检索结果-南通市图书馆

Advances in Atmospheric Sciences 2024年第3期41卷 509-528页

作者： Guojing LI Dongxiao WANG Changming DONG jiayi pan Yeqiang SHU Zhenqiu ZHANG State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Shool of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China School of Geography and Environment Jiangxi Normal UniversityNanchang 330022China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China

The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and wave fields are studied.The results show that the intense wind and wave fields further break the symmetries of submesoscale flow fields and suppress the levels of filament frontogenesis. The changes of secondary circulation directions—that is, the conversion between the convergence and divergence of the surface cross-filament currents with the downwelling and upwelling jets in the filament center—are associated with the inertial oscillation. The filament frontogenesis and frontolysis caused by the changes of secondary circulation directions may periodically sharpen and smooth the gradient of submesoscale flow fields.The lifecycle of the cold filament may include multiple stages of filament frontogenesis and frontolysis.

关键词： cold filament frontogenesis frontolysis large eddy simulation

Multi-regional observations and validation of the M_(3)ocean tide

在线全文

学校读者我要写书评

暂无评论

中国科学:地球科学英文版 2023年第10期66卷 2265-2277页

作者： Adam Thomas DEVLIN jiayi pan Déborah IDIER School of Geography and Environment Jiangxi Normal UniversityNanchang330022China Cooperative Institute for Marine and Atmospheric Research School of Ocean and Earth Science and TechnologyUniversity of Hawai’i at MānoaHonoluluHI96822USA Department of Oceanography University of Hawai’i at MānoaHonoluluHI96822USA The Chinese University of Hong Kong Hong Kong999077China Key Laboratory of Poyang Lake Wetland and Watershed Research of Ministry of Education Nanchang330022China BRGM Orléans45060France

Improved determinations of the oft-ignored third-degree ocean tides can yield better accuracy for tidal predictions,numerical model solutions,and geodesy.While only a small part of tidal range,these components can be larger at certain coastal locations due to shelf resonances and other effects.Here,we discuss observations of the M3lunar terdiurnal tide using 9-year windowed tidal harmonic analyses at 157 tide gauges compares to a global assimilation model(TPXO9v5a),with a focus on the Western Pacific and the European Shelf.TPXO9v5a does well in estimating the observed M_(3)amplitudes and phase lags in most regions,though determinations in coastal zones and in morphologically complex areas are coarse and often inaccurate.We also employ a shallow-water model(MARS)on the European Shelf,which can yield localized improvement over TPXO.In five subregions of the European Shelf,regional root-mean-squared-errors(RMSEs)are lower(and thus a better fit)at three locations for TPXO for amplitudes,and three for phase lags,with MARS simulations being a better fit in the other subregions.We also show that some locations have experienced significant long-term increases and/or decreases in the M_(3)amplitude over time,likely related to resonance changes under sea level rise(SLR)which can modulate the oceanic response to astronomical forcing.This hypothesis is explored for Europe using the MARS model by applying various sea level rise scenarios,showing that the directionality(positive or negative)of the long-term changes in M_(3)amplitudes over time match the model results for more than half of our validation stations.

关键词： Third-degree tides M_(3)tide Altimetry Numerical simulation Sea level rise

Influence of the upper mixed layer depth on Langmuir turbulence characteristics

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 17-37页

作者： Guojing LI Changming DONG jiayi pan Adam T.DEVLIN Dongxiao WANG State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Nanjing University of Information Science and Technology Nanjing 210044China Institute of Space and Earth Information Science the Chinese University of Hong KongHong Kong 999077China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 510301China

The upper mixed layer depth(h)has a significant seasonal variation in the real ocean and the low-order statistics of Langmuir turbulence are dramatically influenced by the upper mixed layer depth.To explore the influence of the upper mixed layer depth on Langmuir turbulence under the condition of the wind and wave equilibrium,the changes of Langmuir turbulence characteristics with the idealized variation of the upper mixed layer depth from very shallow(h=5 m)to deep enough(h=40 m)are studied using a non-hydrostatic large eddy simulation model.The simulation results show that there is a direct entrainment depth induced by Langmuir turbulence(h_(LT))within the thermocline.The normalized depthaveraged vertical velocity variance is smaller and larger than the downwind velocity variance for the ratio of the upper mixed layer to a direct entrainment depth induced by Langmuir turbulence h/h_(LT)1,respectively,indicating that turbulence characteristics have the essential change(i.e.,depth-averaged vertical velocity variance(DAVV)DADV for Langmuir turbulence)between h/h_(LT)1.The rate of change of the normalized depth-averaged low-order statistics for h/h_(LT)1.The reason is that the downward pressure perturbation induced by Langmuir cells is strongly inhibited by the upward reactive force of the strong stratified thermocline for h/h_(LT)1.Hence,the upper mixed layer depth has significant influences on Langmuir turbulence characteristics.

关键词： the upper mixed layer depth Langmuir turbulence turbulent characteristics large eddy simulation

Introduction to the Special Issue： Coastal and Marginal Sea Studies

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2015年第4期9卷 591-593页

作者： jiayi pan Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong China

1 Introduction As an important part of the ocean system, the coastal and marginal sea （CMS） is a junction between land and the open ocean where the ocean-land interaction occurs, and also it is the area with substantial marine- economic activities for many countries. The development of marine economics greatly affects the CMS environment and causes deteriorating environmental problems. The study on the CMS helps to understand how the land and ocean interact, and how the marine environment responses to the land system change resulting from economic developments in coastal regions. Therefore, deeply understanding physical properties of the CMS is of great importance not only in the earth science study, but for marine environmental protection.

关键词： Introduction Special Issue Coastal

An ultraviolet to visible scheme to estimate chromophoric dissolved organic matter absorption in a Case-2 water from remote sensing reflectance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2020年第2期14卷 384-400页

作者： Xia LEI jiayi pan Adam DEVLIN Institute of Space and Earth Information Science The Chinese University of Hong KongHong KongChina School of Geography and Environment Jiangxi Normal UniversityNanchang 330022China

In a typical Case-2 coastal water environment(here,the Pearl River Estuary(PRE),China),chromophoric dissolved organic matter(CDOM)and suspended particulates dominate the water optical properties,and CDOM fluorescence contributes considerably to surface water reflectance.In this paper,an ultraviolet(UV)to visible scheme to retrieve CDOM absorption(ag)is developed based on a set of in situ observations.First,the CDOM UV absorption and spectral slope(Sg)are derived directly from the visible remote sensing reflectance;then the Sg is extrapolated to obtain the spectrum from UV to visible spectral range.This algorithm performs well,with an overall mean absolute percent difference(MAPD)of^30%,~5%and^6%for the estimation of ag in 250–450 nm,Sg over 250–400 nm,and 250–700 nm,respectively.The effectiveness and stability of the algorithm is further demonstrated in capturing the distribution pattern of CDOM absorption in the PRE from satellite ocean color imagery with multiple spatial and spectral resolution,namely:the Visible Infrared Imaging Radiometer Suite(VIIRS)(750 m/Multispectral),the Ocean and Land Color Instrument(OLCI)(300 m/Multispectral),the Hyperspectral Imager for the Coastal Ocean(HICO)(100 m/Hyperspectral),and the Landsat 8 Operational Land Imager(OLI)(30 m/Multispectral).The UV to visible scheme can benefit the CDOM absorption estimation in two aspects:1)it is free from the disturbance of suspended matter;2)it avoids uncertainties caused by the low signalto-noise ratio(SNR)of ag measurements in the visible range.The algorithm is effective in revealing multiple scales of variation of CDOM absorption from ocean color observations.

关键词： Chromophoric dissolved organic matter ocean color remote sensing Pearl River Estuary ultraviolet

Remote sensing study of wetlands in the Pearl River Delta during 1995-2015 with the support vector machine method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2018年第3期12卷 521-531页

作者： Xiaosong HAN jiayi pan Adam T. DEVLIN Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong China

In recent years, experienced rapid economic the Pearl River Delta has growth which may create a substantial burden to its ecology. In this study, the wetlands of the Pearl River Delta are investigated. Through the use of remote sensing methods, we analyze spatial and temporal variations of wetlands in this area over the past twenty years. The support vector machine （SVM） method is proven to be an effective approach for classifying the wetlands of the Pearl River Delta, and the total classifica- tion resolution reaches 94.94% with a Kappa coefficient exceeding 0.94, higher than other comparable analysis methods. Our results show that wetland areas were reduced by 36.9% during the past twenty years. The change detection analysis method shows that there was a 95.58% intertidal zone change to other land-use types, most of which （57.12%） was converted to construction land. In addition, farmland was reduced by 54.89% during the past twenty years, 47.19% of which was changed to construction land use. The inland water area increased 19.02%, but most of this growth （18.77%） was converted from the intertidal zone.

关键词： wetland Pearl River Delta support vector machine method Landsat images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

百香果YUCCA基因家族鉴定与表达分析

福建农业学报 2024年第2期39卷 165-174页

作者：潘佳怡潘若云江文洁任锐方庭福建农林大学园艺学院/福建农林大学园艺植物遗传育种研究所福建福州350002

【目的】黄素单加氧酶(YUCCA)基因是吲哚-3-乙酸(Indole-3-acetic acid,IAA)生物合成的主要限速酶基因之一,在植物生长发育中起着重要调控作用。本研究利用生物信息学方法对百香果(Passiflora edulis Sims.)YUCCA基因家族成员进行鉴定,... 详细信息

【目的】黄素单加氧酶(YUCCA)基因是吲哚-3-乙酸(Indole-3-acetic acid,IAA)生物合成的主要限速酶基因之一,在植物生长发育中起着重要调控作用。本研究利用生物信息学方法对百香果(Passiflora edulis Sims.)YUCCA基因家族成员进行鉴定,以期揭示百香果YUCCA家族基因在激素响应中的功能,同时为YUCCA家族基因在其他物种中的生物信息学研究提供参考。【方法】利用生物信息学方法分析百香果YUCCA基因编码蛋白质的理化性质和保守结构域,基因的染色体定位、基因结构、系统进化树、顺式作用元件等;利用qRT-PCR探究部分成员在植物生长调节剂IAA处理下的表达情况。【结果】百香果基因组中共鉴定出29个YUCCA家族成员,不均匀分布于8条染色体,基因长度(552~9210 bp)存在明显差异,含有1~8个内含子,同时具有8个保守基序。通过系统进化树分析,发现百香果YUCCA基因家族可划分为3类,聚在同一分类中的百香果YUCCA基因具有高度的保守性,同时发现百香果的YUCCA基因与苜蓿(Medicago sativa L.)、拟南芥(Arabidopsis thaliana)亲缘关系更近,而与水稻(Oryza sativa L.)的亲缘关系较远。顺式作用元件分析显示,百香果YUCCA基因家族启动子受多种激素所诱导,可响应多种逆境胁迫。转录组数据分析结果表明:PeYUCCA6、PeYUCCA11和PeYUCCA16在台农百香果和黄金百香果叶片中呈现较低表达或者不表达,其中PeYUCCA23在台农百香果和黄金百香果的表达量最高,推测该基因对百香果叶片的发育有较大影响。qRT-PCR分析结果表明,在100μmol·L-1 IAA处理后,PeYUCCA7、PeYUCCA13、PeYUCCA17、PeYUCCA24和PeYUCCA26基因表达量显著升高。【结论】YUCCA基因家族成员在IAA处理下的表达差异较大,YUCCA基因可能在植物生长调节剂IAA处理下的百香果生长发育和抵御逆境环境过程中发挥重要作用。

关键词：百香果吲哚-3-乙酸 YUCCA基因家族生物信息学定量分析

在线全文

学校读者我要写书评

暂无评论

董事会非正式层级与企业绿色创新

珞珈管理评论 2024年第1期52卷 119-150页

作者：林朝南泮佳怡厦门大学管理学院厦门361000

党的二十大报告指出,要站在人与自然和谐共生的高度谋划发展。绿色创新是解决目前环境问题与经济发展之间矛盾的有效手段。在中国关系本位社会的文化和制度背景下,董事会非正式层级能否在企业绿色创新实践中发挥治理作用是值得关注的重... 详细信息

党的二十大报告指出,要站在人与自然和谐共生的高度谋划发展。绿色创新是解决目前环境问题与经济发展之间矛盾的有效手段。在中国关系本位社会的文化和制度背景下,董事会非正式层级能否在企业绿色创新实践中发挥治理作用是值得关注的重要问题。本文以我国2010—2020年沪深A股上市公司为样本,研究发现董事会非正式层级越清晰,企业的绿色创新水平越高,包括绿色创新数量与质量双重维度的提升。机制检验表明,管理者自利行为在两者之间发挥中介作用。进一步分析结果显示,在企业内部控制较好、媒体关注度较高、融资约束程度较低以及政府环保补助较多的情境下,董事会非正式层级对绿色创新的促进效应更为明显。本文从微观运作层面为理解董事会治理和绿色创新提供一种新的视角和结论,对于优化董事会治理和提高企业绿色创新水平具有重要借鉴意义。

关键词：董事会治理非正式层级绿色创新

Remote sensing observations of phytoplankton increases triggered by successive typhoons

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2017年第4期11卷 601-608页

作者： Lei HUANG Hui ZHAO jiayi pan Adam DEVLIN College of Ocean and Meteorology Guangdong Ocean University Zhanjiang 524088 China Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong China Shenzhen Research Institute The Chinese University of Hong Kong Shenzhen 518057 China College of Marine Science Nanjing University of Information Science and Technology Nanjing 210044 China Department of Civil and Environmental Engineering Portland State University Portland OR 97207 USA

Phytoplankton blooms in the Western North Pacific, triggered by two successive typhoons with different intensities and translation speeds under different pre-existing oceanic conditions, were observed and analyzed using remotely sensed chlorophyll-a （Chl-a）, sea surface temperature （SST）, and sea surface height anomaly （SSHA） data, as well as typhoon parameters and CTD （conductivity, temperature, and depth） profiles. Typhoon Sinlaku, with relatively weaker intensity and slower translation speed, induced a stronger phytoplankton bloom than Jangrni with stronger intensity and faster translation speed （Chl-a〉0.18 mg-m-3 versus Chl- a〈 0.15 mg.m-3） east of Taiwan Island. Translation speed may be one of the important mechanisms that affect phytoplankton blooms in the study area. Pre-existing cyclonic circulations provided a relatively unstable thermodynamic structure for Sinlaku, and therefore cold water with rich nutrients could be brought up easily. The mixed-layer deepening caused by Typhoon Sinlaku, which occurred first, could have triggered an unfavorable condition for the phytoplankton bloom induced by Typhoon Jangmi which followed afterwards. The sea surface temperature cooling by Jangmi was suppressed due to the presence of the thick upper-ocean mixed-layer, which prevented the deeper cold water from being entrained into the upper-ocean mixed layer, leading to a weaker phytoplankton augment. The present study sug- gests that both wind （including typhoon translation speed and intensity） and pre-existing conditions （e.g., mixed- layer depths, eddies, and nutrients） play important roles in the strong phytoplankton bloom, and are responsible for the stronger phytoplankton bloom after Sinlaku＇s passage than that after Jangmi＇s passage. A new typhoon- influencing parameter is introduced that combines the effects of the typhoon forcing （including the typhoon intensity and translation speed） and the oceanic pre- condition. This parameter shows that the forcing effect of Sinlaku was stronger than that of Jangmi.

关键词： typhoon mixed-layer depth phytoplanktonbloom Northwest Pacific Ocean upwelling

抗生素对抗肿瘤免疫检查点抑制剂治疗效果影响的研究进展

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

医学综述 2024年第3期30卷 367-372页

作者：潘佳怡马维娜上海健康医学院上海201318 上海市嘉定区中心医院药剂科上海201800

抗生素是能抑制或杀灭某些病原体的化学物质,在临床上常用于治疗某些微生物所致的感染。免疫检查点抑制剂(ICIs)通过改善肿瘤周围免疫微环境激活体内免疫细胞活性,从而增强机体的抗肿瘤免疫反应,其长效抗肿瘤效应使得这一新的抗肿瘤方... 详细信息

抗生素是能抑制或杀灭某些病原体的化学物质,在临床上常用于治疗某些微生物所致的感染。免疫检查点抑制剂(ICIs)通过改善肿瘤周围免疫微环境激活体内免疫细胞活性,从而增强机体的抗肿瘤免疫反应,其长效抗肿瘤效应使得这一新的抗肿瘤方法备受关注。肿瘤患者可能因为感染而存在同时使用抗生素和ICIs的情况,故研究抗生素对ICIs疗效的影响,对肿瘤患者能否安全、有效地接受治疗并提高其生存率具有重要意义。未来可深入探索抗生素对ICIs治疗效果的影响,促进合理用药,以为临床提供参考。

关键词：抗生素抗肿瘤免疫检查点抑制剂肠道菌群