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Search Results: 1 - 10 of 77477 matches for " WU Wen-guang "
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Micropore Structure Representation of Sandstone in Petroleum Reservoirs Using an Atomic Force Microscope

BAI Yong-Qiang,ZHU Xing,WU Jun-Zheng,BAI Wen-Guang,

中国物理快报 , 2011,
Duct-to-duct biliary reconstruction after radical resection of Bismuth IIIa hilar cholangiocarcinoma
Wen-Guang Wu,Jun Gu,Ping Dong,Jian-Hua Lu
World Journal of Gastroenterology , 2013, DOI: 10.3748/wjg.v19.i15.2441
Abstract: At present, radical resection remains the only effective treatment for patients with hilar cholangiocarcinoma. The surgical approach for R0 resection of hilar cholangiocarcinoma is complex and diverse, but for the biliary reconstruction after resection, almost all surgeons use Roux-en-Y hepaticojejunostomy. A viable alternative to Roux-en-Y reconstruction after radical resection of hilar cholangiocarcinoma has not yet been proposed. We report a case of performing duct-to-duct biliary reconstruction after radical resection of Bismuth IIIa hilar cholangiocarcinoma. End-to-end anastomosis between the left hepatic duct and the distal common bile duct was used for the biliary reconstruction, and a single-layer continuous suture was performed along the bile duct using 5-0 prolene. The patient was discharged favorably without biliary fistula 2 wk later. Evidence for tumor recurrence was not found after an 18 mo follow-up. Performing bile duct end-to-end anastomosis in hilar cholangiocarcinoma can simplify the complex digestive tract reconstruction process.
Effects of Flow Rate and Viscosity on Slip Factor of Centrifugal Pump Handling Viscous Oils
Wen-Guang Li
International Journal of Rotating Machinery , 2013, DOI: 10.1155/2013/317473
Abstract: Slip factor is an important parameter in the hydraulic design of centrifugal pump impeller for handling viscous oils. How to extract the factor from CFD computational results and how flow rate and liquid viscosity to affect it remain unclear. In the present paper, the flip factor was estimated by means of two approaches: one is from the velocity triangles at the impeller outlet and the other is due to the impeller theoretical head of 3D turbulent viscous fluid. The velocity of water and viscous oils in the impeller and volute computed by CFD was validated with LDV measurements at the best efficiency point. The effect of exit blade angle on slip factor was clarified. It was shown that the two approaches result into two different slip factors. The factors are significantly dependent of flow rate; however, the liquid viscosity seems to take less effect on them. Volute is responsible for reduction in tangential velocity of liquid at the outlet of impeller at low flow rates. The slip factor of impeller with large exit blade angle is not sensitive to flow rate. 1. Introduction The performance of centrifugal pump handling water and viscous oils was investigated numerically by using a CFD code FLUENT based on a steady, 3D, and incompressible turbulent flow. The turbulence effect was involved with the standard turbulence model and wall roughness was taken into account with the nonequilibrium wall function in [1]. The effect of liquid viscosity on pump performance was clarified through observing the pump head and hydraulic efficiency as well as hydraulic loss coefficient in terms of flow rate. A comparison of computed and experimental overall performance of the pump was made. It was confirmed that the “sudden-rising head effect” exists and is caused from the high viscosity and certain large surface roughness. The volute results in an increasing influence on the flow around the impeller exit at a low flow rate. Slip factor is one important design parameter for deciding a correct impeller diameter of centrifugal pump. The factor can be obtained theoretically and experimentally. The typical investigations include those conducted by Kasai [2, 3], Sakai and Watanabe [4], Noorbakhsh [5], Whitfield [6], Murata et al. [7], Harada and Senoo [8], Visser et al. [9], von Backstron [10], Hassenpflug [11], Ji et al. [12], Qiu et al. [13], and so on. The slip factor depends on impeller geometry [5, 7, 9, 10, 14], flow rate [2–4, 6, 13, 15], and viscosity of the liquid pumped [16, 17]. Recently, Slip factor is increasingly estimated by using CFD approach [18–22]. Thus it is
Hybrid optimization method based on differential evolution and immune clonal selection algorithm

YE Hong-tao,LUO Wen-guang,WU Yan,
,罗文广,吴 艳

计算机应用研究 , 2013,
Abstract: This paper proposed a hybrid optimization method to improve the immune clonal selection algorithm (ICSA) search ability. It based on the principles of differential evolution (DE) and immune clonal selection (ICA). It used the DE to improve the affinities of the clones of the antibodies in the ICSA. It analyzed the convergence of the hybrid optimization method. In order to test the effectiveness of the algorithm, it applied to solve the function optimization problems. Simulation results show that the improved algorithm was of high convergent speed and convergent accuracy.
Tribological Properties of PVA-H/HA Composites

WU gang,ZHANG Wen-guang,WANG Cheng-tao,

摩擦学学报 , 2007,
Abstract: PVA-H/HA composites were prepared by ultrasonic mix method and in situ synthesis method.The mechanical and tribological properties of specimen with different HA content were measured.Worn surfaces were investigated by using a scanning electron microscope to determine the wear mechanism of pure PVA-H and PVA-H/HA composites prepared by different methods.Experimental results show that filling HA to PVA-H slightly decreased the friction coefficient of composites with increasing of HA content under water lubrication condition.Wear resistance of PVA-H matrix was also greatly improved by the introduction of HA inorganic component.It also found that the PVA-H/HA prepared by in situ method exhibited better tribological properties than those prepared by mix method with the same components and under the same conditions.The composites exhibited the best wear resistance when the HA content was about 4% prepared by in situ synthesis.
Tribological Study of Porous Ultra-high Molecular Weight Polyethylene

WU Gang,ZHANG Wen-guang,WANG Cheng-tao,

摩擦学学报 , 2007,
Abstract: 模拟天然关节软骨中"多孔可渗透软垫层"的特征,采用模板-滤取工艺制备具有多孔结构的超高分子量聚乙烯(UHMWPE)仿生人工软骨材料,采用改进的四球摩擦磨损试验机研究多孔结构和UHMWPE分子量对试样摩擦磨损性能的影响,利用扫描电子显微镜观察多孔材料的表面形貌并分析其磨损机理.结果表明,多孔结构能够提高UHMWPE试样在牛血清润滑条件下的耐磨性.试样的孔隙率约为27%,UHMWPE分子量的改变对试样的失重和孔隙率影响不大,但能够略微降低多孔UHMWPE试样的磨损量.在干摩擦条件下,多孔试样的磨损量比普通试样高66.9%,在牛血清润滑下的磨损量比普通UHMWPE低46.6%.UHMWPE的多孔结构能够提高UHMWPE试样表面的润滑性能,降低其磨损量.
Tribological Property and Lubricant Mechanism of Biomimetic Artificial Cartilage Material

WU Gang,WANG Cheng-tao,ZHANG Wen-guang,

摩擦学学报 , 2009,
Abstract: PVA-H/HA composite and porous UHMWPE were prepared by in situ method and Template-Leaching,respectively.The friction and wear properties of two materials were comparatively studied under the same condition.The lubricating regimes of two materials sliding against stainless steel disc were investigated based on theoretical analysis of the relevant Stribeck curves.Both friction and wear loss of porous UHMWPE were higher than that of PVA-H/HA under dry sliding.While under lubrication,PVA-H/HA exhibited better s...
Experimental study on tar destruction in a two stage fixed-bed reactor

WU Wen-guang,LUO Yong-hao,CHEN Yi,SU Yi,CHEN Liang,WANG Yun,

燃料化学学报 , 2012,
Abstract: Methods of thermal cracking,partial oxidation and char bed conversion on tar destruction has been investigated by a two stage fixed-bed reactor,effects of fuel type,temperature,residence time,char particle size and char type on tar destruction are considered.The result indicates that tar conversion efficiency increase with the second stage reactor temperature increasing in all three kinds of conversion methods.Partial oxidation and char bed conversion is more effective in tar destruction compared to thermal cracking.Associated with partial oxidation and thermal cracking,char bed can get least tar yield.Three kinds of biomass tar yield in the experimental condition of 1 000 ℃ is: rice straw 0.43%,corn straw 0.61% and fir sawdust 1.15%,and the corresponding tar conversion efficiency is 98.28%,97.23% and 96.29% respectively.Tar yield content of each conversion methods are decreasing with reactor temperature increase.It is really difficult to removal all tar completely in these experiments due to complex tar composition and experimental conditions.The results also show that biomass tar destruction feasibility are: rice straw > corn straw>fir sawdust,and on obvious diversity is obtained between different char species on tar destruction.
Mir-184 Post-Transcriptionally Regulates SOX7 Expression and Promotes Cell Proliferation in Human Hepatocellular Carcinoma
Geng-Gang Wu, Wen-Hong Li, Wen-Guang He, Nan Jiang, Guang-Xian Zhang, Wei Chen, Hai-Feng Yang, Qi-Long Liu, Yan-Nian Huang, Lei Zhang, Tong Zhang, Xian-Cheng Zeng
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088796
Abstract: Hepatocellular carcinoma (HCC) is one of the most common human malignancies and the third leading cause of cancer mortality worldwide. The development and progression of HCC is a complicated process, involving the deregulation of multiple genes that are essential to cell biological processes. Recently, microRNAs (miRNAs) have been suggested to be closely associated with tumorigenesis. Our study showed that miR-184 is upregulated in HCC cell lines and tissues. Overexpression of miR-184 in HCC cells increased cell proliferation, tumorigenicity, and cell cycle progression, whereas inhibition of miR-184 reduced cell proliferation, tumorigenicity, and cell cycle progression. Additionally, we identified SOX7 as a direct target of miR-184. Ectopic expression of miR-184 led to downregulation of the SOX7 protein, resulting in upregulation of c-Myc, Cyclin D1, and phosphorylation of Rb. Our findings suggested that miR-184 represents a potential onco-miR and plays an important role in HCC progression by suppressing SOX7 expression.
Use of Real-time PCR Method in Determination of the Effects of Triticale Dried Distillers Grains with Solubles Inclusion in Beef Cattle Diets on the Populations of Rumen Prevotella Species
Real-time PCR法检测日粮中添加小黑麦干酒糟对肉牛瘤胃Prevotella属菌数量的影响

WU Rui-Bing,SU Rui,ZHANG Yan-Jun,WANG Rui-Jun,ZHANG Wen-Guang,LI Jin-Quan,

微生物学通报 , 2010,
Abstract: Using real-time PCR method to detect the effects of varying levels of triticale dried distillers grains with solubles (TDDGS) inclusion in beef cattle diets on the populations of three rumen Prevotella species viz., Prevotella ruminicola, Prevotella brevis and Prevotella bryantii. The results showed that 1) compared with control group (CG), the populations of P. ruminicola and P. brevis in all TDDGS groups (20%, 25% and 30% TDDGS) increased, and a 47-fold (P < 0.05) and a 794-fold (P < 0.05) significant increase were observed in 20% TDDGS group respectively, however, the population of P. bryantii decreased in all TDDGS groups and a 5-fold (P < 0.05) significant decrease was found in 20% TDDGS group; 2) compared among TDDGS groups, significant population difference was only observed between 20% and 30% TDDGS groups for P. ruminicola, however, no other significant population differences were found between the TDDGS groups for the three Prevotella species. The conclusion was that incorporation of 20% TDDGS in beef cattle diet significantly affected the populations of all three rumen Prevotella species but no obvious population changes were found between the TDDGS groups.
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