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All Journal Borneo Engineering : Jurnal Teknik Sipil International Journal of Applied Technology Research
Mauludin, Luthfi Muhammad
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Design of Hybrid Energy System for Railway Application (Case Study of People Mover System in Doha, Qatar) Nugroho, Sri; Mauludin, Luthfi Muhammad; Sirait, Togar; mujiman, mujiman; Sofyan, Ahmad; Tohir, Toto
Jurnal Internasional Penelitian Teknologi Terapan Vol 4 No 1 (2023): April 2023
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v4i1.112

Abstract

This paper presents the conceptual design of hybrid energy system used in railway application. The hybrid system with batteries and energy storage double-layer capacitor is a new technology that is used under extreme climatic conditions, especially in daytime temperature up to 50°C, high relative humidity, dust and heavy rain. It is a combination of double-layer capacitors and traction batteries. It draws power both externally and from braking energy. In order to reduce CO2 emissions to the environment, energy-saving drives and energy storage are used. Also, in public transportation, Sitras Hybrid Energy System (HES), hybrid energy storage system for trams, has been developed which combines a double-layer capacitor with a nickel-metal hydride battery. The storage not only allows driving without overhead lines, it also enables braking energy to be recovered. A reliable cooling system is required to ensure that the performance of the battery and the capacitor storage is maintained for as long as possible. The results of finite element model showed the robustness for railway application. The computational model refers to proof of static and dynamic strength in accordance with EN12663. A cooling system for a tram using this innovative technology was designed and qualified for the "Qatar Education City People Mover System (PMS)" project.
Kuat Tekan Self-Healing Concrete Berbasis Enkapsulasi Xanthan Gum Hafizh, Muhammad; Mauludin, Luthfi Muhammad; Keryanti, Keryanti; Susanto, Ambar
Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 3 Tahun 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v8i3.5877

Abstract

This study aims to determine the reaction and performance of self-healing concrete using Bacillus megaterium encapsulation with xanthan gum coating through a simple extrusion method. The focus of the study is on the effect of adding xanthan gum microcapsules on the compressive strength of concrete and determining the optimal microcapsule content. The percentage of xanthan gum microcapsules used is 1,2,3,4, and 5%. Based on the test results, the addition of 2% xanthan gum microcapsules provides the highest compressive strength, which is 25.6 MPa on the 7th day and 34.1 MPa on the 28th day. Further test results show that although the addition of 5% microcapsules provides the greatest strength return, the use of higher amounts of microcapsules actually reduces the overall concrete strength. Therefore, the optimal microcapsule content to be added to the concrete mixture is 2%, which provides the best balance between increasing strength and material stability.
Co-Authors Ahmad Sofyan Ambar Susanto, Ambar Keryanti, Keryanti Muhammad Hafizh Mujiman Mujiman, Mujiman Sirait, Togar Sri Nugroho Toto Tohir