A field experiment was carried out to assess the effects on heavy metals bioavailability of four different amendments: limestone, dolomite, fly ash, and compost and their combination in highly acidic soils. Jute as an...
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ISBN:
(纸本)9781845648572
A field experiment was carried out to assess the effects on heavy metals bioavailability of four different amendments: limestone, dolomite, fly ash, and compost and their combination in highly acidic soils. Jute as an economic plant, its metal uptake, growth, and yield of plants was investigated. The results showed that amendments can effectively fix the exchangeable heavy metals in the contaminated soil and reduce the heavy metal absorption in plants. Jute was failed to establish on the control, while it can grow well on the amendment treatments. Mixture of compost and limestone is the best treatment. Amendments do not change the total amount of heavy metal, but they help alter the p H in soil and improve its physical and chemical nature, and reduce the bio-efficiency of Cd, Cu, Pb and Zn in the multipolluted soils. They enhance the soil's natural attenuation mechanisms controlling metal mobility and bioavailability thus reducing to some extent the potential toxicity of metals to humans and the environment. However, as amendments do not affect the total amount of heavymetals, further and long-term monitoring process is needed to test the sustainability of their fixation efficiency.
Topological insulator,as a distinct state of matter,has drawn much attention *** behaves as an insulator in its interior but whose surface contains metallic gapless states.
Topological insulator,as a distinct state of matter,has drawn much attention *** behaves as an insulator in its interior but whose surface contains metallic gapless states.
Based on the transportation mode of high-speed trains and mid-speed trains operating on the same line, considering the delay time of different level trains influence the total late time differently and setting the dou...
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Based on the transportation mode of high-speed trains and mid-speed trains operating on the same line, considering the delay time of different level trains influence the total late time differently and setting the double control parameters, the mathematical model of the train traffic control is built. According to the theory of genetic algorithm, the sectionalized structural optimization for chromosome coding is designed; model of solution algorithms is established. Using the adjusting algorithm based on genetic algorithm, a simulation system which was fit for the train traffic control of passenger dedicated railway is designed and by simulating the operation adjustment matter in an area of WuHan-GuangZhou passenger dedicated railway where it was from WuChang to YueYang, the feasibility of this method has been verified successfully.
Based on the transportation mode of high-speed trains and mid-speed trains operating on the same line, considering the delay time of different level trains influence the total late time differently and setting the dou...
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With the development of wind power technology, the wind farm becomes a large station in which many kinds of devices are. These devices are from different companies having their own monitoring systems, so it is hard to...
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In order to reveal deformation laws of anchored rock under long-term loads, in this paper, creep mechanical characteristics of anchored rock are analyzed, and anchorage constitutive model considering time effect is in...
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In the present work, the mechanical properties of 321 stainless steel pressure equipments exposed to an accident fire in a chemical unit were investigated. The performance and microstructure of this material were desc...
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In the present work, the mechanical properties of 321 stainless steel pressure equipments exposed to an accident fire in a chemical unit were investigated. The performance and microstructure of this material were described by chemical compositions analysis, tensile test, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The experiment results showed that the mechanical properties of the material were degraded. The grains on the external surface of the fracture became coarse. These results indicated that serious damage to 321 stainless steel had been induced by extreme heat of the fire and this pressure vessel could not be used anymore.
Carbon-based ion optics have the potential to significantly increase the lifetime of state-of-the-art ion thrusters which use molybdenum optics because of the lower sputter yield and greater packing density of the car...
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