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In-situ TEM study of the effect of hydrogen-helium ratio on defect characteristics in Fe9Cr1.5W0.4Si F/M steel during H_(2)^(+)&He^(+)simultaneous irradiation

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Journal of Materials Science & Technology 2024年第6期173卷 192-201页

作者： Dewang Cui Ziqi cao Kun He Yuanming Li Xi Qiu Guang Ran College of Energy Xiamen UniversityXiamen 361102China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen 361102China Science and Technology on Reactor Fuel and Materials Laboratory Chengdu 610041China Nuclear Power Institute of China Chengdu 610041China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041China

The effect of hydrogen and helium interaction,especially H-He ratio,on the irradiation behavior of nuclear materials has not yet been ***,this is an important basis for evaluating the irradiation properties of nuclear materials and developing high irradiation resistant ***,30 keV H_(2)^(+)and He^(+)dual beams with four H-He ratios of 0:10,3:10,15:10,and 30:10 were used to irradiate the newly developed Fe9Cr1.5W0.4Si F/M steel in TEM to in-situ study the interaction and ratio effect of hydrogen and *** addition of H atoms significantly promoted the nucleation of dislocation loops and *** the early stage of irradiation,the average size and density of dislocation loops increased with the increase of H-He ***,the larger the H-He ratio,the easier it was to form a complex dislocation ***,the final saturation size of bubbles increased with the increase of H-He *** was first found that the swelling was affected by H concentrations,with high H concentrations slowing down the increase in *** a certain irradiation dose,a specific H-He ratio would lead to a swelling peak of Fe9Cr1.5W0.4Si F/M *** super-sized bubbles at grain boundaries(GBs)were found after H addition,resulting in a bigger swelling of GBs than the *** the swelling of the GBs and the matrix show a dependence on the H-He *** current work is of great significance for understanding the interaction between hydrogen and helium in nuclear materials.

关键词： Dose ratio effect Ferritic-martensitic steel Hydrogen&helium synergetic irradiation In-situ TEM

耦合混合像元分解和混合元胞模拟的土地覆盖变化推演

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地球信息科学学报 2024年第7期26卷 1611-1628页

作者：曹玮肖瑶梁迅关庆锋中国地质大学(武汉)地理与信息工程学院武汉430078 北京辰安科技股份有限公司北京100094 中国地质大学(武汉)国家地理信息系统工程技术研究中心武汉430078

元胞自动机(CA)是土地利用/土地覆盖变化模拟的重要工具。以往基于纯质元胞的CA模型忽略了元胞内部的混合土地覆盖结构,难以模拟现实中混合土地系统在快速城市化进程的连续演化。而混合元胞CA模型(MCCA)虽能较好地处理这一问题,却因难... 详细信息

元胞自动机(CA)是土地利用/土地覆盖变化模拟的重要工具。以往基于纯质元胞的CA模型忽略了元胞内部的混合土地覆盖结构,难以模拟现实中混合土地系统在快速城市化进程的连续演化。而混合元胞CA模型(MCCA)虽能较好地处理这一问题,却因难以获取精细尺度的混合结构数据而不易于推广。为了解决这个问题,本研究提出了耦合混合像元分解方法和MCCA模型的模拟分析框架,利用混合像元分解算法从Landsat影像中直接获取MCCA模型所需的亚元胞尺度混合结构数据;并利用SHAP方法挖掘亚元胞尺度土地覆盖变化的驱动力。本文以武汉市为研究区开展了实验,研究结果表明:①耦合模型在混合土地结构的空间格局表征以及未来变化模拟方面具有较高的准确性(解混精度高于0.8,mcFoM指数达到0.38);②本文的耦合模型能够在有效模拟精细尺度的土地覆盖动态变化及其比例关系的同时,发现区域土地覆盖变化的相关规律。例如:未来的土地覆盖结构变化主要集中在建成区附近,土地混合度将经历先增后减的过程,靠近公司企业、市政府和高人口、高GDP是不透水面扩张的重要驱动因素,在离高铁站相对较远的地方,不透水面比近处增长更加明显;③本文模型模拟的未来土地覆盖变化趋势与武汉市的未来规划布局相符,多情景间的对比体现了MCCA模型在精确捕捉像元间土地覆盖比例细微差异方面的能力。本研究通过耦合遥感领域的混合像元分解方法和GIS领域的混合元胞CA模型,解决了混合土地覆盖模拟缺乏精细尺度数据源的问题,实现了在亚像元尺度下的未来混合土地覆盖结构变化模拟,可为城市管理和规划决策提供新的方法与工具。

关键词：土地利用变化土地覆盖地理模拟混合元胞元胞自动机混合像元分解

Comparative analysis of impact of human occupancy on indoor microbiomes

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 145-154页

作者： Liu cao Lu Yang Clifford S.Swanson Shuai Li Qiang He Department of Civil and Environmental Engineering The University of TennesseeKnoxvilleTN37996USA Institute for a Secure and Sustainable Environment The University of TennesseeKnoxvilleTN37996USA

Educational facilities serve as community hubs and consequently hotspots for exposure to pathogenic ***,it is of critical importance to understand processes shaping the indoor microbiomes in educational facilities to protect public health by reducing potential exposure risks of students and the broader *** this study,the indoor surface bacterial microbiomes were characterized in two multifunctional university buildings with contrasting levels of human occupancy,of which one was recently constructed with minimal human occupancy while the other had been in full operation for six *** levels of human occupancy in the older building were shown to result in greater microbial abundance in the indoor environment and greater proportion of the indoor surface bacterial microbiomes contributed from human-associated microbiota,particularly the skin *** was further revealed that human-associated microbiota had greater influence on the indoor surface bacterial microbiomes in areas of high occupancy than areas of low *** with minimal impact from human occupancy in a new construction,the indoor microbiomes in the new building exhibited significantly lower influence from human-associated microbiota than in the older building,with microbial taxa originating from soil and plants representing the dominant constituents of the indoor surface bacterial *** contrast,microbial taxa in the older building with extensive human occupancy were represented by constituents of the human microbiota,likely from *** findings provide insights into processes shaping the indoor microbiomes which will aid the development of effective strategies to control microbial exposure risks of occupants in educational facilities.

关键词： Built environment Indoor microbiome Occupant Building Sequencing

Edge engineering in chemically active two-dimensional materials

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Nano Research 2022年第11期15卷 9890-9905页

作者： Lijun Zhou Mengyan Li Wei Wang Cong Wang Huiping Yang Yang cao State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

When "cut off" continuous and uniform basal plane of two-dimensional(2D)materials,edges appear at *** edges with unique one-dimensional(1D)structures and bound-states significantly alter materials’local chemical activities and have been extensively investigated as model platforms for investigating structure–property–performance relationships for *** interesting phenomena have been discovered in the past decades,highlighting the importance of interactions between active species and edge atoms at the atomic level and making 1D edges as emerging catalysts with high efficiency,promising candidates for battery and electrochemical ***,this review focuses on the recent progress of edge synthesis and structural engineering methods,understanding of edge structure–activity mechanisms,and potential applications using edge *** and prospects are also envisioned.

关键词： two-dimensional(2D)materials one-dimensional(1D)edges relation of structure-activity

Surface Bioactive Modification of Alumina Ceramic by Mineralization in Modified SBF

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Journal of Bionic Engineering 2022年第6期19卷 1637-1644页

作者： Wenmin Zhang Caixia Liang Qixuan He xiaoyan cao Fangli Yuan Jiandong Ye School of Material Science and Engineering South China University of TechnologyGuangzhou510640China National Engineering Research Center for Tissue Restoration and Reconstruction Guangzhou510006China Guangdong Fapon Biotech Co.Ltd Dongguan523808China Inspection and Quarantine Comprehensive Technology Centre of Foshan Entry‐exit Inspection and Quarantine Bureau Foshan528042China Key Laboratory of Biomedical Materials of Ministry of Education South China University of TechnologyGuangzhou510641China

In the present study,it is found that the prepared alumina ceramics has better mineralization ability in a newly revised simulated body *** the extension of mineralization time,the amount of hydroxyapatite(HA)crystals deposited on the surface of alumina ceramics also increased *** results of cell biological experiments of alumina ceramics with hydroxyapatite surface layer demonstrate that the mineralized materials have better biological activity and osteogenesis properties in *** the meanwhile,the ALP activity and expression of osteogenesis-related genes(OPN,ALP,Col-I,and OCN)of mouse bone marrow stromal stem cells on the samples were significantly promoted by increasing the formation of HA on the surface of alumina *** research concluded that alumina ceramics with HA phase on surface had great potential to be developed as a sort of bioactive material in the bone repair field.

关键词： Alumina Biomaterials Mineralization Hydroxyapatite Osteoblasts

Fixed-Time Antidisturbance Consensus Tracking for Nonlinear Multiagent Systems With Matching and Mismatching Disturbances

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1410-1423页

作者： Xiangmin Tan Chunyan Hu Guanzhen cao Qinglai Wei Wei Li Bo Han Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190 School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100049China Institute of Automation Chinese Academy of SciencesBeijing 100190 School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China IEEE

In this paper,fixed-time consensus tracking for mul-tiagent systems(MASs)with dynamics in the form of strict feed-back affine nonlinearity is addressed.A fixed-time antidistur-bance consensus tracking protocol is proposed,which consists of a distributed fixed-time observer,a fixed-time disturbance observer,a nonsmooth antidisturbance backstepping controller,and the fixed-time stability analysis is conducted by using the Lyapunov theory *** paper includes three main ***,a distributed fixed-time observer is developed for each follower to obtain an estimate of the leader’s output by utilizing the topology of the communication ***,a fixed-time disturbance observer is given to estimate the lumped disturbances for feedforward ***,a nonsmooth antidisturbance backstepping tracking controller with feedforward compensation for lumped disturbances is *** order to mitigate the“explosion of complexity”in the tradi-tional backstepping approach,we have implemented a modified nonsmooth command filter to enhance the performance of the closed-loop *** simulation results show that the pro-posed method is effective.

关键词： Antidisturbance backstepping consensus tracking fixed-time stability multiagent system(MASs) strict feedback affine nonlinear systems.

Stochastic Programming for Cost Optimization in Geographically Distributed Internet Data Centers

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 1215-1232页

作者： Peng Wang Yujie cao Zhaohao Ding Honghai Tang Xuanyuan Wang Ming Cheng Electrical and Electronic Engineering Department North China Electric Power UniversityBeijing 102206China Beijing Electric Power Trading Center Beijing 100032China Jibei Electric Power Trading Center Beijing 100032China Alibaba Infrastructure Service Hangzhou 311121China

The development of cloud computing has accel-erated the worldwide growth of internet data centers(IDCs).While a large portion of the energy consumption generated by intense computation introduces greater operation expenditures to the IDC *** manage the overall costs and utilize resources to their fullest extent,this paper introduces the concept of spatio-temporal workload allocation among the geographically distributed IDCs within a cloud,with the guarantee of the workload completion time and the consideration of computing service delay penalties by introducing the cost of *** from the effort of the workload migration,the spatio-temporal variance of the renewable energies in the data center microgrids(DMGs)is fully considered in this ***'s more,as the power consumed by the IDCs are primarily converted into heat,the waste heat recovery process is embedded in each IDC to demonstrate the effectiveness of the repurposed heat,which can be used by the residential heating demand in the thermal system,for total cost reduction and energy usage efficiency in the whole operating *** real-life data traces of the electricity price,renewable energies and heating demand,these extensive evaluations demonstrate that both spatial and temporal complementary attempts on the supply side and demand side,along with power and thermal complementary efforts,can significantly reduce the overall cost for the IDC enterprise.

关键词： Cost management cost of inconvenience Internet data centers workload allocation

Comparative proteomics analysis of pomegranate seeds on fruit maturation period(Punica granatum L.)

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Journal of Integrative Agriculture 2015年第12期14卷 2558-2564页

作者： cao Shang-yin NIU Juan cao Da LI Hao-xian XUE Hui CHEN Li-na ZHANG Fu-hong ZHAO Di-guang Zhengzhou Fruit Research Institute Chinese Academy of Agricultural Sciences School of Biosciences Faculty of Science The University of Melbourne

Seeds play a central role in the life cycle of plants. Seed hardness in pomegranates is of economic relevance, yet scarcely studied and poorly understood in China. In this study, we compared the proteomic differences between Zhongnonghong（soft-seeded） and Sanbai（hard-seeded） pomegranates. A total of 892 protein spots from both varieties were detected on two-dimensional electrophoresis gels（2-DE）; 76 spots showed greater than a 1.5-fold or less than a 0.66-fold difference（P〈0.05） in Zhongnonghong compared to Sanbai, of which 24 exhibited greater than a 2-fold change. Compared with Sanbai, Zhongnonghong possessed 14 up-regulated, and 10 down-regulated proteins. We identified and annotated 5 of these by using MALDI-TOF-TOF MS： pyruvate dehydrogenase（PDH） E1-β family protein（spot 4 609）; alanine aminotransferase 2-like（ALT2L）; mitochondrial glycine decarboxylase complex P-protein（spot 5 803）; phosphofructokinase B（Pfk B）-type family of carbohydrate kinase（spot 8 411）; and putative dna K-type molecular chaperone heat shock cognate protein 70（Hsc70）（spot 9 006）. Of these, 3 proteins（spots 4 609, 5 608, 5 803） were hypothesized to play a role in the formation of seed hardness. The other two proteins（spots 8 411, 9 006） were theorized to play a role in protecting the seeds from adverse stress during periods of fruit maturation. This study sets the foundation for further research on molecular mechanisms related to pomegranate seed hardness.

关键词： pomegranates soft-seeded hard-seeded proteomics

3D multiphase flow simulation of Marangoni convection on reactive absorption of CO_(2) by monoethanolamine in microchannel

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Chinese Journal of Chemical Engineering 2022年第3期35卷 370-377页

作者： Shuai Chen Jiahong Lan Yu Zhang Jia Guo Zhikai cao Yong Sha Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

A multiphase flow 3D numerical simulation method employing the coupled volume of fluid(VOF)and level set model is established to study the reactive absorption of CO_(2)by the monoethanolamine(MEA)aqueous solution in a falling film *** on the flow-reaction-mass transfer model of the MEA-CO_(2)system in the falling film microchannel,the enhancement effect of the Marangoni convection in this reactive absorption process is *** enhancement factor of the Marangoni convection obtained in this work is in good agreement with experimental results in the *** consideration of the absorption ratio as well as the enhancement effect of the Marangoni convection,the influence of different MEA concentrations on absorption of CO_(2)is ***,the appropriate MEA concentration for absorption enhanced by the Marangoni convection is acquired.

关键词： Numerical simulation Microchannel Falling film Marangoni convection MEA-CO_(2)