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Combustion synthesis and characterizations of Sm2O3 doped zirconolite-rich waste forms with CuO as oxidant

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Journal of Rare Earths 2019年第12期37卷 1359-1365页

作者： Kuibao Zhang Dan Yin zongsheng he Jiali Xue Wenwen Zhao Haibin Zhang State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety Southwest University of Science and TechnologyMianyang 62W10China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

Zirconolite is one of the most important matrix materials for nuclear waste *** this study,Sm was employed as the surrogate of trivalent ***-doped zirconolite-rich waste forms were readily prepared by combustion synthesis(CS)using CuO as the *** different schemes with or without Al2O3 as the charge compensator were carried out *** results demonstrate that Al2O3 addition results in complex phase *** the other hand,the samples without Al2O3 addition show desirable products of zirconolite and *** EDX analysis shows that Sm is concurrently incorporated into the Ca and Zr sites of zirconolite,which transforms to pyrochlore structure with high Sm2O3 *** aqueous durability of representative Sm-doped sample(Sm-0.6)was *** 42 days normalized leaching rate of Sm is as low as 6.41×10-7 g/(m2 d),which exhibits high durability of Sm-doped sample.

关键词： Combustion synthesis Sm2O3 Zirconolite Pyrochlore Aqueous durability Rare earths

Solid-state reaction synthesis and chemical stability studies in Nd-doped zirconolite-rich ceramics

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Journal of Rare Earths 2018年第5期36卷 492-498页

作者： Dan Yin Kuibao Zhang Le Peng zongsheng he Yuan Liu Haibin Zhang Xirui Lu State Key Laboratory Cultivation Base for Nonmetal Composite and Foundational Materials Southwest University of Science and Technology Mianyang 621010 China National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety Southwest University of Science and Technology Mianyang 621010 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

In this study, Nd-bearing zirconolite-rich ceramics were prepared by solid-state reaction process using CaF2,ZrO2, Ti,TiO2, Fe2 O3 and Nd2O3 as the raw materials. Neodymium was used as trivalent actinide surrogate and designed to substitute the Ca and Zr sites of zirconolite with general stoichiometry of Ca1-xZr1-xNd2 xTi2O7（0≤x≤0.3）. Density of Fe-Nd-O sample reaches a maximum value of 4.13 g/cm^2 after being sintered at 1325 ℃ for 42 h. Three major phases, namely zirconolite, perovskite and pseudobrookite, are observed in all these samples. The EDX result shows that Nd2O3 can be successfully incorporated into the lattice structure of the prepared zirconolite-rich minerals and replace the Ca sites of zirconolite and perovskite with Fe3＋ as the charge-compensating ion. Furthermore, the thermal conductivities are all in the range of 1.51-1.67 W/（m·K）. The normalized elemental leaching rates of Ca and Nd in the Fe-Nd-0.2 sample keep in low values of 6.20 × 10^-2 and 4.86 × 10^-4 g/（m^2·d） after 42 d.

关键词： Zirconolite Perovskite Pseudobrookite Nd2O3 Chemical stability Rare earths

Self-propagating high-temperature synthesis of ZrO_2 incorporated Gd_2Ti_2O_7 pyrochlore

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Journal of Advanced Ceramics 2018年第1期7卷 41-49页

作者： Le PENG Kuibao ZHANG zongsheng he Dan YIN Jiali XUE Chen XU Haibin ZHANG State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials Southwest University of Science and Technology Science and Technology on Surface Physics and Chemistry Laboratory China Academy of Engineering Physics Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics

In this research, Zr-doped Gd_2Ti_2O_7 pyrochlores, with the composition of Gd_2(Ti_(1-x)Zr_x)_2O_7, were firstly synthesized by self-propagating high-temperature synthesis plus quick pressing(SHS/QP) using CuO as the oxidant and Ti as the reductant. To improve the radiation resistance of titanate–pyrochlore, up to 35 at% Zr was incorporated to substitute the Ti site of Gd_2Ti_2O_7 pyrochlore(Gd_2(Ti_(0.75)Zr_(0.35))_2O_7). XRD and SEM microstructural characterizations showed the formation of a composite ceramic with the major pyrochlore phase and the minor Cu phase. The generated temperature of samples decreased from 1702to 1011 ℃ with increasing Zr content. The effects of sintering temperature and pressure time on phase composition and microstructure were systematically studied. Besides, the influence of thermal transmission on the whole combustion process was also explored. The pyrochlore-based waste form possessed high bulk density of 6.25 g/cm^3 and Vickers hardness of 10.81 GPa. The MCC-1 leaching test showed the normalized elemental leaching rates(42d) of Cu, Gd, and Zr are 1.27×10^(-2), 1.33×10^(-3), and 8.44×10^(-7)g·m^(-2)·d^(-1), respectively.

关键词： self-propagating high-temperature synthesis plus quick pressing (SHS/QP) pyrochlore thermal transmission waste form aqueous leachability

Model-free Speed Control of Single-phase Flux Switching Motor with an Asymmetrical Rotor

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CES Transactions on Electrical Machines and Systems 2024年第3期8卷 255-263页

作者： zongsheng Zhang Congcong Guo School of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China Qingdao Technical College Qingdao 266555China

This paper proposes and implements a model-free open-loop iterative learning control(ILC)strategy to realize the speed control of the single-phase flux switching motor(FSM)with an asymmetrical *** on the proposed winding control method,the asymmetrical rotor enables the motor to generate continuous positive torque for positive rotation,and relatively small resistance torque for negative *** initial iteration coefficient and variable iteration coefficient optimized scheme was proposed based on the characteristics of the hardware circuit,thereby forming the model-free strategy.A series of prototype experiments was carried *** results verify the effectiveness and practicability of the proposed ILC strategy.

关键词： Asymmetrical rotor Model-free iterative control Prototype experiments Single-phase flux switching motor

A Design of Modular Interior Ferrite Magnet Fluxswitching Linear Motor for Track Transport

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CES Transactions on Electrical Machines and Systems 2024年第3期8卷 284-294页

作者： zongsheng Zhang Hao Wang Hong Chen College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

A novel topology of modular ferrite magnet fluxswitching linear motor(FMFSLM)use for track transport is presented in this paper,which enables more ferrite magnets to be inserted into the primary iron *** motor has a significant low-cost advantage in long-distance linear *** proposed FMFSLM’s structure and working principle were ***,the thrust force expression of the motor was *** thrust force components triggering thrust force ripple were investigated,and their expressions can be obtained according to the inductances’Fourier series ***,the relationship between the harmonics of thrust force and that of self-and mutual inductances was revealed *** on the relationship,a skewed secondary should be practical to reduce the thrust force ***,the effect of employing a skewed secondary to the proposed FMFSLM was investigated,and an optimized skewing span distance was *** element analysis(FEA)was conducted to validate the exactness of the theoretical *** simulation results indicate that the strategy of suppressing thrust force ripple has a significant ***,the motor maintains a good efficiency *** results of the prototype experiment are in good agreement with FEAs,which further verifies the proposed modular interior FMFSLM’s practicability.

关键词： Ferrite magnet flux-switching linear motor(FMFSLM) Detent force Resistance force Force ripple Skewed secondary

Leader-Following Consensus of Multi-Agent Systems via Fully Distributed Event-Based Control

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Journal of Shanghai Jiaotong university(Science) 2024年第4期29卷 640-645页

作者： GENG zongsheng ZHAO Dongdong ZHOU Xingwen YAN Lei YAN Shi School of Information Science and Engineering Lanzhou UniversityLanzhou730000China Engineering Research Center of Open-Source Software and Real-Time Systems of Ministry of Education Lanzhou UniversityLanzhou730000China

This paper aims to study the leader-following consensus of linear multi-agent systems on undirected ***,we construct an adaptive event-based protocol that can be implemented in a fully distributed way by using only local relative *** protocol is also resource-friendly as it will be updated only when the agent violates the designed event-triggering function.A sufficient condition is proposed for the leader-following consensus of linear multi-agent systems based on the Lyapunov approach,and the Zeno-behavior is ***,two numerical examples are provided to illustrate the effectiveness of the theoretical results.

关键词： consensus multi-agent systems event-based control adaptive control fully distributed protocol

Honeycomb-like biochar framework coupled with Fe_(3)O_(4)/FeS nanoparticles as efficient heterogeneous Fenton catalyst for phenol degradation

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Journal of Environmental Sciences 2024年第2期136卷 390-399页

作者： Aihua Cheng Yi he Xiaohe Liu Chi he Department of Environmental Engineering College of Geology and EnvironmentXi’an University of Science and TechnologyXi’an 710054China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for VOCs Pollution Control Material and Technology University of Chinese Academy of SciencesBeijing 101408China

Achieving an efficient and stable heterogeneous Fenton reaction over a wide pH range is of great significance for wastewater ***,a pollen-derived biochar catalyst with a unique honeycomb-like structure,coupled with the dispersion of magnetic Fe_(3)O_(4)/FeS(Fe/S)nanoparticles,was synthesized by simple impregnation precursor,followed by *** prepared Fe/S-biochar catalyst demonstrated outstanding phenol degradation efficiency across a wide pH range,with 98%of which eliminated even under neutral conditions(pH 7.0).The high catalytic activity was due to the multilevel porous structure of pollenderived biochar provided enough active sites and allowed for better electron transfer,then increases oxidation ability to promote the ***,the acid microenvironment formed by SO_(4)^(2-)group from Fe/S composite extended the pH range for Fenton reaction,and S^(2-)facilitated the conversion of≡Fe^(3+)to≡Fe^(2+),resulting in remarkable degradation ***,biochar can effectively promote cycling stability by limiting Fe *** work may provide a general strategy for designing 3D framework biochar-based Fe/S catalysts with excellent performance for heterogeneous Fenton reactions.

关键词： Biomass Biochar Fenton reaction Fe_(3)O_(4)/FeS(Fe/S) Phenol degradation

A theory for three-dimensional response of micropolar plates

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1403-1414页

作者： Dianwu HUANG Linghui he College of Civil Engineering and Architectural Jiaxing UniversityJiaxing 314001Zhejiang ProvinceChina Department of Modern Mechanics and State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

Through combined applications of the transfer-matrix method and asymptotic expansion technique,we formulate a theory to predict the three-dimensional response of micropolar *** ad hoc assumptions regarding through-thickness assumptions of the field variables are made,and the governing equations are two-dimensional,with the displacements and microrotations of the mid-plane as the *** the deformation of the mid-plane is solved,a three-dimensional micropolar elastic field within the plate is generated,which is exact up to the second order except in the boundary region close to the plate *** an illustrative example,the bending of a clamped infinitely long plate caused by a uniformly distributed transverse force is analyzed and discussed in detail.

关键词： micropolar plate transfer-matrix asymptotic expansion three-dimensional response

H-and J-aggregation of conjugated small molecules in organic solar cells

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Journal of Energy Chemistry 2024年第6期93卷 174-192,I0005页

作者： Qiaoqiao Zhao Feng he State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353ShangdongChina Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

As H-and J-aggregation receive more and more attention in the research of organic solar cells(OSCs),especially in small molecular systems,deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OSC *** this end,this review is ***,the review firstly introduced the basic information about H-and J-aggregation of conjugated small molecules in ***,the characteristics of H-and J-aggregation and the methods to identify them were ***,it reviewed the research progress of H-and J-aggregation of conjugated small molecules in OSCs,including the factors influencing H-and J-aggregation in thin film and the effects of H-and J-aggregation on OPV performance.

关键词： H-aggregation J-aggregation Organic solar cells Small molecules Efficiency Stability