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Formation and evolution of supercritical geofluid

Science China Earth Sciences 2025年第1期68卷 39-51页

作者： Huaiwei NI Yilin XIAO Xiaolin XIONG Xiandong LIU Chunxiao gao Yi-Xiang CHEN Yunguo LI Wan-Cai LI Xuan GUO Yang-Yang WANG Dong-Bo TAN Li ZHANG State Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Sciences and Engineering Nanjing University State Key Lab of Superhard Materials Jilin University

In this work, we provide a comprehensive review on the formation, evolution, properties, and effects of supercritical geofluid. In Earth's interior, enhanced miscibility between H2O and silicate by the addition of special components or by the increase of pressure and temperature gives rise to supercritical geofluid with a significant amount of both H2O and silicate *** formation of supercritical geofluid in magmatic-hydrothermal systems, typified by pegmatite system, is governed by meltfluid critical curve. The formation of supercritical geofluid in metamorphic systems, typified by subducted slab, is governed by the second critical end point. Experimental results suggest that the presence of boron and fluorine in pegmatite system makes it possible to form supercritical geofluid at crustal depths, but the release of supercritical geofluid from subducted slab is withheld until almost 100 km depth. A major presence of both H2O and depolymerized structural units（monomers, dimers, etc.） endows supercritical geofluid with unique physical properties including low density, low elastic moduli, low viscosity, high diffusivity,and high electrical conductivity. Supercritical geofluid can effectively mobilize a variety of elements even including high field strength elements and heavy rare earth elements. The chemical signatures of supercritical geofluid can be inherited by metasomatized mantle and mantle-derived melts, and this could give an explanation of the oxidation of arc magmas. Phase separation of supercritical geofluid through the mechanism of spinodal decomposition leads to formation of a melt network. Multiphase fluid inclusions recovered from subduction zone rocks and pegmatites are possible relics of supercritical geofluid. Supercritical geofluid can cause electrical anomaly and low seismic velocity near the top of subducted slab, and can be linked with intermediate-focus earthquakes. Supercritical geofluid may have played a crucial role in the formation of pe

关键词： Supercritical geofluid Miscibility Subduction zone Pegmatite

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Insights into electrolyte effects on photoactivities of dye-sensitized photoelectrochemical cells for water splitting

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Journal of Energy Chemistry 2017年第3期26卷 476-480页

作者： Xin ding Linlin Zhang Yan gao State Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Centre on Molecular DevicesDalian University of Technology (DUT) School of Chemistry and Chemical Engineering Qingdao University

Dye-sensitized photoelectrochemical cell（DS-PEC） is an especially attractive method to generate hydrogen via visible light driven water splitting. Electrolyte, an essential component of DS-PEC, plays a great role in determining the photoactivities of devices for water splitting. When using phosphate buffer（pH = 6.4）as electrolyte, the DS-PEC displayed much higher photoactivity than using 0.1 M Na;SO;（pH = 6.4） as electrolyte. The insight is phosphate anion gathers together to form a negative electrostatic field on TiO;surface, which increases the resistance in the TiO;/catalyst and electrolyte interface and validly reduces the charge recombination from TiO;to the oxidized catalyst.

关键词： Water splitting Molecular device Photoanode Electrolyte DS-PEC

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An unprecedented high temperature event in southern China in autumn 2021 and the essential role of the mid-latitude trough

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Advances in Climate Change Research 2022年第6期13卷 772-777页

作者： Ting ding Xiang LI Hui gao Climate Studies Key Laboratory National Climate CenterChina Meteorological AdministrationBeijing 100081China

Studies about high temperatures in China rarely touched the period beyond *** in September-early October 2021,a record-breaking high temperature event occurred in southern China,and affected agriculture in many *** the daily maximum temperature and the number of high temperature days were the highest in September since *** better understand the different features and possible causes of the extreme event in autumn from those in summer,the analysis of atmospheric circulation patterns was *** western Pacific subtropical high(WPSH)was quite stronger and extended much more westward in most of the days in September 2021 than its climatology,which directly caused this unprecedented autumn high temperature ***,the mid-latitude trough over the east of Japan may also play an essential role in this high temperature *** to the southward extension of the trough,a cyclonic circulation anomaly appeared at 850 hPa,and its northerly wind component prevailed in the west of the trough and blocked the eastward retreat of the *** a result,southern China was stably controlled by the WPSH,which led to the persistence of this high temperature *** conclusion is further confirmed by the statistical results from the analysis of the multi-year data and analogue *** to the previous studies,this study reveals the essential role of the mid-latitude trough and highlights the joint impacts of the WPSH and the trough in causing the unprecedented autumn high temperature event.

关键词： Extreme high temperature Western Pacific subtropical high Mid-latitude trough Southern China

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Influences of the adsorption state of catalyst on the performance of DS-PEC for visible light driven water splitting

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Journal of Energy Chemistry 2017年第1期26卷 163-167页

作者： Linlin Zhang Yan gao Xin ding State Key Laboratory of Fine Chemicals Institute of Artificial Photosynthesis DUT-KTH Joint Education and Research Center on Molecular Devices Dalian University of Technology (DUT) School of Chemistry and Chemical Engineering Qingdao University Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province

Adsorption state of catalyst on photoanode is an important factor on influencing the performance of dye-sensitized photoelectrochemical cells (DS-PECs) for water splitting. Photoanode TiO2(1 + 2) was assembled with Ru(bpy)(3) phosphoric acid derivative (complex 1) as photosensitizer and complex 2 as water oxidation catalyst to compare with photoanode TiO2(1 + 3). The photocurrent density of photoanode TiO2(1 + 3) with catalyst 3 synthesized with only one end fixing on the surface of TiO2 is about four-fold of the photoanode assembled with catalyst 2 fixing with two claws on the surface of TiO2. The phenomenon should be caused by the littery arrangement and shorter distance of catalyst 2 from the active center of catalyst to TiO2 on the surface of semiconductor which led to lowly efficient electron transfer. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved

关键词： Water oxidation Photoelectrochemical Photoanode DS-PEC

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Solving quantified constraint satisfaction problems with value selection rules

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Frontiers of Computer Science 2020年第5期14卷 153-163页

作者： Jian gao Jinyan Wang Kuixian Wu rong Chen College of Information Science and Technology Dalian Maritime UniversityDalian116026China Logistics Research Institute Dalian Maritime UniversityDalian116026China College of Computer Science and Information Engineering Guangxi Normal UniversityGuilin541004China

Solving a quantified constraint satisfaction problem(QCSP)is usually a hard task due to its computational *** algorithms play an important role in solving this problem,among which backtrack algorithms are *** a backtrack algorithm,an important step is assigning a variable by a chosen value when exploiting a branch,and thus a good value selection rule may speed up *** this paper,we propose two value selection rules for existentially and universally quantified variables,respectively,to avoid unnecessary *** rule for universally quantified variables is prior to trying failure values in previous branches,and the rule for existentially quantified variables selects the promising values *** rules are integrated into the state-of-the-art QCSP solver,i.e.,QCSP-Solve,which is an exact solver based on *** perform a number of experiments to evaluate improvements brought by our *** computational results,we can conclude that the new value selection rules speed up the solver by 5 times on average and 30 times at *** also show both rules perform well particularly on instances with existentially and universally quantified variables occurring alternatively.

关键词： quantified CSP backtracking value selection fail-first principle

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Abrupt Flood–Drought Alternation in Southern China during Summer 2019

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Journal of Meteorological Research 2021年第6期35卷 998-1011页

作者： Yuan YUAN Hui gao Ting ding National Climate Center China Meteorological AdministrationBeijing 100081

We investigated the abrupt alternation from flood to drought in southern China during summer 2019 using multiple *** anomalies of precipitation occurred in southern China in the summer of 2019 and the daily precipitation in the south of the middle and lower reaches of the Yangtze River valley showed an abrupt change from flood to drought conditions around *** highest precipitation in 39 yr was recorded between 1 June and 14 July *** circulation systems affecting this high precipitation included a persistent deepened East Asian trough,the southward location of the western Pacific subtropical high,an intensified East Asian subtropical jet,an anomalous low-level cyclone from southern Japan to southern China,and extremely strong positive vorticity over the Jiangnan *** different atmospheric circulation anomalies from 15 July to 31 August caused continuously high temperatures,below-normal precipitation,and severe drought in Jiangnan *** investigations showed that the sudden change in atmospheric circulation around mid-July started in the mid and lower troposphere and was influenced by the northward track of Tropical Cyclone Danas in the northwestern Pacific.

关键词： abrupt changes summer precipitation East Asian trough western Pacific subtropical high tropical cyclone

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Real-time evaluation method of flight mission load based on sensitivity analysis of physiological factors

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Chinese Journal of Aeronautics 2022年第3期35卷 450-463页

作者： Jun CHEN Lei XUE Jia rong Xudong gao School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Department of Data Science and AI Monash UniversityClaytonVIC 3800Australia

As the complexity of flight missions continues to increase,sending a timely warning or providing assistance to pilots helps to reduce the probability of operational errors and flight *** pilots’physiological data,real-time evaluation of mission load is a feasible technical way to achieve *** this paper,a set of flight tasks including aircraft control,humancomputer interaction and mental arithmetic tests are designed to simulate five mission loads at different flight difficulty levels.A sensitivity analysis method based on a comprehensive test is proposed to select a set of sensitive physiological ***,based on the SVM hierarchical combination classification method,the pilot mission load real-time evaluation model is *** test results show significant differences in EMG,respiration rate(abdomen),heart rate,blood oxygen saturation,pupil area,fixation duration,number of fixations,and *** high accuracy obtained from experiments proved that the proposed real-time evaluation model is applicable to meet the requirements of real working *** findings can provide methodological references for mission load evaluation research in other fields.

关键词： Eye movement Mission load Physiological data Sensitivity analysis Support Vector Machine(SVM)

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American Barrier Option Pricing Formulas for Currency Model in Uncertain Environment

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Journal of Systems Science & Complexity 2022年第1期35卷 283-312页

作者： gao rong LIU Kaixiang LI Zhiguo LANG Liying School of Economics and Management Hebei University of TechnologyTianjin 300401China School of Management Science and Engineering Chongqing Technology and Business UniversityChongqing 400067China Hebei University of Technology Tianjin 300401China

Option pricing problem is one of the central issue in the theory of modern *** currency model has been put forward under the foundation of uncertainty theory as a tool to portray the foreign exchange rate in uncertain finance *** paper uses uncertain differential equation involved by Liu process to dispose of the foreign exchange *** an American barrier option of currency model in uncertain environment is *** important of all,the authors deduce the formulas to price four types of American barrier options for this currency model in uncertain environment by rigorous derivation.

关键词： Barrier option currency model option pricing uncertain process

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Triple effects of Sn-substitution on Na0.67Ni0.33Mn0.67O2

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Journal of Materials Science & Technology 2019年第7期35卷 1250-1254页

作者： Xiaohui rong Fei gao Feixiang ding Yaxiang Lu Kai Yang Hong Li Xuejie Huang Liquan Chen Yong-Sheng Hu State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research InstituteBeijing 100192China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190China

Layered oxides are one of the most prom ising cathode materials for sodium ion batteries (NIBs), however, the relatively low working voltage hinders the increase of energy density thus limiting the application scenarios of NIBs. Here we prepared and investigated a series of Sn^4+ substituted NaO.67NiO.33M na67-xSnxO2 (x = 0.10, 0.20, 0.30, 0.33) and found that Sn-substitution can induce three effects: promoting O3-stack formation, sm oothing the voltage profile and increasing the working voltage to -3.6 V. This study would enrich the knowledge of Sn-substitution and give guide to the better design of high-voltage cathode materials for NIBs.

关键词： Sodium-ion batteries Layered oxide cathode Tin-based Cathode

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Distributed Fault Estimation for Nonlinear Systems With Sensor Saturation and Deception Attacks Using Stochastic Communication Protocols

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1865-1876页

作者： Weiwei Sun Xinci gao Lusong ding Xiangyu Chen Institute of Automation Qufu Normal UniversityQufu 273165China

This paper is aimed at the distributed fault estimation issue associated with the potential loss of actuator efficiency for a type of discrete-time nonlinear systems with sensor *** the distributed estimation structure under consideration,an estimation center is not necessary,and the estimator derives its information from itself and neighboring nodes,which fuses the state vector and the measurement *** an effort to cut down data conflicts in communication networks,the stochastic communication protocol(SCP)is employed so that the output signals from sensors can be ***,a recursive security estimator scheme is created since attackers randomly inject malicious signals into the selected *** this basis,sufficient conditions for a fault estimator with less conservatism are presented which ensure an upper bound of the estimation error covariance and the mean-square exponential boundedness of the estimating ***,a numerical example is used to show the reliability and effectiveness of the considered distributed estimation algorithm.

关键词： Actuator fault deception attacks distributed estimation sensor saturation stochastic communication protocol(SCP).

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