检索结果-南通市图书馆

Developing MXenes from Wireless Communication to Electromagnetic Attenuation

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第7期13卷 188-221页

作者： Peng He Mao-sheng Cao Wen-Qiang Cao Jie yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Information Engineering Minzu University of ChinaBeijing 100081People’s Republic of China

There is an urgent global need for wireless communication utilizing materials that can provide simultaneous flexibility and high *** the harmful effects of electromagnetic(EM)radiation from wireless communication is a persistent research hot ***-dimensional(2D)materials are the preferred choice as wireless communication and EM attenuation materials as they are lightweight with high aspect ratios and possess distinguished electronic ***,as a novel family of 2D materials,have shown excellent properties in various fields,owing to their excellent electrical conductivity,mechanical stability,high flexibility,and ease of *** date,research on the utility of MXenes for wireless communication has been actively ***,MXenes have become the leading materials for EM ***,we systematically review the recent advances in MXene-based materials with different structural designs for wireless communication,electromagnetic interference(EMI)shielding,and EM wave *** relationship governing the structural design and the effectiveness for wireless communication,EMI shielding,and EM wave absorption is clearly ***,our review mainly focuses on future challenges and guidelines for designing MXene-based materials for industrial application and foundational research.

关键词： MXene Wireless communication Electromagnetic wave absorption Electromagnetic interference shielding

Experimental,Numerical,and Analytical Studies on the Bending of Mechanically Lined Pipe

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第2期38卷 221-232页

作者： WEI Wen-bin yuan Lin ZHOU Jia-sheng LIU Zheng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China School of Mechanical Engineering Tianjin UniversityTianjin 300072China

Mechanically lined pipe(MLP)is often used for offshore oil and gas transport because of its low cost and corrosion *** installation and operation,the pipe may undergo severe bending deformation,which causes the liner to separate from the outer pipe and buckles,affecting the stability of the whole *** this paper,the buckling response of MLP subjected to bending is investigated to clarify its bending characteristics by employing both experiments,numerical simulation,as theoretical *** types of MLPs were manufactured with GB 45 carbon steel(SLP)and Al 6061(ALP)used as the outer pipe material,*** hydraulic expansion and bending experiments of small-scale MLPs are *** addition to the ovalized shape of the cross-section for the SLP specimens,the copper liner was found to wrinkle on the compressive *** contrast,the liner of ALP remains intact without developing any wrinkling and collapse *** addition,a dedicated numerical framework and theoretical models were also *** was found both the manufacturing and bending responses of the MLP can be well reproduced,and the predicted maximum moment and critical curvatures are in good agreement with the experimental results.

关键词： lined pipe bending nonlinear ring theory buckling plasticity

Effects of thermal aging on Fe ion-irradiated Fe–0.6%Cu alloy investigated by positron annihilation

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第2期28卷 8-11页

作者： yuan-Chao Hu Xing-Zhong Cao Peng Zhang Hidetsugu Tsuchida Qiu Xu Shuo-Xue Jin Er-Yang Lu Yu-Xiao Li run-sheng Yu Bao-Yi Wang Long Wei Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China College of Physical Engineering Zhengzhou UniversityZhengzhou 450001 China Quantum Science and Engineering Center Kyoto UniversityUji 6110011 Japan Research Reactor Institute Kyoto UniversityOsaka 5900494 Japan

Thermal aging effects on surface of 2.5 Me V Fe ion-irradiated Fe–0.6%Cu alloy were investigated using positron annihilation techniques. The samples were irradiated at 573 K to a dose of 0.1 dpa. Their thermal aging was performed at 573 K for 5, 50 and 100 h. From the results of Doppler broadening measurement, an obvious trough could be seen in near-surface region from the S parameters and inflection point form at S–W curves. This indicates changes in the annihilation mechanism of positrons in surface region after thermal aging. Coincident Doppler broadening indicates that the density of Cu precipitates in the thermal aged samples decreased, due to recovery of the vacancies.

关键词： Fe–Cu alloy Positron annihilation Irradiation Thermal aging

Degradation and mineralization of 2-chlorophenol in a single-stage anaerobic fixed-bed bioreactor

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2020年第1期63卷 86-95页

作者： GENG YiKun LI ZhengHao yuan Li PAN XinRong sheng GuoPing CAS Key Laboratory of Urban Pollutant Conversion Department of Applied Chemistry University of Science and Technology of China

Chlorophenols(CPs) have drawn great attention due to their high toxicity and ubiquitous presence in the environment. However,the practical application of anaerobic biodegradation to remove CPs is limited by low degradation rate and incomplete mineralization. This work aims to apply a single-stage anaerobic fixed-bed bioreactor(An FBR) for complete anaerobic dechlorination and mineralization of CPs. Results showed that 2-CP removal efficiency of 99.4%, chemical oxygen demand(COD)removal efficiency of 93.0%, and methane yield of 0.22 L-CH4/g-COD could be obtained for a wide range of 2-CP loading rates(3.6–18.2 mmol L–1 d–1). Nearly complete anaerobic mineralization of 2-CP was achieved even in the absence of co-substrates,thereby greatly reducing the operation cost. This may be partly related to the attached-growth microorganisms in An FBR,allowing a higher biomass concentration and longer biomass retention time for enhanced 2-CP removal. Moreover, 16 S r RNA gene sequence analysis suggests that the An FBR harbored the potential dechlorinators(e.g., Anaeromyxobacter), phenoldegrading microbes(e.g., Comamonas and Syntrophobacter), and methanogens(e.g., Methanobacterium and Methanosaeta)after acclimation, which could cooperate effectively for 2-CP dechlorination and mineralization. Based on the identified intermediates, the possible mineralization pathway of 2-CP was proposed. These findings should be valuable to facilitate the engineering applications of An FBRs for removing CPs from wastewater.

关键词： anaerobic fixed-bed bioreactor chlorophenols degradation pathway intermediates mineralization

Thermochemical Studies of the Toxic Action of Heavy MetalIons on Escherichia coli by Microcalorimetry

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2003年第1期18卷 76-79页

作者：李曦 WuhanUniversityofTechnology

By using an LKB2277 BioActivity Monitor (heat conduction microcalorimeter),stopped flow method,the thermogenetic curves of Escherichia coli growth at 37℃ inhibited by four kinds of heavy metal ions are determined,and parameters such as growth rate constants,inhibitory ratio,half inhibitory concentration *** *** experimental results show that heavy metal ions can inhibit Escherichia coli growth obviously,but low concentration of Cu 2+ has a promoting *** half inhibitory concentrations of Zn 2+ ,Cd 2+ ,Hg 2+ and Cu 2+ are 28.3,10.9,3.19 and 69.6μ*** -1 ,*** from the rate constant,the half inhibitory concentration and the molecular mass,the inhibitory sequence is Hg 2+ >Cd 2+ >Zn 2+ >Cu 2+ .This microclorimetric bioassay for acute cellular toxicity is based on metabolic heat evolution from cultured *** assay is quantitative,inexpensive,and versatile;moreover,toxicological information can be obtained with cell from other species of interest.

关键词： microcalorimetry toxicity measurement heavy metal ions

A New Organo-templated Layered Zincophosphate Synthesized from a Solvothermal System Containing Racemic 1,2-Diaminopropane

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第4期18卷 375-379页

作者： CHEN Wei yuan Hong-ming JIANG Yu-sheng HUO Hua CHEN Jie-sheng State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130023P.R.China

A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structure of the compound was solved by means of single-crystal X-ray diffraction analysis. It crystallized in the monoclinic space group P2_1/c (No. 14) with a= 1.047 0(3) nm, b=0.787 31(18) nm, c=0.662 68(16) nm, β=103.120(5)°, V=0.532 0(2) nm 3 and Z=4. The structure is made up of anionic zincophosphate sheets stacked in an AAAA sequence. The individual sheet contains three- and four-membered rings and the infinite Zn-O-Zn chains can also be envisaged in the sheet. The charge-balancing diprotonated racemic 1,2-diaminopropane cations are sandwiched between the layers, whereas the inorganic layers are stabilized by strong H-bonds formed between the N atoms of the amine and the O atoms in the inorganic sheets.

关键词： Layered zincophosphate X-ray diffraction Crystal structure Racemic system

China cardiovascular diseases report 2018: an updated summary

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2020年第1期17卷 1-8页

作者： Li-yuan MA Wei-Wei CHEN run-Lin GAO Li-sheng LIU Man-Lu ZHU Yong-Jun WANG Zhao-Su WU Hui-Jun LI Dong-Feng GU Yue-Jin YANG Zhe ZHENG sheng-Shou HU National Center for Cardiovascular Diseases BeijingChina Beijing Tiantan Hospital BeijingChina Beijing Anzhen Hospital BeiingChina

1 Introduction Rapid socioeconomic progress has greatly affected the lifestyle in ***,owing to lifestyle changes,urbanization,and accelerated population aging,the risk of cardiovascular diseases(CVD)has *** incidence of CVD has been increasing continuously and this upward trend is projected to continue in the next *** growing burden of CVD has become a major public health issue.

关键词： Cardiovascular diseases Heart failure Risk factors

Monotone Finite Volume Scheme for Three Dimensional Diffusion Equation on Tetrahedral Meshes

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2017年第1期21卷 162-181页

作者： Xiang Lai Zhiqiang sheng Guangwei yuan Department of Mathematics Shandong UniversityJinan 250100P.R.China Laboratory of Computational Physics Institute of Applied Physics and ComputationalMathematicsP.O.Box 8009Beijing 100088P.R.China

We construct a nonlinear monotone finite volume scheme for threedimensional diffusion equation on tetrahedral *** it is crucial important to eliminate the vertex unknowns in the construction of the scheme,we present a new efficient eliminating *** scheme has only cell-centered unknowns and can deal with discontinuous or tensor diffusion coefficient problems on distorted meshes *** numerical results illustrate that the resulting scheme can preserve positivity on distorted tetrahedral meshes,and also show that our scheme appears to be approximate second-order accuracy for solution.

关键词： Monotonicity finite volume scheme diffusion equation tetrahedral meshes

A Conservative Gradient Discretization Method for Parabolic Equations

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

Advances in Applied Mathematics and Mechanics 2021年第1期13卷 232-260页

作者： Huifang Zhou Zhiqiang sheng Guangwei yuan The Graduate School of China Academy of Engineering Physics BeijingChina Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijingChina

In this paper,we propose a new conservative gradient discretization method(GDM)for one-dimensional parabolic partial differential equations(PDEs).We use the implicit Euler method for the temporal discretization and conservative gradient discretization method for spatial *** method is based on a new cellcentered meshes,and it is locally *** has smaller truncation error than the classical finite volume method on uniform *** use the framework of the gradient discretization method to analyze the stability and *** numerical experiments show that the new method has second-order ***,it is more accurate than the classical finite volume method in flux error,L2 error and L¥error.

关键词： Gradient discretization method mass conservation parabolic equations