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Saprizal Hadisaputra
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INDONESIA
Jurnal Pijar MIPA
Published by Universitas Mataram
ISSN : 19071744     EISSN : 24601500     DOI : -
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal Pijar MIPA (e-ISSN: 2460-1500 & p-ISSN: 1907-1744) is an open-access scientific periodical journal published by the Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA publishes original articles on current issues and trends in mathematics-science-science education studies. In addition, this journal addresses issues concerning environmental education and environmental science. The journal scopes are: a. Physics and Physics Education b. Chemistry and Chemistry Education c. Biology and Biology Education d. Natural Science and Science Education e. Mathematics and Mathematics Education f. Environmental and Environmental Education
Arjuna Subject : Umum - Umum
Articles 1,179 Documents
 70   71   72   73   74 
Validity of problem-based learning tools with the steam approach to improve student learning outcomes on thermodynamics material Sarmila B. Ali; Mursalin Mursalin; Trisnawaty Junus Buhungo
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5521

Abstract

The purpose of this research is to describe the level of validity of learning devices that use problem-based learning models with the STEAM approach to improve student learning outcomes in thermodynamics material. This research is a type of research and development (R&D). This research was conducted in class XI IPA I SMA Negeri 1 Limboto Barat, Kec. Limboto Barat, Kab. Gorontalo for the 2022/2023 academic year. This study uses the ADDIE development model: analysis, design, development, implementation, and evaluation. The results of this study indicate that learning tools that use the problem-based learning model with the STEAM approach are declared valid and suitable for use in the learning process. It can be seen from the validation results which show that the average validation of the developed learning tools obtains very valid criteria.
Development of interactive powerpoint learning media based on contextual to improve student learning outcomes on volume materials Shintya Eka Rosalia Putri; Erwin Putera Permana; Rian Damariswara
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5524

Abstract

This research is being carried out after observations and interviews at SDN Kraton, there is a problem that students need better learning outcomes. It's due to the need for more media for the learning process; the learning resources are only student books and lecture methods. So, it is necessary to develop the media to support the learning process with the hope of maximum learning outcomes. Applying actual concepts to learning mathematics in everyday life relates to contextual approaches. In reality, in everyday life, mathematics plays a vital role. This research aims to develop a contextual-based interactive PowerPoint learning medium to improve student's learning outcomes in the V class of SDN Kraton. This development research uses the ADDIE model development modes. This research's subject is the SDN Kraton V class, with 18 students. This product passes through the validation stage of the material expert, the media validation test, the elevation response of students and teachers, and the pretest-postest. The validation test obtained an 87.5% score with valid criteria. The media expert's validation gets an 80% acquisition with a very valid criterion. Student response scores a percentage score of 83.33% with highly practical criteria, and teacher response gains a 90% achievement with highly pragmatic criteria. The product test was declared effective by increasing the pretest to the posttest with an average of 0.7 over the average criteria. So, the use of learning media can enhance student learning outcomes.
Effect of concentration sulfuric acid on alumina extraction from napa soil Fiqrhatul Ilmi; Mawardi Mawardi
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5546

Abstract

West Sumatra is one of Indonesia's provinces with abundant and diverse natural potential. Based on data from the Department of Energy and Mineral Resources, West Sumatra province has a rich potential for metal and non-metallic minerals. Some types of minerals include gold lead (Au), zinc (Zn), manganese (Mn), coal, ironstone, and others. In iron ore, metal minerals contained iron minerals and gangue minerals such as silica and alumina. Napa soil is one of the materials found in West Sumatra containing aluminosilicate with a SiO2/ Al2O3 ratio of 63.20 %/ 16.55 %. It also contains TiO2, CaO, and K2O. Extraction of alumina generally using HCl or H2SO4 solvent. In previous research, HCl has been used as a solvent in extracting alumina from napa soil. Based on the literature search, no one has used H2SO4 as a solvent in the extraction of alumina from napa soil; therefore, it is necessary to conduct research as a material for further study. Therefore, this study will be conducted on variations in the concentration of acid solvents to determine the optimum amount of alumina products in the extraction of alumina in napa soil. In this study, the optimum results obtained alumina extraction with variations in the sulfuric acid concentration at a concentration of 6.0 M, with a % yield of 26.73%. The XRF analysis of alumina extraction showed that the Al2O3 content increased by 72.89%. Characterization of Alumina by FTIR indicated the presence of Al-O, Al-OH.
The description of students learning difficulties in reaction rate materials Della Rezkyta Amanda; Fajriah Azra
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5577

Abstract

Reaction Rate is material that high school students study in class XI MIPA in odd semesters. In this material, as much as 77.64% of SMAN 16 Padang class XI MIPA students have yet to achieve the minimum criteria set. It indicates that students have learning difficulties. Learning difficulties are failures in achieving learning goals characterized by low learning outcomes. This study aims to determine the percentage of students who experience learning difficulties for each indicator on the material reaction rate and determine the factors that cause learning difficulties experienced by students in terms of learning methods. This research is a type of descriptive research. The sample for this research was students in class XI MIPA 3 at SMAN 16 Padang in the 2022/2023 academic year, which consisted of 36 people. The research instruments used were two-tier multiple-choice diagnostic tests, questionnaires, and interviews. The data analysis used is descriptive, namely analyzing and providing an understanding of the data in the form of numbers so that an overview can be given in an orderly, concise, and clear manner. The results of this study stated that students of SMAN 16 Padang experienced learning difficulties in tar material with a high category. The highest difficulty level is found in the 3rd indicator (Explaining the effect of surface area on the rate of reaction), which is equal to 83.33%. Learning difficulties experienced by students are caused by ineffective learning methods, such as making study schedules and carrying them out, reading and taking notes, repeating material, concentrating, and doing assignments.
Description of student learning difficulties in the thermochemistry Silvira Rahmi; Fajriah Azra
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5581

Abstract

Thermochemistry is a material high school students study in class XI MIPA in odd semesters. In this material, 83.69% of SMAN 13 Padang class XI MIPA students still need to achieve the minimum completeness criteria set. It indicates that students have learning difficulties. Learning difficulties are failures to attain learning goals characterized by low learning outcomes. This study aims to determine the percentage of students who experience learning difficulties for each indicator on thermochemistry material and determine the factors that cause learning difficulties experienced by students in terms of learning methods. This research is a type of descriptive research. The sample for this research was students in class XI MIPA 6 at SMAN 13 Padang in the 2022/2023 academic year, which consisted of 34 people. The research instrument was a diagnostic test with four-tier multiple-choice questionnaires and interviews. The data analysis used is descriptive, namely analyzing and providing an understanding of the data in the form of numbers so that an overview can be given in an orderly, concise, and transparent manner. The results of this study stated that students of SMAN 13 Padang had difficulty learning thermochemistry material in the high category. The highest difficulty level is found in the sixth indicator (determining the ∆H value of the reaction through a calorimeter experiment), which is 90.20%. Meanwhile, the lowest level of learning difficulty for students is found in the first indicator (explaining differences in systems and environments in chemical reactions), which equals 42.16%. Learning difficulties experienced by students are caused by ineffective learning methods, such as not making a study schedule and not carrying it out, not reading and not taking notes, not repeating material, not concentrating, and not doing assignments.
Description of student learning difficulties in the acid-base material Annisa Annisa; Fajriah Azra
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5583

Abstract

Acid-base material is material that class XI IPA students study in the even semester. In this material, 81.38% of class XI IPA students at SMAN 16 Padang have yet to achieve the minimum criteria set. It indicates that students have learning difficulties. Learning difficulties are failures to attain learning goals characterized by low learning outcomes. This study aims to determine the percentage of students who experience learning difficulties for each indicator on acid-base material and determine the factors that cause learning difficulties experienced by students in terms of learning methods. Its research is a type of descriptive research. The sample for this research was students in class XI IPA 2 at SMAN 16 Padang in the 2022/2023 academic year, which consisted of 34 people. The research instrument was a diagnostic test with two-tier multiple-choice questionnaires and interviews. The data analysis used is descriptive, namely analyzing and then providing an understanding of the data in the form of numbers so that an overview can be given in an orderly, concise, and clear manner. The results of this study stated that students of SMAN 16 Padang had learning difficulties in acid-base material, with a percentage of 66.65% in the high category. The highest difficulty level is found in the first indicator (Analyzing the properties of the solution based on the acid-base theory according to Arrhenius, Bronsted-Lowry, and Lewis) of 72.88%. Ineffective learning methods cause learning difficulties experienced by students. Effective ways of learning are making study schedules and carrying them out, reading and taking notes, repeating subject matter, concentrating, and doing assignments.
Description of students learning difficulties in the atomic structure Nesha Putri Adi; Fajriah Azra
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5584

Abstract

Atomic structure material is studied by high school students in class X in odd semesters. In this material, as much as 66.81% of class X students of SMAN 13 Padang have yet to achieve the minimum criteria set. It indicates that students have learning difficulties. Learning difficulties are failures in achieving learning goals characterized by low learning outcomes. This study aims to determine the percentage of learning difficulties experienced by students in atomic structure material and determine the factors that cause students' learning difficulties in terms of learning methods. This research is a type of descriptive research. The sample for this research was 36 students in class X E3 of SMAN 13 Padang in the 2022/2023 academic year. The research instrument was a diagnostic test with two-tier multiple-choice questionnaires and interviews. The data analysis used is descriptive, namely analyzing and providing an understanding of the data in the form of numbers so that an overview can be given in an orderly, concise, and clear manner. The results of this study stated that students of SMAN 13 Padang experienced learning difficulties in atomic structure material with a high category. The highest difficulty level is found in the fourth indicator (Determining electron configurations and quantum numbers), which is 81.25%. Learning difficulties experienced by students are caused by ineffective learning methods, such as not making a study schedule and not carrying it out, not reading and not taking notes, not repeating material, not concentrating on learning, and not doing assignments.
Reducing free fatty acids and peroxide value in used cooking oil using activated coconut shell charcoal combined with lemongrass stems Nurlaila Agustikawati; Rizky Nugrahani; Fitri Setianingsih
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5586

Abstract

Used cooking oil is obtained from the residue of the frying process, which has been used repeatedly where the fatty acids are increasingly saturated and the triglyceride content breaks down into volatile and non-volatile components that dissolve in oil. Used cooking oil waste can cause an increase in COD and BOD levels in waters, resulting in the death of aquatic biota. The aims of this study were (1) to determine the optimum contact time of activated charcoal d combination of citronella sticks on decreasing levels of free fatty acids, (2) to determine the optimum contact time of activated charcoal d combination of citronella sticks on decreasing peroxide numbers, (3) to determine the average percentage of free fatty acid reduction and peroxide value in the clarification of used cooking oil using activated coconut shell charcoal combined with lemongrass stems. This research method is a laboratory experiment with despising, neutralization, and bleaching stages. The results showed that the average decrease in optimum free fatty acid levels occurred at 60 minutes of contact time, namely A3 at 73.86%, B3 at 66.67%, and C3 at 82.74%. The average decrease in the optimum peroxide number occurred at a contact time of 60 minutes, namely A3 of 57.16%, B3 of 52.85%, and C3 of 49.68%. So, the coconut shell-activated charcoal combined with lemongrass stems effectively clarifies the used cooking oil. In the future, it is necessary to vary the absorbent particle size to improve the quality of the waste cooking oil so that it can be reused.
Incorporating citronella oil into edible coating to extend the stable life and improve the quality of banana fruit Iqbal Kamar; Dewi Yunihharni
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5593

Abstract

Carboxymethyl cellulose (CMC) is a linear polysaccharide with long chains soluble in water and anionic. It exhibits high viscosity and possesses non-toxic and non-allergenic properties. The use of plant-based essential oils in edible films to replace vegetable oils, cereals, or seeds. One essential oil with good antibacterial activity is the oil derived from citronella leaves. The main components of this citronella oil compound consist of citronellal, citronellol, and geraniol, which can inhibit bacterial activity. Therefore, it is necessary to develop technology for handling fresh fruits to inhibit excessive ripening and decay. This can be achieved by creating an edible coating with essential oils. This study aims to investigate the impact of using an edible covering (carboxymethyl cellulose) incorporated with lemongrass oil on the storage of bananas. The experimental design employed in this study utilized a Completely Randomized Design (CRD) with one factor, namely citronella oil (0.3%, 0.6%, and 0.9%), as well as the application of edible coating with two elements, namely treatment variations (layer and non-coating) and storage duration (day 0 to day 15). The storage process is conducted until ripening occurs in banana fruits for 16 days, with daily observations. Throughout the storage procedure, various metrics were monitored in bananas, including weight loss, acidity level (pH), and total plate count (TPC). The research findings indicate that the highest weight loss of banana fruit is observed in bananas without edible covering, amounting to 13.10%. Conversely, bananas with edible coating and 0.5% lemongrass oil exhibit a lower weight loss of 7.35%. The application of edible coating significantly impacts the increase in pH and total microbial growth on banana fruits.
Antifungal activity test of nanosilver combination with lip balm cosmetic preparation Elys Safitri; Titik Taufikurohmah
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5601

Abstract

Nanosilveris is a silver-based material with nanometer particle sizes (1-100 nm) predicted to be antifungal or an alternative to preservatives in lip balm preparations that are biocompatible. The nanosilver synthesis process in this study used the bottom-up method by adding sodium citrate as a reducing agent and stabilizer. This study aimed to determine the characteristics of the results of 20 ppm nanosilver synthesis using a UV-Vis and TEM spectrophotometer and to determine the antifungal activity of nanosilver in lip balm cosmetic preparations. Variations in adding 20 ppm nanosilver into lip balm preparations are 5%, 10%, and 15%. The results of characterization using a UV-Vis spectrophotometer, namely 20 ppm nanosilver, were quite stable in storage for 2 months, and the results of characterization using TEM also showed that the formed nanosilver remained stable with a nanometer size range ranging from 11.42 nm to 43.95 nm. The antifungal activity test was carried out using the Direct Microscopic Count (DMC) method by counting directly under a microscope. Based on the data obtained, it shows that the antifungal activity of the combination of nanosilver and lip balm preparations is almost equivalent to the antifungal activity of parabens. It has produced lip balm preparations with nanosilver. This is indicated by the value of the inhibition rate (%). The inhibition of fungal growth produced by lip balm preparations with parabens is almost the same as the inhibition rate (%) produced by lip balm preparations with nanosilver. The inhibition rate of lip balm preparations with parabens was 89.11%. In comparison, the inhibition rate of lip balm preparations with a nanosilver concentration of 15% was 82.31%, so it can be concluded that nanosilver has good antifungal activity and is biocompatible so that nanosilver can be used as an alternative to paraben preservatives.

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