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RISS 인기검색어
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- 저자 : Haiying Lu (검색결과 4 건)
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Progressive Collapse Behavior of Large-span Truss String Structures Subjected to Cable Failure
Haiying Zhang,JinYu Lu,Xiaolong Wu,Na Li 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
Cables play an important role in truss string structures, and their sudden failure can lead to massive damage and even collapse of the structures. This paper studies the dynamic response of a 72 m span truss string structure, the progressive collapse numerical simulation of the structure is carried out under different load conditions, the displacement and force responses of the structure after cable failure are investigated, the dynamic amplification factor is calculated, and the collapse mechanism is revealed. The effect of individual factor changes on the structural response is analyzed and compared. Results showed that after cable failure, the stress state of the upper truss changed from an arch to a simply supported beam, when reaching collapse load, the structure collapsed within 5s instead of reaching new equilibrium positions. Moreover, the structure with stiffer elastic support exhibited higher resistance to collapse. The critical member of the truss, which first buckled under compression, shifted from the mid-span to the lower chord at the end, leading to rapid structural collapse. Increasing the cable's cross-sectional area can hardly reduce the structure's dynamic response. However, when the instantaneous failure time of the cable exceeded 0.1s, a significant alleviation of the structure's dynamic response was observed.
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Advances in the Development of Anti-Adhesive Biomaterials for Tendon Repair Treatment
Zhou Haiying,Lu Hui 한국조직공학과 재생의학회 2021 조직공학과 재생의학 Vol.18 No.1
Peritendinous adhesion that simultaneous with tendon healing link the healing tendon to the surrounding tissue. It results in functional disability, and has a significant adverse impact on health as well as social and economic development.Based on a search in the PubMed and Web of Science database, the research articles were screened by their time, main idea, impact factor index, while the ones with no credibility were excluded. Afterwards, we go through the analysis of the reliability and characteristics of the results were further screened from selected articles.A total of 17 biomaterials used to evaluate the adhesion mechanism and the properties of the material were found. All of these biomaterials contained randomized controlled studies and detailed descriptions of surgical treatment that support the reliability of their results which indicates that biomaterials act as barriers to prevent the formation of adhesion, and most of them exhibit satisfactory biocompatibility, biodegradability or selective permeability. Moreover, a few had certain mechanical strength, anti-inflammatory, or carrier capacities. However, there still existed some defects, such as time, technology, clinical trials, material targeting and different measurement standards which also lowered the reliability of their results.In future, anti-adhesion biomaterials should focus on affordable raw materials with wide sources, and the production process should be simplified, in this way, the versatility and targeting of materials will be improved.
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Structure and magnetic properties of CrN thin films on La0.67Sr0.33MnO3
Zhongpo Zhou,Dingbo Zhang,Haiying Wang,Tianxing Wang,Zhansheng Lu,Zongxian Yang,Zhiwei Ai,Hao Wu,Chang Liu 한국물리학회 2018 Current Applied Physics Vol.18 No.11
High crystalline quality CrN thin films have been grown on La0.67Sr0.33MnO3 (LSMO) templates by molecular beam epitaxy. The structure and magnetic properties of CrN/LSMO heterojunctions are investigated combining with the experiments and the first-principles simulation. The Nėel temperature of the CrN/LSMO samples is found to be 281 K and the saturation magnetization of CrN/LSMO increases compared to that of LSMO templates. The magnetic property of CrN/LSMO heterostructures mainly comes from Cr atoms of (001) CrN and Mn atoms of (001) LSMO. The (001) LSMO induces and couples the spin of the CrN sublattice at CrN/LSMO interface.
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Chengping Wang,Jimin Zhang,Hechao Zhou,Haiying Lu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
A virtual track train runs at fixed stations on designated lines. The short distance between stations requires frequent traction, uniform and braking, which will have a serious impact on vehicle performance and road life. A three-dimensional dynamics model of the virtual track train comprising three vehicles was established based on the theory of vehicle dynamics, tire dynamics, and nonlinear dynamics. The dynamics model comprised vehicle model and tireroad model, considering the dynamic coupling between vehicles and tire-road dynamic interaction. The field dynamic acceleration test of the actual virtual track train was used to validate the developed dynamics model. The running quality and road friendliness of the virtual track train in multiple running stages between stations were evaluated by theoretical analysis and numerical calculation. The results indicated that the running quality in the traction stage and braking stage is smaller than that in the uniform stage. The road friendliness in the uniform stage is better than that in the traction and braking stage. The increase in running speed and the decrease in road grade both reduce the running quality and road friendliness. The increase in acceleration or deceleration makes the road friendliness worse, and it has less impact on the running quality. The research results provide recommendations for the running mode of the virtual track train to improve the running quality. At the same time, they can provide guidance for asphalt pavement laying to slow down the road damage.
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