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Xu, Feng
- Research on Spatial Correlation Between Air Quality and Land Use Based on GWR Models
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PDF Views:0
Authors
Feng Xu
1
Affiliations
1 City Institute, Dalian University of Technology, Liaoning, Dalian 116600, CN
1 City Institute, Dalian University of Technology, Liaoning, Dalian 116600, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 1 (2017), Pagination: 155-161Abstract
Air quality has the strong regional characteristics, and the land use type can reflect human activities in the area to some extent. In order to explore the spatial relationships between air quality indicators (PM2.5, PM10, O3, SO2, NO2, CO) and land use indicators ( tree, grass, farm, water and building proportion), the ordinary least squares (OLS) and geographically weighted regression (GWR) models are established and tested by comparing R2 and AICc (Akaika Information Criterion corrected) of the models. The Moran's I statistics on the residuals from OLS and GWR models shows that the GWR models can be a good deal with the spatial autocorrelation. Meanwhile local parameters at different locations from GWR models can be good performance in the spatial heterogeneity of the air quality and land use, providing a scientific basis for rational and effective regional governance.Keywords
Air Quality, Land Use, Spatial Autocorrelation, Geographically Weighted, Regression (GWR).References
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- Effect of Confining Pressure on the Mechanical Properties of Thermally Treated Sandstone
Abstract Views :274 |
PDF Views:87
Authors
Affiliations
1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, CN
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, CN
2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
Source
Current Science, Vol 112, No 06 (2017), Pagination: 1101-1106Abstract
To understand the effect of confining pressure on the mechanical properties of thermally treated coarse sandstone, uniaxial and triaxial compression tests were conducted for six groups of thermally treated sandstone from Xujiahe Formation in southwestern China under confining pressures of 0-40 MPa. The test results indicate that 600°C is a critical threshold of the thermal damage of sandstone by SEM and mechanical tests. When temperature is below 600°C, few micro cracks are observed by SEM. Peak strength, elastic modulus, cohesion and internal friction angle remain constant or increase with increasing temperature and all these values decrease when temperature is above or equal to 600°C under different confining pressures. Under the uniaxial and low confining pressure (≤ 5 MPa), the failure mode shows single or multiple splitting planes and it is easier to generate complex cracks with increasing temperature. Under high confining pressure (10-40 MPa), the failure mode shows a simple shear plane after treatment at different temperatures, i.e. 25-1000°C. The results may provide guidance for rock engineering design after high temperature exposure.References
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- Effect of the Drilling Fluid on Hardness Characteristics of Tight Sandstone
Abstract Views :244 |
PDF Views:70
Authors
Affiliations
1 National and Local Joint Engineering Laboratory for Road Engineering and Technology in Mountainous Areas, Chongqing, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, CN
1 National and Local Joint Engineering Laboratory for Road Engineering and Technology in Mountainous Areas, Chongqing, CN
2 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, CN
Source
Current Science, Vol 115, No 11 (2018), Pagination: 2015-2018Abstract
To understand the effect of the drilling fluid on hardness characteristics of tight sandstone, indentation hardness tests were conducted on tight sandstone which were soaked in a water- or oil-based drilling fluid at different temperatures and time. The results of the study indicate that: (1) the hardness of tight sandstone decreased rapidly after being soaked in the water-based or oil-based drilling fluid and it decreased by 22.9% and 10.1% respectively after two hours; (2) with the increase in soaking time, the hardness remained almost constant when soaked in the oil-based drilling fluid. However, the reduction in hardness reached 33.1% after soaking in the water-based drilling fluid for 15 days; (3) there was little change in the hardness with the increase in temperature in the oil-based drilling fluid, but in the water-based drilling fluid, the hardness decreased at a temperature above 50°C; (4) high temperature would cause mineral expansion and hydration, resulting in hardness reduction with increase in soaking time in the water-based drilling fluid which would lead to the softening of the tight sandstone’s surface structure.References
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