Jiangsu Maritime Institute

The study focuses on investigating the potential for co-combustion of ammonia and hydrogen in a gas turbine combustion chamber with steam injection, which can be used in decarbonized hybrid power systems of floating production, storage, and offloading (FPSO) units for oil products. The object of the study is the working processes in a gas turbine combustor of 32 MW capacity, operating on an ammonia-hydrogen fuel mixture. To evaluate the parameters of the fuel-burning device, a method was applied that represents the gas turbine combustor as a network of chemical reactors. A mathematical model of the combustor was developed, where individual reactors represent processes in the primary zone (taking into account steam injection), the mixing of steam with combustion products, and the mixing of secondary air with the main flow. A detailed kinetic mechanism comprising 160 reactions among 27 components was used to model the oxidation reactions of the ammonia-hydrogen mixture. The simulation resulted in new insights into flame propagation characteristics, temperature distribution, and the concentrations of major pollutants in the exhaust gases. Calculations were carried out under a pressure of 2.634 MPa. The obtained results may be useful for the engineering design of ship-based hybrid energy systems with zero carbon emissions.

Urban point source pollution has been effectively controlled in recent years; however, rainfall-driven non-point source (NPS) pollution has become a major contributor to the deterioration of urban water environments. This study focuses on the plain river network region of Wuxi City in the Taihu Basin, China. By integrating field monitoring with coupled model simulations, this study upscaled results from the experimental plot to the urban-scale river network, enabling analysis of the full processes of pollutant inflow and transport and evaluation of the role of rainfall in regulating these dynamics. Field monitoring in the experimental plot demonstrated a strong correlation between the temporal dynamics of NPS pollutant inflows and rainfall characteristics. Further analysis using model simulations in the river network area revealed that rainfall, maximum 1 h rainfall, and rainfall duration were identified as the primary drivers of pollutant inflows, while early drought duration, rainfall intensity, and variance between rainfall per unit time exerted non-linear effects. Specifically, when early drought duration was approximately 6–7 days or when rainfall intensity ranged from 2.1 to 2.6 mm/h, riverine nitrogen (N) and phosphorus (P) concentrations and pollutant loadings reached their peaks. In addition, when the deviation of unit-time rainfall from the event mean was between 1.8 and 2 mm, the duration of increase in pollutants entering the river was the longest. This study provides quantitative evidence highlighting the influence of rainfall characteristics on nitrogen and phosphorus dynamics in plain river network urban rivers. The findings offer valuable insights into the remediation of urban black-odor water bodies.

In this study, titanium oxide (TiO[Formula: see text] has been considered as an electrochromic material with great potential due to its low operating voltage, fast switching time and other advantages. The electrochromic device based on amorphous TiO 2 (Glass/FTO/TiO 2 /Electrolyte/NiO/FTO/Glass) has been prepared, and the effects of the electrochemical and electrochromic performance of the device are systematically explored by cyclic voltammetry. The electrochromic device at 450[Formula: see text]nm shows the largest transmittance modulation of 78% and the largest coloration efficiency of 137.3[Formula: see text]cm 2 /C. In addition, the prepared device exhibits uniform coloring without defect during electrochromism, which indicates that it has great development value in energy-saving, smart-window and other fields.

This study addresses the teaching challenges in International Cruise Stewardship Management by establishing an innovative “virtual-real integration and dual-track parallel” teaching model and four-dimensional integrated training system based on Digital Twin Technology, which achieves deep integration of job skills, courses, competitions, and certificates through 3D scenario simulation, intelligent learning, and school-enterprise collaborative training. Practical results demonstrate that this system significantly enhances students’ job competence and enterprise satisfaction, providing a replicable practical solution for the digital transformation of vocational education.

The cruise economy in China’s eastern coastal provinces exhibits significant differentiation: Shanghai has built a full industrial chain ecosystem centered on international cruise homeports, Liaoning Dalian focuses on cruise shipbuilding in northern China and serves as a node for the “Polar Silk Road,” while Hainan Sanya forms a distinctive model through the integration of South China Sea cruise tourism and duty-free consumption. By comparatively analyzing driving factors such as regional policies, industrial foundations, and consumer markets, this study reveals core bottlenecks restricting differentiated development, including insufficient local cruise shipbuilding capacity, homogeneous regional competition, and pressures from green transformation. Countermeasures are proposed through policy coordination, industrial upgrading, consumption innovation, and regional collaboration, aiming to transition the cruise economy in eastern coastal provinces from “scale expansion” to “quality enhancement.” This provides theoretical support and practical references for high-quality development of China’s cruise industry amid global market recovery.