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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

Microglia:a promising therapeutic target in spinal cord injury

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Neural Regeneration Research 2025年第2期20卷 454-463页

作者： Xiaowei Zha Guoli zheng Thomas Skutella Karl Kiening Andreas Unterberg Alexander Younsi Department of Neurosurgery Heidelberg University HospitalHeidelbergGermany Department of Neuroanatomy Institute for Anatomy and Cell BiologyHeidelberg UniversityHeidelbergGermany

Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal *** a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal *** this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor *** a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive *** review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.

关键词： astrocytes cytokines functional recovery immune regulation M1/M2 activation macrophages microglia neuroinflammation spinal cord injury therapy

Joint target delay determination and rate control for real-time videos in heterogeneous wireless networks

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The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 36-48,62页

作者： Chen Feng Zhu Daoping Jiang Chen zheng Mingkui Lin nan College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

In heterogeneous wireless networks with time-varying channels,the video rate is usually adjusted based on the network bandwidth to guarantee ultra-low latency video transmission under an end-to-end target delay ***,the target delay with a fixed value according to historical experience cannot guarantee the quality of video continuously since wireless network bandwidth changes rapidly,especially when the network *** alternative scheme is to dynamically set the target delay according to the network status within an acceptable delay ***,this scheme cannot be ensured in heterogeneous wireless networks with time-varying ***,to address this issue,a multi-objective optimization algorithm for joint optimization of rate control and target delay is proposed,where the target delay and video rate are jointly adjusted ***,to reduce the optimization complexity due to the multi-objective and multi-parameter characteristics,multi-objective optimization algorithm be decomposed and solved by optimizing each independent ***,the proposed algorithm is verified on a semi-physical simulation *** show that the frame loss rate is reduced from 6.65%to 2.06%,and a peak signal-to-noise ratio(PSNR)gain of 18.32%is obtained when the network performance is low.

关键词： heterogeneous wireless networks time-varying channels video rate target delay multi-objective optimization rate control

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In-situ construction of novel sulfur-vacancy-rich Bi/Bi_(2)S_(3)/SnS_(2)Z-scheme heterostructure photocatalysts for efficient Cr(Ⅵ)reduction and nitrogen fixation

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Journal of Materials Science & Technology 2023年第36期167卷 237-247页

作者： Meng Lan Xiaoli Dong nan zheng Xiaoxin Zhang Yu Wang Xinxin Zhang School of Light Industry and Chemical Engineering Dalian Polytechnic UniversityDalian 116034China

Highly competent and economical photocatalysts are one of the most charming targets in environmental restoration and clean ***,a novel sulfur-vacancy-rich Bi/Bi_(2)S_(3)/SnS_(2)Z-scheme heterostruc-ture was constructed in situ and applied for the photoreduction Cr(VI)and nitrogen *** fab-ricated Bi/Bi_(2)S_(3)/SnS_(2)-2 exhibits the optimum photoreduction Cr(VI)performance with the efficiency of 94.5%within 15 min visible light *** remarkably enhanced catalytic efficiency derived from the synergistic effect of the construction of intimate contacted interface,abundant sulfur vacancy and surface plasmon resonance(SPR)effect of metal ***,the excellent photocatalytic nitrogen fix-ation property(96.4μmol g^(-1)h^(-1))was achieved by Bi/Bi_(2)S_(3)/SnS_(2)-2 under full solar illumination because sulfur vacancy could provide sufficient catalytic sites to accelerate the adsorption and nitrogen *** Z-scheme heterostructure was proposed to expound the photocatalytic *** work offers a new perspective on hierarchical heterostructure with plentiful vacancies for environmental remediation and energy development.

关键词： Sulfur-vacancy-rich Bi/Bi_(2)s_(3)/SnS_(2) Z-scheme heterostructure SPR effect Cr(VI)reduction Nitrogen fixation

TDS-1 GNSS reflectometry wind geophysical model function response to GPS block types

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Geo-Spatial Information Science 2022年第2期25卷 312-324页

作者： Fade Chen Xiaohong Zhang Fei Guo Jiazhu zheng Yang nan Mohamed Freeshah School of Geodesy and Geomatics Wuhan UniversityWuhanChina College of Civil Engineering Nanjing Forestry UniversityNanjingChina GNSS Research Center Wuhan UniversityWuhanChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina Surveying Engineering Department Shoubra Faculty of EngineeringBenha UniversityBenhaEgypt

This paper presents the TDS-1 GNSS reflectometry wind Geophysical Model Function(GMF)response to GPS block *** observables were extracted from Delay Doppler Maps(DDMs)after taking the receiver antenna gains effects and GNSS-R geometry effects into *** the DDM is affected by GPS EffectiveIsotropic Radiated Power(EIRP),we first investigate the sensitivity of observables to the GPS ***,the observables at high SNRs are more sensitive to wind speed,but the spatial coverage at high signal to noise ratios(SNRs)is lower,while DDMs at low SNRs have the opposite *** balance the accuracy and spatial coverage,the DDM datasets are divided into two parts:high SNR(>0 dB)and low SNR(>−10 dB and≤0 dB)to develop wind ***,the influences of GPS block on wind speed retrieval both at high and low SNR is *** show that the block types have impacts on wind GMF and the use of a prior GPS block can contribute to a better wind speed retrieval both at high and low *** with ASCAT,the Root Mean Square Error(RMSE)value of wind speed retrieval at high and low SNR are 2.19 m/s and 3.13 m/s,respectively,when all TDS data are processed without distinguishing GPS block ***,if the TDS data are separately processed and used to develop wind GMF through different blocks,both the accuracy and correlation coefficient can be improved to some ***,the influence of significant height of the swell(Hs)on SNR observables is analyzed,and it is demonstrated that there is no obvious linear or nonlinear relationship between them.

关键词： Global Navigation Satellite System-Reflectometry(GNSS-R) Delay-Doppler Map(DDM) wind speed Geophysical Model Function(GMF) TechDemoSat-1(TDS-1) GPS block

Investigation of temperature effect on stress of flexspline

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Applied Mathematics and Mechanics(English Edition) 2014年第6期35卷 791-798页

作者：项青尹征南 Shanghai Institute of Applied Mathematics & Mechanics Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

The effect of temperature loading on the stress of a flexspline is investigated. Based on the geometric and mechanical characteristics of the harmonic gear flexspline, a circular thin shell model is presented in this paper. The theoretical solution for the flexspline under different displacement loads and different temperature fields is derived. Meanwhile, an impact factor formula, which reflects the effect of the temperatures of the inner and outer surfaces of the flexspline on the stress of the flexspline, is presented. Finally, numerical calculations by the finite element method （FEM） are adopted to verify the corresponding conclusions.

关键词： thermal stress harmonic flexspline thin shell finite element method (FEM)

In Situ Investigation of Si-Poisoning Effect in Al-Cu-Si Alloys Inoculated by Al-5Ti-1B

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 146-156页

作者： Yiwang Jia Dongfu Song nan Zhou Kaihong zheng Yanan Fu Da Shu Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Institute of New MaterialsGuangdong Academy of SciencesGuangzhou510650China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201204China Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

In situ synchrotron X-radiography was carried out on Al-13 Cu and Al-13 Cu-7 Si alloys with and without addition of Al-5 Ti-1 B master *** effects of Si content on grain growth and the solute-suppressed nucleation zone(SSNZ)were quantitatively *** average grain size can be refined to 164μm of Al-13 Cu alloy inoculated by Al-5 *** addition of 7%Si content,a large number of TiB 2 sites in the melt lost the inoculating ability due to"Si poisoning."The radius of the dendrite tip curvature of Al-13 Cu is more than two times as large as that of Al-13 Cu-7 *** sharper tip is able to disperse the solute more effectively and thus grains can grow more *** causes that the dendrite arm growth rate with addition of 7%Si solute is about 2.6 times that of no Si *** addition,the solute enrichment in the SSNZ of Al-13 Cu is faster,and the area change of SSNZ is slower than that of Al-13 Cu-7 *** more nucleation sites in the SSNZ cannot be activated with addition of *** study will shed light on the understanding of Si poisoning in casting Al-Cu-Si alloys.

关键词： Al-Si alloy Dendrite tip Si poisoning X-ray radiography Al-5Ti-1B

Advances on hormone-like activity of Panax ginseng and ginsenosides

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Chinese Journal of Natural Medicines 2020年第7期18卷 526-535页

作者： TIAN Mei LI Lin-nan zheng Rui-Rong YANG Li WANG zheng-Tao The MOE Key Laboratory of Standardization of Chinese Medicines Shanghai Key Laboratory of Compound Chinese Medicinesand the SATCM Key Laboratory of New Resources and Quality Evaluation of Chinese MedicinesInstitute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China

Traditional Chinese medicine(TCM)has been paid much attentions due to the prevention and treatment of steroid hormone ***,the root of Panax ginseng ***(Araliaceae),is one of the most valuable herbs in complementary and alternative medicines around the world.A series of dammarane triterpenoid saponins,also known as phytosteroids,were reported as the primary ingredients of Ginseng,and indicated broad spectral pharmacological actions,including anti-cancer,anti-inflammation and *** skeletons of the dammarane triterpenoid aglycone are structurally similar to the steroid *** in vitro and in vivo studies showed that Ginseng and its active ingredients have beneficial hormone-like role in hormonal *** review thus summarizes the structural similarities between hormones and dammarane ginsenosides and integrates the analogous effect of Ginseng and ginsenosides on prevention and treatment of hormonal disorders published in recent twenty years(1998–2018).The review may provide convenience for anticipate structure-function relationship between saponins structure and hormone-like effect.

关键词： Panax ginseng steroid hormones triterpenoid saponins hormone-like activity molecular signaling

Analyzing the inconsistency in driving patterns between manual and autonomous modes under complex driving scenarios with a VR-enabled simulation platform

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Journal of Intelligent and Connected Vehicles 2022年第3期5卷 215-234页

作者： zheng Xu Yihai Fang nan zheng Hai L.Vu Department of Civil Engineering Monash UniversityClaytonAustralia

Purpose–With the aid of naturalistic simulations,this paper aims to investigate human behavior during manual and autonomous driving modes in complex ***/methodology/approach–The simulation environment is established by integrating virtual reality interface with a micro-simulation *** the simulation,the vehicle autonomy is developed by a framework that integrates artificial neural networks and genetic ***subject experiments are carried,and participants are asked to virtually sit in the developed autonomous vehicle(AV)that allows for both human driving and autopilot functions within a mixed traffic ***–Not surprisingly,the inconsistency is identified between two driving modes,in which the AV’s driving maneuver causes the cognitive bias and makes participants feel *** though only a shallow portion of the cases that the AV ended up with an accident during the testing stage,participants still frequently intervened during the AV *** a similar note,even though the statistical results reflect that the AV drives under perceived high-risk conditions,rarely an actual crash can *** suggests that the classic safety surrogate measurement,***-tocollision,may require adjustment for the mixed traffic *** limitations/implications–Understanding the behavior of AVs and the behavioral difference between AVs and human drivers are important,where the developed platform is only the first effort to identify the critical scenarios where the AVs might fail to *** implications–This paper attempts to fill the existing research gap in preparing close-to-reality tools for AV experience and further understanding human behavior during high-level autonomous *** implications–This work aims to systematically analyze the inconsistency in driving patterns between manual and autopilot modes in various driving scenarios(*** scenes and various traffic conditions)to facilitate user accep

关键词： Autonomous vehicle Naturalistic simulation Virtual reality Cognitive bias Intervention behavior