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Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

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Nano Research 2025年第1期18卷 508-519页

作者： Ke Jiang Zhi Chen Ji yu Chen Zheng Shan Huang Ming Wang Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

Skeleton-trimmed leggero pillar[5]arene:Amorphous and non-porous material for highly-selective haloalkane separation

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Chinese Chemical Letters 2023年第2期34卷 1-2页

作者： Xiao-yong yu yong Chen College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin 300071 China

Halogenated alkanes are high-value chemical feedstocks in synthetic chemistry and petrochemical industry[1,2].Therefore,the separation of halogenated alkane isomers is one of the necessary chemical processes in the petrochemical ***,the isomers normally have close boiling points due to the same molecular weight and similar chemical structure,which makes it difficult to separate the isomers with high purity by traditional methods such as ***,it is of great significance for petrochemical industry to find an efficient and energy-saving scheme to separate halogenated alkanes isomers.

关键词： isomers separation alkanes

Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

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Nano Research 2025年第1期18卷 675-683页

作者： Xue Li Yanan Guo Guoying Tan Qingyi Liu Nan Song yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

A Novel Self-Supervised Learning Network for Binocular Disparity Estimation

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 209-229页

作者： Jiawei Tian yu Zhou Xiaobing Chen Salman A.AlQahtani Hongrong Chen Bo Yang Siyu Lu Wenfeng Zheng Department of Computer Science and Engineering Major in Bio Artificial IntelligenceHanyang UniversityAnsan-si15577Republic of Korea School of Electrical and Computer Engineering Louisiana State UniversityBaton RougeLA 70803USA Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11574Saudi Arabia School of Automation University of Electronic Science and Technology of ChinaChengdu610054China

Two-dimensional endoscopic images are susceptible to interferences such as specular reflections and monotonous texture illumination,hindering accurate three-dimensional lesion reconstruction by surgical *** study proposes a novel end-to-end disparity estimation model to address these *** approach combines a Pseudo-Siamese neural network architecture with pyramid dilated convolutions,integrating multi-scale image information to enhance robustness against lighting *** study introduces a Pseudo-Siamese structure-based disparity regression model that simplifies left-right image comparison,improving accuracy and *** model was evaluated using a dataset of stereo endoscopic videos captured by the Da Vinci surgical robot,comprising simulated silicone heart sequences and real heart video *** results demonstrate significant improvement in the network’s resistance to lighting interference without substantially increasing ***,the model exhibited faster convergence during training,contributing to overall performance *** study advances endoscopic image processing accuracy and has potential implications for surgical robot applications in complex environments.

关键词： Parallax estimation parallax regression model self-supervised learning Pseudo-Siamese neural network pyramid dilated convolution binocular disparity estimation

ETHYLENE POLYMERIZATION AND COPOLYMERIZATION WITH POLAR MONOMERS BY A NEUTRAL NICKEL CATALYST COMBINED WITH CO-CATALYST OF Ni(COD)_2 OR AL(i-Bu)_3

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Chinese Journal of Polymer Science 2005年第3期23卷 301-310页

作者： yu-huaShan 孙俊全 yong-jinXu yong-gangCui FengLin DepartmentofChemicalEngineering CollegeofMaterial＆ChemicalEngineeringZhejiangUniversityHangzhou310027China

A neutral nickel(Ⅱ)catalyst D,{[O-(3-cyclohexyl)(5-Cl)C_6H_2-ortho-C(H)=N-2,6-C_6H_3(i-Pr)_2]Ni(Ph_3P)(Ph)}hasbeen synthesized and characterized by IH-NMR,FTIR and elemental *** results indicate that Al(i-Bu)_3 is aneffective cocatalyst for the neutral nickel *** bis(1,5-cyclooctadiene)nickel(0)[Ni(COD)_2]or Al(i-Bu)_3 as a co-catalyst,the neutral nickel catalyst D is active for ethylene polymerisation and copolymerisation with polar monomers(tert-butyl 10-undecenoate(BU),methyl 10-undecenoate(MU),allyl alcohol(AA)and 4-penten-1-ol(PO))under mild *** resulting polymers were characterized by (?)H-NMR,FTIR,DSC,and *** the comparative studies,Ni(COD)_2 ismore active than Al(i-Bu)_3 for ethylene homopolymerization,while Al(i-Bu)_3 is more effective than Ni(COD)_2 for ethylenecopolymerisation with polar *** polymerization parameters which affect both the catalytic activity and propertiesof the resulting polyethylene were investigated in *** the conditions of 20 μmol catalyst D and Ni(COD)_2/D=3(molar ratio) in 30 mL toluene solution at 45℃,12×105 Pa ethylene for 20 min,the polymerization activity reaches ashigh as 7.29×105 gPE.(***.h)^(-1) and M_η,is 7.16×104 ***^(-1).For ethylene copolymerization with polar monomers,theeffect of comonomer concentrations was *** high as 0.97 mol% of MU,1.06 mol% of BU,1.04 mol% of AA and1.37 mol% of PO were incorporated into the polymer,respectively,catalyzed by D/Al(i-Bu)_3 system.

关键词： Neutral nickel catalyst Polar monomer Copolymerization Polyethylene Functional polyolefins.

Tin recovery from a low-grade tin middling with high Si content and low Fe content by reduction–sulfurization roasting with anthracite coal

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 210-220页

作者： Jing-cheng Wang Lei Li yong yu State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction of Ministry of Education Kunming University of Science and TechnologyKunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

A new method for separating and recovering tin from a low-grade tin middling with high Si content and low Fe content by roasting with anthracite coal was researched by studying the reaction mechanism and performing an industrial test,in which the Sn was sulfurized into SnS(g)and then collected using a dust *** Fe–Sn alloy may be formed at roasting temperatures above 950°C,and like the roasting temperature increases,the Sn content and Sn activity in this Fe–Sn alloy ***,more FeS can be formed at higher temperatures and then the formation of FeO–FeS with a low melting point is promoted,which results in more serious sintering of this low-grade tin *** from the thermodynamics and kinetics points of view,the volatilization of the Sn decreases at extremely high roasting *** results of the industrial test carried out in a coal-fired rotary kiln show that the Sn volatilization rate reaches 89.7%and the Sn is concentrated in the collected dust at a high level,indicating that the Sn can be effectively extracted and recovered from the low-grade tin middling with a high Si content and low Fe content through a reduction–sulfurization roasting process.

关键词： low-grade tin middling tin recovery roasting process Fe-Sn alloy resource recycling

Preorganized cationic pillararene as efficient carriers for intracellularly delivering native proteins

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Chinese Chemical Letters 2023年第5期34卷 1-2页

作者： Hong-Mei yu Xiao-yong yu yong Chen School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Cosmetics Tech Center Chinese Academy of Inspection and Quarantine Cosmetics Tech CenterBeijing 100176China College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin 300071China

As a novel clinical treatment technology,intracellular protein delivery has attracted great attention because of its ability to specifically manipulate cellular functions and accurately treat diseases by acting on int... 详细信息

关键词： diseases clinical cationic

Positive Shifts of the Reduction Potentials of C_(60) by Substitution of Cyanogens

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Chinese Chemical Letters 1998年第1期9卷 99-101页

作者： Lou Zhen FAN yong Fang LI Feng Ying LI yu Liang LI dao Ben ZHU(Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080) Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

The electrochemical properties of a new derivative of C60 were investigated by cyclic voltammetry. It was found that the derivative was reduced at a more positive potential than C60,reflecting its significance to acce... 详细信息

关键词： C_(60) derivative electrochemical properties NIR absorption bands

Variable selection via generalized SELO-penalized linear regression models

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Applied Mathematics(A Journal of Chinese Universities) 2018年第2期33卷 145-162页

作者： SHI yue-yong CAO yong-xiu yu Ji-chang JIAO yu-ling School of Econoraics and Management China University of GeosciencesWuhan 430074China School of Statistics and Mathematics Zhongnan University of Economics and LawWuhan 430073China Center for Resources and Environmental Economic Research China University of GeosciencesWuhan 430074China

The seamless-L0 （SELO） penalty is a smooth function on [0, ∞） that very closely resembles the L0 penalty, which has been demonstrated theoretically and practically to be effective in nonconvex penalization for variable selection. In this paper, we first generalize SELO to a class of penalties retaining good features of SELO, and then propose variable selection and estimation in linear models using the proposed generalized SELO （GSELO） penalized least squares （PLS） approach. We show that the GSELO-PLS procedure possesses the oracle property and consistently selects the true model under some regularity conditions in the presence of a diverging number of variables. The entire path of GSELO-PLS estimates can be efficiently computed through a smoothing quasi-Newton （SQN） method. A modified BIC coupled with a continuation strategy is developed to select the optimal tuning parameter. Simulation studies and analysis of a clinical data are carried out to evaluate the finite sample performance of the proposed method. In addition, numerical experiments involving simulation studies and analysis of a microarray data are also conducted for GSELO-PLS in the high-dimensional settings.

关键词： continuation coordinate descent BIC LLA oracle property SELO smoothing quasi-Newton