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On the longitudinal shifts of the Agulhas retroflection point

Acta Oceanologica Sinica 2024年第5期43卷 16-29页

作者： Weiwei Zhang Xiaoyi yang Wei Zhuang xiaohai yan State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361002China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Center for Remote Sensing College of EarthOcean and EnvironmentUniversity of DelawareNewarkDE 19716USA Joint Center for Remote Sensing University of Delaware-Xiamen UniversityNewarkDE 19716USA and Xiamen 361002China

The Agulhas system is the strongest western boundary current system in the Southern Hemisphere and plays an important role in modulating the Indian-to-Atlantic Ocean water exchange by the Agulhas leakage.It is difficult to measure in situ transport of the Agulhas leakage as well as the Agulhas retroflection position due to their intermittent nature.In this study,an innovative kinematic algorithm was designed and applied to the gridded altimeter observational data,to ascertain the longitudinal position of Agulhas retroflection,the stability of Agulhas jet stream,as well as its strength.The results show that the east-west shift of retroflection is related neither to the strength of Agulhas current nor to its stability.Further analysis uncovers the connection between the westward extension of Agulhas jet stream and an anomalous cyclonic circulation at its northern side,which is likely attributed to the local wind stress curl anomaly.To confirm the effect of local wind forcing on the east-west shift of retroflection,numerical sensitivity experiments were conducted.The results show that the local wind stress can induce a similar longitudinal shift of the retroflection as altimetry observations.Further statistical and case study indicates that whether an Agulhas ring can continuously migrate westward to the Atlantic Ocean or re-merge into the main flow depends on the retroflection position.Therefore,the westward retroflection may contribute to a stronger Agulhas leakage than the eastward retroflection.

关键词： Agulhas system Agulhas leakage retroflection position local wind stress curl

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Relative contributions of temperature and salinity to steric sea level over the South China Sea

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Journal of Oceanology and Limnology 2022年第2期40卷 428-437页

作者： Jin SHA Xiaoming LI xiaohai yan Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Hainan Key Laboratory of Earth Observation Sanya 502022China Center for Remote Sensing College of EarthOcean and EnvironmentUniversity of DelawareNewark 19711DEUSA Joint Institute for Coastal Research and Management University of Delaware/Xiamen UniversityUSA/China

The relative contributions of surface temperature and salinity to steric sea-level variations are investigated using satellite observations and reanalysis datasets.By defi ning a contribution factor,the relative roles of thermal and haline steric height variations are quantifi ed over the South China Sea(SCS).The thermosteric height dominates the steric sea level variation in the northern SCS deep basin,while the contribution of the halosteric height increases southward.Further investigation reveals that this transition is related to the meridional imbalance of surface heat flux and precipitation variations.The revealed steric constitution distribution is not confi ned to the surface but extends within the upper layer to approximately 50m depth,and then the thermosteric component dominates from the depth underneath.The results of this study clarify the steric sea level constitution over the SCS,benefit the understanding of sea-level variations at the regional scale,and may further facilitate multisensor remote sensing data mining studies.

关键词： South China Sea(SCS) steric height steric constitution

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Modeling the contribution of the microbial carbon pump to carbon sequestration in the South China Sea

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Science China Earth Sciences 2018年第11期61卷 1594-1604页

作者： Wenfang LU Yawei LUO xiaohai yan Yuwu JIANG State Key Laboratory of Marine Environmental Science College of Ocean and Earth Sciences Xiamen University Center for Remote Sensing College of Earth Ocean and Environment University of Delaware Joint Institute for Coastal Research and Management Xiamen University Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education National Engineering Research Centre of Geospatial Information Technology Fuzhou University

The two key mechanisms for biologically driven carbon sequestration in oceans are the biological pump(BP) and the microbial carbon pump(MCP); the latter is scarcely simulated and quantified in the China seas. In this study, we developed a coupled physical-ecosystem model with major MCP processes in the South China Sea(SCS). The model estimated a SCSaveraged MCP rate of 1.55 mg C m^(-2) d^(-1), with an MCP-to-BP ratio of 1:6.08 when considering the BP at a depth of 1000 m.Moreover, the ecosystem responses were projected in two representative global warming scenarios where the sea surface temperature increased by 2 and 4°C. The projection suggested a declined productivity associated with the increased near-surface stratification and decreased nutrient supply, which leads to a reduction in diatom biomass and consequently the suppression of the BP. However, the relative ratio of picophytoplankton increased, inducing a higher microbial activity and a nonlinear response of MCP to the increase in temperature. On average, the ratio of MCP-to-BP at a 1000-m depth increased to 1:5.95 with surface warming of 4°C, indicating the higher impact of MCP in future ocean carbon sequestration.

关键词：微生物华南海海表面温度碳建模泵生态系统比率估计

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双区与单区电除尘器内部流场电场对比研究

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中国电机工程学报 2024年第3期44卷 1070-1080,I0018页

作者：闫东杰袁良宇张晓海玉亚庄倩陕西省环境工程重点实验室(西安建筑科技大学环境与市政工程学院) 陕西省西安市710055

电除尘器内部电场和流场特性对除尘器的除尘性能有重要影响。该文使用Fluent模拟软件对相同比尘集面积的单区与双区电除尘器进行数值模拟,对比单区和双区电除尘器的电场强度、电流密度分布和不同电场风速下的内部流场变化,以此分析电除... 详细信息

电除尘器内部电场和流场特性对除尘器的除尘性能有重要影响。该文使用Fluent模拟软件对相同比尘集面积的单区与双区电除尘器进行数值模拟,对比单区和双区电除尘器的电场强度、电流密度分布和不同电场风速下的内部流场变化,以此分析电除尘器对不同粒径颗粒除尘效率的影响和双区电除尘器能够高效率捕集高比电阻粉尘的原因。结果表明,双区电除尘器荷电区电流密度与电场强度和单区电除尘器分布相似,单区电除尘器的平均板电流密度为0.56 mA/m^(2),平均电场强度为2.20 kV/cm,双区电除尘器荷电区的平均板电流密度为0.51 mA/m^(2),平均电场强度为2.40 kV/cm。但双区电除尘器收尘区的电场与流场特性和单区电除尘器差别较大,双区电除尘器收尘区平均板电流密度为0.0036 mA/m^(2),只为单区电除尘器的0.6%,而平均电场强度为4.0 kV/cm,是单区电除尘器场强的1.8倍,且双区电除尘收尘区流场分布较均匀,受离子风影响小。收尘区内低电流密度,高电场强度,较少的离子风扰动是双区电除尘器有效捕集高比电阻粉尘,避免反电晕发生的主要原因。

关键词：双区电除尘器单区电除尘器电流密度流场反电晕

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Analysis of brain-stem auditory evoked potential and visual evoked potential in patients with Parkinson disease

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Neural Regeneration Research 2006年第5期1卷 449-452页

作者： Qiaorong Deng Jianzhong Deng yanmin Zhao xiaohai yan Pin Chen Department of Anesthesiology Henan Provincial Tumor Hospital Zhengzhou 450008 Henan Province China Department of Neurology Anyang District Hospital Anyang 455000 Henan Province. China

BACKGROUND： With the development of neuroelectrophysiology, it had been identified that all kinds of evoked potentials might reflect the functional status of corresponding pathway. Evoked potentials recruited in the research of PD, it can be known whether other functional pathway of nervous system is impaired. OBJECTIVE： To observe whether brainstem auditory and visual passageway are impaired in patients with Parkinson disease （PD）, and compare with non-PD patients concurrently. DESIGN ： A non-randomized concurrent controlled observation. SETTINGS： Henan Provincial Tumor Hospital; Anyang District Hospital.PARTICIPANTS： Thirty-two cases of PD outpatients and inpatients, who registered in the Department of Neurology, Anyang District Hospital from October 1997 to February 2006, were enrolled as the PD group, including 20 males and 12 females, aged 50-72 years old. Inclusive criteria： In accordance with the diagnostic criteria of PD recommended by the dyskinesia and PD group of neurology branch of Chinese Medical Association. Patients with diseases that could cause Parkinson syndrome were excluded by CT scanning or MRI examination. Meanwhile, 30 cases with non-neurological disease were selected from the Department of Internal Medicine of our hospital as the control group, including 19 males and 11 females, aged 45-70 years old. Including criteria： Without history of neurological disease or psychiatric disease; showing normal image on CT. And PD, Parkinson syndrome and Parkinsonism-plus were excluded by professional neurologist. All the patients were informed and agreed with the examination and clinical observation.METHODS： The electrophysiological examination and clinical observation of the PD patients and controls were conducted. The Reporter type 4-channel evoked potential machine （Italy） was used to check brain-stem auditory evoked potential （BAEP） and visual evoked potential （VEP）. Why to be examined was explained to test taker. BAEP recording electrode was placed at Cz, while the reference one placed a

关键词： Parkinson disease visual evoked potential clinical observation evoked potentials District Hospital reference electrode diagnostic criteria measurement data nervous system CT scanning

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江西九连山森林水果和野生蔬菜初探

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生物灾害科学 2024年第2期47卷 310-320页

作者：徐国良张晓海宋育英卓小海颜福林江西九连山国家级自然保护区管理局江西龙南341700 江西永新县高桥楼镇人民政府农业农村办公室江西永新343400 江西永新县高溪乡人民政府农业农村办公室江西永新343400

【目的】森林水果和野生蔬菜是森林大食物观中粮食的重要组成部分,为了调查统计江西九连山分布的森林水果和野生蔬菜资源组成和种数。【方法】采用路线调查法对公路两侧、常绿阔叶林和针叶林等各种林分中的森林水果和野生蔬菜进行摄影... 详细信息

【目的】森林水果和野生蔬菜是森林大食物观中粮食的重要组成部分,为了调查统计江西九连山分布的森林水果和野生蔬菜资源组成和种数。【方法】采用路线调查法对公路两侧、常绿阔叶林和针叶林等各种林分中的森林水果和野生蔬菜进行摄影、采集标本,记录其地理位置、种群数量和生境信息。【结果】建立了九连山森林水果和野生蔬菜名录;分析了江西九连山森林水果和野生蔬菜的科属结构、地理区系、生活型、营养和药用价值,并统计了九连山地区森林水果的果期,同时提出了九连山森林水果和野生蔬菜的开发建议。【结论】江西九连山森林水果资源和野生蔬菜资源丰富,营养药用价值高,开发潜力大,可为保障粮食安全提供数据支撑和实践指导。

关键词：九连山森林水果野生蔬菜科属结构地理区系果实成熟期营养药用价值

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Phase-separated bienzyme compartmentalization as artificial intracellular membraneless organelles for cell repair

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Science China Chemistry 2023年第3期66卷 845-852页

作者： yanwen Zhang Shixin Wang Yuling yan Xiaoxiao He Zefeng Wang Shaohong Zhou xiaohai yang Kemin Wang Jianbo Liu State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringKey Laboratory for Bio-Nanotechnology and Molecular Engineering of Hunan ProvinceHunan UniversityChangsha 410082China

Implanting artificial organelles in living cells is capable of correcting cellular dysfunctionalities for cell repair and biomedical applications. In this work, phase-separated bienzyme-loaded coacervate microdroplets are established as a model of artificial membraneless organelles in endothelial dysfunctional cells for the cascade enzymatic production of nitric oxide(NO) with a purpose of correcting cellular NO deficiency. We prepared the coacervate microdroplets via liquid-liquid phase separation of oppositely charged polyelectrolytes, in which glucose oxidase/horseradish peroxidase-mediated cascade reaction was compartmented. After the coacervate microdroplets were implanted in NO-deficient dysfunctional cells, the compartments maintained a phase-separated liquid droplet structure, which facilitated a significant enhancement of NO production in the dysfunctional cells. The recovery of NO production was further exploited to inhibit clot formation in blood plasma located in the cell suspension. This demonstrated a proof-of-concept design of artificial organelles in dysfunctional cells for cell repair and anticoagulation-related medical applications. Our results demonstrate an approach for the construction of coacervate droplets through phase separation for the generation of artificial membraneless organelles, which can be designed to provide an array of functionalities in living organisms that have the potential to be used in the field of cell engineering and medical therapy.

关键词： artificial membraneless organelles coacervate microdroplets nitric oxide liquid-liquid phase separation cell repair

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兼顾江汉平原水稻产量和品质提高的优化施锌量研究

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河南农业科学 2024年第3期53卷 43-52页

作者：刘越周梦罗海伟党程成郝蓉蓉胡玉婷严鹏陈龙周刘洋旋田小海长江大学农学院湖北荆州434025 长江大学主要粮食作物产业化湖北省协同创新中心湖北荆州434025 大悟楚才高中湖北孝感432000 湖北省智慧农业有限公司湖北武汉430000

在大田条件下,以4个水稻品种(立香85、象牙香占、合两优927、昌两优8号)为试验材料,通过基施锌肥研究不同施锌量[0 kg/hm^(2)(CK)、7.5 kg/hm^(2)(Zn1)、15 kg/hm^(2)(Zn2)、30 kg/hm^(2)(Zn3)]下水稻产量、品质的变化,为江汉平原优质... 详细信息

在大田条件下,以4个水稻品种(立香85、象牙香占、合两优927、昌两优8号)为试验材料,通过基施锌肥研究不同施锌量[0 kg/hm^(2)(CK)、7.5 kg/hm^(2)(Zn1)、15 kg/hm^(2)(Zn2)、30 kg/hm^(2)(Zn3)]下水稻产量、品质的变化,为江汉平原优质稻锌肥施用提供理论依据。结果表明,施锌可以显著提高水稻产量,且水稻产量随着施锌量的增加呈先上升后降低的趋势,总体上以Zn2处理最高,Zn1处理次之。立香85、合两优927、昌两优8号以Zn2处理产量最高;象牙香占以Zn1处理产量最高,Zn2处理次之。施锌处理产量较CK增加了8.1%~28.8%。施锌对稻米加工品质有明显的改善作用,整体以Zn1和Zn2处理下糙米率、精米率、整精米率较高。不同施锌处理下直链淀粉含量因品种而异,其中,立香85以Zn1处理最高,昌两优8号以Zn2处理最高,象牙香占和合两优927以Zn3处理最高。对于淀粉RVA谱特征值,立香85、象牙香占、昌两优8号均以Zn1处理崩解值最高;消减值表现为立香85和合两优927在CK下最低,象牙香占和昌两优8号在Zn1处理下最低。各品种粗蛋白含量随施锌量的增加呈先升高后降低的趋势,其中,立香85、合两优927均以Zn1处理粗蛋白含量最高,象牙香占和昌两优8号均以Zn2处理粗蛋白含量最高。总体上,清蛋白、球蛋白和醇溶蛋白含量均以Zn2处理最高,谷蛋白含量以Zn1处理最高。糙米、精米锌含量也随着施锌量的增加呈现先增加后降低的趋势。其中,立香85、合两优927均以Zn1处理糙米锌含量最高,分别为23.1、19.8 mg/kg;象牙香占和昌两优8号均以Zn2处理最高,分别为20.0、17.7mg/kg。各品种糙米锌含量均大于精米锌含量。综合水稻产量、品质等多方面因素来看,江汉平原施锌处理以Zn1—Zn2为优,施锌量为7.5~15 kg/hm^(2)。

关键词：水稻锌肥产量品质锌含量

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Global air-sea surface carbon dioxide transfer velocity and flux estimated using 17 a altimeter data and a new algorithm

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Acta Oceanologica Sinica 2013年第10期32卷 24-33页

作者： YU Tan HE Yijun yan xiaohai Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences School of Marine Sciences Nanjing University of Information Science and Technology Key Laboratory of Chinese Academy of Sciences for Ocean Circulation and Waves (KLOCAW ) Institute of OceanologyChinese Academy of Sciences College of Marine Sciences Shanghai Ocean University Center for Remote Sensing University of Delaware

The global distributions of the air-sea CO2 transfer velocity and flux are retrieved from TOPEX/Poseidon and Jason altimeter data from October 1992 to December 2009 using a combined algorithm. The 17 a average global, area-weighted, Schmidt number-corrected mean gas transfer velocity is 21.26 cm/h, and the full exploration of the uncertainty of this estimate awaits further data. The average total CO2 flux （calculated by carbon） from atmosphere to ocean during the 17 a was 2.58 Pg/a. The highest transfer velocity is in the circumpolar current area, because of constant high wind speeds and currents there. This results in strong CO2 fluxes. CO2 fluxes are strong but opposite direction in the equatorial east Pacific Ocean, because the air-sea CO2 partial pressure difference is the largest in the global cceans. The results differ from the previous studies calculated using the wind speed. It is demonstrated that the air-sea transfer velocity is very important for estimating air-sea CO2 flux. It is critical to have an accurate estimation for improving calculation of CO2 flux within climate change studies.

关键词： altimeter remote sensing sea surface carbon dioxide transfer velocity carbon dioxide flux

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鄂尔多斯盆地环县西部地区延10储层特征及影响因素分析

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石油地质与工程 2024年第1期38卷 50-56页

作者：田伟魏钦廉陈曦尚晓海车雨恒西安石油大学地球科学与工程学院陕西西安710065 陕西省油气成藏地质学重点实验室陕西西安710065 延长油田股份有限公司定边采油厂陕西榆林718699 中国石油长庆油田分公司第十二采油厂甘肃庆阳745400

为了研究鄂尔多斯盆地环县西部地区延10储层特征,通过铸体薄片、扫描电镜以及圧汞分析等实验分析方法,对环县西部地区侏罗系延10储层特征及影响因素进行了系统研究。结果表明,区内延10储层主要岩石类型为长石岩屑砂岩和岩屑砂岩,填隙物... 详细信息

为了研究鄂尔多斯盆地环县西部地区延10储层特征,通过铸体薄片、扫描电镜以及圧汞分析等实验分析方法,对环县西部地区侏罗系延10储层特征及影响因素进行了系统研究。结果表明,区内延10储层主要岩石类型为长石岩屑砂岩和岩屑砂岩,填隙物主要由黏土矿物胶结物和硅质胶结物组成;孔隙度为5.02%~19.07%,渗透率为0.15×10^(-3)~1 176.80×10^(-3)μm^(2),为中-低孔隙度、中-低渗透率的常规碎屑岩储层;储集空间类型以粒间孔、长石溶孔以及晶间孔为主,孔隙结构以Ⅰ类和Ⅱ类为主;区内主要发育辫状河沉积体系,中部主河道及主河道交汇处储层物性最好,有利储层主要分布于心滩沉积微相区域;储层物性主要受沉积作用和成岩作用影响,强烈的压实作用以及黏土矿物胶结物、硅质胶结物、碳酸盐胶结物的形成是使储层孔隙度降低的主要原因,而绿泥石膜的形成以及长石和岩屑的溶解则有利于改善储层物性条件;区内延10段储层已达中成岩阶段A期。

关键词：鄂尔多斯盆地环县西部延10段储层特征

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