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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. 19 No. 3 (2024): May 2024" : 30 Documents clear
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.
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.
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.
Development of Interactive Edugame Learning Media Based on Snakes & Ladders to Improve IPAS Learning Outcomes Fatmawati, Erma; Andriani, Aldina 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.v19i3.6668

Abstract

The use of learning media that is a game has never been developed by teachers, resulting in low learning outcomes of IPAS light and sound material. The purpose of this study was to develop, test the feasibility, and effectiveness of interactive edugame learning media based on snakes & ladders to improve the cognitive learning outcomes of IPAS for fifth grade students of SD Negeri Candi 01 Semarang City. The type of research used is Research and Development (R&D) research with the Borg and Gall development model. The subjects of this research were 24 fifth grade students of SD Negeri Candi 01 Semarang City. Data collection techniques used non-test techniques (observation, interviews, questionnaires, data and documentation) and test techniques (pretest and posttest). The data analysis technique begins with the normality test, then the T test and the N-Gain test to show the final results. The results of this study are as follows 1) Snakes & ladders-based interactive edugame learning media was developed using Canva and Genially applications in the form of a flipbook with components, namely cover, preface, table of contents, character introduction, concept map, learning outcomes, learning objectives, materials, games, LKPD, images, animations, experimental videos, and HOTS questions. 2) The results of the feasibility test from media experts obtained a score of 91% with a very feasible category and material experts obtained a score of 93% with a very feasible category. 3) The effectiveness of snakes & ladders-based interactive edugame learning media comes from the results of the pretest and posttest, based on the cognitive learning outcomes of students showing an increase in change, namely the normality test analysis shows that the data is normally distributed. The T test results obtained Sig. (2-tailled) 0.001 <0.05. The N-Gain test results were 0.84 with high criteria. The conclusion of the development of interactive edugame media based on snakes & ladders was successfully developed with very feasible and effective to improve the cognitive learning outcomes of IPAS fifth grade students of SD Negeri Candi 01 Semarang City.
Increasing Peroxide Number of Sumbawa Oil Through Ozonation Process Using Double Dielectric Barrier Discharge (DDBD) Plasma Reactor Puryadi, Puryadi; Hilmi, Amirul; Ulfa, Andi Maria
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.v19i3.6706

Abstract

Oil is one of the most popular media for the ozonation process compared to other media such as water or saline methods or direct exposure to blood. Ozonated oil has an advantage over other ozone therapy methods because ozonated oil has an antiseptic activity that is several hundred times higher than ozonated saline. Sumbawa oil is one of the local wisdom products of the Sumbawa tribal community, which is generally used as medicine or massage therapy to heal injuries such as broken bones, tendonitis, bruises, back pain and treatment of various skin wounds. An ozonation process can be carried out to increase the ability of Sumbawa oil to regenerate skin and repair tissue. Ozonation uses a Double Dielectric Barrier Discharge (DDBD) plasma reactor. The DDBD Plasma Reactor is a reactor that can produce ozone gas with very high purity. Pure ozone gas is very well applied in the medical world. This research aims to increase the peroxide levels in Sumbawa oil by ozonation using a Double Dielectric Barrier Discharge (DDBD) Plasma reactor. The flow rates used were 0.1 L/minute, 0.4 L/minute and 0.7 L/minute for 1 hour, 3 hours and 5 hours. The results showed that the peroxide value increased with increasing oxygen flow rate and ozonation time. The highest peroxide value was obtained at a flow rate of 0.7 L/minute for 5 hours, namely 332.03 mg Eq/kg Sumbawa oil. Increased by 282.71 mg Eq/kg; the peroxide figure for Sumbawa oil without ozonation was 49.32 mg Eq/kg.
Determining Zoning of Areas Affected by Flood Disasters in Medan City Using Silhouette Coefficient and Davies Bouldin Index Analysis Eliza, Novi; Husein, Ismail; 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.v19i3.6707

Abstract

Several sub-districts are cities that are pretty or even very vulnerable to flood disasters. Therefore, the Government must observe which areas are highly prone to flooding to anticipate safety precautions. One of the relevant methods for handling this case is k-means clustering using the Silhouette Coefficient and Davies-Bouldin Index evaluation. This research uses a quantitative approach using the Silhouette Coefficient and Davies Bouldin Index Analysis method. Based on the research that has been carried out, the results can be obtained that cluster 1 consists of the sub-districts of Medan Polonia, Medan Johor, Medan Selayang, Medan Baru, Medan Tuntungan and Medan Barat. Cluster 2 only has one member, namely the Medan Maimun sub-district; Cluster 3 consists of Medan Sunggal and Medan Belawan sub-districts, and Cluster 4 consists of Medan Marelan, Medan Helvetia and Medan Timur sub-districts. The results of the clustering evaluation that was carried out obtained a Silhouette Coefficient value of 0.505539942 and a Davies-Bouldin Index value of 0.30055. This means that the grouping carried out in this research is accurate.
Synthesis of Green Carbon Dots from Nephelium Lappaceum L. Seeds Kamali, Siti Raudhatul; Hamdiani, Saprini; Hermanto, Dhony; Saputri, Dinar Suksmayu; Chen, Chang-Nan
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.v19i3.6708

Abstract

In this study, rambutan (Nephelium Lappaceum L.) seeds were used to fabricate green carbon dots (gCDs) by employing a hydrothermal process. The synthesized CDs were evaluated using Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) for the structural properties as well as UV-Vis and fluorescence spectrophotometry for the optical properties. UV-Vis examination revealed that the produced gCDs showed emission-dependent photoluminescence excitation, with two absorption peaks at 265 nm and 330 nm. The presence of functional groups and chemical composition such as C=C, C=O, -COOH, and -OH on the surface of gCDs was confirmed by the results of FTIR and XPS spectra. Consequently, gCDs present several opportunities for exploration in a range of applications.

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