为制备高强度的石膏板材及制品,将我校对外检测及生产过程中产生的废弃蚕丝掺入石膏中,加入高效减水剂、缓凝剂,研究了不同长度和掺量的蚕丝石膏材料的力学性能。研究结果表明:9 mm 0. 3%、6 mm 0. 3%、6 mm0. 2%蚕丝的掺入对纯石膏的...为制备高强度的石膏板材及制品,将我校对外检测及生产过程中产生的废弃蚕丝掺入石膏中,加入高效减水剂、缓凝剂,研究了不同长度和掺量的蚕丝石膏材料的力学性能。研究结果表明:9 mm 0. 3%、6 mm 0. 3%、6 mm0. 2%蚕丝的掺入对纯石膏的力学性能提升尤为明显;加入萘系高效减水剂后,6 mm 0. 2%蚕丝石膏的力学性能优于其他两种蚕丝掺量及同长度同掺量玻璃纤维试件;加入聚羧酸高效减水剂后,9 mm 0. 3%蚕丝石膏14 d、28 d抗折、抗压强度均比其他两种蚕丝掺量石膏高,也均优于玻璃纤维3种掺量石膏的同龄期抗折、抗压强度。本研究结论可为工程界充分利用废弃蚕丝研发石膏制品提供有力数据支持,为蚕丝石膏复合材料在工程界的大量应用奠定基础。展开更多
This study selected the Sino-US route data from the top 30 global container liner companies between December 1,2019,and December 29,2019,as the data source utilizing the complex network research methodology.It constru...This study selected the Sino-US route data from the top 30 global container liner companies between December 1,2019,and December 29,2019,as the data source utilizing the complex network research methodology.It constructs a Sino-US container shipping network through voyage weighting and analyzes the essential structural characteristics to explore the network’s complex structural fea-tures.The network’s evolution is examined from three perspectives,namely,time,space,and event influence,aiming to comprehens-ively explore the network’s evolution mechanism.The results revealed that:1)the weighted Sino-US container shipping network exhib-its small-world and scale-free properties.Key hub ports in the United States include NEW YORK NY,SAVANNAH GA,LOS ANGELES CA,and OAKLAND CA,whereas SHANGHAI serving as the hub port in China.The geographical distribution of these hub ports is uneven.2)Concerning the evolution of the weighted Sino-US container shipping network,from a temporal perspective,the evolution of the regional structure of the entire Sino-US region and the Inland United States is in a stage of radiative expansion and de-velopment,with a need for further enhancement in competitiveness and development speed.The evolution of the regional structure of southern China and Europe is transitioning from the stage of radiative expansion and development to an advanced equilibrium stage.The shipping development in Northern China,the Western and Eastern United States,and Asia is undergoing significant changes but faces challenges of fierce competition and imbalances.From a spatial perspective,the rationality and effectiveness of the improved weighted Barrat-Barthelemy-Vespignani(BBV)model are confirmed through theoretical derivation.The applicability of the improved evolution model is verified by simulating the evolution of the weighted Sino-US container shipping network.From an event impact per-spective,the Corona Virus Disease 2019(COVID-19)pandemic has not fundamentally affected the spatial pattern of the weighted Sino-US container shipping network but has significantly impacted the network’s connectivity.The network lacks sufficient resilience and stability in emergency situations.3)Based on the analysis of the structural characteristics and evolution of the weighted Sino-US con-tainer shipping network,recommendations for network development are proposed from three aspects:emphasizing the development of hub ports,focusing on the balanced development of the network,and optimizing the layout of Chinese ports.展开更多
文摘为制备高强度的石膏板材及制品,将我校对外检测及生产过程中产生的废弃蚕丝掺入石膏中,加入高效减水剂、缓凝剂,研究了不同长度和掺量的蚕丝石膏材料的力学性能。研究结果表明:9 mm 0. 3%、6 mm 0. 3%、6 mm0. 2%蚕丝的掺入对纯石膏的力学性能提升尤为明显;加入萘系高效减水剂后,6 mm 0. 2%蚕丝石膏的力学性能优于其他两种蚕丝掺量及同长度同掺量玻璃纤维试件;加入聚羧酸高效减水剂后,9 mm 0. 3%蚕丝石膏14 d、28 d抗折、抗压强度均比其他两种蚕丝掺量石膏高,也均优于玻璃纤维3种掺量石膏的同龄期抗折、抗压强度。本研究结论可为工程界充分利用废弃蚕丝研发石膏制品提供有力数据支持,为蚕丝石膏复合材料在工程界的大量应用奠定基础。
基金Under the auspices of National Natural Science Foundation of China(No.41201473,41371975)。
文摘This study selected the Sino-US route data from the top 30 global container liner companies between December 1,2019,and December 29,2019,as the data source utilizing the complex network research methodology.It constructs a Sino-US container shipping network through voyage weighting and analyzes the essential structural characteristics to explore the network’s complex structural fea-tures.The network’s evolution is examined from three perspectives,namely,time,space,and event influence,aiming to comprehens-ively explore the network’s evolution mechanism.The results revealed that:1)the weighted Sino-US container shipping network exhib-its small-world and scale-free properties.Key hub ports in the United States include NEW YORK NY,SAVANNAH GA,LOS ANGELES CA,and OAKLAND CA,whereas SHANGHAI serving as the hub port in China.The geographical distribution of these hub ports is uneven.2)Concerning the evolution of the weighted Sino-US container shipping network,from a temporal perspective,the evolution of the regional structure of the entire Sino-US region and the Inland United States is in a stage of radiative expansion and de-velopment,with a need for further enhancement in competitiveness and development speed.The evolution of the regional structure of southern China and Europe is transitioning from the stage of radiative expansion and development to an advanced equilibrium stage.The shipping development in Northern China,the Western and Eastern United States,and Asia is undergoing significant changes but faces challenges of fierce competition and imbalances.From a spatial perspective,the rationality and effectiveness of the improved weighted Barrat-Barthelemy-Vespignani(BBV)model are confirmed through theoretical derivation.The applicability of the improved evolution model is verified by simulating the evolution of the weighted Sino-US container shipping network.From an event impact per-spective,the Corona Virus Disease 2019(COVID-19)pandemic has not fundamentally affected the spatial pattern of the weighted Sino-US container shipping network but has significantly impacted the network’s connectivity.The network lacks sufficient resilience and stability in emergency situations.3)Based on the analysis of the structural characteristics and evolution of the weighted Sino-US con-tainer shipping network,recommendations for network development are proposed from three aspects:emphasizing the development of hub ports,focusing on the balanced development of the network,and optimizing the layout of Chinese ports.
