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Sequence stratigraphic analysis of superimposed coal measure gas-bearing system in daning-Jixian block,eastern margin of Ordos Basin,China

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Frontiers of Earth Science 2024年第3期18卷 611-622页

作者： Shizhuang YANG Song LI Wenguang tian Guanghao zhong Junjian WANG School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Klohn Crippen Berger Ltd. BrisbaneQueensland 4101Australia

The identification of superimposed gas-bearing systems in coal measures is the basis for expediting the optimization of coal measure gas *** the analysis of drill cores and log data of Upper Carboniferous Benxi Formation to the member 8 of Middle Permian Lower Shihezi Formation in daning-Jixian block,eastern margin of Ordos Basin,four distinct superimposed coal measure gas-bearing systems were identified,and their formation mechanism was discussed from the sequence stratigraphic *** Ⅰ system mainly contains multiple coal seams,shales and sandstone *** Ⅱ system is dominated by multiple coal seams and *** Ⅲ is characterized by multiple sandstone layers,and type Ⅳ system is dominated by limestones and *** general,the gas-bearing systems deposited in barrier-lagoon are type Ⅱ,those deposited in carbonate tidal flats are type IV,and those deposited in the delta front are types Ⅰ and Ⅲ.The marine mudstone,acting as a key layer near the maximum flooding surface,exhibits very low permeability,which is the main factor contributing to the formation of superimposed gas-bearing *** sedimentary environment plays a significant role in controlling the distribution of gas-bearing ***,the vertical gas-bearing systems in the south-western region,where delta front and lagoon facies overlap,are more complex than those in the north-eastern delta front facies.

关键词： coal measure gas superimposed gas-bearing system sequence stratigraphic key layer

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Rapid determination of leaf water content for monitoring waterlogging in winter wheat based on hyperspectral parameters

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Journal of Integrative Agriculture 2021年第10期20卷 2613-2626页

作者： YANG Fei-fei LIU Tao WANG Qi-yuan DU Ming-zhu YANG tian-le LIU da-zhong LI Shi-juan LIU Sheng-ping Key Laboratory of Agri-information Service Technology Ministry of Agriculture and Rural Affairs/Agricultural Information InstituteChinese Academy of Agricultural SciencesBeijing 100081P.R.China Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Agricultural College Yangzhou UniversityYangzhou 225009P.R.China College of Geoscience and Surveying Engineering China University of Mining&TechnologyBeijing 100083P.R.China

Waterlogging is becoming an obvious constraint on food production due to the frequent occurrence of extremely high-level rainfall *** water content(LWC)is an important waterlogging indicator,and hyperspectral remote sensing provides a non-destructive,real-time and reliable method to determine ***,based on a pot experiment,winter wheat was subjected to different gradients of waterlogging stress at the jointing *** hyperspectral data and LWC were collected every 7 days after waterlogging treatment until the winter wheat was *** with methods such as vegetation index construction,correlation analysis,regression analysis,BP neural network(BPNN),etc.,we found that the effect of waterlogging stress on LWC had the characteristics of hysteresis and all waterlogging stress led to the decrease of *** decreased faster under severe stress than under slight stress,but the effect of long-term slight stress was greater than that of short-term severe *** sensitive spectral bands of LWC were located in the visible(VIS,400–780 nm)and short-wave infrared(SWIR,1400–2500 nm)*** BPNN Model with the original spectrum at 648 nm,the first derivative spectrum at 500 nm,the red edge position(λr),the new vegetation index RVI(437,466),NDVI(437,466)and NDVI´(747,1956)as independent variables was the best model for inverting the LWC of waterlogging in winter wheat(modeling set:R^(2)=0.889,RMSE=0.138;validation set:R^(2)=0.891,RMSE=0.518).These results have important theoretical significance and practical application value for the precise control of waterlogging stress.

关键词： winter wheat hyperspectral remote sensing leaf water content new vegetation index BP neural network

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Molecular Framework for Auxin-Controlled Hlomeostasis-of Shoot Stem Cells in Arabidopsis

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Molecular Plant 2018年第7期11卷 899-913页

作者： Linjie Luo Jian Zengg Haijun Wu Zhaoxia tian zhong Zhao CAS Center for Excellence in Molecular Plant Sciences School of Life Sciences University of Science and Technology of China Huangshan Road 443Hefei 230027 China

The classic phytohormone auxin plays an essential role in priming meristematic cell differentiation in the shoot apical meristem to promote lateral organ initiation. Recently, several lines of evidence have suggested that auxin is not only transported to new primordia but also descends to the stem cells in the central zone. However, the function of auxin in stem cell regulation has remained elusive. Here, we show that auxin signaling in stem cells is mediated, at least in part, byAUXIN RESPONSE FACTOR 5/MONOPTEROS （ARF5/MP）, which directly represses the transcription of DORNROSCHEN /ENHANCER OF SHO0 T REGENERA TION 1 （DRN/ESR 1）. DRN expressed in stem cells positively regulates CLAVATA3 （CLV3） expression and has important meristematic functions. Our results provide a mechanistic framework for auxin control of shoot stem cell homeostasis and demonstrate how auxin differentially controls plant stem cell maintenance and differentiation.

关键词： stem cell homeostasis auxin MONOPTEROS DORNROSCHEN

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“Slope-adsorption & plateau-pore filling” mechanism unlocking the potential of hard carbon anodes for “fast-charging & large-sized”batteries

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Science China Materials 2025年第1期 309-311页

作者： tian Liang Xiaoming Zhu Hubei Key Laboratory of Radiation Chemistry and Functional Materials School of Nuclear Technology and Chemistry & Biology Hubei University of Science and Technology

To date, there has been no report on fast-charging and Ahlevel sodium-ion batteries (SIBs) by utilizing thick hard carbon anodes that demonstrate prolonged cycling life and high areal capacity at high rates. Further, the relationship among the complex structure of hard carbon, storage mechanism, and fastcharging performance in alkali-metal ion batteries has been a subject of ongoing debate [1,2].

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Tribocatalysis: challenges and perspectives

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Science China Chemistry 2021年第10期64卷 1609-1613页

作者： Feng-Ru Fan Shunji Xie Guan-Wu Wang zhong-Qun tian State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Center of Chemistry far Energy Materials(iChEM)Department of ChemistryUniversity of Science and Technology'of ChinaHefei 230026China

With an increasing global energy demands and environmental pollution, the development of alternative clean energy technologies has aroused widespread research *** and converting natural energy from the environment, such as solar energy, mechanical energy, thermal energy, chemical and biological energy, is one of the main sources of clean energy.

关键词： catalysis pollution energy

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Spatially-separated and photo-enhanced semiconductor corrosion processes for high-efficient and contamination-free electrochemical nanoimprint lithography

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Science China Chemistry 2022年第4期65卷 810-820页

作者： Hantao Xu Lianhuan Han Jian-Jia Su zhong-Qun tian Dongping Zhan Key Laboratory of Physical Chemistry of Solid Surfaces(PCOSS) Engineering Research Center of Electrochemical Technologies of Ministry of EducationDepartment of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Mechanical and Electrical Engineering School of Aerospace EngineeringXiamen UniversityXiamen 361005China

Free of any thermoplastic or photocuring resists, electrochemical nanoimprint lithography(ECNL) has emerged as an alternative nanoimprint way to fabricate three-dimensional micro/nano-structures(3D-MNSs) directly on a semiconductor wafer by a spatially-confined corrosion reaction induced by the metal/semiconductor contact potential. However, the consumption of electron acceptors in the ultrathin electrolyte between imprint mold and semiconductor wafer will slow down or even cease the corrosion rate. To solve this problem, we change the short-circuited corrosion cell into a spatially-separated primary cell: the imprint mold compacted gallium arsenide(GaAs) wafer in the anodic chamber while the platinum(Pt) plate connected to the imprint mold in the cathodic chamber. Thus, the GaAs corrosion rate will be stabilized in its limiting steady-state current density because of the abundant source of electron acceptors in the catholic chamber. The corrosion processes can be photo-enhanced by white-light illumination. Consequently, both the accuracy and the efficiency are promoted dramatically, which are demonstrated by the excellent performance of the fabricated binary optical elements. Moreover, the contamination problem caused by the electron acceptors is totally avoided. All the results prove that this novel ECNL mode is competitive and prospective in imprinting 3D-MNSs directly on semiconductor wafer.

关键词： nanoimprint lithography electrochemical microfabrication semiconductor corrosion semiconductor microdevices 3D functional micro/nano-structures

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萘普生的微生物转化

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沈阳药科大学学报 2002年第5期19卷 369-372页

作者：刘磊孙璐黄海华杨田英钟大放沈阳药科大学制药工程学院辽宁沈阳110016 沈阳药科大学药物代谢与药物动力学实验室辽宁沈阳110016 大连美罗大药房连锁有限公司辽宁大连116013

目的研究微生物对萘普生的转化能力。方法以雅致小克银汉霉菌AS 3 1 5 6为转化菌株 ,并对转化条件进行优化 ,利用液相色谱质谱联用法检测转化液中萘普生的代谢产物。结果根据液相色谱和质谱数据推测 ,主要转化产物为O 去甲基萘普生。... 详细信息

目的研究微生物对萘普生的转化能力。方法以雅致小克银汉霉菌AS 3 1 5 6为转化菌株 ,并对转化条件进行优化 ,利用液相色谱质谱联用法检测转化液中萘普生的代谢产物。结果根据液相色谱和质谱数据推测 ,主要转化产物为O 去甲基萘普生。对影响O 去甲基萘普生形成因素的考察发现 ,以pH 6 0 ,底物浓度 0 0 2 5 % ,转化反应持续 72h等条件较为适宜 ,其产率大于 95 %。结论雅致小克银汉霉菌AS 3 1 5 6能够高度专一性地对萘普生进行O 去甲基转化反应 ,可以作为药物代谢研究新的体外模型。

关键词：萘普生微生物转化雅致小克银汉霉菌去甲基化液相色谱-质谱分析

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Aluminum and phosphorus codoped “superaerophobic” Co3O4 microspheres for highly efficient electrochemical water splitting and Zn-air batteries

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Journal of Energy Chemistry 2020年第11期29卷 324-331页

作者： Xian-Wei Lv Yuping Liu Wenwen tian Lijiao Gao zhong-Yong Yuan National Institute for Advanced Materials School of Materials Science and EngineeringNankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Multifunctional non-precious catalysts for hydrogen/oxygen evolution reaction(HER/OER) and oxygen reduction reaction(ORR) constitute the bottleneck in the applications in electrochemical overall water splitting(OWS) and Zn-air batteries. Herein, a trifunctional electrocatalyst of urchin-like Al,P-codoped Co3O4 microspheres supported on Ni foam(denoted as AP-CONPs/NF) was fabricated via a hydrothermal process and subsequent low-temperature annealing and phosphorization, exhibiting enhanced OER, HER and ORR activities compared with single-doped and undoped samples. Their surface self-organized microstructure and excellent "superaerophobic" feature make a high bubble repellency, which boost diffusion of reactants and electrolyte-electrode intimate contact. The codoping of Al and P elements into Co3O4 betters right the balance among surface chemical state, the increased oxygen vacancies and the promoted charge transfer. Encouraged by these synergistic advantages, the AP-CONPs/NF was further employed as excellent bifunctional electrodes for the OWS(low cell voltage of 1.57 V at 10 mA cm-2) and as air cathode for rechargeable Zn-air batteries(high power density of 89.1 mW cm-2), which demonstrates a great feasibility for practical applications.

关键词： Trifunctional electrocatalysts Co3O4 Overall water splitting Zn-air batteries "Superaerophobic"surface Anion-cation double doping

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Role of Hydrodynamic Interactions in the Deformation of Star Polymers in Poiseuille Flow

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Chinese Journal of Polymer Science 2020年第4期38卷 363-370,I0006页

作者： Zhen-Yue Yang Xiao-Fei tian Li-Jun Liu Ji-zhong Chen State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China

Stretching polymer in fluid flow is a vital process for studying and utilizing the physical properties of these molecules,such as DNA linearization in nanofluidic *** studied the role of hydrodynamic interactions(His)in stretching a free star polymer in Poiseuille flow through a tube using mesoscale hydrodynamic *** increasing the flow strength,star polymers migrate toward the centerline of tube due to His,whereas toward the tube wall in the absence of *** analyzing the end monomer distribution and the perturbed flow around the star polymer,we found that the polymer acts like a shield against the flow,leading to additional hydrodynamic drag forces that compress the arm chains in the front of the star center toward the tube axis and lift the arm chai ns at the back toward the tube *** balanced hydrodynamic forces freeze the polymer into a trumpet structure,where the arm chains maintain a steady strongly stretched state at high flow *** contrast,the polymer displays remarkably large conformational change when switching off *** simulation results explained the coupling between His and the structure of star polymers in Poiseuille flow.

关键词： Hydrodynamic interactions Star polymer Poiseuille flow Migration

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Information freshness optimization of multiple status update streams in Internet of things:Generation rate control and service rate reservation

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Digital Communications and Networks 2023年第4期9卷 971-980页

作者： tianci Zhang Junjie Zhou Zhengchuan Chen zhong tian Wanli Wen Yunjian Jia School of Microelectronics and Communication Engineering Chongqing UniversityChongqing400044China National Mobile Communications Research Laboratory Southeast UniversityNanjingChina

The Internet of things(IoT)has become a key infrastructure providing up-to-date and fresh information for policy analysis and decision-making of upper-layer ***,there are limited sensing and communication resources in IoT devices,which significantly affects the timeliness and freshness of the updated *** work proposes two schemes,namely,the generation rate control and service rate reservation schemes,to improve the overall information freshness of multiple status update streams at the ***,using the recently proposed Age of Information(AoI)as the metric for evaluating information freshness,we characterized the overall information freshness,i.e.,the overall average AoI at the receiver for both schemes,by considering the urgency difference of status update and *** schemes for status updates and streams,respectively,were formulated as two optimization *** proved that both problems are convex and the optimal generation and service rates for different streams are found by the standard convex optimization ***,we proposed both approximate optimal generation and approximate optimal service rate for fast deployment in heavy and light load *** results verify the theoretical findings and accuracy of the proposed approximate solutions,guiding the design and deployment of IoT.

关键词： Internet of things Information freshness Age of information Multi-source M/M/1 queuing model

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