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- 저자 : Weijie Chang (검색결과 5 건)
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Chang Chen,Rui Zhou,Weijie Sun 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
The straight-through electric fully closed ultra-clean cut-off valve is a completely closed shut-off valve inside and outside. It relies on magnetic force as the driving force of the valve to control the opening and closing of the valve. In this paper, a new type of cut-off valve structure was designed, a mathematical model was established and its hydrodynamic characteristics were simulated by the computational fluid dynamics method. According to different inlet velocities and different valve openings, the internal cavitation phenomenon of the valve was analyzed. The external magnetic drive control device was designed in combination with the completely closed structure inside and outside the valve, and the magnetic field interference and force of the external permanent magnet and the embedded permanent magnet were studied. This study is helpful for the optimization design and practical engineering application of the ultra-clean valve.
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Xiao Liu,Weijie Chi,Antonio de J Gómez-Infante,Eduardo Peña-Cabrera,Xiaogang Liu,Young-Tae Chang 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.1
Different functions of molecular rotors based on viscosity sensitivity and temperature dependence.
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Vapour–liquid–solid growth of monolayer MoS<sub>2</sub> nanoribbons
Li, Shisheng,Lin, Yung-Chang,Zhao, Wen,Wu, Jing,Wang, Zhuo,Hu, Zehua,Shen, Youde,Tang, Dai-Ming,Wang, Junyong,Zhang, Qi,Zhu, Hai,Chu, Leiqiang,Zhao, Weijie,Liu, Chang,Sun, Zhipei,Taniguchi, Takaaki,Os Nature Publishing Group UK 2018 Nature Materials Vol.17 No.6
<P>Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS2, yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO3 and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS2 ribbons in the 'crawling mode' when saturated with sulfur. The locally well-defined orientations of the ribbons reveal the regular horizontal motion of the droplets during growth. Using atomic-resolution scanning transmission electron microscopy and second harmonic generation microscopy, we show that the ribbons are grown homoepitaxially on monolayer MoS2 with predominantly 2H-or 3R-type stacking. Our findings highlight the prospects for the controlled growth of atomically thin nano-structure arrays for nanoelectronic devices and the development of unique mixed-dimensional structures.</P>
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Jun Ding,Dan Yang,Yinan Wang,Weijie Zhang,Tingting Chen,Yaqing Chang 한국유전학회 2017 Genes & Genomics Vol.39 No.11
The Strongylocentrotus intermedius is an important commercially cultivated marine animal in China. In recent years, some individuals with diaphanous tube feet, rather than the normal red tube feet, have been observed among animals under cultivation; the basis of this phenotypic change is uncertain. In order to better understand the differences between two color tube feet of S. intermedius at the molecular level, we constructed four cDNA libraries from tube feet and coelomocytes of S. intermedius individuals with red or diaphanous tube feet. A total of 216,729,214 clean reads were assembled into 87,510 transcripts with an average size of 1677 bp. A BlastX search showed that 72,690 transcripts had significant matches in at least one target database. Expression profile analysis was performed on the four libraries and many differentially expressed genes were identified. Using gene enrichment analysis, several biological processes related to immune responses as well as immune-related candidate genes were identified. A total of 1694 genes were immune-related, and the genes expression of red tube feet were higher than that of diaphanous tube feet. In addition, 50,427 simple sequence repeats were obtained from the S. intermedius transcriptomes, while 32,650 and 42,264 single nucleotide polymorphisms were found in S. intermedius with diaphanous tube feet and red tube feet, respectively. These results provide valuable information for the future studies involving marker-assisted breeding and the studies of population genetics and genomics on S. intermedius.
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Yuan Ren,Ziyuan Fan,Qiao Huang,Qiaowei Ye,Weijie Chang,Yichao Wang 국제구조공학회 2023 Smart Structures and Systems, An International Jou Vol.31 No.2
For long-span bridges with a structural health monitoring (SHM) system, environmental temperature-driven responses are proved to be a main component in measurements. However, anomalous structural behavior may be hidden incomplicated recorded data. In order to receive reliable assessment of structural performance, it is important to study therelationship between temperature and monitoring data. This paper presents an application of the cointegration based methodology to detect anomalies that may be masked by temperature effects and then forecast the temperature-induced deflection (TID) of long-span suspension bridges. Firstly, temperature effects on girder deflection are analyzed with fieldmeasured data of a suspension bridge. Subsequently, the cointegration testing procedure is conducted. A threshold-based anomaly detection framework that eliminates the influence of environmental temperature is also proposed. The cointegrated residual series is extracted as the index to monitor anomaly events in bridges. Then, wavelet separation method is used to obtain TIDs from recorded data. Combining cointegration theory with autoregressive moving average (ARMA) model, TIDs for longspan bridges are modeled and forecasted. Finally, in-situ measurements of Xihoumen Bridge are adopted as an example to demonstrate the effectiveness of the cointegration based approach. In conclusion, the proposed method is practical for actual structures which ensures the efficient management and maintenance based on monitoring data.
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