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High Fe‑Loading Single‑Atom Catalyst Boosts ROS Production by Density Effect for Efficient Antibacterial Therapy

Nano-Micro Letters 2025年第2期17卷 187-203页

作者： Si Chen Fang Huang Lijie Mao zhimin zhang Han Lin Qixin Yan Xiangyu Lu Jianlin Shi Department of Cardiology Shanghai Tenth People’s HospitalSchool of MedicineTongji UniversityShanghai 200092People’s Republic of China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050People’s Republic of China Shanghai Frontiers Science Center of Nanocatalytic Medicine School of MedicineTongji UniversityShanghai 200092People’s Republic of China

The current single-atom catalysts(SACs)for medicine still suffer from the limited active site ***,we develop a synthetic method capable of increasing both the metal loading and mass-specific activity of SACs by exchanging zinc with *** constructed iron SACs(h^(3)-FNC)with a high metal loading of 6.27 wt%and an optimized adjacent Fe distance of~4 A exhibit excellent oxidase-like catalytic performance without significant activity decay after being stored for six months and promising antibacterial ***,a“density effect”has been found at a high-enough metal doping amount,at which individual active sites become close enough to interact with each other and alter the electronic structure,resulting in significantly boosted intrinsic activity of single-atomic iron sites in h^(3)-FNCs by 2.3 times compared to low-and medium-loading ***,the overall catalytic activity of h^(3)-FNC is highly improved,with mass activity and metal mass-specific activity that are,respectively,66 and 315 times higher than those of commercial Pt/*** addition,h^(3)-FNCs demonstrate efficiently enhanced capability in catalyzing oxygen reduction into superoxide anion(O_(2)·^(−))and glutathione(GSH)*** in vitro and in vivo assays demonstrate the superior antibacterial efficacy of h^(3)-FNCs in promoting wound *** work presents an intriguing activity-enhancement effect in catalysts and exhibits impressive therapeutic efficacy in combating bacterial infections.

关键词： Nanocatalytic medicine Single-atom catalysts Reactive oxygen species(ROS) High metal loading Oxidase catalysis

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SUPERCONVERGENCE OF DG METHOD FOR ONE-DIMENSIONAL SINGULARLY PERTURBED PROBLEMS

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Journal of Computational Mathematics 2007年第2期25卷 185-200页

作者： Ziqing Xie zhimin zhang College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China Department of Mathematics Wayne State University Detroit MI 48202 USA

The convergence and superconvergence properties of the discontinuous Galerkin （DG） method for a singularly perturbed model problem in one-dimensional setting are studied. By applying the DG method with appropriately chosen numerical traces, the existence and uniqueness of the DG solution, the optimal order L2 error bounds, and 2p＋ 1-order superconvergence of the numerical traces are established. The numerical results indicate that the DG method does not produce any oscillation even under the uniform mesh. Numerical experiments demonstrate that, under the uniform mesh, it seems impossible to obtain the uniform superconvergence of the numerical traces. Nevertheless, thanks to the implementation of the so-called Shishkin-type mesh, the uniform 2p ＋ 1-order superconvergence is observed numerically.

关键词： Discontinuous Galerkin methods Singular perturbation Superconvergence,Shishkin mesh Numerical traces

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Commercial Application of Novel Heavy Oil Catalytic Cracking Catalyst HSC

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China Petroleum Processing & Petrochemical Technology 2017年第1期19卷 11-18页

作者： zhang zhimin Qilu Branch of SINOPEC Catalyst Co. LTD Zibo 255336

The commercial application of a novel RFCC catalyst HSC used in an 1.4 Mt/a RFCC unit at a refinery A was introduced. The application results show that in comparison with the base catalyst, the yield of dry gas and slurry was reduced, while the total liquid yield, gasoline yield and LPG yield increased by 1.34, 5.05 and 1.43 percentage points,respectively. The properties of the products showed no significant change while the anti-abrasion strength of the catalyst was relatively high. Based on the mid-term calibration test, the summary calibration test and the daily statistics of long term industrial application practice, the HSC catalyst features a strong conversion ability of heavy oil, a high gasoline yield, a satisfactory product distribution and a good selectivity.

关键词： heavy oil FCC catalyst industrial application structural stability

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Internet of Brain, Thought, Thinking, and Creation

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Chinese Journal of Electronics 2022年第6期31卷 1025-1042页

作者： zhang zhimin YIN Rui NING Huansheng School of Computer and Communication Engineering University of Science and Technology Beijing Beijing Engineering Research Center for Cyberspace Data Analysis and Applications

Thinking space came into being with the emergence of human civilization. With the emergence and development of cyberspace, the interaction between those two spaces began to take place. In the collision of thinking and technology, new changes have taken place in both thinking space and cyberspace. To this end, this paper divides the current integration and development of thinking space and cyberspace into three stages, namely Internet of brain(IoB), Internet of thought(IoTh), and Internet of thinking(IoTk). At each stage, the contents and technologies to achieve convergence and connection of spaces are discussed. Besides, the Internet of creation(IoC) is proposed to represent the future development of thinking space and cyberspace. Finally, a series of open issues are raised, and they will become thorny factors in the development of the Io C stage.

关键词： thinking space IoTk Internet of thinking IoTh Internet of thought cyberspace development Internet of Things Internet of brain cyber-physical systems IoB human civilization emergence

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Moments of discounted dividend payments in a risk model with randomized dividend-decision times

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Frontiers of Mathematics in China 2017年第2期12卷 493-513页

作者： zhimin zhang Chaolin LIU College of Mathematics and Statistics Chongqing University Chongqing 401331 China

We consider a perturbed compound Poisson risk model with randomized dividend-decision times. Different from the classical barrier dividend strategy, the insurance company makes decision on whether or not paying off dividends at some discrete time points （called dividend-decision times）. Assume that at each dividend-decision time, if the surplus is larger than a barrier b 〉 O, the excess value will be paid off as dividends. Under such a dividend strategy, we study how to compute the moments of the total discounted dividend payments paid off before ruin.

关键词： Moments of discounted dividends compound Poisson model,integro-differential equation ruin

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UNIFIED ANALYSIS OF TIME DOMAIN MIXED FINITE ELEMENT METHODS FOR MAXWELL'S EQUATIONS IN DISPERSIVE MEDIA

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Journal of Computational Mathematics 2010年第5期28卷 693-710页

作者： Jichun Li zhimin zhang Department of Mathematical Sciences University of Nevada Las Vegas NV 8915~-~020 USA Department of Mathematics Wayne State University Detroit MI 48202 USA

In this paper, we consider the time dependent Maxwell＇s equations when dispersive media are involved. The Crank-Nicolson mixed finite element methods are developed for three most popular dispersive medium models： the isotropic cold plasma, the one-pole Debye medium and the two-pole Lorentz medium. Optimal error estimates are proved for all three models solved by the Raviart-Thomas-Ndd@lec spaces. Extensions to multiple pole dispersive media are presented also.

关键词： method.Maxwell's equations Dispersive media Mixed finite element

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Prediction Model of Abutment Pressure Affected by Far-Field Hard Stratum Based on Elastic Foundation Theory

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Computers, Materials & Continua 2021年第1期66卷 341-357页

作者： zhimin zhang Tianhe Kang Key Laboratory of In-situ Property-Improving Mining of Ministry of Education Taiyuan University of TechnologyTaiyuan030024China

In view of the three-dimensional dynamic abutment pressure,the influence of the far-field hard stratum(FHS)in deep,thick coal seams is *** on elastic foundation theory,a three-dimensional dynamic prediction model of the abutment pressure was *** this model,the dynamic change in the coal seam abutment pressure caused by the movement of the FHS was studied,and a method for determining the dynamic change range of the abutment pressure was *** results of the new prediction model of the abutment pressure are slightly higher than the measured values,with an error of 0.51%,which avoids the shortcomings of the results because the Winkler foundation model results are lower than the measured values and have an error of 9.98%.As time progresses,the abutment pressure and its distribution range are affected by the FHS movement,which has the characteristics of gradually increasing dynamic change until the FHS *** peak value of the abutment pressure increases linearly with time,and the influence range increases with time following a power function with an exponent of less than *** influence range of the FHS movement on the abutment pressure ahead of the working face,behind the working face,and along the working face is 10 times,25 times,and 17 times the mining thickness,*** to the actual geological parameters,the dynamic change range of the coal seam abutment pressure was determined by drawing an additional stress curve and by determining the threshold *** research results are of great significance to the partition optimization of the roadway support design of deep,thick coal seams.

关键词： Abutment pressure far-field hard stratum Kerr elastic foundation model dynamic change mechanical model influence range

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Preparation of RE-containing magnesium alloys via molten-salt-mediated magnesiothermic reduction

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Journal of Magnesium and Alloys 2023年第3期11卷 981-990页

作者： zhimin zhang Xuchen Lu Yan Yan State Key Laboratory of Multi-phase Complex systems Institution of Process EngineeringChinese Academy of ScienceHaidian DistrictBeijing 100190PR China

RE-containing magnesium alloys were prepared via molten-salt-mediated magnesiothermic reduction by using RE_(2)O_(3)(RE=Y,Nd and Gd)and Mg metal as raw *** thermomechanical analysis of the magnesiothermic reduction reactions in molten salt was *** the molten-salt-mediated magnesiothermic reduction process was studied from three different *** that,the RE-containing magnesium alloy was characterized by using chemical analysis,XRD analysis and SEM *** magnesiothermic reduction was a liquid-liquid reaction with relatively weak driving *** the melting process and the magnesiothermic reduction process,magnesium metal and the obtained alloy went up and down as a whole in molten salt,which improved the process safety without introducing chloride ***,the hydrolysis of the RECl_(3^(-))containing molten salt occurred at elevated temperature,which severely impeded the magnesiothermic reduction *** the magnesiothermic reduction at 750°C for 2.0 h,the content of RE and the common impurity elements in the obtained RE-containing alloy met the both requirements of the commercial WE43A and WE43B.

关键词： Magnesium alloy Rare earth Magnesiothermic reduction Molten salt

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A New Family of Nonconforming Elements with H(curl)-Continuity for the 3D Quad-Curl Problem

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Communications in Computational Physics 2023年第4期33卷 1069-1089页

作者： Baiju zhang zhimin zhang School of Mathematics and Statistics Yunnan UniversityKunming650091China Beijing Computational Science Research Center Beijing 100193China Department of Mathematics Wayne State UniversityDetroitMI 48202USA

We propose and analyze a new family of nonconforming finite elements for the three-dimensional quad-curl *** proposed finite element spaces are subspaces of H(curl),but not of H(grad curl),which are different from the existing nonconforming ones[10,12,13].The well-posedness of the discrete problem is proved and optimal error estimates in discrete H(grad curl)norm,H(curl)norm and L2 norm are *** experiments are provided to illustrate the good performance of the method and confirm our theoretical predictions.

关键词： Quad-curl problem nonconforming finite element method

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A novel pathway for the preparation of Mg metal from magnesia

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Journal of Magnesium and Alloys 2022年第10期10卷 2847-2856页

作者： zhimin zhang Xuchen Lu Yan Yan State Key Laboratory of Multi-phase Complex systems Institute of Process EngineeringChinese Academy of ScienceHaidian DistrictBeijing 100190PR

High-purity anhydrous magnesium chloride was prepared from magnesia and ammonium *** chlorination process was analyzed and then the critical stages affecting the purity of anhydrous magnesium chloride were *** effect of sample dimension on the above critical stages was investigated *** purity guarantee mechanism of anhydrous magnesium chloride was *** that,magnesium metal was obtained via electrolyzing the anhydrous magnesium chloride-containing molten *** new process for the continuous production of magnesium metal from magnesia was proposed and *** incomplete chlorination reaction and the hydrolysis of anhydrous magnesium chloride are the two critical stages affecting the purity of the anhydrous magnesium *** dimension of the sample can influence reaction process and reaction mechanism,and thus the problems of incomplete chlorination reaction and hydrolysis can be solved *** magnesia content in anhydrous magnesium chloride was below 0.1 wt.%when the ratio of height to diameter of the sample was over *** content of impurities in the magnesium metal obtained met the specifications of the product *** current efficiency was(94.7±1.8)%and the electricity consumption was(9107±97)kW h/t.

关键词： Magnesium Electrolysis Anhydrous magnesium chloride Hydrolysis

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