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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 4 Documents
 1 
Search results for , issue "Vol. 6 No. 2 (2025): September" : 4 Documents clear
IMPACT TESTING OF SMAW WELDING CONNECTIONS ON A36 STEEL WITH VARIATION OF WELDING CURRENT Chris Jeremy Verian Sitorus; Alamsyah A; Uswah Pawara; Suardi S; Jusma Wahidah; Harlian Kustiwansa; Sri Leli Melenia; Cindy Lionita Agusty
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 Damian Raven Dewantara; I Ketut Aria Pria Utama
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) Abrila Delita Putri Siswanto; Aunurohim Aunurohim; Dian Saptarini
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.
MICROPLASTIC CHARACTERISTICS IN Amphibalanus amphitrite AS A POTENTIAL BIOINDICATOR IN THE WATERS AROUND THE SUROBOYO BRIDGE Rheina Nurhaliza; Aunurohim Aunurohim; Dian Saptarini
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

Abstract

Microplastics are small particles resulting from plastic degradation, typically ranging from 0.001 mm to less than 5 mm in size. This study aimed to determine the visual and polymer or chemical characteristics of microplastics found in barnacles Amphibalanus amphitrite collected from the waters surrounding the Suroboyo Bridge, as well as to evaluate their potential as a bioindicator species for microplastic pollution. A quantitative descriptive approach was applied, including visual identification of microplastics using a stereo microscope and chemical characterization using Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR). Barnacle samples were categorized into two size groups, namely small and large, to examine the relationship between barnacle size and microplastic characteristics. The average shell size of the large group was 2.88 cm, while the small group averaged 1.24 cm. The results showed that the average abundance of microplastics in the soft tissues of large barnacles was 61.93 particles per individual, while small barnacles contained 26.3 particles per individual. The dominant visual characteristics of microplastics in both groups were fragment shapes, blue coloration, and particle sizes ranging from 10 to 50 µm. Polymer analysis identified polypropylene and nylon as the main polymer types. Furthermore, this study highlights a clear relationship between barnacle size and microplastic accumulation, where larger individuals tend to accumulate higher quantities of microplastics. However, the size distribution of microplastics, ranging from 10 to 50 µm, was relatively consistent across both barnacle size groups, indicating that particle size is not strongly influenced by barnacle size but rather by environmental availability. These findings support the potential of Amphibalanus amphitrite as a bioindicator species for microplastic pollution due to its sessile nature and filter-feeding mechanism, which enable the accumulation of microplastics over time.

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