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Dual-ligand and hard-soft-acid-base strategies to optimize metal-organic framework nanocrystals for stable electrochemical cycling performance

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National Science Review 2022年第7期9卷 88-96页

作者： Shasha zheng Yan Sun Huaiguo Xue Pierre Braunstein Wei Huang Huan Pang School of Chemistry and Chemical Engineering Yangzhou University Institut de Chimie UMR 7177 Universite′ de StrasbourgCNRS State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLo FE)Northwestern Polytechnical University

Most metal-organic frameworks(MOFs) hardly maintain their physical and chemical properties after exposure to acidic,neutral,or alkaline aqueous solutions,resulting in insufficient stability,therefore limiting their ***,the design and synthesis of stable size/morphology-controlled MOF nanocrystals is critical but *** this study,dual-ligand and hard-soft-acid-base strategies were used to fabricate a variety of 3D pillared-layer [Ni(thiophene-2,5-dicarboxylate)(4,4’-bipyridine)]nMOF nanocrystals(1D nanofibers,2D nanosheets and 3D aggregates) with controllable morphology by varying the concentration of 4,4’-bipyridine and thus controlling the crystal growth *** to the shorter ion diffusion length,enhanced ele ctron/ion transfer and strong interactions between thiophene-2,5-dicarboxylate and4,4’-bipyridine,the 2D nanosheets showed much larger specific capacitance than 1D nanofibers and 3D aggregates.A single device with an output voltage as high as 3.0 V and exceptional cycling performance(95% of retention after 5000 cycles at 3 mA cm-2) was realized by configuring two aqueous asymmetric super capacitive devices in *** excellent cycling property and charge-discharge mechanism are consistent with the hard-soft-acid-base theory.

关键词： metal-organic framework dual ligand hard-soft-acid-base electrochemical energy storage supercapacitor

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Hybrid Structure Reliability Analysis Based on the Damped Newton Method

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Tsinghua Science and Technology 2020年第5期25卷 668-677页

作者： Hongwei zheng Guangwei Meng Feng Li Tonghui Wei Wei Luo Yaming Guo the School of Mechanical and Aerospace Engineeering Jilin UniversityChangchun 130012China the School of Materials Science and Engineering Jilin UniversityChangchun 130012China

This paper presents a hybrid model reliability analysis method based on the damped Newton method with both random and interval variables to solve the hybrid structure reliability *** method combines an outer iterative solution and inner layer numerical *** the outer iteration,the method seeks an optimized solution to the interval variable iterative by adding the boundary constraint condition based on the damped Newton optimization *** the inner layer solution,the method first reduces the dimension of the random variable through the dimension reduction method,then obtains the first four-order central moment of the function through the application of the Taylor expansion method,and finally calculates the reliability index of the structure according to the fourth-order moment calculation structure of the *** results of a numerical example and an engineering ten-rod truss structure show that the proposed method can effectively solve the random-interval hybrid reliability problem and has better calculation accuracy than that of the two-layer iterative method.

关键词： random-interval variable hybrid model reliability analysis damped Newton optimization single-layer iteration fourth-order moment method

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IL-2-loaded Polypeptide Nanoparticles for Enhanced Anti-cancer Immunotherapy

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Chinese Journal of Polymer Science 2023年第7期41卷 1059-1068页

作者： Xiao-Shuang Wang Zhao-Shi zheng Meng-Fei zheng Di Wang Hong-Lei Zhang Zhen-Qian Zhang Zhi-Lin Liu Zhao-Hui Tang Xue-Mei Han No.1 Department of Neurology China-Japan Union Hospital of Jilin UniversityChangchun130033China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China Jilin Biomedical Polymers Engineering Laboratory Changchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education and Key Laboratory of Polymeric Materials&Application Technology of Hunan Province Xiangtan UniversityXiangtan411105China

Interleukin 2 (IL-2) is widely used as an active immunotherapeutic agent in clinical metastatic cancers. However, its therapeutic concentrations do not last long due to its short half-life. Thus, only a transient proliferation of the anti-cancer CD8+ T cells can be achieved, resulting in poor efficacy. Therefore, the aim of this work was to create a system that promotes CD8+ T cell proliferation at the tumor site using IL-2 persistently present and activates an anti-cancer immune response. This goal was achieved by the design of the IL-2-loaded polypeptide nanoparticles (P-IL-2) where methoxy poly(ethylene glycol) block poly-[(N-2-hydroxyethyl)-aspartamide] phenylboronic acid was used to encapsulate IL-2 through boron-nitrogen coordination with poly(L-lysine). P-IL-2 significantly prolonged the circulation time of IL-2 and achieved a selective drug release at the tumor site in the presence of high levels of reactive oxygen species, thus activating an anti-cancer immune response and exerting a better anti-cancer effect. The half-life of P-IL-2 was 3.15-fold higher than that of IL-2, and the quantity of CD8+ T cells after using P-IL-2 was 1.89-fold higher than that after using IL-2. In addition, the combination of P-IL-2 and anti-CTLA-4 monoclonal antibody resulted in an enhanced immune activation. Hence, this work provides a new approach to improve the efficacy of IL-2 in anti-cancer immunotherapy.

关键词： Polypeptide Phenylboronic acid Boron-nitrogen coordination Interleukin 2 ROS-responsive

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Effect of Wall Thicknesses on Broadband Design of Ka-Band TE_(21)-Mode Coupler

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Journal of Electronic Science and Technology 2021年第4期19卷 350-356页

作者： Wei zheng Chao Wang Wen-Li Yang Chun-Bang Wu with the Institute of Space Antenna China Academy of Space TechnologyXi’an 710100

Commonly,the classical formulas are suitable for designing the TE21-mode coupler for the operating frequency under Ka-band by ignoring the wall ***,in practice,for the one operated in the Ka-band,such classical formulas are not valid and the effect of wall thicknesses should be ***,we propose a design method for the Ka-band TE21-mode coupler via computer simulations,taking into account the wall *** experimental results show that using the linear twice-weighted algorithm to optimize the coupling hole size can improve the coupler *** the bandwidth of such coupler increases by 10%with lower coupling loss(40 dB).

关键词： Coupling loss isolation TE21-mode coupler useless hole

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Evolution Law for Products' Components:A Result for Mass Customization Manufacture

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Wuhan University Journal of Natural Sciences 2011年第1期16卷 21-28页

作者： zheng Xiaojing XU Xusong Economics and Management School Wuhan UniversityWuhan 430072 Hubei China School of Management Harbin University of CommerceHarbin 150076 Heilongjiang China

To forecast exactly the key components＇ quantities needed for the mass customization in complex machine manufac-turing,a weighted acyclic networks directed model is constructed,and the power-law distribution of the topological properties for the networks is mined,which makes the relationship between the sum quantities of products and components as well as the relationship between the sum quantities of products and key components clear. The conclusion is that it is an equilibrium network if the time-scale is short and it is a non-equilibrium network if the time-scale is long. As for the evolution law for the components in the mass customiza-tion process,the exponent for equilibrium networks is 0.99 and the exponent for non-equilibrium networks is 1.36.

关键词： mass customization weighted directed acyclic networks power-law distribution

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Designing metal-organic framework fiber network reinforced polymer electrolytes to provide continuous ion transport in solid state lithium metal batteries

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Nano Research 2024年第4期17卷 2719-2727页

作者： Wanqing Fan Ying Huang Meng Yu Kaihang She Jingren Gou zheng Zhang MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Polyethylene oxide(PEO)-based solid-state electrolytes are considered ideal for electrolyte materials in solid-state lithium metal batteries(SSLMBs).However,practical applications are hindered by the lower conductivity and poor interfacial ***,we propose a strategy to construct a three-dimensional(3D)fiber network of metal-organic frameworks(MOFs).Composite solid electrolytes(CSEs)with continuous ion transport pathways were fabricated by filling a PEO polymer matrix in fibers containing interconnected *** 3D fiber network provides a fast Li+transport path and effectively improves the ionic conductivity(1.36×10^(-4) S·cm^(-1),30℃).In addition,the network of interconnected MOFs not only effectively traps the anions,but also provides sufficient mechanical strength to prevent the growth of Li *** from the advantages of structural design,the CSEs stabilize the Li/electrolyte interface and extend the cycle life of the Li-symmetric cells to 3000 *** assembled SSLMBs exhibit excellent cycling performance at both room and high *** addition,the constructed pouch cells can provide an areal capacity of 0.62 mA·h·cm^(-2),which can still operate under extreme *** work provides a new strategy for the design of CSEs with continuous structure and stable operation of SSLMBs.

关键词： polyethylene oxide(PEO) solid-state lithium metal batteries(SSLMBs) three-dimensional fiber network composite solid electrolytes(CSEs)

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Stability analysis of robotic longitudinal-torsional composite ultrasonic milling

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Chinese Journal of Aeronautics 2022年第8期35卷 249-264页

作者： Lianjun SUN Wenhe LIAO Kan zheng Wei TIAN Jinshan LIU Jindan FENG School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China China Academy of Space Technology Beijing 100094China

Currently,industrial robots are considered as an alternative towards traditional machine *** for the large-scale parts milling,robotic flexibility and low cost make it possess the ***,the milling chatter caused by its weak rigidity hampers robotic application and promotion severely in aviation *** ultrasonic milling(RUM)technology with one-dimensional axial vibration has been proven and approved on avoiding robotic *** on this,the research of project team demonstrates that longitudinal-torsional composite ultrasonic milling(CUM-LT)involving separation characteristic has a greater advantage than RUM in terms of chatter ***,the CUM-LT as a new means is applied to avoid processing vibration of robotic milling *** its influence mechanism on stability improvement of weak stiffness processing system is ***,the approaches to strengthen separation effect are provided ***,a new analysis method of robotic CUM-LT(RCUM-LT)stability is proposed on the basis of ultrasonic function *** simulation and experimental results indicate that compared with robotic RUM(RRUM),stability regions of separated RCUM-LT(SRCUM-LT)and unseparated RCUM-LT(URCUM-LT)are improved by 124.42%and39.20%,*** addition of torsional ultrasonic energy has a wonderful effect on the milling chatter suppression of low stiffness robots.

关键词： Chatter suppression Industrial robots Longitudinal-torsional composite Rotary ultrasonic milling Stability analysis

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Recent Progress in Preparation and Application of Nano-Chitin Materials

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Energy & Environmental Materials 2020年第4期3卷 492-515页

作者： Xuefei Yang Jie Liu Ying Pei Xuejing zheng Keyong Tang School of Materials Science and Engineering Zhengzhou UniversityHenan 450000China

Chitin is a kind of natural macromolecule material which was first discovered in mushrooms and was widely found in the shells of crustaceans and arthropods,the cell walls of fungi(yeast and mold)and algae,and the *** original chitin in nature usually has an antiparallel molecular chain alignment forming nanofibers connected by inter-and intramolecular hydrogen *** microfibers consist of nanofibers about 2-5 nm in diameter,and about 300 nm long,embedded by protein *** to their unique dimensional,optical,mechanical,and other characteristics,the preparation of nano-chitin materials is an important *** is possible to extract nano-chitins from their sources with various methods,including acid hydrolysis,mechanical disintegration,TEMPO-mediated oxidation,electrospinning,and *** this article,the latest progress in recent years in the preparation and applications of nano-chitin were *** morphology of the nano-chitins obtained from the above methods was *** advantages and disadvantages of each method were *** overview of applications of nano-chitins was discussed,including biomedicine,food applications,water treatment,green electronic materials,enzyme immobilization carriers,cotton textile materials,cosmetics,and others.

关键词： applications nano-chitin preparation methods structure

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Spanning Boundaries in Offshore Outsourcing Firms： A Case Study on KM System Initiatives in Wipro Technologies

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Frontiers of Business Research in China 2014年第1期8卷 49-72页

作者： zheng Wang Jing Chen School of compuiing Rational University of Singapore Singapore 117418 Singapore

Despite the increased attention on boundary spanning in organiz- ations, we still know surprisingly little about how boundaries are formed and what spanning activities can be applied to the context of offshore outsourcing firms （OOFs）. This paper examines the antecedents of boundary formation in OOFs and proposes that spanning activities can help OOFs to realize return from their IT investment in an effective and efficient manner. Our findings show that two theoretical models have been identified in this paper. The first model proposed that three boundaries are formed in the OOFs, namely structure, knowledge and subcultural boundaries. We explored the formation process and detailed with steps. The second model therefore is proposed to span these three boundaries and we have expiored detailed mechanisms in this paper.

关键词： boundary spanning IT governance boundary spanners boundaryobjects

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Simulation of High Power THz Emission from Laser Interaction with Tenuous Plasma and Gas Targets

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Communications in Computational Physics 2008年第10期4卷 1258-1278页

作者： zheng-Ming Sheng Hui-Chun Wu Wei-MinWang Min Chen Xiao-Gang Dong Jun zheng Jie Zhang Department of Physics Shanghai Jiao Tong UniversityShanghai 200240China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsCASBeijing 100190China Max-Planck-Institut f¨ur Quanenoptik D-85748 GarchingGermany

With one-and two-dimensional particle-in-cell(PIC)codes,we simulate the generation of high power terahertz(THz)emission from the interaction of ultrashort intense lasers with tenuous plasma and gas *** driving high-amplitude electron plasma waves either with a laser wakefield or the beatwave of two laser pulses,powerful THz electromagnetic pulses can be produced by linear mode conversion in inhomogeneous plasma or by the transient current induced at the surfaces of a thin plasma layer of few plasma *** with incident lasers at moderate intensity such as 1017W/cm2,the produced emission can be at the level of tens of MW in power and capable of affording field strengths of a few MV/cm,suitable for the studies of THz nonlinear *** field ionization included in the PIC codes,THz emission from laser interaction with tenuous gas targets is *** is found that the transient transverse current formed during the ionization processes is responsible for the THz *** this mechanism,onemay also obtain THz fields ofMV/cm at lower laser intensity as compared with the schemes of plasma-wave excitation.

关键词： Particle-in-cell simulation laser-plasma electron plasma wave high power THz emission

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