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NUMERICAL SIMULATION OF 1998 RED TIDE OF THE BOHAI SEA

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International Journal of Sediment Research 2002年第3期17卷 175-185页

作者： Yongsheng wu,Zhao-Yin WANG Hydraulic Engineering Tsinghua University Beijing 100084 China Hydraulic Engineering Tsinghua University Beijing 100084 China

Algal bloom, known as red tide, has occurred frequently in the Bohai Sea in recent decades causing great economic losses to fisheries as well as having significant adverse impact on the environment. A 3-D Eco-Hydraulic model is developed to simulate the explosive propagation of diatom and dinoflagellate as a function of the concentration of various nutrients, river inflow, tide, temperature, wind, sunshine and rainfall. The model is intended to answer the questions of how the 1998 Bohai Sea red tide occurred, and to investigate how environmental factors, such as temperature, wind, rainfall, solar radiance, sea currents and nutrients, affect the algal bloom process. The parameters employed in the model are calibrated with the data collected in the periods 1982-1983 and 1992-1993. Results from the model indicate that eutrophication of the seawater is the basic condition for algal bloom, and that the 1998 red tide was triggered by the abnormal warm weather in August and September.

关键词： Algal bloom Eco-hydrodynamic model Bohai Sea Red tide Eutrophication

Influence of Kinematic Analysis Parameters of Drag Anchor Trajectory Prediction Using Yield Envelope Method

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China Ocean Engineering 2020年第2期34卷 257-266页

作者： wu Xiao-ni WANG Teng LIAO Qian LI Ye State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Naval Architecture and Offshore Engineering China University of Petroleum(East China)Qingdao 266580China

Drag anchor is widely applied in offshore engineering for offshore mooring *** prediction of the invisible trajectory during its drag-in installation is challenging for anchor design in determining the anchor final position for ensuring sufficient holding *** yield envelope method based on deep anchor failure for kinematic analysis was proposed as a promising trajectory prediction method for drag ***,there is a lack of analysis on the effects of the parameters applied in the kinematic *** current work studies the effects of the yield envelope parameters,anchor line bearing capacity factor and the anchor/soil interface *** is found that the accuracy of the yield envelope parameters has large impact on the prediction results based on deep yield *** of cases with smooth fluke predict deeper embedment depth than that from analyses of cases with rough *** decrease of the capacity factor results in the increase of the anchor embedment depth,the anchor line load,the anchor chain angle and the stable value of the normalized horizontal load component for the same drag length,while the stable value of the normalized vertical load component decreases when the capacity factor *** illustrates the importance in applying reasonable parameters and improving the method for more reliable prediction of the anchor trajectory.

关键词： trajectory prediction kinematic analysis drag anchor yield envelope

Expression profile analysis of 9 heat shock protein genes throughout the life cycle and under abiotic stress in rice

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Chinese Science Bulletin 2012年第4期57卷 336-343页

作者： YE ShuiFeng YU Shunwu SHU LieBo wu JinHong wu AiZhong LUO LiJun Shanghai Agrobiological Gene Center Shanghai 201106China School of Agriculture and Biology Shanghai Jiaotong UniversityShanghai 201101China Shanghai Academy of Agricultural Sciences Shanghai 201106China

Plant heat shock proteins (Hsps) facilitate protein folding or assembly under diverse developmental and adverse environmental conditions. Nine OsHsps were identified in our previous study from a proteomic analysis of rice cv. IRAT 109 leaf samples at the seedling stage under drought stress. To obtain additional information on the 9 OsHsp genes, this study focused on an expression profile analysis at different development stages throughout the life cycle of rice, and under different abiotic stresses and phyto-hormone treatments. The 9 genes exhibited distinctive expression patterns in different organs or development stages. Five of the genes (OsHsp72.90, OsHsp72.57, OsHsp71.18, OsHsp24.15 and OsHsp18.03) showed high expression in the endosperm, indicating that OsHsp genes may play important roles in rice seed development. All 9 OsHsps were up-regulated under heat, polyethylene glycol, and abscisic acid treatment, whereas salt stress caused up-regulation of 6 genes (OsHsp93.04, OsHsp71.10, OsHsp71.18, OsHsp72.57, OsHsp24.15 and OsHsp18.03) and cold stress resulted in down-regulation of OsHsp93.04 and OsHsp72.57. These diverse expression profiles imply potential functional diversity of the Hsp gene family in rice.

关键词：表达谱分析热休克蛋白蛋白基因水稻品种生命周期逆境蛋白质折叠蛋白质组分

Pulse shaping method to compensate for antenna distortion in ultra-wideband communications

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Science in China(Series F) 2007年第6期50卷 878-888页

作者： wu XuanLi SHAXueJun ZHANG NaiTong Communication Research Center Harbin Institute of Technology Harbin 150001 China

In the ultra-wideband （UWB） communication systems, a critical spectral mask is released to restrict the allowable interference to other wireless devices by the Federal Communications Commission （FCC）, and then some pulse shaping methods have been presented to fulfil the mask. However, most pulse shaping methods do not consider the antenna distortion which cannot be neglected in the UWB communication systems compared with the conventional systems. To this end, an orthogonal wavelet based pulse shaping method is proposed in this paper to inte- grate compensation of antenna distortion into pulse shaping. Simulation results show that the novel pulse shaping method can be used to achieve compensation for antenna distortion, optimization of transmission power spectrum, and simplification of the algorithm, as well as simple implementation of the pulse generator.

关键词： ultra-wideband pulse shaping antenna distortion orthogonal wavelet

Room-temperature multiferroicity and diversified magnetoelectric couplings in 2D materials

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National Science Review 2020年第2期7卷 373-380页

作者： Tingting Zhong Xiaoyong Li Menghao wu Jun-Ming Liu School of Physics and wuhan National High Magnetic Field Center Huazhong University of Science and Technology Laboratory of Solid State Microstructures Nanjing University

Multiferroics are rare in nature due to the mutual exclusive origins of magnetism and ferroelectricity. The simultaneous coexistence of robust magnetism/ferroelectricity and strong magnetoelectric coupling in single multiferroics is hitherto unreported, which may also be attributed to their potential conflictions. In this paper, we show the first-principles evidence of such desired coexistence in ultrathin-layer CuCrS2and CuCrSe2. The vertical ferroelectricity is neither induced by an empty d shell nor spin-driven, giving rise to an alternative possibility of resolving those intrinsic exclusions and contradictions. Compared with their bulk phases, the ferromagnetism in the thin-layer structures(two–six layers) can be greatly stabilized due to the enhanced carrier density and orbital shifting by vertical polarization, and the Curie temperatures of both ferromagnetism and ferroelectricity can be above room temperature. Moreover, a considerable net magnetization can be reversed upon ferroelectric switching, where the change in spin-resolved band structure also renders efficient ‘magnetic reading + electrical writing’. The thickness-different layers may even exhibit diversified types of magnetoelectric coupling, which both enriches the physics of multiferroics and facilitates their practical applications.

关键词： 2D multiferroics room-temperature ferromagnetism and ferroelectricity diversified magnetoelectric couplings vertical polarizations first-principles calculations

Analysis of the Microstructure of a Failed Cement Sheath Subjected to Complex Temperature and Pressure Conditions

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Fluid Dynamics & Materials Processing 2023年第2期19卷 399-406页

作者： Zhiqiang wu Yi wu Renjun Xie Jin Yang Shujie Liu Qiao Deng China University of Petroleum Beijing102249China CNOOC Research Institute Beijing100027China Zhanjiang Branch CNOOC Energy Technology&Services LimitedZhanjiang524057China Yangtze University Wuhan430100China

One of the main obstacles hindering the exploitation of high-temperature and high-pressure oil and gas is the sealing integrity of the cement *** the microstructure of the cement sheath is therefore an important *** this study,the microstructure of the cement sheath is determined using a CT scanner under different temperature and pressure *** results suggest that the major cause of micro-cracks in the cement is the increase in the casing *** the micro-cracks accumulate to a certain extent,the overall structure of the cement sheath is weakened,resulting in gas channeling,which poses a direct threat to the safe production of oil and gas.A change in the casing temperature has a limited effect on the microstructure of the cement sheath.

关键词： Cement sheath microstructure experimental study mesh model CT scan

The development,performances and applications of the monochromatic X-rays facilities in(0.218–301)keV at NIM,China

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Nuclear Science and Techniques 2021年第6期32卷 108-121页

作者： Si-Ming Guo Jin-Jie wu Dong-Jie Hou National Institute of Metrology BeijingChina

Space scientific exploration is rapidly becoming the primary battlefield for humankind to explore the *** worldwide have launched numerous space exploration *** calibration of the detectors on the ground is a crucial element for space science satellites to obtain observational *** the purpose of providing calibration for various satellite-borne detectors,multiple monochromatic X-rays facilities have been built at the National Institute of Metrology,***(NIM).These facilities mainly pertain to grating diffraction and Bragg diffraction,and the energy range of the produced monochromatic X-rays is 0.218–301 ke *** facilities have a high performance in terms of energy stability,monochromaticity,and flux *** monochromaticity was greater than 3.0%.The energy stability of the facility is 0.02%at 25 ke V over 8 h,and the flux stability was within 1.0%at 25 ke V over 8 *** experiments on the properties of satellite-borne detectors,such as energy linearity,energy resolution,detection efficiency,and temperature response,can be conducted at the *** far,the calibration of two satellites has been completed by the authors,and the work on three other satellites is in *** study will contribute to the advancement of X-ray astronomy the development of Chinese space science.

关键词： Monochromatic X-rays Monochromator Bragg diffraction Energy spectra Calibration

Correlation analysis between underwater noise and Liutex for DTMB4119 propeller

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Journal of Hydrodynamics 2022年第4期34卷 585-595页

作者： Lian-jie Yu Jian-wei wu De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China wuhan Second Ship Design and Research Institute Wuhan 430205China

Propeller is an important equipment of ocean *** has characteristics of complex geometry and periodic vortex shed,which means high research *** paper takes DTMB419 propeller as the research object.A detailed study is conducted on the wake vortices in non-cavitation state and cavitation *** vortex identification methods are used to compare the vortices capture effects from downstream sections and three-dimensional *** results show that,the third-generation vortex identification technologyΩ_(R)shows obvious *** the same time,FW-H equation is used to predict propeller noise,and the relationship between nonlinear sound source distribution and vortices distribution is *** is found that the distribution of Lighthill tensor is consistent withΩ_(R),which proves the advantages and potential of third-generation vortex identification technology from acoustic perspective.

关键词： Third-generation vortex DTMB4119 propeller cavitation FW-H formulation

Qianjin Wenwu decoction suppresses renal interstitial fibrosis by enhancing the degradation of extracellular matrix in mice with unilateral ureteral obstruction

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Chinese Journal of Natural Medicines 2023年第4期21卷 253-262页

作者： JIN Chengshan wu Xiaotian YOU Yue WANG Yuing wu Jing ZUO Along ZHENG Yan GUO Jianpeng Key Laboratory of Natural Medicines of the Changbai Mountain Ministry of EducationCollege of PharmacyYanbian UniversityYanji 133002China Yanbian University Hospital Yanji 133002China Yanbian Medical and Health Industry Pilot Base College of PharmacyYanbian UniversityYanji 133002China Yanbian Chaoyao Biotechnology Co. Ltd.Yanji 133002China

Diabetic kidney disease(DKD)is the most common complication of diabetes mellitus(DM).Qianjin Wenwu decoction(QWD),a well-known traditional Korean medicine,has been used for the treatment of DKD,with satisfactory therapeutic *** study was designed to investigate the active components and mechanisms of action of QWD in the treatment of *** results demonstrated that a total of 13 active components in five types were found in QwD,including flavonoids,flavonoid glycosides,phenylpropionic acids,saponins,coumarins,and *** key proteins,TGF-β1 and TIMP-1,were identified as the target proteins through molecular ***,QWD significantly suppressed Scr and BUN levels which increased after unilateral ureteral obstruction(UUO).Hematoxylin&eosin(H&E)and Masson staining results demonstrated that QWD significantly alleviated renal interstitial fibrosis in UUO *** also found that QWD promoted ECM degradation by regulating MMP-9/TIMP-1 homeostasis to improve renal tubulointerstitial fibrosis and interfere with the expression and activity of TGF-βl in DKD *** findings explain the underlying mechanism of QWD for the treatment of DKD,and also provide methodological reference for investigating the mechanism of traditional medicine in the treatment of DKD.

关键词： QianJin Wenwu Decoction(QWD) Diabetic kidney disease(DKD) Pharmacodyamic material basis Molecular docking TGF-β1 Extracellular matrix(ECM)