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INDONESIA
Indonesian Journal of Science and Technology
Published by Universitas Pendidikan Indonesia
ISSN : 25278045     EISSN : 25281410     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Arjuna Subject : -
Articles 220 Documents
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The Compleat Lextutor Application Tool for Academic and Technological Lexical Learning: Review and Bibliometric Approach Amirullah Abduh; Ade Mulianah; Besse Darmawati; Fairul Zabadi; Umar Sidik; Wuri Handoko; Karta Jayadi; Rosmaladewi Rosmaladewi
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.63539

Abstract

This research aims to portray the current representation of the term “technology” in association with other related terms in language education. The method used for this study is the combination of content analysis representation of both compleat lextutor analytical tool and bibliometric approach. The finding of the research is that four basic areas relate to language and technology in language training: multiculturalism and technology become a central theme; the technology in language skill, knowledge, and assessment; technology and thinking; and technology in language and linguistics. This research implies that educators should be able to utilize available practical technological tools for teaching, learning, analyzing, and modeling language education. Further, this research has been limited to the area of published manuscripts of language education which may cover specifically non-empirical primary data. Therefore, further empirical research may bolster the current findings of the bibliometric research on language and technology in language education.
Biomass-Based Supercapacitors Electrodes for Electrical Energy Storage Systems Activated Using Chemical Activation Method: A Literature Review and Bibliometric Analysis Ida Hamidah; Ramdhani Ramdhani; Apri Wiyono; Budi Mulyanti; Roer Eka Pawinanto; Lilik Hasanah; Markus Diantoro; Brian Yuliarto; Jumril Yunas; Andrivo Rusydi
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.60688

Abstract

Currently, carbon derived from biomass waste or residues is being intensively utilized as electrodes due to its excellent electrical properties, including high conductivity, appropriate porosity, and a specific surface area suitable for supercapacitor applications. Despite its advantages, the performance of supercapacitors made from biomass-derived carbon is insufficient for engineering applications because of the challenges in obtaining the mesoporous structure of activated carbon (AC). Therefore, this study highlights the potential of biomass-based carbon as the electrodes of a highly efficient supercapacitor, which can facilitate highly efficient current transport in energy storage systems. It comprehensively discusses various biomass material sources and activation methods to produce carbon, with a focus on the physical and electrical properties. Initially, the study discusses carbon activation methods and mechanisms to understand why activating agents and electrolyte solutions have a high specific surface area and specific capacitance. It then concentrates on the chemical activation method and its importance in making AC useful as an efficient electrode. Finally, in this study, various biomass sources were discussed to highlight the performance of supercapacitors electrodes originating from agricultural and wood residues relating to the specific capacitance and capacitance retention. Based on the obtained results, it is concluded that biomass-based carbon materials could be the most advantageous platform material for energy conversion and storage.
How to Make and Characterize Hydroxyapatite from Eggshell Using the Hydrothermal Method: Potential Insights for Drug Delivery System Ferli Septi Irwansyah; Alfi Ikhlasul Amal; Eko Prabowo Hadisantoso; Atiek Rostika Noviyanti; Diana Rakhmawaty Eddy; Risdiana Risdiana; Suryana Suryana; Shariffuddin Bin Md Zain
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.60825

Abstract

Hydroxyapatite (HA) has garnered significant attention as a versatile biomaterial with promising applications in drug delivery systems. This study aimed to synthesize and characterize HA derived from eggshells using the hydrothermal method and explore its potential insights for drug delivery systems. We delivered a step-by-step process to produce HA using a hydrothermal method, supported by several analyses, X-Ray Diffraction (XRD) to analyze the crystallinity structure, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Particle Size Analyzer (PSA), and Brunauer-Emmett-Teller (BET). The stage is continued with a study on the potential of HA as a drug delivery system with UV-Visible spectrophotometer instrumentation. The results suggest that the characterized HA suits drug delivery systems due to its favorable properties. This study contributes to the understanding of utilizing hydroxyapatite from eggshells as a viable material for drug delivery systems, opening avenues for further research and development in this field.
Antiangiogenesis Activity of Indonesian Local Black Garlic (Allium Sativum ‘Solo): Experiments and Bibliometric Analysis Retno Arianingrum; Nurfina Aznam; Sri Atun; S. Senam; Alya Rizkita Irwan; Nida Qurbaniah Juhara; Nadiya Fitri Anisa; Latifah Kurnia Devani
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.63334

Abstract

Cancer is still one of the leading causes of death in the world. Angiogenesis is the formation of new blood vessels, which plays a vital role in the growth of cancer cells. As a result, inhibition of proangiogenic factors such as vascular epidermal growth factor (VEGF) could be used as a cancer treatment strategy. Black garlic (BG) is processed fresh garlic (Allium sativum L.) for several days under controlled high temperature and humidity. The research aims to investigate the effect of Indonesian local BG on antiangiogenic activity through in vivo and in silico studies. The in vivo test was carried out by observing the formation of new blood vessels using the Chorio-Allantoic Membrane Assay (CAM). The in silico study was performed by docking analysis of BG bioactive compounds on the VEGF receptor (VEGFR). The results showed that ethanol extract, ethyl acetate fraction, and n-hexane fraction of BG inhibit new vessel blood formation, with n-hexane fraction having the highest efficacy. The molecular docking assay indicated some similarities in the amino acids involved in the interaction between the BG bioactive compounds and the native ligand in binding to VEGFR. This similarity may lead to interference with VEGFR resulting in angiogenesis inhibition. The study suggests that BG has the potential to be developed as an anticancer agent, which might be through the mechanism of inhibiting the angiogenesis process
Step-by-Step Fabrication of PVDF-TiO2 Hollow Fiber Membrane and Its Application Desalination of Wetland Saline Water via Pervaporation M. Mahmud; Muthia Elma; Aulia Rahma; Nurul Huda; Riani Ayu Lestari; Awali S. K. Harivram; Erdina L. A. Rampun; Mohd H. D. Othman; Muhammad Roil Bilad
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.63433

Abstract

Wetland water is opted as the source of domestic water supply when the availability of clean fresh water is scarce. Wetland water requires proper treatment due to the high concentration of organic matter and high salinity, particularly in the dry season. This research aims to synthesize, characterize, and investigate the performance of polyvinylidene fluoride (PVDF)-TiO2 hollow fiber membrane for wetland saline water desalination via pervaporation. The PVDF-TiO2 hollow fiber membranes were fabricated through the dry wet spinning method under various air gaps (10, 15, and 20 cm). Then, the resulting membranes were tested in a pervaporation process at temperatures of 25, 40, and 60°C. Results show that the incorporation of TiO2 into the PVDF matrix imparted hydrophilicity properties into the resultant membranes. The presence of TiO2 was confirmed by the TiO2 stretching vibration at 1640 cm-1 (FTIR) and the TiO2 phase at diffraction peaks at 25.5 and 37°. The membranes exhibited the highest water flux (7.48 kg/m2.h) and salt rejection ( 99.5%) at 40°C. Overall, the developed PVDF-TiO2 hollow fiber membranes showed encouraging results and demonstrated their effectiveness for the desalination of wetland saline water.
Characteristics of Tamarind Seed Biochar at Different Pyrolysis Temperatures as Waste Management Strategy: Experiments and Bibliometric Analysis Ali Rahmat; Sutiharni Sutiharni; Yetti Elfina; Yusnaini Yusnaini; Hadidjah Latuponu; Faidliyah Nilna Minah; Yeny Sulistyowati; Abdul Mutolib
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.63500

Abstract

Household activities and beverage industries that use tamarind often generate waste in the form of tamarind seeds. Tamarind seeds account for approximately 40% of the total weight of the fruit. If these tamarind seeds are not properly managed, they end up as waste with no economic or other benefits. One effective waste management strategy is to convert tamarind seeds into biochar. This research aims to examine the characteristics of biochar produced from tamarind seeds at different pyrolysis temperatures. The results indicate that as the pyrolysis temperature increases, the fixed carbon content also increases. Pores begin to form on the surface of the biochar at a temperature of 400°C. We have identified functional groups such as C-H, O-H, C≡N, C≡C, C=C, C=O, CH3, C-O, and C-C in the biochar. The dominant elements in tamarind seed biochar are K2O, CaO, P2O5, SO3, and MgO, which are part of macronutrients and alkaline elements with the potential to improve soil quality as soil amendments.
Microwave Pyrolysis of Agricultural and Plastic Wastes for Production of Hybrid Biochar: Applications for Greener Environment Sridevi, Veluru; Hamzah, Husam Talib; Jweeg, Muhsin Jaber; Mohammed, M. N.; Al-Zahiwat, M. M.; Abdullah, Thamer Adnan; Abdullah, Oday I.
Indonesian Journal of Science and Technology Vol 9, No 3 (2024): IJOST: December 2024
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v9i3.75049

Abstract

The microwave-assisted pyrolysis (MAP) is a promising technology for converting waste feedstocks (AWB and PW) into valuable products, primarily biochar. The residual product generated from the AWB and PW MAP process is called hybrid biochar. The hybrid biochar made by MP is highly stable, has distinctive physical and chemical characteristics, and outperforms its conventional usage. Microwave heating is an efficient and fast energy heating method. It helps with yield production, eliminates the need for liquid convection, makes thermal control easier, restores waste products' chemical and energy value, and produces the highest quality and most cost-effective hybrid biochar. Different feedstocks and microwave pyrolysis settings affect how well hybrid biochar restores the environment. This article examines hybrid biochar's potential to boost agricultural productivity, nutrient availability, co-composting, water retention, and consumption efficiency. The report also reveals knowledge gaps and suggests further research to better understand hybrid biochar deployment. The study also detailed hybrid biochar's production, characterization and, most importantly, environmental use.
Comprehensive Characterization of Gelatin Films from Goat Skin Incorporating Konjac Glucomannan: Physical, Mechanical, and Molecular Properties Hasdar, Muhamad; Nalinanon, Sitthipong; Kittiphattanabawon, Phanat; Sriket, Chodsana
Indonesian Journal of Science and Technology Vol 9, No 3 (2024): IJOST: December 2024
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v9i3.75048

Abstract

This study aimed to comprehensively investigate and characterize the physical, mechanical, and molecular properties of gelatin films made from goat skin incorporated with konjac glucomannan. The study involved three treatment groups, labeled GG/KG1, GG/KG2, and GG/KG3, which included konjac glucomannan at concentrations of 0, 10, and 20% (w/w), respectively. Glycerol at 20% (w/w) was also included as a plasticizer. All samples underwent homogenization and ultrasonic treatment. The addition of konjac glucomannan to the gelatin-based film resulted in changes such as increased thickness (0.033 - 0.093 mm), opacity (0.9910 - 1.0433 mm-1), color L* (92.45 - 92.77), color difference (48.13 - 48.38), swelling (65.53 - 69.47%), and contact angle (86.92 - 127.85o). Conversely, a decrease was observed in water activity (0.521 - 0.463 Aw), moisture content (9.87 - 9.62%), tensile strength (0.0171 - 0.0118 N/mm2), elongation at break (5.91 - 4.52%), young’s modulus (0.0029 - 0.0026 N/mm²), WVTR (118.99 - 116.82 g/m². day), transparency (81.59 - 67.33%), and water resistance (34.47 - 30.53 %). Additionally, the peaks of amides A, B, I, II, and III exhibit both a shift and an increase in intensity, suggesting structural modifications and molecular interactions. The microstructure also indicated the presence of goat skin gelatin and konjac glucomannan cross-linked in the film formation. Therefore, the addition of konjac glucomannan modifies gelatin-based films, enhancing their suitability for food packaging.
Triazolopyrimidine Derivatives: A Comprehensive Review of Their Synthesis, Reactivity, Biological Properties, and Molecular Docking Studies Mrayej, Hajar El; En-nabety, Ghizlan; Ettahiri, Walid; Jghaoui, Mohamed; Sabbahi, Rachid; Hammouti, Belkheir; Rais, Zakia; Taleb, Mustapha
Indonesian Journal of Science and Technology Vol 10, No 1 (2025): IJOST: April 2025
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v10i1.80301

Abstract

Triazolopyrimidines are heterocyclic compounds with a unique structure and a wide range of applications in medicinal chemistry. The versatility of the triazolopyrimidine scaffold allows for the exploration and development of compounds with diverse pharmacological properties. This literature review encompasses the period from 2014 to 2022 and offers a comprehensive and inclusive overview of the synthesis, reactivity, and biological properties studies of triazolopyrimidines. The review summarizes the various synthetic methods used to prepare triazolopyrimidines and their reactions with different reagents. It also examines their pharmacological properties, such as anti-COVID-19 and anticancer effects, and their molecular docking analysis with relevant targets. The review aims to contribute to a better understanding of the potential applications of triazolopyrimidine in the field of medicinal chemistry. This literature review from 2014 to 2022 provides a comprehensive exploration of triazolopyrimidines, highlighting their diverse applications in medicinal chemistry. The review aims to offer a thorough understanding of triazolopyrimidines' versatility, serving as a valuable resource for advancing drug development in medicinal chemistry.
Enhanced Thermal Performance of Parabolic Through Collectors with TiO₂ Nanofluids in An Arid Climate Belhadi, Mohammed Abdelkrim; Kadja, Mahfoud; Mechighel, Farid; Khechekhouche, Abderrahmane; Hamaiti, Youcef
Indonesian Journal of Science and Technology Vol 10, No 1 (2025): (ONLINE FIRST) IJOST: April 2025
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v10i1.81280

Abstract

Solar energy is a crucial renewable resource, yet its efficient utilization remains a challenge because conventional heat transfer fluids have limited thermal conductivity. Parabolic Trough Collectors (PTCs) offer a viable solution for solar thermal energy conversion, but optimizing performance is essential for improving efficiency. This study investigates the performance of a PTC using a 0.3% TiO₂-water nanofluid compared to distilled water (DW) under real environmental conditions in Algeria’s arid climate. Two identical PTCs were tested outdoors at flow rates of 0.2, 0.3, and 0.4 L/min to evaluate heat transfer efficiency. The results demonstrated that the nanofluid consistently outperformed DW because of its superior thermal conductivity and heat retention. At 0.4 L/min, the nanofluid achieved 40% thermal efficiency, 9% higher than DW. However, as the flow rate decreased, the efficiency gap narrowed. These findings confirm the potential of nanofluids to enhance solar energy utilization, supporting sustainable energy solutions in high-irradiance regions.

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