MENINGKATKAN HASIL BELAJAR SISWA DENGAN MENGGUNAKAN MODEL PROBLEM BASED LEARNINGI (PBL) PADA MATERI TEKANAN ZAT

The Classroom Action Research (CAR) is aimed at improving students learning outcomes by using Problem Based Learning (PBL) model on Substance Pressure material in grade VIIIA of SMP Negeri 1 Dulupi. This Classroom Action Research was carried out from October 2019 to March 2020 in the even semester of 2019-2020 with the number of students who were subject to action as many as 25 people and carried out in 2 cycles. the result of the analysis showed that students learning outcomes from cycle I to cycle II has increased. In cycle I, students’ mastery learning only at 64%, with 16 total students who were completed and 9 students incomplete. After being given action in cycle II, there was an increase to 84%, with 21 total students who were completed and 4 students incomplete. Based on these data, it is concluded that Problem Based Learning (PBL) model can improve students learning outcomes

PURIFICATION OF DUG WELL WATER USING ACTIVATED CARBON MADE FROM SAGO FIBER WASTE

The sago fiber waste is promising as an active carbon material which has a high adsorption in purifying water process. The objective of this research was to make activated carbon from sago fiber waste to be applied for water purification and iron (Fe) adsorption with various of contact time. The carbon activation process uses Phosphoric Acid (H3PO4) and calcined at 800 °C for 2 hours. After drying, then analyzed the water content and ash content. Furthermore, surface morphology testing was carried out using SEM. The application of activated carbon was carried out in dig well water purification and filtering iron (Fe) based on variations in contact time of 10 minutes, 20 minutes, 30 minutes and 40 minutes. Analysis of water content of activated carbon was carried out 3 times with an average value of 3.9662%. Ash content analysis aims to determine the metal oxide content in activated carbon. Analysis of the ash content of activated carbon was carried out 3 times with an average value of 5.3239%. The average value of ash content meets the quality standards of activated carbon SNI 06-3730-1995 where the standard value of ash content for powdered activated carbon is a maximum of 10%. SEM test results show that the surface of the activated carbon is porous but the size is not uniform. The level of Ferrium (Fe) in water that has gone through the purification process using activated carbon. The most effective contact time was obtained, namely 20 minutes and had met the threshold requirements for water turbidity levels according to Minister of Indonesia health. This means that activated carbon from sago fiber is able to adsorb the material contained in water and also very capable in picking up some bad contents of cloudy and polluted water.

DEVELOPMENT OF MECHANICAL ENERGY TEACHING AIDS BASED ON ARDUINO UNO MICROCONTROLLER ASSISTED ULTRASONIC SENSORS AND LOAD CELLS

The study aims to produce a mechanical energy prop by worthy using an Arduino Uno microcontroller assisted by an ultrasonic sensor and a load cell. The research method uses research and development design according to the ADDIE model which consists of 5 stages by analysis, design, development, implementation, and evaluation. The feasibility of mechanical energy props is determined according to experts. The research was carried out in 2021, a limited trial was carried out on students at SMA Negeri 3 Sungai Kakap. Research subjects' responses to the props are also known to use response questionnaires. The validation results of mechanical energy props based on the Arduino Uno microcontroller by two media experts obtained an average score of 95% in the excellent category and by two material expert validators, an average percentage of 97.21% was obtained in the excellent category. The response of research subjects to mechanical energy teaching aids based on the Arduino Uno microcontroller obtained an average score of 87.72% with an excellent category. Overall, mechanical energy teaching aids based on the Arduino Uno microcontroller assisted by an ultrasonic sensor and a load cell have been produced.

SYNTHESIS OF CARBON DOTS (CDS) AND DETERMINATION OF OPTICAL GAP ENERGY WITH TAUC PLOT METHOD

Carbon Dots (CDs) which have been synthesized using the laser ablation method show the presence of UV-Vis absorption in the wavelength range of 303 nm to 333 nm for absorbance and 495 nm to 503 nm for fluorescence. Changes in the time duration 1, 2, 3 hours of CDs resulted in changes in the optical energy gap. The optical energy gap valuesare distinguished by the type of indirect transition (n=2) is 3.40 eV (1 hour), 3.15 eV (2 hour), 2.85 eV (3 hour) and direct transition (n=1/2) is 2.58 eV (1 hour), 2.31 eV (2 hour), 1.70 eV (1 hour).

PROFILE OF STUDENTS ANALYTICAL THINKING SKILLS IN LEARNING STYLE FOR COMPLETING SUBSTANCE PRESSURE PROBLEMS

The skill to think analytically is an important skill for students to have, where the skill to think analytically helps students solve problems in science lessons that require an analytical skill to solve them. The research method is qualitative with a naturalistic design. This research was conducted at some Junior High schools in Ponorogo using the purposive sampling technique. Data were collected using in-depth interviews, observation, and documentation, then analyzed using quantitative descriptive and qualitative descriptive. This study aims to determine the profile of students' analytical thinking skills in solving problem-based problems in the grade 8th at pressure material and determine the pattern of its relationship with scientific exploration. The results showed that: 1) the profile of the analytical thinking skill in terms of the learning styles of students, namely the visual style subjects intend to explain what is known through the direct explanation in more detail, the audiovisual subjects are more likely to form simpler patterns with reasoning patterns generalization and on kinesthetic subjects tend to apply different (unique) concepts, but still have a relationship with the problem, 2) the pattern of the relationship between analytical thinking skills and learning styles, namely the exploration of science, which includes aspects of experience, reasoning, modalities, and the mindset of students. Through the results of this study, it is hoped that it can provide theoretical and practical insights for educators in determining approaches and strategies for achieving science analytical competence according to students' learning styles at school.

PENGEMBANGAN PERANGKAT PEMBELAJARAN IPA TERPADU PADA MATERI ENERGI UNTUK SISWA KELAS VII MADRASAH TSANAWIYAH NEGERI 1 KOTA GORONTALO

The purpose and implementation of this research were to produce the development of class VII integrated science learning tools for students of MTsN. 1 Gorontalo’s City dan to determine their effectiveness. The method in this research was used the Research and Development (RD) approach. The step in the research was used the ADDIE models, where the development processes are: Analysis, Design, Development, Implementation, and Evaluation. The results were showed that interpretation of the average assessment of the learning tools (syllabus learning, RPP, LKPD, teaching materials, learning media, and learning outcomes test) was very appropriate. Where the validation index of all of the items was ranged from 0.75 – 0.95. The conclusion was valid by calculating the consistency of the panelists’ assessment, where the reliability was 0.77 – 0.95. the results of observer’s observation (1 and 2) on the implementation of learning as from using of learning tools in the average percentage was obtained 92,35%. There was a significant increase in student outcomes at the pretest and posttest. This increase was included in the category (g-high). Thus the development of integrated science learning tools in energy materials for class VII students was meet requirements that were valid and reliable, feasible, and effective for improving student learning outcomes.

PENGEMBANGAN PERANGKAT PEMBELAJARAN IPA SMP MENGGUNAKAN MODEL PEMBELAJARAN KOOPERATIF TIPE STUDENT TEAMS ACHIEVEMENT DIVISIONS (STAD) BAGI SISWA BERKEBUTUHAN KHUSUS

This study aims to produce a science learning device for junior high school students using a cooperative model type Student Teams Achievement Divisions (STAD) for students with special needs that are valid and fit for use theoretically. The research method used is the development of the 4D model design through 4 stages including the defining stage, the design stage, the development stage, and the dissemination stage. The technique of collecting data through validation sheets consists of lecturers, science teachers, school principals, and students. Based on the research results, the validity of the equipment was obtained through the Aiken V index in the RPP of 0.89, LKPD of 0.88, and THB of 0.88. The three components of the device are considered very valid criteria. The reliability test of each component for RPP is 0.818, LKPD is worth. 0.857, and THB worth 0.884. The components of learning equipment are reliable with good categories based on the Interrater Correlation Coefficient (ICC). Theoretically, the learning tools developed are valid and feasible to be tested in class VIII of the Gorontalo City Learning Activity Center (SKB).

APPLICATION OF DISCOVERY LEARNING MODELS TO LIGHT MATERIALS TO IMPROVE STUDENT LEARNING OUTCOMES

This study aims to describe the results of the application of the discovery learning model on the subject matter of light in class VIIIC students of SMP Negeri 8 Kupang even semester of the 2019/2020 academic year. This research is descriptive. This research was conducted at SMP Negeri 8 Kupang for the 2019/2020 school year. The subjects in this study were researchers and 22 students of class VIIIC at SMP Negeri 8 Kupang, even semester, 2019/2020 academic year. The techniques used to collect data in this study are observation and tests. Based on the results of the descriptive analysis of the research data, it shows that in general, the application of the discovery learning model for the subject matter of light for students is optimal. In detail, the researcher's ability to manage to learn is obtained which includes: planning, implementing, and evaluating learning, including in the good category. The learning outcomes test (THB) of students for cognitive learning outcomes tests on learning implementation activities which include: preliminary activities, core activities, closing activities, time allocation, and class atmosphere are all in the very high category and cognitive achievement for each lesson plan is all complete.