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Anti-corrosion mechanism of epoxy-resin and different content Fe2O3 coatings on magnesium alloy

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Frontiers of Materials Science 2016年第4期10卷 367-374页

作者： TaoJlN Fan-mei KONG Rui-qin BAI Ru-liang ZHANG College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China College of Earth Science and Engineering Shandong University of Science and Technology Qingdao 266590 China

In this study, anti-corrosion coatings were prepared and coated success- fully on magnesium alloy substrates by mixing nanopowders, solvent, curing agent with epoxy resin. The effect of the amount of iron trioxide （Fe2O3） on the adhesion strength and corrosion resistance on magnesium alloy was investigated with standard protocols, and electrochemical measurements were also made in 3.5 wt.% NaCl solutions. The surface morphology and corrosion mechanism after corrosion tests was characterized using FESEM analysis. Nanoparticies in matrix acted as filler, and interstitial cross-linked spaces and other coating artifacts regions （micro cracks and voids） would all affect the anti-corrosion properties of coating. The results showed the proper powder content not only provided adhesion strength to these coatings but also improved obviously their anticorrosion. Hydrogen bound to the amine nitrogen （1N） could take part in the curing process rather than hydrogen of the amide site due to the smaller AG and the more stable configuration.

关键词： magnesium alloy corrosion iron trioxide anti-corrosion mechanism

Growth,Cadmium and Zinc Accumulation of Ornamental Sunflower (Helianthus annuus L.) in Contaminated Soil with Different Amendments

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Pedosphere 2012年第5期22卷 631-639页

作者： HAO Xiu-Zhen ZHOU Dong-mei LI Dan-Dan JIANG Ping Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China)

Use of ornamental plants for phytoremediation of metal-contaminated soil is a new option. A pot experiment was carried out to assess the effect of application of amendments, i.e., swine manure, salicylic acid （SA） and potassium chloride （KC1）, on the growth, uptake and translocation of cadmium （Cd） and zinc （Zn） of ornamental sunflower （Helianthus annuus L.） grown on a contaminated soil. The three amendments increased sunflower height, flower diameter, and biomass. Manure significantly decreased Cd and Zn concentrations in sunflower, and thus decreased the bioaccumulation coefficient （BCF） of Cd and Zn. However, using of KC1 markedly increased Cd concentrations in sunflower and the BCF of Cd. Additionally, both swine manure and KC1 application increased Cd and Zn translocation from root to aboveground part. Swine manure and salicylic acid reduced the Cd/Zn ratios in flower of sunflower, while KC1 significantly increased the Cd/Zn ratios. Correlation analysis demonstrated that the Cd/Zn ratio in the root of sunflower was affected by K/Na ratio in root and soil available potassium （K） concentration. Ornamental sunflower could be grown as an alternative plant in the Cd- and Zn-contaminated soil with KC1 application to get the balance between environmental and economic interests.

关键词： Cd/Zn ratio fertilizer heavy metals manure remediation

Calcium carbonate crystallization controlled by functional groups： A mini-review

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Frontiers of Materials Science 2013年第1期7卷 62-68页

作者： Hua DENG Xing-Can SHEN Xiu-mei WANG Chang DU State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Chemical Engineering Guangxi Normal University Guilin 541004 China School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China

Various functional groups have been suggested to play essential roles on biomineralization of calcium carbonate (CaCO3) in natural system. 2D and 3D models of regularly arranged functional groups have been established to investigate their effect on CaCO3 crystallization. This mini-review summarizes the recent progress and the future development is prospected.

关键词： functional group biomineralization crystallization CaCO3

Transcriptome assembly of Modiolus modiolus and comparative analysis with Bathymodiolus platifrons

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Acta Oceanologica Sinica 2018年第8期37卷 38-45页

作者： MENG Jie YANG mei XU Fei LI Xinzheng LI Li CAS Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of Sciences(CAS)Qingdao 266071China Laboratory for Marine Fisheries and Aquaculture Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China National and Local Joint Engineering Laboratory of Ecological Mariculture Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100039China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

The genetic basis for bivalves＇ adaptation and evolution is not well understood. Even few studies have focused on the mechanism of molluscan molecular evolution between the coastal intertidal zone and deep-sea *** our studies, we first conducted the transcritpome assembly of Modiolus modiolus mussels living in coastal intertidal zones. Also, we conducted transcriptome comparison analyses between M. modiolus and Bathymodiolus platifrons living in hydrothermal vents and cold methane/sulfide-hydrocarbon seeps. De novo assemblies of the clean reads yielded a total of 182 476 and 156 261 transcripts with N50 values of 1 769 and 1 545 in M. modiolus and B. platifrons. A total of 27 868 and 23 588 unigenes were identified, which also displayed the similar GO representation patterns. Among the 10 245 pairs of putative orthologs, we identified 26 protein-coding genes under strong positive selection（Ka/Ks〉1） and 12 genes showing moderate positive selection（0.5

关键词： mollusc transcriptome comparision positive selection stress adaptation

Data Distribution Mechanism over Opportunistic Networks with Limited Epidemic

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China Communications 2015年第6期12卷 154-163页

作者： GUO Da CHENG Gang ZHANG Yong SONG mei Amanda Matthews Beijing University of Posts and Telecommunications China Unicom Research Institute Texas State University

Most of data distribution mechanism in Opportunistic Networks is derived by Epidemic data distribution,and Epidemic data distribution means that when each node meets another node,it may copy its own messages and transfer to another *** the one hand,the copies improve the forwarding rate,and reduce the transmission ***,on the other hand,energy consumption increases and network survival time is reduced because the copies consume transmission ***,copy number should be under *** this paper,we first introduce the existing routing strategy based on Epidemic briefly,and present the Epidemic routing protocol analysis model and copy control mechanism based on the limited Epidemic in Opportunistic *** based on the limited copies scheme(LCS),we propose an energy balance scheme(EBS),the results show that EBS can improve the network survival time.

关键词： opportunistic networks delay tol-erant networks Markov chain

Intervention of cGAS‒STING signaling in sterile inflammatory diseases

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Journal of Molecular Cell Biology 2022年第2期14卷 1-17页

作者： Ze Hong Jiahao mei Hanli Guo Juanjuan Zhu Chen Wang State Key Laboratory of Natural Medicines Department of Life Science and TechnologyChina Pharmaceutical UniversityNanjing 211198China

Sterile inflammation characterized by unresolved chronic inflammation is well established to promote the progression of multiple autoimmune diseases,metabolic disorders,neurodegenerative diseases,and cardiovascular diseases,collectively termed‘sterile inflammatory diseases’.By recognizing host-derived DNA,cyclic guanosine monophosphate–adenosine monophosphate synthase(cGAS)activates endoplasmic reticulum-associated stimulator of interferon genes(STING),which leads to the induction of type I interferons and inflammatory cytokines or immunogenic cell death that promotes sterile ***,the DNA/cGAS-independent mode of STING activation has also been characterized in the progression of several sterile inflammatory *** review focuses on the molecular mechanism of cGAS-dependent and cGAS-independent STING signaling under various disease conditions,particularly highlighting the diverse initiators upon this signaling *** also summarize recent advances in the discovery of antagonists targeting cGAS and STING and the evaluation of their efficiencies in preclinical ***,we discuss potential differences in the clinical applications of the specific antagonists,which may shed light on the precision therapeutic interventions.

关键词： cGAS STING DNA sterile inflammatory disease antagonist

A policy gradient algorithm integrating long and short-term rewards for soft continuum arm control

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Science China(Technological Sciences) 2022年第10期65卷 2409-2419页

作者： DONG Xiang ZHANG Jing CHENG Long XU WenJun SU Hang mei Tao School of Electrical Engineering and Automation Anhui UniversityHefei 230601China State Key Laboratory for Control and Management of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Robotics Research Center Peng Cheng LaboratoryShenzhen 518055China

The soft continuum arm has extensive application in industrial production and human life due to its superior safety and flexibility. Reinforcement learning is a powerful technique for solving soft arm continuous control problems, which can learn an effective control policy with an unknown system model. However, it is often affected by the high sample complexity and requires huge amounts of data to train, which limits its effectiveness in soft arm control. An improved policy gradient method, policy gradient integrating long and short-term rewards denoted as PGLS, is proposed in this paper to overcome this issue. The shortterm rewards provide more dynamic-aware exploration directions for policy learning and improve the exploration efficiency of the algorithm. PGLS can be integrated into current policy gradient algorithms, such as deep deterministic policy gradient(DDPG). The overall control framework is realized and demonstrated in a dynamics simulation environment. Simulation results show that this approach can effectively control the soft arm to reach and track the targets. Compared with DDPG and other model-free reinforcement learning algorithms, the proposed PGLS algorithm has a great improvement in convergence speed and performance. In addition, a fluid-driven soft manipulator is designed and fabricated in this paper, which can verify the proposed PGLS algorithm in real experiments in the future.

关键词： soft arm control Cosserat rod deep reinforcement learning policy gradient algorithm high sample complexity

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Phosphorus Speciation in Wetland Sediments of Zhujiang (Pearl) River Estuary,China

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Chinese Geographical Science 2013年第5期23卷 574-583页

作者： WANG Lili YE mei LI Qusheng ZOU Hang ZHOU Yongsheng Department of Environmental Engineering Jinan University Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation Department of Education of Guangdong Province

Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang （Pearl） River estuary wetland were investigated. Results showed that the total phosphorus （TP） content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg; inorganic phosphorus （IP） was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg. Among the inorganic phosphorus, the main fractions were phosphorus bound to A1 and Fe （Fe/A1-P）, and calcium-bound phosphorus （Ca-P）, accounting for 23%-42% and 21%-67% of IP, respectively. The vertical distribution of TP contents were significantly positive correlated with organic phosphorus （Org-P） and Fe/A1-P contents. The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg, mainly existed in Fe-AI/P fraction, and increased from the bottom to top sediments. The transport of phosphorus in sediment-water in- terface was controlled by the soil characteristics. The active Fe and A1 content was considered as the main factor that determines adsorp- tion capacity in vegetated marsh wetland. The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland. The potential risk of eutrophication in the study area is high. Reducing terrestrial phosphorus discharge and preventing the sediment Fe/A1-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands, and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment.

关键词： estuary wetland phosphorus fraction adsorption-desorption

Particle charging characteristics with the low-speed mixed fluid under high electric field

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1689-1695页

作者： HE Bo LI YaDong MA DongDong GU Ran LIN mei State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University State Laboratory of Fluid Machinery Xi'an Jiaotong University

Air pollution caused by particles with small size has been a global concern because of threats to human health.A feasible way to remove these super fine suspended particles is using electrostatic precipitation ***,the PIV was used to measure the particle velocity *** analyzing the particle motion trend in high electric field,a process of particle charging loss was *** phenomenon cannot be explained by current particle charging *** conclusions may improve the understanding of particle charging processes.

关键词： particle charging super fine particles PIV electric field flow field