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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 1,179 Documents
 105   106   107   108   109 
Model Based Clustering for Regency/City Grouping Based on Community Welfare Indicators in North Sumatra Hasibuan, Muhammad Afif Fauzi; Cipta, Hendra; Dur, Sajaratud
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6595

Abstract

This thesis aims to apply model-based clustering in grouping regencies/cities in North Sumatra based on Community Welfare Indicators to determine the number of groups (clusters) formed based on community welfare indicators in regencies/cities in North Sumatra and to understand the level of community welfare from this grouping in planning and managing community welfare in regencies/cities in North Sumatra, with the hope of achieving equal welfare in every region. The research method used is Model-Based Clustering, which uses 5 research data variables: HDI, Poor Population, Unemployment Rate, GDP, and Health. In this millennial era, the assessment of community welfare requires more attention. Rapid social, technological, and environmental changes have created new dynamics that can affect community welfare. The evaluation of community welfare is not only limited to economic parameters but also considers health, unemployment, and other factors. By using Model-Based Clustering, it is possible to determine the optimal number of groups (clusters) from various and possibly correlated variables, and the results are easier to understand, making the analysis and understanding of the results easier. Readers can learn about the level of community welfare, and the community and government can evaluate their welfare for future improvements. The research results show that among the groups of regencies/cities formed, five cities consistently show lower Gross Regional Domestic Product (GDP) and Human Development Index (HDI) than other cities. Therefore, a sustainable approach is needed to improve these cities' economic conditions and social welfare.
Propagation of the Vanda helvola Orchid In Vitro Muharyati, Yully; Setiyadi, Muhammad Wahyu; Khatimah, Ainul; Ardiansyah, Ardiansyah
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6600

Abstract

Orchids are more economical and tall than plants and other decorations. One of the orchids cultivated is the Vanda orchid. Seed orchid size is small and does not have endosperm, so it is not easy to germinate in nature, so tissue culture is one multiplication orchid in amount a lot and a short time. This study aims to know the growth of the seed orchid Vanda helvola on different media for 12 days after plant. Seed orchid V. helvola grown on modified Murashinge and Shoog (MS), modified Vaccin and Wend (VW) media and organic media. The research was conducted at the Tissue Culture Laboratory of the UPT Center for Food Crops and Horticulture (BBIPTH), Luwus Tanaban, from February to May 2023. The research method used was observation and experimentation, and the research design used RAK (group random design). Research shows modified MS Media, modified VW and organic capable change seeds orchid V. helvola. Modified MS and modified VW media can induce seed orchid V. helvola germination, and MS media can induce formation protocol.
The Effect of Adding Avocados (Persea americana) on Microbiological and Chemical Qualities in Yoghurt Drinks Fatimah, Siti Alihatus; Agustini, Rudiana
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6601

Abstract

Yoghurt is one of the fermented products from cow's milk and skim milk as a source of protein to cover nutritional needs. With the development of innovation and the creation of food products, yogurt has many flavors from various fruits and vegetables. Yogurt food product innovations can also be made from skim milk combined with the addition of avocados. Avocado is a fruit that contains fiber, riboflavin (B2), niacin (B3), vitamins A, C, E, K, vitamin B6, magnesium, glutathione, and unsaturated fatty acids. The purpose of this study was to describe the effect of the concentration of avocados (Persea americana) on the quality of microbiology (total LAB) and chemistry (pH, fat content, and protein content) in yogurt drinks. The research used laboratory experimental methods, and data analysis was done descriptively. The treatment of adding avocados is 0%, 10%, 15%, and 20%. The results of the study obtained the effect of the concentration value of adding avocados (Persea americana) with the results of the study: the total value of LAB increased from 4.1x109±0.20 CFU/mL (10%) to 4.4x109±0.07 CFU/mL (15%), the pH value decreased from 4.30±0.02 (0%) to 3.89±0.01 (20%), The fat content value increased from 0.05±0.007 % w/b (0%) to 0.57±0.005 % w/b (20%), the protein content value decreased from 3.46±0.02% w/b (0%) to 2.94b±0.00 % w/b (20%). The conclusion of this study is the effect of adding avocados (Persea americana) on the quality of microbiology (total LAB) and chemistry (pH, fat content, and protein content) in yogurt drinks.
Improving Students' Collaboration Skills Using the RADEC Learning Model in Elementary School Science Learning Kiska, Nurul Delima; Haryanto, Eddy; Indryani, Indryani
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 2024
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.v19i2.6606

Abstract

The learning model has an influence on the success of achieving learning objectives. One of the learning models that can improve the skills of students is the RADEC learning model. The syntax contained in the RADEC learning model can help learner-centered learning, namely Read, Answer, Discuss, Explain and Create (RADEC). Currently, collaboration is one of the learning activities that is very popular with students, where currently collaboration skills are found in the 4C skills of the 21st century, however, there are still many students who are still passive in collaborative learning activities. Science and Technology is one of the lessons in the current independent curriculum. This research aims to improve collaboration skills in students using the RADEC learning model. This research uses a classroom action research (PTK) model which is carried out in two cycles consisting of four stages starting from planning, action, observation and reflection. The implementation of learning in this research was carried out using the syntax contained in the RADEC learning model. The selection of research subjects was carried out through purposive sampling techniques and the research subjects in this study were class IV B students with a total of 32 students. Data collection techniques in research are observation and interviews. The results of this research showed an increase from the implementation of cycle I, namely at meeting one and meeting 2 there was an increase of 6.6% and in cycle 2 at meeting 1 and meeting 2 there was an increase of 13.34%. Based on the results of this research, it can be seen that implementing learning using the RADEC learning model can improve students' collaboration skills in science learning. Based on the research that has been done, it can be said that the RADEC learning model can improve student collaboration skills in the learning process which is marked by the fulfillment of collaboration skill indicators by students.
Application of the Support Vector Regression Method with the Grid Search Algorithm to Predict Movement Gold Price Puspita, Reni; Cipta, Hendra; Aprilia, Rima
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 2024
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.v19i2.6607

Abstract

Gold is an investment with the smallest risk because it can be sold anytime and anywhere. In Indonesia, gold bullion as an investment product is known for its purity level of 99.99%, namely gold bullion produced by PT. Aneka Tambang (Antam) through its Precious Metals business unit. Apart from its pure production, Antam gold bullion is easier to resell anytime and anywhere because it has an official certificate from the international gold standardisation institution, namely LBMA (London Bullion Market Association), to more easily estimate the value of gold bullion when sold. To overcome this, predictions of future gold prices are needed. In this research, one of the prediction methods is Support Vector Regression with the Grid Search Algorithm. In this method this method will be used to predict the price of gold, which aims to predict and find out the price of gold one year in the future to produce a level accuracy (MAPE) of 5.43% and the prediction of gold prices increasing from 2023-June-01 to 2024-March-23 while experiencing a decline starting in 2024-March-24. Research by examining the relationship between variables, which emphasises data consisting of numbers so that it is analysed based on statistical procedures using the Support Vector Regression method with data sourced from the daily price of gold bullion through PT. Gallery 24 Pawnshops, North Sumatra. Where this method is very well used in predicting by choosing the best kernel used is the linear kernel because, from these three kernels, the best hyperparameters were obtained for predicting gold price movements using a linear kernel with a division for training and testing data of 60: 40. The MAPE value obtained was 5.43.
Optimization of Polysulfone/Polyethylene Glycol (PSf/PEG) Casted Solution Composition as a Membrane Electrolyte in a Dye-Sensitized Solar Cell (DSSC) Cahyani, Sinta Anjas; Kusumawati, Nita
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6610

Abstract

Stability is the main challenge in developing electrical energy made from sunlight, namely Dye-Sensitized Solar Cell (DSSC). The DSSC system comprises a photoanode, electrolyte, comparison electrode, and dye sensitizer with a photoelectrochemical working principle. Dye sensitizer and electrolyte are the main components that determine the stability of DSSC, with problems such as solvent evaporation leakage in liquid electrolytes and dye desorption. In overcoming these problems, the polymer electrolyte of Polysulfone/Polyethylene Glycol (PSf/PEG) is a solution to the problem by increasing the mobility of I-/I3- ions in the electrolyte. Polymer composition and porogen (pore formers) affect the ionic conductivity, which impacts the electron flow of the DSSC system. Therefore, this study optimized the composition of PSf/PEG polymer electrolyte, namely 18/0, 17/1, 16/2, 15/3, 14/4, and 13/5. This research was carried out using quantitative methods with data processed in a quantitative descriptive manner to determine the performance of DSSC based on PSf/PEG membrane electrolyte. The wavelength absorption of the dye was characterized using a Spectrophotometer UV-Vis instrument, and the specific wavelength was obtained at 573 nm, which indicates anthocyanin absorption. Electrochemical characterization of the dye using voltammetry yielded a resulting energy bandgap value of 0.5132 eV with the touch plot method. Testing the performance and stability of DSSC, voltage, and current measurements were carried out using a multimeter, and fill factor and efficiency calculations were carried out. The performance of DSSC with liquid electrolytes was 1.66%, while that of DSSC with membrane electrolytes of the best composition (16/2) was 1.38% at 0 hours. In addition, the performance test was carried out at 72 hours of exposure time, resulting in an efficiency of 0.77%, while the DSSC with the best composition of membrane electrolyte (16/2) was 1.11%. This shows a decrease in the efficiency of DSSC with liquid electrolytes by 53.43%, while the membrane electrolyte efficiency of DSSC is 19.33-20.17%.
The Influence of E-Book Based on Local Wisdom on the Cognitive Learning Outcomes of Science Junior High School Students Through Outing Class Method Rahmadiningrum, Cahyani; Wulandari, Fitria Eka
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6611

Abstract

This study measures the learning outcomes of the cognitive domain to obtain accurate information about aspects of student domain ability. Cognitive learning outcomes were researched to implement science learning through outing classes using e-books based on local wisdom. This study aims to determine the effect of e-books based on local wisdom on the cognitive learning outcomes of Junior High School students. This study is a quasi-experiment in two groups, namely experimental class (E) and control Class (K), using a direct learning model with a sample of students in class 7K of 33 students and class 7I of 35 students. Data collection techniques using Pretest-Posttest Control Group Design. The study was conducted by inviting students to do outing class learning using e-books, and tests were conducted using pretest and post-test sheets. The research Instrument used consisted of cognitive questions totaling 20 multiple choice questions with data analysis using inferential statistics with a T-test (independent samples t-test) on SPSS version 26. Results research shows no significant effect on the use of e-books based on local wisdom on the classification of living things, where the learning outcomes of experimental classes with e-book treatment are higher than the control class without e-book treatment. Thus, using e-books based on local wisdom is quite influential in improving cognitive understanding and student learning outcomes.
Determination of Antioxidant Activity in Kombucha of Kecombrang Flower (Etlingera elatior) for the Development of Functional Beverages Sintyadewi, Putu Rima; Fitriani, Pande P. Elza
Jurnal Pijar Mipa Vol. 19 No. 2 (2024): March 2024
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.v19i2.6616

Abstract

Researchers have widely reported that Kombucha is a probiotic drink with health benefits. Some researchers are innovating to find other kombucha media sources besides tea that contain high bioactive compounds. Kecombrang flowers contain high bioactive compounds and have physiological functions for health, but this plant has not been widely explored for other innovative beverage or food products. This study aimed to determine the optimal fermentation time of kecombrang flower kombucha (Etlingera elatior) to produce the highest antioxidant activity during fermentation. The experimental design used was a complete randomized design (CRD) with 7 variations of fermentation time (days 0, 3, 6, 9, 12, 15, and 18) with a sugar concentration of 10% b/v, and this treatment was repeated four times. In this research, pH, total acid, and total flavonoid tests were also carried out to see the characteristics of the kecombrang flower kombucha drink during fermentation. Data analysis was performed with an ANOVA at P < 0,05. The results showed that the length of fermentation time had a very significant effect (P < 0,01) on the antioxidant activity of Kombucha. These results indicate that the size of fermentation time affects the antioxidant activity of kecombrang flower kombucha. Optimal antioxidant activity was obtained after the kombucha drink was fermented for 6 days, as indicated by the low IC 50 value of 37,73 g/mL, with a pH of 3,7, total acid of 0,33%, and total flavonoids of 5,9 mg/L QE. Based on a research study, kecombrang flower kombucha has strong antioxidant activity (IC50 < 50 ppm), so kecombrang flower kombucha can be used as a choice for functional drinks.
Development of Electronic Student Worksheet Inquiry-Based with Multiple Representations of Chemistry on Reaction Rate Material to Practice Students Critical Thinking Skills Rahma, Eka Aprilia; Novita, Dian
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6628

Abstract

This research aims to describe the feasibility of Electronic Student Worksheet Inquiry with Multiple Chemical Representations to Train Students' Critical Thinking Skills on Reaction Rate Material. The feasibility of e-worksheet is reviewed in terms of validity, practicality, and effectiveness. This research uses the Research and Development (R&D) method with the ADDIE model limited to the development stage. A limited trial was conducted in January 2024 on 32 students who received reaction rate material. The research results showed that the validity of the e-worksheet was declared valid based on the criteria for content validity getting mode four and construct validity getting mode 3. The practicality of e-worksheet was declared practical based on the results of the student response questionnaire, which showed a percentage of 98.4%. e-worksheet was declared effective based on the t-test results with a significance level 0.05, resulting in a t count of 68.50. Based on these results, it can be concluded that e-worksheet is suitable for use in practicing critical thinking skills on reaction rate material.
The Effect of Polyetherimide Polymer Membrane Composition on the Performance Efficiency of Dye Sensitized Solar Cell (DSSC) Based on Natural Photosensitizer of Butterfly Pea Flowers Fachrirakarsie, Fadlurachman Faizal; Kusumawati, Nita
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
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.v19i3.6636

Abstract

Global energy consumption will grow 1.3% in 2023-2024. This raises concerns about the scarcity of energy sources, most of which come from coal. This research is a true experiment with a one-shot case study design and aims to analyze the Dye-Sensitized Solar Cell (DSSC) from butterfly pea flowers (BPF) extract. However, DSSC has significant problems with liquid electrolyte leakage and solvent evaporation. Therefore, polyetherimide (PEI) membranes were investigated to overcome this problem. The BPF extract was examined for wavelengths, producing 573 nm and 617 nm wavelengths. The band gap was also checked, and it was found to produce 0.52 eV. The membrane used has five variations, where M3 is the most stable, with a reduction in performance efficiency of only 98%. The membrane has a porous surface, asymmetric structure, and a crystallinity degree of 12.77%. Overall, this membrane shows the most optimal performance in DSSC among other membranes.

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