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SSRN 2023年

作者： Hu, Zhili Zheng, Jia Pang, Qiu Sun, Qian Zhao, Ning Hubei Long Zhong laboratory Hubei Xiangyang441000 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China Hubei Research Center for New Energy & Intelligent Connected Vehicle Wuhan University of Technology Wuhan430070 China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China National & Local Joint Engineering Laboratory for Special Titanium Alloy Pressing Technologies Western Superconducting Technologies Co. Ltd. Xi’an710018 China

In this study, an in-depth analysis of the microstructure and hardness of 6082 aluminum alloy under a novel solution-forging integrated process is conducted by performing a series of isothermal uniaxial compression tests at various strain rates and aging durations. The results indicate that the highest hardness achieved is 125 HV at peak aging with a forming strain rate of 10 s-1, a 16.1% improvement compared to the conventional T6 forming process. The deformation shortens the subsequent peak aging time from 8 hours in the conventional process to 6 hours. In addition, the composite phases, including short-range disordered B'/U2 phase and composite phase with multiple structures, are also discovered under the condition of a strain rate of 10 s-1 and 6 hours of aging. While, as the strain rate increases, the degree of recrystallization decreases and then the refined grain size increases, accompanied by the increase in dislocation density. For the integrated process, the deformation microstructure inherited to the aging state, including grain morphology and dislocation density, as well as the aging precipitated phase, especially for the formation of composite phase, are the main reasons for the higher hardness after aging than the traditional T6 state. © 2023, The Authors. All rights reserved.

关键词： Strain rate

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A Model Predictive control Approach With Limited-Time Termination for Virtually Coupled Train Set

A Model Predictive Control Approach With Limited-Time Termin...

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Chinese Automation Congress (CAC)

作者： Xiaobin Pu Liqun Fan Qiusheng Liu Xiaolin Luo Qingdong Jia Kaixuan Li Kun Zhang Hongjie Liu Shenzhen Metro Group Co. Ltd. Shenzheng China Shenzhen Municipal Design and Research Institute Co. Ltd. Shenzheng China Traffic Control Technology Co. Ltd. Beijing China State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Beijing China

ISBN: (数字)9798350368604

ISBN: (纸本)9798350368611

To improve the flexibility and efficiency of railway services, virtual coupling has been investigated widely. It forms multiple train units as a virtually coupled train set (VCTS), deploying advanced communication and control technologies instead of physical couplers. To operate VCTS as desired, all units should drive synchronously, while satisfying a safety constraint to regulate the following distance. Thus, model pre-dictive control approaches are a promising solution to achieve VCTS operation. However, the computation efficiency of MPC is a critical problem to be addressed, considering the limited capabilities of realistic on-board train computers. To solve this problem, this paper proposes a fast-safe MPC approach that can terminate in a limited time while generating a quasi-optimal and feasible controller. By adding barrier functions that are specifically transferred from constraints in VCTS operation, we formulate an augmented cost function for MPC. Then, a fast-safe solver is designed to analytically solve the optimal control problem in MPC, using the gradient of augmented cost function and adaptive updating steps. Experimental results demonstrate that our approach can yield controllers for VCTS in a limited time, while operating VCTS stably and guaranteeing constraint satisfaction.

关键词： Couplings Computers Optimal control Couplers Drives Cost function Rail transportation Safety Predictive control Convergence

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Residual solvent extraction via chemical displacement for efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 8-14,I0001页

作者： Min Fang Lei Tao Wen Wu Qi Wei Yingdong Xia Ping Li Xueqin Ran Qi Zhong Guichuan Xing Lin Song Peter Müller-Buschbaum Hui Zhang Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816JiangsuChina Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Key Laboratory of Advanced Textile Materials&Manufacturing Technology Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Institute of Joint Key Laboratory of the Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipa 999078MacaoChina Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität München.James-Franck-Str.185748 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenLichtenbergstr.185748 GarchingGermany

Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to *** acetate(MAAc)ionic liquid has recently been realized as an environmentally friendly solvent for solution processed *** specific high viscosity,low vapor pressure and strong association with perovskite precursor of the MAAc solvent is a double-edged sword,which endowed an advantageously ambient air operational and anti-solvent free perovskite deposition,but the MAAc is likely to be retained within the film and bring in detrimental effects on device performance of the corresponding solar ***,we reported a novel route to eliminate the residual solvent via a facial hydrochloric acid(HCl)annealing post-treatment(HAAP).In particular,chemical displacement reaction between the incorporated HCl and residual MAAc can be initiated to form volatile MACl and HAc,efficiently extracting MAAc *** the meanwhile,the stimulated mass transport via downward penetration and upward escape can trigger secondary perovskite growth with enlarged grain size and smoothened surface,leading to reduced defect state and improved interfacial contact intimacy,and also partial chloride ions are able to enter the crystal lattice to stabilize perovskite phase *** a result,a champion efficiency up to20.78%originating from enhanced Voc was achieved,and more than 96%of its initial efficiency can be maintained after 1000 h shelf-storage.

关键词： Perovskite Solar cells Solvent residue Methylammonium acetate Post-treatment Chemical displacement

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Tuning graphene thermal modulator by rotating

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International Journal of Smart and Nano Materials 2020年第3期11卷 310-323页

作者： Ning Wei Yixin Zhang Yang Chen Yingyan Zhang Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxiChina College of Water Resources and Architectural Engineering Northwest A&F UniversityYanglingChina Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghaiChina School of Engineering RMIT UniversityBundooraAustralia

Exploring the thermal transport of graphene is significant for the application of its thermal ***,it is still a challenge to regulate the thermal conductivity of graphene *** study the interfacial thermal transport mechanism of the bilayer graphene by utilizing the molecular dynamics *** the simulation,the interfacial thermal conductivity is regulated and controlled by lattice matching and *** lattice mismatched bilayer graphene model,combining the straining and torsion,can increase the interfacial thermal resistance(ITR)about 3.7 *** variation trend of the ITR is explained by utilizing the vibrational spectra and the overlap ***,the thermal conductivity is proportional to the overlapping *** results show that the tailoring models can regularly control the thermal conductivity in a wide range by twisting the angle between upper and lower *** findings can provide a guideline for thermoelectric manage-ment and device design of thermal switch.

关键词： Interfacial thermal resistance bilayer graphene torsion

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Polynorepinephrine-Regulated Filler Sulfonation Toward Interfacial Reformation And Conductive Promotion Of Nanocomposite Proton Exchange Membrane

SSRN

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SSRN 2023年

作者： Huang, Tong Liu, Xin Ma, Ruibin Gao, Yangyang Xu, Xiaomin Yan, Chengrun Guo, Yuchen Li, Xiaoxu Sharma, Kamlesh Liu, Lingling Xue, Jiandang Huang, Huadong Zhang, Xiyuan Yin, Xiaochun Zhai, Shaoxiong Chen, Jiechao Jia, Xiaoyang He, Shaojian Lin, Jun Zhang, Liqun Qin, Yanzhou State Key Laboratory of Engines School of Mechanical Engineering Tianjin University Tianjin300072 China Sichuan Diwei Energy Technology Co. Ltd. Mianyang621000 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing211816 China Chengdu Vehicle Environmental Protection Technology Co. Ltd. Chengdu610093 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou310007 China State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu610065 China Graduate School of Frontier Sciences The University of Tokyo Chiba277-8561 Japan Guangdong Provincial Key Laboratory of Fuel Cell Technology South China University of Technology Guangzhou510640 China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou510640 China Beijing Institute of Smart Energy Beijing101499 China Key Laboratory of Advanced Materials of Ministry of Education Tsinghua University Beijing100084 China Chongqing Key Laboratory of Green Aviation Energy and Power Chongqing Jiaotong University Chongqing401120 China Guangdong Provincial Key Laboratory of Distributed Energy Systems Dongguan University of Technology Dongguan523808 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Kharagpur India

Interfacial compatibility between filler and matrix substantially affects the overall morphology and performance of nanocomposites. Compared with bare montmorillonite (MMT), surface modified product such as sulfonated MMT (SMMT) has been known to render optimized interfacial compatibility in composite proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs). Nevertheless, in-depth understanding and investigation on the sulfonation of MMT are seldom focused, such as uniformity and sufficiency. Herein, these broadly neglected issues are proposed and resolved using an exemplary polynorepinephrine (PNE)-regulated SMMT (SNMMT). Rather than direct sulfonation utilizing the inherent hydroxyl groups of MMT, a PNE coating with ample hydroxyl groups is deposited on MMT beforehand, which results in more homogeneous and sufficient sulfonation of SNMMT. Compared with normal SMMT, this alteration on surficial geography of filler functionalization brings significant benefits when composited with Nafion matrix, including harmonized filler-matrix compatibility, improved mechanical stability and enhanced proton conduction. Moreover, the antioxidative ability of PNE layer enables improved chemical stability of nanocomposite PEM. The Nafion/SNMMT composite PEM achieves 0.275 S cm-1 proton conductivity at 95 ºC in water, evidently beyond any previously reported composite PEMs using normal SMMT. Equipped with this reformed nanocomposite PEM, both PEMFC and DMFC display competitive peak power densities (1.121 W cm-2 with H2/O2 at 80 ºC/100% relative humidity (RH) for PEMFC, and 0.228 W cm-2 with 1.6 M methanol/100% RH O2 for DMFC), and simultaneously show minor performance deteriorations in constant current density operation and RH cycle tests. It would be instructive the specific focus and reformation on the uniformity and sufficiency of filler modification may render significant interface and performance advancements for na

关键词： Nanocomposites

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Engineering grain boundaries in monolayer molybdenum disulfide for efficient water-ion separation

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Science 2025年第6735期387卷 776-782页

作者： Shen, Jie Aljarb, Areej Cai, Yichen Liu, Xing Min, Jiacheng Wang, Yingge Wang, Qingxiao Zhang, Chenhui Chen, Cailing Hakami, Mariam Fu, Jui-Han Zhang, Hui Li, Guanxing Wang, Xiaoqian Chen, Zhuo Li, Jiaqiang Dong, Xinglong Shih, Kaimin Huang, Kuo-Wei Tung, Vincent Shi, Guosheng Pinnau, Ingo Li, Lain-Jong Han, Yu Physical Sciences and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore Department of Physics King Abdulaziz University Jeddah Saudi Arabia KAUST Catalysis Center King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing China Shanghai Applied Radiation Institute Shanghai Key Laboratory of Atomic Control and Application of Inorganic 2D Supermaterials Shanghai University Shanghai China Department of Mechanical Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Department of Civil Engineering University of Hong Kong Pok Fu Lam Road Hong Kong China Imaging and Characterization Core Lab King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Department of Chemical System Engineering School of Engineering University of Tokyo Tokyo Japan Center for Electron Microscopy South China University of Technology Guangzhou China School of Emergent Soft Matter South China University of Technology Guangzhou China Catalyst Center of Excellence (CCoE) Research and Development Center Saudi Aramco Dhahran Saudi Arabia Center for Sustainability and Energy Technologies Chang Gung University Taoyuan Taiwan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai China University of Chinese Academy of Sciences Wenzhou China

Two-dimensional (2D) materials have long been considered as ideal platforms for developing separation membranes. However, it is difficult to generate uniform subnanometer pores over large areas on 2D materials. We report that the well-defined eight-membered ring (8-MR) pores, typically formed at the boundaries of two antiparallel grains of monolayer molybdenum disulfide (MoS2), can serve as molecular sieves for efficient water-ion separation. The density of grain boundaries and, consequently, the number of 8-MR pores can be tuned by regulating the grain size. Optimized MoS2 membranes outperformed the state-of-the-art membranes in forward osmosis tests by demonstrating both ultrahigh water/sodium chloride selectivity and exceptional water permeance. Creating precise pore structures on atomically thin films through grain boundary engineering presents a promising route for producing membranes suitable for various applications. Copyright © 2025 the authors, some rights reserved.

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Optimizing microalgae cultivation for enhanced lutein production: screening of high-yield strains and cultivation strategy development

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Journal of Applied Phycology 2025年 1-13页

作者： Li, Yuelian Sun, Han Fu, Yunlei Yang, Shufang Lu, Xue China National Chemical Information Center Beijing China Engineering Research Center of Watershed Carbon Neutrality of Ministry of Education and Center for Algae Innovation & Engineering Research School of Resources and Environment Nanchang University Nanchang China Institute of Ocean Research College of Engineering Peking University Beijing China Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced Study Shenzhen University Shenzhen China Discipline of Chinese and Western Integrative Medicine Jiangxi University of Chinese Medicine Nanchang China Institute of New Materials and Advanced Manufacturing Beijing Academy of Science and Technology Beijing China

Microalgae are widely recognized as a promising source of lutein. However, the potential of lutein production by different microalgae varies greatly. This study aims to optimize lutein production by screening high-yield microalgae strains and refining cultivation conditions. Four microalgae strains—Selenastraceae sp. B10, Pectinodesmus sp. F13, Parachlorella kessleri HH2, and Chlorella protothecoides CS-41—were evaluated under autotrophic, heterotrophic, and mixotrophic cultivations. The result indicated that biomass concentration and lutein content were higher in P. kessleri HH2 and C. protothecoides CS-41. The modified Basal medium facilitated the specific growth rate of 1.99 day−1 of P. kessleri HH2, and the maximum biomass concentration of 33.3 g L−1 was achieved by fed-batch cultivation, which was four times higher than batch cultivation. Under autotrophic cultivation, P. kessleri HH2 exhibited robust growth with a maximum biomass of 12.05 g L−1 in high-light and narrow-diameter tubes, while the maximum lutein yield of C. protothecoides CS-41 was 27.77% higher than that of P. kessleri HH2. Two-staged cultivation further improved lutein yield of C. protothecoides CS-41 by 179% increase than that of heterotrophic group. Furthermore, compared to red light and blue light, white light was indicated to increase both cell growth and lutein synthesis of C. protothecoides CS-41, with the biomass concentration of 21.20 g L−1, lutein content of 7.67 mg g−1 and lutein yield of 138.15 mg L−1, which were 5.21%, 16.31% and 42.00% higher than those obtained under blue light, respectively. Consequently, this study indicated that C. protothecoides CS-41 was a promising source for lutein production.

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Design of Palygorskite-Based Aerogels for Organic Dye Waste-Water Treatment

SSRN

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SSRN 2023年

作者： Jin, Huiran Zhou, Xinyu Liu, Yingtong Sun, Weijie Song, Shuchao Yun, Shan Guan, Guofeng Chen, Jing National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province School of Chemical Engineering Huaiyin Institute of Technology Huaian223003 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing210009 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China

It is a challenge to develop high-efficiency, easy-recyclable adsorbents for the removal of dyes from environmental waters. Herein, we report the construction of two types of palygorskite (Pal)-polymer aerogels with distinctive hierarchically meso−microporous structure, which different polymer species—sodium alginate (SA) and chitosan (CS)—through the sol-gel method, cross-linking, and freeze-drying, for the removal of dye pollutants from water. A hierarchical porous structure of aerogel accelerates the diffusion of dye water. Notably, this developed strategy enables selective dye adsorption by tuning the polymer and component contents in the Pal-polymer aerogel. Indeed, the maximum adsorption capacity of the Pal-SA composite aerogel for malachite green (cationic) dye reached 2008 mg/g and that of the Pal-CS(Fe3+) composite aerogel for sunset yellow (anionic) reached 976 mg/g. In addition, the composite aerogels can be regenerated many times without significant loss of effectiveness. This work provides a new concept and strategy for dye waste-water treatment. © 2023, The Authors. All rights reserved.

关键词： Aerogels

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Estimating the value of a statistical life in China: A contingent valuation study in six representative cities

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Chinese Journal of Population,Resources and Environment 2023年第4期21卷 269-278页

作者： Chaoji Cao Xinke Song Wenjia Cai Yichao Li Jianhui Cong Xueying Yu Mengzhao Gao Can Wang Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing100084China Center for Healthy Cities Institute for China Sustainable UrbanizationTsinghua UniversityBeijing100084China Tsinghua Urban Institute Tsinghua UniversityBeijing100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Center for Statistical Science Tsinghua UniversityBeijing100084China Department of Industrial Engineering Tsinghua UniversityBeijing100084China School of Economics and Management Shanxi UniversityTaiyuan030000China School of Economics and Management Beihang UniversityBeijing100191China Beijing Advanced Innovation Center for Big Data-based Precision Medicine Beihang UniversityBeijing100191China Key Laboratory of Big Data-Based Precision Medicine(Beihang University) Ministry of Industry and Information TechnologyBeijing100191China

The value of a statistical life(VSL)is a crucial tool for monetizing health *** explore the VSL in China,this study examines people’s willingness to pay(WTP)to reduce death risk from air pollution in six representative cities in China based on face-to-face contingent valuation interviews(n=3936)from March 7,2019 to September 30,*** results reveal that the WTP varied from CNY 455 to 763 in 2019(USD 66-111),corresponding to a VSL range of CNY 3.79-6.36 million(USD 549395-921940).The VSL in China in 2019 is estimated to be CNY 4.76 million(USD 689659).The statistics indicate that monthly expenditure levels,environmental concerns,risk attitudes,and assumed market acceptance,which have seldom been dis‐cussed in previous studies,significantly impact WTP and *** findings will serve as a reference for ana‐lyzing mortality risk reduction benefits in future research and for policymaking.

关键词： Air pollution Contingent valuation method Willingness to pay Value of a statistical life China

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Observation of charge to spin conversion in p-orbital InBi alloy

arXiv

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arXiv 2025年

作者： Li, Gen Zhang, Ying Xu, Xiaoguang Shen, Lei Feng, Zheng Meng, Kangkang Li, Ang Cheng, Lu He, Kang Tan, Wei Wu, Yong Wu, Yihong Jiang, Yong Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of Education School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Research Institute Chongqing Liang Jiang New Area Chongqing401123 China Department of Mechanical Engineering National University of Singapore 117575 Singapore Microsystem & Terahertz Research Center CAEP Chengdu610200 China Faculty of Materials and Manufacturing Beijing Key Lab of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing100124 China Institute of Quantum Materials and Devices School of Electronic and Information Engineering State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin300387 China

High density data storage and spin-logic devices require highly efficient all-electric control of spin moment. So far, charge-to-spin conversion through the spin Hall effect limits to d-orbital materials associated with strong spin-orbit coupling, especially heavy metals. However, d-orbital heavy metals with strong spin-orbit coupling results in a short spin diffusion length, which restricts the spin transport and accumulation in spintronic devices. Therefore, the conflict between charge-to-spin conversion efficiency and spin transport ability is irreconcilable in d-orbital materials. Here, we report a large charge to spin conversion experimentally observed in the p-orbital In2Bi alloy, exhibiting the coexistence of a large spin Hall angle comparable to heave metal Pt and a long spin diffusion length (4 times that of Pt). First-principles calculations reveal that topological symmetry-protected gap opening near the Fermi level results in large Berry curvature-related spin Hall conductivity. Due to the delocalized nature of p-orbitals and semimetal properties of In2Bi, its spin current can overcome the physical barriers between spin Hall angle and spin diffusion length in d-orbital metals, thereby advancing the development of high-performance spintronic devices. Copyright © 2025, The Authors. All rights reserved.

关键词： Heavy metals

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