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A Hybrid Coupled Ocean–Atmosphere Model and Its Simulation of ENSO and Atmospheric Responses

Advances in Atmospheric Sciences 2019年第6期36卷 643-657页

作者： Junya HU rong-hua ZHANG Chuan GAO Chinese Academy of Sciences Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences Pilot National Laboratory for Marine Science and Technology Center for Ocean Mega-Science Chinese Academy of Sciences University of Chinese Academy of Sciences

A new hybrid coupled model(HCM) is presented in this study, which consists of an intermediate tropical Pacific Ocean model and a global atmospheric general circulation model. The ocean component is the intermediate ocean model(IOM)of the intermediate coupled model(ICM) used at the Institute of Oceanology, Chinese Academy of Sciences(IOCAS). The atmospheric component is ECHAM5, the fifth version of the Max Planck Institute for Meteorology atmospheric general circulation model. The HCM integrates its atmospheric and oceanic components by using an anomaly coupling strategy. A100-year simulation has been made with the HCM and its simulation skills are evaluated, including the interannual variability of SST over the tropical Pacific and the ENSO-related responses of the global atmosphere. The model shows irregular occurrence of ENSO events with a spectral range between two and five years. The amplitude and lifetime of ENSO events and the annual phase-locking of SST anomalies are also reproduced realistically. Despite the slightly stronger variance of SST anomalies over the central Pacific than observed in the HCM, the patterns of atmospheric anomalies related to ENSO,such as sea level pressure, temperature and precipitation, are in broad agreement with observations. Therefore, this model can not only simulate the ENSO variability, but also reproduce the global atmospheric variability associated with ENSO, thereby providing a useful modeling tool for ENSO studies. Further model applications of ENSO modulations by ocean–atmosphere processes, and of ENSO-related climate prediction, are also discussed.

关键词： IOCAS ICM hybrid coupled model ENSO simulation atmospheric response

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Synthesis of Tin Oxide Through Thermal Decomposition of Sn_2(NH_4)_2(C_2O_4)_3 and Its Gas Sensing Property

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Chemical Research in Chinese Universities 2005年第6期21卷 641-645页

作者： SHI Juan WU Shi-hua WANG Shu-rong School of Materials Science and Chemical Engineering Tianjin Polytechnic University Tianjin 300160 P. R. China Department of Chemistry Nankai University Tianjin 300071 P. R. China

Nanocrystalline tin oxide samples were prepared by using Sn2 （NH4 ）2 （C2O4）3 as the precursor. The thermal decompositions were respectively conducted at 250,450 and 650 ℃. TG-DTA, XRD, TEM, FTIR were used to characterize the samples. The indirect heating sensors by using these materials as sensitive bodies were fabricated on an alumina tube with Au electrodes and platinum wires. Sensing properties of these sensors were investigated. It was found that the tin oxide sample obtained by thermal decomposition at 450 ℃ has a higher sensitivity to C2H5OH and a higher selectivity to hexane and ammonia than those obtained via the conventional precipitate method and the working temperatures needed were greatly decreased.

关键词： Tin dioxide Thermal decomposition Gas sensing property Selectivity

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Optimal investment based on relative performance and weighted utility

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Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 328-342页

作者： WANG Lei DONG Ying-hui hua Chun-rong Department of Mathematics Suzhou University of Science and TechnologySuzhou 215009China Changshu Institute of Technology Changshu 215500China

This paper studies the optimal portfolio allocation of a fund manager when he bases decisions on both the absolute level of terminal relative performance and the change value of terminal relative performance comparison to a predefined reference point. We find the optimal investment strategy by maximizing a weighted average utility of a concave utility and an Sshaped utility via a concavification technique and the martingale method. Numerical results are carried out to show the impact of the extent to which the manager pays attention to the change of relative performance related to the reference point on the optimal terminal relative performance.

关键词： relative performance weighted utility S-shaped utility concavification

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The study of the transmission of GHz waves in the oceanic low altitude waveguide in the PEM-based gridded method

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The Journal of China Universities of Posts and Telecommunications 2013年第6期20卷 24-29页

作者： CHEN Chao ZHANG ye-rong WANG Fang-fang College of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Suqian Branch of Jiangsu Company Limited China Mobile Communications Corporation

A parabolic equation method （PEM）-based discrete algorithm is proposed and is used to obtain the field distribution in the evaporation duct space. This method not only improves the computing speed, but also provides the flexibility to adjust the simulation accuracy. Numerical simulation of the wave propagation in the oceanic waveguide structure is done. In addition, the initial field distribution and progressive steps are determined. The loss model in the waveguide is solved through the numerical solution. By comparing the characteristics of the radio wave propagation in the duct and in the normal atmospheric structure, we analyses the radio transmission over the horizon detection in the oceanic waveguide.

关键词： evaporation duct the PEM-based gridded method transmission analysis

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Preparation and application of efficient TiO_2 /ACFs photocatalyst

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Journal of Environmental Sciences 2006年第5期18卷 979-982页

作者： LIU Jian-hua YANG rong LI Song-mei School of Materials Science and Engineering Beihang University Beijing 100083 China

Activated carbon fibers （ACFs） supported titanium dioxide （TiO2） photocatalyst was developed by sol-gel method. The surface morphology and microstructure of the photocatalyst were characterized with scan electron microscope（SEM）, X-ray diffraction patterns and specific surface area analysis. The prepared photocatalyst is specially helpful for the removal of low molecular weight organic pollutants in wastewater. Decomposition efficiency of methylene blue solution by TiO2/ACFs catalyst reached almost 100% under 60 min reaction, while the decomposition efficiency by pure TiO2 was only 25% under 3 h reaction. The mineralization of toluene aqueous solution was measured by total organic carbon instrument, and the evolution of intermediate species was detected by gas chromatograph instrument. The results indicated that the prepared photocatalyst not only enhanced the photoactivity of TiO2, but also suppressed the emergence of intermediate species, which may be more deleterious to human. The enhancement of photocatalysis was due to increased efficiency of adsorption and desorption, which were control steps in heterogeneous photocatalysis.

关键词： titanium dioxide activated carbon fibers photocatalysis toluene methylene blue

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Recent ENSO evolution and its real-time prediction challenges

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National Science Review 2022年第4期9卷 7-10页

作者： rong-hua Zhang Chuan Gao Licheng Feng Institute of Oceanology and Center for Ocean Mega-ScienceChinese Academy of Sciences Pilot National Laboratory for Marine Science and Technology National Marine Environmental Forecasting Center Ministry of Natural Resources

The El Ni?o-Southern Oscillation(ENSO) is a major interannually re occurring mode of Earth’s climate system that originates naturally from oceanatmosphere interactions in the tropical Pacific and can affect the weather and climate *** has been observed to undergo decadal variations and modulations [1-3],including the intensity,asymmetry of its two phases(El Ni?o and La Ni?a),different types of El Ni?o and multiyear La Ni?a and El Ni?o *** well-known example occurred during the so-called 1976-1977climate shift [4],with El Ni?o events emerging frequently in the tropical Pacific during the 1980s and 1990s.

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Comparative study of the effects of gold and silver nanoparticles on the metabolism of human dermal fibroblasts

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Regenerative Biomaterials 2020年第2期7卷 221-232页

作者： Yan huang Xiaoying Lü rong Chen ye Chen State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096P.R.China

The purpose of this article was to explore the effects of gold nanoparticles(GNPs)and silver nano-particles(SNPs)with different cytotoxicities on human dermal fibroblasts(HDFs)at the metabolic ***,~20 nm of GNPs and SNPs were prepared,and their effects on the proliferation of HDFs were ***,a metabolomics technique was used to analyse the effects of GNPs and SNPs on the expression profiles of metabolites in HDFs after 4,8 and 24h of ***,the key metabolites and key metabolic pathways involved in the interaction of GNPs and SNPs with HDFs were identified through expression pattern analysis and metabolic pathway analysis of differentially expressed metabolites and were finally verified by *** results of the cytotoxicity experiments showed that there was no cytotoxicity after the treatment of GNPs for 72 h,while the cytotoxicity of the SNPs reached grade 1 after 72 *** using metabolomics analysis,29,30 and 27 metabolites were shown to be differentially expressed in HDFs after GNP treatment,while SNPs induced the differential expression of 13,33 and 22 metabolites after 4,8 and 24h of treatment,*** and four candidate key metabolites in the GNP and SNP groups were identified by expression pattern analysis and metabolic pathway analysis,*** key metabolic pathways in the GNP and SNP groups were identified as the glutathione metabolic pathway(the key metabolite of which was glutathione)and the citrate cycle pathway(the key metabolite of which was malic acid).Based on the experiments used to verify the key metabolites and key metabolic pathways,it was found that the increase in glutathione after GNP treatment might trigger an oxidative stress protection mechanism and thus avoid *** exposure to SNPs,the citric acid content was increased,mainly through the citrate cycle path-way,thereby inhibiting the synthesis of malic acid to affect the formation of ATP and finally leading to cytotoxici

关键词： gold and silver nanoparticles human dermal fibroblasts metabolomics and bioinformatics metabolic pathway

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Putative zeatin O-glucosyltransferase OscZOG1 regulates root and shoot development and formation of agronomic traits in rice

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Journal of Integrative Plant Biology 2016年第7期58卷 627-641页

作者： Xiao-Ling Shang rong-rong Xie hua Tian,Qing-Long Wang and Fang-Qing Guo rong-rong Xie hua Tian Qing-Long Wang Fang-Qing Guo The National Key Laboratory of Plant Molecular Genetics and National Center of Plant Gene Research(shanghai) Institute of Plant Physiology&EcologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200032China.

As a ubiquitous reaction, glucosylation controls the bioactivity of cytokinins in plant growth and development. Here we show that genetic manipulation of zeatin-O- glucosylation regulates the formation of important agronomic traits in rice by manipulating the expression of OscZOG1 gene, encoding a putative zeatin O-glucosyltransferase. We found that OscZOG~ was preferentially expressed in shoot and root meristematic tissues and nascent organs. The growth of lateral roots was stimulated in the overexpression lines, but inhibited in RNA interference lines. In shoots, knockdown of OscZOG1 expression by RNA interference significantly im- proved tillering, panicle branching, grain number per panicle and seed size, which are important agronomic traits for grain yield. In contrast, constitutive expression of OscZOG1 leads to negative effects on the formation of the grain-yielding traits with a marked increase in the accumulation levels of cis-zeatin O-glucoside （cZOG） in the transgenic rice plants. In this study,our findings demonstrate the feasibility of improving the critical yield-determinant agronomic traits, including tiller number, panicle branches, total grain number per panicle and grain weight by downregulating the expression level of OscZOG1. Our results suggest that modulating the levels of cytokinin glucosylation can function as a fine-tuning switch in regulating the formation of agronomic traits in rice.

关键词： Cis-zeatin O-glucoside (cZOG) cytokinin glucosylation grain-yield traits lateral root panicle development rice

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Numerical analysis of added mass and damping of elastic hydrofoils

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Journal of Hydrodynamics 2020年第5期32卷 1009-1023页

作者： Jia-sheng Li ye-gao Qu Hong-xing hua School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships(DTSSS) Wuhan 430074China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

A numerical model is proposed for analyzing the effects of added mass and damping on the dynamic behaviors of *** coupled fluid-structure interactions(FSIs)of hydrofoils are analyzed by using the 3-D panel method for the fluid and the finite element method for the *** added mass and damping matrices due to the external fluid of the hydrofoil are asymmetric and computational *** computational inefficiencies associated with these asymmetric matrices are overcome by using a modal reduction technique,in which the first several wet mode vectors of the hydrofoil are employed in the analysis of the FSI *** discretized system of equations of motion for the hydrofoil are solved using the Wilson-6 *** present methods are validated by comparing the computed results with those obtained from the finite element *** is found that the stationary flow is sufficient for determining the wet modes of the hydrofoil under the condition of single-phase potential flow and without phase *** the case of relatively large inflow velocity,the added damping of the fluid can significantly affect the structural responses of the hydrofoil.

关键词： Fluid-structure interaction(FSI) hydroelastic response hydrofoil added mass added damping

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Feedback maximization of reliability of MDOF quasi integrable-Hamiltonian systems under combined harmonic and white noise excitations

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1245-1251页

作者： Lin-cong CHEN rong-hua huaN Wei-qiu ZHU Department of Mechanics State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

We studied the feedback maximization of reliability of multi-degree-of-freedom （MDOF） quasi integrable-Hamiltonian systems under combined harmonic and white noise excitations. First, the partially averaged Ito equations are derived by using the stochastic averaging method for quasi integrable-Hamiltonian systems under combined harmonic and white noise excitations. Then, the dynamical programming equation and its boundary and final time conditions for the control problems of maximizing the reliability is established from the partially averaged equations by using the dynamical programming principle. The nonlinear stochastic optimal control for maximizing the reliability is determined from the dynamical programming equation and control constrains. The reliability function of optimally controlled systems is obtained by solving the final dynamical programming equation. Finally, the application of the proposed procedure and effectiveness of the control strategy are illustrated by using an example.

关键词： Stochastic optimal control Dynamical programming Quasi integrable-Hamiltonian system Stochastic averaging Combined harmonic and white noise excitation Reliability

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