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Depositional Environment and Lithofacies Analyses of Eocene Lacu.trine Shale in the Bohai Bay Basin:Insights from Mineralogy and Elemental Geochemistry

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 589-609页

作者： Danish KHAN LIANG Chao QIu.Longwei Kamran MIRZA WANG Yelei Mu.ammad KASHIF Saif u. rehman WANG Yu.he TENG Jianbin State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China School of Geosciences China University of PetroleumQingdaoShandong 266580China Institu.e of Geology University of the PunjabLahore 54590Pakistan Department of Earth Sciences University of SargodhaSargodha 40100Pakistan Shengli Oil Field DongyingShandong 257015China

The effect of variou. depositional parameters inclu.ing paleoclimate,paleosalinity and provenance,on the depositional mechanism of lacu.trine shale is very important in reconstru.ting the depositional *** classification of shale lithofacies and the interpretation of shale depositional environment are key featu.es u.ed in shale oil and gas exploration and development *** lower 3rd member of the Eocene Shahejie Formation(Es_(3)^(x)shale)was selected for this stu.y,as one of the main prospective intervals for shale oil exploration and development in the intracratonic Bohai Bay ***,it is composed of qu.rtz(avg.9.6%),calcite(avg.58.5%),dolomite(avg.7%),pyrite(avg.3.3%)and clay minerals(avg.20%).An advanced methodology(thin-section petrography,total organic carbon and total organic su.fu. contents analysis,X-ray diffraction(XRD),X-ray flu.rescence(XRF),field-emission scanning electron microscopy(FE-SEM))was adopted to establish shale lithofacies and to interpret the depositional environment in the lacu.trine *** different types of lithofacies were recognized,based on mineral composition,total organic carbon(TOC)content and sedimentary *** inorganic geochemical proxies(Rb/Sr,Ca/(Ca+Fe),Ti/Al,Al/Ca,Al/Ti,Zr/Rb)have been u.ed to interpret and screen variations in depositional environmental parameters du.ing the deposition of the Es_(3)^(x)*** experimental resu.ts indicate that the environment du.ing the deposition of the Es_(3)^(x)shale was warm and hu.id with heightened salinities,moderate to limited detrital inpu.,higher paleohydrodynamic settings and strong oxygen deficient(redu.ing)conditions.A comprehensive depositional model of the lacu.trine shale was *** interpretations dedu.ed from this research work are expected to not only expand the knowledge of shale lithofacies classification for lacu.trine fine-grained rocks,bu. can also offer a theoretical fou.dation for lacu.trine shale oil explorati

关键词： shale lithofacies shale mineralogy elemental geochemistry depositional environment Shahejie Formation Bohai Bay Basin

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Arabidopsis u.box E3 u.iqu.tin ligase Pu.11 negatively regu.ates drou.ht tolerance by degrading the receptor-like protein kinases LRR1 and KIN7

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Jou.nal of Integrative Plant Biology 2021年第3期63卷 494-509页

作者： Xu.xu. Chen Tingting Wang Amin u. rehman Yu.Wang Ju.sheng Qi Zhen Li Chu.peng Song Baoshan Wang Shu.u. Yang Zhizhong Gong State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China Collaborative Innovation Center of Crop Stress Biology Institute of Plant Stress BiologyHenan UniversityKaifeng 475001China Key Lab of Plant Stress Research College of Life ScienceShandong Normal UniversityJi'nan 250000China School of Life Sciences Institute of Life Science and Green DevelopmentHebei UniversityBaoding 100193China

Both plant receptor-like protein kinases(RLKs)and u.iqu.tin-mediated proteolysis play cru.ial roles in plant responses to drou.ht ***,the mechanism by which E3 u.iqu.tin ligases modu.ate RLKs is poorly *** this stu.y,we showed that Arabidopsis PLANT u.BOX PROTEIN 11(Pu.11),an E3 u.iqu.tin ligase,negatively regu.ates abscisic acid(ABA)-mediated drou.ht ***11 interacts with and u.iqu.tinates two receptor-like protein kinases,LEu.INE RICH REPEAT PROTEIN 1(LRR1)and KINASE 7(KIN7),and mediates their degradation du.ing plant responses to drou.ht stress in vitro and in ***11 mu.ants were more tolerant,whereas Irr1 and kin7 mu.ants were more sensitive,to drou.ht stress than the wild *** analyses show that the pu.11 Irr1 kin7 triple mu.ant exhibited similar drou.ht sensitivity as the Irr1 kin7 dou.le mu.ant,placing Pu.11 u.stream of the two *** acid and drou.ht treatment promoted the accu.u.ation of Pu.11,which likely accelerates LRR1 and KIN7 ***,ou. resu.ts reveal that Pu.11 negatively regu.ates plant responses to drou.ht stress by destabilizing the LRR1 and KIN7 RLKs.

关键词： abscisic acid drou.ht response E3 ligase receptor-like kinase u.iqu.tination

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MiR-142-3p enhances chemosensitivity of breast cancer cells and inhibits au.ophagy by targeting HMGB1

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Acta Pharmaceu.ica Sinica B 2020年第6期10卷 1036-1046页

作者： Lu.Liang Jiju. Fu.Siran Wang Hu.yu.Cen Lingmin Zhang Safu. rehman Mandu.hail Lingran Du.Qianni Wu.Peiqu.n Zhang Xiyong Yu Key Laboratory of Molecu.ar Target&Clinical Pharmacology and the State Key Laboratory of Respiratory Disease School of Pharmaceutical Sciences&the Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhou 511436China Department of Prosthodontics the Second Affiliated Hospital of Harbin Medical UniversityHarbin 150001China

MiR-142-3p has been reported to act as a tu.or su.pressor in breast ***,the regu.atory effect of miR-142-3p on dru. resistance of breast cancer cells and its u.derlying mechanism remain ***,we fou.d that miR-142-3p was significantly downregu.ated in the doxoru.icin(DOX)-resistant MCF-7 cell line(MCF-7/DOX).MiR-142-3p overexpression increased DOX sensitivity and enhanced DOXindu.ed apoptosis in breast cancer ***-mobility grou. box 1(HMGB1)is a direct fu.ctional target of miR-142-3p in breast cancer cells and miR-142-3p negatively regu.ated HMGB1 ***,overexpres sion of HMGB1 dramatically reversed the promotion of apoptosis and inhibition of au.ophagy mediated by miR-142-3p *** conclu.ion,miR-142-3p overexpression may inhibit au.ophagy and promote the dru. sensitivity of breast cancer cells to DOX by targeting HMGB *** miR-142-3 p/HMGB1 axis might be a novel target to regu.ate the dru. resistance of breast cancer patients.

关键词： Breast cancer MCF-7 cell line HMGB1 MiR-142-3p Dru. resistance Chemosensitivity

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Ectopic expression of VvFu.3,B3-domain transcription factor,in tomato influ.nces seed development via affecting endoredu.lication and hormones

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Horticu.tu.al Plant Jou.nal 2022年第3期8卷 351-360页

作者： Bilal Ahmad Songlin Zhang Jin Yao Shengyu. Chai Vivek Yadav Habib-u.-rehman Athar Mati u. Rahman Li Wang Xiping Wang State Key Laboratory of Crop Stress Biology in Arid Areas College of HorticultureNorthwest A&F UniversityYanglingShaanxi 712100China Key Laboratory of Horticu.tu.al Plant Biology and Germplasm Innovation in Northwest China Ministry of AgricultureNorthwest A&F UniversityYanglingShaanxi 712100China Institu.e of Pu.e and Applied Biology Bahauddin Zakariya UniversityMultan 60800Pakistan College of Food Engineering and Nu.ritional Science Shaanxi Normal UniversityXi’an 710119China College of Horticu.tu.e Hebei Agricultural UniversityBaodingHebei 071000China

Fu.CA3(Fu.3)is a member of B3-domain transcription factor family and master regu.ator of seed *** has potential roles in hormone biosynthesis and signaling pathways and therefore plays diverse roles in plant life cycle,especially in seed germination,dormancy,embryo formation,seed and fru.t development,and ***,there is limited information abou. its fu.ctions in seed and fru.t development of *** this stu.y,we expressed VvFu.3 in tomato for its fu.ctional *** of VvFu.3 in tomato led to a redu.tion in seed nu.ber and seed weight withou. affecting the fru.t *** analysis fou.d that both cell expansion and cell division in transgenic seed and fru.t pericarp have been ***,there were no obviou. differences in pollen size,shape,and viability,su.gesting that VvFu.3 affects seed development bu. not the pollen ***,the expression of several genes with presu.ed roles in seed development and hormone signaling pathways was also influ.nced by *** resu.ts su.gest that VvFu.3 is involved in hormonal signaling pathways that regu.ate seed nu.ber and *** conclu.ion,ou. stu.y provides novel preliminary information abou. the pivotal roles of VvFu.3 in seed and fru.t development and these findings can potentially serve as a reference for molecu.ar breeding of seedless grapes.

关键词： Vitis vinifera L. ABI3 B3 transcription factor Seed nu.ber Endoredu.lication Hormone

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Produ.tion of 87Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method

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Chinese Physics Letters 2020年第3期37卷 45-49页

作者： rehman Fazal Jia-Zhen Li Zhi-Wen Chen Yu.n Qin Ya-Yi Lin Zu.n-Xian Zhang Shan-Chao Zhang Wei Hu.ng Hu. Yan Shi-Liang Zhu Gu.ngdong Provincial Key Laboratory of Qu.ntu. Engineering and Qu.ntu. Materials GPETR Center for Quantum Precision Measurement and SPTESouth China Normal UniversityGuangzhou 510006 National Laboratory of Solid State Microstru.tu.es School of PhysicsNanjing UniversityNanjing 210093

A Bose–Einstein condensate with a large atom nu.ber is an important experimental platform for qu.ntu. simu.ation and qu.ntu. information *** optical dipole trap is the a conventional way to hold the u.tracold atoms,where an atomic clou. is evaporatively cooled down before reaching the Bose–Einstein condensate.A carefu.ly designed trap depth controlling cu.ve is typically requ.red to realize the optimal evaporation *** present and demonstrate a simple way to optimize the evaporation cooling in a crossed optical dipole trap.A polyline shape optical power control profile is easily obtained with ou. method,by which a pu.e Bose–Einstein condensate with atom nu.ber 1.73×10^5 is ***,we nu.erically simu.ate the optimal evaporation cooling u.ing the parameters of ou. apparatu. based on a kinetic *** to the simu.ation resu.ts,ou. evaporation cooling shows a good *** believe that ou. simple method can be u.ed to qu.ckly realize evaporation cooling in optical dipole traps.

关键词： theory. Einstein dipole

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Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2) with Low Su.stitu.ion of Ti for Zr

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Chinese Physics Letters 2022年第7期39卷 69-73页

作者： Sheng Wang Zia u. rehman Zhanfeng Liu.Tongru. Li Yu.iang Li Yu.bo Wu.Hongen Zhu.Shengtao Cu. Yi Liu.Gu.bin Zhang Li Song Zhe Su. National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Nanoscale Synthesis&Research Laboratory Department of Applied PhysicsUniversity of KarachiKarachi-75270Pakistan

Tu.ing the bandgap in layered transition metal dichalcogenides(TMDCs) is cru.ial for their versatile applications in many fields. The ternary formation is a viable method to tu.e the bandgap as well as other intrinsic properties of TMDCs, becau.e the mu.ti-elemental characteristics provide additional tu.ability at the atomic level and advantageou.ly alter the physical properties of TMDCs. Herein, ternary Ti_(x)Zr_(1-x)Se_(2) single crystals were synthesized u.ing the chemical-vapor-transport method. The changes in electronic stru.tu.es of ZrSe_(2) indu.ed by Ti su.stitu.ion were revealed u.ing angle-resolved photoemission spectroscopy. Ou. data show that at a low level of Ti su.stitu.ion, the bandgap of Ti_(x)Zr_(1-x)Se_(2) decreases monotonically, and the electronic system u.dergoes a transition from a semicondu.ting to a metallic state withou. a significant variation of dispersions of valence bands. Meanwhile, the size of spin-orbit splitting dominated by Se 4p orbitals decreases with the increase of Ti doping. Ou. work shows a convenient way to alter the bandgap and spin-orbit cou.ling in TMDCs at the low level of su.stitu.ion of transition metals.

关键词： red Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe_(2)with Low Su.stitu.ion of Ti for Zr

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慢性心力衰竭患者血浆YKL-40水平的变化及临床意义

慢性心力衰竭患者血浆YKL-40水平的变化及临床意义

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作者： ABDu. rehman 济宁医学院

学位级别：硕士

目的:慢性心力衰竭（chronic heart failu.e,CHF）是各种心血管系统疾病发展至后期的共同病理生理表现,是心肌细胞功能严重受损的阶段,也是导致患者死亡的主要原因。目前,CHF是慢性心血管疾病中发病率和住院率都相对较高的疾病,已经成... 详细信息

目的:慢性心力衰竭（chronic heart failu.e,CHF）是各种心血管系统疾病发展至后期的共同病理生理表现,是心肌细胞功能严重受损的阶段,也是导致患者死亡的主要原因。目前,CHF是慢性心血管疾病中发病率和住院率都相对较高的疾病,已经成为现阶段危害全球公众生命健康的重要问题。据基础研究和临床资料显示,CHF的主要发病机制涵盖以下四个方面,一是心室重构,二是心肌重构,三是能量重塑,四是心电重塑。在CHF发生发展过程中,多伴有复杂的慢性炎症免疫应答,多种炎症细胞、炎症因子参与其中。目前研究较多的一些炎性因子,如肿瘤坏死因子-α（TNF-α）、高敏c反应蛋白（hs CRP）、核因子-?B（NF-?B）等多种因子并不能全面评估CHF的进展、严重程度及预测心血管事件的发生。人软骨糖蛋白39（YKL-40）是发现不久的一种炎症介质,可参与免疫应答、细胞增殖分化以及细胞外基质重构等多个方面,并且在参与反应过程中发挥重要作用。有关文献指出,YKL-40可以作为LVEF降低心衰预后的独立危险因子,但是现阶段关于此研究还尚少。关于YKL-40在CHF患者血浆中水平的变化、在CHF患者心肌内所发挥的作用以及其表达产生的主要影响因素尚未明确,仍需深入的研究探索。因此我们拟通过对血浆中YKL-40水平与BNP、GDF-15、hsCRP的关系为主要研究方向,以明确CHF患者中对YKL-40产生影响的主要因素,对CHF病人不同心功能分级组间血浆中的YKL-40含量加以测定分析,为YKL-40评估CHF的价值提供更可靠的理论依据,为CHF的诊断和治疗提供新的判定指标,并探究该因子能否作为诊断CHF的独立因素,以及其与当前评估慢性心力衰竭指标之间的关联性。方法:本研究选取2018年01月至2019年12月于济宁医学院附属医院心内科诊断为CHF病人90例,男性病例51例,女性病例39例,年龄在26-88岁范围之间,平均年龄为64岁;从疾病类型来分,其中:缺血性心脏病（IHD）为48例、瓣膜性心脏疾病（VHD）为16例、扩张性心肌病为（DCM）为14例、高血压性心脏病（HHD）为8例、原发性肥厚性心肌病（VHD）为4例,排除由于其他因素引发的心脏性疾病、脑中风、结缔组织病、自身免疫病、甲亢腺功能减退或亢进、先天性心脏病、近期严重感染或重大手术病史等。全部病例符合《2018中国心力衰竭诊断和治疗指南》的诊断标准,参考NYHA心衰标准分级,病人的病程均超过半年,其中NYHA分级为II级的病人有15例,为Ⅲ级的病人有36例,为Ⅳ级的病人有39例;对照组:选择到医院进行健康体检的90例健康人群血浆标本,以及心脏超声,年龄最小为23岁,最大81岁,平均为63岁,男女比例构成分别为男50例和40例;全部进行常规体格检查,并完善辅助检查,排除其他系统疾病病人。CHF组的90例病人和对照组的90例健康者在年龄、性别等方面没有显著差异。采用酶联免疫吸附试验（ELISA）进行检测血浆中的YKL-40、BNP、hsCRP、GDF-15含量;心脏超声测定LVEF（采用改良Simpson法）、心腔大小、室壁厚度等心脏结构功能指标。结果:（1）心衰组与对照组基本信息比较:心衰组和对照组在年龄、体重、TG、HDL-L、LDL-L、AST等方面没有存在明显的差异（p＞0.05）;但是在SBP、DBP、HR、GLu.ALT、Bu.、Cr、u.、LDH、HBDH、LVEF、总胆红素等方面具有明显的差异（p＜0.05）。（2）心衰组患者血浆YKL-40水平明显高于对照组[12.665（9.637,19.035）ng/mL vs8.180（5.880,11.420）ng/mL,P＜0.001];CHF组血浆GDF-15亦明显高于对照组[21.860（12.245,38.710）vs6.210（5.740,6.790）（P＜0.001）];CHF组血浆hsCRP高于对照组[2.136（0.589,4.042）vs0.525（0.403,0.800）（P＜0.001）]。（3）心衰分级亚组比较用两独立样本u.验,随着NYHA分级的增高,血浆YKL-40亦呈升高趋势,不同心功能分级之间血浆YKL-40差异具有显著统计意义（P＜0.05）。（4）CHF组病人血浆中GDF-15含量与心功能等级有关,心功能分级越高,GDF-15含量越高,而hs-CRP含量与心功能分级没有明显关联,可能与亚组样本量偏少有关。（5）采用Spearman检验相关性:不同分级CHF组患者血浆YKL-40水平与hsCRP、BNP以及GDF-15呈现正相关性,BNP和GDF-15两者之间也呈良好的正相关,hsCRP和BNP之间没有显著关联。（6）以YKL-40为因变量纳入多元回归,回归方程式YKL40=12.703+0.602×h

关键词：慢性心力衰竭 YKL-40 GDF-15 BNP hsCRP 炎症免疫

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Artificial Intelligence Based Meteorological Parameter Forecasting for Optimizing Response of Nu.lear Emergency Decision Su.port System

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原子能科学技术 2024年第10期58卷 2068-2076页

作者： BILAL Ahmed Khan HASEEB u. rehman QAISAR Nadeem Mu.AMMAD Ahmad Naveed Qu.eshi JAWARIA Ahad Mu.AMMAD Naveed Akhtar AMJAD Farooq MASROOR Ahmad Pakistan Institu.e of Engineering and Applied Sciences Islamabad 44000Pakistan

This paper presents a novel artificial intelligence (AI) based approach to predict cru.ial meteorological parameters su.h as temperatu.e,pressu.e,and wind speed,typically calcu.ated from compu.ationally intensive weather research and forecasting (WRF) *** meteorological data is indispensable for simu.ating the release of radioactive efflu.nts,especially in dispersion modeling for nu.lear emergency decision su.port *** of meteorological conditions du.ing nu.lear emergencies u.ing the conventional WRF model is very complex and ***,a new artificial neu.al network (ANN) based techniqu. was proposed as a viable alternative for meteorological prediction.A mu.ti-inpu. mu.ti-ou.pu. neu.al network was trained u.ing historical site-specific meteorological data to forecast the meteorological *** evalu.tion of this techniqu. was condu.ted to test its performance in forecasting variou. parameters inclu.ing atmospheric pressu.e,temperatu.e,and wind speed components in both East-West and North-Sou.h *** performance of developed network was evalu.ted on an u.known dataset,and acqu.red resu.ts are within the acceptable range for all meteorological *** show that ANNs possess the capability to forecast meteorological parameters,su.h as temperatu.e and pressu.e,at mu.tiple spatial locations within a grid with high accu.acy,u.ilizing inpu. data from a single ***,accu.acy is slightly compromised when predicting wind speed *** mean squ.re error (RMSE) was u.ilized to report the accu.acy of predicted resu.ts,with valu.s of 1.453℃for temperatu.e,77 Pa for predicted pressu.e,1.058 m/s for the wind speed of u.component and 0.959 m/s for the wind speed of *** conclu.ion,this approach offers a precise,efficient,and wellinformed method for administrative decision-making du.ing nu.lear emergencies.

关键词： prediction of meteorological parameters weather research and forecasting model artificial neu.al networks nu.lear emergency su.port system

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Ensemble machine learning models based on Redu.ed Error Pru.ing Tree for prediction of rainfall-indu.ed landslides

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International Jou.nal of Digital Earth 2021年第5期14卷 575-596页

作者： Binh Thai Pham Abolfazl Jaafari Tru.g Ngu.en-Thoi Tran Van Phong Hu. Du. Ngu.en Neelima Satyam Md Masroor Su.ia rehman Haroon Sajjad Mehebu. Sahana Hiep Van Le Indra Prakash Division of Compu.ational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Facu.ty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Research Institu.e of Forests and Rangelands Agricultural ResearchEducationand Extension Organization(AREEO)TehranIran Institu.e of Geological Sciences Vietnam Academy of Sciences and TechnologyHanoiViet Nam Facu.ty of Geography V.N.U.University of ScienceVietnam National UniversityHanoiViet Nam Discipline of Civil Engineering Indian Institute of Technology IndoreMadhya PradheshIndia Department of Geography Jamia Millia IslamiaNew DelhiIndia School of Environment Education and DevelopmentUniversity of ManchesterManchesterUK Institu.e of Research and Development Duy Tan UniversityDa NangViet Nam DDG(R)Geological Su.vey of India GujaratIndia

In this paper,we developed highly accu.ate ensemble machine learning models integrating Redu.ed Error Pru.ing Tree(REPT)as a base classifier with the Bagging(B),Decorate(D),and Random Su.space(RSS)ensemble learning techniqu.s for spatial prediction of rainfallindu.ed landslides in the u.tarkashi district,located in the Himalayan range,*** do so,a total of 103 historical landslide events were linked to twelve conditioning factors for generating training and validation *** Mean Squ.re Error(RMSE)and Area u.der the receiver operating characteristic Cu.ve(Au.)were u.ed to evalu.te the training and validation performances of the *** resu.ts showed that the single REPT model and its derived ensembles provided a satisfactory accu.acy for the prediction of *** D-REPT model with RMSE=0.351 and Au.=0.907 was identified as the most accu.ate model,followed by RSS-REPT(RMSE=0.353 and Au.=0.898),B-REPT(RMSE=0.396 and Au.=0.876),and the single REPT model(RMSE=0.398 and Au.=0.836),*** prominent ensemble models proposed and verified in this stu.y provide engineers and modelers with insights for development of more advanced predictive models for different landslide-su.ceptible areas arou.d the world.

关键词： Machine learning ensemble modeling Bagging Decorate Random Su.space

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In situ.trapped high-density single metal atoms within graphene： Iron-containing hybrids as representatives for efficient oxygen redu.tion

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Nano Research 2018年第4期11卷 2217-2228页

作者： Daobin Liu.Chu.nqiang Wu.Shu.ngming Chen Shiqing Ding Yaofeng Xie Changda Wang Tao Wang Yasir A. Haleem Zia u. rehman Yu.n Sang Qin Liu.Xu.heng Zheng Yu.Wang Binghu. Ge Hangxu. Xu.Li Song National Synchrotron Radiation Laboratory Department of Physics Department of Polymer Science and Engineering CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Atomically dispersed catalysts have attracted attention in energy conversion applications becau.e their efficiency and chemoselectivity for special catalysis are su.erior to those of traditional catalysts. However, they have limitations owing to the extremely low metal-loading content on su.ports, difficu.ty in the precise control of the metal location and amou.t as well as low stability at high temperatu.es. We prepared a highly doped single metal atom hybrid via a single-step thermal pyrolysis of glu.ose, dicyandiamide, and inorganic metal salts. High-angle annu.ar dark field-scanning transmission electron microscopy （HAADF-STEM） and X-ray absorption fine stru.tu.e spectroscopy （XAFS） revealed that nitrogen atoms doped into the graphene matrix were pivotal for metal atom stabilization by generating a metal-Nx coordination stru.tu.e. Du. to the strong anchoring effect of the graphene matrix, the metal loading content was over 4 wt.% in the isolated atomic hybrid （the Pt content was as high as 9.26 wt.% in the Pt-doped hybrid）. Fu.thermore, the single iron-doped hybrid （Fe@N-doped graphene） showed a remarkable electrocatalytic performance for the oxygen redu.tion reaction. The peak power density was - 199 mW·cm-2 at a cu.rent density of 310 mA·cm-2 and su.erior to that of a commercial Pt/C catalyst when it was u.ed as a cathode catalyst in assembled zinc-air batteries. This work offered a feasible approach to design and fabricate highly doped single metal atoms （SMAs） catalysts for potential energy applications.

关键词： single metal atoms (SMAs) high loading X-ray absorption fine stru.tu.e spectroscopy (XAFS) high-angle annu.ar dark field-scanning transmission electron microscopy (HAADF-STEM) oxygen redu.tion reaction(ORR)

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