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Shanis Irsamayanti
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Journal of Marine-Earth Science and Technology
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 27745449     DOI : https://doi.org/10.12962/j27745449
Core Subject : Science,
Earth & Planetary Sciences Energy
In the fast-growing of science and technology of marine-earth related topics, we would like to launch a new international journal entitled MarineEarth Science and Technology Journal (JMEST). This journal is aimed as a media communication amongst scientists and engineers in the fields of marine and earth science and technology and will receive research and technical papers to be reviewed by our editors and reviewers. The JMEST issued three times a year and each issue consists of 5 (five) papers. The scope of the journal includes (but not limited to): Geology, Geophysics, Geochemistry, Atmospheric Science, Environmental Science, Hydrology, Geothermal, Marine Engineering, Marine Technology, Underwater Technology, Marine Renewable Energy
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Teknik Geologi dan Geologi Teknik
Articles 76 Documents
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EVALUATION OF THE VIABILITY OF TARIFFS BASED ON TRANSPORTATION EXPENSES FOR CATAMARAN RIVER SERVICES ON THE PARANGLOE - LAKKANG ROUTE Muh Yusril Syam; Ainun Chandra Puspa Nigrum
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i1.8782

Abstract

Establishing ship fares necessitates a thorough examination because it encompasses multiple cost factors, with fuel being the primary expense. For operators, it is crucial to determine fares that not only account for operational expenses but are also competitive and accessible for users of the service. This research investigates the viability of river transport fares using catamaran vessels on the Parangloe–Lakkang route, which can accommodate 12 passengers and 10 motorcycles, with a maximum of 8 vessels in operation. The aim of this research is to assess the minimum fare needed for the vessels to function sustainably by employing the Required Freight Rate (RFR) method, alongside evaluating passengers' ability and willingness to pay through the Ability to Pay (ATP) and Willingness to Pay (WTP) methodologies. The analysis reveals that the lowest minimum fare for passengers is Rp1.910/trip for vessel 3, while vessel 8 has the highest minimum fare at Rp2.442/trip. The ATP for passengers has been noted at Rp2.893/trip, whereas the WTP is recorded at Rp2.000/trip. These findings imply that the RFR fare falls between the WTP and ATP figures, indicating it is within a suitable range for fare policy. This result is significant as it provides a foundation for establishing sustainable fares and promotes enhancements in the quality of river transport services to ensure they are safer and more enjoyable for passengers.
SENSITIVITY ANALYSIS OF HYDROSTATIC PARAMETERS WITH RESPECT TO DISPLACEMENT CHANGES ON THE MINI BORNEO BARGE Romadhoni; Budhi Santoso; IKAP Utama
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i1.8783

Abstract

This study presents a systematic sensitivity analysis of key hydrostatic parameters keel to buoyancy distance (KB), metacentric radius (BM), and metacentric height (GM) with respect to incremental changes in displacement for the Mini Borneo barge. Utilizing only the vessel’s official stability booklet data, natural cubic splines were fitted to the discrete hydrostatic tables to reconstruct continuous functions for each parameter over the displacement range of 256.6t to 1641.0t. First derivative functions were then derived analytically and cross validated via centered finite difference, enabling high‐resolution evaluation of ∂KB/∂Δ, ∂BM/∂Δ, and ∂GM/∂Δ at 0.01 t increments. Results indicate that KB sensitivity peaks at a moderate load of approximately 436.6 t (0.00045 m/t), whereas BM and GM sensitivities reach their maxima at full‐load conditions near 1641.0 t (0.00086 m/t and 0.00092 m/t, respectively). Critical displacement intervals were identified around these peaks, highlighting narrow bands where small weight additions most profoundly affect stability. These findings inform the definition of safe‐loading envelopes and ballast‐management strategies, offering practical thresholds to maintain regulatory stability margins without the need for additional sea trials. The methodology is readily generalizable to other small craft equipped with hydrostatic booklets.
CONFIGURATION SELECTION METHOD WITH FUZZY DECISSION MAKING IN PREVENTION PORPOISING ON FLOATER N219 Alifia, Windha Umi
Journal of Marine-Earth Science and Technology Vol. 6 No. 1 (2025): April
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Porpoising leads to hull damage an inconvenience for passengers and crew in ship operations, especially ships with high Fn. Porpoising is one type of ship and floatplane instability. The choice of ship and floater configuration can prevent the occurrence of porpoising instability. Configuration selection using fuzzy logic method with multiple attribute decision making for 8 variables with 6 configurations of deadrise angle β and LCG longitudinal centre of gravity of a ship. Determination of objective configuration scenario and objective function for optimum configuration selection. Region or domain clustering is performed for each variable in all six configurations. Membership value assessment is carried out by entering the input of the configurations. Membership value assessment is carried out by entering the input of the configuration variable into the membership function to obtain the membership value or degree of the six configurations. For each variable, plotting is also carried out to the region in the existing region division. Configuration selection gets 2 alternatives, namely by clustering the best configuration of deadrise angle of 20° and LCG value of 55% and the configuration of deadrise.
IMPACT TESTING OF SMAW WELDING CONNECTIONS ON A36 STEEL WITH VARIATION OF WELDING CURRENT Sitorus, Chris Jeremy Verian; A, Alamsyah; Pawara, Uswah; S, Suardi; Wahidah, Jusma; Kustiwansa, Harlian; Melenia, Sri Leli; Agusty, Cindy Lionita
Journal of Marine-Earth Science and Technology Vol. 6 No. 2 (2025): September
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i2.4742

Abstract

This study aims to determine the effect of SMAW welding joints on impact strength and to determine the effect of impact loads on the fracture structure of ASTM A36 steel material. This research is based on welding theory, steel and electrode material theory, and impact testing theory. The determining factor of this research is the amount of welding current used. There is an increase in absorbed energy and impact strength for each variation of current, but this increase is not constant. Where at a strong current of 125 A there is an increase in E of 4.35 Joules and HI by 0.054375 J/mm2 compared to a strong current of 100 A. However, at a strong current of 150 A there is only an increase in E of 0.1 Joules, while for an increase in the value of HI by 0.00125 J/mm2 compared to a current of 125 A.
EFFECTS OF REAR PLANFORM CROPPING CONFIGURATION ON WING-IN-GROUND CRAFT Dewantara, Damian Raven; Utama, I Ketut Aria Pria
Journal of Marine-Earth Science and Technology Vol. 6 No. 2 (2025): September
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i2.8361

Abstract

Emissions from the global transportation sector represent a significant environmental challenge, with high-speed maritime transport being a notable contributor. The reduction of fuel consumption is therefore a critical objective in the development of future marine vehicles. The Wing-in-Ground (WIG) craft, an innovative transport modality developed since the mid-twentieth century, operates by utilising the aerodynamic ground effect to achieve aircraft-like speeds with substantially lower power requirements. This makes it a promising solution for efficient, high-speed maritime transit. A key innovation in WIG design is the Lippisch-style cropped reverse delta wing, a configuration known to enhance aerodynamic performance. To optimize this design, an investigation into the effects of rear planform cropping is required. This study employs computational fluid dynamics (CFD), utilising a Reynolds-Averaged Navier-Stokes (RANS) solver, to perform analysis of WIG models with various rear planform cropping configurations. The investigation covers trailing edge crop percentages of 0%, 10%, 20%, and 30% of the root chord. The results demonstrate that higher cropping percentages positively impact aerodynamic performance.
CHARACTERISTICS MICROPLASTICS AND ESTIMATED DAILY INTAKE (EDI) IN KUPANG PUTIH (Corbula faba Hinds.) AND KUPANG MERAH (Musculista senhousia) Siswanto, Abrila Delita Putri; Aunurohim, Aunurohim; Saptarini, Dian
Journal of Marine-Earth Science and Technology Vol. 6 No. 2 (2025): September
Publisher : Marine & Earth Science and Technology Research Center, DRPM, ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27745449.v6i2.9178

Abstract

Microplastics are plastic polymer particles smaller than 5 mm that can enter aquatic organisms through ingestion or trophic transfer. Bivalves are particularly vulnerable to microplastic contamination due to their filter-feeding behavior, which may pose potential risks not only to aquatic ecosystems but also to human health through seafood consumption. However, information on microplastic characteristics and human exposure assessment in locally consumed bivalves from the Madura Strait remains limited. This study aimed to analyze the physical and chemical characteristics of microplastics and to estimate human exposure using the Estimated Daily Intake (EDI) approach in two edible bivalve species, namely white mussel (Corbula faba Hinds.) and red mussel (Musculista senhousia), collected from the Madura Strait, Indonesia. A total of 30 individuals per species were analyzed. Physical characteristics of microplastics, including shape, size, and color, were observed using a stereomicroscope, while polymer types were identified using ATR–FTIR analysis. The EDI method was applied to estimate the potential daily intake of microplastics by humans through mussel consumption. The average microplastic abundance was higher in C. faba (104.6 ± 33.23 particles/individual) than in M. senhousia (53.46 ± 18.91 particles/individual). Fragment-shaped, black-colored microplastics with sizes of 10–50 µm were dominant in both species. Polypropylene (PP) and nylon or polyamide (PA) was the main polymer types identified. The estimated daily intake of microplastics was 1,067.24 particles/person/day for C. faba and 335.55 particles/person/day for M. senhousia. This study provides new insights by integrating microplastic characterization with human exposure assessment using EDI, highlighting the potential risks associated with bivalve consumption and supporting future environmental monitoring and food safety management.

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