Sustainable ammonia is one of the leading candidates in the search for alternative clean fuels for marine applications. This paper aims to build a simulation model of a six-cylinder, four-stroke diesel engine to investigate the effects of increasing the ammonia proportion in methanol–ammonia fuel blends on engine performance and emissions. In the present study, the conditions of different speeds and different proportions of ammonia in fuel blends are investigated. The results show that the average effective pressure, brake power, and brake torque increase by about 5% with an increased ammonia substitution ratio. In terms of economic performance, the changes under medium and low speed conditions are not obvious. However, the change in high speed conditions is significant. The brake specific fuel consumption (BSFC) is reduced by 6.6%, and the brake thermal efficiency (BTE) is increased by 4%. It is found that the performance of the engine is best at medium speed. The best performance is achieved with higher efficiency and lower emissions. The present results can provide guidance for the optimization of ammonia–methanol blends and their applications in engines.

With the continuous development of small and medium-sized electronic devices, which bring convenience to people’s lives, electromagnetic wave (EMW) pollution has emerged as a significant issue. The development of materials with electromagnetic interference (EMI) shielding capabilities for protection against harmful radiation plays a vital role. Currently, a wide range of multifunctional, lightweight EMI shielding materials have been created to address various environmental requirements. However, a single EMI shielding material has been difficult to meet the requirements of high-speed transmission of electromagnetic radiation of electronic equipment because when such devices operate at high speeds, they typically generate elevated temperatures, and excessive electromagnetic radiation further exacerbates heat accumulation, reducing both efficiency and lifespan. Therefore, thermal management is essential to lower operating temperatures and ensure optimal performance. Phase change materials (PCMs) are known for storing a large amount of energy, and have significant potential in thermal management, so flexible EMI phase change composites (PCCs) have emerged. This review provides a detailed examination of flexible EMI shielding materials based on various fillers, the potential of flexible PCMs in thermal management, and the latest advancements in developing new lightweight EMI PCCs. Finally, we suggest some potential research directions for flexible EMI shielding PCCs, hoping to contribute to the rapid advancement of next-generation flexible electronics, human thermal management, and artificial intelligence.

The extensional extruder is a novel method of polymer processing which generates high elongation stress within a polymer. A mathematical model is proposed which describes the velocity distribution during polymer processing in such an extruder. The modeling results indicate that the dimensionless velocity profiles for power-law fluids decrease as the power-law index increases. Overall, the extensional extruder has an advantage for dispersion effects over traditional screw extruders based on the extensional rheology.

A mathematical model is established to describe the effect of plant content on velocity field of plant fibers suspensions in extensional flow. Furthermore, the relationship of diagram between velocity field of plant fiber suspension flow and concentration of plant fiber is researched.

This study investigates dynamics of the melt conveying process in a novel extruder in which a polymer experiences a primarily elongational deformation field. The working principle of the novel extruder is completely different from that of conventional screw extruders. At the last stage of polymer processing in the proposed novel extruder, melt is conveyed through feeding and discharging processes. Here we present a mathematical model to analyze dynamics in the melt conveying process. Melt extrusion is primarily influenced by the position of vane chamber and the structural parameters of the novel extruder such as eccentricity.

An orientation distribution function is applied to describe the orientation distribution of polymer-fibers composites in shear-ellipsoidal extensional flow. And a mathematical model is established to simulate orientation distribution in this flow. Furthermore, the analytical solutions of differential equations on plant fibers orientation can be acquired in complex flow field. Therefore, analytical solution of differential equation on plant fiber orientation distribution is obtained.