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The determination of sedimentary environment and associated energy in deep-buried marine carbonates:insights from natural gamma ray spectrometry log

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Frontiers of Earth Science 2024年第1期18卷 204-218页

作者： Jingyan LIU Qian CHANG Junlong ZHANG Hui CHAI Feng HE Yizan YANG Shiqiang XIA School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Exploration and Development Research institute Daqing Oilfield CompanyPetroChinaDaqing 163712China China National Oil and Gas Exploration and Development Co. Ltd(CNODC)Beijing 100032China Beijing Research institute of Uranium Geology Beijing 100029China College of Mining engineering North China University of Science and TechnologyTangshan 063210China

It has always been challenging to determine the ancient sedimentary environment and associated energy in deep-buried marine *** energy represents the hydrodynamic conditions that existed when the carbonates were *** energy includes light and chemical energies in compounds and kinetic energy in currents and mass ***-buried marine carbonates deposited during the Ordovician depositional period in the eastern Tarim Basin result from a complex interplay of tectonics,sedimentation,and *** a result,determining the ancient sedimentary environment and associated energy is *** natural gamma-ray spectrometry(GRS)log(from 12 wells)is used in this paper to conduct studies on the sedimentary environment and associated energy in deep-buried marine *** findings show that the values of thorium(Th),uranium(U),potassium(K),and gamma-ray without uranium(KTh)in a natural GRS log can reveal lithological associations,mineral composition,diagenetic environment,stratigraphic water activity,and ancient climatic *** the Ordovician,quantitative analysis and determination of sedimentary environment energy are carried out using a comprehensive calculation of natural GRS log parameters in typical wells(penetrating through the Ordovician with cores and thin sections)of well GC4,well GC6,well GC7,and well *** results show that GRS log can determine different lithology associations in typical wells than a sieve residue ***,cores and thin sections can be used to validate the determination of lithology *** on the determination of lithology associations,the lithology associations that reflect the sedimentary environment and associated energy can be analyzed in a new ***,the sedimentary environment energy curve derived from a natural GRS log can reveal hydrodynamic fluctuations during depositional periods,which will aid in the discovery of carbonate reservoirs,establishing sequence stratigra

关键词： ancient sedimentary environment energy of sedimentary environment marine deep-buried carbonates natural GRS the Ordovician eastern Tarim Basin

Leaching kinetics and permeability of polyethyleneimine added ammonium sulfate on weathered crust elution-deposited rare earth ores

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Journal of Rare Earths 2024年第8期42卷 1610-1619,I0008页

作者： Huifang Yang Aoyang Sha Zhengyan He Chenjie Wu Yuanlai Xu Jingjing Hu Zhigao Xu Ru'an Chi Key Laboratory for Green Chemical Process of Ministry of Education School of Resources&Safety EngineeringWuhan Institute of TechnologyWuhan 430073China Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central MinzuUniversityWuhan430074China

At present,in-situ leaching of weathered crust elution-deposited rare earth ores(WCE-DREOs) encounter with problems such as long leaching cycles,slow infiltration rate and low product *** order to solve the above problems,the conventional leaching agent ammonium sulfate((NH_(4))_(2)SO_(4)) was compounded with polymeric surfactant polyethyleneimine(PEI) to form a composite leaching *** effects of leaching temperature,PEI *** rate and pH on leaching kinetics and permeability of rare earths(RE) and aluminum(AI) in orebody were *** is found that with temperature increasing,the time required to reach leaching equilibrium for both RE and Al is shortened,the apparent activation energies of RE and AI are 14.79 and 13.45 kJ/mol,respectively,and the leaching processes are in accordance with the outer diffusion control,When the concentrations of(NH_(4))_(2)SO_(4) and PEI in the composite leaching agent are 2.0 wt% and 0.4 wt%;the time required to reach leaching equilibrium for RE and AI is about 50% shorter than that using(NH_(4))_(2)SO_(4) alone,and the leaching efficiencies of RE are slightly higher than that of *** increasing the temperature and flow rate of the composite leaching agent can improve the leaching efficiencies of RE and Al,but pH has neglected effects on the leaching efficiencies of *** PEI concentrations below 0,4 wt%, the addition of PEI promotes the leaching of RE and *** column leaching studies of the WCE-DREO,the addition of 0.4 wt% PEI to the traditional leaching agent(NH_(4))_(2)SO_(4) has no impact on the leaching efficiencies of ***,it can significantly increase the infiltration rate of WCE-DREO,shortening the leaching time per 10 mL effluent from about 30 min for(NH_(4))_(2)SO_(4) leaching system to 20 min for the composite leaching *** leaching time is shortened by one-third,and the leaching cost is reduced,which can provide theoretical guidance for the development and commercial implementa

关键词： Polyethyleneimine Kinetics Rare earths Permeability Activation energy

Asymmetric Electrolytes Design for Aqueous Multivalent Metal Ion Batteries

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Nano-Micro Letters 2024年第3期16卷 227-253页

作者： Xiaochen Yang Xinyu Wang Yue Xiang Longtao Ma Wei Huang Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China School of Materials Science and engineering Guangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510641People’s Republic of China

With the rapid development of portable electronics and electric road vehicles,high-energy-density batteries have been becoming front-burner ***,homogeneous electrolyte cannot simultaneously meet diametrically opposed demands of high-potential cathode and low-potential anode,which are essential for high-voltage ***,homogeneous electrolyte is difficult to achieve bi-or multi-functions to meet different requirements of *** comparison,the asymmetric electrolyte with bi-or multi-layer disparate components can satisfy distinct requirements by playing different roles of each electrolyte layer and meanwhile compensates weakness of individual ***,the asymmetric electrolyte can not only suppress by-product sedimentation and continuous electrolyte decomposition at the anode while preserving active substances at the cathode for high-voltage batteries with long cyclic *** this review,we comprehensively divide asymmetric electrolytes into three categories:decoupled liquid-state electrolytes,bi-phase solid/liquid electrolytes and decoupled asymmetric solid-state *** design principles,reaction mechanism and mutual compatibility are also studied,***,we provide a comprehensive vision for the simplification of structure to reduce costs and increase device energy density,and the optimization of solvation structure at anolyte/catholyte interface to realize fast ion transport kinetics.

关键词： Asymmetric electrolyte Aqueous multivalent metal ion batteries Electrochemical stability windows Electrolyte interface

Energy-efficient joint UAV secure communication and 3D trajectory optimization assisted by reconfigurable intelligent surfaces in the presence of eavesdroppers

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Defence Technology（防务技术） 2024年第1期31卷 537-543页

作者： Huang Hailong Mohsen Eskandari Andrey V.Savkin Wei Ni The Department of Aeronautical and Aviation engineering The Hong Kong Polytechnic UniversityHong KongChina School of Electrical engineering and Telecommunications University of New South WalesSydney2052Australia Data61 CSIROAustralia

We consider a scenario where an unmanned aerial vehicle(UAV),a typical unmanned aerial system(UAS),transmits confidential data to a moving ground target in the presence of multiple *** friendly reconfigurable intelligent surfaces(RISs) help to secure the UAV-target communication and improve the energy efficiency of the *** formulate an optimization problem to minimize the energy consumption of the UAV,subject to the mobility constraint of the UAV and that the achievable secrecy rate at the target is over a given *** present an online planning method following the framework of model predictive control(MPC) to jointly optimize the motion of the UAV and the configurations of the *** effectiveness of the proposed method is validated via computer simulations.

关键词： Unmanned aerial systems(UASs) Unmanned aerial vehicle(UAV) communication security Eaves-dropping Reconfigurable intelligent surfaces(RIS) Autonomous navigation and placement Path planning Model predictive control

Modeling the drain current and its equation parameters for lightly doped symmetrical double-gate MOSFETs

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Journal of Semiconductors 2015年第4期36卷 44-50页

作者： Mini Bhartia Arun Kumar Chatterjee Electronics and communication Department Thapar Institute of Engineering and Technology

A 2D model for the potential distribution in silicon film is derived for a symmetrical double gate MOS- FET in weak inversion. This 2D potential distribution model is used to analytically derive an expression for the subthreshold slope and threshold voltage. A drain current model for lightly doped symmetrical DG MOSFETs is then presented by considering weak and strong inversion regions including short channel effects, series source to drain resistance and channel length modulation parameters. These derived models are compared with the simulation results of the SILVACO （Atlas） tool for different channel lengths and silicon film thicknesses. Lastly, the effect of the fixed oxide charge on the drain current model has been studied through simulation. It is observed that the obtained analytical models of syrnmetrical double gate MOSFETs are in good agreement with the simulated results for a channel length to silicon film thickness ratio greater than or equal to 2.

关键词： double gate MOSFET 2D potential distribution model drain current model

Phase engineering of Ni-Mn binary layered oxide cathodes for sodiumion batteries

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Journal of Energy Chemistry 2024年第4期91卷 501-511页

作者： Feifei Hong Xin Zhou Xiaohong Liu Guilin Feng Heng Zhang Weifeng Fan Bin Zhang Meihua Zuo Wangyan Xing Ping Zhang Hua Yan Wei Xiang College of Materials and Chemistry&Chemical engineering Chengdu University of TechnologyChengdu 610059SichuanChina College of Chemical engineering Sichuan UniversityChengdu 610065SichuanChina Research institute for Electronic Science(RIES)and Division of Information Science and Technology Graduate School of Information Science and TechnologyHokkaido UniversityN20W10SapporoHokkaido 001-0020Japan School of Materials Science and engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina Yibin Libode New Materials Co. Ltd.Yibin 644200SichuanChina engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina

Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional *** composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/03,and P2/P3/O3-Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3-Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3 *** observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 *** systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.

关键词： Phase engineering Ni-Mn layered oxide Cathode Sodium-ion batteries

Corrigendum to“Bi-continuous Mg-Ti interpenetrating-phase composite as a partially degradable and bioactive implant material”[Journal of Materials Science&Technology 146(2023)211-220]

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Journal of Materials Science & Technology 2024年第3期170卷 255-257页

作者： Chenxi Dou Mingyang Zhang Dechun Ren Haibin Ji Zhe Yi Shaogang Wang Zengqian Liu Qiang Wang Yufeng Zheng Zhefeng Zhang Rui Yang Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and engineering Peking UniversityBeijing 100871China Center for Adaptive System engineering School of Creativity and ArtShanghaiTech UniversityShanghai 201210China

The authors are very sorry for their carelessness that there are some problems with Fig.3 in the original manuscript.

关键词： composite phase partially

一种具有分形结构的弹黏塑性材料建模及其求解方法

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Acta Mechanica Sinica 2024年第3期40卷 176-190页

作者：李德建祁浩张鸣原霍君豪刘江硕饶远昊 State Key Laboratory for GeoMechanics and Deep Underground engineering China University of Mining and TechnologyBeijing100083China institute for Deep Underground Science and engineering Beijing100083China School of Mechanics and Civil engineering China University of Mining and TechnologyBeijing100083China China Academy of Urban Planning and Design Beijing100044China

本文建立了一种具有分形结构的元件模型,用于描述材料弹粘塑性特性,并可以在无需求解相应的无限阶微分方程的情况下获得各载荷作用下模型的力学反应.首先,基于这种建模方法,建立了表征具有复杂无限阶分形结构材料弹黏塑性特性的混联元... 详细信息

本文建立了一种具有分形结构的元件模型,用于描述材料弹粘塑性特性,并可以在无需求解相应的无限阶微分方程的情况下获得各载荷作用下模型的力学反应.首先,基于这种建模方法,建立了表征具有复杂无限阶分形结构材料弹黏塑性特性的混联元件模型(L-R模型).然后,利用MATLAB/Simulink,借助弹簧(弹性)、黏壶(黏性)和塑性体(塑性)单元的本构关系来描述材料的基本力学性能.之后,将宾厄姆模型作为基本模型按照分形理论进行迭代,通过求解得到描述材料在各种载荷作用下的力学(弹黏塑性)反应.最后,为了验证该建模方法及其求解结果的可靠性,在钢、板岩、煤、红砂岩和盐岩五种不同分形结构的材料上进行了循环载荷实验.将实验结果与求解结果进行比较,表明所建立的模型能够有效地描述材料的弹黏塑性性能.

关键词： Infinite order fractal structure Elastic-viscous-plastic properties Element model Experimental simulation

GSM-MRF based classification approach for real-time moving object detection

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2008年第2期9卷 250-255页

作者： Xiang PAN Yi-jun WU institute of Information and communication engineering Zhejiang University Hangzhou 310027 China

Statistical and contextual information are typically used to detect moving regions in image sequences for a fixed *** this paper,we propose a fast and stable linear discriminant approach based on Gaussian Single Model(GSM)and Markov Random Field(MRF).The performance of GSM is analyzed first,and then two main improvements corresponding to the drawbacks of GSM are proposed:the latest filtered data based update scheme of the background model and the linear classification judgment rule based on spatial-temporal feature specified by *** results show that the proposed method runs more rapidly and accurately when compared with other methods.

关键词： Moving object detection Markov Random Field (MRF) Gaussian Single Model (GSM) Fisher Linear Discriminant Analysis (FLDA)