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Xu L.,Beijing Normal University | Yin H.,Beijing Normal University | Li Z.,Beijing Normal University | Li S.,The Environmental Protection Information Center
International Journal of Environmental Research and Public Health | Year: 2014

As the land ecosystem provides the necessary basic material resources for human development, land ecological security (LES) plays an increasingly important role in sustainable development. Given the degradation of land ecological security under rapid urbanization and the urgent LES requirements of urban populations, a comprehensive evaluation method, named Double Land Ecological Security (DLES), has been introduced with the city of Guangzhou, China, as a case study, which evaluates the LES in regional and unit scales for reasonable and specific urban planning. In the evaluation process with this method, we have combined the material security with the spiritual security that is inevitably associated with LES. Some new coefficients of land-security supply/demand distribution and technology contribution for LES evaluation have also been introduced for different spatial scales, including the regional and the unit scales. The results for Guangzhou indicated that, temporally, the LES supply indices were 0.77, 0.84 and 0.77 in 2000, 2006 and 2009 respectively, while LES demand indices for the city increased in 2000, 2006 and 2009 from 0.57 to 0.95, which made the LES level decreased slowly in this period. Spatially, at the regional scale, the urban land ecological security (ULES) level decreased from 0.2 (marginal security) to −0.18 (marginal insecurity) as a whole, in unit scale, areas in the north and in parts of the east were relatively secure and the security area was shrinking with time, but the central and southern areas turned to be marginal insecurity, especially in 2006 and 2009. This study proposes that DLES evaluation should be conducted for targeted and efficient urban planning and management, which can reflect the LES level of study area in general and in detail. © 2014 by the authors; licensee MDPI, Basel, Switzerland.


Xu L.Y.,Beijing Normal University | Xie X.D.,Beijing Normal University | Li S.,The Environmental Protection Information Center
Environmental Pollution | Year: 2013

This study combines the methods of observation statistics and remote sensing retrieval, using remote sensing information including the urban heat island (UHI) intensity index, the normalized difference vegetation index (NDVI), the normalized difference water index (NDWI), and the difference vegetation index (DVI) to analyze the correlation between the urban heat island effect and the spatial and temporal concentration distributions of atmospheric particulates in Beijing. The analysis establishes (1) a direct correlation between UHI and DVI; (2) an indirect correlation among UHI, NDWI and DVI; and (3) an indirect correlation among UHI, NDVI, and DVI. The results proved the existence of three correlation types with regional and seasonal effects and revealed an interesting correlation between UHI and DVI, that is, if UHI is below 0.1, then DVI increases with the increase in UHI, and vice versa. Also, DVI changes more with UHI in the two middle zones of Beijing. © 2013 Elsevier Ltd. All rights reserved.


Lu N.,The Environmental Protection Information Center | Cheng C.,Peking University | Zhu Q.,The Environmental Protection Information Center | Liu D.,The Environmental Protection Information Center | Yang Y.,The Environmental Protection Information Center
International Conference on Geoinformatics | Year: 2016

At present, China government's environmental protection work is partitioned according to job category, such as total amount control, environmental impact assessment, pollution control, environmental survey, supervising, and monitoring. It is unavoidable that the same pollution source management is divided into different aspects. And aiming at the same object, there will be numerous kinds of data which are different from each other. It is also very difficult to implementing cooperative. For environmental information's integrated management, this thesis researches how to efficiently integrate environmental information and realize effective information management, query and application. It will be provide powerful technical support for environmental management and comprehensive decision. According to environmental information's spatial properties, the thesis puts forward a set of information grid code schemes which meet the application requirements in environment protection field. Based on the code scheme, it also proposes data relevance and query method which will help to finding out how to manage environmental data in a unified way. The research finding may provide technical basis for unified planning and sharing of environmental information. © 2015 IEEE.


PubMed | Beijing Normal University and The Environmental Protection Information Center
Type: Journal Article | Journal: International journal of environmental research and public health | Year: 2014

As the land ecosystem provides the necessary basic material resources for human development, land ecological security (LES) plays an increasingly important role in sustainable development. Given the degradation of land ecological security under rapid urbanization and the urgent LES requirements of urban populations, a comprehensive evaluation method, named Double Land Ecological Security (DLES), has been introduced with the city of Guangzhou, China, as a case study, which evaluates the LES in regional and unit scales for reasonable and specific urban planning. In the evaluation process with this method, we have combined the material security with the spiritual security that is inevitably associated with LES. Some new coefficients of land-security supply/demand distribution and technology contribution for LES evaluation have also been introduced for different spatial scales, including the regional and the unit scales. The results for Guangzhou indicated that, temporally, the LES supply indices were 0.77, 0.84 and 0.77 in 2000, 2006 and 2009 respectively, while LES demand indices for the city increased in 2000, 2006 and 2009 from 0.57 to 0.95, which made the LES level decreased slowly in this period. Spatially, at the regional scale, the urban land ecological security (ULES) level decreased from 0.2 (marginal security) to -0.18 (marginal insecurity) as a whole; in unit scale, areas in the north and in parts of the east were relatively secure and the security area was shrinking with time, but the central and southern areas turned to be marginal insecurity, especially in 2006 and 2009. This study proposes that DLES evaluation should be conducted for targeted and efficient urban planning and management, which can reflect the LES level of study area in general and in detail.


Chang H.,Tsinghua University | Wu Z.-X.,Tsinghua University | Guo S.-Y.,The Environmental Protection Information Center | Yang X.-T.,Tsinghua University
Annals of Nuclear Energy | Year: 2015

An optimized process for tritium-containing waste water collection of Higherature Gas-cooled Reactor (HTGR) was developed and experimentally verified using the 10 MW Higherature Gas-cooled Reactor-test module (HTR-10). Compared with the previous process, an auxiliary molecular sieve bed was added in helium purification regeneration system and new operation process was proposed to collect tritium-containing waste water. In this paper, the optimized process and verification experiment were presented in detail. In commissioning experiment of the improved HTR-10, a large quantity of high-dose tritium-containing waste water was successfully collected in the water separator of helium purification regeneration system, with the specific activity being 6.1 × 109 Bq/L. The verification experiment confirms that the optimized process is effective and reliable for the demonstration plant design of High Temperature Gas-cooled Reactor-Pebble bed module (HTR-PM) to avoid the large emission of detrimentally radioactive waste water to the environment. © 2015 Elsevier Ltd. All rights reserved.


Wu X.,Fuzhou University | Cai W.,The Environmental Protection Information Center
2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2012 - Proceedings | Year: 2012

Environmental quality evaluation (EQE) is an important task of environmental protection. A large number of evaluation models have been developed for many environmental domains, such as water environmental quality of rivers, lakes and sea, air quality and environmental noise situation. Traditional EQE involves a complicate process which consists of data collection, data transmission, quality evaluation, evaluation result correction and publication, and it needs mass manual work. Along with people's more concerning with environmental status, it requires more powerful technique to accelerate the process of EQE. Hence all kinds of elements of EQE (data, environmental standard, evaluation method, human, etc.) need to be organized together to collaborate with each other. This paper presents an environmental quality evaluation and information service system to facilitate the EQE process, which utilizes grid computing technology to construct the basic IT infrastructure. The core functions such as data management, evaluation and information sharing are built as grid services to achieve more flexibility and extensibility. This system has been implemented and running in Sanming city of China and the effect is quite promising. © 2012 IEEE.


Zhang B.,The Environmental Protection Information Center | Qin Y.,The Environmental Protection Information Center | Huang M.,The Environmental Protection Information Center | Sun Q.,The Environmental Protection Information Center | And 3 more authors.
Computers and Geosciences | Year: 2011

System dynamics (SD) is well suited for studying dynamic nonlinear complex systems. In this paper, SD is applied to a rapid-onset water pollution accident using a 1-D water quality model and a conceptual GIS-SD framework is constructed to simulate the temporal-spatial changes of pollutant concentration. Based on the component GIS and the SD model, a prototype system of water quality simulation in water pollution accidents is developed. The data collected on the spot in the Songhua River water pollution accident in November 2005 were used for model parameter calibration and model validation. The results showed that: (1) the constructed model could simulate the changes of nitrobenzene concentration with time in the Songhua River water pollution accident, especially during the peak concentration and at the arrival time of peak concentration, and that the simulated values and the on-the-spot monitored values corresponded with each other well; (2) the scenario simulation could be made by adjusting parameters u (longitudinal current velocity), E (longitudinal diffusion coefficient), and k (decay rate coefficient). Such a model can provide decision makers with quantitative information to optimize related emergency response measures. © 2011.


Yang S.,The Environmental Protection Information Center | Zhang B.,The Environmental Protection Information Center | Li S.,The Environmental Protection Information Center | Yu C.,The Environmental Protection Information Center | Hao Q.,The Environmental Protection Information Center
Journal of Computational Information Systems | Year: 2014

In this paper, we propose a novel approach for keyword extraction. Different from previous keyword extraction methods, which identify keywords based on the document alone, this approach introduces Wikipedia knowledge and document genre to extract keywords from the document. Keyword extraction is accomplished by a classification model utilizing not only traditional word based features but also features based on Wikipedia knowledge and document genre. In our experiment, this novel keyword extraction approach outperforms previous models for keyword extraction in terms of precision-recall metric and breaks through the plateau previously reached in the field. © 2014 Binary Information Press.


Zhang B.,The Environmental Protection Information Center
Advanced Materials Research | Year: 2014

China is meeting many environmental challenges that threaten food safety and security but there are actions China may implement to improve this situation. Current impediments include continued population increase, rapid urbanization, and decrease in arable lands, water pollution and climate change. China should control the population, improve irrigation techniques, fight against water pollution and invest on education to facilitate a major transition in the development mode and strive for more sustainable consumption of natural resources. These actions will ensure China's self-sufficiency and prosperity. © (2014) Trans Tech Publications, Switzerland.


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