Soil erodibility is an important index to evaluate the soil sensitivity to erosion. The research on soil erodibility is a crucial tache in understanding the mechanism of soil erosion. Soil erodibility can be evaluated...Soil erodibility is an important index to evaluate the soil sensitivity to erosion. The research on soil erodibility is a crucial tache in understanding the mechanism of soil erosion. Soil erodibility can be evaluated by measuring soil physiochemical properties, scouring experiment, simulated rainfall experiment, plot experiment and wind tunnel experiment. We can use soil erosion model and nomogram to calculate soil erodibility. Many soil erodibility indices and formulae have been put forward. Soil erodibility is a complex concept, it is influenced by many factors, such as soil properties and human activities. Several obstacles restrict the research of soil erodibility. Firstly, the research on soil erodibility is mainly focused on farmland; Secondly, soil erodibility in different areas cannot be compared sufficiently; and thirdly, the research on soil erodibility in water-wind erosion is very scarce. In the prospective research, we should improve method to measure and calculate soil erodibility, strengthen the research on the mechanism of soil erodibility, and conduct research on soil erodibility by both water and wind agents.展开更多
The resin-matrix pantograph contact strip (RMPCS),which has excellent abrasion resistance with electrical current and friction-reducing function,was developed in view of the traditional contact strips with high mainte...The resin-matrix pantograph contact strip (RMPCS),which has excellent abrasion resistance with electrical current and friction-reducing function,was developed in view of the traditional contact strips with high maintenance cost,high wear rate with electrical current and severe damage to the copper conducting wire.The characteristics of worn surfaces,cross-section and typical elemental distributions of RMPCS were studied by scanning electron microscopy (SEM) and energy dispersion spectrometry (EDS).The wear behavior and arc discharge of RMPCS against copper were investigated with self-made electrical wear tester.The results show that the electrical current plays a critical role in determining the wear behavior,and the wear rate of the RMPCS against copper with electrical current is 2.7-5.8 times higher than the value without electrical current.The wear rate of the contact strip increases with the increase of the sliding speed and electrical current density.The main wear mechanism of RMPCS against copper without electrical current is low stress grain abrasive and slightly adhesive wear,while arc erosion wear and oxidation wear are the dominate mechanism with electrical current,which is accompanied by adhesive wear during the process of wear.展开更多
文摘Soil erodibility is an important index to evaluate the soil sensitivity to erosion. The research on soil erodibility is a crucial tache in understanding the mechanism of soil erosion. Soil erodibility can be evaluated by measuring soil physiochemical properties, scouring experiment, simulated rainfall experiment, plot experiment and wind tunnel experiment. We can use soil erosion model and nomogram to calculate soil erodibility. Many soil erodibility indices and formulae have been put forward. Soil erodibility is a complex concept, it is influenced by many factors, such as soil properties and human activities. Several obstacles restrict the research of soil erodibility. Firstly, the research on soil erodibility is mainly focused on farmland; Secondly, soil erodibility in different areas cannot be compared sufficiently; and thirdly, the research on soil erodibility in water-wind erosion is very scarce. In the prospective research, we should improve method to measure and calculate soil erodibility, strengthen the research on the mechanism of soil erodibility, and conduct research on soil erodibility by both water and wind agents.
基金Project (06FJ3041) supported by the Key Laboratory Open Foundation of Hunan Province, China
文摘The resin-matrix pantograph contact strip (RMPCS),which has excellent abrasion resistance with electrical current and friction-reducing function,was developed in view of the traditional contact strips with high maintenance cost,high wear rate with electrical current and severe damage to the copper conducting wire.The characteristics of worn surfaces,cross-section and typical elemental distributions of RMPCS were studied by scanning electron microscopy (SEM) and energy dispersion spectrometry (EDS).The wear behavior and arc discharge of RMPCS against copper were investigated with self-made electrical wear tester.The results show that the electrical current plays a critical role in determining the wear behavior,and the wear rate of the RMPCS against copper with electrical current is 2.7-5.8 times higher than the value without electrical current.The wear rate of the contact strip increases with the increase of the sliding speed and electrical current density.The main wear mechanism of RMPCS against copper without electrical current is low stress grain abrasive and slightly adhesive wear,while arc erosion wear and oxidation wear are the dominate mechanism with electrical current,which is accompanied by adhesive wear during the process of wear.
