Applied Mechanics and Materials Vols. 675-677

Abstract: Measure content of fresh tailing sand in a certain skarn type copper mine selection tailing sand warehouse, lead, cadmium, arsenic, nickel and zinc elements, etc in old tailing sand by ICP-AES. Carry out eluviations test of tailing sand and leaching test of tailing sand by horizontal vibration method and Sulphuric-Nitric acid method respectively. Discuss with phase constitution of harmful elements such as arsenic in tailing sand by XRD analysis chromatogram of tailing sand. Compare with content analysis result and mineral constitution of related elements in raw mine on the basis. Research migration and distribution disciplines of associated harmful elements in raw mine to tailing sand by floatation. Test result shows that arsenic, zinc, cadmium and lead elements in raw mine deeply concentrated in tailing sand after mine selection. Percentage is 96.89%, 92.0%, 91.65% and 41.12% respectively. Main existence form of As in tailing sand is FeAsS (arsenopyrite). It intergrowth with pyrite (FeS₂); Zn mainly exists in a ZnS (sphalerite) form. Pb, Cd and As have migration trend from upstream to downstream of tailing sand warehouse and from shallow layer to deep layer. Dissolution rate of Cd, Cu, Zn, Cr and Pb under eluviation and weak acid leaching conditions is lower. However, they have release trend under acid conditions. Arsenic element is special as follows: It is undetected in various points during Sulphuric-Nitric digestion. However, tiny detection of fresh surface layer and deposit layer out of old tailing sand by horizontal vibration method prompts stability of arsenic tailing sand FeAsS and alarm of leaching activity under alkaline conditions. Cause of arsenic tailing sand FeAsS is that it is brought by raw mine without large destruction to FeAsS during mine selection process.

Abstract: Potentials of three plant species, rape, alfalfa and white clover, separately or jointly on the degradation of polycyclic aromatic hydrocarbons (PAHs) in soil were estimated by pots experiments. Results showed the presence of vegetation apparently enhanced the dissipation of PAHs at initial concentrations ranging from 20.05 to 322.06 mg·kg-1. Within 70-day experiment, alfalfa and white clover showed higher efficiencies for removal of PAHs than those of rape, and mixed cropping greatly enhanced the dissipation of PAHs as compared to single cropping. On average 74.87% of phenanthrene or 62.81% of pyrene were removed from soils with mixed cropping of rape and alfalfa, and 72.01% of phenanthren or 68.44% of pyrene removed by mixed cropping of rape and white clover. Results suggested a feasibility of the establishment of multispecies remediation for enforcing the dissipation of PAHs.

Abstract: Iron plaque is portal of the pollutants into the plant body and plays an important role in reducing pollutants. A pot experiment was conducted to investigate the formation of iron plaque, and lead accumulation and distribution in Carex cinerascens. The data showed that the amounts of iron plaque increased with Fe additions. Under the condition of 0 —100 mg kg^-1 lead concentration for Poyang Lake wetland soil, it was the most beneficial condition for the formation of iron plaque when iron concentration was 500 mg kg^-1. There was a significantly correlation between the concentrations of Fe and Pb in iron plaque on the root surfaces of Carex cinerascens (r=0.68). Most of the lead accumulated in the roots of Carex cinerascens, a few of lead accumulated in the shoots of Carex cinerascens. Iron plaque promoted the migration of lead from soil to roots, it played a role to eliminate heavy metals pollution of Poyang Lake wetland soil to some extent.

Abstract: Space effectiveness is to measure the effectiveness from the perspective of spatial structure. The space effectiveness of urban natural ecological network affects the urban natural ecological environment directly. Accessibility, liquidity, and supportiveness of "network-like" structure are key factors to the space effectiveness. Therefore, the key to optimize space effectiveness of natural ecological network is to maintain the space support structure that affects key effectiveness factors.

Abstract: The current agricultural development mode has changed from the traditional mode to circular agriculture mode. The circular agriculture is the inevitable request to realize the sustainable development of agricultural production. Thus we should make full use of existing resources and science and technology to serve for the circular agriculture. To grasp the role of the information service, the paper analyze the use of information technology in every link of circular agriculture.

Abstract: Based on basic ecological and entrepreneurial theory, the purpose of this study was to explore the coordination between specifics in entrepreneurship system. A survey study was conducted to collect data from 362 effective entrepreneurs. The result of this research implied that coordination between enterprises and government, research institutes, and risk investment affected growth performance significantly; however, coordination between enterprises and government done not affect profit performance. Meanwhile, coordination between enterprises and research institute and risk investment affected growth performance more than profit performance. Therefore, we should be considering adding some index of profit performance and promoting the identification ability of project in the late stage of policy implementation. At the same time, the entrepreneurial enterprises should find a stable cash flow to realize the fast development,and reduce the risk of capital operation and increase market liquidity in the largest degree.

Abstract: New urbanization construction inevitably results in some environmental problems which have negative impact on the development of rural economy and social development. Therefore, we should pay attention to environmental protection in the course of urbanization. This article mainly studies the development prospect of new urbanization concerning “developing the ecological economy and improving the urban environment quality”, “ensuring the ecological protection and practicing economy”, “promoting the development of circular economy in the course of urbanization construction” and “strengthening the ecological environment monitoring and information management”. Then propose some suggestions to the environmental protection of new urbanization construction.

Abstract: Farmland has important ecological service value. Underestimating the added value is one of the reasons of extensive land use. From the view of ecological protection and sustainable development, this paper discusses the ecological function of farmland and assesses its ecological value by using statistical methods. Taking Shaoxing county of Zhejiang province as an example, the study analyzes the necessity of ecological compensation based on the investigation of land uses current situation and land acquisition compensation level. The compensation system in land acquisition should be improved in the aspects of institution, concept and policy.

Abstract: This paper invest environmental science and practice of the Beijing Olympics through literature research, expert interviews, case studies and fields surveys and other methods, while referring to other environmental protection of major sports events, study environment questions in major sports events, and explore patterns of major sports events environmental protection. We suggest that hosting major sports events will bring ecological and environmental problems of air pollution, water pollution, and other pollution. We need to establish the concept of sustainable development of protecting environment and maintaining ecological balance in the process of organizing large-scale sporting event, and after the game .At the same time, to develop environmental events planning, implementation, monitoring mechanisms, rational planning of venue construction, improve the utilization of the venue after the game. We should make full use of environmentally friendly energy-saving technology, strengthen the host city for environmental pollution control.

Abstract: Thoreau was an American famous writer, Walden was his masterpiece, recorded Thoreau’s attitude towards nature, this paper analysis the background of Thoreau, and Walden, give guidance on our environmental protection.