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Search Results: 1 - 10 of 87607 matches for " TAO Guo ZHU Ke-Qin "
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YUE Wen-Zheng,TAO Guo ZHU Ke-Qin,
,陶 果,朱克勤

地球物理学报 , 2004,
Abstract: We use lattice gas automation to simulate the electrical transport properties of saturated rocks by computer with different water saturation and porosity, grain shape of matrix. The result shows the nature of non-Archie relation between resistivity index and water saturation. Saturation exponent n is not a constant as the traditional idea expected but a function of water saturation and porosity. It is a reflection of complexity-change rate of conductive path with water saturation. A new method is presented in this paper to calculate water saturation. The high efficiency of this method can be proved by comparing calculated result with rock experiments in field application.
Simulation of electrical transport properties in oil-water saturated porous media with 2-D lattice gas automata

YUE Wen-Zheng,TAO Guo,ZHU Ke-Qin,

地球物理学报 , 2005,
Abstract: 本文应用 2_D格子气自动机模拟饱和油水两相的多孔介质的导电特性 .在油水两相界面处 ,引入反射与透射系数来决定粒子的运动状态 ,通过调节反射与透射系数就可以改变油水两相的导电性差异 .用模拟结果考察Archie公式的地层因素F =Ro Rw 和电阻率增大系数I=Rt Ro,其中 ,Ro 为百分之百饱和水时的岩石电阻率 ,Rw为水的电阻率 ,Rt 为不同流体饱和度时的岩石电阻率 .结果表明F与孔隙度 φ间 ,I与含水饱和度间都存在幂关系 ,并可以表示为F =aφ-m ,I=bS-nw 模拟结果同时证实 :公式中的参数a、m的变化反映了孔隙微观结构的变化 ,参数b、n主要受孔隙度大小和油相分布状态的影响 .
The simulation of conductivity of binary mixtures with lattices Boltzmann method

YUE Wen-Zheng,LI Zheng,ZHU Ke-Qin,Tao Guo,

地球物理学报 , 2005,
Abstract: The Lattice Boltzmann Method (LBM) is employed to simulate the conductivity of binary mixtures. The conductivity is affected by the conductivity of each component, volume fraction and structure of mixtures. The simulated results of conductivity for the binary mixtures in the serial and parallel modes are in agreement with the analytical solution to show the reliable of the LBM. The conductivity of the models with a random distribution of inclusion, obtained by the LBM, falls into the area predicted by H-S theory. The LBM is believed to be an efficient way to investigate the conductivity and the dielectric constant for the agreement between the simulation of the conductivity of Al-Bi alloy, the dielectric constant of saturated rock and laboratory experiments of them.
Protective Effects of Garlic Oil on Hepatocarcinoma Induced by N-Nitrosodiethylamine in Rats
Cui-Li Zhang, Tao Zeng, Xiu-Lan Zhao, Li-Hua Yu, Zhen-Ping Zhu, Ke-Qin Xie
International Journal of Biological Sciences , 2012,
Abstract: To investigate the protective effects and the possible mechanisms of garlic oil (GO) against N-nitrosodiethylamine (NDEA)-induced hepatocarcinoma in rats, Wistar rats were gavaged with GO (20 or 40 mg/kg) for 1 week, and then were gavaged with GO and NDEA (10 mg/kg) for the next 20 weeks. The changes of morphology, histology, the biochemical indices of serum, and DNA oxidative damage of liver were examined to assess the protective effects. Lipid peroxidation (LPO), antioxidant defense system, and apoptosis-related proteins were measured to investigate potential mechanisms. At the end of the study (21 weeks), GO administration significantly inhibited the increase of the nodule incidence and average nodule number per nodule-bearing liver induced by NDEA, improved hepatocellular architecture, and dramatically inhibited NDEA-induced elevation of serum biochemical indices (alanine aminotransferase , aspartate aminotransferase, alkaline phosphatase and gamma-glutamyl transpeptidase) and hepatic 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels in a dose-dependent manner. The mechanistic studies demonstrated that GO counteracted NDEA-induced oxidative stress in rats illustrated by the restoration of glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), glutathione peroxidase (GPx), glutathione-S-transferase (GST) levels, and the reduction of the malondialdehyde (MDA) levels in liver. Furthermore, the mRNA and protein levels of Bcl-2, Bcl-xl, andβ-arrestin-2 were significantly decreased whereas those of Bax and caspase-3 were significantly increased. These data suggest that GO exhibited significant protection against NDEA-induced hepatocarcinogenesis, which might be related with the enhancement of the antioxidant activity and the induction of apoptosis.
Roles of Cytochrome P4502E1 Gene Polymorphisms and the Risks of Alcoholic Liver Disease: A Meta-Analysis
Tao Zeng, Fang-Fang Guo, Cui-Li Zhang, Fu-Yong Song, Xiu-Lan Zhao, Ke-Qin Xie
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0054188
Abstract: Background Previous studies investigating the association between cytochrome P4502E1 (CYP2E1) polymorphisms and the risk of alcoholic liver diseases (ALD) have yielded conflicting results. Thus, a meta-analysis was performed to clarify the association between CYP2E1 polymorphisms and the risks of ALD. Methods A comprehensive literature search was conducted to identify the relevant studies. The fixed or random effect model was selected based on the heterogeneity test among studies. Publication bias was estimated using Begg’s funnel plots and Egger’s regression test. Results A total of 27 and 9 studies were finally included for the association between the CYP2E1 Pst I/Rsa I or Dra I polymorphisms and the risks of ALD, respectively. Overall, the combined results showed that homozygous genotype c2c2 was significantly associated with increase risk of ALD in worldwide populations (c2c2 vs. c1c1: OR = 3.12, 95%CI 1.91–5.11) when ALD patients were compared with alcoholics without ALD. Significant associations between CYP2E1 Pst I/Rsa I polymorphism and ALD risk were also observed in Asians (c2c2 vs. c1c1: OR = 4.11, 95%CI 2.32–7.29) and in Caucasians (c2c2/c1c2 vs. c1c1: OR = 1.58, 95%CI 1.04–2.42) when ALD patients were compared with alcoholics without ALD. However, subgroup analysis stratified by ALD types showed that CYP2E1 Pst I/Rsa I polymorphism was not significantly associated with the risks of alcoholic cirrhosis (ALC). No significant association was observed between CYP2E1 Dra I polymorphism and ALD risks. Conclusion This meta-analysis suggested that CYP2E1 Pst I/Rsa I polymorphism might be not significantly associated with advanced form of ALD (ALC), but might be significantly associated with other form of ALD such as steatosis, hepatisis, fibrosis. Furthermore, CYP2E1 Dra I polymorphism might be not significantly associated with the ALD risks. Since potential confounders could not be ruled out completely, further studies were needed to confirm these results.
Can We Obtain a Fractional Lorenz System from a Physical Problem?

YANG Fan,ZHU Ke-Qin,

中国物理快报 , 2010,
Role of Viscosity Stratification and Insoluble Surfactant in Instability of Two-Layer Channel Flow

PENG Jie,ZHU Ke-Qin,

中国物理快报 , 2010,
Start-up flow of a viscoelastic fluid in a pipe with fractional Maxwell's model
Di Yang,Ke-Qin Zhu
Mathematics , 2010,
Abstract: Unidirectional start-up flow of a viscoelastic fluid in a pipe with fractional Maxwell's model is studied. The flow starting from rest is driven by a constant pressure gradient in an infinite long straight pipe. By employing the method of variable separations and Heaviside operational calculus, we obtain the exact solution, from which the flow characteristics are investigated. It is found that the start-up motion of fractional Maxwell's fluid with parameters $\alpha$ and $\beta$, tends to be at rest as time goes to infinity, except the case of $\beta=1$. This observation, which also can be predicted from the mechanics analogue of fractional Maxwell's model, agrees with the classical work of Friedrich and it indicates fractional Maxwell's fluid presents solid-like behavior if $\be\neq 1$ and fluid-like behavior if $\be=1$. For an arbitrary viscoelastic model, a conjecture is proposed to give an intuitive way judging whether it presents fluid-like or solid-like behavior. Also oscillations may occur before the fluid tends to the asymptotic behavior stated above, which is a common phenomenon for viscoelastic fluids.
A Practical Approach to Management of Chronic Hepatitis B
Hu Ke-Qin
International Journal of Medical Sciences , 2005,
Abstract: Chronic hepatitis B (CHB) is one of the important public health problems worldwide. Major advances have been made in the treatment of CHB during the past several years. This article systemically reviews advances in the application of HBV DNA quantitation and three approved drugs for HBV treatment, and presents an updated and practical clinical approach to managing CHB. Highly sensitive PCR-based quantitation of HBV DNA makes it possible to precisely determine pre-treatment HBV load and monitor HBV DNA response during treatment. HBV DNA level, HBeAg status, degree of hepatic histological activity and fibrosis, and serum transaminases are the most important parameters in determining indication, regimen, and duration of HBV treatment. Although interferon alfa-2b, lamivudine, and adefovir are all approved as initial HBV treatment, understanding the advantages and advantages of each agent is important in choosing the best treatment for each individual patient with CHB.
Guest Editor's Editorial: Advances in Managing Hepatitis C Virus (HCV) Infection (A Special Issue)
Hu Ke-Qin
International Journal of Medical Sciences , 2006,
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