In the Chinese lunar calendar,2026 ushers in the Year of the Horse,a creature that has carried humanity across continents and through centuries.More than a marker of time,the horse embodies vitality,courage,and the re...In the Chinese lunar calendar,2026 ushers in the Year of the Horse,a creature that has carried humanity across continents and through centuries.More than a marker of time,the horse embodies vitality,courage,and the relentless spirit to move forward,qualities that resonate not only in China but across the landscapes of many African societies.展开更多
Urban environments offer a wealth of opportunities for residents to respite from their hectic life.Outdoor running or jogging becomes increasingly popular of an option.Impacts of urban environments on outdoor running,...Urban environments offer a wealth of opportunities for residents to respite from their hectic life.Outdoor running or jogging becomes increasingly popular of an option.Impacts of urban environments on outdoor running,despite some initial studies,remain underexplored.This study aims to establish an analytical framework that can holistically assess the urban environment on the healthy vitality of running.The proposed framework is applied to two modern Chinese cities,i.e.,Guangzhou and Shenzhen.We construct three interpretable random forest models to explore the non-linear relationship between environmental variables and running intensity(RI)through analyzing the runners'trajectories and integrating with multi-source urban big data(e.g.,street view imagery,remote sensing,and socio-economic data)across the built,natural,and social dimensions,The findings uncover that road density has the greatest impact on RI,and social variables(e.g.,population density and housing price)and natural variables(e.g.,slope and humidity)all make notable impact on outdoor running.Despite these findings,the impact of environmental variables likely change across different regions due to disparate regional construction and micro-environments,and those specific impacts as well as optimal thresholds also alter.Therefore,construction of healthy cities should take the whole urban environment into account and adapt to local conditions.This study provides a comprehensive evaluation on the influencing variables of healthy vitality and guides sustainable urban planning for creating running-friendly cities.展开更多
The effects of the built environment factors on urban vitality have attracted wide attention in the urban planning fields in recent years,but few studies have considered the variables’relative importance and their no...The effects of the built environment factors on urban vitality have attracted wide attention in the urban planning fields in recent years,but few studies have considered the variables’relative importance and their nonlinear effects on urban vitality.Taking a Chinese metropolis—Hangzhou as a case study,this study applied the gradient boosting decision tree(GBDT)model to explore the nonlinear effects of the 5D factors of the urban built environment on urban social vitality and economic vitality and the importance of variables.The results show that the GBDT model has better goodness of fit than the traditional ordinary least squares(OLS)regression in the urban vitality models.The urban built environment plays an important role in affecting urban vitality,while built environment designs witness the most important effect.Specifically,the density of shopping facilities,medical facilities,and road networks are the most important factors affecting urban social vitality,while road network density,destination accessibility,and population density play the most important roles in affecting urban economic vitality.Finally,the urban built environment factors have nonlinear threshold effects on both urban economic and social vitality in Hangzhou,with differing nonlinear response patterns observed between social and economic dimensions.展开更多
Urban vitality is one of the key indicators of sustainable urban development and an important factor for shrinking cities to achieve internal optimization.The relationship between the built environment and urban vital...Urban vitality is one of the key indicators of sustainable urban development and an important factor for shrinking cities to achieve internal optimization.The relationship between the built environment and urban vitality has been extensively discussed.However,the moderating effect of housing vacancy on the built environment’s effect on urban vitality in shrinking cities has not been explored in detail.This paper selected Yichun District in Yichun City of Heilongjiang Province,a typical shrinking city in Northeast China,as the study area,focusing on the effect of the built environment on urban vitality in shrinking cities based on residential and commercial electricity consumption data for 2013 and 2018.Moreover,this study also explored the moderating mechanisms of residential and commercial housing vacancies on the built environment’s effect on urban vitality.The results demonstrate that the spatial pattern of urban vitality in the Yichun District is‘high in the center and low in the periphery’.Population density,building age,road density,and catering facilities are recognized as the main built environment factors affecting the vitality of shrinking cities.Residential and commercial housing vacancies have a significant moderating effect on the built environment’s effect on urban vitality.Residential housing vacancies enhance the positive effect of road density and the negative effect of greening rate.In addition,commercial housing vacancies suppress the positive effect of building density and enhance the positive effect of accessibility to urban service facilities.The study indicates that built environment factors exhibit heterogeneous effects on vitality in the context of urban shrinkage,as moderated by housing vacancies.Targeted regulation of built environment factors is of practical significance in realizing the internal development and vitality enhancement of shrinking cities.展开更多
The fresh pollen vitality, the effect of different storage conditions on the pollen vitality, and the difference of vitality among the species of seven species of Syringa were determined in Shenyang, China. The result...The fresh pollen vitality, the effect of different storage conditions on the pollen vitality, and the difference of vitality among the species of seven species of Syringa were determined in Shenyang, China. The results indicated that the pollen vi-tality (81.5%) of Syringa villosa was the highest among the seven tested species, followed by S. microphylla and S. meyeri, and that of S. oblata var. affinis was the lowest. The low temperature was the best condition for storage of pollen of Syringa, and the most proper temperature for the storage was 0-2 癈. The storability of S. microphylla was the best of all, and it could be stored over 60 days at the temperature of 0-2 癈, next was S. villosa and S. meyeri.展开更多
[Objective] This study aimed to investigate the effects of different salt concentrations on the root vitality of Limonium bicolor （Bunge） Kuntze. [Method] Limonium bicolor （Bunge） Kuntze was treated with 0, 100, 2...[Objective] This study aimed to investigate the effects of different salt concentrations on the root vitality of Limonium bicolor （Bunge） Kuntze. [Method] Limonium bicolor （Bunge） Kuntze was treated with 0, 100, 200 and 400 mmol/L NaCl, respectively. After two weeks, root vitality, biomass and other physiological indicators were measured. [Result] Salt stress had significant influences on the growth of roots. Root vitality of Limonium bicolor increased firstly and reduced gradually with the increase of salt concentration. [Conclusion] The results indicate that Limonium bicolor has certain salt tolerance ability at low salt concentrations; under relatively high salt concentrations, Limonium bicolor roots can maintain high vitality; however, with the continuous increase of salt concentration, Limonium bicolor roots are damaged, with decreasing vitality.展开更多
Since 2000, the Chinese government has implemented emergency water diversion measures to restore the damaged riparian forest ecosystem with dominant tree species Euphrat poplar(Populus euphratica Oliv.)at the lower re...Since 2000, the Chinese government has implemented emergency water diversion measures to restore the damaged riparian forest ecosystem with dominant tree species Euphrat poplar(Populus euphratica Oliv.)at the lower reaches of the Tarim River. In the present study, comparative analysis of variations in the vitality of P. euphratica trees were made using 2005 and 2010 data to illustrate the revitalization process of riparian forest. Poplar trees within 300 m of the riverbed were positively revitalized, while the vitality of trees farther than 300 m from the river decreased. Population structure was studied to demonstrate the development of poplar community. In the first belt, the class structure for the diameter at breast height(DBH) of P. euphratica fit a logistic model, and the 2nd, 3rd and 4th belt curve fittings were close to a Gaussian model; in other plots they were bimodal. Cluster analysis of the composition of the DBH class of poplar trees demonstrated that those within 16–36 cm DBH were the most abundant(58.49% of total) in study area, under 16 cm of DBH were second(31.36%), and trees >40 cm DBH were the least abundant(10.15%). More than 80% of the trees were young and medium-sized, which means that the poplar forest community in the vicinity of the lower Tarim River is at a stable developmental stage. The abundance of juvenile trees of P. euphratica in the first and second measuring belts was 12.13% in 2005 and increased to 25.52% in 2010, which means that the emergency water transfer had a positive impact on the generation of young P. euphratica trees in the vicinity of the river.展开更多
As a well-known urban landscape concept to describe urban space quality,urban street vitality is a subjective human perception of the urban environment but difficult to evaluate directly from the physical space.The st...As a well-known urban landscape concept to describe urban space quality,urban street vitality is a subjective human perception of the urban environment but difficult to evaluate directly from the physical space.The study utilized a modern machine learning computer vision algorithm in the urban build environment to simulate the process,which starts with the visual perception of the urban street landscape and ends with the human reaction to street vitality.By analyzing the optimized trained model,we tried to identify urban street vitality’s visual features and evaluate their importance.A region around the Mochou Lake in Nanjing,China,was set as our study area.Seven investigators surveyed the area,recorded their evaluation score on each site’s vitality level with a corresponding picture taken on site.A total of 370 pictures and recorded score pairs from 231 valid survey sites were used to train a convolutional neural network.After optimization,a deep neural network model with 43 layers,including 11 convolutional ones,was created.Heat maps were then used to identify the features which lead to high vitality score outputs.The spatial distributions of different types of feature entities were also analyzed to help identify the spatial effects.The study found that visual features,including human,construction site,shop front,and roadside/walking pavement,are vital ones that correspond to the vitality of the urban street.The consistency of these critical features with traditional urban vitality features indicates the model had learned useful knowledge from the training process.Applying the trained model in urban planning practices can help to improve the city environment for better attraction of residents’activities and communications.展开更多
The number of urban vitality assessment studies is rising continuously,owing to the emergence of geographic data.The current literature focuses primarily on evaluation,rather than implementation,of urban vitality.Henc...The number of urban vitality assessment studies is rising continuously,owing to the emergence of geographic data.The current literature focuses primarily on evaluation,rather than implementation,of urban vitality.Hence,a scoping review and research agenda are needed for urban vitality research to be more practical.This study aims to fill the research gap by exploring the content and methods of vitality assessment that can make urban vitality research more compatible with policy,planning,and design practice.We chose the neighborhood scale,which is the most practical initiative unit for vitality enhancement.We discovered that the gaps between the current research and practice primarily lie in the diversity of research subjects,the authenticity and comprehensiveness of vitality measurement,and the multi-domain of impact factor analysis.On this basis,we classified the following expandable aspects:(1) multi-type,multi-dimensional,multi-temporal,and implementation-adaptive vitality evaluation;(2) methods reflecting high-quality social interactions and the perceptions of vulnerable groups;(3) how design and urban management impacts vitality;and(4) the synergistic effects of multiple indicators on vitality.Overall,the research content and methodology presented in this paper can help neighborhood-scale vitality assessment to provide more meaningful insights for policy makers and practitioners.展开更多
The effects of membrane penetrating anti-freezing agents(MPAAs), DMSO(dimethyl sulfoxide),glycerol,EG(ethylene glycol) and methanol in combination with different cryoprotective additives suchas carbohydrates,macromole...The effects of membrane penetrating anti-freezing agents(MPAAs), DMSO(dimethyl sulfoxide),glycerol,EG(ethylene glycol) and methanol in combination with different cryoprotective additives suchas carbohydrates,macromolecules and inorganic compounds on the spermatozoon vitality of Chinesescallop,Chlamys farreri,during 1 h 0℃ equilibrium were investigated.When only MPAAs existed,the detrimental effects of different MPAAs ranked in the following order:DMSO【methanol【EG【glycerol.When carbohydrates were added into MPAAs solution,5% glucose caused larger decrease ofspermatozoon vitality than 2.4% lactose.5% glucose or 2.4% lactose in 7.5% glycerol caused com-plete damage.10% yolk was best in maintaining the spermatozoon vitality except when used incombination with 10% methanol.10% milk significantly decreased spermatozoon vitality in EG andmethanol and enhanced its vitality in glycerol,but did not significantly influence it in DMSO.Glycinewas apparently detrimental to spermatozoon vitality.The average展开更多
The literature on urban vitality tends to focus on the built environment.This paper argues that some important processes in shaping vitality may be overlooked without examining the intensity and diversity of economic ...The literature on urban vitality tends to focus on the built environment.This paper argues that some important processes in shaping vitality may be overlooked without examining the intensity and diversity of economic and human activities.Using newly developed spatial big data and adopting the methods of multi-indicator measurement and spatial analysis methods,we analyzed the pattern of urban vitality in Chongqing,a provincial city in western China and,on this basis,evaluated the creation and maintenance of urban vitality from the economic and human activities perspective.Our findings indicate that the impacts of economic and human activities are positive and significant.Among the three intensity and diversity indicators,economic intensity and population density show an effect on urban vitality stronger than that of economic diversity.However,economic diversity has the strongest superposition or interactive effect,and is thus an important foundation dynamic.The positive effect of population density on urban vitality is largely a result of Chongqing’s jobs-housing balance.The case of Chongqing highlights the importance of topographic features,historical inheritance,large-scale migration,and cultural activities in shaping the distinctive vitality pattern of a city.This study contends that the creation and maintenance of urban vitality can not be fully explained without incorporating the impacts of economic and human activities.It contributes to a comprehensive measurement of urban vitality and enriches its connotations.展开更多
Revitalization of waterfront-a precious resource of city has gradually become popular worldwide. Cities around the Three Gorges Reservoir grow and proper for the Yangtze River,thus waterfront in these cities has been ...Revitalization of waterfront-a precious resource of city has gradually become popular worldwide. Cities around the Three Gorges Reservoir grow and proper for the Yangtze River,thus waterfront in these cities has been long ignored or faced with "constructive destruction" with the city development. This paper divided urban waterfront public spaces around the Three Gorges into 3 kinds of spaces,namely point,line and surface,from the perspective of typology,and put forward strategies such as functional renovation,and improvement of spatial scale from the perspectives of land use and traffic,to enhance the vitality of waterfront public space.展开更多
There is a long history of studies on the bad influence of smoking on our bodies, with many study results accumulated to date indicating a decline in the smoking rate. However, the smoking rate in Japan is still highe...There is a long history of studies on the bad influence of smoking on our bodies, with many study results accumulated to date indicating a decline in the smoking rate. However, the smoking rate in Japan is still higher than that in other countries. In order to reveal the various influences due to smoking, we examined the changes in lifestyle and vitality prior to and the following smoking, targeting college students who are at the early age of starting to smoke. The subjects were 213 college students (83 men and 130 women). Smoking frequency as well as sleeping, eating habits, exercise, and vitality as a lifestyle were surveyed through a questionnaire survey. As a result of comparing smoking and lifestyle between the smoking group and non-smoking group, in terms of sleep, the bedtime and wake-up time tended to be late in the smoking group. Regarding eating habits, there was a tendency for the smoking group to have a high rate of skipping breakfast and a high intake rate of midnight snacks. Regarding exercise, the number of people exercising on a daily basis was small in both the smoking group and the non-smoking group, with no significant difference observed. Therefore, this study revealed that smoking has a negative influence on some aspects of lifestyle. There was no significant relationship in terms of the effects of smoking on vitality. Going forward, it will be necessary to clarify the negative effects of smoking on mental health.展开更多
There are four main vitality states of human body in Traditional Chinese Medicine (TCM). Eye is the most important part on face for TCM doctors to diagnose patient. In this paper,we present several methods of eye quan...There are four main vitality states of human body in Traditional Chinese Medicine (TCM). Eye is the most important part on face for TCM doctors to diagnose patient. In this paper,we present several methods of eye quantification. We quantify eye movement,venation in white part of eye,tears in eye and the shape of upper eyelid,and then use cloud model to deduce volunteers' vitality condition by these measurements. We collect more than one thousand face images and dozens of face videos of patients',and some rules we mined with the highest support and interesting scores are right correspond to TCM diagnosis.展开更多
As display window of urban vitality,public space carries the colorful life of the residents living here and shows the spiritual outlook of a certain region.As a rising star,new urban area lacks historical accumulation...As display window of urban vitality,public space carries the colorful life of the residents living here and shows the spiritual outlook of a certain region.As a rising star,new urban area lacks historical accumulation and smell of fireworks when compared with old urban area.How to stimulate the vitality of public space in new urban area has become an unavoidable problem.In this paper,Honggutan New District of Nanchang City is taken as research object,to analyze the relationship between the representation of population vitality and the physical space in new urban area,and explore strategies for creating vitality of public space in new urban area.展开更多
As an important goal of urban design research,the evaluation of urban spatial vitality has been widely concerned.Taking Shenzhen as an example,the urban built-up area of Shenzhen was identifi ed using improved DENsi-G...As an important goal of urban design research,the evaluation of urban spatial vitality has been widely concerned.Taking Shenzhen as an example,the urban built-up area of Shenzhen was identifi ed using improved DENsi-Graph analysis,from the perspective of quantifi cation of urban spatial morphological features.The accessibility of urban streets,degree of construction and architectural form,and degree of functional mixing were quantitatively analyzed through space syntax,space matrix and mixeduse index(MXI),and the spatial vitality of urban built-up area was evaluated.Research results demonstrated that the improved Densi-Graph analysis could better identify the built-up area of Shenzhen,and the overall classifi cation accuracy was 0.810.The analysis results of spatial vitality showed that the urban spatial vitality in Shenzhen urban built-up area was well created.The street accessibility of Shenzhen generally hindered the creation of urban vitality;the spatial matrix value in the north of Shenzhen urban built-up area was lower;and the MXI of most areas within the study area was above the medium.展开更多
Historical and cultural blocks are witnesses of history and inheritors of culture. As one of the main spaces for outdoor interaction in historical and cultural blocks, the improvement of its vitality is of great signi...Historical and cultural blocks are witnesses of history and inheritors of culture. As one of the main spaces for outdoor interaction in historical and cultural blocks, the improvement of its vitality is of great significance for the improvement of residential environment and the better inheritance of history and culture. Taking Daopashi Street in Anqing City as an example, an evaluation model of landscape spatial vitality of historical and cultural blocks was constructed from three aspects of viewing function, store status and service facilities, and analytic hierarchy process was used to determine the index weight and vaguely evaluate the landscape spatial vitality of historical and cultural blocks. The results show that through the comparison of weight, architectural style(0.317), the practicability of service facilities(0.168) and plant landscape(0.165) had a significant impact on the landscape spatial vitality of historical and cultural blocks,and the landscape spatial vitality of historical and cultural blocks in Daopashi Street in Anqing City was at a good level.展开更多
In the continuous growth process of urbanization level in China,the community is gradually divided,and the urban vitality is gradually lost.Under the community management mode of grass-roots autonomy,cultivation of co...In the continuous growth process of urbanization level in China,the community is gradually divided,and the urban vitality is gradually lost.Under the community management mode of grass-roots autonomy,cultivation of community identity is conducive to creating an unique community culture,making the whole community more united and cohesive,moulding a relaxed and pleasant community atmosphere,thereby enhancing the vitality of the street.Community identity also provides a new perspective for the study of the relationship between people and street vitality.In this paper,the influence of community identity on the spatial vitality of urban street is discussed,and the corresponding improvement measures are put forward.展开更多
As the basic unit of urban system,street is not only an important traffi c link in the city,but also an important carrier refl ecting urban life.As one of the public spaces in the city,streets provide places for vario...As the basic unit of urban system,street is not only an important traffi c link in the city,but also an important carrier refl ecting urban life.As one of the public spaces in the city,streets provide places for various outdoor activities,such as leisure,shopping,social contact and commercial publicity.The number of people and the duration that people stay in the streets for various activities constitute the vitality of streets.The vitality of streets can also be regarded as the vitality of cities to a certain extent.As one of the key infl uencing factors of street vitality,street traffi c accessibility has important research value.Based on the perspective of street traffi c accessibility,the dynamic factors affecting life streets are explored,and the design method of shaping street vitality is discussed through the analysis of practical cases in Nanchang City.展开更多
From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking ...From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking Minde Road in Nanchang City as an example,the continuity of the interface of Minde Roadis analyzed from the two elements of architectural interface and environmental interface,and the infl uenceof street interface continuity on behavior psychology and activities of people in the street is studied.Themethod of reforming and utilizing street–side interface and enhancing continuity of street–side interface isput forward to realize the improvement of street vitality.展开更多
文摘In the Chinese lunar calendar,2026 ushers in the Year of the Horse,a creature that has carried humanity across continents and through centuries.More than a marker of time,the horse embodies vitality,courage,and the relentless spirit to move forward,qualities that resonate not only in China but across the landscapes of many African societies.
基金National Natural Science Foundation of China,No.42171455The Hong Kong RGC Research Impact Fund,No.R5011-23The Hong Kong General Research Fund,No.15204121。
文摘Urban environments offer a wealth of opportunities for residents to respite from their hectic life.Outdoor running or jogging becomes increasingly popular of an option.Impacts of urban environments on outdoor running,despite some initial studies,remain underexplored.This study aims to establish an analytical framework that can holistically assess the urban environment on the healthy vitality of running.The proposed framework is applied to two modern Chinese cities,i.e.,Guangzhou and Shenzhen.We construct three interpretable random forest models to explore the non-linear relationship between environmental variables and running intensity(RI)through analyzing the runners'trajectories and integrating with multi-source urban big data(e.g.,street view imagery,remote sensing,and socio-economic data)across the built,natural,and social dimensions,The findings uncover that road density has the greatest impact on RI,and social variables(e.g.,population density and housing price)and natural variables(e.g.,slope and humidity)all make notable impact on outdoor running.Despite these findings,the impact of environmental variables likely change across different regions due to disparate regional construction and micro-environments,and those specific impacts as well as optimal thresholds also alter.Therefore,construction of healthy cities should take the whole urban environment into account and adapt to local conditions.This study provides a comprehensive evaluation on the influencing variables of healthy vitality and guides sustainable urban planning for creating running-friendly cities.
基金National Social Science Foundation of China,No.20FJLB025National Natural Science Foundation of China,No.42471207,No.42471203Zhejiang Province Philosophy and Social Science Planning,Zhijiang Youth Special Project,24ZJQN118Y。
文摘The effects of the built environment factors on urban vitality have attracted wide attention in the urban planning fields in recent years,but few studies have considered the variables’relative importance and their nonlinear effects on urban vitality.Taking a Chinese metropolis—Hangzhou as a case study,this study applied the gradient boosting decision tree(GBDT)model to explore the nonlinear effects of the 5D factors of the urban built environment on urban social vitality and economic vitality and the importance of variables.The results show that the GBDT model has better goodness of fit than the traditional ordinary least squares(OLS)regression in the urban vitality models.The urban built environment plays an important role in affecting urban vitality,while built environment designs witness the most important effect.Specifically,the density of shopping facilities,medical facilities,and road networks are the most important factors affecting urban social vitality,while road network density,destination accessibility,and population density play the most important roles in affecting urban economic vitality.Finally,the urban built environment factors have nonlinear threshold effects on both urban economic and social vitality in Hangzhou,with differing nonlinear response patterns observed between social and economic dimensions.
基金Under the auspices of the National Natural Science Foundation of China(No.42171191,41771172,42201211,42401249)Science and Technology Development Plan Project of Jilin Province,China(No.20220508025RC)Young Scientist Group Project of Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences(No.2022QNXZ02)。
文摘Urban vitality is one of the key indicators of sustainable urban development and an important factor for shrinking cities to achieve internal optimization.The relationship between the built environment and urban vitality has been extensively discussed.However,the moderating effect of housing vacancy on the built environment’s effect on urban vitality in shrinking cities has not been explored in detail.This paper selected Yichun District in Yichun City of Heilongjiang Province,a typical shrinking city in Northeast China,as the study area,focusing on the effect of the built environment on urban vitality in shrinking cities based on residential and commercial electricity consumption data for 2013 and 2018.Moreover,this study also explored the moderating mechanisms of residential and commercial housing vacancies on the built environment’s effect on urban vitality.The results demonstrate that the spatial pattern of urban vitality in the Yichun District is‘high in the center and low in the periphery’.Population density,building age,road density,and catering facilities are recognized as the main built environment factors affecting the vitality of shrinking cities.Residential and commercial housing vacancies have a significant moderating effect on the built environment’s effect on urban vitality.Residential housing vacancies enhance the positive effect of road density and the negative effect of greening rate.In addition,commercial housing vacancies suppress the positive effect of building density and enhance the positive effect of accessibility to urban service facilities.The study indicates that built environment factors exhibit heterogeneous effects on vitality in the context of urban shrinkage,as moderated by housing vacancies.Targeted regulation of built environment factors is of practical significance in realizing the internal development and vitality enhancement of shrinking cities.
基金This research is supported by the NKBRSF (G1999043407-1) Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-406 & SCXZD0101).
文摘The fresh pollen vitality, the effect of different storage conditions on the pollen vitality, and the difference of vitality among the species of seven species of Syringa were determined in Shenyang, China. The results indicated that the pollen vi-tality (81.5%) of Syringa villosa was the highest among the seven tested species, followed by S. microphylla and S. meyeri, and that of S. oblata var. affinis was the lowest. The low temperature was the best condition for storage of pollen of Syringa, and the most proper temperature for the storage was 0-2 癈. The storability of S. microphylla was the best of all, and it could be stored over 60 days at the temperature of 0-2 癈, next was S. villosa and S. meyeri.
基金Supported by National High-Technology Research and Development Program(863)(2007AA091701)~~
文摘[Objective] This study aimed to investigate the effects of different salt concentrations on the root vitality of Limonium bicolor （Bunge） Kuntze. [Method] Limonium bicolor （Bunge） Kuntze was treated with 0, 100, 200 and 400 mmol/L NaCl, respectively. After two weeks, root vitality, biomass and other physiological indicators were measured. [Result] Salt stress had significant influences on the growth of roots. Root vitality of Limonium bicolor increased firstly and reduced gradually with the increase of salt concentration. [Conclusion] The results indicate that Limonium bicolor has certain salt tolerance ability at low salt concentrations; under relatively high salt concentrations, Limonium bicolor roots can maintain high vitality; however, with the continuous increase of salt concentration, Limonium bicolor roots are damaged, with decreasing vitality.
基金supported by National Natural Science Foundation of China(Grant Nos:31360200,31270742)the German Volkswagen Foundation within the framework of EcoCAR project(Az.:88497)
文摘Since 2000, the Chinese government has implemented emergency water diversion measures to restore the damaged riparian forest ecosystem with dominant tree species Euphrat poplar(Populus euphratica Oliv.)at the lower reaches of the Tarim River. In the present study, comparative analysis of variations in the vitality of P. euphratica trees were made using 2005 and 2010 data to illustrate the revitalization process of riparian forest. Poplar trees within 300 m of the riverbed were positively revitalized, while the vitality of trees farther than 300 m from the river decreased. Population structure was studied to demonstrate the development of poplar community. In the first belt, the class structure for the diameter at breast height(DBH) of P. euphratica fit a logistic model, and the 2nd, 3rd and 4th belt curve fittings were close to a Gaussian model; in other plots they were bimodal. Cluster analysis of the composition of the DBH class of poplar trees demonstrated that those within 16–36 cm DBH were the most abundant(58.49% of total) in study area, under 16 cm of DBH were second(31.36%), and trees >40 cm DBH were the least abundant(10.15%). More than 80% of the trees were young and medium-sized, which means that the poplar forest community in the vicinity of the lower Tarim River is at a stable developmental stage. The abundance of juvenile trees of P. euphratica in the first and second measuring belts was 12.13% in 2005 and increased to 25.52% in 2010, which means that the emergency water transfer had a positive impact on the generation of young P. euphratica trees in the vicinity of the river.
基金This work was supported by the China Scholarship Council[grant number 201706195004]the National Natural Science Foundation of China[grant numbers 41001093 and 51778278]the Social Science Foundation of Jiangsu Province,China[grant number 18GLB014].
文摘As a well-known urban landscape concept to describe urban space quality,urban street vitality is a subjective human perception of the urban environment but difficult to evaluate directly from the physical space.The study utilized a modern machine learning computer vision algorithm in the urban build environment to simulate the process,which starts with the visual perception of the urban street landscape and ends with the human reaction to street vitality.By analyzing the optimized trained model,we tried to identify urban street vitality’s visual features and evaluate their importance.A region around the Mochou Lake in Nanjing,China,was set as our study area.Seven investigators surveyed the area,recorded their evaluation score on each site’s vitality level with a corresponding picture taken on site.A total of 370 pictures and recorded score pairs from 231 valid survey sites were used to train a convolutional neural network.After optimization,a deep neural network model with 43 layers,including 11 convolutional ones,was created.Heat maps were then used to identify the features which lead to high vitality score outputs.The spatial distributions of different types of feature entities were also analyzed to help identify the spatial effects.The study found that visual features,including human,construction site,shop front,and roadside/walking pavement,are vital ones that correspond to the vitality of the urban street.The consistency of these critical features with traditional urban vitality features indicates the model had learned useful knowledge from the training process.Applying the trained model in urban planning practices can help to improve the city environment for better attraction of residents’activities and communications.
基金National Natural Science Foundation of China,No.51908495。
文摘The number of urban vitality assessment studies is rising continuously,owing to the emergence of geographic data.The current literature focuses primarily on evaluation,rather than implementation,of urban vitality.Hence,a scoping review and research agenda are needed for urban vitality research to be more practical.This study aims to fill the research gap by exploring the content and methods of vitality assessment that can make urban vitality research more compatible with policy,planning,and design practice.We chose the neighborhood scale,which is the most practical initiative unit for vitality enhancement.We discovered that the gaps between the current research and practice primarily lie in the diversity of research subjects,the authenticity and comprehensiveness of vitality measurement,and the multi-domain of impact factor analysis.On this basis,we classified the following expandable aspects:(1) multi-type,multi-dimensional,multi-temporal,and implementation-adaptive vitality evaluation;(2) methods reflecting high-quality social interactions and the perceptions of vulnerable groups;(3) how design and urban management impacts vitality;and(4) the synergistic effects of multiple indicators on vitality.Overall,the research content and methodology presented in this paper can help neighborhood-scale vitality assessment to provide more meaningful insights for policy makers and practitioners.
文摘The effects of membrane penetrating anti-freezing agents(MPAAs), DMSO(dimethyl sulfoxide),glycerol,EG(ethylene glycol) and methanol in combination with different cryoprotective additives suchas carbohydrates,macromolecules and inorganic compounds on the spermatozoon vitality of Chinesescallop,Chlamys farreri,during 1 h 0℃ equilibrium were investigated.When only MPAAs existed,the detrimental effects of different MPAAs ranked in the following order:DMSO【methanol【EG【glycerol.When carbohydrates were added into MPAAs solution,5% glucose caused larger decrease ofspermatozoon vitality than 2.4% lactose.5% glucose or 2.4% lactose in 7.5% glycerol caused com-plete damage.10% yolk was best in maintaining the spermatozoon vitality except when used incombination with 10% methanol.10% milk significantly decreased spermatozoon vitality in EG andmethanol and enhanced its vitality in glycerol,but did not significantly influence it in DMSO.Glycinewas apparently detrimental to spermatozoon vitality.The average
基金Under the auspices of the National Natural Science Foundation of China(No.42071178,41671139)。
文摘The literature on urban vitality tends to focus on the built environment.This paper argues that some important processes in shaping vitality may be overlooked without examining the intensity and diversity of economic and human activities.Using newly developed spatial big data and adopting the methods of multi-indicator measurement and spatial analysis methods,we analyzed the pattern of urban vitality in Chongqing,a provincial city in western China and,on this basis,evaluated the creation and maintenance of urban vitality from the economic and human activities perspective.Our findings indicate that the impacts of economic and human activities are positive and significant.Among the three intensity and diversity indicators,economic intensity and population density show an effect on urban vitality stronger than that of economic diversity.However,economic diversity has the strongest superposition or interactive effect,and is thus an important foundation dynamic.The positive effect of population density on urban vitality is largely a result of Chongqing’s jobs-housing balance.The case of Chongqing highlights the importance of topographic features,historical inheritance,large-scale migration,and cultural activities in shaping the distinctive vitality pattern of a city.This study contends that the creation and maintenance of urban vitality can not be fully explained without incorporating the impacts of economic and human activities.It contributes to a comprehensive measurement of urban vitality and enriches its connotations.
文摘Revitalization of waterfront-a precious resource of city has gradually become popular worldwide. Cities around the Three Gorges Reservoir grow and proper for the Yangtze River,thus waterfront in these cities has been long ignored or faced with "constructive destruction" with the city development. This paper divided urban waterfront public spaces around the Three Gorges into 3 kinds of spaces,namely point,line and surface,from the perspective of typology,and put forward strategies such as functional renovation,and improvement of spatial scale from the perspectives of land use and traffic,to enhance the vitality of waterfront public space.
文摘There is a long history of studies on the bad influence of smoking on our bodies, with many study results accumulated to date indicating a decline in the smoking rate. However, the smoking rate in Japan is still higher than that in other countries. In order to reveal the various influences due to smoking, we examined the changes in lifestyle and vitality prior to and the following smoking, targeting college students who are at the early age of starting to smoke. The subjects were 213 college students (83 men and 130 women). Smoking frequency as well as sleeping, eating habits, exercise, and vitality as a lifestyle were surveyed through a questionnaire survey. As a result of comparing smoking and lifestyle between the smoking group and non-smoking group, in terms of sleep, the bedtime and wake-up time tended to be late in the smoking group. Regarding eating habits, there was a tendency for the smoking group to have a high rate of skipping breakfast and a high intake rate of midnight snacks. Regarding exercise, the number of people exercising on a daily basis was small in both the smoking group and the non-smoking group, with no significant difference observed. Therefore, this study revealed that smoking has a negative influence on some aspects of lifestyle. There was no significant relationship in terms of the effects of smoking on vitality. Going forward, it will be necessary to clarify the negative effects of smoking on mental health.
基金National Natural Science Foundations of China (No.60873179, No.60672018)
文摘There are four main vitality states of human body in Traditional Chinese Medicine (TCM). Eye is the most important part on face for TCM doctors to diagnose patient. In this paper,we present several methods of eye quantification. We quantify eye movement,venation in white part of eye,tears in eye and the shape of upper eyelid,and then use cloud model to deduce volunteers' vitality condition by these measurements. We collect more than one thousand face images and dozens of face videos of patients',and some rules we mined with the highest support and interesting scores are right correspond to TCM diagnosis.
文摘As display window of urban vitality,public space carries the colorful life of the residents living here and shows the spiritual outlook of a certain region.As a rising star,new urban area lacks historical accumulation and smell of fireworks when compared with old urban area.How to stimulate the vitality of public space in new urban area has become an unavoidable problem.In this paper,Honggutan New District of Nanchang City is taken as research object,to analyze the relationship between the representation of population vitality and the physical space in new urban area,and explore strategies for creating vitality of public space in new urban area.
基金National Natural Science Foundation of China(416711800).
文摘As an important goal of urban design research,the evaluation of urban spatial vitality has been widely concerned.Taking Shenzhen as an example,the urban built-up area of Shenzhen was identifi ed using improved DENsi-Graph analysis,from the perspective of quantifi cation of urban spatial morphological features.The accessibility of urban streets,degree of construction and architectural form,and degree of functional mixing were quantitatively analyzed through space syntax,space matrix and mixeduse index(MXI),and the spatial vitality of urban built-up area was evaluated.Research results demonstrated that the improved Densi-Graph analysis could better identify the built-up area of Shenzhen,and the overall classifi cation accuracy was 0.810.The analysis results of spatial vitality showed that the urban spatial vitality in Shenzhen urban built-up area was well created.The street accessibility of Shenzhen generally hindered the creation of urban vitality;the spatial matrix value in the north of Shenzhen urban built-up area was lower;and the MXI of most areas within the study area was above the medium.
基金the Research on the Application of the Perception Teaching of“Graphics”in Architectural Design Course(JZ213702)Landscape Architecture Stracture(JZ213704)+1 种基金Research on the Teaching of Architectural Design Course for Urban and Rural Planning Major with the concept of“Local Design”(JZ223706)Anhui Provincial Key Laboratory of Huizhou Architecture Open Subjects Funding Project(HPJZ-2020-03).
文摘Historical and cultural blocks are witnesses of history and inheritors of culture. As one of the main spaces for outdoor interaction in historical and cultural blocks, the improvement of its vitality is of great significance for the improvement of residential environment and the better inheritance of history and culture. Taking Daopashi Street in Anqing City as an example, an evaluation model of landscape spatial vitality of historical and cultural blocks was constructed from three aspects of viewing function, store status and service facilities, and analytic hierarchy process was used to determine the index weight and vaguely evaluate the landscape spatial vitality of historical and cultural blocks. The results show that through the comparison of weight, architectural style(0.317), the practicability of service facilities(0.168) and plant landscape(0.165) had a significant impact on the landscape spatial vitality of historical and cultural blocks,and the landscape spatial vitality of historical and cultural blocks in Daopashi Street in Anqing City was at a good level.
文摘In the continuous growth process of urbanization level in China,the community is gradually divided,and the urban vitality is gradually lost.Under the community management mode of grass-roots autonomy,cultivation of community identity is conducive to creating an unique community culture,making the whole community more united and cohesive,moulding a relaxed and pleasant community atmosphere,thereby enhancing the vitality of the street.Community identity also provides a new perspective for the study of the relationship between people and street vitality.In this paper,the influence of community identity on the spatial vitality of urban street is discussed,and the corresponding improvement measures are put forward.
文摘As the basic unit of urban system,street is not only an important traffi c link in the city,but also an important carrier refl ecting urban life.As one of the public spaces in the city,streets provide places for various outdoor activities,such as leisure,shopping,social contact and commercial publicity.The number of people and the duration that people stay in the streets for various activities constitute the vitality of streets.The vitality of streets can also be regarded as the vitality of cities to a certain extent.As one of the key infl uencing factors of street vitality,street traffi c accessibility has important research value.Based on the perspective of street traffi c accessibility,the dynamic factors affecting life streets are explored,and the design method of shaping street vitality is discussed through the analysis of practical cases in Nanchang City.
文摘From the perspective of continuous perception and interaction between people and street–sideinterface,the relationship between continuity of street–side interface and street vitality is discussed in thepaper.Taking Minde Road in Nanchang City as an example,the continuity of the interface of Minde Roadis analyzed from the two elements of architectural interface and environmental interface,and the infl uenceof street interface continuity on behavior psychology and activities of people in the street is studied.Themethod of reforming and utilizing street–side interface and enhancing continuity of street–side interface isput forward to realize the improvement of street vitality.
