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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 30 Documents
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Search results for , issue "Vol. 20 No. 7 (2025)" : 30 Documents clear
Validation of Instrument to Measure Science Pre-Service Teachers Digital Skills: Confirmatory Factor Analysis Ningthias, Dyah Pusptasari; Qudratuddarsi, Hilman
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10423

Abstract

Validating instruments that measure digital skills—such as through Confirmatory Factor Analysis (CFA)—is crucial to ensure that pre-service teachers, particularly those from Generation Z, possess accurate, reliable, and pedagogically meaningful digital competencies. Using a quantitative survey design, data were collected from 349 Generation Z pre-service teachers across four science specializations (chemistry, physics, biology, and general science). The instrument used was adapted from previous studies and translated using the back-translation method to ensure its validity. Confirmatory Factor Analysis (CFA) was employed in AMOS 24 to evaluate both first-order and second-order models to analyze the data.  The six dimensions assessed—Access to and Management of Digital Content (AMDC), Use of Digital Means (UDM), Communication Skills (CS), Creative Skills (CrS), Digital Safety Skills (DSS), and Digital Empathy (DES)—demonstrated strong loadings onto the higher-order construct of Digital Skills (standardized regression weights = 0.94–0.97). Model fit indices confirmed the robustness of the structure (χ² = 865.079, RMSEA = 0.075, TLI = 0.908, CFI = 0.923). Reliability was high, with Cronbach’s alpha ranging from 0.674 to 0.966 and Composite Reliability (CR) exceeding 0.70 for most constructs. Correlation analysis revealed strong interrelationships among dimensions (r = 0.779–0.998), underscoring the integrated nature of digital skills. The findings suggest that digital skills among pre-service science teachers can be conceptualized as a unified but multidimensional construct. The validated instrument offers a reliable tool for assessing digital competencies in teacher education. Practically, the results have implications for curriculum development, underscoring the need to integrate digital literacy training into teacher preparation programs. Future research should expand validation to diverse cultural contexts and apply longitudinal approaches to capture changes in digital skill development over time.
Analysis of Leaf Area Index of Shade Trees and Its Relationship with the Discomfort Index: A Case Study at the University of Mataram Campus Suripto, Suripto; Rahayu, Rachmawati Noviana; Supardiono, Supardiono; Dujana, Lalu Muhammad Aby; Genggelang, Feby Ayu
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10455

Abstract

The development of shade trees on the Mataram University campus is intended to maintain environmental comfort, as well as add beauty. The microclimate softening function of trees is largely determined by the density of their canopies, known as the leaf area index (LAI). Various LAI measurement methods have been developed, which are generally more suitable for assessing tree productivity but less valid for assessing the ability to soften the microclimate or decrease the discomfort index (DI). This study was conducted to analyze the distribution of LAI of shade trees and their relationship with the DI on the Mataram University campus. To obtain a more valid LAI value, the leaf area variable measured was the leaf area forming the canopy, replacing the leaf area on the canopy surface, as was done in previous studies. Microclimate variables measured to determine the discomfort index (DI) were air temperature and relative humidity. The results showed that the LAI of 108 trees (33 species) spread across 9 zones within the Mataram University campus ranges from 1.2630 (very small category) to 9.6735 (very large category). The DI values under the canopy of trees ranged from 23.225 (quite comfortable category) to 26.869 (somewhat comfortable category). The relationship between LAI of shade trees and DI on the campus of Mataram University was linear and negative, with the resulting regression equation being y = 28.1204-0.4749x. If LAI increased, then DI tended to decrease; conversely, if DI increased, then LAI tended to decrease. The function of campus trees in softening the microclimate can be enhanced by improving their LAI.
Optimization of Biodiesel Synthesis from Kapok Seed Oil (Ceiba pentandra) through Transesterification Reaction with a TiO2 Catalyst Rozitawati, Mona; Gunawan, Erin Ryantin; Suhendra, Dedy; Farida Ariani
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10514

Abstract

Biodiesel represents a renewable, environmentally friendly, and locally producible alternative to conventional diesel fuel. This research synthesized biodiesel from kapok seed oil (Ceiba pentandra) via transesterification using a TiO₂ catalyst, with process parameters optimized to maximize yield. Kapok seed oil was extracted using Soxhlet extraction with n-hexane and purified by vacuum column chromatography. The transesterification process involved systematic variation of the oil-to-methanol molar ratio, catalyst mass, reaction temperature, and reaction time. Optimal conditions were established at a 1:10 molar ratio, 0.20 g of catalyst mass, a reaction temperature of 60 °C, and a reaction time of 90 minutes, resulting in a biodiesel yield of 71.58%. Characterization of the biodiesel revealed a density of 0.88 g/mL, viscosity of 3.10 cSt, acid value of 1.89 mg NaOH/g, and saponification value of 231.879 mg KOH/g. GC-MS analysis identified methyl palmitate, methyl linoleate, and methyl oleate as the principal methyl ester components, with methyl oleate as the predominant species. These findings demonstrate that biodiesel derived from kapok seed oil possesses properties suitable for use as an alternative fuel that meets established quality standards.
Exploration of Salam Leaf Extract (Syzygium polyanthum) as a Natural Indicator for Acid-Base Titration: Color Stability and Endpoint Accuracy Nasirsah, Nasirsah; Fatma, Fatma Suryani Harahap; Siregar, Rabiyatul Adawiyah; Siregar, Elda Sari; Tuah, Sahlan
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10547

Abstract

Acid-base indicators play an important role in titration, but the use of synthetic indicators such as phenolphthalein is increasingly criticized for being toxic, carcinogenic, and environmentally unfriendly. Therefore, this study was conducted with the aim of developing bay leaf extract (Syzygium polyanthum) as a safer, natural indicator, thereby supporting the concept of green chemistry. The study was carried out in four stages, namely first, extraction with ethanol: water solvent (70:30 and 50:50), second, color change test in pH 4, 7, and 10 buffer solutions using visual documentation and UV-Vis spectrophotometry. Third, validation of effectiveness in HCl–NaOH titration with phenolphthalein as a comparator. Additionally, stability and reproducibility tests were conducted over a 7-day storage period. The results showed that bay leaf extract remained stable for at least seven days, exhibiting a significant λmax change profile at 405–425 nm, which varied according to pH changes. This indicates the sensitivity of phenolic pigments to acidic, neutral, and basic conditions. In titration validation, the extract with 50/50 solvent showed an identical titrant volume to phenolphthalein (25.0 mL; deviation 0%), while the 70/30 solvent showed a deviation of -14.6%. Stability tests showed that the extract was relatively stable for up to 7 days in dark conditions with a decrease in absorbance <10%, while reproducibility tests produced inter-user variations <5%. These findings suggest that bay leaf extract has strong potential as a reliable, stable, and consistent natural indicator, making it a worthy alternative to synthetic indicators in environmentally sustainable chemistry education and research laboratories.
Testing of Soil Moisture and Temperature Sensors in an Automatic Plant Watering System Based on the Internet of Things (IoT) Yudoyono, Susilo; Setiawan, Dewa Gede Eka; Yunus, Muhammad; Latief, Muh. Fachrul; Meidji, Icha Untari
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10585

Abstract

The implementation of automated plant watering systems in the agricultural sector utilizes sensor technology based on the Internet of Things (IoT). This study aims to evaluate the performance of soil moisture and temperature sensors utilizing the IoT in an automated plant watering system. The sensors used are the YL-69 sensor to determine soil moisture and the DS18B20 temperature sensor to determine soil temperature. Both sensors are connected to the NodeMCU ESP8266 microcontroller. Testing was conducted from 07:00 to 17:00 WITA, with a 1-hour interval for data collection, monitored using the IoT on the blink application on the cellphone. Then, the data obtained is analyzed to determine the values of error and accuracy. The results obtained on the soil moisture sensor have an average error of 0.989% with an average accuracy of 99.011%. Meanwhile, the results obtained on the soil temperature sensor have an average error of 1.240% with an average accuracy level of 98.760%. The lower the error value, the better the sensor performance indicates the sensor's ability to read data that is close to the actual value of the comparison tool. Likewise, the higher the level of sensor accuracy, the better and more reliable the sensor is when used in an IoT-based soil temperature measurement system. This value indicates that the sensor's performance has a very high level of reliability and precision in detecting soil moisture and temperature in real-time. This system can be applied in agricultural technology education and vocational training programs.
The Effect of Different Doses of Compost and Urea Fertilizer on the Growth of Pak Choi (Brassica rapa L.) Merta, I Wayan; Raksun, Ahmad
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.7543

Abstract

Pak Choi is a widely cultivated plant species in Indonesia. To grow optimally, Pak Choi requires a growing medium containing sufficient nutrients. To ensure adequate nutrient levels in the growing medium, fertilization is necessary. Research on the effect of compost and urea fertilizer applications on Pak Choi growth was conducted from March to June 2025. This study aims to analyze the vegetative growth of Pak Choi after being given compost and urea fertilizer treatments. In this study, a completely randomized design with 2 factors was used. The compost application was 0 kg, 0.8 kg, 1.6 kg, and 2,4 kg for 8 kg of soil in a polybag. The urea fertilizer treatment was 0 grams, 0.5 grams, 1 gram, and 1.5 grams for each plant. Each treatment combination was performed with three replications. The results showed that the compost treatment had a significant effect on the fresh weight, number of leaves, plant height, and leaf length of Pok choy. The application of urea fertilizer can increase the fresh weight, number of leaves, plant height, and leaf length of Pak Choi. The interaction between compost and urea fertilizer had no significant effect on fresh weight, leaf number, plant height, or leaf length. The optimal dose of compost was 1.2 kg. The 1.5-gram urea fertilizer treatment resulted in better growth than the other doses.
The Utilization of Medicine Plants by the Community of the Traditional Village Dasan Beleq Gumantar Regency, North Lombok, Indonesia Hidayah, Nurul; Hadiprayitno, Gito; Karnan, Karnan; Irawan, Jono
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.8175

Abstract

The traditional village community of Dusun Dasan Beleq is the oldest Sasak tribe in Lombok and still maintains local wisdom in using plants as traditional medicine. This study aimed to identify the plant species, parts, and processing methods used by the local community for medicinal plants. This type of research is descriptive. The data were collected through primary research, including semi-structured interviews and non-participatory observations. The respondents were selected by purposive sampling, including traditional leaders and the local community. The stages of data analysis are data reduction (Data Reduction), data presentation (Data Display), and conclusion. The results showed that the people of the Dusun Dasan Beleq Traditional Village had knowledge of 25 species from 22 plant families. Leaves are one of the most commonly used plant parts besides flowers, fruits, seeds, and rhizomes. The processing of medicinal plants used by the people of the Dusun Dasan Beleq Traditional Village involves methods such as pounding, boiling, and squeezing.
Student Involvement Model in Laboratory Maintenance According to ISO 17025 Muhsin, Muhsin; Ilhamdi, Mohammad Liwa; Wirandanu, Lalu Septiadi
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10053

Abstract

Student engagement in laboratory quality systems is essential for strengthening maintenance compliance and technical competence, particularly when aligned with international standards such as ISO 17025:2017. This study aims to (1) design a student engagement model that complies with the requirements of clauses 6.2.2 and 7.6 of ISO 17025:2017 and (2) analyze the impact of its implementation on improving equipment maintenance compliance and student technical competence. The research design employs an explanatory sequential mixed-methods approach, with a dominant quantitative component and qualitative support. The research subjects included 22 key informants (laboratory coordinators, laboratory heads, technicians, and students) who were selected with purposive sampling. Data were collected through structured questionnaires, in-depth interviews, FGDs, and participant observation. Quantitative data were analyzed using multiple linear regression using SPSS 25, while qualitative data were analyzed thematically. The results showed that the model designed based on four pillars: training, documented participation SOPs, internal audit simulations, and portfolio systems effectively transformed students from passive learners into competent contributors to the laboratory quality assurance system. The implementation of the model was proven to significantly improve maintenance compliance (mean = +1.81) and technical competence (mean = +1.59). Regression analysis confirmed that the model explained 80.2% of the variance in compliance (R² = 0.802) and 78.1% of the variance in competence (R² = 0.781), with documentation quality (β = 0.462; β = 0.423) as the strongest predictor. Qualitative findings revealed a shift in mindset from obligation to ownership as a key mechanism. This study concludes that the developed model not only aligns with ISO 17025 but also provides a strategic approach to building sustainable quality cultures in educational laboratories.
Sustainability Analysis of the Vertical Composter as an Innovative Approach for Organic Waste Management and Space-Efficient Urban Food Sholehah, Hijriati; Nurhidayah, Nurhidayah; Rahmawati, Khairul Pahmi
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10429

Abstract

The waste problem is a never-ending problem, so it is everyone's responsibility to find solutions to the existing waste problem. According to data from the Ministry of Environment and Forestry in 2022, waste in Indonesia is predominantly composed of organic waste, accounting for 41.27% of the total waste. The purpose of this study was to determine plant growth by utilizing used barrels as a vertical composter for organic waste, which is useful for providing small-land farming, and to determine the quality of liquid and solid fertilizers. The method used was a laboratory experiment. The results of the study were as follows: the number of mustard green leaves was 15 cm, and the bok choy leaves were 13 cm. The total height of the mustard greens was 40 cm, and the bok choy was 20 cm. The length and area of ​​the leaves continue to increase by around 0.2 cm or more per day. The highest nutrient content in both compost and liquid fertilizer is P2O5 in Gegelengan Village, 4.223% in compost, and 5.4% in Kediri Village in liquid fertiliser, while the lowest is the N-Total content of 0.5% (compost) and 1.2% (liquid fertilizer). The research results obtained from the initial soil, solid organic fertilizer and liquid organic fertilizer met the quality standards based on the Decree of the Minister of Agriculture No. 261/KPTS/SR.320/M/04/2019.
Development of Chemistry Magazine Containing Content on Cross-Aldol Condensation Reaction as Reading Material for Polyfunctional Organic Compounds Lectures Rahmawati, Rahmawati; Hidayah, Weny Amanatul; Al Idrus, Syarifa Wahidah
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
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.v20i7.10544

Abstract

Chemistry magazines have the potential to be effective media because they are able to present material in a more interesting, concise manner, and are supported by visualizations that clarify abstract concepts. The use of chemistry magazines is expected to help students deepen their understanding of the aldol condensation reaction mechanism and other organic materials. This study aims to develop a chemistry magazine that contains content on the cross-aldol condensation reaction mechanism as a supplementary reading for students in the Polyfunctional Organic Compounds course. The type of research used is research and development (R&D) with a 4D model that includes the stages of define, design, develop, and disseminate. The subjects of the study were students from the Chemistry Education Study Program at the University of Mataram, while the object of the research was a chemistry magazine developed based on the results of a student needs analysis. Data were collected through expert validation sheets and student response questionnaires, then analyzed descriptively and quantitatively using Aiken's V formula to measure validity and percentage of agreement (PA) to measure reliability. The results showed that the chemistry magazine obtained an average validity score of 0.93, categorized as “highly valid,” and a reliability level of 94%, categorized as “reliable.” Meanwhile, the results of the practicality test, as obtained by students, achieved a percentage of 85% with the category “very practical”. Thus, the chemistry magazine developed is declared feasible and practical for use as additional reading material to enhance students' understanding of the cross-aldol condensation reaction mechanism in the Polyfunctional Organic Compounds course and to foster an interest in learning chemistry independently.

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