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- 저자 : Zhengqi Li (검색결과 6 건)
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Zhengqi Tang,Tao Wang,Zhengliang Li 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.3
In this paper, the effect of semi-rigid connections on the stability bearing capacity of cross-bracings in steel tubular transmission towers is investigated. Herein, a prediction method based on the hybrid model which is a combination of particle swarm optimization (PSO) and backpropagation neural network (BPNN) is proposed to accurately predict the stability bearing capacity of cross-bracings with semi-rigid connections and to efficiently conduct its probabilistic assessment. Firstly, the establishment of the finite element (FE) model of cross-bracings with semi-rigid connections is developed on the basis of the development of the mechanical model. Then, a dataset of 7425 samples generated by the FE model is used to train and test the PSO-BPNN model, and the accuracy of the proposed method is evaluated. Finally, the probabilistic assessment for the stability bearing capacity of cross-bracings with semi-rigid connections is conducted based on the proposed method and the Monte Carlo simulation, in which the geometric and material properties including the outer diameter and thickness of cross-sections and the yield strength of steel are considered as random variables. The results indicate that the proposed method based on the PSOBPNN model has high accuracy in predicting the stability bearing capacity of cross-bracings with semi-rigid connections. Meanwhile, the semi-rigid connections could enhance the stability bearing capacity of cross-bracings and the reliability of crossbracings would significantly increase after considering semi-rigid connections.
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Study on flow fields of centrally fuel rich swirl burner and its applications
Zhichao Chen,Zhengqi Li,Jianping Jing,Lizhe Chen,Shaohua Wu,Yang Yao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Experiments on a single-phase test facility were done to optimize primary air outlet cones of a centrally fuel rich swirl coal combustion burner. On the basis of optimized results from the single-phase test, a three-component particle-dynamics anemometer was used to measure, in the near-burner region, the characteristics of gas/particle two-phase flows for the burner with two primary air outlet cones, on a gas/particle two-phase test facility. Velocities, RMS velocities and particle volume flux profiles were obtained. According to the results, the primary air outlet cone structure of the centrally fuel rich burner was matching a 670 ton per hour boiler. The performance of the burner on a 670 ton per hour boiler was studied.
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Query Algebra for the Very Loosely Structured Data Model
Ying Pan,Changan Yuan,Zhengqi Li,Wenjing Li 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.1
In order to realize the idea of pay-as-you-go (PAYG) data management which dataspace emphasizes, the very loosely structured data model is usually used to describe the massive, heterogeneous and dynamic data in dataspace. However, the present study mainly concentrates on the applications of the data model, and the query theory research is less. The query algebra is a theoretical foundation for query and its optimization in a PAYG fashion, so that how to establish a complete algebra based on the characteristics of loosely structured data model is an important problem need to be solved. In this paper, a formal definition of very loosely structured data model is given, then the query model and query algebra based on the model are proposed, which support to not only the operations such as set operators, selection, projection and join, but also association query in dataspace.
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이신청,위정기,엄붕,김원석,노혜신,김성민,Xinqing, Li,Zhengqi, Wei,Peng, Yan,Kim, Won-Suk,Ro, Hae-Sin,Kim, Sung-Min 한국디지털정책학회 2020 디지털융복합연구 Vol.18 No.9
본 연구는 중국전통 전지공예와 현대도예의 융합을 시론적으로 다룬 것이다. 전지공예는 중국인이 오랫동안 일상에서 즐겨온 팝아트적 예술이며, 현대도자는 이로부터 창작의 소재와 모티브를 공급받아 작가의 창의성을 자극하며 도예의 새로운 길을 열고 있다. 순수한 평면예술인 전지공예는 도자기를 만나 3차원 공간으로 전이되어 새로운 예술언어로 번역되었으며 도자재료는 그 가소성과 수용성으로 말미암아 전지공예 내포하고 있는 음양허실의 조화는 물론 전지작품에 대한 새로운 해석까지 가능하게 하였다. 본 연구는 이와 같은 양자의 융합에 대한 경향성과 가능성을 보여주고 있다. This study is an introductory study on Convergence of Traditional Chinese Paper-cutting Art and Contemporary Ceramic Decoration. As a part of Chinese folk art, now newly developed by the convergence of contemporary ceramic ar, today it promotes artists' creativity and find a alternative way for ceramic art. This mainly explore transition of 2 dimentional paper-cutting art into ceramic art. As a part of convergence art, this study suggest combination of 4 elements yin-yang-true-false with understanding of its history and contemporary status, and towards aesthetic values.
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Effects of solvent extraction on the microstructure of bituminous coal-based graphite
Wang Lipeng,Yao Zongxu,Guo Zhimin,Shen Xiaofeng,Li Zhiang,Zhou Zhengqi,Wang Yuling,Yang Jian-Guo 한국탄소학회 2022 Carbon Letters Vol.32 No.3
Coal-based graphite has become the main material of emerging industries. The microstructure of coal-based graphite plays an important role in its applications in many fields. In this paper, the effect of carbon disulfide/N-methyl-2-pyrrolidone solvent mixture extraction on the microstructure of bituminous coal-based graphite was systematically studied through preliminary extraction coupled with high-temperature graphitization. The graphitization degree g (75.65%) of the coal residue-based graphite was significantly higher than that of the raw coal-based graphite. The crystallite size La of the coal residue-based graphite was reduced by 47.06% compared with the raw coal-based graphite. The ID/ IG value of the coal residue-based graphite is smaller than that of the raw coal-based graphite. The specific surface area (16.72 m2/g) and total pore volume (0.0567 m3/g) of the coal residue-based graphite are increased in varying degrees compared with the raw coal-based graphite. This study found a carbon source that can be used to prepare coal-based graphite with high graphitization degree. The results are expected to provide a theoretical basis for further clean and efficient utilization of the coal residue resources.
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