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All Journal Indonesian Journal of Chemistry Unnes Journal of Public Health Automotive Experiences Journal of Mechanical Engineering, Science, and Innovation Molekul: Jurnal Ilmiah Kimia
Joddy Arya Laksmono
Pusat Penelitian Kimia, Lembaga Ilmu Pengetahuan Indonesia
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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Modeling Social, Health, and Vaccines Intervention in Time of Covid-19 Pandemic Impacted in Jakarta - Indonesia Setiawan, Arief Ameir Rahman; Susanto, Heru; Adjie, Firman Tri; Prasetiya, Hafiizh; Laksmono, Joddy Arya; Sulaswatty, Anny; Wiloso, Edi Iswanto; Hidayat, Dudi
Unnes Journal of Public Health Vol 10 No 1 (2021): Unnes Journal of Public Health
Publisher : Universitas Negeri Semarang (UNNES) in cooperation with Association of Indonesian Public Health Experts (Ikatan Ahli Kesehatan Masyarakat Indonesia (IAKMI))

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ujph.v10i1.43065

Abstract

Since the first outbreak of SARS-CoV-2 worldwide, research on modeling and simulation has grown, particularly to estimate the peak and end time of the pandemic which has been exceeded in some cases. This study aims to model the current virus spread with discrete event simulation, using the case of Jakarta. About 2 million of Jakarta's susceptible population was used for the the model's input which ran for a year. The data was obtained from past records and were divided into three main timelines (i.e. initial stage, large scale restriction and new normal) in order to validate the model with real cases step by step. Scenario analysis was then performed by evaluating five possible interventions such as: existing scenarios, social and health intervention, mass vaccination and hybrid intervention. The results show that the model represents real cases with a variation of less than 5% during the timeline. Furthermore, scenario analysis showed that mass vaccination, hybrid and social intervention provide the least positive cases in the system. This study recommends that hybrid intervention should be used while the vaccine is being mass produced, and the implementation of social intervention should be highlighted.
Recent Development in LiFePO4 Surface Modifications with Carbon Coating from Originated Metal-Organic Frameworks (MOFs) to Improve the Conductivity of Cathode for Lithium-Ion Batteries: A Review and Bibliometrics Analysis Shieddieque, Apang Djafar; Rahayu, Iman; Hidayat, Sahrul; Laksmono, Joddy Arya
Automotive Experiences Vol 6 No 3 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9524

Abstract

Using lithium-ion batteries has emerged as a viable approach to lessen the negative effects of fossil fuel use. LiFePO4 (LFP) is one of the lithium-ion batteries that are eco-friendly and safer than others. However, LFP has a main limitation with the poor rate performance due to its low electronic conductivity number. This study aims to present a bibliometric review of the analysis using VOSviewer of surface modification using carbon coating of metal-organic frameworks (MOFs) to improve the challenge of synthesis, structure, electrochemical stability, and performance of LFP. The results of this study showed that surface modification of LiFePO4 electrodes using carbon compounds produced from MOFs improved the efficiency of electrochemical energy storage and conversion technologies. High levels of porosity and customizable characteristics are offered by metal-organic frameworks (MOFs) ideal for surface modification which improves the battery conductivity. The bibliometric analysis showed that research on lithium-ion batteries is currently receiving attention, a sign of its significance and rising popularity. It is suggested for researchers especially Indonesian researchers to contribute more to this field.
Effects of UV Exposure on the Physical, Chemical, and Mechanical Properties of Silica Microballoon Reinforced Epoxy Composites Yunus, Muhammad; Ardhyananta, Hosta; Hidayat, Mas Irfan Purbawanto; Rosidah, Afira Ainur; Laksmono, Joddy Arya; Jayatin, Jayatin; Susanti, Diah; Wijaya, Ade Mundari
Journal of Mechanical Engineering, Science, and Innovation Vol 4, No 1 (2024): (April)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2024.v4i1.6159

Abstract

Epoxy-based composites are widely used in various applications due to their excellent mechanical properties and durability, but their performance under prolonged UV exposure remains a critical concern. This study examines the impact of UV exposure on the physical, chemical, and mechanical properties of epoxy-silica microballoon composites over curing periods of 0, 200, and 400 hours. Results indicate that UV treatment increased the density from 1.0073 g/cm³ to 1.0129 g/cm³. SEM images showed a reduction in fragmentation of epoxy microballoons, indicating stronger bonding. EDX results revealed some changes in elemental composition, with a notable decrease in the percentage of sodium from 0.81 wt.% to 0.18 wt.% and silicon from 7.16 wt.% to 0.12 wt.%. FTIR analysis identified a new hydrogen bond formations at 3350 cm⁻¹. Mechanical testing showed that UV treatment significantly increased the flexural stress from 36.83 MPa to 49.98 MPa. Additionally, hardness (Shore D) increased from 78.4 to 80.2 Shore D. These findings highlighted the significant effects of UV exposure on the structural integrity and bonding mechanisms of the composites, offering valuable insights for their use in UV-prone environments.
Cold Plasma-Induced Surface Modification of Microfibrillated Cellulose Using Lauric Acid to Enhance Compatibility in Polymer Composites Rifathin, Annisa; Wijaya, Ade Mundari; Roziafanto, Achmad Nandang; Laksmono, Joddy Arya; Nugraha, Adam Febriyanto; Chalid, Mochamad
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104738

Abstract

Green materials, such as microfibrillated cellulose (MFC), are increasingly used as fillers in polymer composites for academic and industrial applications. However, their inherent hydrophilic property limits compatibility with polymer matrix. This study employs an environmentally friendly cold plasma technique to modify the surface of MFC, improving its compatibility with the polymer. Plasma treatment was performed at a voltage of 60 V for 30 min by making three molar ratios (3:1, 4:1, and 5:1) between lauric acid as a hydrophobic precursor and anhydroglucose (AGU). The results indicate several changes in the modified MFC properties, as evidenced by the appearance of a new peak at a wavenumber of 1742 cm−1 (ester’s C=O) in FTIR spectra, indicating successful plasma-induced grafting. XPS results also confirm the formation of O–C=O bond at a binding energy of 289.3 eV. The optimum conditions were obtained at a molar ratio of 4:1 (lauric acid:AGU). There was a decrease in the hydrophilic property of MFC, indicated by an increase in the water contact angle from 50.16° to 71.26°. Moreover, the surface tension difference between MFC and polypropylene was significantly reduced from 136.99 to 47.51%, suggesting improved compatibility.
Study on Properties Influence of Carbon Fiber-reinforced Polyimide Composites using Melamine as a Crosslinking Agent Shiediqque, Apang Djafar; Widarman, Agung; Suriaman, Irwan; Zahra, Ghefira Iftina; Maesaroh, Kiki; Edwin, Rudiawan; Laksmono, Joddy Arya
Molekul Vol 20 No 1 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.1.13317

Abstract

ABSTRACT: Advances in carbon fiber reinforced polymer (CFRP) technology remain critical, particularly in meeting the demand for lightweight and durable materials in the transportation industry. With the advent of electric vehicles (EVs), there is a pressing need for composite materials that offer not only exceptional mechanical strength but also high-temperature stability and heat resistance. Polyimide, known for its excellent heat resistance and flame retardancy properties, is an optimal choice for developing such composites. Furthermore, the incorporation of melamine as a crosslinker in polyimide has been shown to significantly enhance its performance. Our study involved the production of a carbon fiber reinforced composite with a melamine crosslinked polyimide matrix (CFMPI), to meet these critical requirements. The composite showed a tensile strength of 84.17 MPa, a tensile modulus of 1899.14 MPa at 1.5% mole substitution of 4,4’‑oxydianiline by melamine as a crosslinker for polyimide with thermal stability up to 562 °C. These results indicated that this composite material is highly suitable for use in EVs. Keywords: advanced composites, carbon fiber reinforced polymer, lightweight materials, melamine-crosslinker, polyimide composites.
Co-Authors Achmad Nandang Roziafanto, Achmad Nandang Adam Febriyanto Nugraha Adjie, Firman Tri Afira Ainur Rosidah Anny Sulaswatty, Anny Diah Susanti Dudi Hidayat Edwin, Rudiawan Heru Susanto Hidayat, Mas Irfan Purbawanto Hosta Ardhyananta Iman Rahayu Hidayati Soesanto Jayatin Jayatin, Jayatin Maesaroh, Kiki Mochamad Chalid Muhammad Yunus Prasetiya, Hafiizh Rifathin, Annisa Sahrul Hidayat Setiawan, Arief Ameir Rahman Shieddieque, Apang Djafar Shiediqque, Apang Djafar Suriaman, Irwan Widarman, Agung Wijaya, Ade Mundari Wiloso, Edi Iswanto Zahra, Ghefira Iftina