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A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingm.ng Wen Jiayun Dan Youyuan Jiang Guangchao Wei Jiaxin cui Jiangxi Provincial Key Laboratory for Simulation and modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Schoolof Transportation and Vehicle Enginering Shandong University of TechnologyZibo255000China

Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex phase change process of iron ore particles in this zone is still not well *** this study,a novel one-dim.nsional(1D)unsteady phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore *** model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was *** results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption ***,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movem.nt of the phase interface and pro-longing the melting duration of the *** the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting *** the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4%and 8.3%,*** the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve *** the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Cohesive zone Heat transfer Phase change

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modeling of Rectangular microchannel Heat Sink with non-Uniform Channels and multi-Objective Optimization

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Journal of Thermal Science 2024年第5期33卷 1701-1711页

作者： SHAnG Xueshuo WAnG Yixin LI Qingwen WAnG Rui cui Zheng SHAO Wei Institute of Advanced Technology Shandong UniversityJi'nan 250014China Institute of Thermal Science and Technology Shandong UniversityJi'nan 250014China Shandong Institute of Advanced Technology Ji'nan 250100China

Rectangular microchannel heat sinks(mCHS)are widely used to cool high-heat-flux electronic ***,previous studies focused mainly on mCHS with uniform channels(UCs).This study considers a microchannel heat sink with non-uniform channels(nUCs).A mathematical model is developed based on energy equations and the Darcy flow *** expressions for total thermal resistance and coolant pressure drop are derived using the thermoelectric *** and numerical simulations are performed to verify the mathematical *** non-uniformity increases,total coolant pressure drop decreases but at the cost of higher thermal *** overall perform.nce of nUCs is better than that of UCs because of their lower ratio of pumping power to cooling *** transfer perform.nce of nUCs changes little for more than 120 channels and depends mainly on channel arrangem.nt.A multi-objective optimization is conducted to m.nimize the thermal resistance and pumping power of an *** optimal nUC saves 64%pumping power compared with a conventional UC for the total thermal resistance of 0.1℃/W,indicating that the use of non-uniform channels could be very helpful to reduce the flow resistance of mCHS.

关键词： microchannel heat sink non-uniform channel mathematical model multi-objective optimization

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Inter-chromosomal insertions into wild-type chromosomes induced by SCRambLE

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 125-135页

作者： Sijie Zhou Junyanrui Li Xichen cui Ying Wang Ying-Jin Yuan Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(m.nistry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Frontiers Research Institute for Synthetic Biology Tianjin UniversityTianjin 300072China

Genomic rearrangem.nts play a crucial role in shaping biological phenotypic diversity and driving species *** chromosome rearrangem.nt and modification by LoxP-mediated evolution(SCRambLE)has been applied to explore large-scale genomic rearrangem.nts,yet it has been observed that these rearrangem.nts occur exclusively in genomic regions containing loxPsym ***,we found that SCRambLE of synthetic yeast harboring synthetic chromosome V and X can generate a variety of synthetic segm.nt insertions into wild-type chromosomes,ranging from 1 to 300 ***,it was revealed that the novel insertions impacted the transcriptional level of neighboring regions and affected the production of exemplar pathway of ***,our results improve the understanding of the ability of SCRambLE to generate complex structural variations in nonsynthetic regions and provide a potential model to explore genomic transposable events.

关键词： genomic rearrangem.nts synthetic yeast genome SCRambLE inter-chromosomal insertions synthetic biology

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Cross-linkedα-amylase aggregates on Fe3O4 magnetic nanoparticles modified with polydopam.ne/polyethyleneim.ne for efficient hydrolysis of starch

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Particuology 2024年第7期90卷 98-105页

作者： Jiandong cui Xium.ng Tang Qingqing ma Yuyan Chang Qunli Zhang Shiru Jia State Key Laboratory of Food nutrition and Safety Laboratory of Industrial Fermentation MicrobiologyMinistry of EducationTianjin University of Science and TechnologyTianjin 300457China Key Laboratory of Biomass Chemical Engineering of m.nistry of Education Zhejiang UniversityHangzhou 310027China

In this workα-amylase was immobilized on magnetic Fe3O4 nanoparticles with polyethylenim.ne(PEI)/polydopam.ne(PDA)coating or 3-am.nopropyl triethoxysilane(APTES)for the first time via adsorption–precipitation–*** with the freeα-amylase,the resultant magnetic cross-linkedα-amylase aggregates(PEI/PDA-m-CLEAs and n-m-CLEAs)exhibited excellent thermal and storage stability as well as pH *** storage at 25°C for 60 days,freeα-amylase only retained 60%of its initial activity,while PEI/PDA-m-CLEAs and n-m-CLEAs retained 80%and 78%of their initial activities,***,n-m-CLEAs and PEI/PDA-m-CLEAs showed good *** 6 repeated uses,PEI/PDA-m-CLEAs and n-m-CLEAs still maintained 65%and 62%of their initial activities,***,PEI/PDA-m-CLEAs and n-m-CLEAs exhibited higher starch hydrolysis efficiency than freeα-*** maximum dextrose equivalent(DE)values of starch hydrolysis by PEI/PDA-m-CLEAs and n-m-CLEAs reached 29.24%and 28.79%within 90 m.n,***,the maximum DE values of starch hydrolysis by the freeα-amylase was only 27.89%even in 150 *** magnetic cross-linkedα-amylase aggregates could be introduced as effective biocatalyst for industrial applications in production of maltose syrups.

关键词： α-amylase magnetic nanoparticles Functional modification magnetic cross-linked enzyme aggregates Hydrolysis of starch

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Interplay between microglia and environm.ntal risk factors in Alzheimer's disease

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neural Regeneration Research 2024年第8期19卷 1718-1727页

作者： miaoping Zhang Chunmei Liang Xiongjin Chen Yujie Cai Lili cui Guangdong Key Laboratory of Age-Related Cardiac and Cerebral Diseases Affiliated Hospital of Guangdong Medical UniversityZhanjiangGuangdong ProvinceChina

Alzheimer s disease,am.ng the most comm.n neurodegenerative disorders,is chara cterized by progressive cognitive *** present,the Alzheimer’s disease main risk remains genetic ris ks,but major environm.ntal fa ctors are increasingly shown to impact Alzheimer’s disease developm.nt and ***,the most important brain imm.ne cells,play a central role in Alzheimer’s disease pathogenesis and are considered environm.ntal and lifestyle"sensors."Factors like environm.ntal pollution and modern lifestyles(e.g.,chronic stress,poor dietary habits,sleep,and circadian rhythm disorde rs)can cause neuroinflammato ry responses that lead to cognitive impairm.nt via microglial functioning and phenotypic ***,the specific mechanisms underlying interactions am.ng these facto rs and microglia in Alzheimer’s disease are ***,we:discuss the biological effects of air pollution,chronic stress,gut micro biota,sleep patterns,physical exercise,cigarette smoking,and caffeine consumption on microglia;consider how unhealthy lifestyle factors influence individual susceptibility to Alzheimer’s disease;and present the neuroprotective effects of a healthy *** intervening and controlling these environm.ntal risk fa ctors at an early Alzheimer’s disease stage,understanding the role of microglia in Alzheimer’s disease developm.nt,and to rgeting strategies to to rget microglia,co uld be essential to future Alzheimer’s disease treatm.nts.

关键词： Alzheimer’s disease chronic stress environm.ntal factor gut microbiota microglia particulate matter with diameter<2.5μm

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Perform.nce Design of High-Temperature Chloride Salts as Thermal Energy Storage material

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Journal of Thermal Science 2024年第2期33卷 479-490页

作者： ZHAO Le WAnG Jingyao cui Liu LI Baorang DU Xiaoze WU Hongwei Key Laboratory of Power Station Energy Transfer Conversion and System.north China Electric Power University) Ministry of EducationBeijing102206China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou730050China School of Physics Engineering and Computer ScienceUniversity of HertfordshireHatfieldAL109ABUK

The chloride salts have great potential used as high-temperature thermal energy storage(TES) medium for the concentrated solar power *** this study,LiCl,KCl and CaCl_(2) were selected as energy storage materials in order to further broaden the working temperature of ternary chloride salt and improve its energy storage *** new high-temperature energy storage ternary chloride composed of LiCl,KCl,and CaCl_(2) was developed based on the phase diagram generated by *** components of LiCl-KCl-CaCl_(2) with the mass ratio of 37.85%-53.38%-8.77%,30.90%-13.82%-55.28% and 1.78%-18.61%-79.61% were developed,of which the corresponding melting temperature(T_(m)) 340.93,433.57 and 626.85℃,respectively,was obtained *** that T_(m) of the third group of salts was too high,only the first two groups of salts were *** test showed that the actual melting point was only 0.46% and 1.64% different from the melting point predicted by *** thermal properties of the two ternary chloride salts were also *** solid and liquid-specific heat of ternary salts was determ.ned by DSC using sapphire as the standard *** vapor pressure and decomposition temperature of ternary chloride salts were *** results showed that the vapor pressure of salt 1 was almost constant below 650℃ by ***,the TG results showed that the upper working temperature of salt 1 was 650℃ under the air *** addition,the ternary chloride salts after short-term cycling still exhibited excellent thermal properties,which revealed that these good thermal properties make them have broad application prospects in high-temperature thermal energy storage systems.

关键词： chloride salts thermal energy storages thermal properties thermal stability

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numerical simulation of formaldehyde distribution characteristics in the high-speed train cabin

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Building Simulation 2024年第2期17卷 285-300页

作者： Fan Wu Hang Dong Chao Yu Hengkui Li Qingm.n cui Renze Xu Key Laboratory of Traffic Safety on Track Ministry of EducationSchool of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan410075China Joint International Research Laboratory of Key Technologies for Rail Traffic Safety ChangshaHunan410075China national&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle ChangshaHunan410075China School of Software Henan University of EngineeringZhengzhouHenan451191China

The global concern over indoor air pollution in public vehicles has grown *** a focus on enhancing passengers’comfort and health,this study endeavors to investigate the distribution characteristics of formaldehyde within a high-speed train cabin by employing a computational fluid dynamics(CFD)model which is experim.ntally validated in a real cabin *** research focuses on analyzing the impact of air supply modes,temperature,relative humidity,and fresh air change rate on the distribution and concentration of *** results dem.nstrate that the difference in average formaldehyde concentration between the two air supply modes is below 1.3%,but the top air supply mode leads to a higher accumulation of formaldehyde near the sidewalls,while the bottom air supply mode promotes a more uniform distribution of ***,the temperature,relative humidity,and fresh air change rate are the primary factors affecting formaldehyde concentration levels,but they have modest effects on formaldehyde’s distribution pattern within the *** the temperature and relative humidity increase,the changes in formaldehyde concentrations in response to variations in these factors become more ***,the formaldehyde concentration may surpass the standard limit of 0.10 mg/m^(3)if the fresh air change rate falls below 212 m^(3)/*** research provides a systematic approach and referenceable results for exploring formaldehyde pollution in high-speed train cabins.

关键词： indoor air pollution formaldehyde CFD simulation high-speed train ventilation

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Vanadium oxide nanospheres encapsulated in n-doped carbon nanofibers with morphology and defect dual-engineering toward advanced aqueous zinc-ion batteries

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Journal of Energy Chemistry 2024年第2期89卷 599-609,I0013页

作者： Yunfei Song Laiying Jing Rutian Wang Jiaxi cui mei Li Yunqiang Zhang School of materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353ShandongChina Institute of Fundam.ntal and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina

Vanadium-based electrodes are regarded as attractive cathode materials in aqueous zinc ion batteries(ZIBs)caused by their high capacity and unique layered ***,it is extremely challenging to acquire high electrochemical perform.nce owing to the limited electronic conductivity,sluggish ion kinetics,and severe volume expansion during the insertion/extraction process of Zn^(2+).Herein,a series of V_(2)O_(3)nanospheres embedded n-doped carbon nanofiber structures with various V_(2)O_(3)spherical morphologies(solid,core-shell,hollow)have been designed for the first time by an electrospinning technique followed thermal *** n-doped carbon nanofibers not only improve the electrical conductivity and the structural stability,but also provides encapsulating shells to prevent the vanadium dissolution and aggregation of V_(2)O_(3)***,the varied morphological structures of V_(2)O_(3)with abundant oxygen vacancies can alleviate the volume change and increase the Zn^(2+)***,the phase transition between V_(2)O_(3)and Zn_XV_(2)O_(5-m)·n H_(2)O in the cycling was also *** a result,the as-obtained composite delivers excellent long-term cycle stability and enhanced rate perform.nce for coin cells,which is also confirmed through density functional theory(DFT)*** assembled into flexible ZIBs,the sample still exhibits superior electrochemical perform.nce,which may afford new design concept for flexible cathode materials of ZIBs.

关键词： Aqueous zinc ion batteries Vanadium trioxide Oxygen vacancy Structure evolution Phase optimization

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niCoZn/C@melam.ne sponge-derived carbon composites with highperform.nce electromagnetic wave absorption

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International Journal of m.nerals,metallurgy and materials 2024年第10期31卷 2274-2286页

作者： Xiubo Xie Heshan Wang Hideo Kimura cui ni Wei Du Guanglei Wu School of Environm.ntal and material Engineering Yantai UniversityYantai 264005China Shandong Key Laboratory of Eco-Environm.ntal Science for the Yellow River Delta Shandong University of AeronauticsBinzhou 256603China Institute of materials for Energy and Environm.nt State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

nim.n/C@melam.ne sponge-derived carbon(mSDC)composites(m=Co,Fe,and mn)were prepared by a vacuum pump-ing solution method followed by carbonization.A large number of carbon nanotubes(CnTs)homogeneously attached to the surfaces of the three-dim.nsional cross-linked of the sponge-derived carbon in the niCoZn/C@mSDC composite,and CnTs were detected in the niFeZn/C@mSDC and nimnZn/C@mSDC ***_(3)ZnC_(0.7),ni_(3)Fe,and mnO in-situ formed in the niFeZn/C@mSDC and nimnZn/C@mSDC *** CnTs in the niCoZn/C@mSDC composite efficiently modulated its complex ***,the composite exhibited the best perform.nce am.ng the composites,with the m.nimum reflection loss(RL_(m.n))of-33.1 dB at 18 GHz and thickness of 1.4 *** bandwidth for RL of≤-10 dB was up to 5.04 GHz at the thickness of 1.7 mm and loading of 25wt%.The op-timized impedance matching,enhanced interfacial and dipole polarization,remarkable conduction loss,and multiple reflections and scat-tering of the incident microwaves improved the microwave absorption *** effects of Co,ni,and Fe on the phase and mor-phology provided an alternative way for developing highly efficient and broadband microwave absorbers.

关键词： microwave absorption carbon nanotube elem.nt substitution melam.ne sponge-derived carbon

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mnO_(2)-coated nanodiam.nd-driven photodynamic therapy for enhanced antitumor effect by addressing hypoxia and glutathione depletion

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Particuology 2024年第9期92卷 305-315页

作者： Jicheng cui Dongmei Zhang Hui Qiao Zeyu Yan Wenxia Zhang Yingqi Li Key Laboratory of Chemical Biology and molecular Engineering of m.nistry of Education Institute of Molecular ScienceShanxi UniversityTaiyuan030006China Taiyuan Central Hospital Taiyuan030009China School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan030006China

The generation of reactive oxygen species(ROS)at the tumor site to induce destruction is emerging as a novel strategy for cancer treatm.nt,which involves photodynamic therapy(PDT).nevertheless,tumors typically create a hypoxic environm.nt and are equipped with an endogenous antioxidant defense system that could potentially impede the efficiency of the therapeutic *** overcome these drawbacks,herein,a tumor microenvironm.nt-responsive the nD-PAA-CD-Ce6@mnO_(2)(nPCC@m)delivery system was fabricated by disulfide bond coupling chlorin e6(Ce6)to nanodiam.nd(nD)and further wrapped by mnO_(2)nanosheets to facilitate *** use of disulfide bond not only stabilizes Ce6 in the blood circulation to prevent premature leakage,but also destroys the antioxidant barrier of overexpressed glutathione(GSH)in tumor ***,the outer mnO_(2)was rapidly degraded by the endogenous hydrogen peroxide(H_(2)O_(2))in the acidic pH and GSH within the tumor cells,which leads to an abundance of O_(2)and while increases the level of 1O_(2)under laser *** results eventually broke the redox homeostasis and attenuate hypoxia,thereby inducing apoptosis and necrosis of tumor *** in vitro and in vivo biological effect has revealed a good biosafety profile and a high tumor suppression *** a novel nD-based system with tumor microenvironm.nt-modulating capability to elevate oxygen content and promote GSH consumption in tumor cells opens new opportunities for enhanced ROS treatm.nt paradigms.

关键词： nanodiam.nd Photodynamic Chlorin e6 mnO_(2) Tumor suppression

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