Of all the methods of studies on bio-estimation of air pollution by lichen flora, the authors cannot justify a choice of one method over another. Consultation of previous work by researchers has allowed us to compare ...Of all the methods of studies on bio-estimation of air pollution by lichen flora, the authors cannot justify a choice of one method over another. Consultation of previous work by researchers has allowed us to compare these methods and to better understand their strengths and limitations. Under the terms of estimating the pollution, these methods are classified into three categories. Some are qualitative, quantitative and others are finally some indirect methods. The methods used to assess the overall air pollution relative value for each station studied. As part of our work, the authors have chosen a quantitative approach based on the combination of two methods. They are based on pollution indices obtained from mathematical formulas based on various parameters related to the lichen flora. They are represented by the I.P. （index poleotolerance） and the I.A.P. （index of atmospheric purity） and these two indices allowed us to map of global air pollution in the city of Skikda and petrochemical industry as well as peri-urban areas （Haddaiek, Hamadi Krouma, Hamrouche Hamoudi, Larbi Ben M＇Hidi）. The authors have identified areas of iso-pollution around different emission centers represented by the largest petrochemical area, traffic and households in urban areas of Skikda, Hamadi Krouma, Hamrouche Hamoudi and Larbi Ben M＇Hidi.展开更多
By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme,the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was invest...By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme,the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was investigated via idealized numerical experiments.Results suggest that large-scale urbanization can cause a significant warming effect in both surface temperature and air temperature near the surface over most areas of East China.Meanwhile,large-scale urbanization also alters the surface energy balance,causing evident increases in net surface long-wave radiation and sensible heat flux as well as intensified surface thermal heating to the atmosphere.Forced by the surface thermal heating anomalies induced by the large-scale urban expansion,East Asian winter monsoon circulation exhibits distinct changes.Overall,the extensive urbanization over East China will weaken East Asian winter monsoon,but intensify winter monsoon in northeast China.展开更多
This article analyzes the impact of urbanization on village democracy in China. The ＂economic absorption and social exclusion＂ of semiurbanization path has attracted rural residents to cities. These people participa...This article analyzes the impact of urbanization on village democracy in China. The ＂economic absorption and social exclusion＂ of semiurbanization path has attracted rural residents to cities. These people participate in the urban economy just as a factor of production （labor） without enjoying the rights that urban citizens（xfiUagers） have. This urbanization path and population mobility has had a profound influence on rural democracy in China. On the one hand, large numbers of young people have left; the traditional villages in central and western China, which are characterized by population output（ many even move with their entire families）, causing the villages to lose their political elite while the interaction chain between villagers has been shortened and social trust in the villages has been weakened, thereby giving rise to a low quality of rural democracy. On the other hand, large numbers of migrant workers have flocked into the urbanized villages in eastern China, which are characterized by population input, and these people far outnumber local residents. Migrant workers are excluded from rural democracy and the governance structure. This local citizenship based on the household registration system restricts the inclusiveness of village democracy.展开更多
文摘Of all the methods of studies on bio-estimation of air pollution by lichen flora, the authors cannot justify a choice of one method over another. Consultation of previous work by researchers has allowed us to compare these methods and to better understand their strengths and limitations. Under the terms of estimating the pollution, these methods are classified into three categories. Some are qualitative, quantitative and others are finally some indirect methods. The methods used to assess the overall air pollution relative value for each station studied. As part of our work, the authors have chosen a quantitative approach based on the combination of two methods. They are based on pollution indices obtained from mathematical formulas based on various parameters related to the lichen flora. They are represented by the I.P. （index poleotolerance） and the I.A.P. （index of atmospheric purity） and these two indices allowed us to map of global air pollution in the city of Skikda and petrochemical industry as well as peri-urban areas （Haddaiek, Hamadi Krouma, Hamrouche Hamoudi, Larbi Ben M＇Hidi）. The authors have identified areas of iso-pollution around different emission centers represented by the largest petrochemical area, traffic and households in urban areas of Skikda, Hamadi Krouma, Hamrouche Hamoudi and Larbi Ben M＇Hidi.
基金supported by the National Basic Research Program of China(2010CB428505 and 2011CB952004)Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institu-tions(PAPD)
文摘By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme,the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was investigated via idealized numerical experiments.Results suggest that large-scale urbanization can cause a significant warming effect in both surface temperature and air temperature near the surface over most areas of East China.Meanwhile,large-scale urbanization also alters the surface energy balance,causing evident increases in net surface long-wave radiation and sensible heat flux as well as intensified surface thermal heating to the atmosphere.Forced by the surface thermal heating anomalies induced by the large-scale urban expansion,East Asian winter monsoon circulation exhibits distinct changes.Overall,the extensive urbanization over East China will weaken East Asian winter monsoon,but intensify winter monsoon in northeast China.
文摘This article analyzes the impact of urbanization on village democracy in China. The ＂economic absorption and social exclusion＂ of semiurbanization path has attracted rural residents to cities. These people participate in the urban economy just as a factor of production （labor） without enjoying the rights that urban citizens（xfiUagers） have. This urbanization path and population mobility has had a profound influence on rural democracy in China. On the one hand, large numbers of young people have left; the traditional villages in central and western China, which are characterized by population output（ many even move with their entire families）, causing the villages to lose their political elite while the interaction chain between villagers has been shortened and social trust in the villages has been weakened, thereby giving rise to a low quality of rural democracy. On the other hand, large numbers of migrant workers have flocked into the urbanized villages in eastern China, which are characterized by population input, and these people far outnumber local residents. Migrant workers are excluded from rural democracy and the governance structure. This local citizenship based on the household registration system restricts the inclusiveness of village democracy.
