results of a typical coconut aroma, clear color and tasteless taste of the coconut oil. Then to produce the best yield it is 23.20% and the optimum water content is 2 grams with a concentration of 0.17%. The higher the CaCl₂ level, the greater the yield of VCO produced and the water content produced will be of good quality. The best quality VCO is VCO that does not use contaminated or old coconut, has a distinctive coconut aroma and fresh taste, does not contain odor or taste. which is unusual and the color is relatively clear and clear. Meanwhile, poor quality VCO means using chemicals or excessive heating during extraction, it doesn't smell fresh or tastes strange, the color is cloudy or too dark and contains additives or other additives that shouldn't be there.

DEVELOPMENT OF A SCIENCE E- MODULE BASED ON LOCAL PAPUAN WISDOM TO INCREASE STUDENTS' INTEREST AND LEARNING OUTCOMES IN THE 5TH GRADE HEAT TRANSFER MATERIAL

2024-03-05T06:20:23+00:00

This research aims to find out how to create, develop and feasibility of science e_modules in improving students’ abilities, interest and learning outcomes. The research method is research and development, the process used to develop and validate educational products carried out in class V of SD Negeri Inpres Perumnas IV Padang Bulan, with sample of 27 students. The research data collection instruments are egibility validator sheet for the lectures, science teacher response sheet, students response sheet, and pretest and postest question sheets. The research result show : 1) making a science e_ module with the stages of analyzing e_module needs, e_module design, and validating. 2) The feasibility of the science e_module developed optained a percentage of 94% with the category very suitable for use as a teaching material. 3) the science e_module is effective in improving students outcomes, obtaining n_gain score which is 0,61 in the medium category.