Abstract.The decarbonization of maritime transport is accelerating the transition from conventional diesel-based propulsion to low- and zero-emission power systems. Fuel cells are increasingly regarded as a promising option for ferries, inland vessels, harbor craft, research vessels and other mission-defined ships because they convert chemical energy into electricity with high efficiency, low acoustic signatures and zero local carbon emissions when operated on hydrogen. Nevertheless, their deployment at sea remains constrained by slow transient response, stack degradation, hydrogen storage volume, … Read more →

Abstract.Aiming at the problems of low survival rate and weak mineralization activity of microorganisms in the high- alkali and high- shear environment of concrete, pine powder and nanomaterials were used as composite carriers to prepare Bacillus pasteurii microspheres by embedding method. The optimal culture conditions of microorganisms were determined by single factor experiments, the mix ratio of microspheres was optimized by orthogonal design, and systematic characterization was carried out from physical properties, mechanical strength, microscopic morphology and phase composition. The results show … Read more →

Abstract.Shipping underpins global trade, yet ship operations remain an important source of environmental pressure through oil pollution, exhaust emissions, ballast-water-mediated biological invasions, sewage, garbage discharge, antifouling-system releases, and biofouling-related ecological risks. Under the progressively strengthened framework of MARPOL, the Ballast Water Management Convention, the Anti-Fouling Systems Convention, and the IMO energy-efficiency and carbon-intensity requirements, ship pollution control is moving from isolated end-of-pipe treatment toward an integrated regime that … Read more →

Abstract.Liquefaction caused by earthquakes can affect the stability of underground structures. Numerical simulation of liquefaction is therefore necessary. By combining the modified Hardin-Drnevich soil constitutive model with Byrne's modified Martin pore pressure increment model, this paper develops an ABAQUS subroutine incorporating the modified Hardin-Drnevich soil constitutive model and the Byrne pore pressure increment model based on the implicit interface of ABAQUS. Numerical models in ABAQUS and FLAC3D are established respectively based on the undrained dynamic triaxial test results of Nanjing … Read more →

Abstract.With the rapid development of the shipping industry, pollution caused by shipboard oily wastewater has become an increasingly serious threat to marine ecosystems. Conventional physical, chemical, and biological treatment methods have limitations such as high energy consumption, unstable treatment performance, and potential secondary pollution when treating highly emulsified oily wastewater. To improve the electricity-generation and oily-wastewater-treatment performance of microbial fuel cells (MFCs), three anodes, namely CF, CeO₂/CF, and CeO₂-β-CD/CF, were prepared using carbon felt as the … Read more →

Abstract.This paper examines the behavior of a complex geometry (a 90-degree pipe bend) by undertaking a detailed analysis of the turbulent flow via computational fluid dynamics. k-ω Shear Stress Transport Navier-Stokes simulations with Reynolds number between 10,000 and 50,000 were done with Reynolds-Averaged Navier-Stokes simulations. Systematic mesh refinement was strictly used to achieve grid independence with a value of less than 3% as the Grid Convergence Index. The k-ω SST model showed better predictive power than conventional k-ε models with a mean absolute percentage error of 3.2% in … Read more →

Abstract.To investigate the interfacial bond behavior between steel plate-prestressed carbon fiber reinforced polymer (CFRP) sheets and concrete, a numerical model of the steel plate-prestressed CFRP sheet-concrete specimen was established via ABAQUS, and cohesive elements were adopted to simulate the nonlinear bond-slip characteristics of the interface. This study analyzed the influences of different prestress levels of CFRP sheets, bond lengths and CFRP sheet widths on the interfacial bond behavior between prestressed CFRP sheets and concrete in the single shear test model, as well as the bond-slip … Read more →