The intellectual capital efficiency and corporate sustainable growth nexus: comparison from agriculture,tourism and renewable energy sector

Environment, Development and Sustainability - In the new situation of Chinese economic development, how to achieve sustainable development of enterprises has become an important issue concerned by...     

Urbanization and small household agricultural land use choices in the Brazilian Amazon and the role for the water chemistry of small streams

Many small watersheds and streams in the Brazilian Amazon have been impacted by agriculture and urban development, often due to household economic needs and migration processes. This study examined the relationships between land use, soil type, and household factors on stream water chemistry in and near the city of Altamira, Pará, Brazil, in 2008–2009. While soil weathering and stream discharge may have affected several stream water ion concentrations, agriculture and especially urban development were associated with high dissolved nitrogen concentrations, high water temperatures, and low dissolved oxygen concentrations in streams. Younger interviewed households were generally associated with these watersheds, and many urban residents reported disposing of household waste directly into streams. In contrast, older households were generally associated with forest and cocoa agriculture, along with lower water temperatures and higher dissolved oxygen concentrations in streams. These conditions persisted despite reported uses of herbicides and fertilizers by some residents.     

医用诊断X线机房空气中离子浓度的调查

对乌鲁木齐地区５所医院１所卫生防疫站的医用诊断Ｘ射线机房内空气中正负离子浓度进行了调查，结果表明：透视和摄片机房空气中正负离子浓度分别为４７４±１１８，３１２±１０４（个／ｃｍ３）和４０４±１０１，２５６±７８（个／ｃｍ３）．单极系数（ｎ＋／ｎ－）分别为１．５２和１．５８。正离子浓度均高于对照组（Ｐ＜０．０１），ｎ＋／ｎ－相当于对照组的１，３７和１．４２倍。开机后空气中正离子浓度显著高于开机前浓度，ｎ＋／ｎ－开机后相当于开机前的１．６６和１．５９倍，呈现出Ｘ线机房空气中正负离子严重失调。提示应加强有害因素的防护。     

The Effects of Urbanization on Net Primary Productivity in Southeastern China

Net primary productivity (NPP) is one of the major ecosystem products on which human societies rely heavily. However, rapid urban sprawl and its associated dense population and economic conditions have generated great pressure on natural resources, food security, and environments. It is valuable to understand how urban expansion and associated demographic and economic conditions affect ecosystem functions. This research conducted a case study in Southeastern China to examine the impacts of urban expansion and demographic and economic conditions on NPP. The data sources used in research include human settlement developed through a combination of MODIS, DMSP-OLS and Landsat ETM+ images, the annual NPP from MODIS, and the population and gross domestic product (GDP) from the 2000 census data. Multiple regression analysis and nonlinear regression analysis were used to examine the relationships of NPP with settlement, population and GDP. This research indicates that settlement, population and GDP have strongly negative correlation with NPP in Southeastern China, but the outcomes were nonlinear when population or GDP reached certain thresholds.