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Jiwei Huang,Jie Zeng,Yufang Bai,Zhuming Cheng,Yong Wang,Qidi Zhao,Dakai Liang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.1
An analysis method for improving the shear strength for the single-lap joints of dissimilar materials based on the cohesive zone model (CZM) is presented in this paper. The shear-lag model is established for the single-lap joint, and the stress distribution of joints is derived on the basis of this model, which is verified by simulation. The bilinear CZM is constructed to simulate the fracture process of joints, and the influence of lap length and adhesive layer thickness on the stress distribution of adhesive layers is comprehensively analyzed through simulation. Therefore, the effects of different properties of adhesive layers on the bonded structure strength are discussed with experiments. Results show that the reasonable lap length and thickness in this work are, respectively, 20-22 and 0.4-0.6 mm. The research results will serve as a guide for the parameter design, fracture prediction, and performance optimization of bonded joints.
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( Jiwei Duan ),( Jun Liu ),( Xueling Ma ),( Yue Zhang ),( Xiaohua Wang ),( Kai Zhao ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.1
Termites are destructive to agriculture, forestry, and buildings, but they can also promote agro-ecosystem balance through the degradation of lignocellulose. Termite-triggered cellulose digestion may be clarified through microbial metabolism of cellulose products. In the present study, we characterized the activities of cellulase and its three components synthesized by the cellulase-producing fungal strain HDZK-BYTF620 isolated from the gut of Odontotermes formosanus. The protein components of cellulases were synthesized by strain HDZK-BYTF620, which were isolated and characterized using polyacrylamide gel electrophoresis, and the expression of the cellulases was studied at the proteome level.
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Mengqi Song,Qian Zhao,Xiuting Wang,Chuan Shi,Xiao Hu,Jiwei Li 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9
In this study, an asymmetric wettable composite wound dressing consists of hydrophobic polyvinylidene fluoride(PVDF) outer layer and a hydrophilic polydopamine (PDA) coated Ag nanoparticles (Ag NPs)/PVDF layer (PVDF-Ag-PDA) was successfully prepared through electrospinning and PDA coating. The results show that the contact angle of thePVDF surface is 132.8 °, while the PDA-coated surface is nearly 0 °, indicating an asymmetric wettability. The highlyhydrophilic PVDF-Ag-PDA layer can significantly reduce bacterial growth, while the PVDF layer with a small pore size andhigh hydrophobicity can prevent bacterial adherence. In addition, cytotoxic assays showed that PVDF/PVDF-Ag-PDApresent a high cell viability percentage (above 80 %), which is attributed to that the thin layer of PDA can alleviate thecytotoxicity of Ag NPs. Therefore, the Janus wound dressing noted as PVDF/PVDF-Ag-PDA has the potential for practicalapplications with the advantages mentioned above.
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Distributed Finite-time Dynamic Event-triggered Consensus Control for Nonlinear Multi-agent Systems
Panfei Huang,Fuqiang Di,Jiwei Xu,Jinxiong Zhao 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.11
This paper is concerned with a second-order sliding mode finite-time consensus control problem for nonlinear multi-agent systems with dynamic event-triggered communication. A novel dynamic event-triggered control strategy with two sub-dynamic triggering conditions is proposed to address the limited communication, which are established based on internal variables and local information. Different from the traditional static event-triggered strategy, the proposed dynamic event-triggered strategy can further reduce the update frequency of the actuator. Different from the dynamic triggering conditions that can only be applied to asymptotically convergent systems, the dynamic triggering condition designed in this paper can apply to finite-time convergent systems. The stability of the closed-loop system can be guaranteed by the Lyapunov theorem. Simulation results are provided to verify the effectiveness of the developed dynamic event-triggered consensus control law.
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( John Reza Matthews ),( Jiefei Wang ),( Jiwei Zhao ),( Melissa A. Kluczynski ),( Leslie J. Bisson ) 대한슬관절학회 2020 대한슬관절학회지 Vol.32 No.-
Background: Repair of a meniscal tear is indicated in certain conditions. Despite extensive research on the biomechanics of various repair methods, there has been minimal investigation of whether the suture material influences the meniscal-suture construct. The purpose of this study was to compare the biomechanical properties of nine different suture materials under cyclic and load-to-failure conditions. Methods: Ninety porcine menisci were randomly allocated to simple suture placement using either Ultrabraid<sup>®</sup>, Ultratape<sup><sup>®</sup> </sup>, Magnum Wire<sup>®</sup>, TigerWire<sup>®</sup>, TigerTape<sup>®</sup>, LabralTape<sup>®</sup>, Orthocord<sup>®</sup>, 0 FiberWire<sup>®</sup>, or 2-0 FiberWire<sup>®</sup>. Each suture-meniscus specimen underwent cyclic loading followed by load-to-failure testing. Elongation, maximum load to failure, stiffness, and mode of failure were recorded and compared between each suture type using nonparametric testing. Mean ± standard deviation was reported and the statistical significance was p < 0.05. Results: Elongation during cyclic loading was lowest with 2-0 FiberWire (0.95 ± 0.17 mm); this value was statistically significantly different than the results for all other sutures except 0 FiberWire<sup>®</sup> (1.09 ± 0.17 mm, p = 0.79), TigerWire<sup>®</sup> (1.09 ± 0.29 mm, p = 0.85), TigerTape<sup>®</sup> (1.39 ± 0.29 mm, p = 0.08), and LabralTape<sup>®</sup> (1.20 ± 0.33 mm, p = 0.41). The highest elongation was seen with Ultrabraid<sup>®</sup> (1.91 ± 0.34 mm); this value was statistically significantly greater than the results for all other suture materials except Orthocord<sup>®</sup> (1.59mm± 0.31 mm, p = 0.46) and Magnum Wire<sup>®</sup> (1.43 ± 0.25 mm, p = 0.14). Load to failure was highest for TigerTape<sup>®</sup> (287.43 ± 41.15 N), and this result was statistically significantly different than the results for all other sutures except LabralTape<sup>®</sup> (271.34 ± 48.48 N, p = 0.99) and TigerWire<sup>®</sup> (251.03 ± 25.8 N, p = 0.51). Stiffness was highest for LabralTape<sup>®</sup> (195.77 ± 49.06 N/mm), and this result was statistically significantly different than the results for all other sutures except TigerWire<sup>®</sup> (186.49 ± 19.83 N/ mm, p = 0.45) and TigerTape<sup>®</sup> (173.35 ± 15.60 N/mm, p = 0.19). The majority of sutures failed by pullout (n = 46, 51%) or tearing (n = 40, 45%). Conclusion: Suture design and material affect the biomechanical behavior of porcine meniscal-suture specimens. LabralTape<sup>®</sup>, TigerWire<sup>®</sup>, and TigerTape<sup>®</sup> demonstrated better overall combinations of low elongation, high maximum load to failure, and high stiffness.
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