在全球气候变化和人类活动的双重压力下,海岸带正面临侵蚀加剧、生态退化和经济发展受阻等多重挑战。随着基于自然的解决方案(Nature-based Solutions,NbS)理念的推广,海岸防护与生态修复逐步融合,但与海岸带经济可持续发展之间的协同...在全球气候变化和人类活动的双重压力下,海岸带正面临侵蚀加剧、生态退化和经济发展受阻等多重挑战。随着基于自然的解决方案(Nature-based Solutions,NbS)理念的推广,海岸防护与生态修复逐步融合,但与海岸带经济可持续发展之间的协同机制仍有待深入探索。在此背景下,文章基于“活力海岸”进一步提出“复合活力海岸”(Complex Living Coast,CLC)理念,旨在统筹海岸安全、生态功能与经济发展,构建兼具“防灾减灾能力、生态系统活力、经济发展活力”的高质量海岸带发展模式。系统阐述了复合活力海岸的内涵与发展路径,并以厦门岛东北部海岸为例开展实证分析。结果表明,提升防灾减灾能力与实施生态修复工程可形成协同效应,不仅显著增强了生态系统服务功能,也有效带动了滨海旅游、高端休闲、会展经济及商业贸易等产业的发展,成功将生态优势转化为经济优势,实现了生态保护、防灾减灾与经济提升的有机统一。复合活力海岸理念为我国海岸带的高质量发展提供了一条以生态保护升级为核心的经济战略路径。展开更多
Metals obtain optimum conditions of metallurgical and physical properties through a heat treatment. Brass is one of the copper alloys which has many applications in everyday life and in the industry. Brass is one of t...Metals obtain optimum conditions of metallurgical and physical properties through a heat treatment. Brass is one of the copper alloys which has many applications in everyday life and in the industry. Brass is one of the copper alloys which has many applications in everyday life and the industry. In this work, the influence of the precipitation heat treatment temperature on the metallurgical microstructure, structure, thermal properties, and microhardness of an alpha brass is analyzed. Samples were heat treated by precipitation for 2 h at 300°C, 400°C, 500°C, 600°C, and 700°C. The best mechanical properties were found at 500°C of precipitation heat treatment temperature. Specimens were characterized by scanning electron microscopy, X-ray diffraction, Vickers microhardness, photothermal radiometry, and photoacoustic to study the thermal diffusivity and conductivity, as well as the heat capacity. The inverse of the full width at the half maximum analysis showed that the crystallinity decreased as the precipitation heat treatment temperature increased. Metallurgical microstructure and microhardness were correlated to the precipitation heat treatment temperatures to determine the effect on the metallurgical and mechanical properties, as well as the effect on the thermal properties of alpha brass.展开更多
Marine microplastics(MPs)are an increasingly important concern worldwide.This study aimed to investigate the occurrence and characteristics of microplastics in an intertidal sea snail,the common periwinkle(Littorina l...Marine microplastics(MPs)are an increasingly important concern worldwide.This study aimed to investigate the occurrence and characteristics of microplastics in an intertidal sea snail,the common periwinkle(Littorina littorea)sampled from Saint Martin's Island,Bay of Bengal.The results revealed that 100%of the common periwinkle snails ingested microplastics(MPs),with a mean abundance ranging from 2.63±1.07 to 23.89±3.53 MP/g(average:7.76±5.77 MP/g).Microplastic particles in the 100–1500μm size class were the most abundant(63%),whereas black and red fibers were the most abundant colors and shapes.Polypropylene(PP,34%)and polyethylene(PE,38%)were the major polymer types,followed by polystyrene(PS,15%)and polyethylene terephthalate(PET,13%).Although the polymer hazard index(PHI)showed risk categories Ⅲ to Ⅳ due to highly hazardous polymers such as PS and PE in the soft tissue of the common periwinkle snails,the pollution load index(PLI<10)revealed minor contamination across the sampling site of Saint Martin's Island.Gastropod feeding patterns and food items impacted MP abundance in the studied area.展开更多
文摘在全球气候变化和人类活动的双重压力下,海岸带正面临侵蚀加剧、生态退化和经济发展受阻等多重挑战。随着基于自然的解决方案(Nature-based Solutions,NbS)理念的推广,海岸防护与生态修复逐步融合,但与海岸带经济可持续发展之间的协同机制仍有待深入探索。在此背景下,文章基于“活力海岸”进一步提出“复合活力海岸”(Complex Living Coast,CLC)理念,旨在统筹海岸安全、生态功能与经济发展,构建兼具“防灾减灾能力、生态系统活力、经济发展活力”的高质量海岸带发展模式。系统阐述了复合活力海岸的内涵与发展路径,并以厦门岛东北部海岸为例开展实证分析。结果表明,提升防灾减灾能力与实施生态修复工程可形成协同效应,不仅显著增强了生态系统服务功能,也有效带动了滨海旅游、高端休闲、会展经济及商业贸易等产业的发展,成功将生态优势转化为经济优势,实现了生态保护、防灾减灾与经济提升的有机统一。复合活力海岸理念为我国海岸带的高质量发展提供了一条以生态保护升级为核心的经济战略路径。
文摘Metals obtain optimum conditions of metallurgical and physical properties through a heat treatment. Brass is one of the copper alloys which has many applications in everyday life and in the industry. Brass is one of the copper alloys which has many applications in everyday life and the industry. In this work, the influence of the precipitation heat treatment temperature on the metallurgical microstructure, structure, thermal properties, and microhardness of an alpha brass is analyzed. Samples were heat treated by precipitation for 2 h at 300°C, 400°C, 500°C, 600°C, and 700°C. The best mechanical properties were found at 500°C of precipitation heat treatment temperature. Specimens were characterized by scanning electron microscopy, X-ray diffraction, Vickers microhardness, photothermal radiometry, and photoacoustic to study the thermal diffusivity and conductivity, as well as the heat capacity. The inverse of the full width at the half maximum analysis showed that the crystallinity decreased as the precipitation heat treatment temperature increased. Metallurgical microstructure and microhardness were correlated to the precipitation heat treatment temperatures to determine the effect on the metallurgical and mechanical properties, as well as the effect on the thermal properties of alpha brass.
基金Research Cell,Noakhali Science and Technology University partially supported this study through project number NSTU/RC-OC-03/T-23/117.
文摘Marine microplastics(MPs)are an increasingly important concern worldwide.This study aimed to investigate the occurrence and characteristics of microplastics in an intertidal sea snail,the common periwinkle(Littorina littorea)sampled from Saint Martin's Island,Bay of Bengal.The results revealed that 100%of the common periwinkle snails ingested microplastics(MPs),with a mean abundance ranging from 2.63±1.07 to 23.89±3.53 MP/g(average:7.76±5.77 MP/g).Microplastic particles in the 100–1500μm size class were the most abundant(63%),whereas black and red fibers were the most abundant colors and shapes.Polypropylene(PP,34%)and polyethylene(PE,38%)were the major polymer types,followed by polystyrene(PS,15%)and polyethylene terephthalate(PET,13%).Although the polymer hazard index(PHI)showed risk categories Ⅲ to Ⅳ due to highly hazardous polymers such as PS and PE in the soft tissue of the common periwinkle snails,the pollution load index(PLI<10)revealed minor contamination across the sampling site of Saint Martin's Island.Gastropod feeding patterns and food items impacted MP abundance in the studied area.
