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Microstructure and formation mechanism of SHS joining between C_f/Al composites and TiAl intermetallic with Al–ni–CuO interlayer

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Rare Metals 2015年第1期34卷 17-21页

作者： Zhuo-Ran Li Guang-Jie feng Kai xu Xiang-Long Zhang State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

In this study, it was reported a novel approach for joining Cf/A1 composites and TiA1 intermetallic by self- propagating high-temperature synthesis （SHS）. Mixed powders of 14A1-2ni-3CuO were used as the SHS inter- layer, and differential thermal analysis test of A1-ni-CuO interlayer was conducted to analyze the exothermic char- acteristic. Sound joint was got by SHS joining under the conditions of 600 ℃, 30 min, and 5 MPa. The joint was characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and X-ray diffrac- tion （XRD）. TiA13 and niA13 are, respectively, formed in the TiA1/interlayer and Cf/A1/interlayer interfaces. Reac- tion products of ni2Al3, niAl3, A1203, and Cu were observed in the interlayer. And the formation mechanism of SHS joining was investigated.

关键词： SHS Joining Microstructure Formationmechanism A1-ni-CuO interlayer

Detoxification of insecticides, allechemicals and heavy metals by glutathione S-transferase SIGSTE1 in the gut of Spodoptera litura

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Insect Science 2015年第4期22卷 503-511页

作者： Zhi-Bin xu Xiao-Peng Zou ni Zhang Qi-Li feng Si-Chun Zheng Laboratory of Molecular and Developmental Entomology Guangdong Provincial Key Laboratory of Biotechnology for Plant Development School of Life Sciences South China Normal University Guangzhou 510631 China

Insect glutathione S-transferases （GSTs） play important roles in detoxifying toxic compounds and eliminating oxidative stress caused by these compounds. In this study, detoxification activity of the epsilon GST S1GSTE1 in Spodoptera litura was analyzed for several insecticides and heavy metals. S1GSTE1 was significantly up-regulated by chlor- pyrifos and xanthotoxin in the midgut of S. litura. The recombinant S1GSTE1 had Vmax （reaction rate of the enzyme saturated with the substrate） and Km （michaelis constant and equals to the substrate concentration at half of the maximum reaction rate of the enzyme） values of 27.95 ± 0.88μmol/min/mg and 0.87 ± 0.028 mmol/L for glutathione, respec- tively, and Vmax and Km values of 22.96 ± 0,78μmol/min/mg and 0.83 ± 0.106 mmol/L for 1-chloro-2,4-dinitrobenzene, respectively. In vitro enzyme indirect activity assay showed that the recombinant S1GSTE 1 possessed high binding activities to the insecticides chlor- pyrifos, deltamethrin, malathion, phoxim and dichloro-diphenyl-trichloroethane （DDT）. S1GSTE1 showed higher binding activity to toxic heavy metals cadmium, chromium and lead than copper and zinc that are required for insect normal growth. Western blot analysis showed that S1GSTE1 was induced in the gut of larvae fed with chlorpyrifos or cadmium. S1GSTE1 also showed high peroxidase activity. All the results together indicate that S1G- STE1 may play an important role in the gut orS. litura to protect the insect from the toxic effects of these compounds and heavy metals.

关键词： glutathioneS-transferase heavy metal insecticide midgut Spodoptera litura

Modelling of finger-like channelled anode support for SOFCs application

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Science Bulletin 2016年第17期61卷 1324-1332页

作者： Bin Chen Haoran xu Meng ni Building Energy Research Group Department of Building and Real EstateThe Hong Kong Polytechnic University

This paper established a numerical model for a solid oxide fuel cell （SOFC） button cell, focusing on the effects of finger-like channels on the gas transport process in the anode support. The current densities of channelled button cell and un-channelled button cell are compared at different operating temperature and voltage with H2 as the fuel. The H2 transport is discussed in detail, such as the mole fraction distribution of H2 in the porous layer, the diffusion flux and convective flux of Ha. It is found that the performance of SOFC can be improved by 2.60 % at 800 ~C, 0.5 V, com- pared with un-channelled SOFC due to the improved gas transport by the finger-like channels. Then, the model is further extended to study 2D-planar SOFC fuelled with syngas. The mole fraction gradients of H2, CO, CH4 and CO are all substantially reduced by the finger-like channels compared to un-channelled planar cell. It is found that the SOFC performance is improved by 5.93 % at 800℃, 0.5 V, when syngas fuel is used. The present study clearly demonstrated that the use of finger-like channels in the anode support is effective in improving the gas transport and the SOFC performance. The present model can be employed for subsequent optimization of the channel configuration for further performance improvement.

关键词： Phase inversion CFD modelling Finger-like channels Concentration loss

Flexible optoelectronic neural transistors with broadband spectrum sensing and instant electrical processing for multimodal neuromorphic computing

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SmartMat 2023年第2期4卷 120-130页

作者： Yao ni Lu Yang Jiulong feng Jiaqi Liu Lin Sun Wentao xu Institute of Photoelectronic Thin Film Devices and Technology Nankai UniversityTianjinChina Key Laboratory of Optoelectronic Thin Film Devices and Technology of Tianjin Nankai UniversityTianjinChina Engineering Research Center of Thin Film Photoelectronic Technology Ministry of EducationNankai UniversityTianjinChina Shenzhen Research Institute of Nankai University Nankai UniversityShenzhenChina

A flexible optoelectronic neural transistor(OENT)that consists of a one‐step spin‐coated tri‐blend film composed of 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene(C8‐BTBT),poly(3‐hexylthiophene‐2,5‐diyl)(P3HT),and poly(methyl methacrylate)(PMMA)is *** C8‐BTBT and P3HT phases in the film partially segregate into distinct domains,which combine to provide broadband spectrum sensing,and instant electrical‐processing capabilities dominated by C8‐*** OENT is sensitive to solar radiation from the near‐ultraviolet(NUV)and to visible(Vis)radiation from blue to *** exposed to NUV radiation,the OENT responds sensitively and retains the memory of the exposure for over 10^(3 )*** OENT provides a warning of excessive chronic exposure to harmful *** properties allow high‐pass filtering with different cut‐off frequencies fc that can restrict the reception of blue,green,or *** switchable fc enables sensitive image reconstruction and multitarget *** device combined with a chitosan gel achieves strictly defined short‐range plasticity ofnition system constructed using neuro‐morphological hardware,achieving highly accurate character *** study provides a useful resource that can have applications in wearable biomedical electronics and multimodal neuromorphic computing.

关键词： flexible optoelectronic neural transistor high‐pass filtering Morse‐code recognition system sensitive image reconstruction and multitarget monitoring spatiotemporally correlated coding and logic function

Effect of Orientation on Stress-Rupture Property and Related Deformation Microstructure of a ni-Base Re-containing Single-Crystal Superalloy at 900℃

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 719-728页

作者： Guang-Lei Wang Jin-Lai Liu Ji-De Liu Yi-Zhou Zhou xu-Dong Sun Hai-feng Zhang Xiao-feng Sun School of Materials Science and Engineering Northeastern UniversityShenyang110004China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

Stress-rupture properties of a ni-base Re-containing single-crystal superalloy with three orientations have been tested under 900℃/445 *** obvious anisotropy of stress-rupture property is attributed to orientation reliant deformation *** good strength in[001]orientation is attributed to the rapid multiplication of dislocations active in horizontal channels and laterγ'cutting via dislocations pair coupled with anti-phase *** microtwin formation largely limits the strength and plasticity as a result of the continuous shearing acrossγ/γ'microstructure by{111}112 slip activated in[011]*** property in[111]orientation results mainly from the lateral cross-slip movements of the screw dislocations within connected matrix channels as well as the precipitate shearing by coplanar *** all initially originate from the interdendritic micropores in three *** critical temperature of stress-rupture anisotropy could be increased by a high level of refractory solutes especially Re.

关键词： nickel-base superalloy Stress-rupture property Orientation effec Deformation microstructure Fracture behavior

Simultaneously tailoring material structure and surface for robust sodium storage:A case study of TiO_(2)

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Journal of Materials Science & Technology 2023年第5期136卷 91-96页

作者： Zhenzhu Wang feng Yang Jiangfeng ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China Department of Chemistry Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhen 518055China

Modulating the atomic structure and surface property represents a pivotal and intriguing approach to tai-loring the energy storage performance of battery materials,but their simultaneous modulation via simple processes remains a grand *** TiO_(2)as an example,here we report the structure and sur-face modulation through a simple two-step operation,hydrogenation and fluorination,which impart high electrical conductivity and robust surface activity to the *** introduces Ti^(3+)species in the TiO_(2)bulk to accelerate electron transport,while surface fluorination speeds up sodium-ion reaction *** modulated TiO_(2)exhibits robust Na+storage,affording 181 mAh g^(−1)over 2500 cycles at a high rate of 20 *** addition,when paring with a commercial Na_(3)V_(2)(PO_(4))2 O_(2)F cathode,the designated TiO_(2)allows the full cell to deliver a remarkable power of 3700 W kg^(−1),outperforming most sodium-ion *** correlation between the robust performance and the material property is understood through energy band analysis and density functional theory calculations.

关键词： Sodium-ion battery Titanium dioxide Fluorination Electrochemical performance Rate capability

Normalization of Indexed Differentials by Extending Grobner Basis Theory

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Journal of Systems Science & Complexity 2022年第5期35卷 2016-2028页

作者： LIU Jiang ni feng SONG Shihang DU Mingjun Department of Systems Science University of Shanghai for Science and TechnologyShanghai 200093China

It is a fundamental problem to determine the equivalence of indexed differential polynomials in both computer algebra and differential ***,in the literature,there are no general computational theories for this *** main reasons are that the ideal generated by the basic syzygies cannot be finitely generated,and it involves eliminations of dummy indices and *** paper solves the problem by extending Grobner basis *** authors first present a division of the set of elementary indexed differential monomials E■ into disjoint subsets,by defining an equivalence relation on E■ based on Leibniz expansions of *** equivalence relation on E■also induces a division of a Grobner basis of basic syzygies into disjoint ***,the authors prove that the dummy index numbers of the sim-monomials of the elements in each equivalence class of E■ have upper bounds,and use the upper bounds to construct fundamental restricted ***,the canonical form of an indexed differential polynomial proves to be the normal form with respect to a subset of the Grobner basis in the fundamental restricted ring.

关键词： Canonical form Einstein summation convention free commutative monoid ring Grobner basis indexed differential polynomial

Time-Inconsistent Stochastic LQ Problem with Regime Switching

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Journal of Systems Science & Complexity 2020年第6期33卷 1733-1754页

作者： SI Binbin ni Yuan-Hua ZHANG Ji-feng College of Artificial Intelligence Nankai UniversityTianjin 300350China Key Laboratory of IntelligentRobotics of Tianjin Tianjin 300350China Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy ofSciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

This paper investigates a time-inconsistent stochastic linear-quadratic problem with regime switching that is characterized via a finite-state Markov ***-loop equilibrium control is studied in this paper whose existence is characterized via Markov-chain-modulated forward-backward stochastic difference equations and generalized Riccati-like equations with jumps.

关键词： Forward-backward stochastic difference equation open-loop equilibrium control regime switching stochastic linear-quadratic problem time inconsistency

Synthesis and Structural Characterization of a ni(Ⅱ) Complex [ni(H_2O)_4(4,4'-bipy)_2](hca)_2

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Chinese Journal of Structural Chemistry 2006年第11期25卷 1392-1396页

作者： ZHOU Qiu-xuan xu Qing-feng LU Jian-Mei XIA xue-Wei Key Laboratory of Organic Synthesis of Jiangsu Province School of Chemistry and Chemical Engineering Suzhou University Suzhou 215123 China Jiangsu Polytechnic University Changzhou 213016 China

The reaction of ni（CH3COO）2.6H2O, 4-hydroxycinnamic acid （Hhca） and 4,4＇-bipyridine （bipy） ligand in water-solution afforded a mononuclear complex [ni（H2O）4（4,4＇-bipy）2]（hca）2 which was characterized by IR, elemental analysis, TGA and single-crystal X-ray diffraction. X-ray crystallography analysis reveals that the complex is of triclinic, space group PI with a = 7.0238（14）, b = 7.2934（11）, c = 17.186（4） A, α = 87.073（13）, β = 84.354（10）, γ = 81.961（12）°, V= 866.9（3） A^3, Z = 1, Dc = 1.474 g/cm^3, F（000） = 402,μ = 62.7 mm^-1, R = 0.0411, wR = 0.0862 and GOF = 1.048. In solid state, the cation [ni（H2O）4（4,4＇-bpy）2]^2＋ connects six nearby hca counter anions via O-H…O hydrogen bonds to form an extended 2D lattice framework and the O-…N hydrogen bonds finally link the 2D layers into an infinite 3D network.

关键词： nickel(Ⅱ) 4,4'-bipyridyl trans-4-hydroxycinnamic acid crystal structure