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Simulations of vertical jet penetration using a filtered two-fluid model in a gas-solid fluidized bed

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Particuology 2017年第2期15卷 95-104页

作者： Shuyan Wang Baoli Shao Xiangyu Li Jian Zhao Lili liu yikun liu gang liu Qun Dong School of Petroleum Engineering Northeast Petroleum University Daqing 163318 China

The influence of a vertical jet located at the distributor in a cylindrical fluidized bed on the flow behavior of gas and particles was predicted using a filtered two-fluid model proposed by Sundaresan and coworkers. The distributions of volume fraction and the velocity of particles along the lateral direction were investigated for different jet velocities by analyzing the simulated results. The vertical jet penetration lengths at the different gas jet velocities have been obtained and compared with predictions derived from empirical correlations; the predicted air jet penetration length is discussed. Agreement between the numerical simulations and experimental results has been achieved.

关键词： Fluidized bed Vertical jet penetration Filtered model Computational fluid dynamics Numerical simulation

Exploiting the point spread function for optical imaging through a scattering medium based on deconvolution method

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Journal of Innovative Optical Health Sciences 2019年第4期12卷 21-31页

作者： Hexiang He Xiangsheng Xie yikun liu Haowen Liang Jianying Zhou School of Physics and Optoelectronic Engineering Foshan University Foshan 528000 P.R.China Department of Physics College of Science Shantou University Shantou 515063P.R.China School of Physics Sun Yat-sen University Guangzhou 510275 P.R.China

Visual perception of humans penetrating turbid medium is hampered by *** techniques have been prompted recently to recover optical imaging through turbid *** them,speckle correlation based on deconvolution is one of the most attractive methods taking advantage of high imaging quality,robustness,eas-of-use,and *** exploiting the point spread function(PSF)of the scattering system,large Field-of-View,extended Depth-of-Field,noninvasiveness and spectral resoluation are now available as successful solutions for high quality and multifunctional image *** this paper,we review the progress of imaging through a scattering medium based on deconvolution method,including the principle,the breakthrough of the limitation of the optical memory ffect,the improvement of the deconvolution algorithm and innovative applications.

关键词： Speckle correlation deconvolution scattering medium imaging through turbid media

A benzenesulfonic acid-modified organic polymer monolithic column with reversed-phase/hydrophilic bifunctional selectivity for capillary electrochromatography

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Journal of Pharmaceutical Analysis 2023年第2期13卷 209-215页

作者： yikun liu Ning He Yingfang Lu Weiqiang Li Xin He Zhentao Li Zilin Chen Department of Orthopedics Trauma and Microsurgery Zhongnan Hospital of Wuhan UniversitySchool of Pharmaceutical SciencesWuhan UniversityWuhan430072China Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of EducationHubei Province Engineering and Technology Research Center for Fluorinated PharmaceuticalsWuhan430071China

Here,a styrene-based polymer monolithic column poly(VBS-co-TAT-co-AHM)with reversed-phase/hydrophilic interaction liquid chromatography(RPLC/HILIC)bifunctional separation mode was success-fully prepared for capillary electrochromatography by the in situ polymerization of sodium p-styrene sulfonate(VBS)with cross-linkers 3-(acryloyloxy)-2-hydroxypropyl methacrylate(AHM)and 1,3,5-triacryloylhexahydro-1,3,5-triazine(TAT).The preparation conditions of the monolith were *** morphology and formation of the poly(VBS-co-TAT-co-AHM)monolith were confirmed by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FT-IR).The separation perfor-mances of the monolith were evaluated *** should be noted that the incorporation of VBS functional monomer can provideπ-πinteractions,hydrophilic interactions,and ion-exchange ***,the prepared poly(VBS-co-TAT-co-AHM)monolith can achieve efficient separation of thiourea compounds,benzene series,phenol compounds,aniline compounds and sulfonamides in RPLC or HILIC separation *** largest theoretical plate number for N,N0-dimethylthiourea reached 1.7×10^(5)plates/*** addition,the poly(VBS-co-TAT-co-AHM)monolithic column showed excellent reproducibility and *** novel monolithic column has great application value and potential in capillary electrochromatography(CEC).

关键词： Sodium p-styrene sulfona Stationary phase Monolithic column Capillary electrochromatography Bifunctional interaction

Experimental study on surface-active polymer flooding for enhanced oil recovery: A case study of Daqing placanticline oilfield, NE China

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Petroleum Exploration and Development 2019年第6期46卷 1206-1217页

作者： YU Qiannan liu yikun LIANG Shuang TAN Shuai SUN Zhi YU Yang College of Mechanical and Electrical Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China School of Petroleum Engineering Northeast Petroleum UniversityDaqing 163318China School of Chemical Engineering Sichuan UniversityChengdu 610065China PetroChina Daqing Oil Field Co.Ltd. Daqing 163002China

Experiments on surface-active polymer flooding for enhanced oil recovery were carried out by detection analysis and modern physical simulation technique based on reservoirs and fluids in Daqing placanticline *** experimental results show that the surface-active polymer is different from other common polymers and polymer-surfactant systems in molecular aggregation,viscosity and flow capacity,and it has larger molecular coil size,higher viscosity and viscosifying capacity,and poorer *** surface-active polymer solution has good performance of viscosity-increasing and viscosity retention,and has good performance of viscoelasticity and deformability to exert positive effects of viscosifying and viscoelastic ***-active polymer can change the chemical property of interface and reduce interfacial tension,making the reservoir rock turn water-wet,also it can emulsify the oil into relatively stable oil-in-water emulsion,and emulsification capacity is an important property to enhance oil washing efficiency under non-ultralow interfacial *** surface-active polymer flooding enlarges swept volume in two ways:Microscopically,the surface-active polymer has mobility control effect and can enter oil-bearing pores not swept by water to drive residual oil,and its mobility control effect has more contribution than oil washing capacity in enhancing oil ***,it has plugging capacity,and can emulsify and plug the dominant channels in layers with high permeability,forcing the injected fluid to enter the layer with medium or low permeability and low flow resistance,and thus enlarging swept volume.

关键词： high water-cut oilfield reservoir surface-active polymer oil-washing efficiency swept volume plug by emulsification enhanced oil recovery

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Cis-regulatory element-based genome-wide identification of DREB1/CBF targets in Arabidopsis

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Progress in Natural Science:Materials International 2008年第5期18卷 579-583页

作者： Huan Zhao a, Weizhong liu a,b, Yong Hu a, Xianglin liu a, yikun He a, a College of Life Science, Capital Normal University, Beijing 100037, China b College of Life Sciences, Shanxi Normal University, Linfen 041004, China College of Life Science Capital Normal University Beijing 100037 China College of Life Sciences Shanxi Normal University Linfen 041004 China

Microarray analysis is used to identify transcriptional targets. However, the direct targets of transcription factors cannot be distin- guished from indirect ones; further, genes with low-expression levels cannot be identi ed by this method. In the present study, we exploit the cis-element dehydration-responsive element (DRE) that is known to be responsible for the transcription of DRE binding factor 1 (DREB1) targets in the promoter region of all Arabidopsis genes. Putative targets whose promoters contain the elements were veri ed by both microarray and reverse transcription-polymerase chain reaction (RT-PCR) analysis. Five new DREB1/CBF direct targets were identi ed. Compared with traditional microarray analysis, our method is convenient and cost-e ective for identifying the downstream targets of transcription factors.

关键词： Arabidopsis Cis-element Transcription factor DREB1/CBF Stress

Non-linear seepage model of hydraulic fracturing assisted oil displacement coupled with effects of high-pressure reduced adsorption: A case study of low and medium permeability reservoirs in Daqing Oilfield, NE China

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Petroleum Exploration and Development 2024年第6期51卷 1564-1573页

作者： WANG Fengjiao XU He liu yikun MENG Xianghao liu Lyuchaofan Key Laboratory of Enhanced Oil Recovery Ministry of Education Northeast Petroleum University Postdoctoral Res Ctr Daqing Oilfield Company Limited Sanya Offshore Oil and Gas Research Institute Northeast Petroleum University

Considering the adsorption loss of the hydraulic fracturing assisted oil displacement(HFAD) agent in the matrix, a method is proposed to characterize the dynamic saturation adsorption capacity of the HFAD agent with pressure differential and permeability. Coupled with the viscosity-concentration relationship of the HFAD agent, a non-linear seepage model of HFAD was established, taking into account the adsorption effect of high pressure drops, and the influencing factors were analyzed. The findings indicate that the replenishment of formation energy associated with HFAD technology is predominantly influenced by matrix permeability, fracture length and the initial concentration of the HFAD agent. The effect of replenishment of formation energy is positively correlated with matrix permeability and fracture length, and negatively correlated with the initial concentration of the HFAD agent. The initial concentration and injection amount of the high-pressure HFAD agent can enhance the concentration of the HFAD agent in the matrix and improve the efficiency of oil washing. However, a longer fracture is not conducive to maintaining the high concentration of the HFAD agent in the matrix. Furthermore, the fracture length and pump displacement are the direct factors affecting the fluid flow velocity in the matrix subsequent to HFAD. These factors can be utilized to control the location of the displacement phase front, and thus affect the swept area of HFAD. A reasonable selection of the aforementioned parameters can effectively supplement the formation energy, expand the swept volume of the HFAD agent, improve the recovery efficiency of HFAD, and reduce the development cost.

关键词： hydraulic fracturing assisted oil displacement adsorption loss dynamic saturation adsorption non-linear seepage enhanced oil recovery

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城市再生水厂启动及运行调试研究

给水排水 2020年第S1期46卷 441-444页

作者：刘屹坤北京城市排水集团有限责任公司北京100044

以北京某再生水厂的启动及运行调试为背景,针对污泥接种阶段、污水试运行阶段进行了简要的分析。再生水厂于2013年12月投入建设,先期完成日处理能力20万m3构筑物的建设,经过单体调试、系统清水联动后,于2016年3月进行污泥接种工作。经... 详细信息

以北京某再生水厂的启动及运行调试为背景,针对污泥接种阶段、污水试运行阶段进行了简要的分析。再生水厂于2013年12月投入建设,先期完成日处理能力20万m3构筑物的建设,经过单体调试、系统清水联动后,于2016年3月进行污泥接种工作。经过多方研究,最终确定采用"污水井接种启动,接种后污水连续运行"的方式,即将纯剩余污泥泥饼通过污水井卸入系统,并直接与污水混合的方式进行污泥接种,系统启动后直接进入污水试运行阶段。此种接种方式,起到了快速、高效的运行效果。接种调试期间,生物系统水温较低(低于18℃),日处理水量时变化系数较大,与此同时,上游来水逐月增加,但该再生水厂工艺运行一直比较稳定,出水达标排放,取得了良好的环境效益和社会效益。在实际调试运行过程中也出现了一些问题,经分析研究得到了解决,加快了系统的调试速度,这些经验可能对其他再生水厂的运行起到一定的参考作用。主要以生物系统启动过程中,接种污泥量计算、实际操作、污泥培养过程以及调试运行阶段的污泥浓度变化的影响因素进行了简要分析。

关键词：再生水厂污泥接种调试运行

Genome of Staphylococcus xylosus and Comparison with *** and ***

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Journal of Genetics and Genomics 2014年第7期41卷 413-416页

作者： Xiaojuan Tan Lin liu Shili liu Dongting Yang yikun liu Shuang Yang Aiqun Jia Nan Qin School of Environmental and Biological Engineering Nanjing University of Science and Technology State Key Laboratory for Diagnosis and Treatment of Infectious Disease The First Affiliated HospitalZhejiang University NGS Sequencing Department Beijing Genomics Institute (BGI) Institute of Pathogen Microbiology School of MedicineShandong University

Staphylococci are Gram-positive, AT-rich cocci, and often stick together in grape-like clusters. The genus can be classified into two groups based on their ability to produce coagulase, an enzyme that causes clotting of blood plasma （Otto, 2004）. Coagulase-positive Staphylococci include Staphylococcus aureus, a common pathogen of community-acquired and nosocomial infections （Smith et al., 2009）.

关键词： In NJ

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公众对文物保护与修复的认知模式探析

文博 2021年第3期 61-67,13页

作者：刘逸堃北京大学考古文博学院北京100871

文物保护与修复逐步进入公众的视野,但文物工作者与公众之间尚存在着诸多隔阂。本文通过对公众进行问卷调查,利用定量统计对调查结果进行分析,探究了公众对文物的主观认同以及对保护修复理念的客观认知,并通过构建“文物认同度”和“文... 详细信息

文物保护与修复逐步进入公众的视野,但文物工作者与公众之间尚存在着诸多隔阂。本文通过对公众进行问卷调查,利用定量统计对调查结果进行分析,探究了公众对文物的主观认同以及对保护修复理念的客观认知,并通过构建“文物认同度”和“文物修复倾向”两个维度的概念来对公众的认知情况进行分类描述,为文物价值的创新利用以及文物保护与修复的公众教育提供理论支持。

关键词：文物保护与修复公众教育问卷调查统计