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Direct seawater splitting for hydrogen production:Recent advances in materials synthesis and technological innovation

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Green Energy & Environment 2025年第1期10卷 11-33页

作者： Yilin Zhao Zhipeng Yu aimin Ge Lujia Liu Joaquim Luis Faria Guiyin Xu Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China International Iberian Nanotechnology Laboratory(INL) Avenida Mestre Jose VeigaBraga4715-330Portugal The MacDiarmid Institute for Advanced Materials and Nanotechnology School of Chemical and Physical SciencesVictoria University of WellingtonWellington6012New Zealand LSRE-LCM-Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials Faculty of EngineeringUniversity of PortoRua Dr.Roberto Frias s/nPorto4200-465Portugal ALiCE-Associate Laboratory in Chemical Engineering Faculty of EngineeringUniversity of PortoRua Dr.Roberto Frias s/nPorto4200-465Portugal

Direct seawater splitting has emerged as a popular and promising research direction for synthesising clean,green,non-polluting,and sustainable hydrogen energy without depending on high-purity water in the face of the world’s shortage of fossil ***,efficient seawater splitting is hindered by slow kinetics caused by the ultra-low conductivity and the presence of bacteria,microorganisms,and stray ions in ***,producing hydrogen on an industrial scale is challenging due to the high production *** present review addresses these challenges from the catalyst point of view,namely,that designing catalysts with high catalytic activity and stability can directly affect the rate and effect of seawater *** the ion transfer perspective,designing membranes can block harmful ions,improving the stability of seawater *** the energy point of view,mixed seawater systems and self-powered systems also provide new and low-energy research systems for seawater ***,ideas and directions for further research on direct seawater splitting in the future are pointed out,with the aim of achieving low-cost and high-efficiency hydrogen production.

关键词： Seawater splitting Catalyst Membranes Mixed seawater systems Self-powered systems

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OPTIMIZATION AND METHOD OF DRAWING CONTROL IN BLOCK CAVING AT TONGKUANGYU MINE

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中国有色金属学会会刊：英文版 1997年第2期7卷 10-15页

作者： Zhou, aimin Changsha Inst of Mining Research Changsha China

ＯＰＴＩＭＩＺＡＴＩＯＮＡＮＤＭＥＴＨＯＤＯＦＤＲＡＷＩＮＧＣＯＮＴＲＯＬＩＮＢＬＯＣＫＣＡＶＩＮＧＡＴＴＯＮＧＫＵＡＮＧＹＵＭＩＮＥ①ＺｈｏｕＡｉｍｉｎＣｈａｎｇｓｈａＩｎｓｔｉｔｕｔｅｏｆＭｉｎｉｎｇＲｅｓｅａｒ... 详细信息

ＯＰＴＩＭＩＺＡＴＩＯＮＡＮＤＭＥＴＨＯＤＯＦＤＲＡＷＩＮＧＣＯＮＴＲＯＬＩＮＢＬＯＣＫＣＡＶＩＮＧＡＴＴＯＮＧＫＵＡＮＧＹＵＭＩＮＥ①ＺｈｏｕＡｉｍｉｎＣｈａｎｇｓｈａＩｎｓｔｉｔｕｔｅｏｆＭｉｎｉｎｇＲｅｓｅａｒｃｈ，Ｃｈａｎｇｓｈａ４１００１２...

关键词： block caving method drawing control computer based production planning drawing optimization

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Distributed model predictive control based on adaptive sampling mechanism

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Chinese Journal of Chemical Engineering 2021年第11期34卷 193-204页

作者： Zhen Wang aimin an Qianrong Li College of Electrical and Information Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou 730050China National Experimental Teaching Center of Electrical and Control Engineering Lanzhou 730050China

In this work,an adaptive sampling control strategy for distributed predictive control is *** to the proposed method,the sampling rate of each subsystem of the accused object is determined based on the periodic detection of its dynamic behavior and calculations made using a correlation ***,the optimal sampling interval within the period is obtained and sent to the corresponding sub-prediction controller,and the sampling interval of the controller is changed accordingly before the next sampling period *** the next control period,the adaptive sampling mechanism recalculates the sampling rate of each subsystem’s measurable output variable according to both the abovementioned method and the change in the dynamic behavior of the entire system,and this process is *** an adaptive sampling interval selection based on an autocorrelation function that measures dynamic behavior can dynamically optimize the selection of sampling rate according to the real-time change in the dynamic behavior of the controlled *** can also accurately capture dynamic changes,meaning that each sub-prediction controller can more accurately calculate the optimal control quantity at the next moment,significantly improving the performance of distributed model predictive control(DMPC).A comparison demonstrates that the proposed adaptive sampling DMPC algorithm has better tracking performance than the traditional DMPC algorithm.

关键词： Chemical process Distributed model predictive control Adaptive sampling mechanism Optimal sampling interval System dynamic behavior

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ON MATRIX AND DETERMINANT IDENTITIES FOR COMPOSITE FUNCTIONS

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Journal of Computational Mathematics 2011年第1期29卷 16-25页

作者： XinghuaWang aimin Xu Department of Mathematics Zhejiang University Hangzhou 310027 China Institute of Mathematics Zhejiang Wdnli University Ningbo 315100 China

We present some matrix and determinant identities for the divided differences of the composite functions, which generalize the divided difference form of Faa di Bruno＇s formula. Some recent published identities can b... 详细信息

关键词： Bell polynomial Composite function Determinant identity Divided difference,Matrix identity.

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Multi-Source Spinal Coding for Coded Caching Multicast Transmissions in Wireless Networks

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China Communications 2021年第3期18卷 91-104页

作者： aimin Tang Xudong Wang University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China

Recently,coded caching has been treated as a promising technique to alleviate the traffic burden in wireless *** support high efficient coded caching multicast transmissions,the time-varying heterogeneous channel conditions need to be *** this paper,a practical and novel multi-source spinal coding(MSSC)scheme is developed for coded caching multicast transmissions under heterogeneous channel *** exploring joint design of network coding and spinal coding(SC),MSSC can achieve unequal link rates in multicast transmissions for different ***,by leveraging the rateless feature of SC in our design,MSSC can well adapt the link rates of all users in multicast transmissions without any feedback of time-varying channel conditions.A maximum likelihood(ML)based decoding process for MSSC is also developed,which can achieve a linear complexity with respect to the user number in the multicast *** results validate the effectiveness of the MSSC *** to the existing scheme,the sum rate of MSSC in multicast transmissions is improved by about 20%.When applying MSSC in coded caching systems,the total transmission time can be reduced by up to 48% for time-varying channels.

关键词： coded caching spinal code network coding multicast transmission wireless networks

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Determination of the in-plane anisotropy field in hexagonal systems via rotational magnetization: Theoretical model and Monte Carlo simulations

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Science China(Physics,Mechanics & Astronomy) 2009年第7期52卷 978-986页

作者： WANG aimin PANG Hua Institute of Applied Magnetics Key Laboratory for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou UniversityLanzhou 730000China

The magnetic anisotropy field in thin films with in-plane uniaxial anisotropy can be deduced from the VSM magnetization curves measured in magnetic fields of constant magnitudes. This offers a new possibility of applying rotational magnetization curves to determine the firstand second-order anisotropy constant in these films. In this paper we report a theoretical derivation of rotational magnetization curve in hexagonal crystal system with easy-plane anisotropy based on the principle of the minimum total energy. This model is applied to calculate and analyze the rotational magnetization process for magnetic spherical particles with hexagonal easy-plane anisotropy when rotating the external magnetic field in the basal plane. The theoretical calculations are consistent with Monte Carlo simulation results. It is found that to well reproduce experimental curves, the effect of coercive force on the magnetization reversal process should be fully considered when the intensity of the external field is much weaker than that of the anisotropy field. Our research proves that the rotational magnetization curve from VSM measurement provides an effective access to analyze the in-plane anisotropy constant K3 in hexagonal compounds, and the suitable experimental condition to measure K3 is met when the ratio of the magnitude of the external field to that of the anisotropy field is around 0.2.

关键词： rotational magnetization curve magnetocrystalline anisotropy in-plane anisotropy constant K3

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ON THE DIVIDED DIFFERENCE FORM OF FAA DI BRUNO＇S FORMULA Ⅱ

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Journal of Computational Mathematics 2007年第6期25卷 697-704页

作者： Xinghua Wang aimin Xu Department of Mathematics Zhejiang University Hangzhou 310027 China

In this paper, we consider the higher divided difference of a composite function f（g（t）） in which g（t） is an s-dimensional vector. By exploiting some properties from mixed partial divided differences and multivariate Newton interpolation, we generalize the divided difference form of Faà di Bruno＇s formula with a scalar argument. Moreover, a generalized Faà di Bruno＇s formula with a vector argument is derived.

关键词： Bell polynomial Faà di Bruno's formula Mixed partial divided difference,Multivariate Newton interpolation.

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Multifractal characteristics of cylindrical sludge drying

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Frontiers of Environmental Science & Engineering 2009年第4期3卷 464-469页

作者： Weiyun WANG aimin LI School of Environmental and Biological Science and Technology Dalian University of TechnologyDalian 116024China

This paper analyzes dewatered sludge drying using the multifractal *** drying rates of cylindrical sludge with equal masses but different crosssectional diameters was studied,from which multifractal parameters such as partition function and quality exponent were *** parameters acquired were used to calculate the multifractal singularity spectrum and indicate the presence of multifractal *** smaller cross-sectional diameters of the sludge were found to be non-homogeneous,and required quantitative methods to analyze.

关键词： multifractal characteristic multifractal singularity spectrum sewage sludge drying

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FORMULATION AND EVALUATION OF AN ANALYTICAL STUDY FOR CYLINDRICAL HELICAL SPRINGS

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Acta Mechanica Solida Sinica 2010年第1期23卷 85-94页

作者： aimin Yu Changjin Yang School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 China School of Urban Railway Transportation Soochow University Suzhou 215021 China

The free vibration analysis of cylindrical helical springs is carried out by means of an analytical study. In the governing equations of the motion of the springs, all displacement functions are defined at the centroid axis and also the effects of the rotational inertia, axial and shear deformations are included in the proposed model. Explicit analytical expressions which give the vibrating mode shapes are derived by rigorous application of the symbolic computing package MATHEMATICA and a process of searching is used to determine the exact natural frequencies. Numerical examples are provided for fixed-fixed boundary conditions. The free vibrational pa- rameters are chosen as the number of coils （n = 4- 14）, the helix pitch angle （a = 5 - 30°） and as the ratio of the diameters of the cylinder and the wire （D/d = 4 - 18） in a wide range. Validation of the proposed model has been achieved through comparison with a finite element model using two-node standard beam elements and the results available in published literature, which in these cases indicates a very good correlation.

关键词： cylindrical helical spring free vibration frequency mode shape

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On Stability of F-Gorenstein Flat Categories

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Algebra Colloquium 2016年第2期23卷 251-262页

作者： Jiangsheng Hu aimin Xu School of Mathematics and Physics Jiangsu University of Technology Changzhou Jiangsu 213001 China School of Mathematical Sciences Qufu Normal University Qufu Shandong 273165 China

To investigate cohomology theories based on flats, Asadollahi and Salarian gave the definition of F-Gorenstein flat R-modules, and these modules are exactly Gorenstein fiat provided that R is right coherent. In this paper, we get some properties of F-Gorenstein flat R-modules and establish the stability of F-Gorenstein flat categories.

关键词： flat cotorsion pair F-Gorenstein flat module F-Gorenstein flat complex

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