The Study of Environmental Effects of Exploitation and Utilization of Shallow Geothermal Energy in Zhengzhou
P. Yang, X. J. Guo, G. B. Zhang, X. Feng, Y. Tian, H. Z. Liu
Issue: 105, Pages: 1-4, Article No: e105001, Year: 2018
[Abstract]
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[References]
ABSTRACT
Through the survey and monitoring of the existing projects for g shallow geothermal energy exploitation and utilization in Zhengzhou and identification of shallow geothermal energy utilization,the paper studied the effects of the shallow geothermal energy utilization on the geological environment, such as groundwater temperature, groundwater quality, microbial,etc, and prevention measures are put forward.
Keywords: shallow geothermal energy, ground source heat pump,water tempreture,water quality, total bacterial count
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Ecological Risk Assessment of Guangxi Xijiang River Basin based on Landscape Pattern
Y. Yan, S. N. Shi, B. Q. Hu, K.S. Yang
Issue: 105, Pages: 5-16, Article No: e105002, Year: 2018
[Abstract]
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[References]
ABSTRACT
As the emerging national strategy, the Xijiang river basin is facing stress from the accelerated and intensified exploitation, and resulted in environment deterioration and ecological risks. So, it is urgent to conduct the risk assessment of the river basin to balance the economic development and environmental protection. The ecological risk assessment was carried out at landscape level by applying the ecological risk model developed from landscape indices and land use data (1990s, 2000s, and 2010s). The ecological risk model was proposed based on landscape hemeroby index and landscape vulnerability index. Then, the exponential model was used to perform the kriging interpolation. The results indicated that: 1) The ecological risk of the study area presented deteriorative trend since the LERI value was stable from 1990s to 2000s, yet increased markedly in 2010s. 2) The dominate factor for the spatial variation of the ecological risk in the study area was non-structural stochastic factors in small scale rather than the structural factors in large scale. The high and very high risk level was mainly distributed in the northern, northwestern and eastern part of the basin and the very low and low risk level spread in the center of the study area. 3) The ecological risk presented deteriorated tendency from 1990s to 2010s, with the very high risk level reached up to 32.55% and the high risk level 25.37% in 2010s. The very high ecological risk for the six land use types all increased in the course of the study period and the area proportion for very low and low level ecological risk all declined without exception.
Keywords: spatial analysis, landscape metrics, risk transformation, spatial and temporal change
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Preparation and Antioxidant Activity of Phosphorylated Polysaccharides from Russula Alutacea Fr.
Yan Zhao, Xiaoning Li, Ting Chen, Qinyan Tang, Lianying Qiu, Baijuan Wang, Qingsong Yang
Issue: 105, Pages: 17-22, Article No: e105003, Year: 2018
[Abstract]
Full Text: (PDF)
[References]
ABSTRACT
As a large amount of alkali-soluble polysaccharides is present in Russula alutacea Fr., their insolubility limits their application. Chemical modification can improve the solubility of natural polysaccharides to enhance their activities, and enlarge their application range. In this study, water-soluble polysaccharides of Russula alutacea Fr. were modified by phosphoric-acid esterification reaction. The antioxidant activity and structural properties of modified and unmodified polysaccharides were measured. The scavenging ability of hydroxyl radical, superoxide anion and DPPH radical scavenging were analyzed and the properties of the modified and unmodified polysaccharides comprehensively compared. The results showed that antioxidant activity of the phosphorylated polysaccharides was higher than that of unmodified polysaccharides from Russula alutacea Fr.
Keywords: Russula alutacea Fr., polysaccharides, antioxidation, reducibility
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