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Stabilization/solidification mechanisms of tin tailings and fuming slag-based geopolymers for different heavy metals

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 43-55页

作者： xian Zhou Zhengfu Zhang hui Yang School of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China Kunming Metallurgical Research Institute Co. Ltd.Kunming650031China

Tin mine tailings(TMT)and fuming slag(FS)contain many heavy metals(As,Cr,Cu,Zn and Mn)that cause severe pollution to the ***,geopolymers were prepared using TMT,FS and flue gas desulfurization gypsum(FGDG)to immobilize heavy metals,and their compressive strength and heavy metal leaching toxicity were *** was first determined that T4F5(TMT:FS=4:5)sample exhibited the highest compressive strength(7.83 MPa).T4F5 achieved 95%immobilization efficiency for As and Cr,and nearly 100%for Cu,Zn and Mn,showing good immobilization performance.A series of characterization analyses showed that heavy metal cations can balance the charge in the geopolymer and replace Al in the geopolymer structure to form covalent *** addition,about 2%–20%of heavy metal Fe was immobilized in hydration products,heavy metal hydroxides and non-bridging Si–O and Al–O coordination with silica-aluminate ***_(3)^(3−) was oxidized into AsO_(4)^(3−),which may form Ca–As or Fe–As ***_(2)O_(7)^(2−)was converted to CrO_(4)^(2−)under alkaline environment and then combined with OH−to form Cr(OH)3 ***^(2+)may react directly with dissolved silicate to form Mn_(2)SiO_(4) and also form Mn(OH)_(2) *** unstable Mn(OH)_(2) can be further oxidized to MnO_(2).The heavy metal cations were immobilized in the silicoaluminate lattice,while the anions tended to form insoluble *** results may benefit the industry and government for better handling of TMT,FS and solid wastes containing the abovementioned five heavy metals.

关键词： Heavy metals Cementitious materials Tin tailings Stabilization/solidification Redox

A Quantum-behaved Pigeon-Inspired Optimization approach to Explicit Nonlinear Model Predictive Controller for quadrotor

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International Journal of Intelligent Computing and Cybernetics 2018年第1期11卷 47-63页

作者： ning xian Zhilong Chen Science and Technology on Aircraft Control Laboratory Beihang University(BUAA)BeijingChina

Purpose–The purpose of this paper is to simplify the Explicit Nonlinear Model Predictive Controller(ENMPC)by linearizing the trajectory with Quantum-behaved Pigeon-Inspired Optimization(QPIO).Design/methodology/approach–The paper deduces the nonlinear model of the quadrotor and uses the ENMPC to track the *** the ENMPC has high demand for the state equation,the trajectory needed to be differentiated many *** the trajectory is complicate or discontinuous,QPIO is proposed to linearize the *** the linearized trajectory will be used in the ***–Applying the QPIO algorithm allows the unequal distance sample points to be acquired to linearize the *** with the equidistant linear interpolation,the linear interpolation error will be *** implications–Small-sized quadrotors were adopted in this research to simplify the *** model is supposed to be accurate and differentiable to meet the requirements of ***/value–Traditionally,the quadrotor model was usually linearized in the *** this paper,the quadrotormodel waskept nonlinear and the trajectorywill be *** sample points were utilized to linearize the *** this way,the authors can get a smaller interpolation *** method can also be applied to discrete systems to construct the interpolation for trajectory tracking.

关键词： Explicit Nonlinear Model Predictive Controller Linearized trajectory Quantum-behaved Pigeon-Inspired Optimization

EXPERIMENTAL RESEARCH OF FLOW STRUCTURE IN A GAS-SOLID CIRCULATING FLUIDIZED BED RISER BY PIV

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Journal of Hydrodynamics 2007年第6期19卷 712-719页

作者： SHI hui-xian Modem Agricultural Science and Engineering Institute Tongji University Shanghai 200092 China

Particle Imaging Velocimetry （PIV） techniques were applied to investigate the particle motion and cluster properties in a gas-solid two-phase flow in a circulating fluidized bed riser. Visual images and micro-structure of various clusters were captured. After the boundary of clusters was determined by the gray level threshold method, clusters were classified by the distance between particles and the shape and position of clusters. In addition, the process of clusters forming and breaking up was described, and the sizes of clusters were also obtained. With the Minimum Quadric Difference （MQD） cross-correlation algorithm suitable for high-density particles, the axial velocities of the particles were obtained in the dilute phase section. The features of particle motion were revealed by investigating statistically the magnitude and distribution of particle axial velocity in the radial direction. At most radial cross-sections, there exists a parabola-shaped distribution of upward axial velocity of particles, namely, the magnitude of axial velocity in the core region is higher than that near the wall region of the riser.

关键词： Particle Imaging Velocimetry (PIV) gas-solid two-phase flow Circulating Fluidized Bed (CFB) Minimum Quadric Difference (MQD)

Superconducting gap ratio from strange metal phase in the absence of quasiparticles

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Communications in Theoretical Physics 2021年第2期73卷 117-123页

作者： Wenhe Cai xian-hui Ge Depatment of Physics Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of High Temperature Superconductors Department of PhysicsShanghai UniversityShanghai 20444 China

A lttice model for strongly interacting electrons motivated by a rank-3 tensor model provides a tool for understanding the pairing mechanism of high-temperature *** Sachdev Ye Kitaev-like model describes the strange metal phase in the cuprate high temperature *** calculation indicates that the superconducting gap ratio in this model is higher than the ratio in the BCS theory due to the coupling term and the spin *** certain conditions,the ratio also agrees with the BCS *** results relate to the case of strong coupling,so it may pave the way to gaining insight into the cuprate high temperature superconductors.

关键词： holography and condensed matter physics superconducting gap ratio strange metal

Bioinformatics analysis of breast cancer bone metastasis related geneCXCR4

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Asian Pacific Journal of Tropical Medicine 2013年第9期6卷 732-738页

作者： Heng-Wei Zhang xian-Fu Sun Ya-ning He Jun-Tao Li Xu-hui Guo hui Liu Department of Breast Henan Cancer Hospital Affiliated Cancer Hospital of Zhengzhou University

Objective:To analyze breast cancer bone metastasis related ***:This research screened breast cancer bone metastasis related genes by high-flux gene ***:It was found that the expressions of 396 genes were different including 165 up-regulations and 231 *** expression of chemokine receptor CXCR4 was obviously upregulated in the tissue with breast cancer bone *** with the tissue without hone metastasis,there was significant difference,which indicated that CXCR4 played a vital role in breast cancer bone ***:The hioinformatics analysis of CXCR4 can provide a certain basis for the occurrence and diagnosis of breast cancer bone metastasis,target gene therapy and evaluation of prognosis.

关键词： Breast cancer bone metastasis CXCR4 Bioinformatics analysis

Research Progress on Artemisinin and Its Derivatives against Hematological Malignancies

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Chinese Journal of Integrative Medicine 2020年第12期26卷 947-955页

作者： LI Ying SHAN ning-ning SUI Xiao-hui Department of Hematology Shandong Provincial Hospital Affiliated to Shandong UniversityJinan(250021)China

Although current therapeutic methods against hematological malignancies are effective in the early stage,they usually lose their effectiveness because of the development of drug *** new drugs with significant therapeutic effects is one of the current research ***,an extract from the plant Artemisia annua Linne,and its derivatives have excellent antimalarial effects in clinical applications as well as excellent *** studies have documented that artemisinin and its derivatives(ARTs)also have significant effects against multiple types of tumours,including hematological *** review focuses on the latest research achievements of ARTs in the treatment of hematological malignancies as well as its mechanisms and future *** mechanisms of ARTs against different types of hematological malignancies mainly include cell cycle arrest,induction autophagy and apoptosis,inhibition of angiogenesis,production of reactive oxygen species,and induction of ***,the review also summarizes the anticancer effects of ARTs in many drug-resistant hematological malignancies and its synergistic effects with other drugs.

关键词： artemisinin artesunate dihydroartemisinin hematological malignancies review

Analytical solution for the time-fractional heat conduction equation in spherical coordinate system by the method of variable separation

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Acta Mechanica Sinica 2011年第6期27卷 994-1000页

作者： Ting-hui ning Xiao-Yun Jiang School of Mathematics Shandong University 250100 Jinan China

In this paper,using the fractional Fourier law,we obtain the fractional heat conduction equation with a time-fractional derivative in the spherical coordinate *** method of variable separation is used to solve the timefractional heat conduction *** Caputo fractional derivative of the order 0 〈 α≤ 1 is *** solution is presented in terms of the Mittag-Leffler *** results are illustrated graphically for various values of fractional derivative.

关键词： Fractional Fourier law Fractional heat conduction equation - Spherical coordinate system - The separation of variables Mittag-Leffler function

Characteristics of alumina particles in dispersion-strengthened copper alloys

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1115-1119页

作者： Xue-hui Zhang Xiao-xian Li School of Materials Science and Engineering Jiangxi University of Science and Technology School of Metallurgical and Chemical Engineering Jiangxi University of Science and Technology

Two types of alumina dispersion-strengthened copper（ADSC） alloys were fabricated by a novel in-situ reactive synthesis（IRS） and a traditional internal oxidation（IO） process. The features of alumina dispersoids in these ADSC alloys were investigated by X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. It is found that nano-sized γ-Al2O3 particles of approximately 10 nm in diameter are homogeneously distributed in the IRS-ADSC composites. Meanwhile, larger-sized, mixed crystal structure alumina with rod-shaped morphology is embedded in the IO-ADSC alloy. The IRS-ADSC composites can obtain better mechanical and physical properties than the IO-ADSC composites; the tensile strength of the IRS-ADSC alloy can reach 570 MPa at room temperature, its electrical conductivity is 85% IACS, and the Rockwell hardness can reach 86 HRB.

关键词： metallic matrix composites alumina copper in-situ reactive synthesis internal oxidation

Effects of alloying elements X( X = Zr,V,Cr,Mn,Mo,W,Nb,Y) on ferrite/TiC heterogeneous nucleation interface: first-principles study

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Journal of Iron and Steel Research International 2017年第3期24卷 328-334页

作者： hui-hui Xiong Heng-hua Zhang hui-ning Zhang Yang Zhou State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai University School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology

The segregation behavior of alloying elements X（ X = Zr,V,Cr,Mn,Mo,W,Nb,Y） on the ferrite（ 100） /TiC（ 100） interface has been investigated using first principles method,and the work of separation and interface energy of ferrite / TiC interfaces alloyed by these elements were also analyzed. The results indicated that all these alloying additives except Y were thermodynamically favorable because of the negative segregation energy,showing that they have the tendency to segregate to the ferrite / TiC interface. When the Fe atom in the ferrite /TiC interface is replaced by Y,Zr,or Nb,the adhesive strength of the interface will be weakened due to the lower separation work,larger interfacial energy,and weaker electron effects. However,the introduction of Cr,Mo,W,Mn and V will improve the stability of the ferrite / TiC interface through strong interaction between these elements and C,and Cr-doped interface is the most stable structure. Therefore,the Cr,Mo,W,Mn and V in ferrite side of the interface can effectively promote ferrite heterogeneous nucleation on TiC surface to form fine ferrite grain.

关键词： Fe/TiC interface Alloying element Heterogeneous nucleation Segregation First-principles