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The purpose of this paper is to obtain high-performance ceramics and enrich additive manufacturing of ceramic parts. Also, a new manufacturing technique based on slurry by selective laser melting (SLM) was studied, which has some significant advantages compared to indirect selective laser sintering of ceramic powders.

To study the effect of laser parameters on the surface morphology and melting state of pure Al₂O₃ ceramics, laser power varied between 100 and 200 W and scan speed varied between 60 and 90 mm/s.

Experimental results show that Al₂O₃ slurry melts completely when the laser power is about 200 W and the scanning speed is 90 mm/s. Surface quality cannot be improved effectively by changing the scanning speed. However, surface quality improves when the laser power is 200∼205 W and energy density is 889∼911 J/mm³. Thermocapillary convection was observed during SLM. By changing the temperature gradient, streak convection and flowing Bénard cells were obtained during SLM of Al₂O₃ slurry.

It is feasible to produce slurry ceramic parts without binders through SLM. Increasing the laser power is the most effective way to fully melt the ceramics. Complex thermocapillary convection was observed during this new process; it may be used to produce crystals.

This study explores how sustainable community participation can be fostered in urban regeneration projects, particularly focusing on improving stakeholder engagement and ensuring equitable collaboration. The study aims to provide insights into who will benefit from these factors, specifically considering community members and policymakers. While cooperative decision-making has been a focus of recent studies, challenges such as ineffective cooperation strategies and unequal interest distribution among stakeholders remain important barriers. A comprehensive and systematic review of existing research is needed to inform future research in this area.

The study employed the PRISMA-ScR checklist in a comprehensive scoping review and created an evaluation framework based on 126 journal papers. The framework comprises three categories of studies that examine community participation in the context of urban regeneration projects: (1) policies and strategies, (2) community participation methods and (3) sustainable approaches.

The in-depth review of these 30 selected articles revealed several potential ways to examine the mechanisms and interactions related to stakeholders’ engagement for community participation in urban regeneration projects. The findings suggest that sustainable community participation strengthens long-term community involvement and project success by fostering a sense of ownership. The review also identified limitations in current research and proposes concrete future research directions.

This study provides a roadmap for researchers and policymakers, offering strategies to improve collaborative decision-making in urban regeneration. It offers actionable insights for enhancing sustainable community participation and informs the development of effective policies in urban regeneration projects.

With the increasing demand for lightweight parts, the quality of the inner structure gained growing attention from different kinds of fields. As the quality of the overhanging surface was one of the most important factors affecting inner structure formation, its quality still needs to improve. This paper aims to clarify the change of the overhanging surface quality caused by different bending angles.

The structure of the inner hole was redesigned according to the different performances of the overhanging and side inner surface. The experimental results revealed why different surface qualities can be seen under different bending angles. According to the experimental data, the inner structure was redesigned to increase its overall performance.

The results revealed that when the bending angle was small, the slope of the overhanging surface increased which lead to the decreasing length of the powder-supported layer. However, less space on bending angle resulted in the accumulation of unmelted powder which leads to the increasing of sinking distance. When the bending angle was too large, the slope of the overhanging surface decreased and the length of the molten pool which was supported by powder increased. It resulted in the sinking of the molten pool caused by the gravity of powder and its attachment.

This paper is the first work to study the relationship between bending angle and overhanging surface quality as far as the authors know. The different performances of left and right overhanging surfaces also have not been revealed in other research studies to the best of the knowledge.