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Highly efficient extraction of lithium from salt lake brine by LiAl-layered double hydroxides as lithium-ion-selective capturing material

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Journal of Energy Chemistry 2019年第7期28卷 80-87页

作者： ying sun Xiaoyu Guo Shaofang Hu Xu Xiang State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The extraction of lithium from salt lake brine in the Chinese Qaidam Basin is challenging due to its high Mg/Li and Na/Li ratios. Herein, we utilized a reaction-coupled separation technology to separate sodium and lithium ions from a high Na/Li ratio brine(Na/Li = 48.7, w/w) and extracted lithium with Li Al-layered double hydroxides(Li Al-LDHs). The Li Al-LDHs act as lithium-ion-selective capturing materials from multication brines. That is, the lithium ions selectively enter the solid phase to form Li Al-LDHs, and the sodium ions are still retained in the liquid phase. This is because the lithium ions can be incorporated into the structural vacancies of LiAl-LDHs, whereas the sodium ions cannot. The effects of reaction conditions on lithium loss and separation efficiency were investigated at both the nucleation and the crystallization stage, e.g., the nucleation rotating speed, the Li/Al molar ratio, the crystallization temperature and time, and co-existing cations. The lithium loss is as low as 3.93% under optimal separation *** sodium ions remained in the solution. Consequently, an excellent Na/Li separation efficiency was achieved by this reaction-coupled separation technology. These findings confirm that LiAl-LDHs play a critical function in selectively capturing lithium ions from brines with a high Na/Li ratio, which is useful for the extraction of lithium ions from the abundant salt lake brine resources in China.

关键词： LiAl-LDHs Lithium extraction Energy metal Salt lake brine Reaction-coupled separation technology

Visible Light Photocatalytic Properties and Thermochromic Phenomena of Nanostructured BiOCl Microspheres

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Journal of Materials Science & Technology 2014年第11期30卷 1130-1133页

作者： Jiushan Cheng Cong Wang Yinfang Cui ying sun ying Zuo Center for Condensed Matter and Material Physics Department of PhysicsBeihang University

Black nanostructured BiOCI microspheres were directly synthesized by a hydrothermal method. The black ball- like BiOCI microspheres and black flower-like BiOCI microspheres were obtained using different surfactant. The color of the BiOCI microspheres turned from black to white when being annealed at 400 ℃ in air for 3 h and could be recovered to black by exposure to ultraviolet light for a few hours. The photocatalytic activity of both the black and the white BiOCI microspheres was characterized by the photo-degradation of methyl orange dye under visible light irradiation. The black ball-like nanostructure BiOCI displayed the best photocatalytic activity, compared with the white BiOCI and the black flower-like BiOCI. It can degrade the methyl orange dye to 20% within 70 min under visible light irradiation. The high activity of the BiOCI ball-like sphere may own to its special morphology, strong absorption in visible light range and the existence of oxygen vacancies.

关键词： Photocatalysis Black BiOCI Microsphere Thermochromic

Synthesis of granulated Li_(1.33)Mn_(1.67)O_(4) via two antisolvent methods for lithium adsorption from gas-produced water

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Chinese Journal of Chemical Engineering 2024年第5期69卷 34-46页

作者： Jun Qiu Lu-Ri Bao Wei Guo ying Yang Shu-ying sun National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China

Gas-produced water is an accompanying wastewater in the natural gas extraction process,and it is a potential liquid lithium resource that contains a considerable amount of *** study investigated the feasibility of using manganese-based ion sieves to adsorb and extract lithium from gas-produced *** we focused on the applicability of two different granulation methods,extrusion and droplet,in gas-produced water *** types of H_(1.33)Mn_(1.67)O_(4) particles were prepared by the extrusion method(EHMO)and the droplet method(DHMO).The porosity of DHMO was much higher than that of EHMO,and the adsorption performance of DHMO increased with the decrease of binder *** prepared with a binder concentration of 0.14 g·ml^(-1)exhibited the best adsorption performance in gas-produced water,and the Li^(+)adsorption capacity could reach 25.14 mg·g^(-1).In gas-produced water,the adsorption equilibrium of DHMO only took 9 h,and the adsorption process conformed to the Langmuir model and pseudo-second-order kinetic *** pore diffusion model(PDM)could well describe its adsorption ***,DHMO showed a great selectivity to Li^(+),and the selectivity order of DHMO in gas-produced water was Li^(+)>Ba^(2+)>>Mg^(2+),Ca^(2+),Sr^(2+)>>Na^(+)>>K^(+).After 20 cycles,the Li^(+)adsorption capacity was still higher than 17.30 mg·g^(-1),and the rate of manganese dissolution was less than 1%.

关键词： Gas-produced water Granulation Li_(1.33)Mn_(1.67)O_(4)

User association and resource allocation in green mobile edge networks using deep reinforcement learning

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The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 1-10,27页

作者： Zheng ying sun Siyuan Wei Yifei Song Mei School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

In order to meet the emerging requirements for high computational complexity, low delay and energy consumption of the 5 th generation wireless systems(5 G) network, ultra-dense networks(UDNs) combined with multi-access edge computing(MEC) can further improve network capacity and computing capability. In addition, the integration of green energy can effectively reduce the on-grid energy consumption of system and realize green computation. This paper studies the joint optimization of user association(UA) and resource allocation(RA) in MEC enabled UDNs under the green energy supply pattern, users need to perceive the green energy status of base stations(BSs) and choose the one with abundant resources to associate. To minimize the computation cost for all users, the optimization problem is formulated as a mixed integer nonlinear programming(MINLP) which is NP-hard. In order to solve the problem, a deep reinforcement learning(DRL)-based association and optimized allocation(DAOA) scheme is designed to solve it in two stages. The simulation results show that the proposed scheme has good performance in terms of computation cost and time out ratio, as well achieve load balancing potentially.

关键词： multi-access edge computing(MEC) ultra-dense networks(UDNs) deep reinforcement learning(DRL) user association(UA) resource allocation(RA) green energy

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Optimal Pricing and Return-Freight Insurance:Strategic Analysis of E-Sellers in the Presence of Reputation Differentiation

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Journal of Systems Science & Complexity 2022年第6期35卷 2302-2318页

作者： YANG ying CHAI Rui sun Xinyu LI Yiming School of Economics and Management Xidian UniversityXi'an 710126China Research Center for Digital Economy(Greater Bay Area) School of Economics and Management Shenzhen Research InstituteTsinghua UniversityShenzhen 518057China Meituan BC BlockWangjing Hengdian BuildingBeijing 100102China School of Management Xi'an Jiaotong UniversityXi'an 710049China

Motivated by the practice that e-sellers cooperate with insurance companies to offer consumers the return-freight insurance(RI),this paper aims to investigate the competing e-sellers’RI *** the information asymmetry in the online context,reputation system is widely applied by *** an online market with two competing e-sellers that sell the same product but are differentiated in their reputation,this paper builds an analytical model to explore the e-sellers optimal pricing and RI *** with sellers’reputation and their RI strategies,the equilibrium outcomes under four cases are *** paper reveals the conditions that e-sellers are willing to offer ***,the findings demonstrate that low reputation e-seller is more likely to offer ***,when the sellers are more divergent,they are more likely to co-exist in the *** premium and RI compensation play critical roles in their *** introduction tends to increase the price,thus offsets the benefits of RI,but does not affect the total consumer surplus.

关键词： Game theory product returns reputation return-freight insurance

Inter‑Skeleton Conductive Routes Tuning Multifunctional Conductive Foam for Electromagnetic Interference Shielding,Sensing and Thermal Management

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Nano-Micro Letters 2025年第3期17卷 19-36页

作者： Xufeng Li Chunyan Chen Zhenyang Li Peng Yi Haihan Zou Gao Deng Ming Fang Junzhe He Xin sun Ronghai Yu Jianglan Shui Caofeng Pan Xiaofang Liu School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191People’s Republic of China Tianmushan Laboratory Xixi Octagon CityYuhang DistrictHangzhou 310023People’s Republic of China Science and Technology On Electromagnetic Scattering Laboratory Beijing Institute of Environmental FeaturesBeijing 100854People’s Republic of China

Conductive polymer foam(CPF)with excellent compressibility and variable resistance has promising applications in electromagnetic interference(EMI)shielding and other integrated functions for wearable ***,its insufficient change amplitude of resistance with compressive strain generally leads to a degradation of shielding performance during ***,an innovative loading strategy of conductive materials on polymer foam is proposed to significantly increase the contact probability and contact area of conductive components under *** inter-skeleton conductive films are constructed by loading alginate-decorated magnetic liquid metal on the polymethacrylate films hanged between the foam skeleton(denoted as AMLM-PM foam).Traditional point contact between conductive skeletons under compression is upgraded to planar contact between conductive ***,the resistance change of AMLM-PM reaches four orders of magnitude under ***,the inter-skeleton conductive films can improve the mechanical strength of foam,prevent the leakage of liquid metal and increase the scattering area of EM ***-PM foam has strain-adaptive EMI shielding performance and shows compression-enhanced shielding effectiveness,solving the problem of traditional CPFs upon *** upgrade of resistance response also enables foam to achieve sensitive pressure sensing over a wide pressure range and compression-regulated Joule heating function.

关键词： Inter-skeleton conductive films Conductive polymer foam Liquid metal Electromagnetic interference shielding

Information Flow Scheduling in Concurrent Multi-Product Development Based on DSM

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Chinese Journal of Mechanical Engineering 2017年第5期30卷 1101-1111页

作者： Qing-Chao sun Wei-Qiang Huang ying-Jie Jiang Wei sun School of Mechanical Engineering Dalian University of Technology

Multi-product collaborative development is adopted widely in manufacturing enterprise, while the present multi-project planning models don＇t take techni- cal/data interactions of multiple products into account. To decrease the influence of technical/data interactions on project progresses, the information flow scheduling models based on the extended DSM is presented. Firstly, infor- mation dependencies are divided into four types： series, parallel, coupling and similar. Secondly, different types of dependencies are expressed as DSM units, and the exten- ded DSM model is brought forward, described as a block matrix. Furthermore, the information flow scheduling methods is proposed, which involves four types of opera- tions, where partitioning and clustering algorithm are modified from DSM for ensuring progress of high-priority project, merging and converting is the specific computation of the extended DSM. Finally, the information flow scheduling of two machine tools development is analyzed with example, and different project priorities correspond to different task sequences and total coordination cost. The proposed methodology provides a detailed instruction for information flow scheduling in multi-product development, with specially concerning technical/data interactions.

关键词： Concurrent multi-product development Information flow planning Extended DSM Projectpriority

Normal Bases and Their Dual-Bases over Finite Fields

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Acta Mathematica Sinica,English Series 2006年第3期22卷 845-848页

作者： Qun ying LIAO Qi sun The Mathematical College of Sichuan University The Mathematical and Soft-Ware Scientific College of Sichuan Normal University

In this paper, we prove the following results： 1） A normal basis N over a finite field is equivalent to its dual basis if and only if the multiplication table of N is symmetric; 2） The normal basis N is self-dual if and only if its multiplication table is symmetric and Tr（α^2） = 1, where α generates N; 3） An optimal normal basis N is self-dual if and only if N is a type-Ⅰ optimal normal basis with q = n = 2 or N is a type-Ⅱ optimal normal basis.

关键词： Normal bases over finite fields Optimal normal bases Multiplication tables of normal bases

High-Temperature Creep Behavior and Microstructural Evolution of a Cu-Nb Co-Alloyed Ferritic Heat-Resistant Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 789-801页

作者： ying Han Jiaqi sun Jiapeng sun Guoqing Zu Weiwei Zhu Xu Ran Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun 130012China School of Materials Science and Engineering Changchun University of TechnologyChangchun 130012China College of Mechanics and Materials Hohai UniversityNanjing 211100China

The creep behavior of Fe–17 Cr–1.2 Cu–0.5 Nb–0.01 C ferritic heat-resistant stainless steel was investigated at temperatures ranging from 973 to 1123 K and stresses from 15 to 90 *** evolution of precipitates after creep deformation was analyzed by scanning electron microscopy,energy dispersion spectrum,and transmission electron *** minimum creep rate decreased with the decrease in the applied load and temperature,thereby extending the rupture ***-rich phase and Nb-rich Laves particles were generated in dominant quantities during the creep process,and the co-growth relationship between them could be *** rupture was featured by ductile fracture with considerable *** increasing the temperature and decreasing the stress,the softening of the metal matrix was accelerated,showing more obvious plastic fl *** true stress exponent and activation energy were 4.9 and 375.5 kJ/mol,respectively,indicating that the creep deformation was dominated by the diffusion-controlled dislocation creep mechanism involving precipitate-dislocation *** on the creep rupture data obtained,the Monkman–Grant relation and Larson-Miller parameter were established,which described the creep rupture life for the studied steel well.

关键词： Stainless steel Creep Precipitate Deformation mechanism