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Densification of MXene films by sequential bridging

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National Science Review 2022年第1期9卷 10-11页

作者： Hui-ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

Voids are an essential scientific issue when it comes to traditional composite materials, because they greatly degrade the laer’s properties and usually cause catastrophic failure [1].

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Reversible Mechanochemistry Enabled Autonomous Sustaining of Robustness of Polymers—An Example of Next Generation Self-healing Strategy

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Chinese Journal of Polymer Science 2021年第5期39卷 545-553,I0005页

作者： ming-Xuan Li Min-Zhi Rong ming-Qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Guangdong Provincial Key Laboratory of High Performance Polymer CompositesSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Even under low external force,a few macromolecules of a polymer have to be much more highly stressed and fractured first due to the inherent heterogeneous *** the materials keep on working under loading,as is often the case,the minor damages would add up,endangering the safety of *** we show an innovative solution based on mechanochemically initiated reversible cascading variation of metal-ligand *** loading,crosslinking density of the proof-of-concept metallopolymer networks autonomously increases,and recovers after ***,the stress-induced tiny fracture precursors are blocked to grow and then *** entire processes reversibly proceed free of manual intervention and *** proposed molecular-level internal equilibrium prevention mechanisms fundamentally enhance durability of polymers in service.

关键词： Metal-ligand complexations Polyurethane Mechanochemistry Mechanical properties Robustness

Microbial safety control of compost material with cow dung by heat treatment

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Journal of Environmental Sciences 2007年第8期19卷 1014-1019页

作者： GONG Chun-ming Xiamen Environmental Protection Research Institute Xiamen 361006 China. Laboratory of Soil Microbiology Faculty of Agriculture Saga University Saga840-8502 Japan

Various kinds of pathogenic bacteria derived from the intestinal tract of animals exist in compost material like cow dung. In order to sterilize the pathogenic bacteria completely in compost material, the cow dung was put into a heat treatment machine in pilot plan, and harmless condition in short time was examined. The results indicated, pathogenic indicator bacteria such as coliform bacteria, fecal coliform, Escherichia coli and salmonella were all 106 cfu/g dw at the beginning, died rapidly when cow dung temperature rose to above 50~C, and not detected at 54-68~C for 6-24 h heat treatment. Coliform bacteria and salmonella in heated cow dung were not detected by re-growth culture and enrichment culture examination. Moreover, it was hardly influenced on the fermentation ability of composting microbe, organic decomposition bacteria. During heat treatment, the mesophile decreased rapidly and the thermophile stabilized or increased, and the most of composting microbe were bacillus in cow dung by fluorescence microscope, this indicated that bacillus was dominator and composting microbe in composting process.

关键词： microbial safety control pathogenic bacteria compost cow dung heat treatment

Direction finding of coexisted independent and coherent signals using electromagnetic vector sensor

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Journal of Systems Engineering and Electronics 2012年第4期23卷 481-487页

作者： ming Diao Chunlian An College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001P.R.China

The existing direction of arrival （DOA） estimation algorithms based on the electromagnetic vector sensors array barely deal with the coexisting of independent and coherent signals. A two-dimensional direction finding method using an L-shape electromagnetic vector sensors array is proposed. According to this method, the DOAs of the independent signals and the coherent signals are estimated separately, so that the array aperture can be exploited sufficiently. Firstly, the DOAs of the independent signals are estimated by the estimation of signal parameters via rotational invariance techniques, and the influence of the co- herent signals can be eliminated by utilizing the property of the coherent signals. Then the data covariance matrix containing the information of the coherent signals only is obtained by exploiting the Toeplitz property of the independent signals, and an improved polarimetric angular smoothing technique is proposed to de-correlate the coherent signals. This new method is more practical in actual signal environment than common DOA estimation algorithms and can expand the array aperture. Simulation results are presented to show the estimating performance of the proposed method.

关键词： direction finding electromagnetic vector sensor polarimetric angular smoothing estimation of signal parameters viarotational invariance technique Toeplitz property.

A brief review on one-dimensional topological insulators and superconductors

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Science China(Physics,Mechanics & Astronomy) 2016年第3期59卷 39-47页

作者： Huai-ming Guo Department of Physics Beihang University

Recently one-dimensional topological phases are gaining increasing attentions. Like two- and three-dimensional ones, Onedimensional systems are important in a complete understanding of the topological properties. One-dimensional topological phases have been realized using current experimental setups. Specially the signatures of Majorana fermions have been observed in onedimensional topological superconductors engineered with Rashiba nanowires. From the many studies, the paper reviews typical theoretical models of one-dimensional topological insulators and superconductors. For one-dimensional topological insulators, we introduce the Su-Schrieffer-Heeger, superlattices and Creutz models, while for topological superconductors the Kitaev model and Rashiba nanowire are introduced. These models not only provide an overview of one-dimensional topological phases, but also are the starting points for further studies.

关键词： one dimension topological insulators topological superconductors

Recent advances and perspectives of metal/covalent-organic frameworks in metal-air batteries

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Journal of Energy Chemistry 2021年第12期30卷 113-129,I0003页

作者： ming Zhong ming Liu Na Li Xian-He Bu School of Materials Science and Engineering Tianjin Key Laboratory of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Nankai UniversityTianjin 300071China

Metal-air batteries(MABs)have attracted considerable attention as a novel energy technology that can alleviate the severe energy crisis and environmental *** primary processes,including oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)occur on the air cathode and dominate the battery performance during battery charging and ***,metal-organic frameworks(MOFs)and covalent-organic frameworks(COFs)emerge as promising cathode catalysts due to their structure and composition *** unique characteristics of MOFs and COFs contribute to improved *** review mainly summarizes the recent applications of MOFs and COFs in a series of MABs,mainly including lithium-and zinc-air ***,some critical issues are emphasized regarding MOFs and COFs used in other MABs limited progress,their fabrication and alternatives to potential problems.

关键词： Metal-organic frameworks Covalent-organic frameworks Li-air batteries Zn-air batteries Active sites

Synthesis and Characterization of a Novel One-dimensional Metal Organic Compound

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Chinese Journal of Structural Chemistry 2005年第7期24卷 809-815,738页

作者： HUJuan GAOQiu-ming StateKeyLaboratoryofHighPerformanceCeramicsandSuperfineMicrostructures ShanghaiInstituteofCeramicsTheChineseAcademyofSciencesShanghai200050China

A novel metal organic compound of Zn2+ coordinated with 4,5-diazafluorene- 9-one-N2 (C22H12N6) has been synthesized under solvothermal condition. Single-crystal X-ray diffraction analysis showed that the compound is a one-dimensional zig-zag chain structure combined by Cl…H–C bonds. The crystal is of orthorhombic, space group Pnna, C22H12N6Cl2Zn, Mr = 496.65, a = 8.1132(13), b = 18.983(3), c = 13.116(2) ?, Z = 4, V = 2020.2(5) ?3, Dc = 1.633 g/cm3, μ = 1.504 mm-1, F(000) = 1000, T = 293(2) K, the final R = 0.0626 and wR = 0.1474 for 2390 unique reflections and 150 parameters with I > 2σ(I). The refinement method was full-matrix least-squares on F2 with GOF = 0.951. This compound was also characterized by FT-IR, Raman, UV-vis spectra, and TG-DTA.

关键词： zinc 4,5-diazafluorene-9-one-N2 one-dimensional structure synthesis characterization

Surface morphology characterization of unidirectional carbon fibre reinforced plastic machined by peripheral milling

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Chinese Journal of Aeronautics 2022年第2期35卷 361-375页

作者： Chongyan CAI Jiaqiang DANG Qinglong AN Weiwei ming ming CHEN School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

This paper aims to characterise surface morphology and 3D roughness parameters of unidirectional carbon fibre reinforced plastic(UD-CFRP)milled at 0°,45°,90°,and 135°fibre orientation angles(FOAs).Side milling experiments are conducted on UD-CFRP *** damage forms and texture direction of milled surface are *** frequency of defects on CFRP surface is quantitatively determined using radially averaged 2D *** kinematicdynamic surface topography is reconstructed considering feed,runout and vibration,then the ideal roughness parameters,S_(a),S_(q),S_(sk),and S_(ku)are calculated and compared with the measured ones,finally the material factor-induced roughness components are *** show that CFRP surface has no regular feed *** frequency of fibre breakage or surface defects is greater than tooth passing *** sorted by their average S_(a)in descending order is135°>90°>45°>0°,where surface defects contribute 93.9%,77.1%,73.2%,72.2%of the total roughness respectively,which suggests that surface defects show a more important role than tool kinematics and vibration in formation of milled *** negative Skewness(Ssk<0)and high Kurtosis(S_(ku)=4.0–11.5)of milled surface signify porosity and the presence of many anomalous deep valleys in milled surface,respectively.

关键词： Carbon fibre reinforced plastic(CFRP) Surface characterization Surface morphology Surface roughness Surface texture

Process Algebra Approach to Reasoning About Concurrent Actions

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Journal of Computer Science & Technology 2004年第3期19卷 364-373页

作者： YuanFeng ming-ShengYing StateKeyLaboratoryofIntelligentTechnologyandSystems DepartmentofComputerScienceandTechnologyTsinghuaUniversityBeijing100083P.R.China

A reasonable transition rule is proposed for synchronized actions and someequational properties of bisimilarity and weak bisimilarity in the process algebra for reasoningabout concurrent actions are presented.

关键词： process global store constraint set bisimulation