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Modulation of graft vascular inflow guided by flowmetry and manometry in liver transplantation

Hepatobiliary & Pancreatic Diseases International 2011年第6期10卷 649-656页

作者： See Ching Chan Chung Mau Lo Kenneth SH Chok William W Sharr Tan To Cheung Simon HY Tsang Albert CY Chan Sheung Tat Fan Department of Surgery The University of Hong Kong 102 Pokfulam RoadHong KongChina State Key Laboratory for Liver Research The University of Hong Kong 102 Pokfulam RoadHong KongChina

BACKGROUND:Survival of the partial graft after living donor liver transplantation owes much to its tremendous regenerative ability.With excellent venous outflow capacity,a graft within a wide range of graft-to-standard-liver-volume ratios can cope with portal hypertension that is common in liver transplant recipients.However,when the ratio range is exceeded,modulation of graft vascular inflow becomes necessary for graft survival.The interplay between graft-to-standard-liver-volume ratio and portal pressure,in the presence of portosystemic shunt or otherwise,requires individualized modulation of graft portal and arterial inflows.Boosting of portal inflow by shunt ligation can be guided by transonic flowmetry,whereas muting of portal inflow by splenic artery ligation can be monitored by portal electronic manometry.METHOD:We describe four cases to illustrate the above.RESULTS:One patient had hepatic artery thrombosis resulting from splenic artery steal syndrome which was the sequela of small-for-size syndrome.Emergency splenic artery ligation and re-anastomosis of the hepatic artery successfully muted the portal inflow and boosted the hepatic arterial inflow.Another patient with portal vein thrombosis underwent thrombendvenectomy.Portal inflow was boosted with ligation of portosystemic shunt,which is often present in these patients with portal hypertension.The coexistence of splenic aneurysm and splenorenal shunt required ligation of both in the third patient.The fourth patient,with portal pressure and flow monitoring,avoided ligation of a coronary vein which became a main portal inflow after portal thrombendvenectomy.CONCLUSION:Management of graft inflow modulation guided selectively by transonic flowmetry or portal manometry was described.

关键词： graft inflow liver transplantation modulation

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Hepatic blood inflow occlusion without hemihepatic artery control in treatment of hepatocellular carcinoma

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World Journal of Gastroenterology 2010年第46期16卷 5895-5900页

作者： Shan Jin,Department of General Surgery,Affiliated Hospital of Inner Mongolia Medical College,Hohhot 010050,Inner Mongolia Autonomous Region,China Chao-Liu Dai,Department of Hepatobiliary Surgery,Shengjing Hospital,China Medical University,Shenyang,Liaoning Province,China Department of General Surgery Affiliated Hospital of Inner Mongolia Medical College Hohhot 010050 Inner Mongolia Autonomous Region China. jinshangood@***

AIM:To investigate the clinical significance of hepatic blood inflow occlusion without hemihepatic artery control (BIOwHAC) in the treatment of hepatocellular carcinoma (HCC).METHODS:Fifty-nine patients with HCC were divided into 3 groups based on the technique used for achieving hepatic vascular occlusion:group 1,vascular occlusion was achieved by the Pringle maneuver (n=20);group 2,by hemihepatic vascular occlusion (HVO) (n=20);and group 3,by BIOwHAC (n=19).We compared the procedures among the three groups in term of operation time,intraoperative bleeding,postoperative liver function,postoperative complications,and length of hospital stay.RESULTS:There were no statistically significant differences (P > 0.05) in age,sex,pathological diagnosis,preoperative Child's disease grade,hepatic function,and tumor size among the three groups.No intraoperative complications or deaths occurrred,and there were no significant intergroup differences (P > 0.05) in intraoperative bleeding,hepatic function change 3 and 7 d after operation,the incidence of complications,and length of hospital stay.BIOwHAC and Pringle maneuver required a significantly shorter operation time than HVO;the difference in the serum alanine aminotransferase or aspartate aminotransferase levels before and 1 d after operation was more significant in the BIOwHAC and HVO groups than in the Pringle maneuver group (P < 0.05).CONCLUSION:BIOwHAC is convenient and safe;this technique causes slight hepatic ischemia-reperfusion injury similar to HVO.

关键词： Hepatic blood inflow occlusion without hemihepatic artery control Hepatocellular carcinoma Intraoperative bleeding Ischemia-reperfusion injury

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inflow conditions for spatial direct numerical simulation of turbulent boundary layers

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Science China(Physics,Mechanics & Astronomy) 2008年第8期51卷 1106-1115页

作者： HUANG ZhangFeng & ZHOU Heng Department of Mechanics,Tianjin University,Tianjin 300072,China Liu-Hui Center of Applied Mathematics,Nankai University and Tianjin University,Tianjin 300072,China Department of Mechanics Tianjin University Tianjin China Liu-Hui Center of Applied Mathematics Nankai University and Tianjin University Tianjin China

The inflow conditions for spatial direct numerical simulation(SDNS) of turbulent boundary layers should reflect the characteristics of upstream turbulence,which is a puzzle. In this paper a new method is suggested,in which the flow field obtained by using temporal direct numerical simulation(TDNS) for fully developed turbulent flow(only flow field for a single moment is sufficient) can be used as the inflow of SDNS with a proper transformation. The calculation results confirm that this method is feasible and effective. It is also found that,under a proper time-space transformation,all statistics of the fully developed turbulence obtained by both temporal mode and spatial mode DNS are in excellent agreement with each other,not only qualitatively,but also quantitatively. The normal-wise distributions of mean flow profile,turbulent Mach number and the root mean square(RMS) of the fluctuations of various variables,as well as the Reynolds stresses of the fully developed turbulence obtained by using SDNS,bear similarity in nature.

关键词： inflow conditions spatial direct numerical simulation turbulent boundary layer similarity

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Water inflow forecasting for tunnel considering nonlinear variation of permeability coefficient

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Journal of Central South University 2017年第7期24卷 1612-1618页

作者：程盼赵炼恒张少伟李亮申志强宁鹏飞张泽海 Department of Civil Engineering College of Basic EducationNational University of Defense Technology School of Civil Engineering Central South University

To assess the water inflow which is more suitable to the actual conditions of tunnel,an empirical correlation about the permeability coefficient changing with depth is introduced.Supposing that the surrounding rock is heterogeneous isotropy,the formula for calculating water inflow of tunnel with the nonlinear variation of permeability coefficient is deduced.By the contrast analysis with the existing formulas,the presented method has the similar value to them;moreover,the presented method has more simple form and easy to use.Due to parameter analysis,the water inflow decreases after considering the nonlinear variation of permeability coefficient.When the attenuation coefficient a>0,the water inflow increases first till reaches the maximum at a certain depth,then decreases and is close to 0 finally if deep enough.Thus,it is better to keep away from the certain depth where it is with the maximum water inflow for safe operation and economical construction,and reduce the water damage.Based on the analysis,the radius of tunnel has less impact on the amount of water inflow,and the water inflow just increases by 6.7% when the radius of tunnel increases by 1 m.

关键词： water inflow forecasting heterogeneous isotropy of surrounding rock permeability coefficient tunnel

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Viscous Shock Wave to an inflow Problem for Compressible Viscous Gas with Large Density Oscillations

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Acta Mathematicae Applicatae Sinica 2019年第1期35卷 129-157页

作者： Dong-fen BIAN Li-li FAN Lin HE Hui-jiang ZHAO School of Mathematics and Statistics Beijing Institute of Technology School of Mathematics and Computer Science Wuhan Polytechnic University Institute of Applied Mathematics Academy of Mathematics and Systems Science The Chinese Academy of Sciences School of Mathematics and Statistics Wuhan University Computational Science Hubei Key Laboratory Wuhan University

This paper is concerned with the inflow problem for one-dimensional compressible Navier-Stokes equations. For such a problem, Huang, Matsumura, and Shi showed in [4] that there exists viscous shock wave solution to the inflow problem and both the boundary layer solution, the viscous shock wave, and their superposition are time-asymptotically nonlinear stable provided that both the initial perturbation and the boundary velocity are assumed to be sufficiently small. The main purpose of this paper is to show that similar stability results still hold for a class of large initial perturbation which can allow the initial density to have large oscillations. The proofs are given by an elementary energy method and our main idea is to use the smallness of the strength of the viscous shock wave and the boundary velocity to control the possible growth of the solutions induced by the nonlinearity of the compressible Navier-Stokes equations and the inflow boundary condition.The key point in our analysis is to deduce the desired uniform positive lower and upper bounds on the density.

关键词： compressible Navier-Stokes equations inflow problem viscous shock wave large density oscillations

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Influence of inflow discharge and bed erodibility on outburst flood of landslide dam

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Journal of Mountain Science 2019年第4期16卷 778-792页

作者： ZHOU Ming-jun ZHOU Gordon G.D. CUI Kahlil Fredrick E. SONG Dong-ri LU Xue-qiang Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Accurate prediction of the hydrographs of outburst floods induced by landslide dam overtopping failure is necessary for hazard prevention and mitigation. In this study, flume model tests on the breaching of landslide dams were conducted. Unconsolidated soil materials with wide grain size distributions were used to construct the dam. The effects of different upstream inflow discharges and downstream bed soil erosion on the outburst peak discharge were investigated. Experimental results reveal that the whole hydrodynamic process of landslide dam breaching can be divided into three stages as defined by clear inflection points and peak discharges. The larger the inflow discharge, the shorter the time it takes to reach the peak discharge, and the larger the outburst flood peak discharge. The scale of the outburst floods was found to be amplified by the presence of an erodible bed located downstream of the landslide dam. This amplification decreases with the increase of upstream inflow. In addition, the results show that the existence of an erodible bed increases the density of the outburst flow, increasing its probability of transforming from a sediment flow to a debris flow.

关键词： Landslide dam inflow discharge Erodible bed Outburst flood

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A wake bending unsteady dynamic inflow model of tiltrotor in conversion flight of tiltrotor aircraft

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Science China(Technological Sciences) 2009年第11期52卷 3188-3197页

作者： YUE HaiLong XIA PinQi Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The aerodynamics, dynamic responses and aeroelasticity of tiltrotor aircraft in the tilting of rotor i.e. in conversion flight are extraordinarily complicated. The traditional quasi-steady assumption model can not reflect the unsteady aerodynamic problems in the tilting of rotor. The CFD method based on the vortex theory can get better results, but it consumes a lot of computing resources. In this paper, a wake bending dynamic inflow model of tilting rotor was established firstly based on the Peters-He dynamic inflow model used in helicopter. Then combining with the ONERA unsteady aerodynamic model, a wake bending unsteady dynamic inflow model of tilting rotor in conversion flight of tiltrotor aircraft was established. The wake bending unsteady dynamic inflow model of tilting rotor was verified by using the experimental data of an isolated rotor model in large angle pitching up maneuver and was used to calculate the dynamic responses of tilting rotor in conversion flight of a tiltrotor aircraft model. The calculated results were analyzed to be physically reasonable.

关键词： tiltrotor dynamic inflow wake bending unsteady aerodynamics

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Study on leakage flow characteristics of radial inflow turbines at rotor tip clearance

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Science China(Technological Sciences) 2008年第8期51卷 1125-1136页

作者： DENG QingHua NIU JiuFang FENG ZhenPing Institute of Turbomachinery Xi’an Jiaotong UniversityXi’an 710049China

Tip clearance leakage flow in a radial inflow turbine rotor for microturbines under the stage environment is investigated using a three-dimensional viscous flow simulation. The results indicate that the scraping flow caused by relative motion between casing and rotor tip, and the pressure difference between pressure side and suction side at rotor tip, play important roles in tip clearance leakage flow. The more the rotor tip speed increases and tip clearance height decreases, the more the scraping effect acts. Though the leakage velocity of tip clearance at midsection and exducer regions changes less when the rotor rotational speed is changing, the distance between passage vortex and rotor suction side varies in evidence. Main leakage flow rate of tip clearance takes place at region of exducer tip and some seal configurations will be quite effective for cutting leakage flow if these configurations are arranged over midsection and exducer of the radial inflow rotor.

关键词： microturbine radial inflow turbine rotor tip clearance

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Effects of Heat Intensity and inflow Wind on the Reactive Pollution Dispersion in Urban Street Canyon

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Journal of Shanghai Jiaotong university(Science) 2018年第S1期23卷 109-116页

作者：谢晓敏朱中伟 School of Mechanical Engineering Shanghai Jiao Tong University

This paper investigates the impacts of heating intensity and inflow wind speed on the characteristics of reactive pollutant dispersion in street canyons using the computational fluid dynamic(CFD)model that includes the transportation of NO,NO_2,and O_3coupled with NO-NO_2-O_3photochemistry.The results indicated that the heat intensity and inflow wind speed have a significant influence on the flow field,temperature field and the characteristics of reactive pollutant dispersion in and above the street canyon.With the street canyon bottom heating intensity increasing,NO,NO_2and O_3concentrations in street canyon are decreased.The O_3concentration reductions are even more than the NO and NO_2concentrations.Improving the inflow wind speed can significantly reduce the NO and NO_2concentrations within street canyons.But the O_3concentrations have a slight rise with wind speed increasing.The results would be useful for understanding the interrelation among reactive vehicle emissions,and provide references for urban planners.

关键词： reactive pollutant dispersion street canyon heat intensity inflow wind

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Influence of Ramjets’ Water inflow on Supercavity Shape and Cavitator Drag Characteristics

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Journal of Marine Science and Application 2017年第2期16卷 166-172页

作者： Chuang Huang Jianjun Dang Kai Luo Daijin Li Zhiqiang Wang School of Marine Science and Technology Northwestern Polytechnical University Xi’an 710072 China Xi'an Institute of Optics and Precision Mechanics of CAS Xi’an 710119 China

Water ramjets using outer water as an oxidizer have been demonstrated as a potential propulsion mode for underwater High Speed Supercavitating Vehicles (HSSVs) because of their higher energy density, power density, and specific impulse, but water flux changes the shapes of supercavity. To uncover the cavitator drag characteristics and the supercavity shape of HSSVs with water inflow for ramjets, supercavitation flows around a disk cavitator with inlet hole are studied using the homogenous model. By changing the water inflow in the range of 0-10 L/s through cavitators having different water inlet areas, a series of numerical simulations of supercavitation flows was performed. The water inflow flux of ramjets significantly influences the drag features of disk cavitators and the supercavity shape, but it has little influence on the slender ratio of supercavitaty. Furthermore, as the water inlet area increases, the drag coefficient of the cavitators' front face decreases, but this increase does not influence the diameter of the supercavity's maximum cross section and the drag coefficient of the entire cavitator significantly. In addition, with increasing waterflux of the ramjet, both the drag coefficient of cavitators and the maximum diameter of supercavities decrease stably. This research will be helpful for layout optimization and supercavitaty scheme design of HSSVs with water inflow for ramjets.

关键词： ramjet water inflow disk cavitator supercavitaty shape drag characteristic high speed supercavitating vehicles

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