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Sensitivity of Tropical Cyclone Intensity and Structure to Vertical Resolution in WRF
Zhanhong Ma,Jianfang Fei,Xiaogang Huang,Xiaoping Cheng 한국기상학회 2012 Asia-Pacific Journal of Atmospheric Sciences Vol.48 No.1
In this paper the impacts of vertical resolution on the simulations of Typhoon Talim (2005) are examined using the Weather Research and Forecasting (WRF) model, with cumulus parameterization scheme representing the cumulus convection implicitly. It is shown that the tropical cyclone (TC) track has little sensitivity to vertical resolution, whereas the TC intensity and structure are highly sensitive to vertical resolution. It is partly determined by the sensitivity of the planetary boundary layer (and the surface layer) and the cumulus convection processes to vertical resolution. Increasing vertical resolution in the lower layer could strengthen the TC effectively. Increasing vertical resolution in the upper layer is also beneficial for the storm intensification, but to a lesser degree. In contrast, improving the midlevel resolution may cause the convergence of environmental air,which inhibits the TC intensification. The results also show that the impacts of vertical resolution on features of the TC structure, such as the tangential winds, secondary circulations and the evolution of the warm-core structure, are consistent with the impacts on the TC intensity. It is suggested that in the simulations of TCs, the vertical levels should be distributed properly rather than the more the better,with higher vertical resolution being expected both in the lower and upper layer, while the middle layer should not hold too many levels.
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Sunfang Chen,Dan Cai,Qi Dong,Gaoxiang Ma,Chennan Xu,Xiaogang Ba,Wei Yuan,Bing Wu,Bin Fang 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background The reconstruction of tendons with large defects requires grafts with high mechanical strength and is often hindered by complications such as infection and adhesion. Hence, grafts combining the advantages of mechanical resilience and antibacterial/antiadhesion activity are highly sought after. Methods The silver nanoparticles (GA-Ag NPs) synthesized from gallic acid and silver nitrate were attached to a decellularized extracellular matrix (Decellularized Tendon crosslinking GA-AgNPs, DT-Ag). We examined the histological structure, mechanical property, morphology, Zeta potential, cytotoxicity, antibacterial properties, antioxidant and anti-inflammatory properties, and ability of the DT-Ag to treat tendon defects in animals. Results Approximately 108.57 ± 0.94 μg GA-Ag NPs loaded per 50 mg DT, the cross-linked part of GA-Ag NPs was 65.47 ± 0.57%, which provided DT-Ag with long-lasting antibacterial activity. Meanwhile, GA endowed DT-Ag with good antioxidant and anti-inflammatory activities. Additionally, The DT-Ag facilitated M2 macrophage polarization, and suppressed fibrin deposition by hindering fibroblast adhesion. Mormore, the main advantages of DT-Ag, namely its long-lasting antibacterial activity (tested using Escherichia coli and Staphylococcus aureus as models) and the ability to prevent tissue adhesion were confirmed in vivo. Conclusion The fabricated multifunctional tendon graft was highly hydrophilic, biocompatible, and mechanically resilient, and concluded to be well suited for dealing with the main complications of surgical tendon reconstruction and has bright application prospects.
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Key Construction Technology and Monitoring of Long-Span Steel Box Tied Arch Bridge
Jianpeng Sun,Jinbin Li,Yingbiao Jiang,Xiaogang Ma,Zihan Tan,Gaolin Zhufu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
As a composite system bridge, half-through steel box tied arch bridge combines the arch mainly bearing pressure and the beam mainly bearing bending moment, gives full play to their respective advantages, and has the two characteristics of large span capacity of arch bridge and strong adaptability of simply supported beam bridge to foundation. However, in the construction process, due to the complex construction technology and structural stress behavior, the hoisting of arch rib, the tensioning of tie rod and suspender are accompanied by the change of internal load, which is a challenge for bridge construction. Taking the Lancang River Liming Bridge in Xishuangbanna, Yunnan Province as an example, this paper introduces a new construction scheme of arch bridge, introduces the structural characteristics of cable hoisting system, and puts forward the construction monitoring method. The response of arch rib, suspender, tie rod and main beam is monitored by health monitoring system and compared with the analysis results of finite element model to ensure that the stress and deformation of the structure under various working conditions are in a reasonable state. The results show that the proposed construction scheme can meet the safety and quality requirements of bridge construction, and the finite element model can reasonably predict the bridge behavior in construction. This study is expected to promote the construction of long-span half through steel box tied arch bridge.
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