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RISS 인기검색어
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- 저자 : Yourong Wang (검색결과 5 건)
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Improving electrochemical performance of LiMnPO_4 by Zn doping using a facile solid state method
Yourong Wang,Yafang Chen,Siqing Cheng,Liangnian He 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
Olivine structure LiMnPO_4/C as cathode materials for Li-ion batteries were synthesized via a simple solidstate reaction. Improvement of the electrochemical performance of LiMnPO_4/C cathode material was realized significantly by the method of doping Zn. The obtained LiMn_(0.95)Zn_(0.05)PO_4/C electrode material was studied by the measurements of X-ray diffraction pattern, scanning electronic microscopy, electrochemical impedance spectroscopy and electrochemical performance. The results indicate that the LiMn_(0.95)Zn_(0.05)PO_4/C materials exhibit discharge specific capacity of 140.2 mA h g^(−1) at 0.02 C rate and better rate capability. These excellent results are elucidated by EIS test, which showed that there was the decrease of charge transfer resistance and faster lithium-ion diffusion in LiMnPO_4/C cathode materials after Zn doping.
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Social stratification and housing wealth inequality in transitional urban China
Chengdong Yi,Yuyao Li,Yourong Wang,Haiyuan Wan 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.1
As the Chinese economy continues to transform, housing wealth has gradually become the single largest asset in most urban households. At the same time, housing wealth inequality has worsened, and housing stratification has become a major form of social stratification in the country. However, there is no empirical evidence of temporal changes in housing wealth inequality and their implications on social stratification. Pooling three waves of survey data from the 1995, 2008, and 2013 iterations of the Chinese Household Income Project, we present a dynamic image of housing wealth inequality in urban China. The results suggest that housing wealth inequality decreased initially and increased later. To further illustrate how housing wealth is stratified by social groups, we conducted regression analyses and structural tests, which revealed three main results: the education level of the household head has an increasingly positive impact on housing wealth inequality; a household head with superior occupational status generally has an advantage in terms of possession of housing wealth with no evidence that this advantage diminishes during the transitional period; and income has a significant, positive impact on housing wealth, and this effect exhibited an increasing trend over time. These results imply that the temporal changes in housing wealth inequality exacerbated the social stratification in transitional urban China.
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Molecular Cloning and Characterization of a Novel Stem-specific Gene from Camptotheca acuminata
Pi, Yan,Liao, Zhihua,Chai, Yourong,Zeng, Hainian,Wang, Peng,Gong, Yifu,Pang, Yongzhen,Sun, Xiaofen,Tang, Kexuan Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.1
In higher plants, P450s participate in the biosynthesis of many important secondary metabolites. Here we reported for the first time the isolation of a new cytochrome P450 cDNA that expressed in a stem-specific manner from Camptotheca acuminata (designated as CaSS), a native medicinal plant species in China, using RACE-PCR. The full-length cDNA of CaSS was 1735 bp long containing a 1530 bp open reading frame (ORF) encoding a polypeptide of 509 amino acids. Bioinformatic analysis revealed that CASS contained a heme-binding domain PFGXGRRXCX and showed homology to other plant cytochrome P450 monooxygenases and hydroxylases. Southern blotting analysis revealed that there was only one copy of the CaSS present in the genome of Camptotheca acuminata. Northern blotting analysis revealed that CaSS expressed, in a tissue-specific manner, highly in stem and lowly in root, leaf and flower. Our study suggests that CaSS is likely to be involved in the phenylpropanoid pathway.
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Jiabiao Ruan,Zhimin Zhang,Tao Wang,Yourong Li,Gangbing Song 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.2
Bolted joint connection is the most commonly used connection element in structures and devices. The loosening due to external dynamic loads cannot be observed and measured easily and may cause catastrophic loss especially in an extreme requirement and/or environment. In this paper, an innovative Real-time Cross-Correlation Method (RCCM) for monitoring of the bolted joint loosening was proposed. We apply time reversal process on stress wave propagation to obtain correlation signal. The correlation signal’s peak amplitude represents the cross-correlation between the loosening state and the baseline working state; therefore, it can detect the state of loosening. Since the bolt states are uncorrelated with noise, the peak amplitude will not be affected by noise and disturbance while it increases SNR level and increases the measured signals’ reliability. The correlation process is carried out online through physical wave propagation without any other post offline complicated analyses and calculations. We implemented the proposed RCCM on a single bolt/nut joint experimental device to quantitatively detect the loosening states successfully. After that we implemented the proposed method on a real large structure (reaction wall) with multiple bolted joint connections. Loosening indexes were built for both experiments to indicate the loosening states. Finally, we demonstrated the proposed method’s great anti-noise and/or disturbance ability. In the instrumentation, we simply mounted Lead Zirconium Titanate (PZT) patches on the device/structure surface without any modifications of the bolted connection. The low-cost PZTs used as actuators and sensors for active sensing are easily extended to a sensing network for large scale bolted joint network monitoring.
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