检索结果-南通市图书馆

Interconnected MXene/Graphene Network Constructed by Soft Template for Multi‑Performance Improvement of Polymer Composites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第8期14卷 164-180页

作者： Liyuan Jin Wenjing cao pei Wang Na Song Peng Ding Research Center of Nanoscience and Nanotechnology College of SciencesShanghai UniversityShanghai 200444

The multi-functionalization of polymer composites refers to the ability to connect multiple properties through simple structural design and simultaneously achieve multi-performance *** large-scale design and mass production to realize the reasonable structure design of multifunctional polymer composites are urgently remaining ***,the multifunctional MXene/graphene/polymer composites with three-dimensional thermally and electrically conductive network structures are fabricated via the utilization of the microstructure of the soft template,and a facile dispersion dip-coating *** a result,the polymer composites have a multiperformance *** the MXene and graphene content of 18.7 wt%,the superior throughplane thermal conductivity of polymer composite is 2.44 W m^(−1)K^(−1),which is 1118%higher than that of the polymer *** electromagnetic interference(EMI)shielding effectiveness of the sample reaches 43.3 dB in the range of *** the mechanical property of the sample has advanced 4 times compared with the polymer *** excellent EMI shielding and thermal management performance,along with the effortless and easy-to-scalable producing techniques,imply promising perspectives of the polymer composites in the next-generation smart electronic devices.

关键词： Structural design MXene/graphene network Soft-template Thermal conductivity Electromagnetic interference shielding

Size-effect on Ni electrocatalyst:The case of electrochemical benzyl alcohol oxidation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 202-208页

作者： jian Zhong Yongli Shen pei Zhu Shuang Yao Changhua An Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials&Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

The nanoparticles(NPs)of Ni with different sizes endows its distinctive physical and chemical properties,which represents a typical strategy for the development of high-performance ***,the size effect of metallic Ni-NPs on electrocatalytic performance remains ***,the Ni-NPs with different sizes supported on nitrogen doped carbon(NC)has been synthesized by controlling the pyrolysis temperature,leading to the synthesis of Ni@NC-500(8.3 nm),Ni@NC-280(1.9 nm)and Ni@NC-200(1.0 nm).The electrooxidation of benzyl alcohol(BA)over these nanocatalysts shows the yield of benzoic acid was 99%,82%,55%on Ni@NC-280,Ni@NC-200 and Ni@NC-500,*** experimental and theoretical simulation demonstrate that the difference in the adsorption strength of reactant molecules by Ni-NPs is responsible for their different performance,where the Ni@NC-280 exhibits an optimal adsorption configuration between Ni@NC-280 electrode and *** work provides a new angle for designing and synthesizing efficient electrocatalysts,which may be extended to the exploration of various promising electrocatalytic systems.

关键词： size effect electro-oxidation Ni nanoparticles benzyl alcohol

SAR image denoising based on wavelet-fractal analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2007年第1期18卷 45-48页

作者： Zhao jian cao Zhengwen Zhou Mingquan School of Electronics and Information Northwestern Polytechnical Univ. Xi'an 710072 E R. China School of Information Science and Technology Northwest Univ. Xi'an 710069 E R. China

Wavelet-fractal based SAR （synthetic aperture radar） image processing is one of the advanced technologies in image processing. The main concept of analysis is that after wavelet transformation, multifractal spectrum of the signal is different from that of noise. This difference is used to alleviate the noise produced by SAR *** method to denoise SAR image using the process based on wavelet-fractai analysis is discussed in detail. Essentially, the present method focuses on adjusting the Hoelder exponent α of multifractal spectrum. After simulation, α should be adjusted to 1.72-1.73. The more the value of α exceeds 1.73, the less distinctive the edges of SAR image become. According to the authors denoising is optimal at α=1.72-1.73. In other words, when α =1.72-1.73, a smooth and denoised SAR image is produced.

关键词： Synthetic aperture radar image Wavelet Multifractal analysis Denoising Hoelder exponent

Electrochemical Behavior of CoSb_3-based Electrodes Using Binary PAni/PVDF Binder

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2007年第1期23卷 142-144页

作者： jian XIE Xinbing ZHAO Gaoshao cao Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

The polyaniline （PAni）/polyvinylidene fluoride （PVDF） hybrid was served as a novel binder for CoSb3-based alloy electrode. The effect of PAni content on the electrochemical performances of the alloy electrode was investigated. It was found that the CoSb3 electrode using the binary PAni/PVDF binder exhibits higher reversible capacity than that using the single PVDF binder, especially in the initial cycles. As a result, the PAni/PVDF hybrid could be a promising binder for the alloy electrode.

关键词： PAni/PVDF binder CoSb3 electrode Electrochemical behavior Lithium ion batteries

Effects of source facies and maturity on individual carbon isotopic compositions of oil

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第5期15卷 210-221页

作者： Jingkun Zhang jian cao Baoli Xiang State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China MOE Key Laboratory of Surficial Geochemistry School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Research Institute of Experiment and Testing PetroChina Xinjiang Oilfield CompanyKaramayXinjiang 834000China

Carbon isotopes have been used extensively in tracing the sources of ***,primary source facies and secondary alteration controls on oil isotopic compositions have not been well resolved,resulting in application uncertainties.A case study was undertaken for an alkaline lacustrine oil system in a lower Permian formation in the Junggar Basin,NW *** indicate that increasing maturity causes the carbon isotopic composition to become heavier for only short–middle-chain compounds,whereas source facies-related carbon assimilation controls the compositions of short-,middle-,and long-chain *** particular,light-carbon assimilation during organic-matter degradation makes the isotopic composition lighter,whereas heavy carbon from the water mass makes it ***,oils in this study area were divided into Type U and Type N oils based on individual compound carbon isotopic compositions,reflecting the difference in source facies in a highly saline and reducing stratified water *** results provide a better understanding of the controls on carbon isotopes in oil in sedimentary basins,reducing the uncertainty in oil–source correlation and addressing the origin of oil.

关键词： Carbon assimilation Water stratification Carbon isotopes Alkaline lacustrine Junggar Basin

High-loading Co-doped NiO nanosheets on carbon-welded carbon nanotube framework enabling rapid charge kinetic for enhanced supercapacitor performance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 240-247页

作者： Hao Xu Yufang cao Yong Li pei cao Dandan Liu Yongyi Zhang Qing wen Li School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina Division of Nanomaterials and jiangxi Key Lab of Carbonene Materials Suzhou Institute of Nano-Tech and Nano-BionicsNanchangChinese Academy of SciencesNanchang 330200JiangxiChina School of Materials Science and Engineering Nanchang UniversityNanchang 330031JiangxiChina

Developing high power and energy supercapacitors(SCs)is a long-pursued goal for the application in transportation and energy storage ***,a rationally-designed Co-doped nickel oxide nanosheets@carbon-welded carbon nanotube foam(Co-doped NiO@WCNTF)as freestanding electrode is successfully prepared for high power and energy *** WCNTF framework with high specific surface area provides three dimensional highly conductive network for fast charge transport and ensures high loading of active materials(9.2 mg/cm2).Moreover,porous Co-doped NiO nanosheets uniformly anchored on the WCNTF framework enable rapid charge kinetics due to the high intrinsic conductivity of Co-doped Ni O nanosheets and their good contact with conductive WCNTF *** a result,the unique integrated electrode with 3D architecture exhibits an ultrahigh specific capacitance of 11.45 F/cm2 at 5 mA/cm2,outstanding rate capability(11.45 F/cm2 at 5 mA/cm2 and a capacitance retention of 86.2%at 30 mA/cm2)and good cycling stability,suggesting great potential for high performance supercapacitor.

关键词： Carbon nanotube foam Pseudocapacitors Co-doped NiO nanosheets Freestanding electrode

在线全文

学校读者我要写书评

暂无评论

Finite NPDM-groups

Acta Mathematica Sinica,English Series 2021年第2期37卷 306-314页

作者： jian Ji cao Xiu Yun GUO School of Applied Mathematics Shanxi University of Finance and EconomicsTaiyuan 030006P.R.China Department of Mathematics Shanghai UniversityShanghai 200444P.R.China

In this paper the classification is given for finite groups in which the normalizer of every non-normal cyclic subgroup of order divided by the minimal prime of |G| is a maximal subgroup.

关键词： Normalizer cyclic subgroup maximal subgroup

Improved 4H-SiC UMOSFET with super-junction shield region

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第5期30卷 694-700页

作者： pei Shen Ying Wang Xing-Ji Li jian-Qun Yang Cheng-Hao Yu Fei cao Key Laboratory of RF Circuits and Systems Ministry of EducationHangzhou Dianzi UniversityHangzhou 310018China National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of TechnologyHarbin 150080China

This article investigates an improved 4H-SiC trench gate metal–oxide–semiconductor field-effect transistor(MOSFET)(UMOSFET)fitted with a super-junction(SJ)shielded *** modified structure is composed of two n-type conductive pillars,three p-type conductive pillars,an oxide trench under the gate,and a light n-type current spreading layer(NCSL)under the *** n-type conductive pillars and the light n-type current spreading layer provide two paths to and promote the diffusion of a transverse current in the epitaxial layer,thus improving the specific on-resistance(R_(on,sp)).There are three p-type pillars in the modified structure,with the p-type pillars on both sides playing the same *** p-type conductive pillars relieve the electric field(E-field)in the corner of the trench ***-dimensional simulation(silvaco TCAD)indicates that Ron,sp of the modified structure,and breakdown voltage(V_(BR))are improved by 22.2%and 21.1%respectively,while the maximum figure of merit(FOM=V_(BR)^(2)/R_(on,sp)) is improved by 79.0%.Furthermore,the improved structure achieves a light smaller low gate-to-drain charge(Q_(gd))and when compared with the conventional UMOSFET(conventional-UMOS),it displays great advantages for reducing the switching energy *** advantages are due to the fact that the p-type conductive pillars and n-type conductive pillars configured under the gate provide a substantial charge balance,which also enables the charge carriers to be extracted *** the end,under the condition of the same total charge quantity,the simulation comparison of gate charge and OFF-state characteristics between Gaussdoped structure and uniform-doped structure shows that Gauss-doped structure increases the V_(BR)of the device without degradation of dynamic performance.

关键词： breakdown voltage specific on-resistance silicon carbide switching energy loss super-junction(SJ) trench gate MOSFET

Characteristics of Welding Crack Defects and Failure Mode in Resistance Spot Welding of DP780 Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第10期23卷 1104-1110页

作者： Xiao-pei WANG Yong-qiang ZHANG jian-bin JU jian-qiang ZHANG jian-wei YANG Shougang Research Institute of Technology Beijing 100043 China College of Science China University of Petroleum (Beijing) Beijing 102249 China

The mechanical properties of welded joints in resistance spot welding of DP780 steel were tested,and three different types of welding cracks in welded joints were investigated by optical microscopy,scanning electron microscopy and electron back-scattered ***,the failure mode of the welded joints in shear tensile test was *** is found the shear tensile strength of welded joints can be greatly improved by adding preheating current or tempering *** surface crack in welded joint is intergranular fracture,while the inner crack in welded joint is transgranular fracture,and the surface crack on the edge of the electrode imprint can be improved by adding preheating current or tempering *** traditional failure mode criterion advised by American Welding Society is no longer suitable for DP780 spot welds and the critical nugget size suggested by Pouranvari is overestimated.

关键词： resistance spot welding mechanical property crack defect failure mode DP780 steel