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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang xuheng Chen Junfang Bao Qiuyue Hao heng Zheng Runsheng xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

Preparation and properties of bifunctional Gd_(2)O_(3)/GQD composite nanoparticles

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Journal of Rare Earths 2022年第7期40卷 1118-1125页

作者： Chengjie xu Meigui ou Hao Zhou Chunlin yang College of Materials and Metallurgy University of GuizhouGuiyang 550025China National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology Guiyang 550025China College of Chemistry and Materials Engineering Guiyang UniversityGuiyang 550003China

Nanocomposites of graphene quantum dots(GQDs)modified gadolinium oxide(Gd_(2)O_(3))particles were successfully *** addition,the effects of the amount of GQDs and the particle size of Gd_(2)O_(3)on the properties of nanocomposites were *** structures and properties of nanoparticles were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,Fourier transform infrared spectroscopy,field emission scanning electron microscopy,transmission electron microscopy,photoluminescence spectrometry,and magnetic resonance *** results show that the synthesized particles Gd_(2)O_(3)/GQD are spherical with a diameter of approximately 40 nm and have excellent fluorescence and magnetic property,and its relaxation rate(r_(1)=25.18(mmol/L)^(-1)/s)is higher than that of the typical commercial contrast agents Gd-DTPA(r_(1)=4.5(mmol/L)^(-1)/s),The fluorescence property of Gd_(2)O_(3)/GQD is optimized by varying the V_(GQDs):V_(Gd2O3)ratio,and 1:1 ratio of V_(GQDs):V_(Gd2O3)results in the best fluorescence *** large particles of Gd_(2)O_(3)improve the relaxation property of ***,the nanocomposites Gd_(2)O_(3)/GQD with magnetic and fluorescence characteristics can be used in biological imaging,drug targeting,and in-vivo diagnostic analysis.

关键词： Gd_(2)O_(3)/GQD Magnetic Fluorescence Magnetic resonance imaging(MRI) Rare earths

基于光谱技术的典型互花米草入侵湿地土壤属性预测研究

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光谱学与光谱分析 2025年第1期45卷 197-203页

作者：陈旭曹思珩杨仁敏陈秋宇李建国徐璐 4 江苏师范大学地理测绘与城乡规划学院地理信息科学系江苏徐州221116

为了高效监测互花米草入侵海岸带湿地生态系统的土壤属性变化,选取江苏省盐城湿地珍禽国家级自然保护区的一处典型互花米草入侵湿地作为研究区,利用随机分层采样方法选取15个样点,在3个深度(0~30、30~60、60~100 cm)共采集45个土壤样品... 详细信息

为了高效监测互花米草入侵海岸带湿地生态系统的土壤属性变化,选取江苏省盐城湿地珍禽国家级自然保护区的一处典型互花米草入侵湿地作为研究区,利用随机分层采样方法选取15个样点,在3个深度(0~30、30~60、60~100 cm)共采集45个土壤样品,测定了土壤可见光-近红外反射光谱和10种土壤理化属性,研究了偏最小二乘和随机森林两种方法的预测能力,分析了不同光谱变换形式对预测精度的影响,探讨了入侵年限和土壤深度作为辅助预测变量的潜力。结果表明:(1)可见光-近红外光谱技术可以较好地预测有机碳、无机碳、全氮、含水量、pH、容重、盐分和黏粒等属性;(2)偏最小二乘回归法比随机森林法更适合监测互花米草入侵湿地的关键土壤理化属性,利用偏最小二乘法对土壤属性建立的预测模型精度(R^(2))在0.341~0.979之间,随机森林方法对土壤属性建立的预测模型精度(R^(2))最高为0.722;(3)基于原始光谱可以获得土壤全氮的最优预测模型(R^(2)为0.769,RMSE为0.091 g·kg^(-1)),而其他土壤属性的最优模型多是基于微分变换或倒数变换建立的模型,微分变换和倒数变换可以有效地提高模型预测精度;(4)模型预测精度在加入入侵年限和土壤深度两个变量后总体上有所提高,其中有机碳、全氮、盐分、pH和容重等属性的预测精度对这两个变量更为敏感,土壤有机碳最优模型的精度(R^(2))从0.794提高到0.806,pH最优模型的精度(R^(2))从0.838提升至0.884,盐分最优模型的精度(R^(2))从0.978提升至0.997。综上所述,可见光-近红外光谱技术在互花米草入侵湿地关键土壤理化属性预测方面具有明显的优越性,通过适当的光谱变换、变量筛选、模型选择等方面可以实现互花米草入侵湿地土壤变化的快速监测。

关键词：互花米草入侵可见光-近红外光谱土壤监测偏最小二乘法随机森林光谱变换

Emerging wearable flexible sensors for sweat analysis

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Bio-Design and Manufacturing 2022年第1期5卷 64-84页

作者： Wenzheng heng Geng yang Woo SooKim Kaichen xu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Andrew and Peggy Cherng Department of Medical Engineering California Institute of TechnologyPasadenaCA 91125USA School of Mechatronic Systems Engineering Simon Fraser UniversitySurreyBC V3T 0A3Canada

Sweat,as a biofluid with the potential for noninvasive collection,provides profound insights into human health conditions,because it contains various chemicals and information to be utilized for the monitoring of well-being,stress levels,exercise,and ***,wearable sweat sensors have been developed as a promising substitute to conventional laboratory sweat detection *** sensors are promising to realize low-cost,real-time,in situ sweat measurements,and provide great opportunities for health status evaluation analysis based on personalized big *** review first presents an overview of wearable sweat sensors from the perspective of basic components,including materials and structures for specific sensing applications and *** strategies and specific methods of the fabrication of wearable power management are also ***,current challenges and future directions of wearable sweat sensors are discussed.

关键词： Flexibleelectronics Wearablesensors Sweat sensors Electrochemical analysis Noninvasivehealth monitoring Powersupply

Algebraic Approach to the Study of Quantum Integrability

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Chinese Physics Letters 1999年第1期16卷 6-8页

作者： xu Gong-ou yang Ya-tian Department of Physics Nanjing UniversityNanjing 210093 Department of Physics Fujian Normal UniversityFuzhou 350007

The basic problem of quantum integrability has been systematically studied with an algebraic *** the introduction of the dynamical symmetry algebra the difficulty in transferring the classical integrability condition into quantum mechanics is *** the superconvergent technique of Kolmogorov,it has been proved that systems with Hamiltonians expressed merely with elements of a definite dynamical symmetry algebra form an integrable class of systems corresponding to that dynamical symmetry.

关键词： dynamical algebra symmetry

Nanoconfinement-induced water molecules and hydrogen molecules transport behaviors in ball-in-ball structure photocatalysts to improve hydrogen evolution

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Nano Research 2024年第5期17卷 3752-3760页

作者： Ben Chong Baorong xu He Li Honghui ou Guidong yang XJTU-Oxford Joint International Research Laboratory of Catalysis School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China

The diffusion,adsorption/desorption behaviors of water molecules and hydrogen molecules are of great importance in heterogeneous photocatalytic hydrogen *** the study of structure-property-performance relationships,nanoconfined space provides an ideal platform to promote mass diffusion and transfer due to their extraordinary properties that are different from the bulk ***,we designed and prepared a nanoconfined CdS@SiO_(2)-NH_(2) nanoreactor,whose shell is composed of amino-functionalized silica nanochannels,and encapsulates spherical CdS as a photocatalyst *** and simulated results reveal that the amino-functionalized nanochannels promote water molecules’and hydrogen molecules’directional diffusion and *** molecules are enriched in the nanocavity between the core and the shell,and promote the interfacial photocatalytic *** a result,the maximized water enrichment and minimized hydrogen-occupied active sites enable photocatalyst with optimized mass transfer kinetics and localization electron distribution on the CdS surface,leading to superior hydrogen production performance with activity as high as 37.1 mmol·g^(-1)·h^(-1).

关键词： nanochannels photocatalytic hydrogen evolution mass transfer amino-functionalized CdS

Omics Views of Mechanisms for Cell Fate Determination in Early Mammalian Development

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Genomics, Proteomics & Bioinformatics 2023年第5期21卷 950-961页

作者： Lin-Fang Ju heng-Ji xu Yun-Gui yang Ying yang Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Genomic and Precision Medicine Collaborative Innovation Center of Genetics and DevelopmentBeijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijing 100101China Institute of Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China

During mammalian preimplantation development,a totipotent zygote undergoes several cell cleavages and two rounds of cell fate determination,ultimately forming a mature *** with compaction,the establishment of apicobasal cell polarity breaks the symmetry of an embryo and guides subsequent cell fate *** the lineage segregation of the inner cell mass(ICM)and trophectoderm(TE)is the first symbol of cell differentiation,several molecules have been shown to bias the early cell fate through their inter-cellular variations at much earlier stages,including the 2-and 4-cell *** underlying mechanisms of early cell fate determination have long been an important research *** this review,we summarize the molecular events that occur during early embryogenesis,as well as the current understanding of their regulatory roles in cell fate ***,as powerful tools for early embryogenesis research,single-cell omics techniques have been applied to both mouse and human preimplantation embryos and have contributed to the discovery of cell fate ***,we summarize their applications in the research of preimplantation embryos,and provide new insights and perspectives on cell fate regulation.

关键词： Cell fate determination Cellular heterogeneity Cell polarity Single-cell omics Mammalian preimplantation embryo

Obstacle avoidance in human-robot cooperative transportation with force constraint

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Science China(Information Sciences) 2023年第1期66卷 334-335页

作者： Ying ZHANG Chenguang yang Sheng xu Yongsheng ou College of Automation Science and Engineering South China University of Technology Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences

Dear editor,Robots are often conceived as human-like machines that can interact with humans naturally and safely. Human-robot interaction means that robots can communicate with people,understand their needs, and act accordingly [1]. This interaction is critical when two people are needed to finish a task cooperatively.

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ChatGPT for shaping the future of dentistry: the potential of multi-modal large language model

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International Journal of Oral Science 2023年第3期15卷 377-389页

作者： Hanyao Huang ou Zheng Dongdong Wang Jiayi Yin Zijin Wang Shengxuan Ding heng Yin Chuan xu Renjie yang Qian Zheng Bing Shi State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&Department of Oral and Maxillofacial Surgery West China Hospital of StomatologySichuan UniversityChengduChina Department of Civil Environmental&Construction EngineeringUniversity of Central FloridaOrlandoUSA College of Transportation Engineering University of Central FloridaOrlandoUSA School of Transportation and Logistics Southwest Jiaotong UniversityChengduChina C2SMART Center Tandon School of EngineeringNew York UniversityBrooklynUSA State Key Laboratory of Oral Diseases&National Clinical Research Center for Oral Diseases&Eastern Clinic West China Hospital of StomatologySichuan UniversityChengduChina

The ChatGPT,a lite and conversational variant of Generative Pretrained Transformer 4(GPT-4)developed by OpenAI,is one of the milestone Large Language Models(LLMs)with billions of *** have stirred up much interest among researchers and practitioners in their impressive skills in natural language processing tasks,which profoundly impact various *** paper mainly discusses the future applications of LLMs in *** introduce two primary LLM deployment methods in dentistry,including automated dental diagnosis and cross-modal dental diagnosis,and examine their potential ***,equipped with a cross-modal encoder,a single LLM can manage multi-source data and conduct advanced natural language reasoning to perform complex clinical *** also present cases to demonstrate the potential of a fully automatic Multi-Modal LLM AI system for dentistry clinical *** LLMs offer significant potential benefits,the challenges,such as data privacy,data quality,and model bias,need further ***,LLMs have the potential to revolutionize dental diagnosis and treatment,which indicates a promising avenue for clinical application and research in dentistry.

关键词： modal equipped operations