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457 results on '"Cui, Chuan"'

101. Identification and quantitative description of large pore path in unconsolidated sandstone reservoir during the ultra-high water-cut stage

Author

Cui Chuan-zhi, Huang Yingsong, Li Kaikai, Cao Qi, and Yang Yong

Subjects
Permeability (earth sciences), Fuel Technology, Petroleum engineering, Computer simulation, Water cut, Fluvial, Sedimentary rock, Geotechnical Engineering and Engineering Geology, Petrology, Relative permeability, Geology, Identification criteria, Large pore
Abstract

In unconsolidated sandstone reservoirs associated with fluvial sedimentation, large pore paths are likely to be formed under the long-term scour action of injected water. In this paper, the high-velocity non-Darcy flowing characteristics in large pore paths were analyzed. Based on the identification criteria for high-velocity non-Darcy flow, the identification criteria for large pore paths are established. According to the characteristic parameters of 101 relative permeability curves from the fluvial sedimentary units of the uncompartmentalized oilfields in Shengli oil region, the relation formulae between characteristic parameters of relative permeability curve and permeability are established. Considering the change of reservoir permeability and the relative permeability curve with permeability, a reservoir numerical simulation model is setup. The Ng63+4 development unit of the west seventh block of Gudong Oilfield is taken as a typical reservoir. The distribution position, area and volume of the large pore paths in Ng63+4 development unit are quantitatively described. The results show that the identification criteria of large pore paths which take into consideration the water–oil well spacing, production pressure difference and permeability can be used in the reservoir numerical simulation results to describe the large pore paths.

Published
2014
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102. Lipopolysaccharide-Nuclear Factor-Kappa B Pathway and Lipoprotein Apheresis Effects in Patients with Familial Hypercholesterolemia and Coronary Artery Disease

Author

Liu, Hui-Hui, primary, Zhu, Cheng-Gang, additional, Cui, Chuan-Jue, additional, Cao, Ye-Xuan, additional, Sun, Di, additional, Wu, Na-Qiong, additional, Guo, Yuan-Lin, additional, Gao, Ying, additional, Dong, Qiu-Ting, additional, Santos, Raul D., additional, and Li, Jian-Jun, additional

Published
2019
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103. Genetic basis of index patients with familial hypercholesterolemia in Chinese population: mutation spectrum and genotype-phenotype correlation

Author

Sun, Di, primary, Zhou, Bing-Yang, additional, Li, Sha, additional, Sun, Ning-Ling, additional, Hua, Qi, additional, Wu, Shu-Lin, additional, Cao, Yun-Shan, additional, Guo, Yuan-Lin, additional, Wu, Na-Qiong, additional, Zhu, Cheng-Gang, additional, Gao, Ying, additional, Cui, Chuan-Jue, additional, Liu, Geng, additional, and Li, Jian-Jun, additional

Published
2018
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110. Large HDL Subfraction But Not HDL-C Is Closely Linked With Risk Factors, Coronary Severity and Outcomes in a Cohort of Nontreated Patients With Stable Coronary Artery Disease

Author

Li, Jian-Jun, Zhang, Yan, Li, Sha, Cui, Chuan-Jue, Zhu, Cheng-Gang, Guo, Yuan-Lin, Wu, Na-Qiong, Xu, Rui-Xia, Liu, Geng, Dong, Qian, and Sun, Jing

Subjects
Male, Cholesterol, HDL, Myocardial Infarction, nutritional and metabolic diseases, Observational Study, Coronary Artery Disease, Middle Aged, Severity of Illness Index, Stroke, Percutaneous Coronary Intervention, Predictive Value of Tests, Risk Factors, Humans, lipids (amino acids, peptides, and proteins), Female, Prospective Studies, Coronary Artery Bypass, Lipoproteins, HDL, Research Article, Aged
Abstract

High-density lipoprotein (HDL) is highly heterogeneous in its size and composition. Till now, the link of HDL subfractions to coronary risk is less clear. We aimed to investigate the associations of HDL subfractions with traditional risk factors (RFs), coronary severity, and outcomes in a cohort of nontreated patients with stable coronary artery disease (CAD). We prospectively enrolled 591 eligible patients. Baseline HDL subfractions were separated by Lipoprint system. HDL subfractions (large, medium, and small) and HDL-cholesterol (HDL-C) levels were dichotomized into low and high group according to the 50 percentile. Coronary severity was evaluated by SYNTAX, Gensini, and Jeopardy scoring systems. Patients were followed up annually for major adverse cardiovascular events (MACEs). Cox proportional hazards’ models were used to evaluate the risk of HDL subfractions on MACEs. Patients with high large HDL-C levels had a decreased number of RFs. Significantly, large HDL-C levels were negatively associated with coronary severity assessed by SYNTAX and Gensini score (both P 0.05). In particular, the multivariate Cox-proportional hazards model revealed that high large HDL-C was associated with lower MACEs risk (hazard ratio [95% confidence interval] 0.531 [0.295–0.959]) independent of potential confounders. Higher large HDL-C but not medium, small, or total HDL-C is associated with lower cardiovascular risk, highlighting the potential beneficial of HDL subfractionation.

Published
2016

111. Elevated resting heart rate is associated with the severity of coronary artery disease in non-treated patients who underwent coronary angiography: potential role of lipoprotein subfractions

Author

Zhang, Yan, primary, Wu, Na-Qiong, additional, Xu, Rui-Xia, additional, Li, Sha, additional, Zhu, Cheng-Gang, additional, Guo, Yuan-Lin, additional, Gao, Ying, additional, Qing, Ping, additional, Cui, Chuan-Jue, additional, Sun, Jing, additional, and Li, Jian-Jun, additional

Published
2017
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112. Serum fibrinogen and cardiovascular events in Chinese patients with type 2 diabetes and stable coronary artery disease: a prospective observational study

Author

Yang, Sheng-Hua, primary, Du, Ying, additional, Zhang, Yan, additional, Li, Xiao-Lin, additional, Li, Sha, additional, Xu, Rui-Xia, additional, Zhu, Cheng-Gang, additional, Guo, Yuan-Lin, additional, Wu, Na-Qiong, additional, Qing, Ping, additional, Gao, Ying, additional, Cui, Chuan-Jue, additional, Dong, Qian, additional, Sun, Jing, additional, and Li, Jian-Jun, additional

Published
2017
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116. Nonlinear Mechanical Properties of Polymorphic CsPbI3Perovskite from Reactive Molecular Dynamics Simulations

Author

Cui, Chuan-Xin and Jiang, Jin-Wu

Abstract

All-inorganic cesium lead triiodide (CsPbI3) perovskite makes efficient solar cells, for which the nonlinear induced fracture properties are important for its mechanical stability, but these nonlinear mechanical behaviors under finite deformation remain unclear. Here, we perform reactive molecular dynamics simulations to investigate the mechanical properties of CsPbI3of different phases under finite deformation. Our simulations reveal that Young’s modulus and Poisson’s ratio exhibit anisotropy in the linear elastic region. The orthorhombic phase exhibits a lower hardness and higher flexibility compared to the tetragonal and cubic phases, resulting in higher susceptibility to stress. The average atomic charge decreases with increasing strain and concentrates at the cracks during fracture progress. We also discover that negative Poisson’s ratio occurs in the xz-direction during finite deformation of tetragonal and orthorhombic phases, which is well explained by the Pb–I–Pb angle perpendicular to the xy-plane. Our findings provide valuable insights into the mechanical behavior and fracture characteristics of CsPbI3perovskite, which have important implications for designing perovskite-based devices for different applications.

Published
2024
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120. Notice of Retraction: Genetic algorithm principle and the application in oilfield development

Author

Cui Chuan-zhi

Subjects
Mathematical optimization, Space technology, Engineering, Random search, Production planning, Meta-optimization, Robustness (computer science), business.industry, Genetic algorithm, Algorithm design, business, Global optimization
Abstract

The genetic algorithm is a global optimization method and good at flexibility and robustness. It conducts undirected random search, which is not limited by search space. The computational procedure of the algorithm is easy and simple. The genetic algorithm is especially suited to solve multivariate and nonlinear complex problems which are impossible or difficult to be settled by other scientific technologies. The paper introduces the current wide application of genetic algorithm in oil-field development planning, measure optimization, well location deployment, multilateral well design, well testing, steam stimulation, the design of oil production technologies, and so on, which represents the algorithm's advantages in solving problems of oil field development, and reveals the wide ranging application prospect in the field of oilfield development.

Published
2010
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121. Gas productivity analysis of high speed non-Darcy flow in deformed media gas reservoir

Author

Cui Chuan-zhi

Subjects
Permeability (earth sciences), Engineering, Real gas, Darcy's law, Petroleum engineering, business.industry, Wet gas, Gas industry, Porosity, business, Bottom hole pressure
Abstract

The gas producivity is infuluenced by many factors. In the routine calculation of gas productivity, many factors were negelected for convenience such as the non-Darcy flow, the changes of gas PVT parameters and the deformation of rock media. In order to analysis the effect of these factors on gas productivity, the mathematical model of high speed non-Darcy unstable flow in deformed media gas reservoir, which takes the changes of PVT of real gas with pressure into consideration, has been made in this paper. Numerical difference technology is used to find solution to the mathematical model,in which there is a well in the center of the round closed layer and the well bottom hole pressure is kept as constant in the production. And the effect of the factors on the gas productivity is analyzed. The results show that the influences of porosity changes caused by media deformation to productivity can be neglected, the changes of permeability can lead to the decreasing of productivity in the early period. And the productivity under the conditions of the high-speed non-Darcy flow and the changes of gas PVT is higher than the one when the gas flow is linear and PVT of gas is constant. These research results are meaningful to predict the gas productivity accurately.

Published
2010
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122. Notice of Retraction: Analysis and trace of the influencing factors of oilfield production decline based on the grey interconnect analysis method

Author

Cui Chuan-zhi and Zhao Xiao-yan

Subjects
Interconnection, Engineering, Petroleum engineering, Water cut, business.industry, Statistics, Production (economics), Gas industry, business, Water production, Analysis method, TRACE (psycholinguistics)
Abstract

The grey interconnect analysis method is used in two aspects in this paper. One is to decide the main factor which have great effect on the production decline rate, the other is to select the main wells which have great effect on the main factor. On the first aspect, the affecting factors which are independent and have direct influence on the decline rate are normalized respectively. Then the interconnect sequence of the affecting factors are obtained by using the grey interconnect analysis method. On the second aspect, the water cut is taken as the reference sequence, the water production rate of every wells is taken as the factors sequence, then the main wells which have great effect on the water cut are selected by using the Grey interconnect analysis method. The results shows that the grey interconnect analysis method can adapt to the features of the more influence factors and the larger date size, and can be used in the analysis and trace for affecting factos of production decline.

Published
2010
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126. Genetic polymorphisms of PDGFR/VEGFR2/VEGFR3/RET and their relevance to thrombocytopenia in mRCC patients treated with sunitinib.

Author

Sheng, Xi Nan, primary, Kong, Yan, additional, Chi, Zhihong, additional, Cui, Chuan Liang, additional, Si, Lu, additional, Mao, Li Li, additional, Lian, Bin, additional, Li, Si Ming, additional, Tang, Bixia, additional, Wang, Xuan, additional, Yan, Xieqiao, additional, Dai, Jie, additional, and Guo, Jun, additional

Published
2015
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133. A pilot, open-label phase II study of sorafenib combined with cisplatin plus gemcitabine for the treatment of patients with advanced renal collecting duct carcinoma.

Author

Sheng, Xi Nan, primary, Cui, Chuan Liang, additional, Chi, Zhihong, additional, Si, Lu, additional, Li, Si Ming, additional, Mao, Li Li, additional, Lian, Bin, additional, Tang, Bi Xia, additional, Wang, Xuan, additional, Kong, Yan, additional, Xie, Xiaodong, additional, Zhou, Fang-Jian, additional, Yuan, Jian-lin, additional, Wei, Qiang, additional, and Guo, Jun, additional

Published
2014
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143. Enhanced pro-protein convertase subtilisin/kexin type 9 expression by C-reactive protein through p38 MAPK- HNF1α pathway in HepG2 cells.

Author

Cui, Chuan‐Jue, Li, Sha, Zhu, Cheng‐Gang, Sun, Jing, Du, Ying, Zhang, Yan, Wu, Na‐Qiong, Guo, Yuan‐Lin, Xu, Rui‐Xia, Gao, Ying, and Li, Jian‐Jun

Subjects
PROPROTEIN convertases, SUBTILISINS, GENE expression, C-reactive protein, CARDIOVASCULAR diseases risk factors
Abstract

Plasma C-reactive protein ( CRP) concentration is associated positively with cardiovascular risk, including dyslipidemia. We suggested a regulating role of CRP on pro-protein convertase subtilisin/kexin type 9 ( PCSK9), a key regulator of low-density lipoprotein ( LDL) metabolism, and demonstrated the PCSK9 as a pathway linking CRP and LDL regulation. Firstly, experiments were carried out in the presence of human CRP on the protein and mRNA expression of PCSK9 and LDL receptor ( LDLR) in human hepatoma cell line HepG2 cells. Treatment with CRP (10 μg/ml) enhanced significantly the mRNA and protein expression of PCSK9 and suppressed the expression of LDLR. Of note, a late return of LDLR mRNA levels occurred at 12 hrs, while the LDLR protein continued to decrease at 24 hrs, suggesting that the late decrease in LDLR protein levels was unlikely to be accounted for the decrease in LDL mRNA. Secondly, the role of PCSK9 in CRP-induced LDLR decrease and the underlying pathways were investigated. As a result, the inhibition of PCSK9 expression by small interfering RNA (si RNA) returned partly the level of LDLR protein and LDL uptake during CRP treatment; CRP-induced PCSK9 increase was inhibited by the p38 MAPK inhibitor, SB203580, resulting in a significant rescue of LDLR protein expression and LDL uptake; the pathway was involved in hepatocyte nuclear factor 1α ( HNF1α) but not sterol responsive element-binding proteins ( SREBPs) preceded by the phosphorylation of p38 MAPK. These findings indicated that CRP increased PCSK9 expression by activating p38 MAPK- HNF1α pathway, with a certain downstream impairment in LDL metabolism in HepG2 cells. [ABSTRACT FROM AUTHOR]

Published
2016
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144. Chemical Solution-Derived YBaCu O /CuO Multilayer Structure-Coated Conductors on Oxide-Buffered Metallic Tapes.

Author

Cui, Chuan-Wei, Yang, Wen-Tao, Liu, Zhi-Yong, Bai, Chuan-Yi, Liu, Xu-Ming, Zhai, Wei, Peng, Chang-Hao, and Cai, Chuan-Bing

Subjects
CHEMICAL solution deposition, YTTRIUM barium copper oxide films, SUPERCONDUCTING tape, ELECTRIC properties of yttrium barium copper oxide, ORGANOMETALLIC compounds, BIOCHEMICAL substrates, SOLUTION (Chemistry)
Abstract

An approach based on the insertion of a CuO layer in YBaCu O (YBCO)-coated conductor was proposed and demonstrates high current-carrying ability. The multilayer architecture was deposited on oxid-buffered Hastelloy tapes using a metal organic deposition (MOD) process (low-fluorine solution route). It was revealed that the introduction of a CuO layer was effective to avoid the presence of a-axis grain and pores of the YBCO films, which were frequently observed in multilayer films. Presently, the thickness of the multilayer films was almost 1.5 µm. Based on the improvements of the surface quality and c-oriented texture which were proved by X-ray ( ??-2 ??, f, and ?)-scan, AFM images, and SEM (surface and cross-section) images, the critical current density (Jc) of YBCO films with middle CuO and bottom CuO are 2.0 MA/cm and 2.5 MA/cm (at 77 K, self-field), respectively. [ABSTRACT FROM AUTHOR]

Published
2016
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