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Layered Double Hydroxides Nanosheets In-Situ Anchored on Ultrathin Mxenes for Enhanced U(Vi) and Eu(Iii) Trapping: Excavating from Selectivity to Mechanism

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SSRN 2022年

作者： Gu, Pengcheng Zhang, Sai Ma, Ran Sun, Mingtai Wang, Suhua Wen, Tao Wang, Xiangke School of Resources and Environment Anhui Agricultural University Hefei230036 China MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Guangdong Maoming525000 China

As a rising star among two-dimensional materials, transition metal carbides (MXenes) with prominent characteristic including chemical functionality and high hydrophilic unfold enormous potential for radionuclide sequestration. The design of functionalized MXenes with high uptake capacity and excellent selectivity as well as outstanding anti-interference ability still remains a grand challenge. In this study, a novel MgAl-LDHs functionalized ultrathin Ti 3 C 2 T x MXene (L-TC) nanosheets with a typical flower-shaped structure was designed, and tested for U(VI) and Eu(III) elimination. The in-situ anchoring strategy of LDHs nanosheets provided an effective path for overcoming the demerits of limited layer space, insufficiency action sites and poor stability of pristine MXenes sheets. Adsorption measurements indicate that the higher porosity and diverse functional groups are conducive for L-TC materials to capture U(VI) and Eu(III). Impressively, L-TC exhibit exceptional trapping capacities toward U(VI) (241.0 mg g -1 ) and Eu(III) (97.1 mg g −1 ), which were significantly higher than those of the original Ti 3 C 2 T x and LDHs. More importantly, L-TC exhibited high uptake selectivity, fast rapid removal kinetics and excellent anti-ion interference. The enrichment mechanism is clearly elucidated and visualized by spectral analysis, revealing a unique U(VI) and Eu(III) uptake selectivity driven by metal-oxygen sites of L-TC via complexation action. This work highlights the bright future of the functional MXene materials in the application of radioactive contaminant, especially for the remediation of the high valence radioactive ions. © 2022, The Authors. All rights reserved.

关键词： Nanosheets

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Experimental and Heat Transfer Studies of Micro Heat Pipe Pv/T system by Reynolds Number and Heat Transfer Coefficient Enhancement

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SSRN 2023年

作者： Li, Rui Li, Jinping Zhang, Xuemin Zhu, Junjie Guo, Xiao Novakovic, Vojislav School of Energy and Power Engineering Lanzhou University of Technology Lanzhou730050 China Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy Lanzhou730050 China Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns Lanzhou730050 China Solar Energy Department Institute for Energy Technology Kjeller2007 Norway Department of Energy and Process Engineering Norwegian University of Science and Technology TrondheimNO-7491 Norway

The photovoltaic/thermal (PV/T) system, as an energy conversion system to generate electricity and heat, has great application potential in northwest zone of ample solar energy resource in China. Previous studies limited investigated the heat exchange of working media inside the MHP. For working fluid as R141b in the MHP, higher Reynolds Number (Re) theoretically means better heat transfer. During the typical winter season, when the inclination of the PV panel was 45°, the average power conversion efficiency (PCE) and thermal collection efficiency (TCE) can reach 12.8% and 26.4%, respectively. Furthermore, in order to reduce the simulation time and facilitate the research, the study establishes the fitting equation of MHP-PV/T surface temperature based on solar radiation intensity and environmental temperature with an average error of 7.6%. Furthermore, a three-dimensional mathematical model of MHP-PV/T system was developed and validated with experimental results, investigating the Re of R141b in the MHPs and calculating the related heat transfer coefficient (h) based on Re. The simulation shows that the Re and h at the condensation section of the MHP are bigger than those at the evaporation section when the wall temperature of the MHP exceeds 305.25K of the boiling point of R141b. The Re and h increases with the water temperature decrease of airfoil heat exchanger and solar radiation intensity rise. Lastly, when water temperature of airfoil heat exchanger is unchanged, the impact of solar radiation intensity on h is greater than Re. When the solar radiation intensity remains unchanged and the water temperature decreases, Re is the main reason for affecting the change of h. The research results will give a scientific foundation and technical application for the MHP-PV/T system, as well as more efficient solar energy applications in the future. © 2023, The Authors. All rights reserved.

关键词： Water temperature

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Room Impulse Response Reshaping-Based Blind Source Separation for an Underdetermined Reverberant Environment

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SSRN 2024年

作者： Xie, Yuan Zou, Tao Yang, Junjie Sun, Weijun Xie, Shengli School of Mechanical and Electrical Engineering Guangzhou University Guangdong-Hong Kong-Macao Key Laboratory of Multi-scale Information Fusion and Collaborative Optimization Control of Complex Manufacturing Process Guangzhou510006 China School of Automation Guangdong University of Technology Joint International Research Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education of the P.R.C. Guangzhou510006 China School of Automation Guangdong University of Technology Guangdong Key Laboratory of IoT Information Processing Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China School of Automation Guangdong University of Technology Key Laboratory of Intelligent Detection and the IoT in Manufacturing Ministry of Education 111 Center for Intelligent Batch Manufacturing Based on IoT Technology Guangzhou510006 China

Blind source separation under an underdetermined reverberation environment is a very challenging issue. The classical method is based on the expectation maximization algorithm. However, it is limited to high reverberation environments, resulting in bad or even invalid separation performance. To eliminate this restriction, a room impulse response reshaping-based expectation maximization method is designed to solve the problem of blind signal separation in an underdetermined reverberant environment. Firstly, a room impulse response reshaping technology is designed to eliminate the influence of audible echo on the reverberant environment, improving the quality of the received signals. Then, a new mathematical model of time-frequency mixing signals is established to reduce the approximation error of model transformation caused by high reverberation. Furthermore, an improved expectation maximization method is proposed for real-time update learning rules of model parameters, and then the sources are separated using the estimators provided by the improved expectation maximization method. Experimental results based on source separation of speech and music mixtures demonstrate that the proposed algorithm achieves better separation performance while maintaining much better robustness than popular expectation maximization methods. © 2024, The Authors. All rights reserved.

关键词： Reverberation

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Reducing process of sinter in COREX shaft furnace and influence of sinter proportion on reduction properties of composite burden

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Journal of Central South University 2021年第3期28卷 690-698页

作者： SHI Ben-jing ZHU De-qing PAN Jian HU Bing WANG Zhao-cai Zhongye Changtian International Engineering Co. Ltd.Changsha 410205China Process Research Institute National Engineering Research Center of Sintering and Pelletizing Equipment SystemChangsha 410205China Key Laboratory of Hunan Province for the Synergetic Control and Resource Reuse of the Multi-Pollutants of Flue Gas Changsha 410205China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

In order to reduce the materials cost of COREX ironmaking process,sinter has been introduced into the composite burden in *** work explored the reducing process of sinter in COREX shaft furnace to clarify its reduction properties change and then the effect of sinter proportion on metallurgical performance of composite burden was *** results show that the reducing process of sinter in COREX shaft furnace was basically same with that in blast furnace but sinter seems like breaking *** reducing condition simulated COREX shaft furnace,sinter possessed the worst reduction degradation index(RDI)and undifferentiated reduction index(RI)compared with pellet and iron ore *** and microscopic mineralogy changes indicated that sinter presents integral cracking while pellet and lump ore present surface cracking,and no simple congruent relationship exists between cracks of the burden and its ultimate reduction degradation *** existence of partial metallurgical performance superposition between composite and single ferrous burden was ***_(+6.3)≥70%and RDI_(+3.15)≥80%were speculated as essential requirements for the composite burden containing sinter in COREX shaft furnace.

关键词： sinter COREX shaft furnace reducing process composite burden reduction degradation index(RDI) metallurgical performance

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Brøsted acidic pyridinium-based ILs catalyzed the selective dimerization of isobutene: Performance and in-situ NMR study

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Molecular Catalysis 2020年 482卷

作者： Yu, Xiaojia Liu, Ying Wang, Hui Cheng, Weiguo Wu, Youqing Zhang, Suojiang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex System Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Department of Chemical Engineering for Energy Resources East China University of Science and Technology Shanghai200237 China

Brøsted acidic pyridinium-based ILs of [NS][CF3SO3] and [NS][HSO4] have been synthesized for oligomerization of isobutene with the excellent conversion of 92.8% and the good selective dimerization at the temperature of below 100 °C. Hydroxyl-containing materials, especially ethanol, could facilitate catalytic activities to excellent conversions of isobutene and 84.2% selectivity of diisobutene. [NS][CF3SO3] could be recovered by a simple liquid-to-liquid separation and reused more than ten times without obvious loss of catalytic activities. The formation process of oligomers has been examined by in-situ NMR spectroscopy, and a step-by-step generation process of carbonium ions varying from C4+, C8+ to C12+ was proposed. The work behaves the significance of constructing a better catalysis system for highly selective dimerization of isobutene, and potential being scaled-up for industrialization. © 2019 Elsevier B.V.

关键词： Dimerization

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A novel centralized cross-efficiency evaluation via explainable artificial intelligence in the context of big data

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European Journal of Operational Research 2025年

作者： Yang, Min Wang, Zixuan Liang, Liang Management School Hefei University of Technology Hefei230009 China Key Laboratory of Process Optimization and Intelligent Decision-Making Ministry of Education Hefei230009 China Intelligent Interconnection System Anhui Provincial Laboratory Hefei230009 China NSFC Fundamental Research Center on Smart Interconnected System Engineering Hefei230009 China

Cross-efficiency evaluation in data envelopment analysis (DEA) assumes that decision making units (DMUs) have full flexibility in choosing weights according to their individual preferences. However, this total autonomy may be inapplicable in some centralized organizational scenarios. To address this problem, this paper introduces a novel centralized cross-efficiency evaluation which considers both individual and organizational preferences with assistance of explainable artificial intelligence (XAI) in the context of big data. Specifically, XAI is first applied to approach the organizational efficiency function and then calculate the marginal contribution of each variable as the variable importance, which represents the organizational preference. Furthermore, we propose a centralized secondary goal model to select the unique optimal weight profile from the candidate weights that remain self-efficiency as Pareto-optimal, such that the deviation between individual and organizational preferences is minimized. In addition, a centralization factor is introduced to ensure that the model's centralization degree corresponds to the actual centralization level in organizational management. Finally, the proposed method is applied to evaluate the efficiency of DMUs within three different centralized organizations sequentially. The results verify that the proposed method yields more discriminative and robust efficiency scores within organizations compared to several previous cross-efficiency evaluation methods. © 2025 Elsevier B.V.

关键词： Risk perception

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A quantitative pairwise comparison-based constraint handling technique for constrained optimization

arXiv

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arXiv 2023年

作者： Huang, Ting Zhang, Qiang Pedrycz, Witold Yang, Shanlin School of Management Hefei University of Technology Hefei Box 270 Anhui Hefei230009 China Key Laboratory of Process Optimization and Intelligent Decision-making Ministry of Education Hefei Box 270 Anhui Hefei230009 China Ministry of Education Engineering Research Center for Intelligent Decision-Making & Information System Technologies Anhui Hefei230009 China Department of Electrical & Computer Engineering University of Alberta EdmontonABT6G 2R3 Canada

This study proposes a new constraint handling technique for assisting metaheuristic optimization algorithms to solve constrained optimization problems more effectively and efficiently. Given any two solutions of any constrained optimization problems, they are first mapped into a two-dimensional Cartesian coordinate system with their objective function value differences and constraint violation differences as the two axes. To the best of our knowledge, we are the first to deal with constraints by building such a Cartesian coordinate system. Then, the Cartesian coordinate system is divided into a series of grids by assigning ranks to different intervals of differences. In this way, a pairwise comparison criterion is derived with the use of the fused ranks, which achieves non-hierarchical comparison neither preferring objective function values nor constraint violations, resulting in more accurate evaluation compared with existing techniques. Moreover, an evaluation function that is equivalent to the pairwise comparison criterion is proposed, which further improves computational efficiency. The effectiveness and efficiency of the proposed constraint handling technique are verified on two well-known public datasets, that is, CEC 2006 and CEC 2017. The results demonstrate that metaheuristic optimization algorithms with using the proposed constraint handling technique can converge to a feasible optimal solution faster and more reliably. Experimental analysis on the parameters involved reveal guidance for their optimal *** Codes 90-08 (Primary) Copyright © 2023, The Authors. All rights reserved.

关键词： Constrained optimization

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Coupling trade-offs and supply-demand of ecosystem services(ES):A new opportunity for ES management

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Geography and Sustainability 2021年第4期2卷 275-280页

作者： Qiang Feng Wenwu Zhao Baoling Duan Xiangping Hu Francesco Cherubini College of Resources and Environment Shanxi University of Finance and EconomicsTaiyuanShanxi 030006China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Institute of Land Surface System and Sustainable Development Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Industrial Ecology Programme and Department of Energy and Process Engineering Norwegian University of Science and Technology(NTNU)N-7491 NorwegianNorway

The trade-offs and supply-demand relations of ecosystem services(ES)are at the frontier of geographical and ecological ***,previous studies have focused on either trade-offs or the supply-demand aspects,while ES conflicts and supply/demand contradictions have not been comprehensively *** relation-ship between ES trade-offs and supply-demand is logically valid and studying the coupling of both can provide approaches for simultaneously alleviating ES conflicts and supply-demand *** study,based on a review of previous analyses of ES trade-offs and supply-demand dynamics,proposes a new analytic framework to couple ***,we define two types of trade-offs based on the directions of growth or decline of the two *** also define the supply-demand balance area and the supply-demand risk area according to the ES flow ***,the mechanisms driving ES trade-offs are clarified,and land-use scenarios are set based on the ***,the supply-demand spatial characteristics of ES are analyzed,and supply-demand risk areas are ***,scenario iterations are performed to minimize the supply-demand risk area at an acceptable trade-offintensity to identify an optimal land use plan,which simultaneously alleviates ES conflicts and supply-demand *** analytic framework offers new opportunities for improving sustainable ecosystem management.

关键词： Environmental management Service conflicts Supply-demand contradictions Coupling analysis

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A Scanner Matching Method based on Interior-point BFGS Algorithm 5

A Scanner Matching Method based on Interior-point BFGS Algor...

引用

5th International Workshop on Advanced Patterning Solutions, IWAPS 2021

作者： Chen, Yuguang Li, Sikun He, Jianfang Zhang, Libin Shi, Weijie Tang, Ming Wei, Yayi Wang, Xiangzhao Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Science Laboratory of Information Optics and Opto-Electronic Technology Shanghai China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China Integrated Circuit Advanced Process RD Center Institute of Microelectronics Chinese Academy of Sciences Beijing China Dongfang Jingyuan Electron Limited Beijing China National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Wuhan China

ISBN: (纸本)9781665420785

A scanner matching method based on interior-point BFGS algorithm is proposed. This method minimizes the critical dimension (CD) differences by optimizing parameters of illumination sources, including inner partial coherence factor, outer partial coherence factor, numerical aperture and opening angle of illumination poles for dipole and quadrupole sources. Simulations of scanner matching are performed. Scanners with annular, dipole and quadrupole sources are matched in the simulations. Through-pitch Line/space patterns are used as the matching targets. The results of these simulations show that, the proposed method can reduce root-mean-square of CD differences after matching. In the majority of the simulation cases, the proposed method is faster than methods based on the Levenberg-Marquardt algorithm, and could even achieve better result. Analyses on the proposed method are given. © 2021 IEEE.

关键词： Photolithography

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Room Impulse Response Reshaping-Based Underdetermined Blind Source Separation in a Reverberant Environment

SSRN

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SSRN 2023年

作者： Xie, Yuan Zou, Tao Yang, Junjie Sun, Weijun Xie, Shengli School of Mechanical and Electrical Engineering Guangzhou University Guangzhou Key Laboratory of Integrated Automation of Manufacturing Process Guangzhou510006 China School of Automation Guangdong University of Technology Joint International Research Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education of the P.R.C. Guangzhou510006 China School of Automation Guangdong University of Technology Guangdong Key Laboratory of IoT Information Processing Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China School of Automation Guangdong University of Technology Key Laboratory of Intelligent Detection and the IoT in Manufacturing Ministry of Education 111 Center for Intelligent Batch Manufacturing Based on IoT Technology Guangzhou510006 China

A room impulse response reshaping-based underdetermined blind source separation algorithm is designed to solve the signal separation problem in a reverberant environment. The main contribution is the use of room impulse response reshaping technology to eliminate the influence of audible echo for the reverberant environment, improving the quality of the received signals. A new mathematical model of time-frequency mixing signals is established to reduce the approximation error of model transformation caused by high reverberation. Furthermore, an improved expectation maximization algorithm is proposed for real-time update learning rules of model parameters, and then the sources are separated using the estimators provided by the improved expectation maximization algorithm. Experimental results demonstrate that the proposed algorithm achieves better separation performance to speech and music mixtures while maintaining much better robustness than the popular expectation maximization algorithms. © 2023, The Authors. All rights reserved.

关键词： Blind source separation

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