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Critical role of corrosion inhibitors modified by silyl ether functional groups on electrochemical performances of lithium manganese oxides

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Journal of Energy Chemistry 2020年第12期29卷 425-433页

作者： min ji Seong Taeeun Yim Department of Chemistry Incheon National UniversityYeonsu-gu 22012IncheonRepublic of Korea Research Institute of Basic Sciences College of Natural ScienceIncheon National UniversityYeonsu-gu 22012IncheonRepublic of Korea

Lithium manganese oxides(Li Mn2 O4, LMO) have attracted significant attention as important cathode materials for lithium-ion batteries(LIBs), which require fast charging based on their intrinsic electrochemical properties. However, these properties are limited by the rapid fading of cycling retention, particularly at high temperatures, because of the severe Mn corrosion triggered by the chemical reaction with fluoride(F-) species existing in the cell. To alleviate this issue, three types of silyl ether(Si–O)-functionalized task-specific additives are proposed, namely methoxytrimethylsilane, dimethoxydimethylsilane, and trimethoxymethylsilane. Ex-situ NMR analyses demonstrated that the Si-additives selectively scavenged the F-species as Si forms new chemical bonds with F via a nucleophilic substitution reaction due to the high binding affinity of Si with F-, thereby leading to a decrease in the F concentration in the cell. furthermore, the addition of Si-additives in the electrolyte did not significantly affect the ionic conductivity or electrochemical stability of the electrolyte, indicating that these additives are compatible with conventional electrolytes. In addition, the cells cycled with Si-additives exhibited improved cycling retention at room temperature and 45 °C. Among these candidates, a combination of MTSi and the LMO cathode was found to be the most suitable choice in terms of cycling retention(71.0%), whereas the cell cycled with the standard electrolyte suffered from the fading of cycling retention triggered by Mn dissolution(64.4%). Additional ex-situ analyses of the cycled electrodes using SEM, TEM, EIS, XPS, and ICP-MS demonstrated that the use of Si-additives not only improved the surface stability of the LMO cathode but also that of the graphite anode, as the Si-additives prevent Mn corrosion. This inhibits the formation of cracks on the surface of the LMO cathode, facilitating the formation of a stable solid electrolyte interphase layer on the su

关键词： Lithium-ion batteries Lithium manganese oxide cathode Electrolyte additive Corrosion Silyl ether Fluoride scavenger

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Influence of sub boundary layer vortex generator height and attack angle on cross-flows in the hub region of compressors

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Chinese Journal of Aeronautics 2022年第8期35卷 30-44页

作者： Hao fu Ling ZHOU Lucheng ji School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Institute for Aero Engine Tsinghua UniversityBeijing 100084China

It has been recently shown that Sub Boundary layer Vortex Generator(SBVG,abbreviated as VG hereafter)can suppress the Cross-Flow(CF),and therefore,can eliminate corner separation and increase aerodynamic loading when installed on the end wall inside middle-load compressor ***,when VGs are applied in high-load compressors,it is difficult to achieve ideal *** is because the definition of the VG attack angle in the presence of CF in existing research is confusing,and the stronger CF in high-load compressors worsens the problem and results in an improper design and optimization range of VG attack ***,this paper clarifies the definition of the VG attack angle in the presence of CF and reveals the CF controlling mechanism of VG on a flat *** differences in the flow phenomena around a VG both with and without CF are also *** numerical results show that a larger height or attack angle of the VG generates a greater CF suppression ***,the cross velocity increases when surmounting the primary vortex induced by the VG,except that this enhanced CF is less conspicuous for larger VG *** to the cases without CF,the VG suffers an additional loss because of the stronger separation and primary vortex loss caused by the CF.

关键词： Compressors Corner separation Cross-flow Flat plate Vortex generator

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Preparative Purification and Bioassay of Bt Toxin from Cry1Ab Transgenic Rice

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Chemical Research in Chinese Universities 2004年第5期20卷 579-583页

作者： WUjian-min YEQin-fu DepartmentofChemistry FacultyofScienceZhejiangUniversityHangzhou310027P.R.China InstituteofNuclear-AgriculturalScience ZhejiangUniversityHangzhou310029P.R.China

A method of extracting and purifying Cry1Ab protein(Bt toxin) from Cry1Ab transgenic rice was established. Most of the Bt toxin present in the tissue of Cry1Ab transgenic rice was extracted effectively with a solution of 50 mmol/LNa_2CO_3 and NaHCO_3. The crude protein containing Bt toxin was obtained after the pretreatment of Cry1Ab transgenic rice with ultra-filtration, ammonium sulfate precipitation and centrifugation. The dialysed crude protein was futher separated on DEAE Sephadex A-50 columns and Sephadex G-150 columns. The protein bound on DEAE Sephadex A-50 gel was eluted with buffer solution B(10 mmol/L tris-HCl buffer+1.0 mmol/L EDTA, pH=8.0) mixed with 0.1, 0.3, 0.5 and 0.8 mol/L NaCl in a discontinuous gradient elution mode. The peak of the Bt toxin eluted from the columns was identified by ELISA and bioassayed with larvae of tobacco hornworms and silkworms. The purity and the bioactivity of the Bt toxin were determined by means of SDS-PAGE and larvicidal assay, respectively. The purity of the Bt toxin obtained by this method is high, and its insecticidal activity is retained after the toxin is purified.

关键词： Transgenic rice Bt toxin Purification Bioassay

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Analysis of Spherical Polyelectrolyte Brushes by Small Angle X-ray Scattering

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Chinese Journal of Polymer Science 2014年第6期32卷 778-785页

作者： Xuan-ji Yu Wei-hua Wang 李莉 Xu-hong Guo Zhi-min Zhou fu-chen Wang School of Chemical Engineering East China University of Science and Technology

Spherical polyelectrolyte brushes （SPBs） with PS core and poly（acrylic acid）（PAA） brushes were prepared and analyzed by SAXS in this article. A radial electron density profile of SPB was brought up, which fits well with the SAXS result and shows a core-shell structure. The effect of pH on SPB form was represented by SAXS and it proves that the chains of SPB will stretch in response to increased pH owning to the increased electrostatic repulsion. SPBs immobilized with magnetic nanoparticles or bovine serum albumin （BSA） were prepared and analyzed by SAXS as well. SAXS could characterize the changes of electron density inside brushes of SPBs due to the immobilization of magnetic nanoparticles or BSA. This provides significant supports for further application of immobilized metal nanoparticles or proteins.

关键词： SPB SAXS Nanoparticles.

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Integral inference method for da/dN-ΔK and P-da/dN-ΔK curves

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航空动力学报 2011年第6期26卷 1251-1256页

作者： fu Hui-min WU Qiong Research Center of Small Sample Technology Beijing University o~ Aeronautics and Astronautics Beijing 100191 China

The integral inference method for fatigue crack growth(FCG) curve was established based on the two-variance regression *** estimates of da/dN-ΔK curve and P-da/dN-ΔK curve with high confidence level and high survival probability were also *** data scatter with stress intensity factor ranges in reality,which limits the group test method's *** presented method analyzes FCG curve as an integration,thus it can exploit the lengthwise information among the FCG rates corresponding to different stress intensity factor ***,compared with group test method,the presented method can not only save specimens,but also have higher precision in the evaluations of da/dN-ΔK and P-da/dN-ΔK curves.

关键词： aero-engine fatigue crack growth(FCG) crack growth rate integral estimate reliability

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Compressive behavior of composite panels with deeply embedded delamination

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航空动力学报 2012年第1期27卷 82-88页

作者： fu Hui-min PENG Bo Research Center of Small Sample Technology Beijing University of Aeronautics and AstronauticsBeijing 100191China

The compressive behavior of laminates with a deeply embedded circular delamination was studied numerically and *** the finite element analysis(FEA),virtual crack closure technique(VCCT) and B-K law were employed to simulate the delamination growth,and the contact of the two substrates was *** effect of the delamination size and through-thickness position on the compressive behavior of laminates with an artificially embedded circular delamination was *** is found that the through-thickness position affects the buckling mode,which then strongly influences delamination growth speed and direction,as well as the dominant component energy release rate(ERR).The numerical results agreed well with the experimental results.

关键词： composite compressive failure delamination propagation buckling VCCT(virtual crack uosure technique)

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Non-fragile control of fuzzy affine dynamic systems via piecewise Lyapunov functions

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Frontiers of Computer Science 2017年第6期11卷 937-947页

作者： Shasha fu jianbin QIU Wenqiang ji Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China

This paper addresses the robust static out- put feedback （SOF） controller design problem for a class of uncertain fuzzy affine systems that are robust against both the plant parameter perturbations and controller gain variations. More specifically, the purpose is to synthesize a non-fragile piecewise affine SOF controller guaranteeing the stability of the resulting closed-loop fuzzy affine dynamic system with certain performance index. Based on piecewise quadratic Lyapunov functions and applying some convexification pro- cedures, two different approaches are proposed to solve the robust and non-fragile piecewise affine SOF controller syn- thesis problem. It is shown that the piecewise affine controller gains can be obtained by solving a set of linear matrix in- equalities （LMIs）. Finally, simulation examples are given to illustrate the effectiveness of the proposed methods.

关键词： fuzzy affine systems non-fragile robust outputfeedback control

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4D printing for future manufacturing

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Science China Materials 2023年第11期66卷 4517-4518页

作者： Chaolin Tan ji Zou Zhengyi fu Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A*STAR)Singapore 636732Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Additive manufacturing(AM),also called three-dimensional(3D)printing,offers disruptive design freedom and manufacturing flexibility due to the layer-wise incremental formation manner of *** in AM techniques provide unique advantages and feasibilities for overcoming challenges arising from fabricating parts with complexities in geometry,materials,and properties.

关键词： printing properties freedom

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Effects of different Ca^(2+) behavior patterns in the electric field on membrane fouling formation and removal of trace organic compounds

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Journal of Environmental Sciences 2022年第1期34卷 292-300页

作者： Zhen Du min ji Ruying Li School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China

The effects of Ca^(2+) on membrane fouling and trace organic compounds(TrOCs)removal in an electric field-assisted microfiltration system were investigated in the presence of Na^(+) alone for *** the electric field,negatively charged bovine serum albumin(BSA)migrated towards the anode far away from the membrane surface,resulting in a 42.9%transmembrane pressure(TMP)reduction in the presence of Na^(+) at 1.5 *** contrast,because of the stronger charge shielding of Ca^(2+),the electrophoretic migration of BSA was limited and led to a neglectable effect of the electric field(1.5 V)on membrane ***,under 3 V applied voltage,the synergistic effects of electrochemical oxidation and bridging interaction between Ca^(2+) and BSA promoted the formation of denser settleable flocs and a thinner porous cake layer,which alleviated membrane fouling with a 64.5%decrease in TMP and nearly 100%BSA *** Tr OCs elimination increased with voltage and reached29.4%–80.4%at 3 *** electric field could prolong the contact between Tr OCs and strong oxidants generated on the anode,which enhanced the Tr OCs ***,a stronger charge shielding ability of Ca^(2+) weakened the electric field force and thus lowered the Tr OCs removal.

关键词： Electric field Membrane fouling Ca^(2+) Flocs formation Trace organic compounds

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Stability in Inverse Problem of Determining Two Parameters for the Moore-Gibson-Thompson Equation with Memory Terms

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Journal of Systems Science & Complexity 2024年第6期37卷 2368-2389页

作者： fu Songren CHEN Liangbiao ZHANG ji-Feng Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Automation and Electrical Engineering Zhongyuan University of TechnologyZhengzhou 450007China

In this paper,the authors consider the inverse problem for the Moore-Gibson-Thompson equation with a memory term and variable diffusivity,which introduce a sort of delay in the dynamics,producing nonlocal effects in *** H¨older stability of simultaneously determining the spatially varying viscosity coefficient and the source term is obtained by means of the key pointwise Carleman estimate for the Moore-Gibson-Thompson *** the sake of generality in mathematical tools,the analysis of this paper is discussed within the framework of Riemannian geometry.

关键词： Carleman estimate memory term Moore-Gibson-Thompson equation stability Riemannian geometry

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