Debate has persisted over whether the metamorphic basement of the Zhoushan Islands,easternmost Cathaysia Block,is Precambrian.Here,representative metamorphic rocks from the Qushan Islands were investigated using petro...Debate has persisted over whether the metamorphic basement of the Zhoushan Islands,easternmost Cathaysia Block,is Precambrian.Here,representative metamorphic rocks from the Qushan Islands were investigated using petrography,mineral chemistry,phase equilibria modeling and SHRIMP zircon U-Pb dating to constrain their metamorphic evolution and tectonic significance.Both the pelitic granulites(garnet-kyanite-perthite-biotite-quartz)and the mafic granulites(garnet-clinopyroxene-amphibole-plagioclase-quartz)reached high-pressure granulite-facies conditions of 1.2-1.4 GPa/820-900℃,and recorded three metamorphic stages along a clockwise P-T path with post-peak isothermal decompression.This trajectory indicated rapid exhumation of thickened continental crust during collisional orogeny.Metamorphic ages of 254±3 Ma,262±4 Ma and 259±3 Ma were obtained for mafic granulite,pelitic granulite and marble,respectively,and were consistent with the emplacement age of 259±4 Ma for a pegmatite vein.Detrital zircons in metasediments spanned 2706-330 Ma,which constrained the latest deposition to~330 Ma;thus represented mid-Paleozoic sediment metamorphosed during the late Paleozoic rather than Precambrian basement.We conclude that the Indosinian tectonothermal event in the Cathaysia Block had originated from late Paleozoic-early Mesozoic collisional orogeny between the South China Plate to the north and the Indochina Block to the south.展开更多
Seasonal cycles are essential components of weather and climatic systems. This study utilized observational data from a meteorological station on an island in the South China Sea from 1961 to 2020, along with ERA5 rea...Seasonal cycles are essential components of weather and climatic systems. This study utilized observational data from a meteorological station on an island in the South China Sea from 1961 to 2020, along with ERA5 reanalysis data, to explore the variations in seasonal cycles and thermal comfort characteristics on the island. The observational data revealed that the onset of summer on the island occurred earlier each year, whereas the onset of autumn was gradually delayed,leading to an increase in the duration of summer. Urbanization had played an important role in elevating local temperatures and extending the duration of summer. The thermal comfort index exhibited a clear upward trend annually, reflecting a shift towards warmer and less comfortable conditions due to urbanization. From 1961 to 2020, the annual average thermal comfort index indicated that 36 years(60%) were characterized by hot discomfort, and 24 years(40%) were within the comfortable range. The number of comfortable days per year on the island exhibited a declining trend. Urbanization markedly influenced the thermal comfort levels on the island, contributing to an annual increase in the number of hot discomfort days. However, the reanalysis data did not reflect the actual observed changes in the comfort characteristics on the island.展开更多
Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in a journey towards green energy transition.SIEMENS Energy,one of the world’s leading energy technology companies,became the fir...Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in a journey towards green energy transition.SIEMENS Energy,one of the world’s leading energy technology companies,became the first foreign-funded manufacturer to establish a branch and began construction of a gas turbine assembly base and service center in Hainan on December 18,2025.展开更多
Benthic habitat mapping is an emerging discipline in the international marine field in recent years,providing an effective tool for marine spatial planning,marine ecological management,and decision-making applications...Benthic habitat mapping is an emerging discipline in the international marine field in recent years,providing an effective tool for marine spatial planning,marine ecological management,and decision-making applications.Seabed sediment classification is one of the main contents of seabed habitat mapping.In response to the impact of remote sensing imaging quality and the limitations of acoustic measurement range,where a single data source does not fully reflect the substrate type,we proposed a high-precision seabed habitat sediment classification method that integrates data from multiple sources.Based on WorldView-2 multi-spectral remote sensing image data and multibeam bathymetry data,constructed a random forests(RF)classifier with optimal feature selection.A seabed sediment classification experiment integrating optical remote sensing and acoustic remote sensing data was carried out in the shallow water area of Wuzhizhou Island,Hainan,South China.Different seabed sediment types,such as sand,seagrass,and coral reefs were effectively identified,with an overall classification accuracy of 92%.Experimental results show that RF matrix optimized by fusing multi-source remote sensing data for feature selection were better than the classification results of simple combinations of data sources,which improved the accuracy of seabed sediment classification.Therefore,the method proposed in this paper can be effectively applied to high-precision seabed sediment classification and habitat mapping around islands and reefs.展开更多
THE Hainan Free Trade Port(FTP)officially launched island-wide special customs operations on December 18,2025.One month in,a reporting team from China International Communications Group(CICG)conducted an exclusive int...THE Hainan Free Trade Port(FTP)officially launched island-wide special customs operations on December 18,2025.One month in,a reporting team from China International Communications Group(CICG)conducted an exclusive interview with Feng Fei,secretary of the Hainan Provincial Committee of the Communist Party of China(CPC)and chairman of the Standing Committee of the Hainan Provincial People’s Congress.展开更多
By measuring scanning tunneling spectroscopy on some large Bi islands deposited on FeTe_(0.55)Se_(0.45)superconductors,we observe clear in-gap edge states with double peaks at about±1.0 me V on the spectra measur...By measuring scanning tunneling spectroscopy on some large Bi islands deposited on FeTe_(0.55)Se_(0.45)superconductors,we observe clear in-gap edge states with double peaks at about±1.0 me V on the spectra measured near the perimeter of the islands.This feature is very different from the single zero-energy peak observed on some other small Bi islands.The edge states spread towards the inner side of the islands over a width of 2-3 nm.The two edge-state peaks at positive and negative energies move to higher values with the increase of the magnetic field,and they disappear near the transition temperature of FeTe_(0.55)Se_(0.45).Meanwhile,enhanced superconducting gaps are observed in the central regions of these Bi islands,which may be induced by the enhanced pair potential of the topological surface state.Our observations provide a valuable message for the edge state and the proximity-induced superconductivity on specific Bi islands grown on FeTe_(0.55)Se_(0.45)substrate.展开更多
Managing invasive species requires identifying the factors that determine alien species invasion success.This study investigates how anthropogenic and biogeographical factors influence alien plant invasion in the Sany...Managing invasive species requires identifying the factors that determine alien species invasion success.This study investigates how anthropogenic and biogeographical factors influence alien plant invasion in the Sanyang Wetlands,a human-dominated island system in Wenzhou City,China.Specifically,we analyzed whether human activities(e.g.,habitat heterogeneity,proportion of road area,and cultivation)and island characteristics(e.g.,island area,isolation)affect the diversity of native and invasive plant species similarly.We also assessed the applicability of the equilibrium theory of island biogeography to invasive plant species diversity and examined how these factors affect invasive plant species with different dispersal syndromes(anemochore,zoochore,and autochore).We found that both invasive and native species richness positively correlate with island area,habitat heterogeneity,and proportion of road area.However,although native species richness was negatively correlated with isolation,invasive species richness was not.The diversity and composition of invasive species with different dispersal syndromes were determined by different variables;for example,the composition and diversity of zoochores was increased by habitat heterogeneity,while anemochore species richness was increased by the proportion of road area,whereas anemochore species composition was influenced by distance to the nearest island.We conclude that habitat fragmentation differentially affects invasive and native plant diversity,aligning with the predictions of the equilibrium theory of island biogeography only for native species but not for invasive species.Our findings indicate that tailoring habitat attributes and regulating human activities could be effective strategies for mitigating the spread of invasive species in fragmented landscapes.展开更多
Weizhou Island,located in Beihai,Guangxi Province,is recognized as the largest paleovolcanic island in China,characterized by its relatively young geological age.The development of island tourism has progressively est...Weizhou Island,located in Beihai,Guangxi Province,is recognized as the largest paleovolcanic island in China,characterized by its relatively young geological age.The development of island tourism has progressively established it as a significant tourist attraction within Beihai,transforming the area into a prominent leisure and tourism resort.As tourism on Weizhou Island continues to develop both in scope and in depth,it has increasingly influenced the sense of gain among the local community residents.Currently,in alignment with the strategic objective of achieving common prosperity,it is crucial to comprehend and enhance the sense of gain experienced by residents in island tourism destinations,as this is vital for the achievement of this overarching goal.Taking the residents of Weizhou Island in Beihai as the subjects,this paper constructs their sense of gain related to tourism,employing grounded theory.It posits that the residents’sense of gain comprises four primary dimensions:sense of economic gain,sense of social gain,sense of cultural gain,and sense of environmental gain.Additionally,the paper examines the factors that influence these dimensions.Based on this foundation,effective strategies are proposed to enhance the sense of gain among community residents in island tourism destinations,thereby promoting the sustainable development of island tourism.展开更多
Islands are valuable land resources in the ocean,and their detailed subsurface seismic velocity structures are highly important for underground space utilization,engineering construction,and geological disaster preven...Islands are valuable land resources in the ocean,and their detailed subsurface seismic velocity structures are highly important for underground space utilization,engineering construction,and geological disaster prevention.Ambient noise tomography and the horizontal–vertical spectral ratio(HVSR)method use ambient noise recordings instead of earthquake signals to study the underground velocity structure,making them easy to implement on islands and consequently becoming potential optimization schemes for the investigation of detailed island structures.However,the application of these technologies to small granite islands along coasts is relatively insufficient,and the applicability needs to be further verified.This study ambient noise tomography and HVSR analysis were carried out by using a dense array of seismic data on Wuzhizhou Island,Hainan.It was found that natural activities mainly cause the ambient noise below 8 Hz on Wuzhizhou Island.Moreover,high-quality noise cross-correlation functions of 3–8 Hz can be extracted.The results of ambient noise tomography and HVSR analysis show that the underground S-wave velocity structure and sedimentary characteristics of Wuzhizhou Island are coupled with its topography.The high-terrain area of Wuzhizhou Island exhibits low-velocity anomalies,where a sedimentary layer did not develop.On the other hand,the low-terrain area of Wuzhizhou Island exhibits high-velocity anomalies,where a thin Quaternary sedimentary layer developed.These results imply that subsurface magmatic activity controls the island topography and affects the distribution of the island sedimentary layer.This study successfully verifies the feasibility of detection methods based on ambient noise in small granite islands along the coast.It also provides key basic information for studying the geological evolutionary history,island spatial planning,and geological disaster prevention of Wuzhizhou Island.展开更多
The complex relationship between humans and nature plays a key role in shaping geographic landscapes.This study examines how tourism transforms island landscapes into marketable commodities,focusing on Guanglu Island ...The complex relationship between humans and nature plays a key role in shaping geographic landscapes.This study examines how tourism transforms island landscapes into marketable commodities,focusing on Guanglu Island in China from 2002–2025 through the lens of Actor-Network Theory(ANT).The findings reveal three main insights:1)commodification involves reimagining natural landscapes,digitizing them for broader appeal,and integrating them into tourist consumption.2)This process reshapes original landscapes into four interconnected forms:material landscapes,fluid landscapes,virtual landscapes,and psychological landscapes.3)Multiple actors drive commodification:the island’s natural conditions provide foundation and influence concrete ways of commodification,local government is deeply involved through planning and regulating tourism development,tourism practitioners adapt services to market demands,and tourist preferences guide the direction of commercialization.By analyzing the roles of both human and non-human actors,this research highlights how tourism redefines island landscapes while emphasizing the active influence of nature itself in these transformations.The findings reveal the geographical attributes of landscape commodification process and the multidimensionality and complexity of its impacts,thereby providing valuable insights for the sustainable development of island tourism.展开更多
The sedimentary geochemistry of St.Martin’s Island is important to determine the origin of the source rock,paleo weathering,tectonic setting,sediment recycling,maturity,sorting,redox condition,and paleo salinity of t...The sedimentary geochemistry of St.Martin’s Island is important to determine the origin of the source rock,paleo weathering,tectonic setting,sediment recycling,maturity,sorting,redox condition,and paleo salinity of the sediments.Major oxides,trace elements,and rare earth elements(REEs)obtained from the INAA technique are presented by analyzing the sediment samples collected from the shoreline of St.Martin’s Island,Bangladesh.The elemental ratios,comparison with average upper continental crust(UCC),binary diagrams(Th/Sc vs.Sc,La/Th vs.Hf,Th/Co vs.La/Sc),and chondrite normalized REE patterns exhibit substantial LREE enrichment,relatively fl at HREE fractionation,considerable negative Eu anomalies(average:0.72),indicates the derivation from a source dominated by felsic rock,with contribution from intermediate source and mafi c component.Sediments from St.Martin’s Island exhibit the deposition of sediments in transitional environments of active and passive continental margin settings.Weathering indices value of CIA,PIA,CIW,CIX,and K 2 O/Rb ratio show moderate chemical weathering,indicating that the sediments are chemically mature.Sedimentary redox indicative proxies,such as U/Th,V/Cr,and V/Sc,show an oxic depositional environment during sediment deposition.The intermediate CIA and other weathering index values of the St.Martin’s sediments show that the area had semiarid and humid climatic conditions throughout the deposition.The Rb/K ratio of the St.Martin’s sediments suggests that the development and deposition of the sedimentary sequence of St.Martin’s Island mainly occurred in a brackish water environment during the geological past.展开更多
Activity 1 Think about the following questions and write down your answers before reading the text.1.What are some possible ways animals can survive without access to fresh water sources?2.What other factors besides w...Activity 1 Think about the following questions and write down your answers before reading the text.1.What are some possible ways animals can survive without access to fresh water sources?2.What other factors besides water could contribute to the thriving(茁壮成长)of a herd of goats on an isolated island?展开更多
Background:Undernutrition poses a major threat for the growth and development of children in remote island regions of Bangladesh.Methods:This study investigated the prevalence and risk predictors of undernutrition amo...Background:Undernutrition poses a major threat for the growth and development of children in remote island regions of Bangladesh.Methods:This study investigated the prevalence and risk predictors of undernutrition among children under five in the island regions of Bangladesh.A cross‐sectional study was conducted in 13 unions across two islands,with a random sample of 549 children.Results:Descriptive analyses showed that underweight(Z‐score<−2),wasting(Z‐score<−2),and stunting(Z‐score<−2)were prevalent,with rates of 36.80%,24.60%,and 47.20%,respectively.Significant predictors of underweight included a history of diarrhea(AOR=2.24,p<0.001),acute respiratory infection(ARI)(AOR=1.84,p<0.01),anemic caregivers(AOR=1.52,p<0.05),and belonging to day labor families(AOR=0.29,p<0.01).Childhood wasting was significantly associated with partial vaccination(AOR=2.84,p<0.001),large family size(AOR=1.79,p<0.05),higher birth order(AOR=0.58,p<0.05),diarrhea(AOR=3.09,p<0.001),anemic mothers(AOR=1.89,p<0.05),primary(AOR=3.35,p<0.05)and secondary(AOR=4.11,p<0.01)maternal education,and fathers working abroad(AOR=0.42,p<0.05)or as daily laborers(AOR=0.17,p<0.001).Stunting was more common among children with partial vaccination,diarrhea,and ARI,and less common among those with a history of fever or those from day laborer families.Conclusion:Overall,undernutrition among children in the island areas of Bangladesh is influenced by multiple factors,necessitating a multisectoral approach to improve their nutritional status.展开更多
Hainan Island is one of the largest islands in China and is located in the Indo-Burma biodiversity hotspot region.Despite its ecological significance,comprehensive population genetic studies of key marine organisms al...Hainan Island is one of the largest islands in China and is located in the Indo-Burma biodiversity hotspot region.Despite its ecological significance,comprehensive population genetic studies of key marine organisms along the entire coastline of Hainan Island have not been reported.This study examined the genetic diversity and population structure of the widely distributed oyster Saccostrea malabonensis around Hainan Island with analyzing mitochondrial COI gene sequences.The impacts of geographical,environmental and anthropogenic factors on genetic differentiation were also investigated.The results revealed a significant AT bias in the COI gene sequences,with transitions as the main mutation type.A total of 103 variable sites and 107 haplotypes were identified from480 COI sequences,with haplotype diversities from 0.067 to 0.782,and nucleotide diversities between 0.00011 and 0.00278.AMOVA analysis indicated that 86.65%of the variation occurred within one population while 13.35%among different populations.The average genetic distance across 16 populations was 0.00169,and the average genetic differentiation index was 0.13353.Distinct population patterns can be observed.The populations of Tonghai Village(THV)and Gangmen Mountain(GMM)in Lingshui showed similar genetic structures while those of Wanquan River Estuary(WQRE,Qionghai)and Wuzhizhou Island(WZZI,Sanya)displayed divergent evolutionary trends.Cluster analysis grouped the 480 individuals of S.malabonensis into six subpopulations.These findings are helpful for developing conservation strategies and genetic breeding programs,and are also helpful for understanding the evolutionary history of this oyster species in Hainan Island.展开更多
The Diaoyu Island(Diaoyu Dao)and its affiliated islands(DAA)have abundant fishery resources,and chlorophyll a(Chl a)concentration is an important marine color element and an important indicator of primary productivity...The Diaoyu Island(Diaoyu Dao)and its affiliated islands(DAA)have abundant fishery resources,and chlorophyll a(Chl a)concentration is an important marine color element and an important indicator of primary productivity in the ocean.Therefore,it is meaningful to understand the distribution and variation characteristics of Chl a concentration in the waters near the DAA.The distribution details of Chl a concentration in the adjacent waters of DAA were revealed by high-resolution satellite GF-1 Wide Field View(WFV)data with 16 m spatial resolution.The results indicate that:(1)The Chl a concentration is between 0.06μg/L and 0.38μg/L throughout the year and the concentration of Chl a in the northeast and east directions of the island(downstream)is significantly higher than that in the west(upstream),and there are observed vortexes with high Chl a concentration in the downstream of DAA.This phenomenon continues to persist in the waters surrounding the DAA all year.(2)The vortex induced by the interaction between the current and island results in the vorticity change of water,inducing the replenishment of a large number of nutrients to the surface,thereby promoting the growth of plankton in the downstream of DAA on the east.In addition,the DAA also plays a significant role in regulating the downstream mix layer depth(MLD).The MLD in the northeast downstream is considerably deeper than the upstream in winter and spring;it is deeper in the east downstream in summer and autumn,and the range of influence for the MLD is greatly larger than the size of the island itself.This shows that the disruption of the DAA on the current is substantial.In addition,the combined effects of SST and wind also play a significant role in modifying Chl a distribution.(3)Based on the analysis above,this study proposes the conception of building fishing pastures downstream of the DAA,and proposes a general migration plan in different seasons to scientifically and rationally utilize and protect the surrounding waters of DAA.展开更多
Wars have been frequently commemorated in public space.In Spain,the Peninsular War has become key for memory policies almost since its beginning.More than 370 monuments from that period still stand today.Most of these...Wars have been frequently commemorated in public space.In Spain,the Peninsular War has become key for memory policies almost since its beginning.More than 370 monuments from that period still stand today.Most of these monuments recall heroic achievements by Spanish men or regiments,but some(more than twenty)provide reminders of the occupying troops coming from France.The most important of these is the obelisk built in Cabrera,in the Balearic archipelago,where many prisoners,who had been defeated in Bailén(1808),were taken.Many of those soldiers died and/or suffered several illnesses there,prompting the Prince of Joinville to commission a monument there in their memory.Although there Swiss,German,Polish and Italian soldiers were also present,only the French are engraved in the stone.Primary and secondary sources have been used to complete this research.Despite the difficult place of the monument and the limited number of recent studies,this paper studies and analyses the process that led to this memory antenna.展开更多
Rainbows-symbolizing peace,hope,promise and endurance(忍耐力)in hard times-are springing up in neighborhoods throughout Long Island in an effort to color the future road with optimism.The campaign,Rainbows over Nassau...Rainbows-symbolizing peace,hope,promise and endurance(忍耐力)in hard times-are springing up in neighborhoods throughout Long Island in an effort to color the future road with optimism.The campaign,Rainbows over Nassau and Suffolk Counties and Beyond,started on March 21 and spread through a group.It's a campaign that encourages participants to make rainbows to display outside their homes,anywhere from their front windows and doors to lawns and sidewalks.It follows another similar project,Chalk Your Walk,which promotes writing hopeful messages in chalk on driveways and sidewalks.展开更多
Last summer holiday,I went to Nan'ao Island in Shantou with my family.It was a wonderful trip,and I enjoyed it very much.The island is very beautiful.The sea was clear and blue,and the beach had soft golden sand.W...Last summer holiday,I went to Nan'ao Island in Shantou with my family.It was a wonderful trip,and I enjoyed it very much.The island is very beautiful.The sea was clear and blue,and the beach had soft golden sand.We spent the whole morning at Qing'ao Bay.I played frisbee with my brother,built a little sand house,and even collected some pretty seashells.The waves were small and gentle,so I ran into the water and felt very excited.Later,we visited the Nan'ao Island Museum,where we learned many interesting stories about the island's history,the fishermen's lives,and the animals in the sea.展开更多
The paper deals with the urgent problem of gas-geochemical parameters in the seas and shelf transit zones based on a comparison of field studies and remote sensing data.The results of complex gas-geochemical studies o...The paper deals with the urgent problem of gas-geochemical parameters in the seas and shelf transit zones based on a comparison of field studies and remote sensing data.The results of complex gas-geochemical studies of the Daginsky gas-hydrothermal system are presented,as well as an assessment of methane emissions from the studied area.The Daginsky gas-hydrothermal system is located on the northeastern coast of Sakhalin Island,and is a unique object due to a combination of a number of factors:from zonality due to the proximity of the Okhotsk Sea and the geological structure,to the interaction of deep and surface processes manifested in the presence of biogenic and thermogenic methane,as well as mantle helium.Tectonic faults and oil and gas bearing structures of the northeastern shelf of Sakhalin,which determine the direction of natural gas flows and facilitate its migration to the surface,make a significant contribution to the gas appearance of thermal springs.The main gas is methane up to 90%,homologues of methane up to and including pentane have been established,and isolated high concentrations of helium and hydrogen,both dissolved and in the free gas of bubbles,have also been noted.The conducted isotope studies allow to speak about the complex genesis of the gas.δ^(13)C isotopic composition,ranging from−49.4‰to−60.2‰shows the dominance of biogenic methane with an admixture of thermogenic component.This is also confirmed by the presence of a fraction of mantle helium.The flow of methane into the atmosphere from the Daginsky area is 963757.5 mol/(km^(2)·day),or about 15.4 t/(km^(2)·year),which indicates the importance of this region for the regional and global carbon cycle.The dynamics of methane emissions can vary depending on various factors,such as seasonal fluctuations and geological activity,which further complicates the understanding of processes in the region.展开更多
基金supported by the National Natural Science Foundation of China(42072223)Geological Survey project(DD20221649,DD20231429).
文摘Debate has persisted over whether the metamorphic basement of the Zhoushan Islands,easternmost Cathaysia Block,is Precambrian.Here,representative metamorphic rocks from the Qushan Islands were investigated using petrography,mineral chemistry,phase equilibria modeling and SHRIMP zircon U-Pb dating to constrain their metamorphic evolution and tectonic significance.Both the pelitic granulites(garnet-kyanite-perthite-biotite-quartz)and the mafic granulites(garnet-clinopyroxene-amphibole-plagioclase-quartz)reached high-pressure granulite-facies conditions of 1.2-1.4 GPa/820-900℃,and recorded three metamorphic stages along a clockwise P-T path with post-peak isothermal decompression.This trajectory indicated rapid exhumation of thickened continental crust during collisional orogeny.Metamorphic ages of 254±3 Ma,262±4 Ma and 259±3 Ma were obtained for mafic granulite,pelitic granulite and marble,respectively,and were consistent with the emplacement age of 259±4 Ma for a pegmatite vein.Detrital zircons in metasediments spanned 2706-330 Ma,which constrained the latest deposition to~330 Ma;thus represented mid-Paleozoic sediment metamorphosed during the late Paleozoic rather than Precambrian basement.We conclude that the Indosinian tectonothermal event in the Cathaysia Block had originated from late Paleozoic-early Mesozoic collisional orogeny between the South China Plate to the north and the Indochina Block to the south.
基金National Natural Science Foundation of China(U21A6001,42475077)Innovation Platform for Academicians of Hainan Province。
文摘Seasonal cycles are essential components of weather and climatic systems. This study utilized observational data from a meteorological station on an island in the South China Sea from 1961 to 2020, along with ERA5 reanalysis data, to explore the variations in seasonal cycles and thermal comfort characteristics on the island. The observational data revealed that the onset of summer on the island occurred earlier each year, whereas the onset of autumn was gradually delayed,leading to an increase in the duration of summer. Urbanization had played an important role in elevating local temperatures and extending the duration of summer. The thermal comfort index exhibited a clear upward trend annually, reflecting a shift towards warmer and less comfortable conditions due to urbanization. From 1961 to 2020, the annual average thermal comfort index indicated that 36 years(60%) were characterized by hot discomfort, and 24 years(40%) were within the comfortable range. The number of comfortable days per year on the island exhibited a declining trend. Urbanization markedly influenced the thermal comfort levels on the island, contributing to an annual increase in the number of hot discomfort days. However, the reanalysis data did not reflect the actual observed changes in the comfort characteristics on the island.
文摘Siemens and Yangpu Economic Development Zone in Hainan have forged a close partnership in a journey towards green energy transition.SIEMENS Energy,one of the world’s leading energy technology companies,became the first foreign-funded manufacturer to establish a branch and began construction of a gas turbine assembly base and service center in Hainan on December 18,2025.
基金Supported by the National Natural Science Foundation of China(Nos.42376185,41876111)the Shandong Provincial Natural Science Foundation(No.ZR2023MD073)。
文摘Benthic habitat mapping is an emerging discipline in the international marine field in recent years,providing an effective tool for marine spatial planning,marine ecological management,and decision-making applications.Seabed sediment classification is one of the main contents of seabed habitat mapping.In response to the impact of remote sensing imaging quality and the limitations of acoustic measurement range,where a single data source does not fully reflect the substrate type,we proposed a high-precision seabed habitat sediment classification method that integrates data from multiple sources.Based on WorldView-2 multi-spectral remote sensing image data and multibeam bathymetry data,constructed a random forests(RF)classifier with optimal feature selection.A seabed sediment classification experiment integrating optical remote sensing and acoustic remote sensing data was carried out in the shallow water area of Wuzhizhou Island,Hainan,South China.Different seabed sediment types,such as sand,seagrass,and coral reefs were effectively identified,with an overall classification accuracy of 92%.Experimental results show that RF matrix optimized by fusing multi-source remote sensing data for feature selection were better than the classification results of simple combinations of data sources,which improved the accuracy of seabed sediment classification.Therefore,the method proposed in this paper can be effectively applied to high-precision seabed sediment classification and habitat mapping around islands and reefs.
文摘THE Hainan Free Trade Port(FTP)officially launched island-wide special customs operations on December 18,2025.One month in,a reporting team from China International Communications Group(CICG)conducted an exclusive interview with Feng Fei,secretary of the Hainan Provincial Committee of the Communist Party of China(CPC)and chairman of the Standing Committee of the Hainan Provincial People’s Congress.
基金supported by the National Key R&D Program of China(Grant Nos.2022YFA1403201 and 2024YFA1408104)the National Natural Science Foundation of China(Grant Nos.11927809 and 12434004)the Natural Science Foundation of Jiangsu Province(Grant No.BK20233001)。
文摘By measuring scanning tunneling spectroscopy on some large Bi islands deposited on FeTe_(0.55)Se_(0.45)superconductors,we observe clear in-gap edge states with double peaks at about±1.0 me V on the spectra measured near the perimeter of the islands.This feature is very different from the single zero-energy peak observed on some other small Bi islands.The edge states spread towards the inner side of the islands over a width of 2-3 nm.The two edge-state peaks at positive and negative energies move to higher values with the increase of the magnetic field,and they disappear near the transition temperature of FeTe_(0.55)Se_(0.45).Meanwhile,enhanced superconducting gaps are observed in the central regions of these Bi islands,which may be induced by the enhanced pair potential of the topological surface state.Our observations provide a valuable message for the edge state and the proximity-induced superconductivity on specific Bi islands grown on FeTe_(0.55)Se_(0.45)substrate.
基金supported by the National Key R&D program(2023YFE0124900)the National Natural Science Foundation of China(32271606)the Research Project of Wenzhou Ecological Park Management Committee(SY2022ZD-1001-03).
文摘Managing invasive species requires identifying the factors that determine alien species invasion success.This study investigates how anthropogenic and biogeographical factors influence alien plant invasion in the Sanyang Wetlands,a human-dominated island system in Wenzhou City,China.Specifically,we analyzed whether human activities(e.g.,habitat heterogeneity,proportion of road area,and cultivation)and island characteristics(e.g.,island area,isolation)affect the diversity of native and invasive plant species similarly.We also assessed the applicability of the equilibrium theory of island biogeography to invasive plant species diversity and examined how these factors affect invasive plant species with different dispersal syndromes(anemochore,zoochore,and autochore).We found that both invasive and native species richness positively correlate with island area,habitat heterogeneity,and proportion of road area.However,although native species richness was negatively correlated with isolation,invasive species richness was not.The diversity and composition of invasive species with different dispersal syndromes were determined by different variables;for example,the composition and diversity of zoochores was increased by habitat heterogeneity,while anemochore species richness was increased by the proportion of road area,whereas anemochore species composition was influenced by distance to the nearest island.We conclude that habitat fragmentation differentially affects invasive and native plant diversity,aligning with the predictions of the equilibrium theory of island biogeography only for native species but not for invasive species.Our findings indicate that tailoring habitat attributes and regulating human activities could be effective strategies for mitigating the spread of invasive species in fragmented landscapes.
基金Sponsored by the Guangxi Philosophy and Social Sciences Research Annual Project(2024GLF036)Thousands of Young and Middle-aged Backbone Teachers Cultivation Program for Universities and Colleges in Guangxi(2021QGRW061).
文摘Weizhou Island,located in Beihai,Guangxi Province,is recognized as the largest paleovolcanic island in China,characterized by its relatively young geological age.The development of island tourism has progressively established it as a significant tourist attraction within Beihai,transforming the area into a prominent leisure and tourism resort.As tourism on Weizhou Island continues to develop both in scope and in depth,it has increasingly influenced the sense of gain among the local community residents.Currently,in alignment with the strategic objective of achieving common prosperity,it is crucial to comprehend and enhance the sense of gain experienced by residents in island tourism destinations,as this is vital for the achievement of this overarching goal.Taking the residents of Weizhou Island in Beihai as the subjects,this paper constructs their sense of gain related to tourism,employing grounded theory.It posits that the residents’sense of gain comprises four primary dimensions:sense of economic gain,sense of social gain,sense of cultural gain,and sense of environmental gain.Additionally,the paper examines the factors that influence these dimensions.Based on this foundation,effective strategies are proposed to enhance the sense of gain among community residents in island tourism destinations,thereby promoting the sustainable development of island tourism.
基金supported by the geological survey project(Grant No.DD20220992,Grant No.DD20242841,Grant No.DD20230592 and Grant No.DD20220993)Innovation Foundation of Science and Technology for“Nanhai New Star”Projects(Grant No.NHXXRCXM202353)of Hainan province。
文摘Islands are valuable land resources in the ocean,and their detailed subsurface seismic velocity structures are highly important for underground space utilization,engineering construction,and geological disaster prevention.Ambient noise tomography and the horizontal–vertical spectral ratio(HVSR)method use ambient noise recordings instead of earthquake signals to study the underground velocity structure,making them easy to implement on islands and consequently becoming potential optimization schemes for the investigation of detailed island structures.However,the application of these technologies to small granite islands along coasts is relatively insufficient,and the applicability needs to be further verified.This study ambient noise tomography and HVSR analysis were carried out by using a dense array of seismic data on Wuzhizhou Island,Hainan.It was found that natural activities mainly cause the ambient noise below 8 Hz on Wuzhizhou Island.Moreover,high-quality noise cross-correlation functions of 3–8 Hz can be extracted.The results of ambient noise tomography and HVSR analysis show that the underground S-wave velocity structure and sedimentary characteristics of Wuzhizhou Island are coupled with its topography.The high-terrain area of Wuzhizhou Island exhibits low-velocity anomalies,where a sedimentary layer did not develop.On the other hand,the low-terrain area of Wuzhizhou Island exhibits high-velocity anomalies,where a thin Quaternary sedimentary layer developed.These results imply that subsurface magmatic activity controls the island topography and affects the distribution of the island sedimentary layer.This study successfully verifies the feasibility of detection methods based on ambient noise in small granite islands along the coast.It also provides key basic information for studying the geological evolutionary history,island spatial planning,and geological disaster prevention of Wuzhizhou Island.
基金Under the auspices of National Natural Science Foundation of China(No.42471221)Major Projects of Key Research Base of Humanities and Social Sciences of Ministry of Education(No.22JJD790031)。
文摘The complex relationship between humans and nature plays a key role in shaping geographic landscapes.This study examines how tourism transforms island landscapes into marketable commodities,focusing on Guanglu Island in China from 2002–2025 through the lens of Actor-Network Theory(ANT).The findings reveal three main insights:1)commodification involves reimagining natural landscapes,digitizing them for broader appeal,and integrating them into tourist consumption.2)This process reshapes original landscapes into four interconnected forms:material landscapes,fluid landscapes,virtual landscapes,and psychological landscapes.3)Multiple actors drive commodification:the island’s natural conditions provide foundation and influence concrete ways of commodification,local government is deeply involved through planning and regulating tourism development,tourism practitioners adapt services to market demands,and tourist preferences guide the direction of commercialization.By analyzing the roles of both human and non-human actors,this research highlights how tourism redefines island landscapes while emphasizing the active influence of nature itself in these transformations.The findings reveal the geographical attributes of landscape commodification process and the multidimensionality and complexity of its impacts,thereby providing valuable insights for the sustainable development of island tourism.
基金Supporting Program for funding this work under Project number(RSP2024R328),King Saud University,Riyadh,Saudi Arabia.
文摘The sedimentary geochemistry of St.Martin’s Island is important to determine the origin of the source rock,paleo weathering,tectonic setting,sediment recycling,maturity,sorting,redox condition,and paleo salinity of the sediments.Major oxides,trace elements,and rare earth elements(REEs)obtained from the INAA technique are presented by analyzing the sediment samples collected from the shoreline of St.Martin’s Island,Bangladesh.The elemental ratios,comparison with average upper continental crust(UCC),binary diagrams(Th/Sc vs.Sc,La/Th vs.Hf,Th/Co vs.La/Sc),and chondrite normalized REE patterns exhibit substantial LREE enrichment,relatively fl at HREE fractionation,considerable negative Eu anomalies(average:0.72),indicates the derivation from a source dominated by felsic rock,with contribution from intermediate source and mafi c component.Sediments from St.Martin’s Island exhibit the deposition of sediments in transitional environments of active and passive continental margin settings.Weathering indices value of CIA,PIA,CIW,CIX,and K 2 O/Rb ratio show moderate chemical weathering,indicating that the sediments are chemically mature.Sedimentary redox indicative proxies,such as U/Th,V/Cr,and V/Sc,show an oxic depositional environment during sediment deposition.The intermediate CIA and other weathering index values of the St.Martin’s sediments show that the area had semiarid and humid climatic conditions throughout the deposition.The Rb/K ratio of the St.Martin’s sediments suggests that the development and deposition of the sedimentary sequence of St.Martin’s Island mainly occurred in a brackish water environment during the geological past.
文摘Activity 1 Think about the following questions and write down your answers before reading the text.1.What are some possible ways animals can survive without access to fresh water sources?2.What other factors besides water could contribute to the thriving(茁壮成长)of a herd of goats on an isolated island?
文摘Background:Undernutrition poses a major threat for the growth and development of children in remote island regions of Bangladesh.Methods:This study investigated the prevalence and risk predictors of undernutrition among children under five in the island regions of Bangladesh.A cross‐sectional study was conducted in 13 unions across two islands,with a random sample of 549 children.Results:Descriptive analyses showed that underweight(Z‐score<−2),wasting(Z‐score<−2),and stunting(Z‐score<−2)were prevalent,with rates of 36.80%,24.60%,and 47.20%,respectively.Significant predictors of underweight included a history of diarrhea(AOR=2.24,p<0.001),acute respiratory infection(ARI)(AOR=1.84,p<0.01),anemic caregivers(AOR=1.52,p<0.05),and belonging to day labor families(AOR=0.29,p<0.01).Childhood wasting was significantly associated with partial vaccination(AOR=2.84,p<0.001),large family size(AOR=1.79,p<0.05),higher birth order(AOR=0.58,p<0.05),diarrhea(AOR=3.09,p<0.001),anemic mothers(AOR=1.89,p<0.05),primary(AOR=3.35,p<0.05)and secondary(AOR=4.11,p<0.01)maternal education,and fathers working abroad(AOR=0.42,p<0.05)or as daily laborers(AOR=0.17,p<0.001).Stunting was more common among children with partial vaccination,diarrhea,and ARI,and less common among those with a history of fever or those from day laborer families.Conclusion:Overall,undernutrition among children in the island areas of Bangladesh is influenced by multiple factors,necessitating a multisectoral approach to improve their nutritional status.
基金the Hainan Provincial Natural Science Foundation of China(No.325RC675)the Starting Research Fund from the Hainan University(No.KYQD(ZR)-21004)。
文摘Hainan Island is one of the largest islands in China and is located in the Indo-Burma biodiversity hotspot region.Despite its ecological significance,comprehensive population genetic studies of key marine organisms along the entire coastline of Hainan Island have not been reported.This study examined the genetic diversity and population structure of the widely distributed oyster Saccostrea malabonensis around Hainan Island with analyzing mitochondrial COI gene sequences.The impacts of geographical,environmental and anthropogenic factors on genetic differentiation were also investigated.The results revealed a significant AT bias in the COI gene sequences,with transitions as the main mutation type.A total of 103 variable sites and 107 haplotypes were identified from480 COI sequences,with haplotype diversities from 0.067 to 0.782,and nucleotide diversities between 0.00011 and 0.00278.AMOVA analysis indicated that 86.65%of the variation occurred within one population while 13.35%among different populations.The average genetic distance across 16 populations was 0.00169,and the average genetic differentiation index was 0.13353.Distinct population patterns can be observed.The populations of Tonghai Village(THV)and Gangmen Mountain(GMM)in Lingshui showed similar genetic structures while those of Wanquan River Estuary(WQRE,Qionghai)and Wuzhizhou Island(WZZI,Sanya)displayed divergent evolutionary trends.Cluster analysis grouped the 480 individuals of S.malabonensis into six subpopulations.These findings are helpful for developing conservation strategies and genetic breeding programs,and are also helpful for understanding the evolutionary history of this oyster species in Hainan Island.
基金The Basic Public Welfare Research Program of Zhejiang Province under contract No.LGF21D010004the Key R&D Projects in Zhejiang Province under contract No.2023C03120.
文摘The Diaoyu Island(Diaoyu Dao)and its affiliated islands(DAA)have abundant fishery resources,and chlorophyll a(Chl a)concentration is an important marine color element and an important indicator of primary productivity in the ocean.Therefore,it is meaningful to understand the distribution and variation characteristics of Chl a concentration in the waters near the DAA.The distribution details of Chl a concentration in the adjacent waters of DAA were revealed by high-resolution satellite GF-1 Wide Field View(WFV)data with 16 m spatial resolution.The results indicate that:(1)The Chl a concentration is between 0.06μg/L and 0.38μg/L throughout the year and the concentration of Chl a in the northeast and east directions of the island(downstream)is significantly higher than that in the west(upstream),and there are observed vortexes with high Chl a concentration in the downstream of DAA.This phenomenon continues to persist in the waters surrounding the DAA all year.(2)The vortex induced by the interaction between the current and island results in the vorticity change of water,inducing the replenishment of a large number of nutrients to the surface,thereby promoting the growth of plankton in the downstream of DAA on the east.In addition,the DAA also plays a significant role in regulating the downstream mix layer depth(MLD).The MLD in the northeast downstream is considerably deeper than the upstream in winter and spring;it is deeper in the east downstream in summer and autumn,and the range of influence for the MLD is greatly larger than the size of the island itself.This shows that the disruption of the DAA on the current is substantial.In addition,the combined effects of SST and wind also play a significant role in modifying Chl a distribution.(3)Based on the analysis above,this study proposes the conception of building fishing pastures downstream of the DAA,and proposes a general migration plan in different seasons to scientifically and rationally utilize and protect the surrounding waters of DAA.
基金funded with the Research Project“La respetabilidad burguesa y sus dinámicas culturales,1830–1890”(PID2022-136358NB-I00),by Spanish Ministry of Science and Innovation.
文摘Wars have been frequently commemorated in public space.In Spain,the Peninsular War has become key for memory policies almost since its beginning.More than 370 monuments from that period still stand today.Most of these monuments recall heroic achievements by Spanish men or regiments,but some(more than twenty)provide reminders of the occupying troops coming from France.The most important of these is the obelisk built in Cabrera,in the Balearic archipelago,where many prisoners,who had been defeated in Bailén(1808),were taken.Many of those soldiers died and/or suffered several illnesses there,prompting the Prince of Joinville to commission a monument there in their memory.Although there Swiss,German,Polish and Italian soldiers were also present,only the French are engraved in the stone.Primary and secondary sources have been used to complete this research.Despite the difficult place of the monument and the limited number of recent studies,this paper studies and analyses the process that led to this memory antenna.
文摘Rainbows-symbolizing peace,hope,promise and endurance(忍耐力)in hard times-are springing up in neighborhoods throughout Long Island in an effort to color the future road with optimism.The campaign,Rainbows over Nassau and Suffolk Counties and Beyond,started on March 21 and spread through a group.It's a campaign that encourages participants to make rainbows to display outside their homes,anywhere from their front windows and doors to lawns and sidewalks.It follows another similar project,Chalk Your Walk,which promotes writing hopeful messages in chalk on driveways and sidewalks.
文摘Last summer holiday,I went to Nan'ao Island in Shantou with my family.It was a wonderful trip,and I enjoyed it very much.The island is very beautiful.The sea was clear and blue,and the beach had soft golden sand.We spent the whole morning at Qing'ao Bay.I played frisbee with my brother,built a little sand house,and even collected some pretty seashells.The waves were small and gentle,so I ran into the water and felt very excited.Later,we visited the Nan'ao Island Museum,where we learned many interesting stories about the island's history,the fishermen's lives,and the animals in the sea.
基金funded by a grant Russian Science Foundation(No.23-77-10038,https://rscf.ru/project/23-77-10038/)partly within the framework of the state task of the POI FEB RAS(No.124022100078-7).
文摘The paper deals with the urgent problem of gas-geochemical parameters in the seas and shelf transit zones based on a comparison of field studies and remote sensing data.The results of complex gas-geochemical studies of the Daginsky gas-hydrothermal system are presented,as well as an assessment of methane emissions from the studied area.The Daginsky gas-hydrothermal system is located on the northeastern coast of Sakhalin Island,and is a unique object due to a combination of a number of factors:from zonality due to the proximity of the Okhotsk Sea and the geological structure,to the interaction of deep and surface processes manifested in the presence of biogenic and thermogenic methane,as well as mantle helium.Tectonic faults and oil and gas bearing structures of the northeastern shelf of Sakhalin,which determine the direction of natural gas flows and facilitate its migration to the surface,make a significant contribution to the gas appearance of thermal springs.The main gas is methane up to 90%,homologues of methane up to and including pentane have been established,and isolated high concentrations of helium and hydrogen,both dissolved and in the free gas of bubbles,have also been noted.The conducted isotope studies allow to speak about the complex genesis of the gas.δ^(13)C isotopic composition,ranging from−49.4‰to−60.2‰shows the dominance of biogenic methane with an admixture of thermogenic component.This is also confirmed by the presence of a fraction of mantle helium.The flow of methane into the atmosphere from the Daginsky area is 963757.5 mol/(km^(2)·day),or about 15.4 t/(km^(2)·year),which indicates the importance of this region for the regional and global carbon cycle.The dynamics of methane emissions can vary depending on various factors,such as seasonal fluctuations and geological activity,which further complicates the understanding of processes in the region.
