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680 results on '"Liu, Yu‐Qing"'

201. The Key Technology Research Based on Desktop 3D Printer of Parallel Mechanism.

Author

LIU Yu-qing, ZHANG Chunyan, ZHANGQiu-jie, XU Yao, YANG Liu-song, and HUANG Xiao-fei

Subjects
TECHNOLOGY research, THREE-dimensional display systems, COMPUTER printers, PRECISION (Information retrieval), RAPID prototyping
Abstract

The paper aims at desktop 3D printer of parallel mechanism. It describes the performance requirements of the 3D printer mechanism. It compares the common performance institutions, obtaining the more suitable mechanism for 3D printer. It uses Solidworks to complete the overall printer model design. Then analysis and compare the key technology 3D printer, motor selection, positioning way and extrusion device obtaining for the suitable design scheme. Complete 3D printer machine design and prototyping; finally use the prototype to print out high-precision products. [ABSTRACT FROM AUTHOR]

Published
2016

208. Sesquiterpenoids and Lignans from the Roots of Valeriana officinalis L.

Author

Wang, Peng-Cheng, primary, Ran, Xin-Hui, additional, Chen, Rui, additional, Luo, Huai-Rong, additional, Ma, Qing-Yun, additional, Liu, Yu-Qing, additional, Hu, Jiang-Miao, additional, Huang, Sheng-Zhuo, additional, Jiang, He-Zhong, additional, Chen, Zhong-Quan, additional, Zhou, Jun, additional, and Zhao, You-Xing, additional

Published
2011
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228. Numerical study on the impact of wall thermal inertia on maximum smoke temperature and longitudinal attenuation in long channel fires.

Author

Wang, Kai-hong, Liu, Yu-qing, Zhang, Pei-hong, and Guo, Yin-liang

Subjects
*SMOKE, *WALLS, *HEAT release rates, *TEMPERATURE distribution, *EXPONENTIAL sums, *TEMPERATURE, *THERMAL properties
Abstract

In order to better understand the law of smoke propagation in long channel fires and enhance the fire protection of channel structure with different lining materials, a series of fire simulations were carried out by Fire Dynamics Simulator (FDS) to investigate the impact of wall thermal inertia on the maximum smoke temperature and longitudinal attenuation under the channel ceiling. Five wall materials corresponding from the foam concrete to the steel with thermal inertia ranging from 0.1 to 165 kW2•s/(m4·K2) and four heat release rates (5 MW, 7.5 MW, 10 MW and 12.5 MW) were employed. The maximum smoke temperature above the fire source and the temperature distribution under the ceiling along the channel longitudinal centerline were attained and analyzed. The results show that the maximum smoke temperature is significantly affected by the channel wall thermal property and increases with the decrease of wall thermal inertia. Based on the simulative data, a modified model taking the influence of wall thermal inertia into consideration is put forward to predict the maximum gas temperature below the ceiling. Further, the effect of channel wall thermal inertia on the longitudinal smoke temperature decay can be negligible when the thermal inertia is greater than or equal to 1.21 kW2•s/(m4·K2), however, the foam concrete wall with the thermal inertia of 0.1 kW2•s/(m4·K2) results in a smaller attenuation rate due to less heat conducted into the channel wall. Meanwhile, the smoke temperature distribution along the channel longitudinal centerline is also related to the heat release rate (HRR), and the larger the HRR, the slower the temperature decay. The investigation indicates that the temperature distribution along the longitudinal direction follows an exponential attenuation in the near fire field but presents a form of the sum of two exponential functions in the one-dimensional smoke propagation stage. Then taking the effect of wall thermal inertia and heat release rate into account, two novel models characterizing the law of longitudinal temperature attenuation were developed near fire source and in the one-dimensional smoke spread stage respectively. • Maximum smoke temperature and longitudinal temperature attenuation were investigated in a long channel. • Smoke propagation beneath the ceiling with different thermal inertia were considered. • Modified model on maximum smoke temperature with different wall thermal inertia. • Proposed correlations on smoke temperature attenuation with different wall thermal inertia. [ABSTRACT FROM AUTHOR]

Published
2023
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236. Ethanolic Ginkgo biloba leaf extract prevents renal fibrosis through Akt/mTOR signaling in diabetic nephropathy.

Author

Lu, Qian, Zuo, Wen-Zi, Ji, Xiao-Jun, Zhou, Yue-Xian, Liu, Yu-Qing, Yao, Xiao-Qin, Zhou, Xue-Yan, Liu, Yao-Wu, Zhang, Fan, and Yin, Xiao-Xing

Abstract

Background: Recently, extract of Ginkgo biloba leaves (GbE) have become widely known phytomedicines and have shown various pharmacological activities, including improvement of blood circulation, protection of oxidative cell damage, prevention of Alzheimer's disease, treatment of cardiovascular disease and diabetes complications. This study was designed to investigate the effects of an ethanolic GbE on renal fibrosis in diabetic nephropathy (DN) and to clarify the possible mechanism by which GbE prevents renal fibrosis.Study Design: We investigated the protective effects of GbE on renal fibrosis in STZ-induced diabetic rats. Rats were randomized into six groups termed normal control, diabetes mellitus, low dose of GbE (50 mg/kg/d), intermediate dose of GbE (100 mg/kg/d), high dose of GbE (200 mg/kg/d) and rapamycin (1 mg/kg/d).Methods: After 12 weeks, the rats were sacrificed and then fasting blood glucose (FBG), creatinine (Cr), blood urea nitrogen (BUN), urine protein, relative kidney weight, glycogen and collagen accumulation, and collagen IV and laminin expression were measured by different methods. The amounts of E-cadherin, α-SMA and snail, as well as the phosphorylation of Akt, mTOR and p70S6K in the renal cortex of rats, were examined by western blotting.Results: Compared with diabetic rats, the levels of Cr, BUN, urine protein, relative kidney weight, accumulation of glycogen and collagen, and expression of collagen IV and laminin in the renal cortex were all decreased in GbE treated rats. In addition, GbE reduced the expression of E-cadherin, α-SMA, snail and the phosphorylation of Akt, mTOR and p70S6K in diabetic renal cortex.Conclusion: GbE can prevent renal fibrosis in rats with diabetic nephropathy, which is most likely to be associated with its abilities to inhibit the Akt/mTOR signaling pathway. [ABSTRACT FROM AUTHOR]

Published
2015
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238. Epigallocathechin-3 gallate inhibits cardiac hypertrophy through blocking reactive oxidative species-dependent and -independent signal pathways

Author

Li, Hong-Liang, primary, Huang, Yue, additional, Zhang, Chan-Na, additional, Liu, Guang, additional, Wei, Yu-Sheng, additional, Wang, Ai-Bing, additional, Liu, Yu-Qing, additional, Hui, Rui-Tai, additional, Wei, Chiming, additional, Williams, G. Metville, additional, Liu, De-Pei, additional, and Liang, Chih-Chuan, additional

Published
2006
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240. In vitro genotoxicity of exhaust emissions of diesel and gasoline engine vehicles operated on a unified driving cycle

Author

Liu, Yu-Qing, primary, Keane, Michael, additional, Ensell, Mang, additional, Miller, William, additional, Kashon, Michael, additional, Ong, Tong-man, additional, Mauderly, Joe, additional, Lawson, Doug, additional, Gautam, Mridul, additional, Zielinska, Barbara, additional, Whitney, Kevin, additional, Eberhardt, James, additional, and Wallace, William, additional

Published
2005
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245. Control-oriented dynamic identification modeling of a planar SOFC stack based on genetic algorithm-least squares support vector regression.

Author

Huo, Hai-bo, Ji, Yi, Zhu, Xin-jian, Kuang, Xing-hong, and Liu, Yu-qing

Abstract

Copyright of Journal of Zhejiang University: Science A is the property of Springer Nature 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
2014
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247. An integrated supramolecular fungicide nanoplatform based on pH-sensitive metal–organic frameworks

Author

Wang, Chao-Yi, Liu, Yu-Qing, Jia, Chengguo, Zhang, Ming-Zhe, Song, Chun-Li, Xu, Changling, Hao, Ran, Qin, Jian-Chun, and Yang, Ying-Wei

Abstract

The construction of an integrated nanoplatform with controlled fungicide delivery features in the specific microenvironment produced by fungal pathogens is a highly desirable strategy to improve the utilization of fungicides. Herein, we report a supramolecular fungicide delivery system based on benzimidazole-modified NH2-MIL-101(Fe) metal–organic frameworks (B-MIL-101(Fe) MOFs) as carriers loaded with osthole (OS), and β-cyclodextrin (β-CD) as nanovalves to form β-CD@B-MIL-101(Fe)-OS. The nanoplatform can release the loaded OS for fungus control through self-degradation of the MOFs skeleton in an oxalic acid microenvironment produced by Botrytis cinerea. The experimental results exhibit that the constructed supramolecular fungicide delivery system could effectively inhibit mycelial growth and protect the tomatoes from infection by B. cinereaduring the ripening stage. This strategy constructs a facile and integrated supramolecular drug delivery system for B. cinereacontrol and opens up a new avenue for the sustainable development of modern agriculture.

Published
2023
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