The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
Zhenxiang Xing - One of the best experts on this subject based on the ideXlab platform.
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Health assessment and spatial variability analysis of the Naolihe Basin using a Water-Based System
Ecological Indicators, 2018Co-Authors: Zhenxiang Xing, Yinan WangAbstract:Abstract To determine the spatial distribution and variability in the health status of the Naolihe Basin, a Water-Based System was introduced, and 27 indexes were selected within the Water-Based System theoretical frame. The Naolihe watershed was divided into 12 subareas, and the health status of each subarea was evaluated using a fuzzy comprehensive evaluation method with weightings calculated using an improved combined entropy-weighting method and analytic hierarchy process. Three semi-variability models (spherical, exponential, and Gaussian) for the Kriging interpolation method were used to analyze the spatial variability of the basin’s health status. The Kriging interpolation method with the Gaussian model delivered the highest accuracy. Spatial variability analysis showed that the health status of the Naolihe Basin was mainly affected by river direction, topography, and regional economic development level. The health state of the southern area of the Naolihe River was better than that of the northern area, and the health state gradually improved from east to west in the Naolihe Basin. In addition, the health statuses of several specific areas were slightly lower, which was caused by overdevelopment.
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CCTA - The Catchment Water-Based System Health Evaluation Based on the TOPSIS Model
Computer and Computing Technologies in Agriculture VIII, 2015Co-Authors: Zhenxiang Xing, Meixin Liu, Hao GuoAbstract:The health status of Naolihe Basin has already varied significantly affected by the climate change and human activity. Therefore, it is reasonably much important to analyze and evaluate the health status of river, which could provide basis for the comprehensive development and protection in the Naolihe Basin. So, this paper takes Baoqing country as the study region, uses the stable state, the harmonious degree and evolution rate to describe the health status, and establishes the health evaluation index System of Water-Based System in Baoqing country based on the concept of Water-Based System. The entropy method is used to the weight vector of steady state index and harmonious degree index, the TOPSIS was applied to analysis the health status of Water-Based System of Baoqing country during 2005 to 2009. The comprehensive evaluation result shows that the Water-Based System of Baoqing country is in the state of comparative healthy, the main reason is that water resources of the study area are relatively insufficient, and drinking water security and water consumption cannot obtain the complete guarantee, which leads to lower steady state.
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The Catchment Water-Based System Health Evaluation Based on the TOPSIS Model
2014Co-Authors: Zhenxiang Xing, Meixin Liu, Hao GuoAbstract:The health status of Naolihe Basin has already varied significantly affected by the climate change and human activity. Therefore, it is reasonably much important to analyze and evaluate the health status of river, which could provide basis for the comprehensive development and protection in the Naolihe Basin. So, this paper takes Baoqing country as the study region, uses the stable state, the harmonious degree and evolution rate to describe the health status, and establishes the health evaluation index System of Water-Based System in Baoqing country based on the concept of Water-Based System. The entropy method is used to the weight vector of steady state index and harmonious degree index, the TOPSIS was applied to analysis the health status of Water-Based System of Baoqing country during 2005 to 2009. The comprehensive evaluation result shows that the Water-Based System of Baoqing country is in the state of comparative healthy, the main reason is that water resources of the study area are relatively insufficient, and drinking water security and water consumption cannot obtain the complete guarantee, which leads to lower steady state.
Pramuan Tangboriboonrat - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of natural rubber film by polymerisation of methyl methacrylate in Water-Based System
European Polymer Journal, 2006Co-Authors: Kittiporn Sanguansap, Rattaporn Thonggoom, Pramuan TangboriboonratAbstract:Polymerisation of methyl methacrylate (MMA) on the surface of natural rubber (NR) film was studied in order to increase the surface hardness, roughness and, hence, to decrease the friction coefficient of rubber. We used the two-step process: (i) swelling of MMA and tert-butyl hydroperoxide, emulsified in an aqueous solution of sodium dodecyl sulphate, onto the NR film surface, and (ii) subsequently immersing the swollen rubber strip into an alkaline aqueous solution of ferrous ion/fructose for redox initiation. The presence of PMMA on the NR surface was examined by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). Increasing the concentration of ferrous ion caused an increase in MMA conversion. The surface morphology observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) in tapping mode revealed the aggregation of micronmetre-scale nodules on the modified surface. The surface hardness and roughness increased with increasing PMMA content.
Xiwang Zhang - One of the best experts on this subject based on the ideXlab platform.
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water based synthesis of zeolitic imidazolate framework 8 with high morphology level at room temperature
RSC Advances, 2015Co-Authors: Meipeng Jian, Bao Liu, Ruiping Liu, Huanting Wang, Xiwang ZhangAbstract:In this study, the synthesis of zeolitic imidazole framework (ZIF-8) in water was Systematically studied using 6 zinc sources (Zn(OAc)2, ZnSO4, Zn(NO3)2, ZnCl2, ZnBr2, ZnI2), respectively, under different conditions at room temperature without using any additives. It was found that Zn(OAc)2 is the best precursor and the resultant ZIF-8 particles have the best quality with rhombic dodecahedron morphology. The concentration of 2-methylimidazole (Hmim), molar ratio Hmim/Zn and water content all have significant impacts on the morphology, particle size, and crystallinity of ZIF-8. Further result analysis reveals that 3 key reactions are involved in the ZIF-8 formation which needs five steps in ZIF-8 structural evolution. This study provides a deep understanding of the crystallization process of ZIF-8 particles in a Water-Based System.
Kittiporn Sanguansap - One of the best experts on this subject based on the ideXlab platform.
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Surface modification of natural rubber film by polymerisation of methyl methacrylate in Water-Based System
European Polymer Journal, 2006Co-Authors: Kittiporn Sanguansap, Rattaporn Thonggoom, Pramuan TangboriboonratAbstract:Polymerisation of methyl methacrylate (MMA) on the surface of natural rubber (NR) film was studied in order to increase the surface hardness, roughness and, hence, to decrease the friction coefficient of rubber. We used the two-step process: (i) swelling of MMA and tert-butyl hydroperoxide, emulsified in an aqueous solution of sodium dodecyl sulphate, onto the NR film surface, and (ii) subsequently immersing the swollen rubber strip into an alkaline aqueous solution of ferrous ion/fructose for redox initiation. The presence of PMMA on the NR surface was examined by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). Increasing the concentration of ferrous ion caused an increase in MMA conversion. The surface morphology observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) in tapping mode revealed the aggregation of micronmetre-scale nodules on the modified surface. The surface hardness and roughness increased with increasing PMMA content.
Meipeng Jian - One of the best experts on this subject based on the ideXlab platform.
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water based synthesis of zeolitic imidazolate framework 8 with high morphology level at room temperature
RSC Advances, 2015Co-Authors: Meipeng Jian, Bao Liu, Ruiping Liu, Huanting Wang, Xiwang ZhangAbstract:In this study, the synthesis of zeolitic imidazole framework (ZIF-8) in water was Systematically studied using 6 zinc sources (Zn(OAc)2, ZnSO4, Zn(NO3)2, ZnCl2, ZnBr2, ZnI2), respectively, under different conditions at room temperature without using any additives. It was found that Zn(OAc)2 is the best precursor and the resultant ZIF-8 particles have the best quality with rhombic dodecahedron morphology. The concentration of 2-methylimidazole (Hmim), molar ratio Hmim/Zn and water content all have significant impacts on the morphology, particle size, and crystallinity of ZIF-8. Further result analysis reveals that 3 key reactions are involved in the ZIF-8 formation which needs five steps in ZIF-8 structural evolution. This study provides a deep understanding of the crystallization process of ZIF-8 particles in a Water-Based System.
