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Study of the mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery for post-polymer-flooded reservoirs

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Petroleum Science 2019年第3期16卷 606-618页

作者： Qing-Jun Du Guang-Ming Pan jian Hou Lan-Lei guo rong-rong Wang Zhi-Zeng Xia Kang Zhou Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education Qingdao 266580 Shandong P. R. China School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 Shandong P. R. China Bohai Petroleum Research Institution Tianjin Branch of CNOOC Ltd Tianjin 300452 P. R. China Research Institute of Exploration and Development Shengli Oilfield SINOPEC Dongying 257061 Shandong P. R.China

Streamline-adjustment-assisted heterogeneous combination flooding is a new technology for enhanced oil recovery for post-polymer-flooded *** this work,we first carried out a series of 2D visualization experiments for different chemical flooding scenarios after polymer ***,we explored the synergistic mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery and the contribution of each *** results show that for single heterogeneous combination flooding,the residual oil in the main streamline area after polymer flooding is ready to be driven,but it is difficult to be recovered in the non-main streamline *** to the effect of drainage and synergism,the streamline-adjustment-assisted heterogeneous combination flooding diverts the injected chemical agent from the main streamline area to the non-main streamline area,which consequently expands the active area of chemical *** on the results from the single-factor contribution of the quantitative analysis,the contribution of temporary plugging and profile control of branched preformed particle gels ranks in the first place and followed by the polymer profile control and the effect of streamline *** the contrary,the surfactant contributes the least to enhance the efficiency of oil displacement.

关键词： Plate sand-pack model Heterogeneous combination flooding Streamline adjustment Polymer flooding Displacement

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Hot deformation mechanism and microstructure evolution of an ultra-high nitrogen austenitic steel containing Nb and V

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1043-1049页

作者： rong-hua Zhang Ze-an Zhou Ming-wei guo jian-jun Qi Shu-hua Sun Wan-tang Fu State Key Laboratory of Metastable Materials Science and Technology Yanshan University College of Metallurgy and Energy Hebei United University

The flow curves of an ultra-high nitrogen austenitic steel containing niobium(Nb) and vanadium(V) were obtained by hot compression deformation at temperatures ranging from 1000°C to 1200°C and strain rates ranging from 0.001 s-1 to 10 s-1. The mechanical behavior during hot deformation was discussed on the basis of flow curves and hot processing maps. The microstructures were analyzed via scanning electron microscopy and electron backscatter diffraction. The relationship between deformation conditions and grain size after dynamic recrystallization was obtained. The results show that the flow stress and peak strain both increase with decreasing temperature and increasing strain rate. The hot deformation activation energy is approximately 631 k J/mol, and a hot deformation equation is proposed.(Nb,V)N precipitates with either round, square, or irregular shapes are observed at the grain boundaries and in the matrix after deformation. According to the discussion, the hot working should be processed in the temperature range of 1050°C to 1150°C and in the strain rate range of 0.01 to 1 s-1.

关键词： austenitic steels hot deformation microstructural

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ATTRACTORS FOR DISCRETIZATION OF GINZBURG-LANDAU-BBM EQUATIONS

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Journal of Computational Mathematics 2001年第2期19卷 195-204页

作者： Mu-rong jiang Bo-ling guo Department of Mathematics Yunnan UniversityKunming 650091China R&D Center for Parallel Software Institute of SoftwareChinese Academy of SciencesBeijing 100080China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Focuses on a study which discreted Ginzburg-Landau-BBM equations with periodic initial boundary value conditions by the finite difference method in spatial direction. Background on the discretization of the equations and the priori estimates; Existence of the attractors for the discrete system; Estimates of the upper bounds of Hausdorff and fractal dimensions for the attractors.

关键词： attractor spatially discreted Ginzburg-Landau-BBM equations Hausdorff and fractal dimensions

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Recovery of greenhouse gas as cleaner fossil fuel contributes to carbon neutrality

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Green Energy & Environment 2023年第2期8卷 351-353页

作者： Xin Zhang jian-rong Li Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemical Engineering Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

Under the context of carbon neutrality of China,it is urgent to shift our energy supply towards cleaner fuels as well as to reduce the greenhouse gas ***,coal is the main fossil fuel energy source of *** country is striving hard to replace it with methane,a cleaner fossil *** China has rich geological resources of methane as coal bed methane(CBM)reserves,it is quite challenging to utilize them due to low *** CBM is however mainly emitted directly to atmosphere during coal mining,causing waste of the resource and huge contribution to greenhouse *** recent work by Yang et *** a potential solution to extract low concentration methane selectively from CBM through using MOF materials as *** kind of materials and associated separation technology are promising to reduce greenhouse gas emission and promote the methane production capability,which would contribute to carbon neutrality in dual pathways.

关键词： Carbon neutrality Coal bed methane Metal–organic frameworks Greenhouse gas Fossil fuel

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Analytic Solutions of an Iterative Differential Equation under Brjuno Condition

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Acta Mathematica Sinica,English Series 2009年第9期25卷 1469-1482页

作者： jian LIU jian guo SI School of Science University of Ji'nan Ji'nan 250022 P.R. China School of Mathematics Shandong University Ji'nan 250100 P.R. China

In this paper, the differential equation involving iterates of the unknown function,x＇（z）=[a^2-x^2（z）]x^[m]（z）with a complex parameter a, is investigated in the complex field C for the existence of analytic solutions. First of all, we discuss the existence and the continuous dependence on the parameter a of analytic solution for the above equation, by making use of Banach fixed point theorem. Then, as well as in many previous works, we reduce the equation with the SchrSder transformation x（z） = y（αy^-1（z）） to the following another functional differential equation without iteration of the unknown functionαy＇（αz）=[a^2-y^2（αz）]y＇（z）y（α^mz）,which is called an auxiliary equation. By constructing local invertible analytic solutions of the auxiliary equation, analytic solutions of the form y（αy^-1 （z）） for the original iterative differential equation are obtained. We discuss not only these α given in SchrSder transformation in the hyperbolic case 0 〈｜α｜〈 1 and resonance, i.e., at a root of the unity, but also those α near resonance （i.e., near a root of the unity） under Brjuno condition. Finally, we introduce explicit analytic solutions for the original iterative differential equation by means of a recurrent formula, and give some particular solutions in the form of power functions when a = 0.

关键词： iterative differential equation analytic solution Banach fixed point theorem resonance Diophantine condition Brjuno condition

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On the Eventual Shadowing Property and Eventually Shadowable Point of Set-valued Dynamical Systems

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Acta Mathematica Sinica,English Series 2022年第6期38卷 1105-1115页

作者： Xue rong XIE jian Dong YIN Department of Mathematics Nanchang UniversityNanchang 330031P.R.China

The authors introduce the concepts of the eventual shadowing property and eventually shadowable point for set-valued dynamical systems and prove that a set-valued dynamical system has the eventual shadowing property if and only if every point in the phase space is eventually shadowable;every chain transitive set-valued dynamical system has either the eventual shadowing property or no eventually shadowable points;and a set-valued dynamical system admits an eventually shadowable point if and only if it admits a minimal eventually shadowable ***,it is proved that a set-valued dynamical system with the eventual shadowing property is chain mixing if and only if it is mixing and if and only if it has the specification property.

关键词： Eventual shadowing property eventually shadowable point set-valued dynamical system specification

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Special Issue on Electromechanical Coupling Design for Electronic Equipment

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 495-496页

作者： Bao Yan DUAN jian rong TAN Key Laboratory of Electronic Equipment Structure Design of Ministry of Education Xidian University State Key Lab of CAD&CG Zhejiang University

With the development of electronic equipment to high accuracy, high density, high frequency, and atrocious ser- vice environment, the functional surface in this type of equipment has increasingly serious problems,

关键词： In Special Issue on Electromechanical Coupling Design for Electronic Equipment Design

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CD44v6 in peripheral blood and bone marrow of patients with gastric cancer as micro-metastasis

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World Journal of Gastroenterology 2006年第1期12卷 36-42页

作者： Dao-rong Wang guo-Yu Chen Xun-Liang Liu Yi Miao jian-guo Xia Lin-Hai Zhu Dong Tang Departmentof General Surgery the First Affiliated Hospital of YangzhouUniversity Yangzhou 225001 Jiangsu Province China Department of General Surgery the First Affiliated Hospital ofNanjing Medical University Nanjing 220029 Jiangsu ProvinceChina

AIM： To detect the expression of CD44 correlated with the ability of micro-metastasis in peripheral blood and bone marrow of patients with gastric cancer and to deduce its clinical significance. METHODS： Preoperative peripheral blood and bone marrow specimens from 46 patients with gastric cancer and 6 controls were studied by semi-quantitative RTPCR amplification of CD44v6mRNA. Preoperative and postoperative peripheral blood specimens from 40 patients with gastric cancer and 14 controls were studied by quantitative RT-PCR amplification of CD44v6mRNA in the corresponding period. RESULTS： Semi-quantitative RT-PCR amplification showed that CD44v6mRNA expression of peripheral blood and bone marrow was positive in 39 （84.8%） and 40 （86.9%） of 46 patients with gastric cancer, respectively. In peripheral blood, CD44v6mRNA expression was positive for diffuse type in 30 （93.8%） of 32 patients and for intestinal type in 9 （64.3%） of 14 patients. On the other hand, in bone marrow, CD44v6mRNA expression was positive for diffuse type in 31 （96.9%） of 32 patients and for intestinal type in 10 （71.4%） of 14 patients. There was a significant difference between the diffuse type and intestinal type. Quantitative RTopCR amplification demonstrated that CD44v6mRNA was not expressed in the peripheral blood of controls and CD44v6mRNA expression was positive for preoperative peripheral blood in 40 patients with gastric cancer, the expression levels being from 4.9 × 10^2 to 3.2× 10^5 copies/g RNA. The average expression level of CD44v6mRNA in peripheral blood was 3.9 × 10^10 copies/g RNA. The expression levels of CD44v6mRNA in peripheral blood in gastric cancer patients after curative operation increased from 5.5 × 100 to 7.6 × 10 copies/g RNA （P = 0.00496）. After curative operation, the expression level decreased markedly. CONCLUSION： Semi-quantitative and quantitative RTPCR amplification for CD44v6mRNA is a sensitive and specific method for the detection of micro-metastasis in periphera

关键词： Gastric cancer Micro-metastasis Peripheral blood Bone marrow CD44v6

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Observational signatures of close binaries of supermassive black holes in active galactic nuclei

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Research in Astronomy and Astrophysics 2020年第10期20卷 191-206页

作者： jian-Min Wang Yan-rong Li Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Inspired by the General Relativity for many decades,experimental physicists and astronomers have a solid dream to detect gravitational waves(GWs)from mergers of black holes,which came true until the excellent performance of the Laser Interferometer Gravitational-Wave Observatory(LIGO)at hundreds ***-Hz GWs are expected to be radiated by close-binaries of supermassive black holes(CB-SMBHs;defined as those with separations less than^0.1 pc)formed during galaxy mergers and detected through the Pulsar Timing Array(PTA)*** of the writing,there remains no nano-Hz GWs *** for CB-SMBHs is also observationally elusive though there exist a number of possible *** this review,we focus on observational signatures of CB-SMBHs from theoretic expectations,simulations and *** signatures appear in energy distributions of multiwavelength continuum,long term variations of continuum,jet morphology,reverberation delay maps and spectroastrometry of broad emission lines,AGN type transitions between type-1 and type-2(changing-look),and gaseous dynamics of circumbinary disks,*** hundred-Hz GWs from stellar mass black hole binaries,the waveform chirping of nano-Hz GWs is too slow to detect in a reasonable human *** have to resort to electromagnetic observations to measure orbital parameters of CB-SMBHs to test nano-Hz GW *** mapping is a powerful tool for probing kinematics and geometry of ionized gas in the gravitational well of SMBHs(single or binary)and therefore provides a potential way to determine orbital parameters of *** particular,a combination of reverberation mapping with spectroastrometry(realized at the Very Large Telescope Interferometer)will further reinforce this *** Atacama Large Millimeter/submillimeter Array(ALMA)and the forthcoming Square Kilometre Array(SKA)are suggested to reveal dynamics of circumbinary disks through molecular emission lines.

关键词： galaxies:active quasars:supermassive black holes gravitational waves

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An Overview of Metal-Organic Frameworks for Green Chemical Engineering

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Engineering 2021年第8期7卷 1115-1139页

作者： Xiang-Jing Kong jian-rong Li Beijing Key Laboratory for Green Catalysis and Separation&Department of Environmental Chemical Engineering Beijing University of TechnologyBeijing 100124China

Given the current global energy and environmental issues resulting from the fast pace of industrialization,the discovery of new functional materials has become increasingly imperative in order to advance science and technology and address the associated *** boom in metal–organic frameworks(MOFs)and MOF-derived materials in recent years has stimulated profound interest in exploring their structures and *** preparation,characterization,and processing of MOF materials are the basis of their full engagement in industrial *** intensive research in these topics,it is time to promote the practical utilization of MOFs on an industrial scale,such as for green chemical engineering,by taking advantage of their superior *** famous MOFs have already demonstrated superiority over traditional materials in solving real-world *** review starts with the basic concept of MOF chemistry and ends with a discussion of the industrial production and exploitation of MOFs in several *** goal is to provide a general scope of application to inspire MOF researchers to convert their focus on academic research to one on practical *** the obstacles of cost,scale-up preparation,processability,and stability have been overcome,MOFs and MOF-based devices will gradually enter the factory,become a part of our daily lives,and help to create a future based on green production and green living.

关键词： Metal-organic frameworks(MOFs) Application Green chemical engineering

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