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Pre-reduction of wO_(3)-Co_(3)O_(4)by h_(2)-C_(2)h_4 in a fluidized bed

Chinese Journal of Chemical Engineering 2024年第2期66卷 273-284页

作者： huijun Shang hengli Li weijun Li Feng pan Zhan Du State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China College of Chemical Engineering Nanjing Technology UniversityNanjing 211816China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Chinalco Environmental Protection and Energy Conservation Group Co. Ltd.Xiong’an 071700China

In order to avoid the formation ofηphase(w_(6)Co_(6)C or w_(3)Co_(3)C)that adversely affects the sintering process and its products in the preparation process of ultra-fine wC-Co powder,a technical route of prereduction of wO_(3)-Co_(3)O_(4)to wO_(2)-Co and then deep reduction carbonization to wC-Co powder has been *** study mainly investigates the influence of gas partial pressure on the pre-reduction process of wO_(3)-Co_(3)O_(4)under a mixed atmosphere of h_(2)-C_(2)h_(4)-Ar at 600℃and establishes the kinetic equations of pre-reduction and carbon *** results indicate that increasing the partial pressure of hydrogen is conducive to the rapid and complete conversion of wO_(3) to wO_(2).high carbon content can be generated by the deposition of C_(2)h_(4),and it hinders the diffusion of the reducing gas;wO_(3)still cannot be completely reduced to wO_(2)as the partial pressure of C_(2)h_(4) increases to 60%.For the carbon evolution of C_(2)h_(4),the carbon amount is positively related to the h_(2)partial pressure,but it shows the highest amount and evolution rate when the ethylene partial pressure is 20%.Based on the reduction rate curves of wO_(3) and carbon evolution rate curves of C_(2)h_(4),the rate equations of pre-reduction and carbon evolution of wO_(3)-Co_(3)O_(4)system at 600℃are *** pre-reduction reaction belongs to the first-order reaction,and its equation is expressed as follows:r=-(dw_(wO_(3)))/dt=(9±0.15)×10^(-2)×P_(h_(2))^(0.44)P_(C_(2)h_(4))&(0.57)The carbon deposition rate equation of C_(2)h_(4) can be expressed as follows:r=-(dc_C)/dt=r_f-r_b≌7.35×10^(-2)×P_(C_(2)h_(4))^(0.31)

关键词： Fluidization wO_(3)-Co_(3)O_(4) Reduction Carbon deposition Rate equation

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Deep insight of unique phase transition behaviors and mechanism in Zr_(2)Co-h isotope system with ultra-low equilibrium pressure

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Rare Metals 2024年第1期43卷 212-224页

作者： Yang Liu pan-pan Zhou Xue-Zhang Xiao Jia-Cheng Qi Jia-Peng Bi Tiao Ying Xing-wen Feng Yan Shi wen-hua Luo Li-Xin Chen State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310013China

Efficient capture,safe storage and release of tritium from the international thermonuclear experimental reactor(ITER) reaction exhaust gas is a perplexing problem,and the development of an efficient tritium-getter material with ultra-low hydrogenation equilibrium pressure is considered as a reliable *** this work,Zr_(2)Co alloy was selected as a tritium-getter material and prepared through induction levitation *** performance test results show that Zr_(2)Co exhibits an ultra-low hydrogenation equilibrium pressure of 3.22 × 10^(-6) Pa at 25℃ and excellent hydriding kinetics under a low hydrogen pressure of 0.005 ***,unique phase transition behaviors were presented in Zr_(2)Co-h ***,Zr_(2)Coh_(5) formed by Zr_(2)Co hydrogenated at room temperature is initially decomposed into Zrh_(2) and ZrCoh_(3) at200 ℃.with the temperature increasing to 350 ℃,ZrCoh_(3)is dehydrogenated to ZrCo,and then ZrCo further reacts with Zrh_(2) at 650 ℃ to reform Zr_(2)Co and *** the staged phase transition pathways during dehydrogenation,the decomposition of Zr_(2)Coh_(5) occurs preferentially,which is well accordance with both the smallest reaction energy barrier and the maximum reaction spontaneity that are determined respectively from kinetics activation energy and thermodynamics Gibbs free ***,first principles calculation results indicate that the stronger binding of hydrogen in interstitial environments of ZrCoh_(3)and Zrh_(2) triggers the hydrogen-stabilized phase transformation of Zr_(2)Coh_(5).The unique phase transition mechanisms in Zr_(2)Co-h system can shed light on the further exploration and regulation of analogous staged phase transition of hydrogen storage materials.

关键词： Zr_(2)Co alloy Tritium-getter materials Ultralow equilibrium hydrogen pressure Phase transition mechanism

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Investigation into the roles of interfacial h_(2)O structure in catalytic oxidation of hChO and CO over CuMnO_(2) catalysts

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Journal of Environmental Sciences 2024年第3期137卷 310-320页

作者： Chunyan Ma Jushuang pan Cheng Chen Yuanyuan Dong Feng Yao Fengbang wang Maoyong Song Key Laboratory of Environmental Nanotechnology and health Effects Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China No.52 Institute of China North Industries Group Yantai Branch Co.Ltd. Yantai 264000China

The rapid deactivation of cost-effective MnO_(2)-based catalysts in humid air limits their application in practice,and the identification of the role of water in an oxidation process is significant for developing water-resistant MnO_(2)-based ***,CuMnO_(2)showed a20.3%hChO conversion in 10 hr at room temperature in humid air with relative humidity of 40%,but deactivated in 3 hr in dry *** excellent activity and stability of hChO oxidation in humid air were attributed to the positive effect of h_(2)O on hChO oxidation to the h_(2)O-hOCh_(2)Oh supermolecule assemblies via hydrogen bonds formed on CuMnO_(2).h_(2)O-hOCh_(2)Oh supermolecule assemblies tend to be oxidized to carbonate,which is further oxidized to CO_(2).Furthermore,CuMnO_(2)exhibited a much poorer activity of CO oxidation in humid air,but the CO conversion was still 100%in 10 hr in dry air.h_(2)O showed a competitive adsorption effect to CO on CuMnO_(2).CuMnO_(2)could be applied in hChO elimination in humid air and CO elimination in dry air.

关键词： h_(2)O-hOCh_(2)Oh supermolecule hChO oxidation humid air CuMnO_(2) CO oxidation

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The quasi-Gramian solution of a non-commutative extension of the higher-order nonlinear Schr?dinger equation

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Communications in Theoretical Physics 2024年第3期76卷 51-61页

作者： h w A Riaz J Lin Department of Physics Zhejiang Normal UniversityJinhua 321004China

The nonlinear Schr?dinger(NLS)equation,which incorporates higher-order dispersive terms,is widely employed in the theoretical analysis of various physical *** this study,we explore the non-commutative extension of the higher-order NLS *** treat real or complex-valued functions,such as g_(1)=g_(1)(x,t)and g_(2)=g_(2)(x,t)as non-commutative,and employ the Lax pair associated with the evolution equation,as in the commutation *** derive the quasi-Gramian solution of the system by employing a binary Darboux *** soliton solutions are presented explicitly within the framework of *** visually understand the dynamics and solutions in the given example,we also provide simulations illustrating the associated ***,the solution can be used to study the stability of plane waves and to understand the generation of periodic patterns within the context of modulational instability.

关键词： integrable systems Darboux transformation solitons

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A FRET-Based Ratiometric h_(2)S Sensor for Sensitive Optical Molecular Imaging in Second Near-Infrared window

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Research 2024年第3期2023卷 671-684页

作者： Shan Lei Kejia Jiang Chenqing Zhang wei Sun Yuantao pan Dong wang Peng huang Jing Lin Marshall Laboratory of Biomedical Engineering International Cancer CenterShenzhen Key Laboratory of Tumor Visualization Molecular MedicineLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Medical SchoolShenzhen UniversityShenzhen 518055China. Center for AIE Research College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China.

Second near-infrared(NIR-II)window optical molecular imaging kicks off a new revolution in high-quality imaging in vivo,but always suffers from the hurdles of inevitable tissue autofluorescence background and NIR-II probe ***,we prepare a Förster resonance energy transfer-based ratiometric NIR-II window hydrogen sulfide(h_(2)S)sensor through the combination of an h_(2)S-responsive NIR-II cyanine dye(acceptor,LET-1055)and an h_(2)S-inert rhodamine hybrid polymethine dye(donor,Rh930).This sensor not only exhibits high sensitivity and selectivity,but also shows rapid reaction kinetics(~20 min)and relatively low limit of detection(~96 nM)toward h_(2)S,allowing in vivo ratiometric NIR-II fluorescence imaging of orthotopic liver and colon tumors and visualization of the drug-induced hepatic h_(2)S *** findings provide the potential for advancing the feasibility of NIR-II activity-based sensing for in vivo clinical diagnosis.

关键词： h_ Infrared kinetics

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Electricity-driven enantioselective cross-dehydrogenative coupling of two C(sp^(3))-h bonds enabled by organocatalysis

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Chinese Chemical Letters 2024年第9期35卷 130-134页

作者： Yuemin Chen Yunqi wu Guoao wang Feihu Cui haitao Tang Yingming pan State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical Sciences of Guangxi Normal UniversityGuilin 541004China

An efficient and scalable electrochemical asymmetric protocol with metal-free catalysts and even without additional oxidants for the cross-dehydrogenative coupling reaction(CDC)of two C(sp^(3))-h bonds is reported.A series of aldehydes including natural products and various substrates containing C(sp^(3))-h bonds including xanthenes,acridines,cycloheptatrienes and even diarylmethane have been shown to undergo asymmetric CDC to afford a series of carbon-carbon bond coupling products with up to 94%yield and 98%*** studies such as radical clock experiment suggest that the reaction proceeds via nucleophilic attack by enamine under electrochemical conditions.

关键词： Aminocatalysis Electrochemistry Asymmetric catalysis CDC of C(sp^(3))-h bonds

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Global Tangentially Analytical Solutions of the 3D Axially Symmetric Prandtl Equations

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Chinese Annals of Mathematics,Series B 2024年第4期45卷 573-596页

作者： Xinghong pan Chaojiang XU School of Mathematics and Key Laboratory of MIIT Nanjing University of Aeronautics and Astronautics Laboratoire de Mathématiques Rapha?l Salem UMR 6085 CNRSUniversité de Rouen Normandie

In this paper,the authors will prove the global existence of solutions to the three dimensional axially symmetric Prandtl boundary layer equations with small initial data,which lies in h1Sobolev space with respect to the normal variable and is analytical with respect to the tangential *** main novelty of this paper relies on careful constructions of a tangentially weighted analytic energy functional and a specially designed good unknown for the reformulated *** result extends that of Paicu-Zhang in[Paicu,*** Zhang,P.,Global existence and the decay of solutions to the Prandtl system with small analytic data,***.,241（1）,2021,403–446].from the two dimensional case to the three dimensional axially symmetric case,but the method used here is a direct energy estimates rather than Fourier analysis techniques applied there.

关键词： Axially symmetric Global existence Prandtl equations Tangentially analytical solutions

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Assessment of Dependent Performance Shaping Factors in SPAR-h Based on Pearson Correlation Coefficient

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1813-1826页

作者： Xiaoyan Su Shuwen Shang Zhihui Xu hong Qian Xiaolei pan School of Automation Engineering Shanghai University of Electric PowerShanghai 200090China State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China

with the improvement of equipment reliability,human factors have become the most uncertain part in the *** standardized Plant Analysis of Risk-human Reliability Analysis(SPAR-h)method is a reliable method in the field of human reliability analysis(hRA)to evaluate human reliability and assess risk in large complex ***,the classical SPAR-h method does not consider the dependencies among performance shaping factors(PSFs),whichmay cause overestimation or underestimation of the risk of the actual *** address this issue,this paper proposes a new method to deal with the dependencies among PSFs in SPAR-h based on the Pearson correlation ***,the dependence between every two PSFs is measured by the Pearson correlation ***,the weights of the PSFs are obtained by considering the total dependence ***,PSFs’multipliers are modified based on the weights of corresponding PSFs,and then used in the calculating of human error probability(hEP).A case study is used to illustrate the procedure and effectiveness of the proposed method.

关键词： Reliability evaluation human reliability analysis SPAR-h performance shaping factors dependence pearson correlation analysis

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Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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Journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： h.T.Jeong S.w.Lee w.J.Kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the hCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth

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Editorial for Multiscale&Multifield Coupling in Geomechanics

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1919-1921页

作者： Min wang Pengzhi pan Andrew h.C.Chan Y.T.Feng T-3 Fluid Dynamics and Solid Mechanics Theoretical DivisionLos Alamos National LaboratoryNew MexicoUSA Institute of Rock and Soil Mechanics Chinese Academy of SciencesWuhanChina School of Engineering University of TasmaniaTasmaniaAustralia College of Engineering Swansea UniversityWalesUK

we are delighted to serve as guest editors for this special issue in the Journal of Rock Mechanics and Geotechnical *** purpose of this special issue is dedicated to gathering the latest research work on Multiscale&Multifield Coupling in Geomechanics,where we delve into the intricate interplay of various fields and scales that govern the behavior of *** total,30 manuscripts from USA,China,UK,Germany,Canada,India and United Arab Emirates are selected to be included in this issue.

关键词： materials. gathering mechanics

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