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M. Uswah Pawara
Contact Email
uswah.pawara@lecturer.itk.ac.id
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+6285244317201
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ismatech.journal@itk.ac.id
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Gedung B306. Jl. Soekarno Hatta No.KM 15, Karang Joang, Kec. Balikpapan Utara, Kota Balikpapan, Kalimantan Timur 76127
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Kota balikpapan,
Kalimantan timur
INDONESIA
Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Published by Institut Teknologi Kalimantan
ISSN : -     EISSN : 3025518X     DOI : https://doi.org/10.35718/ismatech.v1i1
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
Focus and Scope Research titles encompassed by this journal include, but are not limited to: Naval Architecture: covering ship strength, Ship Hydrodynamics, Ship Construction, Ship Production Management, Wooden and FRP Ship Materials, Ship Design Innovation, Ship Vibration and Noise, Welding Technology, Fatigue, Sea Transportation, Computational Fluid Dynamic Modeling. Marine Engineering: encompassing Engine Performance, Renewable Fuels, Dual fuel system, Ship electricity, Ship Resistance, Ship piping systems, Ship reliability). Ocean engineering: Marine and Offshore Structures, Coastal Structures and Management, Port Structures and Management, Subsea Umbilicals, Risers and Flowlines (SURF), Ocean Renewable Energy, Marine Instrumentation, Marine Pollution. Mechanical engineering: addressing Tribology, Energy Studies, Engines and Turbines, Heat Transfer, Fluid Mechanics, Lubrication and Wear, Materials Science, Mechatronics, Refrigeration and air conditioning, Pressure analysis, Structural and mechanical design, Renewable energy, Structural mechanics, Thermodynamics, Materials processing, Vibration).
Arjuna Subject : Teknik (semua kategori) - Teknik Kelautan
Articles 65 Documents
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Development of River Port (Kelotok) In Penajam Paser Utara and Balikpapan by using BOR, LF, AHP and Triangulation Analysis Arief Hidayat; Johannes Diva Mahendra; Shintaro Terabe
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8482016

Abstract

The River Port in Penajam Paser Utara, East Kalimantan, serves as a vital transportation link connecting the coastal areas between Penajam Paser Utara and Balikpapan. Despite its strategic role, the port currently faces challenges, including limited berth capacity, insufficient supporting facilities, and low operational efficiency in River water transport services. This study, conducted in 2024, aims to analyze the operational characteristics of the River Port and transportation system, evaluate dock efficiency using the Berth Occupancy Ratio (BOR) and Load Factor (LF) methods, and determine infrastructure and service development priorities through the Analytic Hierarchy Process (AHP) approach. The research employs a quantitative, descriptive-analytical method that integrates primary and secondary data. The results show that the port’s operational performance requires improvement in dock utilization efficiency and passenger load distribution. Development priorities emphasize increasing transport capacity, optimizing service schedules, enhancing accessibility, and providing essential facilities such as comfortable waiting areas and improved safety systems. The findings highlight that sustainable River transportation development is crucial to supporting urban mobility and regional economic growth in East Kalimantan. Strategic recommendations from this study are expected to strengthen the competitiveness and reliability of River Port services.
Utilization of Egg Shell Powder as a Filler in Asphalt AC-WC (Asphalt Concrete-Wearing Course) Mixture on Air Flow and Absorption Characteristics Hijriah Hijriah; Syifa Fauziah; Priyo Wibisono; Ardiansyah Fauzi
Indonesian Journal of Maritime Technology Vol. 4 No. 1 (2026): Volume 4 Issue 1, June 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i1.8482100

Abstract

Asphalt Concrete-Wearing Course (AC-WC) is the surface layer of flexible pavement that directly receives traffic loads and protects the underlying layers from the effects of water and weather. The performance of AC-WC is strongly influenced by stability, Marshall flow, air voids, density, and resistance to water absorption. This study utilizes eggshell powder (ESP) as an alternative filler due to its high calcium carbonate content and its potential to fill voids between aggregate particles. The objectives of this study are to determine the optimum asphalt content, determine the optimum ESP content, and evaluate the effect of ESP variations on Marshall flow characteristics and water absorption of AC-WC mixtures. This research was conducted experimentally in the laboratory using ESP variations of 2%, 6%, and 10%. The tests included material characterization, aggregate gradation design, Marshall testing, determination of optimum asphalt content, and water absorption testing. The results show that the optimum asphalt content was 5.24%. The mixture with 6% ESP produced the most balanced performance, with a stability value of 2373.09 kg, Marshall flow of 3.53 mm, VIM of 4.51%, VMA of 20.20%, VFA of 77.67%, density of 2.36 g/cm³, MQ of 673.75 kg/mm, and the lowest water absorption of 0.495%. In terms of flow behavior, the 6% ESP mixture remained within the required specification range, indicating adequate flexibility without excessive deformation. In terms of water absorption, the 6% ESP mixture showed the best resistance to water ingress compared with the 2% and 10% ESP mixtures. The 2% ESP content was insufficient to produce a void structure that met the specifications, while the 10% ESP content tended to increase mixture stiffness and water absorption. Therefore, the use of 6% ESP has the potential to serve as an environmentally friendly alternative filler in AC-WC mixtures, particularly in improving the balance between Marshall flow characteristics and water absorption resistance.
The Effect of Nickel Ore Liquefaction on Ship Stability Fakhri Akbar Ayub; Fanny Darwani Putri
Indonesian Journal of Maritime Technology Vol. 4 No. 2 (2026): Volume 4 Issue 2, December 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i2.8482228

Abstract

Nickel ore liquefaction poses a critical threat to vessel stability because the cargo may transition from a solid to a fluid state, potentially causing rapid heeling and, ultimately, sinking. Under a substantial external shock, liquefied cargo may fail to return to its original position, thereby altering the cargo distribution and adversely affecting vessel stability and motion. Accordingly, this study investigates the effects of varying proportions of solid and liquid nickel ore, with the combined composition maintained at 100%, on the stability and motion characteristics of the MV Nur Allya. Five loading conditions were considered: 100% solid, 75% solid–25% liquid, 50% solid–50% liquid, 25% solid–75% liquid, and 100% liquid. Among these conditions, Case 1 produced the most favourable stability performance, with a maximum righting arm (GZ) of 1.064 m. To further mitigate the liquefaction hazard, a longitudinal bulkhead was incorporated into the cargo hold for all five loading cases. The results show a modest improvement in stability between Case 1 and Case 5 following the installation of the bulkhead. However, although the longitudinal bulkhead reduces the stability risks associated with cargo liquefaction, its installation also decreases the cargo-carrying capacity of the vessel, highlighting a trade-off between enhanced safety and cargo utilization.
Flexural Strength Characteristics of Composite Concrete Based on Pet Fiber and Fly Ash Hijriah; Fachreza Akbar; Andi Sahputra Depari; Muhammad Satria Ghesit
Indonesian Journal of Maritime Technology Vol. 4 No. 2 (2026): Volume 4 Issue 2, December 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i2.8482267

Abstract

Conventional Portland cement concrete production entails substantial carbon emissions, while the resulting matrix remains susceptible to microcracking. To mitigate these drawbacks, incorporating industrial by-products and recycled polymers offers a viable sustainable solution. This study investigated the flexural strength characteristics of eco-friendly concrete incorporating fly ash as a partial cement replacement at 15% by mass and recycled polyethylene terephthalate (PET) fibers at volume fractions of 0.25%, 0.5%, 0.75%, and 1%. A plain concrete mixture served as the control baseline. Flexural strength was evaluated using beam specimens at 28 days. The results showed that the optimum flexural strength was achieved at a PET fiber volume fraction of 0.25%, reaching 3.95 MPa. This value was higher than that of concrete containing 15% fly ash without PET fibers (3.02 MPa) and the plain concrete mixture (3.33 MPa). Increasing the PET fiber content beyond 0.25% resulted in a decline in flexural strength, with a value of 3.29 MPa at 1% PET fiber. The findings demonstrated that incorporating a low PET fiber content in fly ash concrete improved flexural strength, while excessive fiber content reduced flexural performance. These results highlight the potential of combining fly ash and recycled PET fibers as materials for developing more sustainable concrete.
Design and Development of an IoT-Based High-Temperature Monitoring System for Early Fire Detection in Ship Engines Using Thermocouple Suardi Suardi; Syahrul Gunawan Sitanggang; Faisal Mahmuddin; Abdul Basiq Zainal Abidin; Aung Ye Kyaw; A Ahmad Fauzan Ihsan; Novita Vadina Marta Ria
Indonesian Journal of Maritime Technology Vol. 4 No. 2 (2026): Volume 4 Issue 2, December 2026
Publisher : Naval Architecture Department, Kalimantan Institut of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/ismatech.v4i2.8482359

Abstract

The operational safety of ship engines is a vital aspect of the maritime industry. A major risk threatening vessel safety is fire caused by engine overheating. To mitigate this risk, a real-time temperature monitoring system capable of providing early warnings when temperatures reach dangerous thresholds is required. This research aims to design an Internet of Things (IoT)-based temperature monitoring system that tracks ship engine temperatures in real-time and transmits data to users via the Blynk IoT application. The system utilizes a K-type thermocouple temperature sensor connected to a MAX6675 module for accurate temperature readings. The sensor is interfaced with an Arduino Uno microcontroller, which transmits temperature data via serial communication to a NodeMCU ESP8266. The NodeMCU acts as the transmitter, sending data to the Blynk Cloud platform over a Wi-Fi connection. Additionally, the system features an I2C LCD to display real-time temperature readings and a buzzer to provide an audible alert if the temperature exceeds the set threshold. Test results demonstrate that the system effectively monitors ship engine temperatures in real-time, triggers a buzzer alert during overheating events, and consistently transmits temperature data to the Blynk application. Consequently, this system enhances vessel operational safety by effectively providing temperature information and early warnings to the crew.

Page 7 of 7 | Total Record : 65

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