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Three-dimensional thermohaline structure estimation derived from HY-2 satellite data over the Maritime Silk Road and its applications

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Acta Oceanologica Sinica 2024年第5期43卷 41-53页

作者： Zhiqiang Chen xidong wang Xiangyu Wu Yuan Cao Zikang He Dakui wang Jian Chen Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210024China Laboratory for Regional Oceanography and Numercial Modeling Qingdao Marine Science and Technology CenterQingdao 266061China National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China Beijing Institute of Applied Meteorology Beijing 100029China

Estimated ocean subsurface fields derived from satellite observations provide potential data sources for operational marine environmental monitoring and prediction systems.This study employs a statistic regression reconstruction method,in combination with domestic autonomous sea surface height and sea surface temperature observations from the Haiyang-2(HY-2)satellite fusion data,to establish an operational quasi-realtime three-dimensional(3D)temperature and salinity products over the Maritime Silk Road.These products feature a daily temporal resolution and a spatial resolution of 0.25°×0.25°and exhibit stability and continuity.We have demonstrated the accuracy of the reconstructed thermohaline fields in capturing the 3D thermohaline variations through comprehensive statistical evaluations,after comparing them against Argo observations and ocean analysis data from 2022.The results illustrate that the reconstructed fields effectively represent seasonal variations in oceanic subsurface structures,along with structural changes resulting from mesoscale processes,and the upper ocean’s responses to tropical cyclones.Furthermore,the incorporation of HY-2 satellite observations notably enhances the accuracy of temperature and salinity reconstructions in the Northwest Pacific Ocean and marginally improves salinity reconstruction accuracy in the North Indian Ocean when compared to the World Ocean Atlas 2018 monthly climatology thermohaline fields.As a result,the reconstructed product holds promise for providing quasi-real-time 3D temperature and salinity field information to facilitate fast decisionmaking during emergencies,and also offers foundational thermohaline fields for operational ocean reanalysis and forecasting systems.These contributions enhance the safety and stability of ocean subsurface activities and navigation.

关键词： HY-2 satellite observations subsurface structures reconstruction Maritime Silk Road operational thermohaline product

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Temporal and spatial variation characteristics of Antarctic sea ice and the causes of its record decline during 2015–2016: a review

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Advances in Polar Science 2023年第1期34卷 5-16页

作者： YANG Yingyue LIU Hailong wang xidong School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Polar Research Institute of China Shanghai 200136China Key Laboratory for Polar Science MNRPolar Research Institute of ChinaShanghai 200136China Key Laboratory of Marine Hazards Forecasting MNRHohai UniversityNanjing 210024China College of Ocean Hohai UniversityNanjing 210098China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

Satellite observations over the past four decades have shown that the long-term trend of Antarctic sea ice extent(SIE)is opposite to the trend of sea ice extent in the Arctic.Arctic sea ice extent continues to decline while Antarctic SIE is generally on the rise except for a dramatic decline in 2015–2016.Based on the 40-year climatology from 1981 to 2020,Antarctic SIE anomaly in December 2016 is–2.1×10^(6) km^(2),reaching the minimum since 1979.There are many studies on the cause of this record decline.This present review summarizes the spatial and temporal characters of Antarctic sea ice and recaps major findings on the causes of record decline in 2015–2016 from the perspective of direct thermodynamic and dynamic process of atmosphere and ocean as well as the modulation of climate modes.Finally,the challenges and key scientific problems to be solved in the future of Antarctic sea ice research are presented.

关键词： Antarctic sea ice sea ice extent sea ice concentration climate variability

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Tropical Cyclone Genesis Potential Index over the Western North Pacific Simulated by CMIP5 Models

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Advances in Atmospheric Sciences 2015年第11期32卷 1539-1550页

作者： SONG Yajuan wang Lei LEI Xiaoyan wang xidong College of Physical and Environmental Oceanography Ocean University of China First Institute of Oceanography State Oceanic Administration State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences Key Laboratory of Marine Environment Information Technology State Oceanic Administration

Tropical cyclone （TC） genesis over the western North Pacific （WNP） is analyzed using 23 CMIP5 （Coupled Model Intercomparison Project Phase 5） models and reanalysis datasets. The models are evaluated according to TC genesis potential index （GPI）. The spatial and temporal variations of the GPI are first calculated using three atmospheric reanalysis datasets （ERA-Interim, NCEP/NCAR Reanalysis- 1, and NCEP/DOE Reanalysis-2）. Spatial distributions of July-October-mean TC frequency based on the GPI from ERA-interim are more consistent with observed ones derived from IBTrACS global TC data. So, the ERA-interim reanalysis dataset is used to examine the CMIP5 models in terms of reproducing GPI during the period 1982-2005. Although most models possess deficiencies in reproducing the spatial distribution of the GPI, their multi- model ensemble （MME） mean shows a reasonable climatological GPI pattern characterized by a high GPI zone along 20°N in the WNP. There was an upward trend of TC genesis frequency during 1982 to 1998, followed by a downward trend. Both MME results and reanalysis data can represent a robust increasing trend during 1982-1998, but the models cannot simulate the downward trend after 2000. Analysis based on future projection experiments shows that the GPI exhibits no significant change in the first half of the 21st century, and then starts to decrease at the end of the 21st century under the representative concentration pathway （RCP） 2.6 scenario. Under the RCP8.5 scenario, the GPI shows an increasing trend in the vicinity of 20°N, indicating more TCs could possibly be expected over the WNP under future global warming.

关键词： tropical cyclone genesis potential index CMIP5 western North Pacific global warming.

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Hydrothermal growth of well-aligned TiO_2 nanorod arrays: Dependence of morphology upon hydrothermal reaction conditions

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Rare Metals 2010年第3期29卷 286-291页

作者： LI Yuxiang ZHANG Mei GUO Min wang xidong Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China

Well-aligned TiO2 nanorod arrays （TNAs） were prepared on pretreated quartz substrates via hydrothermal method.The effect of the different preparation conditions on the growth morphologies of TNAs was systematically investigated by X-ray diffraction （XRD） and field-emission scanning electron microscopy （FE-SEM）.The photocatalytic properties were tested by photodegradation of a methyl blue solution.It is demonstrated that the hydrothermal reaction conditions,such as precursor concentration,hydrothermal reaction temperature,and hydrothermal reaction times,can greatly affect the growth of TNAs.Controlling the preparation process,TNAs with 2 μm in length and 140-170 nm in diameter and well-aligned orientation have been successfully prepared.The photocatalytic experiment results indicate that TNAs have much better photocatalytic activity than TiO2 nanoparticles.

关键词： titanium dioxide nanorod arrays hydrothermal method photocatalyst

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Effects of Stokes production on summer ocean shelf dynamics

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Acta Oceanologica Sinica 2014年第1期33卷 24-34页

作者： ZHANG Xuefeng HANGuijun wang xidong ZHANG Lianxin Key Laboratory of Marine Environmental Information Technology State Oceanic Administration National Marine Data and Information Service State Oceanic Administration

A two-dimensional numerical model,which is configured on the basis of Princeton ocean model（POM）,is used to study the effect of Stokes production（SP） of the turbulent kinetic energy on a density profile and Ekman transport in an idealized shelf region in summer.The energy input from SP is parameterized and included into the Mellor-Yamada turbulence closure submodel.Results reveal that the intensity of wind-driven upwelling fronts near the sea surface is weakened by the SP-associated turbulent kinetic energy input.The vertical eddy viscosity coefficient in the surface boundary layer is enhanced greatly owing to the impact of SP,which decreases the alongshore velocity and changes the distribution of upwelling.In addition,the SP-induced mixing easily suppresses the strong stratification and significantly increases the depth of the upper mixed layer（ML） under strong winds.

关键词： Stokes production POM upper mixed layer upwelling

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Conductivity properties of β-SiAlON ceramics

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Science China(Technological Sciences) 2012年第9期55卷 2409-2415页

作者： DONG PengLi wang xidong ZHANG Mei SESHADRI Seetharaman The Chinese Society for Metals Beijing 100711China College of Engineering Peking UniversityBeijing 100871China Department of Physical Chemistry University of Science and Technology BeijingBeijing 100083China Department of Materials Science Engineering Royal Institute of TechnologyStockholm SE 100-44Sweden

The thermal diffusivity and heat capacity of β-SiAlON ceramics with different Z values(0.6,1.5,3.0) were measured by laser flash technique and differential scanning calorimetry(DSC),respectively.The thermal conductivity of β-SiAlON was calculated from thermal diffusivity,heat capacity and density and it decreased and then kept almost constant with increasing of temperature.Two different models representing effective thermal conductivity were established and the various parameters of these models were simulated based on the results from the present work.The fitted regression lines were in good agreement with the experimental values.

关键词：导电性能陶瓷差示扫描量热法有效导热系数热扩散率热容量系数和 DSC

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Effects of PVP on the preparation and growth mechanism of monodispersed Ni nanoparticles

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Rare Metals 2008年第6期27卷 642-647页

作者： LIU Xiaodan GUO Min ZHANG Mei wang xidong GUO Xiao CHOU Kuochih Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China College of Engineering Peking University Beijing 100871 China

Monodispersed Ni nanoparticles were successfully prepared by chemical reduction with hydrazine hydrate in ethylene glycol. The effect of the amount of polyvinylpyrrolidone （PVP-K30） on the preparation of Ni nanoparticles was investigated. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and high resolution transmission electron microscopy （HRTEM） were employed to characterize the nickel powders. The average nickel particle size can be controlled from 103 nm to 46 ran with increasing the mass ratio of PVP to NiCl2·6H2O. The particles are spherical in shape and are not agglomerated. A possible extensive mechanism of nickel nanoparticle formation has been suggested.

关键词： Ni nanoparticles nucleation mechanism chemical reduction PVP

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Thermodynamic study and syntheses of β-SiAlON ceramics

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Science China(Technological Sciences) 2009年第11期52卷 3122-3127页

作者： DONG PengLi wang xidong ZHANG Mei GUO Min LI WenChao Department of Physical Chemistry University of Science and Technology BeijingBeijing 100083China Chinese Society for Metals Beijing 100711China College of Engineering Peking UniversityBeijing 100871China

Based on the thermodynamic study of β-SiAlON and one section of Si-Al-O-N phase diagram for Si/Al=9 at 1773 K, the pure β-SiAlON (Si6-ZAlZOZN8-Z) ceramics with different Z values (viz. 1.4, 1.8, 2.2, 2.6, 3.0) were synthesized at different temperatures using the pressure-less technique. The relationship of the experimental-saturated Z value (the maximum Z value at a constant temperature) with temperature was then discussed. The experimental results indicated that there is a good linear relationship between Z value and temperature, which is Z=_10.76+0.0071T (R=0.9985). The β-SiAlON stability regions at different temperatures were exhibited in a sketch phase diagram of Si3N4-SiO2-Al2O3-AlN system. In addi- tion, the relationship between experimental-saturated Z value and the lattice parameters was also characterized, and the linear regression results a=7.604+0.02872Z and c=2.908+0.02496Z were obtained, respectively.

关键词： SiAlON thermodynamics synthesis oxynitride

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Two-dimensional materials for future information technology: status and prospects

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Science China(Information Sciences) 2024年第6期67卷 1-147页

作者： Hao QIU Zhihao YU Tiange ZHAO Qi ZHANG Mingsheng XU Peifeng LI Taotao LI Wenzhong BAO Yang CHAI Shula CHEN Yiqi CHEN Hui-Ming CHENG Daoxin DAI Zengfeng DI Zhuo DONG xidong DUAN Yuhan FENG Yu FU Jingshu GUO Pengwen GUO Yue HAO Jun HE Xiao HE Jingyi HU Weida HU Zehua HU Xinyue HUANG Ziyang HUANG Ali IMRAN Ziqiang KONG Jia LI Qian LI Weisheng LI Lei LIAO Bilu LIU Can LIU Chunsen LIU Guanyu LIU Kaihui LIU Liwei LIU Sheng LIU Yuan LIU Donglin LU Likuan MA Feng MIAO Zhenhua NI Jing NING Anlian PAN Tian-Ling REN Haowen SHU Litao SUN Yue SUN Quanyang TAO Zi-Ao TIAN Dong wang Hao wang Haomin wang Jialong wang Junyong wang Wenhui wang Xingjun wang Yeliang wang Yuwei wang Zhenyu wang Yao WE Department of Applied Physics The Hong Kong Polytechnic University Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and EngineeringHunan University College of Integrated Circuits Zhejiang University Shenzhen Geim Graphene Center Shenzhen Key Laboratory of Layered Materials for Value-Added ApplicationsTsinghua-Berkeley Shenzhen Institute & Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua University State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZijingang CampusZhejiang University National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences CAS Key Laboratory of Nanophotonic Materials and Devices & Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences College of Chemistry and Chemical Engineering Hunan University Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Department of PhysicsRenmin University of China School of Integrated Circuits Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University School of Electronic Science and Engineering Nanjing University The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian University Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan University School of Integrated Circuits Huazhong University of Science and Technology Center for Nanochemistry (CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking University State Key Laboratory for Artificial Microstruct

Over the past 70 years, the semiconductor industry has undergone transformative changes,largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional(2D) materials like transition metal dichalcogenides(TMDs) and graphene are pivotal in overcoming the limitations of silicon-based technologies, offering innovative approaches in transistor design and functionality, enabling atomic-thin channel transistors and monolithic 3D integration. We review the important progress in the application of 2D materials in future information technology, focusing in particular on microelectronics and optoelectronics. We comprehensively summarize the key advancements across material production, characterization metrology, electronic devices, optoelectronic devices, and heterogeneous integration on silicon. A strategic roadmap and key challenges for the transition of 2D materials from basic research to industrial development are outlined. To facilitate such a transition, key technologies and tools dedicated to 2D materials must be developed to meet industrial standards, and the employment of AI in material growth, characterizations, and circuit design will be essential. It is time for academia to actively engage with industry to drive the next 10 years of 2D material research.

关键词： two-dimensional (2D) materials information technology production technology standardization of characterization microelectronicdevices optoelectronic devices multi-functional integration

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平菇在医药、化工、环境保护领域的研究进展

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食品与发酵工业 2024年第1期50卷 351-358页

作者：李坤鹏郭杨子王俊明王晨莹任喜东齐鲁工业大学(山东省科学院)生物基材料与绿色造纸国家重点实验室山东济南250353 齐鲁工业大学(山东省科学院)山东省微生物工程重点实验室山东济南250353 齐鲁工业大学(山东省科学院)食品科学与工程学院山东济南250353

平菇是一种具有多种突出优点的大型真菌,受到研究人员的广泛关注,并在医药、食品、化工、环境保护等领域得到了广泛的应用。主要原因是平菇中含有丰富的多糖、蛋白质、脂质、维生素、矿物质等营养成分,并且平菇中的某些营养成分还具有... 详细信息

平菇是一种具有多种突出优点的大型真菌,受到研究人员的广泛关注,并在医药、食品、化工、环境保护等领域得到了广泛的应用。主要原因是平菇中含有丰富的多糖、蛋白质、脂质、维生素、矿物质等营养成分,并且平菇中的某些营养成分还具有抗氧化、抗菌、抗炎、降血糖、免疫调节等活性,以及具有降解纤维素、吸附其生长环境中的有害污染物、富集重金属离子等特性。目前,平菇的研究热点主要集中在医药领域,如抗氧化药物、抗菌药物、抗炎药物、降血糖药物、免疫调节剂等药物的研制;化工领域,如化妆品、柔性材料、农药等的开发;环境保护领域,如木质纤维素的利用、土壤和水系的修复。该文就平菇营养成分及其在医药、化工、环境保护领域应用的最新研究进展作综述,为平菇在各领域的开发利用提供参考。未来应在开发利用平菇营养成分活性的同时,基于平菇自身及其生长特性探索在其他领域的应用。

关键词：平菇营养成分抗氧化药物免疫调节剂柔性材料生物发酵

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