Forest fragmentation is an integral part of global change.Understanding forest fragmentation patterns and dynamics are of great significance for maintaining ecosystem stability.There are great differences in the inter...Forest fragmentation is an integral part of global change.Understanding forest fragmentation patterns and dynamics are of great significance for maintaining ecosystem stability.There are great differences in the interference of natural and human factors on forests in different towns of mountainous cities,and the characteristics of forest fragmentation are also obviously different.Forest fragmentation has been broadly studied,yet,it remains poorly understood at the township-scale within mountainous cities.In this study,the spatial form of forest landscape and forest fragmentation modes of towns were examined in Qujing City,Yunnan Province,China for the years of 2006 and 2016,relying heavily on the morphological spatial pattern analysis(MSPA)and K-means clustering algorithm.Results in 2016 showed that the forest landscape morphology of Qujing could be divided into seven classes:core,perforation,islet,bridge,edge,branch and ring;with landscape areas of 41.94%,1.22%,7.04%,11.12%,23.26%,11.74%and 3.68%respectively.Compared with 2006,the changes of landscape area were 1.71%,0.02%,0.30%,1.65%,0.20%,0.19%and 0.05%respectively.The townships in Qujing varied significantly in their landscape fragmentation patterns,and these patterns were spatially dependent.Different forest landscape forms have positive spatial correlations and differences.The forest fragmentation modes of towns can be divided into four types:Low anthropogenic towns,high anthropogenic towns,complex terrain towns and gentle terrain towns.Different ways of human activities play a decisive role in forest landscape fragmentation.The expansion of construction land and agricultural land intensifies forest fragmentation;however,man-made orderly and planned ecological restoration will greatly improve the forest coverage and improve the spatial form of urban forest landscape.展开更多
Land use/cover change(LUCC)constitutes the spatial and temporal patterns of ecological security,and the construction of ecological networks is an effective way to ensure ecological security.Exploring the spatial and t...Land use/cover change(LUCC)constitutes the spatial and temporal patterns of ecological security,and the construction of ecological networks is an effective way to ensure ecological security.Exploring the spatial and temporal change characteristics of ecological network and analyzing the integrated relationship between LUCC and ecological security are crucial for ensuring regional ecological security.Gansu is one of the provinces with fragile ecological environment in China,and rapid changes in land use patterns in recent decades have threatened ecological security.Therefore,taking Gansu Province as the study area,this study simulated its land use pattern in 2050 using patch-generating land use simulation(PLUS)model based on the LUCC trend from 2000 to 2020 and integrated the LUCC into morphological spatial pattern analysis(MSPA)to identify ecological sources and extract the ecological corridors to construct ecological network using circuit theory.The results revealed that,according to the prediction results in 2050,the areas of cultivated land,forest land,grassland,water body,construction land,and unused land would be 63,447.52,39,510.80,148,115.18,4605.21,8368.89,and 161,752.40 km^(2),respectively.The number of ecological sources in Gansu Province would increase to 80,with a total area of 99,927.18 km^(2).The number of ecological corridors would increase to 191,with an estimated total length of 6120.66 km.Both ecological sources and ecological corridors showed a sparse distribution in the northwest and dense distribution in the southeast of the province at the spatial scale.The number of ecological pinch points would reach 312 and the total area would expect to increase to 842.84 km^(2),with the most pronounced increase in the Longdong region.Compared with 2020,the number and area of ecological barriers in 2050 would decrease significantly by 63 and 370.71 km^(2),respectively.In general,based on the prediction results,the connectivity of ecological network of Gansu Province would increase in 2050.To achieve the predicted ecological network in 2050,emphasis should be placed on the protection of cultivated land and ecological land,the establishment of ecological sources in desert areas,the reinforcement of the protection for existing ecological sources,and the construction of ecological corridors to enhance the stability of ecological network.This study provides valuable theoretical support and references for the future construction of ecological networks and regional land resource management decision-making.展开更多
Territorial spatial ecological restoration is a crucial prerequisite for optimizing the territorial spatial patterns,enhancing the ecosystem functions,and achieving sustainable development at the regional scale.The Qa...Territorial spatial ecological restoration is a crucial prerequisite for optimizing the territorial spatial patterns,enhancing the ecosystem functions,and achieving sustainable development at the regional scale.The Qaidam Basin,located in the alpine arid region of the Qinghai–Xizang Plateau,China,is experiencing desertification,biodiversity loss,soil erosion,and environmental pollution.Selecting the Qaidam Basin as the study area,we identified 9 ecological sources in the region using the Morphological Spatial Pattern Analysis(MSPA)method and the landscape connectivity assessment,and extracted 10 significant corridors and 26 general corridors using the Minimum Cumulative Resistance(MCR)and Gravity models.Then,we determined 114 ecological"pinch points"and 42 ecological barrier points by employing the Circuit Theory,thereby constructing the ecological security pattern of the area.Further,we evaluated the ecosystem health of the Qaidam Basin during 2003–2023 using the Vitality–Organization–Resilience–Service(VORS)model.Finally,we integrated ecosystem health assessment and ecological security pattern to comprehensively identify the key areas for ecological restoration in the Qaidam Basin.The results revealed that the ecosystem in the basin fluctuated toward a healthier state from 2003 to 2023.The average ecosystem health index(EHI)for the basin decreased from 0.34 in 2003 to 0.28 in 2013,followed by a substantial recovery to 0.36 in 2023.Higher EHI values were found in the northeastern,southeastern,and southwestern fringes and lower values were located in the basin interior and northwestern region.During 2003–2023,the areas that exhibited a decrease in EHI were primarily located in the interior and northwestern regions of the basin,while those that exhibited an increase in EHI were located in the northeastern,southeastern,and southwestern fringes,demonstrating expanded spatial differences.This may be attributed to the fact that once an eco-environment is damaged,the ecological recovery of the vulnerable areas within the eco-environment will be slow and difficult.This study identified four types of ecological restoration areas,including corridor connectivity,artificial restoration,ecological recovery,and ecological enhancement zones,covering a total area of 6034.7 km2,and proposed targeted ecological restoration strategies according to these different categories.Our findings can serve as a valuable reference for optimizing the territorial spatial patterns,enhancing the ecosystem functions,and promoting sustainable development in the Qaidam Basin.展开更多
This paper is focused on the study of the urban form of Tomar, which was founded in Portugal by the Order of the Temple during the 12th century. It is centered on the site where the Order of the Temple was created, Je...This paper is focused on the study of the urban form of Tomar, which was founded in Portugal by the Order of the Temple during the 12th century. It is centered on the site where the Order of the Temple was created, Jerusalem, and also on the Templar European headquarters, Paris, in Marais neighborhood; as well as on its headquarters in Portugal, Tomar; and finally, on Angra which was set up in Azores at the beginning of the Portuguese discoveries in 1427. While exploring possible Templar principles on setting up medieval geometric cities, the aim of this paper is to expose that Tomar is a truly relevant case on that process and, therefore, that Portugal have had a significant role on medieval geometric urbanism. The achievements of this paper show that the selected territories share common settlement principles which are based on both similar geometric rules and analogous hierarchy schemes. Regarding that, it will be possible to state that cultural and population exchanges with France should not be considered as the sole factor to shape European medieval urbanity. Portugal should have had a role on that process, too. At least, it should be possible to explore other hypothesis on further pieces of research, according to the exposed arguments.展开更多
A pseudoplastic metal nanoparticle fluid （PMNF） is used in nanoimprint to fabricate semiconductors and func- tional devices. The evaporation of the solvent and the sintering of the Au PMNF are investigated. The key ...A pseudoplastic metal nanoparticle fluid （PMNF） is used in nanoimprint to fabricate semiconductors and func- tional devices. The evaporation of the solvent and the sintering of the Au PMNF are investigated. The key parameters, which influence the morphology of patterning, such as the radius of metal particles, the concentra- tion of metal particles, the Hamaker constant of the solvent, viscosity of the fluids and the evaporation velocity, are analyzed. Based on a two-sphere sintering model, the equations are derived, which represent the relationships between the relative shrinkage and radius of the metal particles, sintering temperature and time. The optimal parameters for the heat treatment are provided in nanoimprint.展开更多
Accurately assessing the value of ecosystem services and establishing an ecological security pattern to identify the future trends and characteristics of changes in the ecological security pattern and maintain regiona...Accurately assessing the value of ecosystem services and establishing an ecological security pattern to identify the future trends and characteristics of changes in the ecological security pattern and maintain regional ecological security is of great significance for promoting regional sustainability.Based on the calculation of the ecosystem service value in Hubei Province,the study identified the ecological source areas in combination with the types of landscape patterns.It selected the resistance factors that fit the characteristics of the study area in combination with previous studies to establish the ecological resistance surface.The McR model was used to extract the potential ecological corridors in the study area and identify the ecological nodes.Construct the ecological security pattern of Hubei Province from 1992 to 2022 and analyze its spatio-temporal dynamic change characteristics.The research results show that:(1)The value of ecosystem services in Hubei Province has generally shown a fluctuating upward trend from 1992 to 2022.Among the types of ecosystem services,the value of regulatory services accounts for the largest proportion.Among different land use types,the value of ecosystem services provided by forest land types is the highest.(2)A total of 10 ecological sources were extracted in the study.It is mainly distributed in Shennongjia Forestry District,Shiyan City and Enshi City,with a small portion found in the northeastern and southeastern parts of Hubei Province.(3)The 35 potential ecological corridors identified are mainly closed circular structures,presenting a distribution feature of"more in the east and less in the west".(4)Build an ecological security pattern with Jingmen City as the center,connecting Shiyan City,Shennongjia Forestry District,Xianyang City,Huanggang City and Suizhou City.The research put forward optimization suggestions in response to the specific problems existing in the ecological security pattern and the actual ecological conditions of Hubei Province.The research results can provide ideas and methods for the optimization of the ecological security pattern and the high-quality development of the ecosystem in Hubei Province,and at the same time offer reference value for the protection and optimization of ecosystems at other provincial levels.展开更多
Monitoring of potential bearing faults in operation is of critical importance to safe operation of high speed trains.One of the major challenges is how to differentiate relevant signals to operational conditions of be...Monitoring of potential bearing faults in operation is of critical importance to safe operation of high speed trains.One of the major challenges is how to differentiate relevant signals to operational conditions of bearings from noises emitted from the surrounding environment.In this work,we report a procedure for analyzing acoustic emission signals collected from rolling bearings for diagnosis of bearing health conditions by examining their morphological pattern spectrum（MPS） through a multi-scale morphology analysis procedure.The results show that acoustic emission signals resulted from a given type of bearing faults share rather similar MPS curves.Further examinations in terms of sample entropy and Lempel-Ziv complexity of MPS curves suggest that these two parameters can be utilized to determine damage modes.展开更多
Green Infrastructure(GI)has garnered increasing attention from various regions due to its potential to mitigate urban heat island(UHI),which has been exacerbated by global climate change.This study focuses on the cent...Green Infrastructure(GI)has garnered increasing attention from various regions due to its potential to mitigate urban heat island(UHI),which has been exacerbated by global climate change.This study focuses on the central area of Fuzhou city,one of the“furnace”cities,and aims to explore the correlation between the GI pattern and land surface temperature(LST)in the spring and autumn seasons.The research adopts a multiscale approach,starting from the urban scale and using urban geographic spatial characteristics,multispectral remote sensing data,and morphological spatial pattern analysis(MSPA).Significant MSPA elements were tested and combined with LST to conduct a geographic weighted regression(GWR)experiment.The findings reveal that the UHI in the central area of Fuzhou city has a spatial characteristic of“high temperature in the middle and low temperature around,”which is coupled with a“central scattered and peripheral concentrated”distribution of GI.This suggests that remote sensing data can effectively be utilised for UHI inversion.Additionally,the study finds that the complexity of GI,whether from the perspective of the overall GI pattern or the classification study based on the proportion of the core area,has an impact on the alleviation of UHI in both seasons.In conclusion,this study underscores the importance of a reasonable layout of urban green infrastructure for mitigating UHI.展开更多
The effect of material surface morphology on the periodic subwavelength of nano-structures induced by a femtosecond（fs） laser was investigated systematically from the initial surface roughness, the different scratch...The effect of material surface morphology on the periodic subwavelength of nano-structures induced by a femtosecond（fs） laser was investigated systematically from the initial surface roughness, the different scratches, the pre-formed ripples, and the ＂layer-carving＂ technology experiments. The results of the comparative experiments indicate that the initial surface conditions of the target surface have no obvious effects on the spatial structured periods（SSPs） and the ripple orientation of the periodic nano-structures induced by a fs laser, which agreed well with the foretold present surface two-plasmon resonance（STPR） model. Furthermore, different shapes of nanogrids with high regularity and uniformity were obtained by fs-laser fabrication.展开更多
The destruction of the ecological system caused by urban expansion has led to the environmental deterioration,cities have become increasingly vulnerable.In this study,six districts and counties along the Yellow River ...The destruction of the ecological system caused by urban expansion has led to the environmental deterioration,cities have become increasingly vulnerable.In this study,six districts and counties along the Yellow River in Zhengzhou were selected as the study area.First,green infrastructure elements were extracted by morphological spatial pattern analysis.Then,outside the urban areas,we used connectivity analysis to evaluate the importance of core areas,adopted minimum cumulative resistance model to extract potential corridors,and identified the important corridors by using the gravity model.Finally,in the urban areas,we set up an evaluation system to assess the demands for ecosystem services.The results showed that:(1)Seven landscape types of green infrastructure be identified in study area.(2)There are 17 vital cores,136 potential corridors,and 24 vital corridors outside the urban areas.(3)The blocks with high demand for ecosystem services are mostly concentrated in the old blocks with dense populations and poor infrastructure,and there are 5 blocks with comprehensive high-demand.Based on identified importance for green infrastructure land space,and high-demand level for ecosystem services areas in this study,a green infrastructure net plan was proposed based on spatial conservation prioritisation.展开更多
基金The research reported in this manuscript is funded by the Joint Special Project on Agricultural Basic Research of Yunnan Province,China[Grant No.18YJAZH032]Humanities and Social Sciences Research Program of the Ministry of Education of China[Grant No.2018FG001-065]National Natural Science Foundation of China[Grant No.31760212].
文摘Forest fragmentation is an integral part of global change.Understanding forest fragmentation patterns and dynamics are of great significance for maintaining ecosystem stability.There are great differences in the interference of natural and human factors on forests in different towns of mountainous cities,and the characteristics of forest fragmentation are also obviously different.Forest fragmentation has been broadly studied,yet,it remains poorly understood at the township-scale within mountainous cities.In this study,the spatial form of forest landscape and forest fragmentation modes of towns were examined in Qujing City,Yunnan Province,China for the years of 2006 and 2016,relying heavily on the morphological spatial pattern analysis(MSPA)and K-means clustering algorithm.Results in 2016 showed that the forest landscape morphology of Qujing could be divided into seven classes:core,perforation,islet,bridge,edge,branch and ring;with landscape areas of 41.94%,1.22%,7.04%,11.12%,23.26%,11.74%and 3.68%respectively.Compared with 2006,the changes of landscape area were 1.71%,0.02%,0.30%,1.65%,0.20%,0.19%and 0.05%respectively.The townships in Qujing varied significantly in their landscape fragmentation patterns,and these patterns were spatially dependent.Different forest landscape forms have positive spatial correlations and differences.The forest fragmentation modes of towns can be divided into four types:Low anthropogenic towns,high anthropogenic towns,complex terrain towns and gentle terrain towns.Different ways of human activities play a decisive role in forest landscape fragmentation.The expansion of construction land and agricultural land intensifies forest fragmentation;however,man-made orderly and planned ecological restoration will greatly improve the forest coverage and improve the spatial form of urban forest landscape.
基金supported by the Science Fund for the Gansu Provincial Natural Science Foundation Project(22JR5RA339).
文摘Land use/cover change(LUCC)constitutes the spatial and temporal patterns of ecological security,and the construction of ecological networks is an effective way to ensure ecological security.Exploring the spatial and temporal change characteristics of ecological network and analyzing the integrated relationship between LUCC and ecological security are crucial for ensuring regional ecological security.Gansu is one of the provinces with fragile ecological environment in China,and rapid changes in land use patterns in recent decades have threatened ecological security.Therefore,taking Gansu Province as the study area,this study simulated its land use pattern in 2050 using patch-generating land use simulation(PLUS)model based on the LUCC trend from 2000 to 2020 and integrated the LUCC into morphological spatial pattern analysis(MSPA)to identify ecological sources and extract the ecological corridors to construct ecological network using circuit theory.The results revealed that,according to the prediction results in 2050,the areas of cultivated land,forest land,grassland,water body,construction land,and unused land would be 63,447.52,39,510.80,148,115.18,4605.21,8368.89,and 161,752.40 km^(2),respectively.The number of ecological sources in Gansu Province would increase to 80,with a total area of 99,927.18 km^(2).The number of ecological corridors would increase to 191,with an estimated total length of 6120.66 km.Both ecological sources and ecological corridors showed a sparse distribution in the northwest and dense distribution in the southeast of the province at the spatial scale.The number of ecological pinch points would reach 312 and the total area would expect to increase to 842.84 km^(2),with the most pronounced increase in the Longdong region.Compared with 2020,the number and area of ecological barriers in 2050 would decrease significantly by 63 and 370.71 km^(2),respectively.In general,based on the prediction results,the connectivity of ecological network of Gansu Province would increase in 2050.To achieve the predicted ecological network in 2050,emphasis should be placed on the protection of cultivated land and ecological land,the establishment of ecological sources in desert areas,the reinforcement of the protection for existing ecological sources,and the construction of ecological corridors to enhance the stability of ecological network.This study provides valuable theoretical support and references for the future construction of ecological networks and regional land resource management decision-making.
基金supported by the National Natural Science Foundation of China(41961045)the Shanxi Province Basic Research Program(202103021223253).
文摘Territorial spatial ecological restoration is a crucial prerequisite for optimizing the territorial spatial patterns,enhancing the ecosystem functions,and achieving sustainable development at the regional scale.The Qaidam Basin,located in the alpine arid region of the Qinghai–Xizang Plateau,China,is experiencing desertification,biodiversity loss,soil erosion,and environmental pollution.Selecting the Qaidam Basin as the study area,we identified 9 ecological sources in the region using the Morphological Spatial Pattern Analysis(MSPA)method and the landscape connectivity assessment,and extracted 10 significant corridors and 26 general corridors using the Minimum Cumulative Resistance(MCR)and Gravity models.Then,we determined 114 ecological"pinch points"and 42 ecological barrier points by employing the Circuit Theory,thereby constructing the ecological security pattern of the area.Further,we evaluated the ecosystem health of the Qaidam Basin during 2003–2023 using the Vitality–Organization–Resilience–Service(VORS)model.Finally,we integrated ecosystem health assessment and ecological security pattern to comprehensively identify the key areas for ecological restoration in the Qaidam Basin.The results revealed that the ecosystem in the basin fluctuated toward a healthier state from 2003 to 2023.The average ecosystem health index(EHI)for the basin decreased from 0.34 in 2003 to 0.28 in 2013,followed by a substantial recovery to 0.36 in 2023.Higher EHI values were found in the northeastern,southeastern,and southwestern fringes and lower values were located in the basin interior and northwestern region.During 2003–2023,the areas that exhibited a decrease in EHI were primarily located in the interior and northwestern regions of the basin,while those that exhibited an increase in EHI were located in the northeastern,southeastern,and southwestern fringes,demonstrating expanded spatial differences.This may be attributed to the fact that once an eco-environment is damaged,the ecological recovery of the vulnerable areas within the eco-environment will be slow and difficult.This study identified four types of ecological restoration areas,including corridor connectivity,artificial restoration,ecological recovery,and ecological enhancement zones,covering a total area of 6034.7 km2,and proposed targeted ecological restoration strategies according to these different categories.Our findings can serve as a valuable reference for optimizing the territorial spatial patterns,enhancing the ecosystem functions,and promoting sustainable development in the Qaidam Basin.
文摘This paper is focused on the study of the urban form of Tomar, which was founded in Portugal by the Order of the Temple during the 12th century. It is centered on the site where the Order of the Temple was created, Jerusalem, and also on the Templar European headquarters, Paris, in Marais neighborhood; as well as on its headquarters in Portugal, Tomar; and finally, on Angra which was set up in Azores at the beginning of the Portuguese discoveries in 1427. While exploring possible Templar principles on setting up medieval geometric cities, the aim of this paper is to expose that Tomar is a truly relevant case on that process and, therefore, that Portugal have had a significant role on medieval geometric urbanism. The achievements of this paper show that the selected territories share common settlement principles which are based on both similar geometric rules and analogous hierarchy schemes. Regarding that, it will be possible to state that cultural and population exchanges with France should not be considered as the sole factor to shape European medieval urbanity. Portugal should have had a role on that process, too. At least, it should be possible to explore other hypothesis on further pieces of research, according to the exposed arguments.
基金Supported by the National Natural Science Foundation of China under Grant Nos 51175479 and 51475436the Education Department of Henan Province under Grant Nos 13A460725 and 2013GGJS-001
文摘A pseudoplastic metal nanoparticle fluid （PMNF） is used in nanoimprint to fabricate semiconductors and func- tional devices. The evaporation of the solvent and the sintering of the Au PMNF are investigated. The key parameters, which influence the morphology of patterning, such as the radius of metal particles, the concentra- tion of metal particles, the Hamaker constant of the solvent, viscosity of the fluids and the evaporation velocity, are analyzed. Based on a two-sphere sintering model, the equations are derived, which represent the relationships between the relative shrinkage and radius of the metal particles, sintering temperature and time. The optimal parameters for the heat treatment are provided in nanoimprint.
基金The National Natural Science Foundation of China(41671518)。
文摘Accurately assessing the value of ecosystem services and establishing an ecological security pattern to identify the future trends and characteristics of changes in the ecological security pattern and maintain regional ecological security is of great significance for promoting regional sustainability.Based on the calculation of the ecosystem service value in Hubei Province,the study identified the ecological source areas in combination with the types of landscape patterns.It selected the resistance factors that fit the characteristics of the study area in combination with previous studies to establish the ecological resistance surface.The McR model was used to extract the potential ecological corridors in the study area and identify the ecological nodes.Construct the ecological security pattern of Hubei Province from 1992 to 2022 and analyze its spatio-temporal dynamic change characteristics.The research results show that:(1)The value of ecosystem services in Hubei Province has generally shown a fluctuating upward trend from 1992 to 2022.Among the types of ecosystem services,the value of regulatory services accounts for the largest proportion.Among different land use types,the value of ecosystem services provided by forest land types is the highest.(2)A total of 10 ecological sources were extracted in the study.It is mainly distributed in Shennongjia Forestry District,Shiyan City and Enshi City,with a small portion found in the northeastern and southeastern parts of Hubei Province.(3)The 35 potential ecological corridors identified are mainly closed circular structures,presenting a distribution feature of"more in the east and less in the west".(4)Build an ecological security pattern with Jingmen City as the center,connecting Shiyan City,Shennongjia Forestry District,Xianyang City,Huanggang City and Suizhou City.The research put forward optimization suggestions in response to the specific problems existing in the ecological security pattern and the actual ecological conditions of Hubei Province.The research results can provide ideas and methods for the optimization of the ecological security pattern and the high-quality development of the ecosystem in Hubei Province,and at the same time offer reference value for the protection and optimization of ecosystems at other provincial levels.
基金supported by the National Natural Science Foundation of China (Grant 51205017)the National Science and Technology Support Program (Grant 2015BAG12B01)the National Basic Research Program of China (Grant 2015CB654805)
文摘Monitoring of potential bearing faults in operation is of critical importance to safe operation of high speed trains.One of the major challenges is how to differentiate relevant signals to operational conditions of bearings from noises emitted from the surrounding environment.In this work,we report a procedure for analyzing acoustic emission signals collected from rolling bearings for diagnosis of bearing health conditions by examining their morphological pattern spectrum（MPS） through a multi-scale morphology analysis procedure.The results show that acoustic emission signals resulted from a given type of bearing faults share rather similar MPS curves.Further examinations in terms of sample entropy and Lempel-Ziv complexity of MPS curves suggest that these two parameters can be utilized to determine damage modes.
文摘Green Infrastructure(GI)has garnered increasing attention from various regions due to its potential to mitigate urban heat island(UHI),which has been exacerbated by global climate change.This study focuses on the central area of Fuzhou city,one of the“furnace”cities,and aims to explore the correlation between the GI pattern and land surface temperature(LST)in the spring and autumn seasons.The research adopts a multiscale approach,starting from the urban scale and using urban geographic spatial characteristics,multispectral remote sensing data,and morphological spatial pattern analysis(MSPA).Significant MSPA elements were tested and combined with LST to conduct a geographic weighted regression(GWR)experiment.The findings reveal that the UHI in the central area of Fuzhou city has a spatial characteristic of“high temperature in the middle and low temperature around,”which is coupled with a“central scattered and peripheral concentrated”distribution of GI.This suggests that remote sensing data can effectively be utilised for UHI inversion.Additionally,the study finds that the complexity of GI,whether from the perspective of the overall GI pattern or the classification study based on the proportion of the core area,has an impact on the alleviation of UHI in both seasons.In conclusion,this study underscores the importance of a reasonable layout of urban green infrastructure for mitigating UHI.
基金supported by the National Natural Science Foundation of China(No.51705009)
文摘The effect of material surface morphology on the periodic subwavelength of nano-structures induced by a femtosecond（fs） laser was investigated systematically from the initial surface roughness, the different scratches, the pre-formed ripples, and the ＂layer-carving＂ technology experiments. The results of the comparative experiments indicate that the initial surface conditions of the target surface have no obvious effects on the spatial structured periods（SSPs） and the ripple orientation of the periodic nano-structures induced by a fs laser, which agreed well with the foretold present surface two-plasmon resonance（STPR） model. Furthermore, different shapes of nanogrids with high regularity and uniformity were obtained by fs-laser fabrication.
基金This work was supported by the National Natural Science Foundation of China[31600579]Henan Provincial Science and Technology Research Project[202102110234]Key Research Projects of Higher Education Institutions in Henan Province,China[21A220003].
文摘The destruction of the ecological system caused by urban expansion has led to the environmental deterioration,cities have become increasingly vulnerable.In this study,six districts and counties along the Yellow River in Zhengzhou were selected as the study area.First,green infrastructure elements were extracted by morphological spatial pattern analysis.Then,outside the urban areas,we used connectivity analysis to evaluate the importance of core areas,adopted minimum cumulative resistance model to extract potential corridors,and identified the important corridors by using the gravity model.Finally,in the urban areas,we set up an evaluation system to assess the demands for ecosystem services.The results showed that:(1)Seven landscape types of green infrastructure be identified in study area.(2)There are 17 vital cores,136 potential corridors,and 24 vital corridors outside the urban areas.(3)The blocks with high demand for ecosystem services are mostly concentrated in the old blocks with dense populations and poor infrastructure,and there are 5 blocks with comprehensive high-demand.Based on identified importance for green infrastructure land space,and high-demand level for ecosystem services areas in this study,a green infrastructure net plan was proposed based on spatial conservation prioritisation.
