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Reversible adhesion surface coating proppant

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Chinese Chemical Letters 2021年第1期32卷 553-556页

作者： Quan Xu fan fan Zhaohui lu Mao Sheng Shouceng Tian Ye Zhang Linhua Pan yang Zhou State Key Laboratory of Petroleum Resources and Prospecting Beijing Key Laboratory of Biogas Upgrading UtilizationHarvard SEAS-CUPB Joint Laboratory on Petroleum ScienceChina University of Petroleum(Beijing)Beijing 102249China National Joint Engineering Research Center for Shale Gas Exploration and Development Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China

Proppant is a key material in the hydraulic fracturing process,which has been widely used in unconventional oil *** proppants are easy to sedimentate and accumulate at the entrance of shale fracture,which will block the diversion of water,oil and *** proppants(CPs) are fabricated by coating resin on normal ceramic proppants through a simple method,which is dramatically enhanced the supporting properties in shale fracture and easy to scale *** with uncoated ceramic proppants,the self-suspension ability of CPs is ~11 times higher,which are able to migrate and distribute farther and deeper inside the *** the same time,Coating enhanced the 23.7% of adhesive force in maximum,which makes the CPs easier to adhere on the fracture surface to supportthe shale ***,the liquid conductivity of CPs is 60% higher than uncoated ceramic proppants at13.6 MPa *** method is expected to fabricated varieties of proppantsfor shale fracture supporting to improve the exploration of unconventional oil and gas resources.

关键词： Self-suspension Coating Proppants Hydraulic fracturing process Liquid conductivity

What are the practical limits for the specific surface area and capacitance of bulk sp^2 carbon materials?

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Science China Chemistry 2016年第2期59卷 225-230页

作者： Yanhong lu Guankui Long Long Zhang Tengfei Zhang Mingtao Zhang fan Zhang yang yang Yanfeng Ma Yongsheng Chen School of Chemistry & Material Science Langfang Teachers University Key Laboratory of Functional Polymer Materials and Center for Nanoscale Science and Technology Institute of Polymer Chemistry College of Chemistry Nankai University

The possible practical limits for the specific surface area and capacitance performance of bulk sp^2 carbon materials were investigated experimentally and theoretically using a variety of carbon materials. We find the limit for the specific surface area to be 3500–3700 m^2 g^(-1), and based on this, the corresponding best capacitance was predicted for various electrolyte systems. A model using an effective ionic diameter for the electrolyte ions was proposed and used to calculate the theoretical capacitance. A linear dependence of experimental capacitance versus effective specific surface area of various sp^2 carbon materials was obtained for all studied ionic liquid, organic and aqueous electrolyte systems. Furthermore, excellent agreement between the theoretical and experimental capacitance was observed for all the tested sp^2 carbon materials in these electrolyte systems, indicating that this model can be applied widely in the evaluation of various carbon materials for supercapacitors.

关键词： graphene bulk sp2 carbon materials supercapacitor specific surface area DFT modeling

Inversion analysis of the shear strength parameters for a high loess slope in the limit state

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Journal of Mountain Science 2021年第1期18卷 252-264页

作者： LIN Xiao-yan ZHANG Lin-fan yang Ze LI Ping LI Tong-lu School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065China Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou UniversityXi'an 710065China School of Geological Engineering and Surveying Chang'an UniversityXi'an 710061China

It is difficult to obtain reliable shear strength parameters for the stability analysis and evaluation of high loess ***,this paper determines slope elements and physical parameter of 79 slopes with heights of[40,120]m based on the measured loess slopes in the Ganquan and Tonghuang subregions of northern Shaanxi Province,*** the limit state of the loess slope(stability factor Fs is 1.0),a fitting equation for the slope height and width is ***,the model is developed by stability analysis software-SLOPE/W,and the comprehensive shear strength parameters corresponding to different slope heights of the high slope in the study area are obtained by inversion using the Morgenstern-Price *** results show that when the height of the slope increases,the cohesion c increases in the soil,and the internal friction angle j *** change is consistent with the characteristics reflected in the composition and physical properties of the slopes,and the comprehensive strength parametric curves are very similar between the Ganquan subregion and the Tonghuang subregion.A landslide that occurred in Miaodian-zaitou of Jingyang County,Shaanxi Province,is selected to verify this inversion method,and the results show that the calculated shear strength parameters of the inversion are consistent with the measured value of the actual slope.

关键词： Loess High slope Shear strength Inversion SLOPE/W

The Ikaros family of zinc-finger proteins

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Acta Pharmaceutica Sinica B 2016年第6期6卷 513-521页

作者： Yingzhi fan Duo lu State Key Laboratory of Bioactive Substances and Function of Natural Medicine Institute of Materia MedicaChinese Academy of Medical Sciences

Ikaros represents a zinc-finger protein family important for lymphocyte development and certain other physiological processes. The number of family members is large, with alternative splicing producing various additional isoforms from each of the five homologous genes in the family. The functional forms of Ikaros proteins could be even more diverse due to protein–protein interactions readily established between family members. Emerging evidence suggests that targeting Ikaros proteins is feasible and effective in therapeutic applications, although the exact roles of Ikaros proteins remain elusive within the intricate regulatory networks in which they are involved. In this review we collect existing knowledge as to the functions, regulatory pathways, and molecular mechanisms of this family of proteins in an attempt to gain a better understanding through the comparison of activities and interactions among family members.

关键词： Ikaros family Zinc-finger Lymphocyte development Drug target Transcription factor

Density wave and topological superconductivity in the magic-angle-twisted bilayer-graphene

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Chinese Physics B 2020年第12期29卷 24-32页

作者： Ming Zhang Yu Zhang Chen lu Wei-Qiang Chen fan yang School of Physics Beijing Institute of TechnologyBeijing 100081China Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China

The model dependence in the study of the magic-angle twisted bilayer-graphene(MA-TBG)is an important issue in the research *** has been argued previously that the two-band tight-binding(TB)model(per spin and valley)cannot serve as a start point for succeeding studies as it cannot correctly describe the topological aspect of the continuumtheory model near the Dirac nodes in the mini Brillouin zone(MBZ).For this purpose,we adopt the faithful TB model[***.B 99195455(2019)]with five bands(per spin and valley)as our start point,which is further equipped with extended Hubbard *** after systematic random-phase-approximation(RPA)based calculations,we study the electron instabilities of this model,including the density wave(DW)and superconductivity(SC),near the van Hove singularity(VHS).Our results are as *** the case neglecting the tiny inter-valley exchange interaction,the exact SU(2)K×SU(2)K symmetry leads to the degeneracy between the inter-valley charge DW(CDW)and the spin DW(SDW)(which would be mixed then),and that between the singlet d+id-wave and triplet p+ip-wave topological *** a realistic tiny inter-valley exchange interaction is turned on with nonzero coefficient(J_H=0),the SDW or CDW is favored respectively at the critical point,determined by JH→0-or JH→0+.In the mean time,the degeneracy between the singlet d+id-wave and triplet p+ip-wave topological SCs is also lifted up by the tiny *** results are highly similar to the results of our previous study[arXiv:2003.09513]adopting the two-band TB model,with the reason lying in that both models share the same symmetry and Fermi-surface(FS)nesting character near the *** a similarity suggests that the low-energy physics of the doped MA-TBG is mainly determined by the symmetry and the shape of the FS of the doped system,and is insensitive to other details of the band structure,including the topological aspects near the Dirac nodes in the MBZ.

关键词： magic-angle twisted bilayer-graphene(MA-TBG) van Hove singularity(VHS) density wave(DW) pairing symmetries

Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

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Journal of Materials Science & Technology 2024年第10期177卷 181-190页

作者： Junru Yao Jintang Zhou lu lu Feng yang Zhengjun Yao Bo Ouyang Erjun Kan Yuxin Zuo Renchao Che fan Wu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Ministry of Industry and Information Technology Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics)Nanjing 211100China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of ScienceNanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Magnetic metal absorbers exhibit remarkable microwave absorption ***,their practical application is severely limited due to their susceptibility to corrosion,particularly in marine *** address this challenge,we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum(La).This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine *** this study,we employ a La_(2)O_(3) modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe_(2)O_(4) on the surface,leveraging the pinning effect of in situ generated La_(2)O_(3) .This process enhances the interface polarization of the absorbers,thereby improving their electromagnetic performance and ma-rine corrosion ***,the La_(2)O_(3) modified FeCo@rGO composites exhibit broadband ab-sorption,covering a wide frequency range of 6.11 GHz at 1.55 ***,the electromagnetic proper-ties of the La_(2)O_(3) modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCI solution,simulating marine conditions,for at least 15 ***,we perform first-principle calculations on FeCo and FeCo-O to validate the corrosion resistance of the La_(2)O_(3) modified FeCo@rGO composites at the atomic *** comprehensive investigation explores the control of rare earth lan-thanum modification on the size of magnetic metal particles,enabling efficient electromagnetic wave absorption and marine corrosion *** results of this study provide a novel and facile strategy for the control of microwave absorbers,offering promising prospects for future research and development in this field.

关键词： Rare earth lanthanum FeCo@rGO Microwave absorption Marine corrosion resistance

Hydrological characteristics and changes in the Nu-Salween River basin revealed with model-based reconstructed data

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Journal of Mountain Science 2021年第11期18卷 2982-3002页

作者： yang fan lu Hui yang Kun HUANG Guang-wei LI Yi-shan WANG Wei lu Ping TIAN Fu-qiang HUANG Yu-gang Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Ministry of Education Ecological Field Station for East Asian Migratory Birds Beijing 100084China Center for Excellence in Tibetan Plateau Earth Sciences and National Tibetan Plateau Data Center Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Graduate School of Global Environmental Studies Sophia UniversityTokyo 102-8554Japan Changjiang Institute of Survey PlanningDesign and ResearchWuhan 430010China Department of Hydraulic Engineering State Key Laboratory of Hydroscience and EngineeringTsinghua UniversityBeijing 100084China The International Economic&Technical Cooperation and Exchange Center Ministry of Water ResourcesBeijing 100053China

The Nu-Salween River(NSR),the longest free-flow river in Southeast Asia,plays an irreplaceable role in social development and ecological *** lower NSR region is particularly valuable as it is inhabited by approximately 6.7 million *** basin has limited hydraulic conservancy infrastructure and insufficient ability to cope with climate change *** the hydrological characteristics and changes in the basin provides the scientific basis for rational protection and development of the ***,owing to the limitation of observation data,previous studies have focused on the local area and neglected the study of the lower reaches,which is not enough to reflect the spatial characteristics of the entire *** this study,the ECMWF 5th generation reanalysis data(ERA5)and Multi-Source Weighted-Ensemble Precipitation(MSWEP)were applied to develop a geomorphology-based hydrological model(GBHM)for reconstructing hydrological datasets(***-ERA5 and GBHM-MSWEP).The reconstructed datasets covering the complete basin were verified against the gauge observation and compared with other commonly used streamflow products,including Global Flood Awareness System v2.1,GloFAS-Reanalysis dataset v3.0,and linear optimal runoff aggregate(LORA).The comparison results revealed that GBHM-ERA5 is significantly better than the other four datasets and provides a good reproduction of the hydrological characteristics and trends of the *** analysis of GBHM-ERA5 revealed that:(1)A multi-year mean surface runoff represented 39%of precipitation over the basin during 1980–2018,which had low surface runoff in the upstream,while areas around the Three Parallel Rivers Area and the estuary had abundant surface runoff.(2)The surface runoff and discharge coefficient of variations in spring were larger than those in other seasons,and the inter-annual variation in the downstream was smaller than that in the upstream and midstream regions.(3)More than 70%of the basin are

关键词： Nu-Salween River Distributed hydrologic model ERA5 Surface runoff Discharge Climate Change

A Phytophthora capsici RXLR Effector Targets and Inhibits a Plant,PPlase to Suppress Endoplasmic Reticulum-Mediated Immunity

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Molecular Plant 2018年第8期11卷 1067-1083页

作者： Guangjin fan yang yang Tingting Li Wenqin lu Yu DU Xiaoyu Qiang Qujiang Wen Weixing Shan State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection Northwest A&F University Yangling Shaanxi 712100 China State Key Laboratory of Crop Stress Biology for Add Areas and College of Agronomy Northwest A&F University Yangling Shaanxi 712100 China State Key Laboratory of Crop Stress Biology for Arid Areas and College of Horticulture Northwest A&F University Yangling Shaanxi 712100 China

Phytophthora pathogens secrete a large arsenal of effectors that manipulate host processes to create an environment conducive to pathogen colonization. However, the underlying mechanisms by which Phytophthora effectors manipulate host plant cells still remain largely unclear. In this study, we report that PcAvr3a12, a Phytophthera capsici RXLR effector and a member of the Avr3a effector family, suppresses plant immunity by targeting and inhibiting host plant peptidyl-prolyl cis-trans isomerase （PPlase）. Overexpression of PcAvr3a 12 in Arabidopsis thaliana enhanced plant susceptibility to P. capsici. FKBP15-2, an endoplasmic reticulum （ER）-Iocalized protein, was identified as a host target of PcAvr3a12 during early P. capsici infection. Analyses of A. thaliana T-DNA insertion mutant （fkbp15-2）, RNAi, and overexpression lines consistently showed that FKBP15-2 positively regulates plant immunity in response to Phytophthora infection. FKBP15-2 possesses PPlase activity essential for its contribution to immunity but is directly suppressed by PcAvr3a12. Interestingly, we found that FKBP15-2 is involved in ER stress sensing and is required for ER stress-mediated plant immunity. Taken together, these results suggest that P. capsici deploys an RXLR effector, PcAvr3a12, to facilitate infection by targeting and suppressing a novel ER-Iocalized PPlase, FKBP15-2, which is required for ER stress-mediated plant immunity.

关键词： RXLR effector Avr3a FKBP ER stress immunity Phytophthora capsici

Dental pulp regeneration strategies:A review of status quo and recent advances

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Bioactive Materials 2024年第8期38卷 258-275页

作者： Xin-lu Li Wei fan Bing fan The State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of EducationHubei Key Laboratory of StomatologySchool&Hospital of StomatologyWuhan University237 Luoyu Road430079WuhanChina

Microorganisms,physical factors such as temperature or mechanical injury,and chemical factors such as free monomers from composite resin are the main causes of dental pulp *** clinical treatment methods for pulp diseases include the root canal therapy,vital pulp therapy and regenerative endodontic *** endodontic therapy serves the purpose of inducing the regeneration of new functional pulp tissues through autologous revascularization or pulp tissue *** article first discusses the current clinical methods and reviews strategies as well as the research outcomes regarding the pulp *** the in vivo models,the prospects and challenges for regenerative endodontic therapy were further discussed.

关键词： Pulp regeneration Revascularization Scaffold Growth factor Cell-homing