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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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Interpretation of Fourier Transform Infrared Spectra (FTIR): A Practical Approach in the Polymer/Plastic Thermal Decomposition Asep Bayu Dani Nandiyanto; Risti Ragadhita; Meli Fiandini
Indonesian Journal of Science and Technology Vol 8, No 1 (2023): IJOST: April 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i1.53297

Abstract

Fourier transform infrared (FTIR) is one of the tools to represent molecular structure based on atomic vibration. It can denote a specific property of the chemical bond and molecular structure in the material, especially when analyzing specimens relating to plastics, polymers, and organic components. The FTIR peaks and spectrum act as a fingerprint of a specific molecular structure and chemical bonding, which need a sufficient reference database to distinguish them. This paper is to address issues of the need for a reference database of FTIR. This paper exhibits step-by-step information on how to read and interpret the FTIR spectra and identify a molecule's backbone with its functional groups. Practical examples from the analysis of several plastics/polymers and the thermally decomposing plastics/polymers were included to help and guide the reader to comprehend the basic concept of FTIR spectra.
Sustainable Production-Inventory Model with Multi-Material, Quality Degradation, and Probabilistic Demand: From Bibliometric Analysis to A Robust Model Dana Marsetiya Utama; Imam Santoso; Yusuf Hendrawan; Wike A. P. Dania
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.54056

Abstract

An adequate sustainable production inventory model is expected to represent complex real-life cases involving fuel, emissions, and electricity costs as well as multi-materials, quality degradation, and probabilistic demand. Therefore, this study was conducted to develop this kind of model to determine the number of raw material shipments (), production cycle time (), and the number of finished goods delivered (n) to maximize the Expected Total Profit (ETP). The proposed model is based on a bibliometric literature analysis of the sustainable production-inventory problem which is visualized using the VOSviewer. Moreover, a sophisticated Harris-Hawks Optimization (HHO) algorithm was proposed to solve the problems identified in the sustainable production inventory model optimization. It is also important to note that three numerical cases were provided to evaluate the performance of the algorithm. The findings showed that the suggested HHO method outperforms the Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) in maximizing ETP and this means it is better for ETP optimization. It was also discovered from the sensitivity analysis that an increase in the rate of quality degradation (k) led to a reduction in both the ETP and T.
Design of Robust Control for Vehicle Steer-by-Wire System Suha S. Husain; Mina Qays Kadhim; Abdulkareem Sh. Mahdi Al-Obaidi; Alaq F. Hasan; Amjad J. Humaidi; Dwi Novia Al Husaeni
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.54794

Abstract

This study presented the design of a robust controller based on Integral Sliding Mode Control (ISMC) for controlling the Vehicle Steer-by-Wire (VSbW) system. The dynamic model of the VSbW system is first developed and then the design of ISMC has been conducted via the states of the system. The VSbW system has been described by two terms; one term represents the nominal model, which is free from nonlinearities, and the other term lumps the uncertainties in system parameters. The integral sliding mode controller has been designed for controlling the VSbW system. The control design consists of two parts. The first control part has addressed the nominal term of the system, while the second control part tackles and eliminates the effects of uncertainties and perturbation due to the uncertain term of the system. The numerical simulation has been conducted to show the robustness of ISMC and its capability to reduce the chattering effect in the control signal. In addition, a comparison study in performance has been conducted between the proposed controller and other controllers in the literature. We also carry out bibliometric analysis to see research trends. Based on our analysis, the number of publications regarding the keywords "controller", "steer", and "wire system" changes every year (25 (2018), 56 (2019), 51 (2020), 71 (2021), and 61 (2022)).
Phytochemical Profile and Biological Activities of Ethylacetate Extract of Peanut (Arachis hypogaea L.) Stems: In-Vitro and In-Silico Studies with Bibliometric Analysis Idin Sahidin; N. Nohong; Marianti A. Manggau; A. Arfan; W. Wahyuni; Iren Meylani; M. Hajrul Malaka; Nur Syifa Rahmatika; Agung W. M. Yodha; Nur Upik En Masrika; Abdulkadir Kamaluddin; Andini Sundowo; Sofa Fajriah; Rathapon Asasutjarit; Adryan Fristiohady; Rina Maryanti; Nur Indri Rahayu; M. Muktiarni
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.54822

Abstract

The utilization of the stems, leaves, and hulls of peanuts (Arachis hypogea) is not as popular as the seeds. This study aimed to investigate the chemical contents and pharmacological activities of A. hypogaea stems in-vitro and in-silico. This study was also completed with bibliometric analysis. The methanol extract (ME) was reextracted by ethylacetate to get ethyl acetate extract (EAE). The chemical contents of EAE were analyzed by phytochemical screening, Liquid Chromatography-Mass Spectroscopy (LC-MS/MS), TPC (Total Phenolic Content), and TFC (Total Flavonoid Content). In-vitro and in-silico studies evaluated antioxidant potency, toxicity, and cytotoxicity toward MCF-7 cell lines. The results showed that EAE contained terpenoids, flavonoids, alkaloids, and phenolics which were supported by LC-MS/MS data. The EAE was categorized as a very strong antioxidant and moderately active in both cytotoxicity and toxicity.
Green Route Synthesis of Amorphous Silica from Oil Palm Decanter Cake: From Literature Review to Experiments Nursyahirah Abdul Rahim; Noorfidza Yub Harun; Anwar Ameen Hezam Saeed; Muhammad Roil Bilad
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.53724

Abstract

Numerous agricultural wastes are well-defined as low-cost sources and rich in silica content. The residue of oil palm wastes combustion seems a promising silica source and can be recovered through a straightforward method. In this study, the combustion followed by an alkaline extraction method was employed to extract high purity of silica. The oven-dried oil palm decanter cake (DOPDC) was heated at combustion temperatures of 600, 700, 800, and 900°C to produce OPDC ashes (OPDCA), followed by an alkaline extraction using 5M of NaOH solution. Thermogravimetric analysis (TGA) was used to observe the thermal behavior of DOPDC where the suitable combustion temperatures to produce silica ranged between 600 and 1000 ℃. X-Ray Fluorescence (XRF) analysis showed that silica contents were 31-36% after combustion, increasing to 76.95% after the chemical treatment. Moreover, the spherical shape of the silica was observed through electron microscope analysis. It was represented by the aggregation of silica after going through chemical treatment. The X-Ray Diffraction analysis also proved that the amorphous silica was produced, characterized by the hump-shaped spectrum. The infrared analysis confirmed that the silica had been successfully extracted from OPDCA by the presence of silica functional groups shown in the spectrum.
Technological Aptitude and Sensitivity of Lactic Acid Bacteria Leuconostoc Isolated from Raw Milk of Cows: From Step-by-Step Experimental Procedure to the Results Nora Hamdaoui; Yahya Rokni; Abdeslam Asehraou; Mohamed Mouncif; Zakaria Mennane; Abdelouadoud Omari; Asmae Sellam; Belkheir Hammouti; Mustapha Meziane
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.53730

Abstract

We demonstrated several technological aptitudes and sensitivity of lactic acid bacteria (Leuconostoc) isolated from the raw milk of cows. We explained the experiments in detail to get the reader to understand what kinds of technology can be used for testing bacteria. Lactic acid bacteria are used in the production of dairy products to increase their shelf life and improve their organoleptic and nutritional properties. Leuconostocs is a heterofermentative bacterium that produces lactic acid, acetic acid or ethanol, and carbon dioxide. A collection of 138 strains of lactic acid bacteria were isolated from the raw milk of cows in the region of eastern Morocco. 38 strains were identified as Leuconostocs. Their subspecies are 16 Mesenteroides, 11 Dextranicum, and 11 Cremoris. Our study was interested in the technological aptitude of this genus looking for the production of dextran and growth in milk with additional sunflower dye, as well as the acidifying, flavoring, thickening, coagulating, proteolytic activity in solid medium and Lipolytic activity. This work also consisted of studying the profile of the resistance and the sensitivity of these strains to antibiotics.
Potential Molecular Interaction of Nutmeg’s (Myristica fragrans) Active Compound via Activation of Caspase-3 Ronny Lesmana; Filza Yulina Ade; Yuni Susanti Pratiwi; Hanna Goeanawan; Nova Sylviana; Sandra Megantara; Susianti Susianti; Vita Murniati Tarawan; Purwo Sri Rejeki; Hamidie Ronald Daniel Ray; Unang Supratman
Indonesian Journal of Science and Technology Vol 7, No 1 (2022): IJOST: VOLUME 7, ISSUE 1, April 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i1.45663

Abstract

Myristica fragrans Houtt (belongs to the Myristicaceae family) is a Maluku Island (Indonesia) native plant. The seed of M. fragrans (Nutmeg) has been used for medicinal benefits. M. fragrans also has anti-cancer properties. The goal of this research was to use computer-aided drug design to investigate the in silico molecular docking of selected nutmeg compounds against Caspase-3. Molecular docking using Malegro Virtual Docker (MVD) software Ver 5.5 was performed to investigate binding complicated models to offer information on critical drug-receptor interactions. The most potent ligand was Licarin B, which had a docking score of -103.07 kcal/mol. The Licarin B structure formed several hydrogen bonds with Trp214 and Phe250. These findings imply that the nutmeg seed contains a prospective compound that could be a great anti-cancer agent.
Temperature Distribution in Bio Stove using Saw Dust: An Integrated Project-based Learning W. Wagiran; M. Mujiyono; Bayu Rahmat Setiadi; Yulianto Eko Wibowo; Fredy Surahmanto; Dendy Aqila Agata; Chinnathan Areeprasert
Indonesian Journal of Science and Technology Vol 8, No 1 (2023): IJOST: April 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i1.53476

Abstract

This paper aims at developing the potential of cellulose-based energy generation using pyrolysis, gasification, and combustion methods with biodegradable waste media. The cellulose-based material used in this study was sawdust. The sawdust was heated using a biomass stove, which was then analyzed in terms of heat conduction and propagation as well as temperature distribution. To ensure the effectiveness of sawdust as the main material in the biomass stove, sawdust particles were pressed and compacted under various pressure conditions. This experiment was integrated with the Project-Based Learning method through the following steps: (1) determination of projects testing, (2) project design, (3) project implementation schedules, (4) project completion and progress monitoring, (5) reports and presentations of project results, and (6) project evaluation. The results provide new findings that the denser sawdust particles correlate with the greater temperature and propagation rate. This can be obtained from the measured temperature distribution. Areas close to the heat source tend to have the same heat propagation. The density of the sawdust particle is the main key point for producing better pyrolysis and gasification process, in which it correlates with long combustion energy. Integrasi This finding opens a new concept and can be used as a reference for other researchers who develop research related to renewable energy from waste, especially when using a biomass stove.  This study also gives ideas for the need for developing project-based learning using the burning of sawdust using biomass stove as a tool for the teaching and learning process.
Biochar from Agricultural Waste for Soil Amendment Candidate under Different Pyrolysis Temperatures Abdul Mutolib; Ali Rahmat; Endra Triwisesa; H. Hidayat; Hari Hariadi; Kiki Kurniawan; S. Sutiharni; S. Sukamto
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.55193

Abstract

Indonesia as an agricultural country produces and consumes a huge amount of fruits. One of the popular fruits is durian (Durio zibethinus), which can create issues with the high amount of durian seeds. Durian seeds can be fermented quickly. Thus, if they are not processed immediately, it causes pollution to the environment, particularly an odor issue. One of the waste management is to convert durian seed waste into biochar, an ameliorant agent to improve soil quality. This study aims to analyze the physicochemical properties of durian seed-derived biochar under different pyrolysis temperatures. The results showed that the increases in the temperature allowed the creation of more porosity in the biochars, which is due to chemical structure and crystallinity arrangement. This is confirmed by the increases in surface area and total pore volume also decreases in particle size. The change in the chemical structure can be verified by the decreases in the biochar yield. The produced biochar from fruit seeds has excellent carbon content and elemental components such as potassium, magnesium, phosphor, and sulfur, informing prospective fruit seeds as a soil amendment fertilizer
e-book Multimedia Animation Implementation on Concept Mastery and Problem-Solving Skills of Crystal Structure Subjects in Engineering Materials Course Amay Suherman; Mumu Komaro; A. Ana
Indonesian Journal of Science and Technology Vol 8, No 2 (2023): (ONLINE FIRST) IJOST: September 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i2.55320

Abstract

This research is motivated by students’ difficulties in understanding abstract, complex, and dynamic concepts in the learning process of the Engineering Materials course. The course is very important because it is indispensable for advanced study program expertise courses. The purpose of the research is to analyze the impact of using the e-book Multimedia Animation (e-MMA) in the learning process of engineering materials courses on improving students’ learning outcomes in the crystal structure subject. The research used an experimental method with a randomized control group pretest-posttest design. Two groups were assessed from two classes in Engineering Department randomly selected as the research sample. The subject that becomes the focus of this study is Crystal Structure to understand Concept Mastery and Problem-solving aspects. Thus, there will be two competency data from the research results. The application of e-MMA in the learning process of engineering materials can improve student learning outcomes with an increase in the high category N-gain. The E-MMA is very effective in solving the problems of students in understanding crystal structure subject in engineering materials courses because of their ability to provide images and animations of abstract objects. Students can easily understand the concepts and formulas that exist in the crystal structure subject of engineering materials course

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