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Justek : Jurnal Sains Dan Teknologi
Published by Universitas Muhammadiyah Mataram
ISSN : 26205475     EISSN : 26205475     DOI : -
Core Subject : Science, Education, Engineering,
Computer Science & IT Control & Systems Engineering Education Mathematics
Arjuna Subject : -
Articles 300 Documents
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The Effect Of Porosity On The Critical Temperature Of Porous Alumina Ceramics Asep Saputra; Parmin Lumban Toruan; Atina Atina
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40611

Abstract

Porous alumina ceramics are widely used in high-temperature applications due to their thermal stability; however, they are vulnerable to thermal shock, which may induce microcrack formation due to thermal stress. Although the influence of porosity on thermal shock resistance has been widely investigated, numerical studies on its effect on the critical cracking temperature remain limited. This study aims to analyze the effect of porosity on the critical temperature of porous alumina ceramics under thermal shock using a Finite Difference Method (FDM) simulation. Porosity variations of 10%, 20%, 30%, and 40% were considered. Thermal shock was modeled by applying a sudden temperature of 2000 K on one side of the material, while the initial temperature was set at 300 K. The resulting temperature distributions were used to evaluate thermal stress and determine the critical temperature for each porosity level. The results show that increasing porosity reduces the maximum thermal stress from 265 MPa at 10% porosity to 60 MPa at 40% porosity. The critical temperature increases from 533 K at 10% porosity to 663 K at 30% porosity, then decreases to 583 K at 40% porosity. These findings provide insight into the role of porosity in controlling thermal shock resistance and can support the optimization of porous alumina ceramics for high-temperature applications.
Design of a Raw Material Inventory Control Information System Using the EOQ Method with Supplier Integration : A Case Study of CV. Troy Metal Faizal Armansyah; Mohammad Fajar Nurwildani; Siswiyanti Siswiyanti
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.41322

Abstract

Troy Metal is a manufacturing company that produces stove tops and still uses conventional methods to manage raw material inventory, which can potentially lead to overstock and stockout situations. This study aims to implement the Economic Order Quantity (EOQ) and Reorder Point (ROP) methods in a web application-based raw material inventory control information system integrated with supplier management. This is an applied study using a quantitative approach. Data were collected through observation, interviews, and documentation, including data on raw material demand, ordering costs, holding costs, lead time, safety stock, and supplier information. The EOQ and ROP methods were used to determine the economic order quantity and reorder point, while the system’s functionality was tested using Black Box Testing. The developed system is capable of managing raw material data, supplier data, and inventory transactions; automatically calculating EOQ and ROP; providing reorder notifications; and generating and sending Purchase Orders (POs) to suppliers via email. The implementation results showed an EOQ value of 1,387 kg and an ROP value of 599.54 kg, providing the company with a more systematic basis for determining reorder quantities and timing. The results of Black Box Testing showed that all system functions operate in accordance with functional requirements. Thus, the developed system is capable of supporting more effective control of raw material inventory and improving the efficiency of the procurement process through the integration of supplier management into a single information system.
Learning Media and Problem Based Learning Integration in Biology: Systematic Literature Review and Bibliometric Analysis Fitri Amelia; Wilda Syahri; Afreni Hamidah
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.38681

Abstract

This study is a systematic literature review and bibliometric analysis of the integration of learning media with the problem-based learning model in biology education. The research problem arises from students' low understanding of complex biological concepts and the lack of learning media capable of developing higher-order thinking skills. The purpose of this study is to identify publication trends, dominant biology materials, types of media, development models, and research gaps that can serve as directions for future research. Data were collected from 30 articles published between 2019 and 2025 through national and international databases. Bibliometric analysis was conducted using network, overlay, and density visualizations to trace conceptual relationships, thematic dynamics over time, and the density of scientific contributions. The results show that the most studied biology topics were ecosystems, excretory systems, biodiversity, and environmental pollution. The most frequently developed learning media were e-modules and E-LKPD, with the ADDIE and 4D models as the dominant development frameworks. Bibliometric visualization also revealed that research focus is still concentrated on general terms such as problem, medium, and development, while the integration of complex, abstract, and multilevel Biology content remains low. These findings indicate the need to develop media that supports in-depth scientific understanding as well as critical and creative thinking skills. This study provides an empirical basis for more adaptive, interactive, and relevant PBL media innovation for Biology education in the future.
The Effect of the Combination of 2,4-D and BAP and Lighting Conditions on Callus Induction of Sugarcane (Saccharum officinarum L.) Variety CMG Agribun Lailatun Ni'mah; Noor Aini Habibah
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40673

Abstract

This study aimed to evaluate the effect of different combinations of 2,4-D and BAP, as well as light conditions, on callus induction of sugarcane variety ‘CMG Agribun’. A factorial Randomized Complete Block Design (RCBD) was applied with two factors: plant growth regulators (PGRs) combinations (2,4-D and BAP) and lighting conditions (light and dark). Observed parameters included callus initiation time, percentage of callus formation, fresh and dry weight, and callus morphology. The results showed that the treatments significantly affected callus initiation time but not the percentage of callus formation. The fastest callus induction (2.83 DAP) occurred under dark conditions with 1 ppm 2,4-D + 0 ppm BAP and 4 ppm 2,4-D + 1 ppm BAP. The fresh weight of the callus did not show any significant differences among the treatments, but the treatment under dark conditions tended to produce a higher fresh weight of the callus. The highest dry weight (0.092 g) was also obtained from the treatment 1 ppm 2,4-D + 0.5 ppm BAP under dark conditions. Callus morphology was generally compact with varying colors. Further research is recommended using a wider range of 2,4-D and BAP concentrations, as well as different light regimes, to optimize callus induction and development. This study supports further research on callus-based propagation and the production of secondary metabolites in sugarcane.
The Potential of Methanol Extract from Avocado Seeds (Persea Americana Mill) As an Αlfa-Glucosidase Inhibitor Zainal Abidin; St. Maryam; Nurhijrah Nurhijrah
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.39864

Abstract

Alpha-glucosidase inhibitors are commonly used as first-line drugs in the treatment of Type 2 Diabetes Mellitus, specifically to manage postprandial hyperglycemia. Avocado seeds (Persea americana Mill)  have been recognized for their antidiabetic properties, attributed to their rich content of bioactive compounds such as polyphenols, flavonoids, tannins, and alkaloids. The antidiabetic activity of these compounds can be evaluated by measuring the absorption of p-nitrophenol, a product of the hydrolysis of p-nitrophenyl-α-D-glucopyranose (PNP) by the α-glucosidase enzyme. This study aims to assess the antidiabetic potential of methanol extract from avocado seeds by determining its α-glucosidase inhibitory activity based on the IC50 value. Methods. The methanol extract was obtained through maceration, and its α-glucosidase inhibitory activity was analyzed using an ELISA reader (Enzyme-Linked Immunosorbent Assay) at a wavelength of 405 nm. Results and Conclusion. The findings revealed that the methanol extract of avocado seeds exhibited significant inhibitory activity, with an IC50 value of 11.314 μg/mL, classifying it as a highly potent α-glucosidase inhibitor.
Interactive Photosynthesis Media Design Based on Seren Taun Local Wisdom to Improve Students' Critical Thinking Skills Dinda Dinda; Atang Sutisna
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40865

Abstract

This research is motivated by the limited integration of local wisdom in learning and the use of digital interactive learning media by teachers. This study aims to develop and test the feasibility, practicality, and effectiveness of interactive learning media based on local wisdom of the Seren Taun traditional ceremony using the Genially platform on the Photosynthesis material of the Natural Sciences content to improve students' critical thinking skills. The research method used is Research and Development (R&D) with the ADDIE development model. The research subjects involved 24 fourth-grade students of SDN 4 Kuningan as samples. Data collection was carried out through validation sheets, response questionnaires, and tests (pre-test and post-test). The results of the study showed that the developed interactive media was "Very Feasible" based on the assessment of media experts by 88% and material experts by 86%. This media was also declared "Very Practical" based on the average score of teacher and student responses which reached 80%. Furthermore, the effectiveness test showed a significant increase in students' critical thinking skills with an N-Gain score of 0.55 (category "Medium"). Based on these results, it can be concluded that interactive learning media based on local wisdom Seren Taun is effective in improving the critical thinking skills of fourth grade elementary school students.
Spatiotemporal Analysis of LST in the Cities of Lubuklinggau and Palembang, 2019–2023 Muhamad Vercillyo Nugraha; Alif Noor Anna
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40351

Abstract

Land surface temperature changes are an important indicator in identifying the impact of urbanization and land use change on the urban environment. Palembang and Lubuklinggau are two cities in South Sumatra Province with different geographic characteristics and levels of urbanization, potentially resulting in different thermal conditions. This study aims to analyze and compare the distribution of land surface temperature (LST) in the two cities in 2019 and 2023 and identify its relationship with vegetation conditions and regional development. The study used a remote sensing approach utilizing Landsat 8 and Landsat 9 imagery. The study used a remote sensing approach utilizing Landsat 8 and Landsat 9 imagery. The analysis was conducted using ENVI 5.3 and ArcGIS 10.8 for Land Surface Temperature (LST) and Normalized Difference Vegetation Index (NDVI) calculations and for spatial and temporal analysis of LST distribution changes. The results showed that the average temperature in Lubuklinggau City increased from 20.3°C to 22.5°C, while Palembang City experienced a decrease from 29.6°C to 28.8°C.  However, Palembang still had a higher surface temperature than Lubuklinggau throughout the observation period. Spatial analysis shows that areas with higher vegetation density tend to have lower surface temperatures than built-up areas. This finding suggests that land use characteristics and vegetation distribution play a significant role in shaping surface temperature patterns in urban areas. The research findings are expected to inform spatial planning and climate change mitigation strategies in South Sumatra Province.
The Prepare , Plan , Design , Implement , Operate , and Optimize Methods on Wireless- Based Internet Networks Ovalia Dortjie Odja; Krisantus J. Tey Seran; Hevi Herlina Ullu; Guido Adolfus Suni
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.41160

Abstract

Penelitian ini bertujuan untuk meningkatkan kualitas jaringan internet berbasis wireless di SMP Negeri Neonbat dengan menerapkan metode PPDIOO (Prepare, Plan, Design, Implement, Operate, dan Optimize). Permasalahan yang dihadapi sekolah meliputi koneksi internet yang tidak stabil, jangkauan jaringan yang terbatas, serta penggunaan jaringan yang masih bergantung pada kabel LAN sehingga belum mampu mendukung kegiatan pembelajaran secara optimal. Metode penelitian yang digunakan adalah deskriptif kualitatif dengan pendekatan studi kasus melalui observasi, wawancara, dan dokumentasi. Hasil penelitian menunjukkan bahwa penerapan metode PPDIOO berhasil meningkatkan kualitas jaringan internet di SMP Negeri Neonbat. Perancangan jaringan menggunakan topologi star dengan perangkat Mikrotik, switch, dan access point yang ditempatkan pada titik strategis sehingga jangkauan jaringan menjadi lebih luas dan merata. Selain itu, diterapkan manajemen bandwidth menggunakan metode PCQ dan Simple Queue untuk membagi akses internet secara adil antara guru dan siswa. Hasil pengujian jaringan menunjukkan konektivitas berjalan dengan baik dan stabil, dengan kecepatan download jaringan siswa mencapai 33,75 Mbps dan upload 18,74 Mbps, sedangkan jaringan guru mencapai download 34,43 Mbps dan upload 45,68 Mbps. Hasil ini membuktikan metode PPDIOO mampu menyelesaikan permasalahan konektifitas di SMP Negeri Neonbat.
Effects of Picloram–Kinetin and Light Conditions on Callus Induction of Chrysanthemum morifolium 'Puspita Nusantara' Sabrina Febrianti; Noor Aini Habibah; Furzani Pa’ee
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40469

Abstract

Callus induction is influenced by growth regulators and environmental factors. This study evaluated the effect of picloram–kinetin combination and light conditions on callus formation in internode explants of Chrysanthemum morifolium ‘Puspita Nusantara’. A completely randomized block design was used with four concentrations of picloram (0–3 ppm), four concentrations of kinetin (0–3 ppm), and two light conditions (light and dark), resulting in 32 treatment combinations with three replications. Callus initiation time, percentage of callus formation, biomass, and callus morphology were observed in this study. The results showed that callus initiation time did not differ significantly among treatments. However, the interaction between picloram, kinetin, and light conditions significantly affected the percentage of callus formation, fresh weight, and dry weight. Most treatments containing picloram achieved 100% callus formation, while treatments without picloram showed a lower level of formation. The highest fresh weight was obtained in 2 ppm kinetin + 3 ppm picloram under light conditions (0.3510 ± 0.09 g), while the highest dry weight was recorded in 2 ppm kinetin + 2 ppm picloram under light conditions (0.0364 ± 0.015 g). Light conditions generally promoted greater biomass accumulation than dark conditions. All calli exhibited a compact texture, with green to yellow-green coloration under light and yellow to pale-yellow coloration under dark conditions. Overall, 2 ppm kinetin combined with 3 ppm picloram under light conditions was the most effective treatment for callus induction and biomass production. This study provides the first baseline data on callus induction in C. morifolium ‘Puspita Nusantara’, for which no previous reports are available. These findings support future callus-based propagation and secondary metabolite studies.
Characteristics and Business Feasibility of Fresh Noodles Product from Sweet Potato Flour with Moringa Leaves Sethyo Vieni Sari; Mia Angela Safitri; Yulius Beni; Yuni Selvianti Sari
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.41279

Abstract

Moringa leaves added to fresh noodles made from sweet potato flour significantly increase nutritional content and improve the texture and flavor of the noodles, thereby enhancing their market value. This study aims to determine the best treatment combination for producing wet noodles made from white sweet potato flour with the addition of moringa leaf puree, analyze the organoleptic characteristics of the resulting wet noodles, as well as their chemical characteristics, particularly ash content and this study aims to assess the financial feasibility. The method used was an experiment varying the composition of moringa leaves (25 grams; 37,5 grams; and 50 grams) on organoleptic characteristics and ash content, along with a business feasibility evaluation conducted through financial analysis. The results showed that F3 (50 g moringa leaf puree) was the best formulation, with 1,19% ash content and 94% yield, meeting the SNI 01-2987-1992 standard. Moringa leaf puree significantly affected color, taste, and aroma (p<0,05), but not texture. Financial analysis showed a profit margin of 82%, B/C ratio of 5,43, payback period of 2,8 years, and break-even selling price of Rp2.764 per package, indicating that the product is economically feasible for small and medium-scale production.

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