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Concise extraction and characterization of the pore-throat network in unconventional hydrocarbon reservoirs: A new perspective

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Petroleum Science 2024年第3期21卷 1474-1487页

作者： Shu-Heng Du Yong-min shi State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China School of Earth and Space Sciences Peking UniversityBeijing100871China

In this study,a new image-based method for the extraction and characterization of pore-throat network for unconventional hydrocarbon storage and exploitation is proposed.“Pore-throat solidity”,which is analogous to particle solidity,and a new method for automatic identification of pores and throats in tight sandstone oil reservoirs are ***,the“pore-throat combination”and“pure pore”are defined and distinguished by drawing the cumulative probability curve of the pore-throat solidity and by selecting an appropriate cutoff *** the discrete grid set is recognized as a pore-throat combination,Legendre ellipse fitting and minimum Feret diameter are *** the pore and throat grid sets are identified as pure pores,the pore diameter can be directly *** the new method,the analytical results for the physical parameters and pore radius agree well with most prior *** results comparing the maximum ball and the new model could also prove the accuracy of the latter's in micro and nano *** new model provides a more practical theoretical basis and a new calculation method for the rapid and accurate evaluation of the complex processes of oil migration.

关键词： Hydrocarbon exploitation Pore Throat Porous media Identification

中性粒细胞淋巴细胞比率和补体C3与系统性红斑狼疮活动度的相关性

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中国卫生检验杂志 2017年第18期27卷 2673-2676页

作者：陈素云赵志新吴春龙沈益敏陈世勇温州医科大学附属台州医院检验科浙江台州317000 温州医科大学附属台州医院神经外科浙江台州317000

目的探讨中性粒细胞淋巴细胞比率(NLR)、补体C3与系统性红斑狼疮(SLE)活动度的关系。方法收集113例住院SLE患者为SLE组,另收集120例健康体检者为对照组,分析2组检测结果差异,并运用t检验、Spearman相关分析、多元线性回归分析实验室指标... 详细信息

目的探讨中性粒细胞淋巴细胞比率(NLR)、补体C3与系统性红斑狼疮(SLE)活动度的关系。方法收集113例住院SLE患者为SLE组,另收集120例健康体检者为对照组,分析2组检测结果差异,并运用t检验、Spearman相关分析、多元线性回归分析实验室指标与SLE疾病活动度的关系。结果 SLE患者NLR水平、血沉(ESR)、红细胞分布宽度(RDW)与对照组相比水平升高。SLE活动期患者较静止期患者NLR升高而C3水平降低,差异有统计学意义(P<0.05)。用Spearman相关性分析法分析SLE患者NLR与SLEDAI(r=0.200,P<0.05)、ESR(r=0.182,P<0.01)、CRP(r=0.279,P<0.01)呈正相关;C3与SLEDAI呈负相关(r=-0.292,P<0.01),与C4(r=0.774,P<0.01)呈正相关。多元线性回归分析RDW、NLR、ESR、CRP、C3、C4与SLEDAI评分之间的关系,NLR和C3与SLEDAI评分呈独立相关(P=0.022,P<0.01)。结论 NLR与C3可以用来评价系统性红斑狼疮的疾病活动度。

关键词：中性粒细胞淋巴细胞比率 C3 系统性红斑狼疮活动度

Teleportation of an Arbitrary Two-Atom Entangled State via Thermal Cavity

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Communications in Theoretical Physics 2007年第3期47卷 437-440页

作者： WANG Dong LIU yi-min GAO Gan shi Shou-Hua ZHANG Zhan-Jun Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of ministry of Education of China School of Physics ＆ Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics the Chinese Academy ofSciences Wuhan 430071 China 不详

We present an experimentally feasible scheme for teleportation of an arbitrary unknown two-atom entangled state by using two-atom Bell states in driven thermal cavities. In this scheme, the effects of thermal field an... 详细信息

关键词： teleportation entangled state thermal cavity

Luminescent Properties of Mercury-taining Diethynylfluorene Derivatives

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Chemical Research in Chinese Universities 2007年第1期23卷 92-95页

作者： LIAO yi shi Li-li FENG Ji-kang YANG Li REN Ai-min State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry The College of Chemistry Jilin University Changchun 130021 P. R. China Institute of Functional Material Chemistry Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

Excited state structures and spectroscopic properties of mercury（ 11 ） complexes, Hg-TFT（1） and its electronwithdrawing substituents Hg-TFOT （ 2 ）, Hg-TFCNT （ 3 ）, where TFT = dietbynylfluorenyl, TFOT = diethynylfluorenone, and TFCNT = diethynyl-[9-（dicyanomethylene） fluorene], were studied using singlet excitation configuration interaction（CIS） and time-dependent density functional theory（TDDFT） methods. The results of the theoretical calculations indicate that the electron-withdrawing substitutions lead to a significant decrease in the energy gap between the ground state and the first excited states. In the case of Hg-TFCNT, the second singlet excited state （S2 ） may contribute to the luminescence because of its large S1-S2 separation.

关键词： TD-DFT CIS Luminescence

Covalent organic frameworks catalyzed by organic Lewis acid

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Science China Chemistry 2022年第7期65卷 1315-1320页

作者： Xiangqian shi Lezhi yi Hexiang Deng College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Hubei Yangtze Memory Laboratories Wuhan 430205China Key Laboratory of Biomedical Polymers-ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China

We report the synthesis of covalent organic framework(COF)crystals with organic Lewis acid instead of the conventional use of Br?nsted acid or inorganic Lewis ***,tris(pentafluorophenyl)borane was applied for the growth of seven imine COFs:TAPB-PDA-,TAPB-2,5-DMTA-,TAPB-2,3-DMTA-,TAPT-PDA-,TAPT-2,5-DMTA-,TAPT-2,3-DMTA-COF with hcb topology and varied in functional groups,as well as a new one,COF-820,with sql *** these COFs were obtained at room *** high crystallinity and porosity demonstrate the versatility of the organic Lewis acid as a *** organic Lewis acid was found critical for the production of COF-820,while its absence resulted in the formation of a different COF,4PE-1P-COF,with kgm topology using the same building *** steric effect,typical for organic catalysts,provides a new way to regulate the topology of COFs and their future design.

关键词： covalent organic framework organic lewis acid tris(pentafluorophenyl)borane topology regulation

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Asymmetric Reactions Catalyzed by Chiral Tertiary Phosphines

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Chinese Journal of Chemistry 2020年第11期38卷 1395-1421页

作者： yin Wei min shi State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular SynthesisUniversity of Chinese Academy of SciencesShanghai Institute of Organic ChemistryChinese Academy of Sciences345 Ling ling RoadShanghai 200032China

Chiral tertiary phosphines are versatile Lewis base catalysts capable of promoting a wide range of asymmetric *** particular,the recent designed chiral phosphines based on the concept of bi-/multifunctionality have been demonstrated to be effective catalysts for many types of asymmetric reactions such as(aza)-MBH reaction/RC reaction,cycloaddition reaction,domino reaction,nucleophilic addition reaction,*** review summarizes the recent advances in this field and highlights the selected significant achievements.

关键词： Chiral asymmetric versatile

Scalping or Line-sitting:The Role of Speculators

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Journal of Systems Science and Systems Engineering 2022年第1期31卷 1-33页

作者： Qianqian Chen Zhenyang shi yi Yang School of Management Zhejiang UniversityHangzhou310058China

Speculative behaviors have burgeoned in various business settings whereby it is costly for consumers to purchase directly from *** paper examines the values of two typical speculative behaviors,scalping and line-sitting,against a backdrop of markets with *** establish a two-stage model in which a monopolist seller sells an item(product or service)to consumers in the first stage,and the item can be traded on a resale platform in the second *** have no interests in consumption but incur lower costs in pm-chasing and reselling processes than *** the scalping model,they buy the item first and resell it later to make *** the line-sitting model,they earn incomes by serving as surrogates of consumers in *** first find whether the two phenomena emerge critically depends on the value of consumers'entry *** main results indicate that both speculative behaviors can bring benefits to the seller and resale platform by a demand expansion effect,although through different *** scalping,the entry of speculators as additional buyers always boosts demand in both stages,and achieves a win-win outcome for the seller and platform,although less consumers remain in the market and the resale price *** line-sitting,demand is enlarged and profits rise in both stages,only when consumers find purchasing directly more time-and money-consuming,because they need to pay an extra service fee to ***,the consumer population gets better off from the two speculative behaviors when their entry cost is relatively *** both models emerge,scalping may be preferable to line-sitting for the seller,resale platform and consumers,if the cost advantage of speculators in resale transactions is more evident.

关键词： Speculative behavior scalping line-sitting strategic behavior entry cost

Unraveling structure and performance of protein a ligands at liquid–solid interfaces: A multi-techniques analysis

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Chinese Journal of Chemical Engineering 2023年第2期54卷 232-239页

作者： yi Shen Xinshuang Chu Qinghong shi Department of Biochemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(ministry of Education) Tianjin UniversityTianjin 300350China

Oriented ligand immobilization is one of the most effective strategies used in the design and construction of a high-capacity protein A chromatography. In this work, cysteine was introduced as anchoring sites by substituting a specific residue on Helix Ⅰ, Ⅱ, and at C-terminus of antibody binding domain Z from protein A, respectively, to investigate structural evolution and binding behavior of protein A ligands at liquid-solid interfaces. Among the three affinity dextran-coated Fe_(3)O_(4) magnetic nanoparticles(Fe_(3)O_(4)@Dx MNPs), affinity MNPs with the immobilized ligand via N11C on Helix Ⅰ(Fe_(3)O_(4)@Dx-Z_(1) MNPs) had the highest helical content, and MNPs with the immobilized ligand via G29C on Helix Ⅱ(Fe_(3)O_(4)@Dx-Z_(2) MNPs) had the lowest helical content at the same pHs. It was attributed to less electrostatic attraction of ligand to negatively charged surface on Fe_(3)O_(4)@Dx-Z_(1) MNPs because of less positive charged residues on Helix Ⅰ(K6) than Helix Ⅱ(R27/K35). Among the three affinity MNPs, moreover, the highest affinity to immunoglobulin G(IgG) binding was observed on Fe_(3)O_(4)@Dx-Z_(1) MNPs in isothermal titration calorimetry measurement, further validating greater structural integrity of the ligand on Fe_(3)O_(4)@Dx-Z_(1) MNPs. Finally,the study of IgG binding on MNPs and 96-well plates showed that anchoring sites for ligand immobilization had distinct influences on IgG binding and IgG-mediated antigen binding. This work illustrated that anchoring sites of the ligands had a striking significance for the molecular structure of the ligand at liquid-solid interfaces and raised an important implication for the design and optimization of protein A chromatography and protein A-based immunoassay analysis.

关键词： Adsorption Interface Thermodynamics Protein A ligand Immobilization Molecular structure

An improvement of Chen-Ru-Yan's degenerated second main theorem

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Science China Mathematics 2015年第12期58卷 2517-2530页

作者： shi Lei RU min Department of Mathematics East China Normal University Department of Mathematics University of Houston

We give an improvement for the second main theorem of algebraically non-degenerate holomorphic curves into a complex projective variety V intersecting hypersurfaces in subgeneral position, obtained by Chen et al.(2012... 详细信息

关键词： Nevanlinna theory holomorphic curve second main theorem truncation level