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31 results on '"Qi, Wenqiang"'

12. Study on calculation method of stability for embedded penstocks with stiffener ring under external pressure

Author

Wang Bifei, Li Yuewei, Qi Wenqiang, and Wang Qihang

Subjects
Environmental sciences, GE1-350
Abstract

A three-dimensional FEM(finite element model)is established, including penstocks with initial defect (ovality), backfill concrete, drainage cushion and surrounding rock. The nonlinear static calculation of the model is carried out. The stability of penstocks with backfill concrete, drainage cushion and surrounding rock under external pressure is studied. The sensibility of the embedded penstocks to initial defect, initial gap and elastic modulus of drainage cushion is analyzed. The results of finite element method, Jacobsen method and strength formula in SL281 are compared and analyzed. The results indicate that the FEM of penstocks, backfill concrete and surrounding rock with initial defects is easy to converge by nonlinear calculation; the ovality and gap have little influence on the critical external pressure of the embedded penstocks with stiffener ring, while the drainage cushion has a certain influence on the critical external pressure; the critical external pressure calculated by SL281 is low and safe; compared with Jacobsen method, the critical external pressure of the finite element method is increased by about 14%; for the embedded penstocks with drainage cushion, the finite element method can be used to calculate the influence of the drainage cushion on the critical external pressure, and the appropriate reduction factor can be obtained, and then the Jacobsen result can be modified by the reduction factor.

Published
2021
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16. Quanduzhong capsules for the treatment of grade 1 hypertension patients with low-to-moderate risk: A multicenter, randomized, double-blind, placebo-controlled clinical trial

Author

Xu, Xuan, primary, Tian, Wende, additional, Duan, Wenhui, additional, Pan, Chaoxin, additional, Huang, Mingjian, additional, Wang, Qinggao, additional, Yang, Qinghua, additional, Wen, Zhihao, additional, Tang, Yu, additional, Xiong, Yao, additional, Zhu, Zhiyun, additional, Liu, Yuanyuan, additional, Wei, Dan, additional, Qi, Wenqiang, additional, Ouyang, Xiaochao, additional, Ying, Shaozhen, additional, Wang, Xiaohua, additional, Zhou, Zhigang, additional, Li, Xiaofeng, additional, Cui, Yu, additional, Yang, Shuyin, additional, and Xu, Hao, additional

Published
2023
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21. Safety and efficacy of extracorporeal shock wave lithotripsy vs. flexible ureteroscopy in the treatment of urinary calculi: A systematic review and meta-analysis

Author

Lv, Guangda, primary, Qi, Wenqiang, additional, Gao, Han, additional, Zhou, Yongheng, additional, Zhong, Minglei, additional, Wang, Kai, additional, Liu, Yunxing, additional, Zhang, Qiang, additional, Zhou, Changkuo, additional, Li, Yan, additional, Zhang, Lingling, additional, and Zhang, Dongqing, additional

Published
2022
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22. Revealing the prognostic and clinicopathological significance of systemic immune-inflammation index in patients with different stage prostate cancer: A systematic review and meta-analysis

Author

Qi, Wenqiang, primary, Zhou, Yongheng, additional, Liu, Zhifeng, additional, Wang, Jian, additional, Lv, Guangda, additional, Zhong, Minglei, additional, Wang, Wenfu, additional, Li, Rongyang, additional, Chen, Shouzhen, additional, Shi, Benkang, additional, and Zhu, Yaofeng, additional

Published
2022
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28. Mucin-poor mucinous tubular and spindle cell carcinoma of the kidney: one case report and review of the literature.

Author

Zhong, Minglei, Zhang, Zhaocun, Qi, Wenqiang, Zhou, Yongheng, Lv, Guangda, and Jiang, Xianzhou

Subjects
MUCINOUS adenocarcinoma, RENAL cell carcinoma, SMALL cell carcinoma, LITERATURE reviews, CARCINOMA, KIDNEYS
Abstract

Mucinous tubule and spindle cell carcinoma (MTSCC) of the kidney is a rare renal pleomorphic tumor considered as low-grade malignant, with occurring mainly in female. Few mucin-poor MTSCC cases have been reported so far. A typical MTSCC is composed of closely arranged tubules with pale mucus matrix and spindle cell components. Mucin-poor MTSCC is difficult to distinguish from other renal cell carcinomas due to small amount of mucus. We reported a case of mucin-poor MTSCC in a 37-year-old male with detailed imaging, histology, immunohistochemical and next-generation sequencing information, looking forward to providing an insight into mucin-poor MTSCC. [ABSTRACT FROM AUTHOR]

Published
2022
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30. Enhancing Carbohydrate Productivity of <italic>Chlorella</italic> sp. AE10 in Semi-continuous Cultivation and Unraveling the Mechanism by Flow Cytometry.

Author

Yuan, Yizhong, Liu, Heng, Li, Xuyang, Qi, Wenqiang, Cheng, Dujia, Tang, Tao, Zhao, Quanyu, Wei, Wei, and Sun, Yuhan

Abstract

Accumulated carbohydrate in microalgae is promising feedstock for bioethanol fermentation. Selection of suitable cultivation conditions in semi-continuous cultivation is critical to achieve a high carbohydrate productivity. In the current study, the effects of macro-nutrient (nitrogen, phosphorus, and sulfur) limitations and light intensity were evaluated for the carbohydrate accumulations of Chlorella sp. AE10 under 10% CO2 conditions. It was shown that nitrogen limitation and high light intensity were effective for improving carbohydrate productivity. The average carbohydrate and biomass productivity in semi-continuous cultivation with 1/4 N medium and 1000 μmol photons m−2 s−1 was 0.673 and 0.93 g L−1 day−1, respectively. Sulfur and phosphorus limitations could improve the carbohydrate content but they could not enhance the carbohydrate productivity. The cell cycle progression and chlorophyll a were investigated using flow cytometry (FCM). The results showed that macro-nutrient limitation and high light intensity indeed influenced cell cycle progression and led to the formation of polyploid cells along with the carbohydrate accumulation in a certain range. FCM was rapid and accurate method to investigate the operation conditions why 1/4 N, 2 days as a cycle, and high light intensity were optimal ones. In addition, the remaining high level of photosynthesis activity was also important for achieving a high carbohydrate productivity. Dynamic tracking of carbohydrate accumulation is helpful for establishment of a semi-continuous cultivation for enhancing carbohydrate productivity in microalgae. [ABSTRACT FROM AUTHOR]

Published
2018
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