Asian Journal of Natural Sciences

Analysis of Constraints and Solutions in Implementing the Project Based Learning (PJBL) Model in Biology Learning in Class XI Binjai State 1 High School

2024-06-20T02:47:35+00:00

This study aims to identify solutions for challenges encountered in biology education, particularly regarding the limitations of the PjBL model and student misconceptions. The research methodology involved interviews with two biology teachers to gather data on their experiences with implementing the PjBL model. The findings indicate that student misunderstandings stem from a lack of creativity and engagement in learning, hindering their ability to comprehend, absorb, and respond to educational content and challenges. To address this, educators should design learning experiences that motivate students to be active, collaborate in groups, engage directly with learning, and encounter authentic learning situations to enhance meaning. Additionally, not all content can be effectively covered using the PjBL model. To address this challenge, educators should experiment with various teaching models to identify the most suitable approach for each topic. The PjBL model offers significant opportunities for students to explore their creativity, with teachers serving as facilitators to guide student activities during project implementation. Project-based learning can serve as a conduit for students to develop 21st-century skills by bridging the gap between abstract knowledge and practical application.

Utilization of Nipah Fruit Shell Activated Carbon (Nypa Fruticans) with Hcl Activator as a Media for Digging Well Water Filtration

2024-07-05T02:13:37+00:00

Dug well water located in Kualuh Leidong District, North Labuhanbatu Regency can’t be directly used for hygiene and sanitation purposes, this is due to water quality that does not meet clean water standards. The purpose of this study was to determine the characteristics of nipah shell activated carbon (nypa fruticans) activated with HCl concentration of 2 M, silica sand and zeolite as water filter media, water quality of dug wells in the study area before and after filtration, and optimal filtration design in improving water quality between filtration designs I (activated carbon: silica sand: zeolite), filtration design II (activated carbon: zeolite: silica sand) and filtration design III (zeolite: silica sand: activated carbon). From the results of the physical test of nipah shell activated carbon (nypa fruticans) shows that all parameters tested have met good activated carbon standards based on SNI 06-3730-1995, From the results of water quality testing using physical and chemical parameters, there is 2 physical parameter and 1 chemical parameter that does not meet the standard, namely total dissolve solid (TDS), turbidity and manganese (Mn) levels. From the results of the percentage reduction in total dissolve solid (TDS), turbidity and dissolved manganese (Mn) levels, it can be concluded that filtration design I with variations in the location of activated carbon: silica sand: zeolite is the optimal filtration design in improving water quality.

Designing Solar Panel System to Supply Synthesis of Micro-algae Micro-sample Using Lamp and Aerator

2024-07-10T01:17:07+00:00

This research has goal to design a method of micro-algae micro-sample synthesis by using lamp light and aerator sourced on solar panel. This system designed to generate an optimal controlled habitat in the process making micro-algae micro-sample. This system gives a new idea to related habitat variables and qualitative results of micro-algae that synergy to green technology. To create an artificial habitat with lamp light sourced on PV that enough to supply energy belong the synthesis. Solar Energy is produced by the Sunlight is a non-vanishing renewable source of energy which is free from eco-friendly. The highest intensity of sunlight occurs at 10.30-15.30 with the value of the intensity of sunlight is 80.000-122.000 lumen. Temperature of water medium monitored is about 26,4o-28,4oC and biomass is 3 mg/l. Based on this result can find conclusion that solar panel can supply lamp and aerator to support synthesis of micro-algae micro-sample.