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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 5 Documents
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Search results for , issue "Vol. 3 No. 1 (2022): April" : 5 Documents clear
IN-SITU EXPERIMENT OF CROSS-FLOW SAVONIUS HYDROKINETIC TURBINE WITH A DEFLECTOR Satrio, Dendy; Wiyanto, Andreas Anthoni; M, Mukhtasor
Journal of Marine-Earth Science and Technology Vol. 3 No. 1 (2022): 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.v3i1.438

Abstract

The crossflow type Savonius turbine is capable to rotate at low current velocity conditions. The drawback of this turbine lies on its efficiency. This study aims to test its performance before implementation in the field. The research method used is an in-situ experimental study in Umbulan, Pasuruan. Turbine model T1 AR 1.145 without deflector is used, when TSR reaches a value of 0.824, it gets a CQ value of 0.327 and a CP value of 0.269. In the same model with deflector, when TSR reaches a value of 1.1, the CQ value is 0.251, and the CP value is 0.276. It can be concluded that this turbine is suitable for area with low current velocity.
THE EFFECT OF PICKING UNCERTAINTY WINDOW INTERVAL ON HYPOCENTER MICRO-EARTHQUAKE (MEQ) LOCATION USING GEIGER METHOD Utama, Widya; Ardhya Garini, Sherly; Sere Lansa, Fradana
Journal of Marine-Earth Science and Technology Vol. 3 No. 1 (2022): 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.v3i1.439

Abstract

Identification of the initial phase of the primary (P) waves at each seismic station is often inconsistent and implies the operator’s subjectivity, due to the high noise level. Errors in identifying the initial phase of the P waves can significantly bias the location of the hypocenter. In this study, the data used is one micro-earthquake (MEQ) event recorded by 8 seismic stations. At each seismic station, the P waves arrival time was measured repeatedly, to obtain the picking uncertainty time window interval of the P waves arrival time. The P waves arrival time data was processed using the Geiger method to obtain the MEQ hypocenter location. Based on the processing results, the determination of the arrival time of the P waves depends on the width of the time window and the amplitude scale used. The picking uncertainty time window interval will be narrower for arrival time observations with an enlarged time window and amplitude scale. Time window intervalin the range of 0,007-0,049 seconds, in this study significantly refracted the MEQ hypocenter location. The results of determining the location of the MEQ hypocenter using the Geiger method only produced two variants of the RMS error value with a difference of 0.001 seconds. However, the difference in the RMS error value is associated with a shift in the epicenter in the range of 2 – 21,1 meters and a shift in the elevation of the hypocenter in the range of 3-15 meters.
ANALYSIS OF THE FACTORS AFFECTING THE COST OF SHIP REPAIRS IN THE ISLAND OF JAVA AND KALIMANTAN Arif, Mohammad Sholikhan; Hutabarat , Darryl Oliver Benedict; Pribadi, Triwilaswandio Wuruk; Wahidi, Sufian Imam; Supomo, Heri; Pribadi, Sri Rejeki Wahyu
Journal of Marine-Earth Science and Technology Vol. 3 No. 1 (2022): 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.v3i1.449

Abstract

The national shipbuilding industry is primarily responsible for maintaining and repairing ships at ship repair facilities to ensure their seaworthiness. Each shipyard offers variable pricing for ship repair, mainly if the work is performed on different islands, in Java and outside of Java. By understanding the differences in ship repair costs between shipyards in Java and those outside of Java and the factors that influence these discrepancies, a ship owner can choose a repair shipyard for docking his vessel. Ship repair data were collected from shipyards in Java and Kalimantan, with data collection and direct surveys conducted at three Industries which are located in the island of Java, and three industries in Kalimantan Island, it is processed to determine the difference between the average cost of ship repairs at shipyards in Java Island and Kalimantan Island, revealing that the cost of repairing ships at shipyards in Java Island is higher than the cost of repairs at shipyards on Kalimantan Island. However, there are also increased costs associated with ship maintenance activities in shipyards in the island of Kalimantan. After processing the difference data, the identification of the factors that cause the difference in repair costs forms, and the identification results indicate that the difference in ship repair costs at the shipyards in Java and Kalimantan is influenced by differences in service costs, productivity figures, geographical location of the shipyards, supply chains. materials, as well as the completeness, quality, and capacity of repair support facilities at the shipyards.
STEP FORWARD FOR CFD UNCERTAINTY ANALYSIS OF SHIP RESISTANCE BENCHMARK MODEL LHI-007 Rina, Rina; Purnamasari, Dian; Dwi Yulfani, Rosi; Johar Alif Rahadi, Shinta
Journal of Marine-Earth Science and Technology Vol. 3 No. 1 (2022): 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.v3i1.450

Abstract

Computational Fluid Dynamics (CFD) is a tool for solving the basic problems of equations for model flow motion. The CFD application can be used to predict the magnitude of the ship's resistance which is related to the engine power needed to move the ship. Benchmarking is the process of comparing different methods, procedures, and physical models to provide a common basis for the validation of numerical methods. This study simulates the resistance test on the LHI 007 benchmark ship model using FINE™/Marine with speed ranges 1.63 m/s – 2.47 m/s at a temperature of 27°C. The purpose of this research is to complete the simulation approach and numerical uncertainty for the previous study. By adding a time step component to the verification and validation of the uncertainty analysis, the error value gets smaller than the validation value for various speeds 1.63 m/s, 1.8 m/s, 1.91 m/s and 2.02 m/s. It shows that validation was achieved.
POSITIONING EVALUATION WITH GNSS USING REALTIME PRECISE POINT POSITIONING METHOD FOR MINING MAPING SURVEY Wisnu Wardhana, Gunawan
Journal of Marine-Earth Science and Technology Vol. 3 No. 1 (2022): 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.v3i1.485

Abstract

Real Time Precise-Point Positioning (RT-PPP) is a relatively new method for satellite-based positioning or better known as the Global Navigation Satellite System (GNSS). RT-PPP has similarities with PPP in terms of data accuracy and precision because it was developed from the previous method called Precise Point Positioning (PPP). However, RT-PPP has an advantage in real time because it gets correction from the L-band in the Satellite Based Augmentation System (SBAS). This study aims to evaluate the RT-PPP method for mining surveys. The precision evaluation was carried out repeatedly for 7 days at specific points, while accuracy testing was compared with the static differential method at 11 points spread over the mining area. The results showed that the standard deviation of the RT-PPP method was 1.0 cm and 1.1 cm in the east and north, 3 cm in elevation. The accuracy test shows 17.5 cm for the RMSE horizontally and 6.2 cm vertically.

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