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One-pot scalable in situ growth of highly corrosion-resistant MgAl-LDH/MBT composite coating on magnesium alloy under mild conditions

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Journal of Materials Science & Technology 2021年第33期92卷 225-235页

作者： Ting hu Yuejun Ouyang zhi-hui Xie Liang Wu Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

Current corrosion-resistant layered double hydroxide(LDH)coating on Mg alloy is usually in situ grown in autoclave by hydrothermal methods under high temperature and high-pressure conditions,which is unfavorable for industrial *** report that an inhibitor(2-mercaptobenzothiazole,MBT)incorporated composite(Mg Al-LDH/MBT)coating can be in situ deposited on bare AZ31 Mg alloy surface with the assistance of a chelating agent(ethylenediaminetetraacetic acid)under a relatively low temperature(95℃)and ambient pressure by a one-pot *** successful formation of LDH/MBT composite coating is confirmed by a series of characterizations,such as X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and energy dispersive spectroscopy(EDS).The corrosion resistance of the composite coating is evaluated by means of hydrogen evolution measurement,electrochemical impedance spectroscopy(EIS),Tafel polarization curves,and neutral salt spray *** tests show that the LDH/MBT composite coating has a very low corrosion current density(1.7310^(-8)A cm^(-2)),an extremely high charge transfer resistance(2.336 M cm^(2)),and does not show any corrosion pits even after 15 d of exposure to a Na Cl solution or 7 d of exposure to salt fog environment,manifesting the good and robust corrosion ***,the deposition and corrosion protection mechanisms of the Mg Al-LDH/MBT composite coating are also discussed and proposed based on the EDS characterization of the coating after long-time exposure.

关键词： Magnesium alloy Coating Corrosion resistance Layered double hydroxide

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HYDRODYNAMIC INTERACTION BETWEEN FLNG VESSEL AND LNG CARRIER IN SIDE BY SIDE CONFIGURATION

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Journal of Hydrodynamics 2012年第5期24卷 648-657页

作者： ZHAO Wen-hua YANG Jian-min hu zhi-qiang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The Floating Liquefied Natural Gas （FLNG） is a new type of floating platform for the exploitation of stranded offshore oil/gas fields. The side by side configuration for the FLNG vessel and the LNG carrier arranged in parallel is one of the possible choices for the LNG offloading. During the offloading operations, the multiple floating bodies would have very complex responses due to their hydrodynamic interactions. In this study, numerical simulations of multiple floating bodies in close proximity in the side by side offloading configuration are carried out with the time domain coupled analysis code SIMO. Hydrodynamic interactions between the floating bodies and the mechanical coupling effects between the floating bodies and their connection systems are included in the coupled analysis model. To clarify the hydrodynamic effects of the two vessels, numerical simulations under the same environmental condition are also conducted without considering the hydrodynamic interactions, for comparison. It is shown that the hydrodynamic interactions play an important role in the low frequency motion responses of the two vessels, but have little effect on the wave frequency motion responses. In addition, the comparison results also show that the hydrodynamic interactions can affect the loads on the connection systems.

关键词： Floating Liquefied Natural Gas (FLNG) hydrodynamic interactions side by side operation relative motions

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Interplay between ethylene and nitrogen nutrition:How ethylene orchestrates nitrogen responses in plants

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Journal of Integrative Plant Biology 2023年第2期65卷 399-407页

作者： biao Ma Tian Ma Wenhao Xian Bin hu Chengcai Chu Guangdong Laboratory for Lingnan Modern Agriculture State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesCollege of AgricultureSouth China Agricultural UniversityGuangzhou 510642China

The stress hormone ethylene plays a key role in plant adaptation to adverse environmental ***(N)is the most quantitatively required mineral nutrient for plants,and its availability is a major determinant for crop *** in N availability or N forms can alter ethylene biosynthesis and/or *** serves as an important cellular signal to mediate root system architecture adaptation,N uptake and translocation,ammonium toxicity,anthocyanin accumulation,and premature senescence,thereby adapting plant growth and development to external N ***,we review the ethylenemediated morphological and physiological responses and highlight how ethylene transduces the N signals to the adaptive *** specifically discuss the N-ethylene relations in rice,an important cereal crop in which ethylene is essential for its hypoxia survival.

关键词： adaptive response cellular signal ethylene nitrogen acquisition and utilization

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Global dynamic spatiotemporal pattern of seasonal influenza since 2009 influenza pandemic

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Infectious Diseases of Poverty 2020年第1期9卷 55-63页

作者： zhi-Wei Xu Zhong-Jie Li Wen-biao hu School of Public Health and Social Work&Institute of Health and Biomedical Innovation Queensland University of TechnologyBrisbaneAustralia Institute of Health and Biomedical Innovation Queensland University of TechnologyBrisbaneAustralia School of Public Health Faculty of MedicineUniversity of QueenslandBrisbaneAustralia Division of Infectious Disease Key Laboratory of Surveillance and Early-warning on Infectious DiseaseChinese Center for Disease Control and PreventionBeijingChina

Background:Understanding the global spatiotemporal pattern of seasonal influenza is essential for influenza control and *** data on the updated global spatiotemporal pattern of seasonal influenza are *** study aimed to assess the spatiotemporal pattern of seasonal influenza after the 2009 influenza ***:Weekly influenza surveillance data in 86 countries from 2010 to 2017 were obtained from ***,the proportion of influenza A in total influenza viruses(PA)was ***,weekly numbers of influenza positive virus(A and B)were divided by the total number of samples processed to get weekly positive rates of influenza A(RWA)and influenza B(RWB).Third,the average positive rates of influenza A(RA)and influenza B(RB)for each country were calculated by averaging RWA,and RWB of 52 weeks.A Kruskal-Wallis test was conducted to examine if the year-to-year change in PA in all countries were significant,and a universal kriging method with linear semivariogram model was used to extrapolate RA and RB in all ***:PA ranged from 0.43 in Zambia to 0.98 in Belarus,and PA in countries with higher income was greater than those countries with lower *** spatial patterns of high RB were the highest in sub-Saharan Africa,Asia-Pacific region and South *** peaked in early weeks in temperate countries,and the peak of RWB occurred a bit *** were some temperate countries with non-distinct influenza seasonality(e.g.,Mauritius and Maldives)and some tropical/subtropical countries with distinct influenza seasonality(e.g.,Chile and South Africa).Conclusions:Influenza seasonality is not predictable in some temperate countries,and it is distinct in Chile,Argentina and South Africa,implying that the optimal timing for influenza vaccination needs to be chosen with caution in these unpredictable countries.

关键词： Influenza a Influenza B Seasonality Spatial pattern Vaccination

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Spot and Facula Activity Variations of the Eccentric Detached Eclipsing Binary KIC 8098300 Based on the Time-series Orbital Solutions

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Research in Astronomy and Astrophysics 2022年第1期22卷 174-188页

作者： hu-biao Niu Jian-Ning Fu Jia-Xin Wang Chun-Qian Li Department of Astronomy Beijing Normal UniversityBeijing 100875China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

The LAMOST spectra and Kepler light curves are combined to investigate the detached eclipsing binary KIC 8098300,which shows the O’Connell effect caused by spot/facula *** radial velocity(RV)measurements are derived by using the tomographic spectra disentangling *** mass ratio q=K1/K2=0.812±0.007,and the orbital semimajor axis a sin i=14.984±0.048 R_(⊙)are obtained by fitting the RV *** optimize the binary model concerning the spot/facula activity with the code PHOEBE and obtain precise parameters of the orbit including the eccentricity e=0.0217±0.0008,the inclination i=87°.71±0°.04,and the angle of periastronω=284°.1±0°.*** masses and radii of the primary and secondary star are determined as M_(1)=1.3467±0.0001 M_(⊙),R_(1)=1.569±0.003 R_(⊙),and M_(2)=1.0940±0.0001 M_(⊙),R_(2)=1.078±0.002 R_(⊙),*** ratio of temperatures of the two component stars is r_(teff)=0.924±*** also obtain the periastron precession speed of 0.000024±0.000001 day *** residuals of out-of-eclipse are analyzed using the auto-correlation function and the discrete Fourier *** spot/facula activity is relatively weaker,but the lifetime is longer than that of most single main sequence stars in the same temperature *** average rotation period of the spots P_(rot)=4.32 days is slightly longer than the orbital period,which may be caused by either the migration of spots/faculae along the longitude or the latitudinal differential *** activity may be spot-dominated for the secondary star and facula-dominated for the primary *** method of this work can be used to analyze more eclipsing binaries with the O’Connell effect in the Kepler field to obtain the precise parameters and investigate the difference of spot behavior between binaries and single *** is helpful for a deeper understanding of the stellar magnetic activity and dynamo theory.

关键词： (stars:)binaries:eclipsing (stars:)starspots stars:individual(KIC 8098300)

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Type 1 interferon-associated necroptosis： a novel mechanism for Salmonella enterica Typhimurium to induce macrophage death

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Cellular & Molecular Immunology 2013年第1期10卷 10-12页

作者： zhi-Qing hu Wei-hua Zhao Department of Microbiology and Immunology ShowaUniversity School of Medicine Tokyo Japan Correspondence: Dr ZQ hu Department of Microbiologyand Immunology Showa University School of Medicine1-5-8 Hatanodai Shinagawa-ku Tokyo 142-8555Japan

As one of the facultatively intracellular bacteria, Salmonella enterica serovarTyphimurium （S. Typhimurium） replicates even in macrophages and induces their death--a key strategy of this virulent patho- gen in evading the innate immune response.1 The underlying mechanisms are well known but complex, because many pathways are involved, such as apoptosis,2 necrosis,3 pyr- optosis4 and autophagy,s In a recent issue of Nature Immunology, Robinson et al. reveal a novel pathway for killing macrophages dur- ing infection： type 1 interferon- （IFN-α and IFN-β associated necroptosis.6

关键词： Type 1 interferon-associated necroptosis a novel mechanism Salmonella enterica Typhimurium macrophage death

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Numerical and experimental study on the hydraulic characteristics of a vertical axial pump under various clearances of flare tube

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Journal of Hydrodynamics 2023年第1期35卷 125-144页

作者： Jia-qi Chen zhi-kui He zhi-yang hu Hong-bo Shi Xikun Wang Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang212013China Chongqing Pump Industry Co.Ltd. Chongqing400033China

In order to investigate the characteristics of a vertical axial flow pump under various clearances of flare tube, the bell-shaped inlet and box culvert outlet channels with flare tube are studied numerically and experimentally. Then, the cases of inlet and outlet channels with the least hydraulic loss are selected to form an integral pump system, for which both numerical simulation and experimental investigation are carried out. The numerical results agree well with the experimental data. It is shown that the clearances of the interfaces between different components of the pump system have a significant impact on the internal flow structure, turbulent entropy and hydraulic performance of the inlet and outlet channels. For the cases of normalized bottom clearance less than 0.5 and normalized top clearance larger than 0.4, the internal flow and hydraulic performance indexes of inlet and outlet channels are relatively poor. There also exists a critical clearance in either inlet or outlet channel at which the hydraulic loss reaches the maximum. The results serve as an important reference for the design as well as safe and efficient operation of the vertical axial flow pump system.

关键词： Axial flow pump clearance of flare tube numerical simulation experiment hydrodynamic characteristics

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A Hierarchic Method for Studying the Distribution of Phenanthrene in Eisenia fetida

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Pedosphere 2014年第6期24卷 743-752页

作者： SHI zhi-Ming XU Li hu Feng College of Resources and Environmental Sciences Nanjing Agricultural University

The distribution of heavy metals in earthworms has been widely studied, highlighting the importance of the fate of these ***, little information is available on the distribution of hydrophobic organic contaminants(HOCs) within earthworms. The aim of this study was to propose a hierarchic method to study the distribution of phenanthrene(PHE), a typical HOC, in Eisenia fetida at several levels: sub-organism(pre-clitellum, clitellum and post-clitellum), tissue(body wall, gut and body fluid) and subcellular(intracellular and extracellular fractions). Earthworms were incubated in the soils amended with low(LC, 10 mg kg-1) and high concentrations(HC, 50 mg kg-1) of PHE and sampled at different time intervals. At the sub-organism level, the distribution of PHE was homogeneous among the sub-organism fractions in the LC treatment but heterogeneous in the HC treatment and gradually reached the following form of post-clitellum ≈ clitellum > pre-clitellum. The uptake and elimination kinetics of PHE in the sub-organism were well described by a one-compartment model. At the tissue level, the concentration of PHE followed the order of gut > body fluid >body wall; while at the subcellular level, the concentration of PHE in the extracellular fraction was 1.23 to 4.68 times higher than that in the intracellular fraction. Therefore, the simple circulatory system of earthworms may account for the PHE distribution at the sub-organism level. Partition pathways(passive diffusion) of PHE between the body wall, body fluid and gut as well as the processes of PHE entrance into the inner cellular compartment via passive diffusion were experimentally supported.

关键词： earthworm passive diffusion subcellular level sub-organism level tissue level

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High efficient multipacket decoding approach for network coding in wireless networks

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The Journal of China Universities of Posts and Telecommunications 2013年第1期20卷 95-100页

作者： YAO Yu-kun WEN Ya-di REN zhi LIU zhi-hu Chongqing Key Laboratory of Mobile Communication Technology Chongqing University of Posts and Telecommunications

To improve the performance of transmission by reducing the number of transmission and network overhead of wireless single-hop networks, this paper presents a high efficient multipacket decoding approach for network coding （EMDNC） in wireless networks according to the idea of encoding packets which cannot be decoded and are stored in buffer by receiving nodes, the lost packets can be recovered from these encoded packets. Compared with the network coding wireless broadcasting retransmission （NCWBR）, EMDNC can improve the efficiency of decoding and reduce the number of retransmission and transmission delay. Simulation results reveal that EMDNC can effectively reduce the number of retransmission and network overhead.

关键词： wireless single-hop networks network coding number ofretransmission transmission delay network overhead

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A Novel Hardware/Software Partitioning Method Based on Position Disturbed Particle Swarm Optimization with Invasive Weed Optimization

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Journal of Computer Science & Technology 2017年第2期32卷 340-355页

作者： Xiao-hu Yan Fa-zhi He Yi-Lin Chen State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China School of Computer Science Wuhan University Wuhan 430072 China

With the development of the design complexity in embedded systems, hardware/software （HW/SW） partitioning becomes a challenging optimization problem in HW/SW co-design. A novel HW/SW partitioning method based on position disturbed particle swarm optimization with invasive weed optimization （PDPSO-IWO） is presented in this paper. It is found by biologists that the ground squirrels produce alarm calls which warn their peers to move away when there is potential predatory threat. Here, we present PDPSO algorithm, in each iteration of which the squirrel behavior of escaping from the global worst particle can be simulated to increase population diversity and avoid local optimum. We also present new initialization and reproduction strategies to improve IWO algorithm for searching a better position, with which the global best position can be updated. Then the search accuracy and the solution quality can be enhanced. PDPSO and improved IWO are synthesized into one single PDPSO-IWO algorithm, which can keep both searching diversification and searching intensification. Furthermore, a hybrid NodeRank （HNodeRank） algorithm is proposed to initialize the population of PDPSO-IWO, and the solution quality can be enhanced further. Since the HW/SW communication cost computing is the most time-consuming process for HW/SW partitioning algorithm, we adopt the GPU parallel technique to accelerate the computing. In this way, the runtime of PDPSO-IWO for large-scale HW/SW partitioning problem can be reduced efficiently. Finally, multiple experiments on benchmarks from state-of-the-art publications and large-scale HW/SW partitioning demonstrate that the proposed algorithm can achieve higher performance than other algorithms.

关键词： hardware/software partitioning particle swarm optimization invasive weed optimization communicationcost parallel computing

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