Advanced Materials Research Vols. 986-987

Abstract: The supervision monitoring program of radiation environment around nuclear power plants is an important basis for the environmental radiation monitoring work. Key elements such as source, exposure pathway and representative person are discussed in the design of the supervision monitoring program, and technical details about the review of monitoring, evaluating and quality assurance are also given in this article. For the supervision monitoring work of radiation environment around nuclear power plants, it can provide some guidance about the review of the supervision monitoring program for nuclear safety regulators, and provide some reference about the design and revision of the supervision monitoring program for nuclear safety monitoring departments.

Abstract: In light of the increasingly prominent environmental problems and disputes of the power transmission transformation engineering, analysis many of the environmental impact of 500 kV power transmission transformation engineering, introduce the related standards of electromagnetic environmental impact, focusing on the analogy analysis and theoretical prediction for the electromagnetic environment around typical 500 kV power transmission transformation engineering , analysis the condition of the power frequency electromagnetic field and radio interference which generated by power transmission transformation engineering effects on the environment. put forward the countermeasures and technical measures to solve and alleviate the problem of environment .

Abstract: In this study, two different bed materials in media filter systems were examined. Natural zeolite has the ability to take up heavy metals (Cd, Zn) from acid mine drainage (AMD) as well as zero-valent iron (ZVI). The aim of the study was to estimate the ability to remove heavy metals of Natural zeolite and compare the efficiencies of the two media. A major purpose of this report was to determine which media would have a higher permeation rate after running a period of time. It was concluded that ZVI had a higher efficiency of taking up heavy metals (>96.5%) and a faster permeation rate which had a longer operating life.

Abstract: The application of selective catalytic reduction (SCR) system may affect mercury speciation in coal-combustion flue gas. The factors affecting mercury oxidation efficiency by SCR catalysts have been evaluated in this research. The influencing factors investigated included hydrogen chloride (HCl), sulfur dioxide (SO₂), ammonia (NH₃) injection rate and space velocity. HCl had been found to promote mercury oxidation significantly. The Eley-Rideal mechanism was proven to be suitable to explain the reaction of Hg⁰ and HCl. NH₃ injection had a strong negative effect to mercury oxidation. The deactivation of aged SCR catalysts was mainly due to loss of active sites.

Abstract: In a wetted-wall column of pilot-scale sulphur dioxide removal efficiencies were measured at 20°C and atmospheric pressure with aqueous ammonia solutions as the scrubbing liquid for different sulphur dioxide inlet concentration in the range of 1000-3000 mg/m³. A mathematical model with the effects of a chemical enhancement factor and sulfite concentration in the liquid phase developed to interpret laboratory experiments was adapted and the calculated values were in reasonable agreement with the experimental values. It appears that this model can provide good predictions of the absorption performances of industrial columns and be helpful to design scrubbers for SO₂ abatement with aqueous ammonia solutions.

Abstract: The purpose of this review paper is to summarize the recent research in mechanics behavior of hydrate bearing sediments (HBS). The paper will discuss recent research of the laboratories mechanics test with analysis on HBS and numerical simulation on mechanics behavior of HBS.

Abstract: The experience of shale gas low-cost development in America provided production organization and management methods including horizontal well drilling, cluster well drilling, pad drilling, batch drilling, factory drilling, and reservoir volume fracturing. The policy of finance and taxation has played a positive role in promoting and encouraging shale gas development. The development of shale gas in China is different from America in sides of resource features, development process, the technical levels and the policy environment. We should learn from the technical means, management method and encouraging fiscal and financial policy of low-cost development strategy of America, study and formulate policy suitable to China's own characteristics, to promote low-cost development of shale gas.

Abstract: Classification of Surrounding rock of roadway of Coal mine bolt supporting is the basis of bolting design, To scientifically design coal roadway bolting, classification of surrounding rock of coal roadway bolting must first be carry out. in this paper, the comprehensive application of knowledge engineering, rock mechanics, we developed the surrounding rock classification system for the bolt support of coal mine roadway engineering, the surrounding rock classification system is practical easy to use, the bolt supporting of roadway surrounding rock classification results to the coal mine roadway bolt support has important significance and practical value.

Abstract: Theoretical studies have shown that the generation of the hydraulic fractures reduces or even reverses the stress anisotropy near the fractures and results in increasing the complexity of fractures. A finite element model was established in which the pore pressure elements were used to simulate the behavior of porous media and the pore pressure cohesive elements were adopted to catch the characters of hydraulic fractures. A special fracturing manner was adopted to create complicated fracture networks by reducing or even reversing the stress anisotropy between fractures. The geometries of hydraulic fractures, strains, stresses, pore pressure distributions and fluid pressures within the fractures are obtained. The results of the model are fit well with the corresponding theoretical data. The simulation results show that the stress anisotropy is reduced by the generation of the hydraulic fractures, multiple parallel transverse fractures of horizontal well even reverse the stress anisotropy in some place of the reservoir. The simulation results validate the feasibility of the theoretical studies and the expected complex network fractures could be created by adopting special fracturing manner.

Abstract: Focusing on the architectural proper distribution problems with low energy consumption, this paper analyzes the architectural distribution model and builds the architectural landscape target location distribution model with pollution control consideration. According to the features of the architectural landscape pollution control, the paper analyzes the architectural landscape target location distribution model with differentiations and finds the optimal distribution with less pollution for the architectural landscapes. The Oealcle spatial is used to describe the relationship model of the vegetation objects in the landscapes in order to obtain the optimal distribution model for the architectures with differentiations. The simulation experiments illustrate the proposed model can appropriate distribute the architectural landscapes with differentiations with better pollution control effects.