A Route Planning Method for Small Ships Based on Historical AIS Data

Abstract Route planning for small ships involves unique considerations, as these ships often operate in restricted and dynamic maritime environments such as marinas and shallow depth areas. Due to the complexity and limited depth of such areas, ensuring safe and reliable routes is critical. Conventional optimization-based methods for route planning tend to focus on economic […]

Welding residual stress of curved plate: Development of empirical formula for predicting ultimate compressive strength

Abstract This study presents an empirical formula for predicting the ultimate compressive strength of curved plates incorporating welding-induced defects, with the objective of enhancing structural design for Ocean Mobility applications. The proposed formula uniquely considers both initial deflection and welding residual stress, two major sources of imperfection. It introduces the plate slenderness ratio (β) and […]

Development of a one-dimensional dynamic model of proton exchange membrane electrolysis cell

Abstract Proton exchange membrane water electrolysis is a key technology for hydrogen production, particularly when powered by renewable energy. To ensure operational stability under fluctuating power inputs, this study develops a one-dimensional dynamic model of a cell. Unlike previous models that primarily focus on steady-state behavior or empirical tuning, the proposed model integrates mass, momentum, […]

Numerical Study of Slamming Loads on Bow Flare of FPSO Model by Irregular Waves

Abstract Numerical studies were performed to investigate bow flare slamming loads under irregular waves. To estimate the slamming forces in the simulations, two time windows were selected based on existing experimental data. This study examined horizontal and vertical slamming phenomena by analyzing the relationship between the motions and the resulting slamming forces. The horizontal and […]

Enhanced virucidal activity of facet-engineered Cu-doped TiO2 nanorods under visible light illumination

Abstract Crystal facet engineering has emerged as a promising approach to enhance photocatalytic activity of semiconductors by preferentially accumulating charge carriers (electrons and holes) on specific facets. This facilitates efficient electron and hole transfer across the semiconductor/cocatalyst interface, enabling their transport to the cocatalyst surface for redox reactions. In this study, three Cu-doped TiO2 nanorods with […]

Dynamic modeling of alkaline water electrolysis cell with consideration of two-phase bubble transport for renewables dedicated operation

Abstract A one-dimensional dynamic model has been developed to analyze the dynamic characteristics of alkaline water electrolysis (AWE) in response to variable load changes. In the model, the control volume is discretized in a perpendicular direction according to the general zero-gap alkaline water electrolysis cell configuration. Dynamic conservation equations are applied to resolve the mass […]

Advancing membrane carbon capture in liquefied natural gas-fueled ships via upper bound theory and multi-objective optimization for CO2/O2 separation

Abstract The commitment of the shipping industry to reduce greenhouse gas emissions has spurred interest in onboard carbon capture solutions for liquefied natural gas (LNG)-fueled ships, which generate exhaust with low CO2 and high O2 contents. Membrane-based carbon capture is a promising alternative to bulky amine scrubbing. However, the critical challenge of CO2/O2 separation in O2-rich exhaust has been largely overlooked in prior studies. […]

Techno-economic and environmental evaluation of onboard carbon capture and storage system through heat integration and solvent selection

Abstract Onboard carbon capture and storage (OCCS) systems have garnered attention as attractive solutions to reduce greenhouse gas (GHG) emissions from marine sector. However, the high energy demands for solvent regeneration remain a major challenge. To address this issue, this study proposes an OCCS system that utilizes compression heat recovery from a CO2 liquefaction system in […]

Eco-techno-economic analysis of onboard membrane carbon capture and storage systems considering CO2/N2 and CO2/O2 selectivity improvements

Abstract The shipping industry aims to achieve net zero emissions, and compact-sized membrane-based onboard carbon capture and storage systems can be a feasible solution. However, most previous studies have overlooked the importance of CO2/O2 separation performance, leading to higher energy consumption and operating expenditures. In this study, a three-stage membrane carbon capture system was integrated with […]

CFD analysis on hydrodynamic characteristics of ultra-high-pressure water jets: stationary vs. translating nozzle conditions

Abstract In the rust removal process via ultra-high-pressure (henceforth UHP) water jet, nozzle translation and rotation significantly affect the jet profile, thereby influencing rust removal performance. Unfortunately, the research on UHP water jets in motion is still rare, lacking systematic theoretical analysis. To address this, 3D numerical simulations incorporating cavitation effect, multiphase flow, and liquid […]