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Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1069-1079页

作者： Jian-zhi Sun Jian-kang wen Bo-wei Chen Biao Wu National Engineering Laboratory of Biohydrometallurgy GRINM Group Corporation Limited

To inhibit the dissolution of Mg^2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg^2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg^2+ from olivine and serpentine was temperature, followed by p H and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg^2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.

关键词： olivine serpentine high-magnesium nickel sulfide ore bioleaching shrinking core model elevated pH

Phonon and Electron Densities of States in Amorphous Fe_(90-x)Co_(x)Zr_(10)Alloys

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Chinese Physics Letters 1995年第1期12卷 30-33页

作者： LU Zhichao XIANYU ze LI Jizhou kang Jian YE Chuntang LI Zhuqi SHEN Baogen Department of Physics Northeastern UniversityShenyang 110006 China Institute of Atomic Energy Beijing 102413 Institute of Physics Academia SinicaBeijing 100080

The generalized phonon density of states(PDOS)and the valence electron density of states(EDOS)of the amorphous Fe_(90-x)Co_(x)Zr_(10)(x=4,10 and 40)alloys were measured at the room temperature by inelastic neutron-scattering and x-ray photoemission spectroscopy,*** results show that the stronger the Invar effect,the softer is the PDOS in the low-energy region and the larger is the EDOS at the Fermi energy *** enhancement of electron-phonon interaction was suggested to explain the low-energy phonon softening observed in Invar alloys.

关键词： Invar softening alloys

Organization-Driven Business Process Configurable Modeling for Spatial Variability

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China Communications 2021年第11期18卷 229-242页

作者： Guosheng kang Liqing Yang Liang Zhang Jianxun Liu Yiping wen Hunan Provincial Key Lab.for Services Computing and Novel Software Technology Hunan University of Science and TechnologyXiangtan 411201China School of Computer Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Computer Science Fudan UniversityShanghai 201203China

Nowadays,enterprises need to continually adjust their business processes to adapt to the changes of business environments,especially when one business needs to be deployed in different application scenarios,which is called spatial variability in this *** the field of BPM(Business Process Management),configurable business process models have demonstrated their effectiveness in aspects of process modeling and model ***,we found that the existing techniques lead to complex configurable models,and are inadequate for model reuse especially for the spatial variability issue because they neglect the root impact of organizations on control flow.S-BPM(Subject-oriented Business Process Management)models provide a solid foundation for dealing with complex applications and help to bridge the gap between business and IT for process *** this paper,we propose an organization-driven business process configurable modeling approach for spatial variability by integrating both restriction and extension operations based on the S-BPM paradigm,in which business objects are also *** approach is validated with a general business process developed for the Real Estate Administration(REA)in a certain province of *** resulting configurable modeling framework can express the heterogeneous activity sequences for one business and has the potential to generate process models for uncertain environments in a new organization structure.

关键词： S-BPM configurable modeling organization-driven spatial variability business objects services

One-step synthesis of hollow PEI-NaBiF4:Yb^3+/Er^3+upconversion nanoparticles for water-responsive luminescent probe

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Journal of Rare Earths 2020年第4期38卷 362-368页

作者： Zaifa Pan Yingting wen Tao Wang Kai Wang Yuanjie Teng kang Shao College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310000China

Novel PEI-modified NaBiF4:Yb3+/Er3+upconversion nanoparticles(UCNPs)with hollow structure were prepared by a surface modification free one-step solvothermal method and applied as a luminescent probe to determinate water content in organic ***,SEM and HRTEM results demonstrate that the obtained PEI-NaBiF4:Yb3+/Er3+UCNPs are pure hexagonal phase with uniform *** successful modification of PEI on the UCNPs surface was evidenced byζ-potential test,XPS and TG *** synthesized UCNPs are disintegrated into smaller nanoparticles in the presence of water and thus result in a surface quenching effect,which show the features of 0-100%wide range water response in various organic *** sensing performance towards real samples was validated by the water content determination in beer,rum and white ***,the luminescence intensity variation of the PEI-modified NaBiF4:Yb3+/Er3+enable the test visualization and ease of portability.

关键词： Luminescent probe Upconversion nanoparticles Water detection Organic solvents Rare earths

Roles of metal element substitutions from the bimetallic solid state electrolytes in lithium batteries

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Particuology 2022年第6期20卷 51-71页

作者： wen Yu Nanping Deng Lin Tang Kewei Cheng Bowen Cheng Weimin kang State Key Laboratory of Separation Membranes and Membrane Processes National Center for International Joint Research on Separation MembranesTiangong UniversityTianjin 300387China School of Textile Science and Engineering Tiangong UniversityTianjin 300387China

All-solid-state lithium batteries(ASSLBs),receiving extensive attentions and studies,exhibit better safety,environmental friendliness,stability,wider electrochemical stability window and higher energy density than traditionally liquid lithium *** a variety of inorganic materials,with highly replaceable,the non-lithium metal elements emerge in endlessly and affect performances in diversiform *** to facile preparation,convertible structures and excellent properties,the lithium-containing bimetallic granular materials are often applied as important components of electrolytes in lithium *** this review,in terms of the properties of substituted elements,changing crystal structures,increasing vacancies or defects and improving the interfacial conductions,the roles of metal element substitutions of inorganic particles on the improvement of solid-state electrolytes are *** the applications of substituted strategies in ASSLBs as the host of inorganic particles electrolytes and as fillers or modifications for composite electrolytes are also investigated and *** also summarizes the current concerns and obstacles that need to be broken through,as well as provides a basis guide for the selection and optimization of inorganic particles.

关键词： Metal element substitutions Bimetallic inorganic particles Solid-state electrolytes All-solid-state lithium batteries Mechanisms

A ratiometric fluorescent nanoprobe based on ZIF-8@AuNCs-Tb for visual detection of 2,6-pyridinedicarboxylic acid

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Journal of Rare Earths 2022年第8期40卷 1165-1172页

作者： kang Shao Siyu wen Mengyuan Zhang Jing Wang Shiyi Ye Zaifa Pan College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Institute of Animal Husbandry and Veterinary Science Zhejiang Academy of Agricultural SciencesHangzhou 310002China College of Life Science Yangtze UniversityJingzhou 434023China

The rapid and sensitive detection of 2,6-pyridinedicarboxylic acid(DPA),one of the main biomarkers of Bacillus anthracis,is of great significance for the screening and diagnosing of ***,a ratiometric fluorescent nanoprobe based on zeolite imidazolate framework-8(ZIF-8)@AuNCs-Tb was constructed by embedding both gold nanoclusters(AuNCs)and terbium ions(Tb^(3+))into ZIF-8 for highresolution visual detection of *** to the aggregation induced emission enhancement(AIE)effect,AuNCs embedded in ZIF-8 emit a strong orange *** Tb^(3+)is coordinated with DPA added to the nanoprobe,it will emit a strong green fluorescence owing to the antenna *** results reveal that ZIF-8@AuNCs-Tb nanoprobe can detect DPA effectively with a good linear relationship in the range of 40-200 and 200-1000μmol/L,the limit of detection(LOD)is estimated at 1.8μmol/L(3σ/k).The proposed nanoprobe shows a remarkable selectivity for DPA and is quite easy to realize visualization based on the fluorescent color changing from orange to green,which has potential application in clinical *** feasibility of this method was verified by standard addition recovery experiments simulating the release of DPA from spores.

关键词： Terbium ions Ratiometric fluorcscent nanoprobe Visual detection Gold nanoclusters zeolite imidazolate framework-8 Rare earths

Advances in preparation methods and mechanism analysis of layered double hydroxide for lithium-ion batteries and lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第7期30卷 472-499页

作者： wen Yu Nanping Deng Kewei Cheng Jing Yan Bowen Cheng Weimin kang State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes Tiangong UniversityTianjin 300387China School of Textile Science and Engineering Tiangong UniversityTianjin 300387China

Lithium-ion(Li-ion) battery and lithium-sulfur(Li-S) battery have attracted significant attention as promising components for large-scale energy storage because of high theoretical capacity of Li,excellent energy density or environmental friendness for two kinds of ***,there still exist some respective obstacles for commercial applications,such as limited theoretical capacity,high cost and low conductivity of Li-ion cells or shuttle effect of lithium polysulfides of Li-S *** typical twodimensional materials,layered double hydroxides(LDHs) exhibit excellent potential in the field of energy storage due to facile tunability of composition,structure and morphology as well as convenient composite and strong catalytic ***,various LDHs toward novel separators or interlayers,cathodes,anodes,and interesting catalytic templates are researched to resolve these *** this review,the recent progress for LDHs applied in Li-ion batteries and Li-S batteries including the synthesis methods,designs and applications is presented and ***,the existing challenges and future perspectives associated with material designs and practical applications of LDHs for these two classes of cells are *** hope that the review can attract more attention and inspire more profound researches toward the LDH-based electrochemical materials for energy storage.

关键词： Layered double hydroxide Synthesis methods Structural designs Lithium-ion battery Lithium-sulfur battery Electrochemical performances

PIV MEASUREMENTS OF THE NEAR-WAKE FLOW OF AN AIRFOIL ABOVE A FREE SURFACE

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Journal of Hydrodynamics 2007年第4期19卷 482-487页

作者： Daichin kang wen ZHAO Li-li Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Rapid Manufacturing Engineering Center Shanghai University Shanghai 200444 China

The near-wake flow of a NACA0012 airfoils mounted above a water surface were experimentally studied in a wind/wave tunnel. The main objective of this study is to investigate the influence of the free surface on the structure of the airfoil trailing wake. The flow structure was measured with different ride heights between the airfoil and free surface using a Particle Image Velocimetry （PIV） system. The Reynolds number based on the chord length of the airfoil was about 3.5×10^3. For each experimental condition, large amount of instantaneous velocity fields were captured and ensemble-averaged to get the spatial distributions of mean velocity and mean vorticity, as well as turbulence statistics. The results show that the flow structures of the airfoil wake varies remarkably with the change in the ride height.

关键词： wing-in-ground effect NACA0012 airfoil free surface wake flow Particle Image Velocimetry (PIV) measurement

Effect of the number of irradiation holes on rock breaking under constant laser energy

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Petroleum Science 2022年第6期19卷 2969-2980页

作者： Hai-zeng Pan Yi Hu Yong kang ze-Feng Wang Jia-Wei Liu Hao Chen Meng-Da Zhang Hubei Key Laboratory of Waterjet Theory and New Technology Wuhan UniversityWuhan430072HubeiChina School of Power and Mechanical Engineering Wuhan UniversityWuhan430072HubeiChina The Institute of Technological Sciences Wuhan UniversityWuhan430072HubeiChina School of Urban Construction Wuhan University of Science and TechnologyWuhan430081HubeiChina Jianghan Machinery Research Institute Limited Company of CNPC Wuhan430000HubeiChina

The use of mechanical drilling in accessing energy resources stored in deep and hard rock formations is becoming increasingly ***,laser irradiation has emerged as a novel drilling method with considerable in this *** study examines the variation of rock fracture length,fracture tortuosity,hole size,and rock breaking efficiency for a different number of holes and laser power,based on the constant total energy of laser *** indicated by the results,increasing the laser power increases the laser intensity,which helps increase the hole diameter and ***,for the same laser power,increasing the number of irradiated holes reduces the laser energy absorbed by each hole,which is not conducive to increasing the hole *** the number of holes increases,the mass loss of the rock also increases,while both specific energy(SE)and modified specific energy(MSE)*** the number of holes remains the same,the mass of the shale removed by low power is less than that removed by high power,while SE and MSE have an inverse relation with ***,high laser power and multiple-hole irradiation are more conducive to rock ***,the fracture length and fracture tortuosity of the rock irradiated by the low laser power will increase first and then decrease with the increase in the number of holes,and reach the peak value when the irradiation takes place through three *** a high-power laser irradiates the rock,the fracture length and tortuosity will increase with the increase in the number of irradiation *** is because a rock irradiated by low power dissipates more energy,with the result that the energy absorbed by the sample with four irradiation holes is not enough to break the rock *** study is expected to provide some guidance to break rock for drilling deep reservoirs and hard rock formations using laser irradiation.

关键词： Number of irradiation holes Rock breaking Fracture tortuosity Macrofracture