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Polymer-bubbling for one-step synthesis of three-dimensional cobalt/carbon foams against electromagnetic pollution

Journal of Materials Science & Technology 2021年第34期93卷 7-16页

作者： fengyuan wang ping xu Ning Shi Liru Cui Yahui wang Dawei Liu Honghong Zhao Xijiang Han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Constructing three-dimensional(3D)foam-like structure in magnetic metal/carbon composites is regarded as a promising pathway to reinforce their electromagnetic(EM)***,a nitrateassisted polymer-bubbling strategy is reported for the synthesis of Co/carbon foams,which is simply accomplished by direct pyrolyzing the mixture of polyvinylpyrrolidone(PVP)and cobalt nitrate hexahydrate(Co(NO_(3))_(2)·6 H_(2) O).Co(NO_(3))_(2)·6H_(2)O not only plays as the source of Co nanoparticles,but also accounts for the formation of 3D microstructure through releasing *** manipulating the weight ratio of Co(NO_(3))_(2)·6H_(2)O to PVP,the chemical composition,microstructure,and EM properties of these composites can be easily *** the weight ratio reaches 1.5,the resultant composite displays good microwave absorption performance,whose reflection loss intensity and effective absorption bandwidth are superior to those of many common Co/C *** analysis reveals that such architecture is greatly helpful to establish cross-linked conductive networks in the wax matrix,resulting in powerful dielectric loss under low absorber ***,3D microstructure is also beneficial for multiple reflections that equal to extend the transmission path of incident EM *** synthesis strategy and desirable properties of these magnetic carbon foams may render them as the low-cost substitute of 3D graphene for the application against EM pollution.

关键词： Polymer-bubbling Three-dimensional foams Co/C composites Electromagnetic pollution Microwave absorption

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Composition Optimization and Microstructure Design in MOFs-Derived Magnetic Carbon-Based Microwave Absorbers:A Review

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Nano-Micro Letters 2021年第12期13卷 383-415页

作者： Honghong Zhao fengyuan wang Liru Cui Xianzhu xu Xijiang Han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China

Magnetic carbon-based composites are the most attractive candidates for electromagnetic(EM)absorption because they can terminate the propagation of surplus EM waves in space by interacting with both electric and magnetic ***-organic frameworks(MOFs)have demonstrated their great potential as sacrificing precursors of magnetic metals/carbon composites,because they provide a good platform to achieve high dispersion of magnetic nanoparticles in carbon ***,the chemical composition and microstructure of these composites are always highly dependent on their precursors and cannot promise an optimal EM state favorable for EM absorption,which more or less discount the superiority of MOFs-derived *** is hence of great importance to develop some accompanied methods that can regulate EM properties of MOFs-derived magnetic carbon-based composites e *** review comprehensively introduces recent advancements on EM absorption enhancement in MOFs-derived magnetic carbon-based composites and some available strategies *** addition,some challenges and prospects are also proposed to indicate the pending issues on performance breakthrough and mechanism exploration in the related field.

关键词： Magnetic carbon-based composites Metal–organic frameworks Composition optimization Microstructure design EM absorption enhancement

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Preparation and characterization of oil-soluble In_2O_3 nanoparticles and In_2O_3–SnO_2 nanocomposites and their calcined thin films

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International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 543-548页

作者： Li-ping wang xu-dong xu Jia-xing wang Department of Materials Physics and Chemistry School of Materials Science and Engineering University of Science and Technology Beijing

Oil-soluble In2O3 nanoparticles and In2O3-SnO2 nanocomposites were prepared in oleylamine via decomposition of metal acety- lacetonate precursors. Thin films of In2O3 and In2O3-SnO2 were obtained by spin-coating solutions of the oil-soluble In2O3 nanoparticles and In2O3-SnO2 nanocomposites onto substrates and then calcining them. Transmission electron microspectroscopy, scanning electron mi- crospectroscopy, atomic force microspectroscopy, X-ray diffraction, ultraviolet-visible absorption, and photoluminescence spectroscopy were used to investigate the properties of the nanoparticles and thin films. The In2O3 nanoparticles were cubic-phased spheres with a diame- ter of-8 nm; their spectra exhibited a broad emission peak centered at 348 nm. The In2O3-SnO2 nanocomposites were co-particles composed of smaller In2O3 particles and larger SnO2 particles; their spectra exhibited a broad emission peak at 355 nm. After the In2O3-SnO2 nano- composites were calcined at 400℃, the obtained thin films were highly transparent and conductive, with a thickness of 30-40 nm; the sur- faces of the thin films were smooth and crack-free.

关键词： indium trioxide tin dioxide nanoparficles nanocomposites thin films calcination

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Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation

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Journal of Materials Science & Technology 2019年第5期35卷 812-816页

作者： Shao-ping wang Jian xu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China University of Chinese Academy of Sciences 19(A) Yuquan Road Beijing 100049 China

With instrumented nanoindentation, incipient plasticity of two as-cast BCC TiZrNbTa and TiZrNbTaMo high-entropy alloys(HEAs) are investigated in terms of pop-in events during loading, to characterize the dislocation behavior in these solid-solution alloys. It is shown that the maximum shear stress (max)required for dislocation nucleation is determined to be 1/16-1/12 and 1/18-1/14 of shear modulus for the TiZrNbTa and TiZrNbTaMo HEAs, respectively, which is nearly comparative to the theoretical shear stress of these alloys. The activation volumes of dislocation nucleation the TiZrNbTa and TiZrNbTaMo HEAs are determined to be 1.2 b^3 for and 1.3 b^3, respectively, which is substantially irrespective of alloying with Mo. Furthermore, activation volumes of these two HEAs are on the order of cubic burger’s vector and only one-third of the value for TiZrHfNb HEA, suggesting that a heterogeneous nucleation of dislocation took place in a way of direct atom-vacancy exchange, rather than of the cooperative motion of several atoms. These findings reveal the unique feature in deformation of BCC solid-solution complex alloys.

关键词： High-entropy alloys Nanoindentation Refractory metals BCC phase Incipient plasticity

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Intelligent hydrogels for treating malignant melanoma

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Engineered Regeneration 2024年第3期5卷 295-305页

作者： Guopu Chen Xiyu wang Jiaye Li Ye xu Yue Lin fengyuan wang Department of Burns and Plastic Surgery Nanjing Drum Tower HospitalSchool of MedicineSoutheast UniversityNanjing 210009China Department of Dermatology Zhongda HospitalSchool of MedicineSoutheast UniversityNanjing 210009China

Malignant melanoma(MM)is an extremely aggressive and fatal form of skin cancer that primarily affects the bottom layer of the epidermis and is associated with poor clinical ***-stage MM is typically treated through surgical removal,while chemotherapy and radiotherapy are common conventional treatment options that come with harmful side *** therapies such as immunotherapy,photodynamic therapy,biologic therapy,and photothermal therapy present hopeful options for treatment due to their effective and secure drug delivery *** address the limitations of current treatment options,advanced methods of drug delivery for subcutaneous MM are being developed,with hydrogels emerging as a promising *** date,significant advancements have been made in the treatment of MM through the use of hydrogels-based drug delivery systems through focal plastering,injection,implantation,and *** research on hydrogel-based drug delivery systems that integrate multiple therapies for the treatment of subcutaneous MM is discussed in this review.

关键词： Intelligent Hydrogel Microneedle Drug delivery system Malignant melanoma

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Development and application of moment method on nanoparticles evolution due to coagulation and deposition

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Journal of Hydrodynamics 2019年第5期31卷 1011-1020页

作者： Guang-ping xu Jia-song wang School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this study,the Taylor-series expansion method of moments is developed to describe the dynamic behaviour of nanoparticles considering both the effects of coagulation and deposition in closed environments,where the two effects have always been studied separately *** with traditional methods of moments,the new method could give more accurate results for solving the general dynamics *** addition,moment equations with respect to coagulation and deposition considering the fractal dimension(Df)of particles are acquired,and the results are compared with experimental data and are more accurate than the simulation results under the assumption of spherical *** new dynamic model could be applied in more real conditions with different microstructures of *** decreasing Dt,the particle number concentration decreases more rapidly,additionally,Df has a relatively greater effect on the agglomeration of smaller particles under the same initial ***,the effect of the initial number concentration on coagulation is also *** results show that a higher initial number concentration or a smaller particle size could have a greater effect of coagulation on the evolution of particles.

关键词： Moment method nanoparticle deposition coagulation fractal dimension

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A screw dislocation near one open inhomogeneity and another closed inhomogeneity both permitting constant interior stresses

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Applied Mathematics and Mechanics(English Edition) 2021年第2期42卷 173-182页

作者： xu wang ping YANG P.SCHIAVONE School of Mechanical and Power Engineering East China University of Science and Technology Department of Mechanical Engineering University of Alberta Innovation Centre for Engineering

We prove that the interior stresses within both a non-parabolic open inhomogeneity and another interacting non-elliptical closed inhomogeneity can still remain constant when the matrix is simultaneously under the action of a screw dislocation and uniform remote anti-plane *** constancy of interior stresses is realized through the construction of a conformal mapping function for the doubly connected domain occupied by the surrounding *** mapping function is endowed with the information describing the screw dislocation via the incorporation of two specifically defined logarithmic *** constant interior stress fields are observed to be independent of the specific open and closed shapes of the two inhomogeneities and the existence of the screw *** contrast,the existence of the neighboring screw dislocation significantly affects the open and closed shapes of the two inhomogeneities.

关键词： constant stress field open inhomogeneity closed inhomogeneity screw dislocation conformal mapping

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基于“微生物-肠-脑轴”探讨补肾通腑方对APP/PS1小鼠肠道菌群及LPS/TLR4/NF-κB通路的影响

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中国药理学通报 2025年第1期41卷 171-178页

作者：王旭张杰赵敏宋晓雨段建平河南中医药大学第一附属医院脑病科河南郑州450000 河南中医药大学第一临床医学院河南郑州450000 中西医防治重大疾病河南省协同创新中心河南郑州450046

目的探讨补肾通腑方调控肠道菌群,改善阿尔茨海默病(Alzheimer’s disease,AD)模型小鼠学习记忆能力的作用机制。方法以APP/PS1小鼠为研究对象,给予补肾通腑方治疗8周,采用Morris水迷宫法观察小鼠空间学习记忆能力变化;16S rDNA检测小... 详细信息

目的探讨补肾通腑方调控肠道菌群,改善阿尔茨海默病(Alzheimer’s disease,AD)模型小鼠学习记忆能力的作用机制。方法以APP/PS1小鼠为研究对象,给予补肾通腑方治疗8周,采用Morris水迷宫法观察小鼠空间学习记忆能力变化;16S rDNA检测小鼠肠道菌群丰度、多样性变化;HE染色观察海马病理形态学变化;免疫荧光检测海马区小胶质细胞活化情况;Western blot检测TLR4、NF-κB、IL-6等炎症因子表达。结果与模型组相比,补肾通腑方可以缩短AD模型小鼠逃避潜伏期、游泳路径,增加跨越平台次数(P<0.05),提升肠道菌群多样性,调节肠道菌群丰度,促进海马神经元细胞损伤修复,降低iNOS/Iba1共表达,提高Arg1/Iba1共表达(P<0.01),促进小胶质细胞从M1型向M2型转化,下调TLR4、NF-κB、IL-6等促炎因子的表达。结论补肾通腑方改善AD模型小鼠学习记忆能力的作用机制可能与调节肠道菌群介导的LPS/TLR4/NF-κB通路,从而抑制促炎型小胶质细胞活化、减轻中枢神经系统炎症、改善海马区神经元细胞损伤有关。

关键词：阿尔茨海默病补肾通腑方肠道菌群 LPS/TLR4/NF-κB通路 16S rDNA 微生物-肠-脑轴

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Hot Deformation and Modeling of Flow Stress for a Ti-containing HSLA Steel

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Journal of Materials Science & Technology 1998年第5期14卷 419-424页

作者： xu, Yourong Hou, Dahua wang, Deying xu, W-ping Shanghai Univ Sci & Technol Sch Mat Sci & Engn Shanghai 201800 Peoples R China

Single stage and double-stage interrupted hot compression tests for simulating hot rolling have been carried out for a Ti-containing HSLA steel (10Ti). Physical simulation of hot rolling was in progress utilizing a Thermecmastor-Z simulator in 850-1150 degree C and strain rate of 0.1-60 s** minus **1. A model for residual strain ratio lambda was designed, and a model of flow stress considering residual strain has been obtained. The hot deformation behavior at various strain rate has also been studied. (Edited author abstract) 13 Refs.

关键词： Steel

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GLOBALLY ASYMPTOTICALLY STABLE FORMATION CONTROL OF THREE AGENTS

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Journal of Systems Science & Complexity 2012年第6期25卷 1068-1079页

作者： Qin wang Yu-ping TIAN Yaojin xu School of Automation Southeast University

This paper considers the formatiomshape control of three agents in the plane. By adding an adaptive perturbation to any agent＇s movement direction, a novel control strategy is proposed. It is shown that the proposed novel control law can not only guarantee the global asymptotical stability of the desired formation shape, but also ensure the collision avoidance of agents between each other. Simulation results are provided to illustrate the effectiveness of the control algorithm.

关键词： Formation control global asymptotic stability multi-agents system.

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