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Investigation of anti-corrosion property of hybrid coatings fabricated by combining PEC with MAO on pure magnesium

Journal of Magnesium and Alloys 2022年第10期10卷 2875-2888页

作者： Le Sun Ying Ma Binfeng Fan sheng wang Zhanying wang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Novel hybrid coatings on pure magnesium were prepared by combining plasma electrolytic carburizing(PEC)with micro-arc oxidation(MAO)to further enhance the anti-corrosion property in this *** electron microscopy(SEM)was used to observe the microstructure of the coatings,meanwhile,energy dispersive spectrometry(EDS)and X-ray diffraction(XRD)were separately used to investigate the elemental as well as phase compositions of the *** anti-corrosion property of the coatings was evaluated by potentiodynamic polarization curves as well as electrochemical impedance spectroscopy(EIS).The results show that PEC process is closely related with the effects of adsorption as well as diffusion of the activated carbon atoms,and it can provide a favorable pretreatment surface with predesigned chemical composition to obtain a new kind of phase,namely Si C with superior corrosion resistance and chemical stability,in the following PEC+MAO hybrid ***,PEC preprocessing also can afford an excellent micro-structure to increase the coating thickness as well as to improve the compactness of the PEC+MAO hybrid *** the fabrication process of the PEC+MAO hybrid coatings,an overlapping phenomenon in regard to coating thickness can be observed instead of heaping up layer by *** with both single PEC surface modification layers as well as single MAO coatings,the PEC+MAO hybrid coatings exhibit more superior anti-corrosion ***,the EIS data reveal that the PEC+MAO hybrid coatings can act as an effective protection system to provide relatively excellent long-range anti-corrosion *** also that employing same MAO technique for both single MAO treatment as well as PEC+MAO combining procedure is the key to this research.

关键词： Pure magnesium Plasma electrolytic carburizing Micro-arc oxidation Surface modification layers Hybrid coatings Anti-corrosion property

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Porous carbon polyhedrons coupled with bimetallic CoNi alloys for frequency selective wave absorption at ultralow filler loading

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Journal of Materials Science & Technology 2022年第8期103卷 34-41页

作者： Yan-Li wang Guang-sheng wang Xiao-Juan Zhang Chen Gao School of Chemistry Beihang UniversityBeijing 100191China College of Chemistry and Materials Engineering Beijing Technology and Business UniversityBeijing 100048China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Combining suitable microstructure and dielectric-magnetic synergy effect is conducive to achieve lightweight,broadband,and high-efficiency microwave absorbing materials within low filler ***,porous carbon polyhedrons coupled with bimetallic CoNi alloys were synthesized by using metalorganic frameworks(MOFs)as a template and subsequent pyrolysis *** analysis indicated that the existence of metal Ni element could influence the wave attenuation capacity effectively,resulting in frequency selective wave absorption ***,the pyrolysis temperature was also closely related to wave absorption *** Co_(2)Ni_(1)/C/PVDF composites calcined at 800℃ possessed outstanding wave absorption performance at an ultra-low filler loading of 5 wt%.The minimum reflection loss value achieved-52 dB(10.8 GHz)under the matched thickness of 3 ***,the broadest effective absorption bandwidth(RL<-10 dB)reached 6.2 dB(11.8-18 GHz)for Co/C-800/PVDF composites when the thickness turned into 2 *** remarkable wave attenuation ability was mainly ascribed to magnetic and dielectric loss,impedance matching as well as porous structure effect.

关键词： Porous carbon polyhedrons Bimetallic CoNi alloys Frequency selective wave

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Quasi-shadowing Property on Random Partially Hyperbolic Sets

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Acta Mathematica Sinica,English Series 2018年第9期34卷 1429-1444页

作者： Lin wang Xin sheng wang Yu Jun ZHU School of Applied Mathematics Shanxi University of Finance and Economics Taiyuan 030006 P. R. China College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050024 P. R. China School of Mathematical Sciences Xiamen University Xiamen 361005 P. R. China

Abstract In this paper we investigate the quasi-shadowing property for C1 random dynamical sys-terns on their random partially hyperbolic sets. It is shown that for any pseudo orbit {xk}＋∞ -∞ on a random partially hyperbolic set there exists a ＂center＂ pseudo orbit {Yk}＋∞ -∞ shadowing it in the sense that yk＋l is obtained from the image of yk by a motion along the center direction. Moreover, when the random partially hyperbolic set has a local product structure, the above ＂center＂ pseudo orbit{yk}＋∞ -∞ can be chosen such that yk＋1 and the image of yk lie in their common center leaf.

关键词： Quasi-shadowing property random partially hyperbolic set local product structure

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A novel method for the evaluation of fashion product design based on data mining

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Advances in Manufacturing 2017年第4期5卷 370-376页

作者： Bao-Rui Li Yi wang Ke-sheng wang Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and Automation Shanghai University Shanghai 200072People's Republic of China School of Business Plymouth University Plymouth UK Knowledge Discovery Laboratory Norwegian University of Science and Technology Trondheim Norway

It is difficult to qualitatively evaluate the design effects of product appearance. Electroencephalograph （EEG） and eye-tracking data can serve as reflection of the subcon- scious activities of human beings. The application of advanced neuroscience technology in industrial operation management has become a new research hot spot. This study uses EEG equipment and an eye-tracking device to record a subject＇s brain activity and eye-gaze data, and then uses data mining methods to analyze the correlation between the two types of signals. The fuzzy theory is then applied to create a fuzzy comprehensive evaluation model. The neural attributes are used to quantify the factors affected by product appear- ance and evaluation indicators. We use women＇s shirts as research subjects for a case study. The EEG Emotiv device and Tobii mobile eye-tracking glasses are used to record a subject＇s brain activity and eye-gaze data in order to quantify the evaluation factors related to product appearance. This method not only scientifically evaluates the uniqueness of product appearance but also provides an objective reference for improving product appearance design.

关键词： Product appearance design Evaluation method Data mining Electroencephalograph (EEG) Eye tracking Fuzzy model

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Investigation of mutual effects among additives in electrolyte for plasma electrolytic oxidation on magnesium alloys

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Journal of Magnesium and Alloys 2020年第2期8卷 523-536页

作者： Lingyun An Ying Ma Le Sun Zhanying wang sheng wang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Plasma electrolytic oxidation(PEO)coatings were prepared on AZ91D magnesium alloys in alkaline silicate-based electrolyte with and without *** mutual effects among additives including TiC particles,dispersant polyethylene glycol 6000(PEG6000)and anionic surfactant sodium dodecyl sulfate(SDS)were studied based on orthogonal *** content and distribution of TiC deposited in the coatings were measured by EPMA and *** thicknesses,phase compositions,microstructures and corrosion resistances of the codlings were cAarnined by using TT260 eddy current tuickncss gage,XRD,SEM and clcctrochcniical test,*** results show that the experiment design of this study is the key to study the mutual effects among these *** additive and their interactions all remarkably influence TiC content and corrosion resistance of the *** size TiC is much easier to migrate towards the anode,and the interaction between PEG6000 and SDS both effectively prevents its agglomeration and increases the number of its negative surface charges,which further increase the migration rate and the deposited uniformity of TiC and make TiC have more opportunity to deposit in the discharge ***,when smaller size TiC,PEG6000 and SDS are all added into the electrolyte,they could improve the anti-corrosion property of the coating to the largest extent attributed to higher TiC content and the densest microstructure of the coating.

关键词： Magnesium alloys Plasma electrolytic oxidation Additives Mutual effects Orthogonal experiment Corrosion resistance

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Chung-type Law of the Iterated Logarithm on l^p-valued Gaussian Processes

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Acta Mathematica Sinica,English Series 2006年第2期22卷 551-560页

作者： Wen sheng wang Li Xin ZHANG Department of Statistics East China Normal University Department of Mathematics Zhejiang University

By estimating small ball probabilities for l^P-valued Gaussian processes, a Chung-type law of the iterated logarithm of l^P-valued Gaussian processes is given.

关键词： Small ball probability Gaussian process Law of the iterated logarithm

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MEDV-13 for QSRR of 62 Polychlorinated Naphthalenes

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Chinese Chemical Letters 2002年第8期13卷 791-794页

作者： Shu Shen LIU Chun sheng YIN Lian sheng wang State Key Laboratory of Pollution Control and Resources Reuse Department of Environmental Science&EngineeringNanjing UniversityNanjing 210093

A molecular electronegativity distance vector based on 13 atomic types (MEDV-13) is used to describe the structures of 62 polychlorinated naphthalene (PCN) congeners and related to the gas chromatographic relative retention indices (RIs) of PCNs. Using multiple linear regression, a 4-variable quantitative structure-retention relationship (QSRR) with the correlation coefficient of estimations (r) being 0.9912 and the root mean square error of estimations (RMSEE) being 31.4 and the correlation coefficient of predictions (q) and the root mean square error of predictions (RMSEP) in the leave-one-out procedure are 0.9898 and 33.76, respectively.

关键词： Molecular electronegativity distance vector (MEDV) polychlorinated naphthalene (PCN) gas chromatographic relative retention indice (RI) multiple linear regression (MLR).

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New insights into the regulation of Axin function in canonical Wnt signaling pathway

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Protein & Cell 2014年第3期5卷 186-193页

作者： Xiaomin Song sheng wang Lin Li State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for BiologicalSciences Chinese Academy of Sciences Shanghai 200031 China

The Wnt signaling pathway plays crucial roles during embryonic development, whose aberration is implicated in a variety of human cancers. Axin, a key component of canonical Wnt pathway, plays dual roles in modulat- ing Wnt signaling： on one hand, Axin scaffolds the ＂l^-catenin destruction complex＂ to promote 13-catenin degradation and therefore inhibits the Wnt signal transduction; on the other hand, Axin interacts with LRP5/6 and facilitates the recruitment of GSK3 to the plasma membrane to promote LRP516 phosphorylation and Wnt signaling. The differential assemblies of Axin with these two distinct complexes have to be tightly controlled for appropriate transduction of the ＂on＂ or ＂off＂ Wnt signal. So far, there are multiple mechanisms revealed in the regulation of Axin activity, such as post- transcriptional modulation, homo/hetero-polymerization and auto-inhibition. These mechanisms may work cooperatively to modulate the function of Axin, thereby playing an important role in controlling the canonical Wnt signaling. In this review, we will focus on the recent progresses regarding the regulation of Axin function in canonical Wnt signaling.

关键词： Wnt signaling Axin post-transcriptionalmodification polymerization auto-inhibition

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GLCM Based Extraction of Flame Image Texture Features and KPCA-GLVQ Recognition Method for Rotary Kiln Combustion Working Conditions

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International Journal of Automation and computing 2014年第1期11卷 72-77页

作者： Jie-sheng wang Xiu-Dong Ren School of Electronic and Information Engineering University of Science and Technology Liaoning

According to the pulverized coal combustion flame image texture features of the rotary-kiln oxide pellets sintering process,a combustion working condition recognition method based on the generalized learning vector(GLVQ) neural network is ***,the numerical flame image is analyzed to extract texture features,such as energy,entropy and inertia,based on grey-level co-occurrence matrix(GLCM) to provide qualitative information on the changes in the visual appearance of the *** the kernel principal component analysis(KPCA) method is adopted to deduct the input vector with high dimensionality so as to reduce the GLVQ target dimension and network scale ***,the GLVQ neural network is trained by using the normalized texture feature *** test results show that the proposed KPCA-GLVQ classifer has an excellent performance on training speed and correct recognition rate,and it meets the requirement for real-time combustion working condition recognition for the rotary kiln process.

关键词： Rotary kiln pellets sintering texture features grey-level co-occurrence matrix kernel principal component analysis generalized learning vector quantization

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Study of eddy current power loss in an RCS vacuum chamber

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Chinese Physics C 2012年第2期36卷 160-166页

作者： XU Shou-Yan wang sheng Institute of High Energy Physics(IHEP) Chinese Academy of SciencesBeijing 100049China

In a Rapid Cycling Synchrotron （RCS）, power loss due to an eddy current on the metal vacuum chamber would cause heating of the vacuum chamber. It is important to study the effect for estimating eddy current induced power loss and temperature growth. Analytical formulas for eddy current power loss for various types of vacuum chambers are derived for dipole and quadrupole repeetively. By using the prototype of dipole of CSNS/RCS, an experiment was done to test the analytical formula. The derived formulas were applied to calculating the eddy current power loss on some special structures of an RCS vacuum chamber.

关键词： eddy current power loss vacuum chamber RCS CSNS

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