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28 results on '"Wei, Xinguang"'

14. Gene Expression Trajectories from Normal Nonsmokers to COPD Smokers and Disease Progression Discriminant Modeling in Response to Cigarette Smoking

Author

Zhang, Zili, primary, Chen, Sifan, additional, Li, Qiongqiong, additional, Li, Defu, additional, Li, Yuanyuan, additional, Xie, Xiaohui, additional, Yuan, Liang, additional, Lin, Zeqiang, additional, Lin, Fanjie, additional, Wei, Xinguang, additional, Fang, Yaowei, additional, Wang, Jian, additional, and Lu, Wenju, additional

Published
2022
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21. Comparison of clinical characteristics and risk factors in hospitalized patients with SARS-CoV-2, MERS-CoV, and SARS-CoV infection

Author

Li, Zhengtu, primary, Wang, Xidong, additional, Su, Guansheng, additional, Zheng, Zeguang, additional, Li, Shaoqiang, additional, Ye, Yuwei, additional, Deng, Qiuxue, additional, Li, Jinchuang, additional, Xiong, Xiaoyu, additional, Wei, Xinguang, additional, Lin, Zeqiang, additional, Jie, Zichen, additional, and Ye, Feng, additional

Published
2020
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23. Greenhouse grapevine transpiration and water use efficiency under different water and nitrogen conditions*.

Author

Zheng, Siyu, Wang, Tieliang, Wei, Xinguang, Li, Bo, and Bai, Yikui

Subjects
WATER efficiency, NITROGEN in water, GREENHOUSES, PRODUCTION management (Manufacturing), AGRICULTURAL productivity, GRAPES, PLANT transpiration
Abstract

Copyright of Irrigation & Drainage is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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26. Identification of sap flow driving factors of jujube plantation in semi-arid areas in Northwest China.

Author

Wei Xinguang, Li Bo, Guo Chengjiu, Wang Youke, He Jianqiang, Shouyang Liu, Wang Tieliang, and Yao Mingze

Subjects
*JUJUBE (Plant), *PLANTATIONS, *ARID regions, *TILLAGE
Abstract

Jujube is widely cultivated in the semi-arid region of the Loess Plateau in Northwest China due to its high water deficit tolerance. In such an ecologically vulnerable area, it is critical to explore the water consumption processes of key tree species and their responses to driving factors. Sap flow data gathered during a two-year field study in a jujube plantation were analyzed as a surrogate for transpiration measurements. The measured sap flows were related to changes in the soil water content, meteorological factors (the vapor pressure deficit and the level of photosynthetically active radiation), and plant physiological factors (the sap wood area, leaf area and leaf area index). The factors that govern sap flow were found to vary depending on the growing season, and on hourly and daily timescales. The plants' drought tolerance could be predicted based on their peak sap flows and the variation in their sap flow rates at different soil water levels. The sap flow was most strongly affected by the water content of the topmost (0-20 cm) soil layer. Of the studied meteorological factors, the photosynthetically active radiation had a greater effect on sap flow than the vapor pressure deficit. The correlation we found could be applied to predict jujube tree water consumption and assist the design of irrigation scheme. [ABSTRACT FROM AUTHOR]

Published
2017
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28. Effect of various pretreatments on rhenium oxide-alumina catalysts: the structure and activity of active sites for propene metathesis

Author

Wei Xinguang, Guo Xiexian, Shi Yingzhen, Xu Yide, and Zhang Yihua

Subjects
Propene, chemistry.chemical_compound, Monomer, Adsorption, X-ray photoelectron spectroscopy, Chemistry, Rhenium oxide, Inorganic chemistry, General Engineering, Metathesis, Catalysis, Ion
Abstract

A series of Re 2 O 7 -Al 2 O 3 catalysts containing 3.0 – 15.3 wt.% Re 2 O 7 has been studied in a microcatalytic pulse reactor for propene metathesis. The effect of various pretreatments has been examined by catalyst evaluation as well as by the change in surface properties observed in TPR, O 2 -adsorption, ESR and XPS measurements. After N 2 pretreatment a linear relationship is obtained between the intensities of the ESR signal, assigned to partially reduced Re-O-Re dimeric species, and the activities of Re 2 O 7 -Al 2 O 3 catalysts. The concentration of the dimeric species strongly depends on the Re 2 O 7 loading. H 2 reduction at 450 °C followed by O 2 uptake at reaction temperature (80 °C) is effective in enhancing the activity of low loading catalysts, and the amount of reversibly adsorbed O 2 is shown to be closely connected with the catalytic activity. In this case, it is easy to detect the formation of O 2 − ions on the surface by ESR observation. Surface species of is very plausibly responsible for the enhanced activity of the low loading catalyst. By pretreatment with propene at 450 °C, the activity of the low loading catalyst is greatly increased. A significant partial reduction of Re 2 O 7 and simultaneous carbonaceous deposit on the catalyst surface are observed by ESR and XPS examination. It seems probable that monomeric species of Re +6 (or Re +5 -O-Al +3 are highly active and that the formation of such species on the surface is facilitated by treating the low loading catalyst with propene at 400 – 450 °C. It is apparent that the presence of appropriate unsaturated coordinated species of high-valence Re ions on dehydrated alumina is essential for active metathesis catalysts.

Published
1986

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