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Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures

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Journal of Materials Science & technology 2019年第8期35卷 1523-1531页

作者： Minqiang Gao Zongning Chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024 China Engineering Institute Bohai UniversityJinzhou 121013 China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204 China

B4Cp/6061Al composites have become important structural and functional materials and can be fabricated by powder metallurgy and subsequent hot rolling. In this work, the effects of the hot-pressing temperature on microstructures and mechanical behaviors of the B4Cp/6061Al composites were investigated. The results showed that compared with the T4 heat treated B4Cp/6061Al composite hot pressed at 560℃, the yield strength and failure strain of the composites hot pressed at 580℃ were increased to 235 MPa and 18.4%, respectively. This was associated with the interface bonding strength between the B4C particles and the matrix. However, the reaction products, identified to be MgAl2O4 phases, were detected in the composites hot pressed at 600℃. The formation of the MgAl2O4 phases resulted in the Mg depletion, thus reducing the yield strength to 203.5 MPa after the T4 heat treatment due to the effect of the solid solution strengthening being weakened. In addition, the variation of hardness and electrical conductivity was mainly related to the Mg content in the matrix. Based on the as-rolled microstructures observed by SEM, SR-μCT and fracture surfaces, the deformation schematic diagram was depicted to reflect the tensile deformation process of the composites.

关键词： B4Cp/6061Al composite Hot-pressing temperature Microstructure Mechanical behavior Reaction product

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A stitching method for AFM based large scale scanning with high resolution 19

A stitching method for AFM based large scale scanning with h...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Zhao, Sheng Yang, Qinmin State Key Laboratory of Industrial Control Technology Department of Control Science and Engineering ZheJiang University Hangzhou Zhejiang310027 China

ISBN: (纸本)9783902823625

Internal nonlinearities within piezoelectric actuators of Atomic Force Microscopes (AFM) still pose a great challenge for practicers in the area of nanotechnology. Especially, when topography of a large scale area is required along with high resolution, traditional scanning protocol will deteriorate the distortion of images. In this paper, a novel block scan and stitching method is proposed to mitigate such phenomena. By dividing the whole area into blocks and integrating them subsequently, creep, hysteresis and thermal drift within images can be reduced largely. Moreover, the whole procedure is executed in an automatic manner without human's intervention. Its feasibility is also verified by real experimental results. © IFAC.

关键词： Piezoelectric actuators

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Allelopathic effect of sargassum fusiforme on growth of karenia mikimotoi

Allelopathic effect of sargassum fusiforme on growth of kare...

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2013 2nd International Conference on Sustainable Energy and Environmental engineering, ICSEEE 2013

作者： Yuan, Chun Ying Zhao, Yang Yang, Shuo Cui, Qing Man Tianjin Key Laboratory for Marine Chemistry and Resource College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

ISBN: (纸本)9783038350224

Allelopathic effect of Sargassum fusiforme on growth of Karenia mikimotoi was studied, the results showed that: fresh tissue and dry powder of S. fusiforme had a good inhibitory effect on the K. mikimotoi growth, and enhanced with the increase of mass *** concentration dependence relationship was existed between S. fusiforme and K. mikimotoi. Aqueous extract of S. fusiforme had a promoting effect on K. mikimotoi at low concentration, and showed obvious inhibition at high concentration, in the 1.6 g/L of extract group, K. mikimotoi died on day 8. It illustrated that the inhibition of S. fusiforme on K. mikimotoi was implemented mainly by its soluble components. © (2014) Trans Tech Publications, Switzerland.

关键词： Sustainable development

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Development of database of real-world diesel vehicle emission factors for China

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Journal of Environmental Sciences 2015年第5期27卷 209-220页

作者： Xianbao Shen Zhiliang Yao Qiang Zhang David Vance Wagner Hong Huo Yingzhi Zhang Bo Zheng Kebin He State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University School of Food and Chemical Engineering Beijing Technology and Business University Ministry of Education Key Laboratory for Earth System Modeling Center for Earth System Science Tsinghua University International Council on Clean Transportation (ICCT) Institute of Energy Environment and Economy Tsinghua University State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Tsinghua University

A database of real-world diesel vehicle emission factors, based on type and technology, has been developed following tests on more than 300 diesel vehicles in China using a portable emission measurement system. The database provides better understanding of diesel vehicle emissions under actual driving conditions. We found that although new regulations have reduced real-world emission levels of diesel trucks and buses significantly for most pollutants in China, NOx emissions have been inadequately controlled by the current standards, especially for diesel buses, because of bad driving conditions in the real world. We also compared the emission factors in the database with those calculated by emission factor models and used in inventory studies. The emission factors derived from COPERT（Computer Programmer to calculate Emissions from Road Transport） and MOBILE may both underestimate real emission factors, whereas the updated COPERT and PART5（Highway Vehicle Particulate Emission Modeling Software） models may overestimate emission factors in China. Real-world measurement results and emission factors used in recent emission inventory studies are inconsistent,which has led to inaccurate estimates of emissions from diesel trucks and buses over recent years. This suggests that emission factors derived from European or US-based models will not truly represent real-world emissions in China. Therefore, it is useful and necessary to conduct systematic real-world measurements of vehicle emissions in China in order to obtain the optimum inputs for emission inventory models.

关键词： Diesel vehicle Emission factor Portable emission measurement system Database China

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Supramolecular fabrication of hyperbranched polyethyleneimine toward nanofiltration membrane for efficient wastewater purification

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SusMat 2021年第4期1卷 558-568页

作者： Junyuan Xia Jincui Gu Peng Xiao Chang Zhang Luke Yan Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Material Technology and EngineeringChinese Academy of ScienceNingboChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina Polymer Materials&Engineering Department School of Materials Science&EngineeringChang’an UniversityXi’anChina

Nanofiltration technology has opened an efficient pathway to addressing the grand issue of wastewater ***(PEI),as a hydrophilic polymer,is a promising material to manufacture separation membranes owing to its ***,we prepared a hyperbranched PEI-based separation mem-brane through the supramolecular hydrogen bond interaction for wastewater *** amino groups in the PEI molecule were partially oxidized to the nitro groups with sodium hypochlorite(NaClO).Moreover,the PEI molecu-lar chains can be regulated from the hyperbranched state to the internal nucle-ation *** dynamics simulation results further indicated the strong hydrogen bonds among the oxidized PEI(O-PEI)molecular chains and the decreased gyration radius of the O-PEI molecule due to the formation of the nitro *** addition,the wettability and zeta potential of O-PEI membranes can be controlled by adjusting the molecular weight and oxidation degree of the PEI *** the collective effect of size screening and charge repulsion,the O-PEI separation membrane displayed a wide range of purification capabilities for contaminations,such as dye molecules and *** work may offer a new strategy to fabricate hyperbranched O-PEI membranes for wastewater purifica-tion.

关键词： hyperbranched PEI nanofiltration membrane supramolecular hydrogen bond wastewater purification

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Tissue P systems with cell separation: attacking the partition problem

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Science China(Information Sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2, NIU YunYun2 & PAN LinQiang2 1key Lab of Intelligent Computing and Signal Processing of Ministry of Education, School of Computer Science and technology, Anhui University, Hefei 230039, China 2Image Processing and Intelligent control key laboratory of Education Ministry of China, Department of control Science and engineering, Huazhong University of Science and technology, Wuhan 430074, China 1. Key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

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Exploring the efficiency of image metric for assessing the visual quality of 3D mesh model

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第6期9卷 147-170页

作者： Li Che Fengju Kang College of Marine Engineering Northwestern Polytechnical University Xi’an 710072 P.R.China National Key Laboratory of Underwater Information Process and Control Xi’an 710072 P.R.China

Recent developments in 3D graphics technology have led to extensive processes on 3D meshes(e.g.,compression,simplification,transmission and watermarking),these processes unavoidably cause the visual perceptual degradation of the 3D *** existing mesh visual quality evaluation metrics either require topology constrain or fail to reflect the perceived visual ***,for the 3D objects that are observed on 2D screens by the users,it is reasonable to apply image metric to assess the distortion caused by mesh *** attempt to explore the efficiency of image metric for assessing the visual fidelity of the simplified 3D model in this *** this purpose,several latest and most effective image metrics,2D snapshots,number and pooling algorithms are involved in our study,and finally tested on the IEETA simplification *** statistical data allow the researcher to select the optimal parameter for this image-based mesh visual quality assessment and provide a new perspective for the design and performance assessment of mesh simplification algorithms.

关键词： Image metric 3D model visual quality assessment mesh distortion correlation analysis,performance analysis.

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Experimental research on dynamic characteristics analysis of machine tool based on unit structure

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Revista de la Facultad de Ingenieria 2016年第4期31卷 70-84页

作者： Zhu, Peihao Zheng, Qingchun Hu, Yahui Wang, Bing Chao, Jiaqi Tu, Huan Sun, Ning Li, Jinxiang School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin300384 China

By the experiment modal research for unit structure, the natural frequency and mass of US by means of experimental modal analysis is explored. Experimental modal analysis on US was applied to achieve optimal US simultaneously to satisfy multiple conflicting performance requirements of mass and natural frequency of US. Then the structural parameters of US were optimized to increase natural frequencies and reduce mass. Experimental modal analysis is an efficient technique to accurately identify the dynamic behavior of a structure and provides modal parameters, such as natural frequencies and mode shapes.

关键词： Modal analysis

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Investigation on thermal decomposition kinetics of ulipristal acetate (form B)

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2013 3rd International Symposium on Chemical engineering and Material Properties, ISCEMP 2013

作者： Lei, Rong-Rong Sha, Zuo-Liang Zhu, Liang Yang, Li-Bin Wang, Yan-Fei Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

ISBN: (纸本)9783037858363

Non-isothermal thennogravimetry analysis was applied to study the thermal decomposition kinetics of ulipristal acetate (form B). According to the experimental result, ulipristal acetate (form B) decomposed included three steps. Based on different kinetics function of corresponding thermal decomposition mechanisms and experimental data of ulipristal acetate (form B). decomposition mechanisms of three steps of ulipristal acetate (form B) were analyzed by differential method. According to fitting results of different mechanism functions, decomposition mechanisms of three steps of ulipristal acetate (form B) were determined, and three corresponding thermal decomposition dynamic functions were also obtained. © (2013) Trans Tech Publications, Switzerland.

关键词： Thermolysis

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keystone species in microbial communities: From discovery to soil heavy metal-remediation

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Journal of Hazardous Materials 2025年 494卷

作者： Gengbo Jiang Zhepu Ruan Yalin Yin Chang Hu Li Tian Jia-nan Lu Shizhong Wang Ye-Tao Tang Rongliang Qiu Yuanqing Chao School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou 510642 China

keystone species have significant impacts on community structure and function regardless of their abundance in space and time, whether individually or collectively. They play a unique and crucial role, and their removal can lead to substantial changes in the microbiome. It is one of the necessary processes to explore key microbial functions and interactions by studying keystone species. The term "keystone species" has been proposed and developed for nearly 60 years, but in microbiology, it is often used interchangeably with similar terms, which hinders the integration and advancement of research. Here, we review similar terms for keystone species in the microbial field and suggest using "keystone species" instead of "keystone taxa". We also summarize and analyze identification approaches for keystone species, highlighting the advantages and disadvantages of each while providing recommendations for selecting appropriate approaches in the environmental field. Based on the serious soil environment problem, this review also takes the research in the field of heavy metal-contaminated soils as case studies, and summarizes and analyzes the research situation of keystone species. Finally, we discuss the current limitations in research on keystone species, offering insights into their future development and application in the microbial field, particularly in remediation for heavy metal-contaminated soils. This review aims to summarize existing research on microbial keystone species and connect the findings to the field of environmental remediation, providing a reference for developing more effective remediation strategies and enhancing our understanding of ecosystem health.

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