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- 저자 : Chaoyang Ren (검색결과 5 건)
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Chaoyang Zhou,Da Ren,Xiaonian Cheng 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.1
To upgrade shear performance of reinforced concrete (RC) beams, and particularly of the segments under negative moment within continuous T-section beams, a series of original schemes has been proposed using carbon fibre-reinforced polymer (CFRP) U-shaped strips for shear-strengthening. The current work focuses on one of them, in which CFRP U-strips are wound around steel bars against the top of the flange of a T-beam and then spliced on its bottom face in addition to being bonded onto its sides. The test results showed that the proposed scheme successfully provided reliable anchorage for U-strips and prevented premature onset of shear failure due to FRP debonding. The governing shear mode of failure changed from peeling of CFRP to its fracture or crushing of concrete. The strengthened specimens displayed an average increase of about 60% in shear capacity over the unstrengthened control one. The specimen with a relatively high ratio and uniform distribution of CFRP reinforcement had a maximum increase of nearly 75% in strength as well as significantly improved ductility. The formulas by various codes or guidelines exhibited different accuracy in estimating FRP contribution to shear resistance of the segments that are subjected to negative moment and strengthened with well-anchored FRP U-strips within continuous T-beams. Further investigation is necessary to find a suitable approach to predicting load-carrying capacity of continuous beams shear strengthened in this way.
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李超阳(Chaoyang Li),牛凯宁(Kaining Niu),任玉璐(Yulu Ren),梁洁(Jie Liang),曹露浩(Luhao Cao) YIXIN 출판사 2024 Journal of China Studies Vol.2 No.3
随着全球人口老龄化速度日益加快,解决养老问题成为一大难题,基于大数据及互联网技术的智慧社区养老服务应运而生。为进一步探析老年人对于智慧社区养老服务参与意愿的影响因素,首先通过从智慧社区养老和参与意愿两个方面梳理相关文献研究,为本文提供理论依据;其次,为实现研究的典型性,以潍坊市作为研究试验点,通过发放问卷的方式收集关于老年人智慧社区养老服务参与意愿的调研并采用单因素分析进行因素筛查,将筛查后的结果通过二元logistic 回归方法进行分析;再次,得出结果主要从三个方面分析,个体因素中年龄、户口类型、职业;家庭内部因素中居住状况、家人是否支持您参加社区养老以及外部因素中邻里关系、暴露隐私是老年人对智慧社区养老的参与意愿的影响因素;最后,通过讨论发现现存问题所在并提出通过提供以需求为导向的智慧社区养老服务、更新养老观念、营造良好外部环境等举措来提高老年人智慧社区养老参与意愿。 With the accelerating global aging population, solving eldercare issues has become a significant challenge, and smart community elderly care services based on big data and internet technology have emerged as a response. To further analyze the factors influencing the elderly’s willingness to participate in smart community elderly care services, this study first reviews relevant literature from the perspectives of smart community elderly care and willingness to participate, providing a theoretical basis for this paper. Next, to ensure the typicality of the research, Weifang City is selected as the study’s experimental site. Questionnaires were distributed to collect data on the elderly’s willingness to participate in smart community elderly care services, and univariate analysis was conducted for factor screening. The screened results were then analyzed using binary logistic regression. The results are mainly analyzed from three aspects: individual factors such as age, type of household registration, and occupation; family internal factors such as living situation, family support for participating in community elderly care, and external factors such as neighborhood relationships and exposure to privacy. These factors influence the elderly’s willingness to participate in smart community elderly care. Finally, through discussion, the study identifies existing problems and proposes measures to improve the elderly’s willingness to participate in smart community elderly care, such as providing demand-oriented services, updating elderly care concepts, and creating a favorable external environment.
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Research on optimization of milling performance of V-groove micro-texture ball-end milling cutter
Shucai Yang,Chaoyang Guo,Wei Ren 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
Titanium alloys generally have problems such as sticking, large cutting force, and poor heat dissipation during the cutting process., research shows that processing microtextures on the surface of the tool can effectively improve the above problems. Therefore, this paper designs the V-groove micro-textures based on the principle of bionics. Use simulation software to analyze the milling behavior of different V-groove micro-texture ball-end milling cutters for milling titanium alloys. Build a test platform to study the milling performance of the Vgroove micro-texture ball-end milling cutter for milling titanium alloys, obtain the prior choice range of V-groove micro-texture parameters, optimize the parameters based on the simulated annealing algorithm and conduct experimental verification. The results of the optimal tool parameters are that the opening angle of the V-groove micro-textures is 79°, the V-groove microtexture spacing is 170 μm, and the V-groove micro-texture width is 30 μm, the distance from blade of the V-groove micro-textures is 90 μm.
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Cheng, Jing,Ren, Chaoyang,Cheng, Renli,Li, Yunning,Liu, Ping,Wang, Wei,Liu, Li The Korean Society of Pharmacology 2021 The Korean Journal of Physiology & Pharmacology Vol.25 No.2
Aging is the process spontaneously occurred in living organisms. Cardiac fibrosis is a pathophysiological process of cardiac aging. Mangiferin is a well-known C-glucoside xanthone in mango leaves with lots of beneficial properties. In this study, rat model of cardiac fibrosis was induced by injected with 150 mg/kg/d D-galactose for 8 weeks. The age-related cardiac decline was estimated by detecting the relative weight of heart, the serum levels of cardiac injury indicators and the expression of hypertrophic biomakers. Cardiac oxidative stress and local inflammation were measured by detecting the levels of malondialdehyde, enzymatic antioxidant status and proinflammatory cytokines. Cardiac fibrosis was evaluated by observing collagen deposition via masson and sirius red staining, as well as by examining the expression of extracellular matrix proteins via Western blot analysis. The cardiac activity of profibrotic TGF-β1/p38/MK2 signaling pathway was assessed by measuring the expression of TGF-β1 and the phosphorylation levels of p38 and MK2. It was observed that mangiferin ameliorated D-galactose-induced cardiac aging, attenuated cardiac oxidative stress, inflammation and fibrosis, as well as inhibited the activation of TGF-β1/p38/MK2 signaling pathway. These results showed that mangiferin could ameliorate cardiac fibrosis in D-galactose-induced aging rats possibly via inhibiting TGF-β/p38/MK2 signaling pathway.
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