Applied Mechanics and Materials Vols. 448-453

Abstract: The modeling theory to railway noise is applied and made a noise reduction system for the first time in this paper. Through test and analysis, the sound barriers and train skirts with better performance were selected to form a comprehensive denoise system. The performance of T-type sound barriers works better than straight-type; with the comprehensive denoise system, the railway noise in the simulative boundary alongside railway line and acoustic environment functional area II decrease by 9.24 dB(A) and 8.40 dB(A), respectively. In terms of energy, sound energy decline to 11.8% and 14.4%, separately; after installing the comprehensive denoise system, the day-time noise of all the points in acoustic environment functional area II reach the limits; as to the night-time noise, 75% points reach the national standard limits.

Abstract: The concentrations and fractionation of 14 rare earth elements (REEs) such as La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in filtered water, suspended particles and surface sediments at 10 sampling sites from Gansu, Ningxia and Inner Mongolia sections of the Yellow River of China were studied by HR-ICP-MS. The results demonstrated that the total concentrations of REEs (REEs) in filtered water varied from 0.017 to 0.079 μg/L and had high concentration at S3 (0.079), S1 (0.070) and S4 (0.063) in Inner Mongolia section, while in suspended particles and surface sediments, the ranges were 148.9-246.8 mg/kg (mean 176.4) and 109.9-252.0 mg/kg (mean 179.9), respectively, and showed high concentration at S9 (246.8), S7 (252.0), S8 (229.8) in Baiyin (Gansu section) and S1 (209.5) in Baotou (Inner Mongolia section). The ratios of L/H, δEu and δCe in suspended particles and surface sediments implied light-REEs enrichment in the water compared with the background value of Chinese soil. And the chondrite-normalized REEs patterns of the suspended particles and surface sediments also showed light REEs enrichment at S1, S7, S8 and S9. The high concentrations of REEs in the Yellow River were probably due to the weathering of soil and anthropogenic activities near the river.

Abstract: In this research, the UV absorbance values of wavelength at 210 and 254 nm, excitation emission fluorescent matrix were measured for source water and treated water in CCL (Cheng Ching Lake) water treatment plant during five months. The whole data produced from EEFM was analyzed by PARAFAC operated in MATLAB software. The variation of molecular weight for organic matter was measured by HPLC (high performance liquid chromatography) with UV and fluorescent detectors. Observed from the variation of UV210/UV254, high value in treated water compared with source water was found. More molecular weight less than 5 k Da was formed in the treated water with relative to source water. Also, both major components in source water were located at wavelengths of excitation/emission of 250/410 nm and 230/330 nm and those in treated water were 240/410 nm and 220/290 nm. Also, the fluorescent intensity, long excitation wavelength was higher than short excitation wavelength in source water. This phenomena was opposite with treated water.

Abstract: Measuring the Cooling Tower Noise by Standard Method, Analyzing the Radiation Noise Spectrum Characteristics, this Paper Carried on Full Analysis in the Principle and Control Methods. Noise Emission Meets the Standards and Showing Remarkable Economic Benefits and Social Benefits.Cooling Towers in Hotels, Shopping Malls, Office Buildings and so on were Usually Installed on the Roof or Deck. when they were Run, the Motor, the Fan and Dropping Water Produced Noise, which Diffused through the Air or Solid Conduction, Polluting the Environment.

Abstract: The power frequency electric field and Electric radiation generated by high voltage transmission line have a great impact on the surrounding environment, which is one of the important research topic on environmental protection and electromagnetic compatibility technology field. In this paper, the information database of typical transmission line and tower established,and the prediction of power frequency electric field intensity of high voltage transmission line has been given by using the 3-D computational method.Then, the major factors affecting the calculation results of electric field is discussed based on the measured data and the error analysis is given.

Abstract: The Three Gorge Project (TGP) is one of the largest hydraulic projects in the world, because of its super-huge style and complex function, the TGP exerts far-reaching and profound impacts. As while as beneficial effects, the TGP also brings bad influences. The main negative environmental influences of TGP are the impacts on the aquatic life, the estuary, the water blooms, the greenhouse gases and the relationships between the lakes and the Yangtze River. As the TGP has distinct features of temporal and spatial variation, it is important to monitoring the influences water resources in timely. In order to give the negative influence effective control, This paper mainly introduces eco-environmental monitoring system based on the Internet of Things (IoT). The system watches and grasps the change of the eco-environmental factors affected by TGP, especially those major environmental factors and seriously affected areas. It provides scientific basis for the ecological impacts caused by the TGP. The Three Gorges monitoring system based on the IoT is of great significance.

Abstract: Dust samples of gasoline and disruptors combustion were analyzed by GC-MS/MS. The use of GC-MS/MS determination in the SRM mode, provided the unequivocal identification of the target analytes. The results show that in the gasoline combustion dust samples containing mainly fluorene, phenanthrene, anthracene, fluoranthene, pyrene and other PAHs. GC-MS/MS is an invaluable analytical technique in suspected arson cases.

Abstract: This paper analyses the microstructure of different types of particles in PM₁₀ in Beijing-Tianjin-Tangshan urban agglomeration atmosphere in spring and summer by using field emission scanning electron microscopy (FESEM), in which the distribution characteristics of the size and number of the different types of particles in PM₁₀ are specifically analyzed by using image analysis software. The research result shows that the types of particles in Beijing-Tianjin-Tangshan urban agglomeration atmosphere are unknown particles, soot aggregates, mineral particles and spherical particles. According to the proportion of the three partials in the atmosphere, the three cities ranks as follows: in the aspect of unknown particles, Tianjin ranks first, which is followed by Tangshan and Beijing; in the aspect of soot aggregates, Tangshan ranks first ,which is followed by Beijing and Tianjin; in the aspect of mineral particles, Beijing ranks first ,which is followed by Tangshan and Tianjin; in the aspect of spherical particles, Beijing ranks first ,which is followed by Tangshan and Tianjin;

Abstract: On the basis of the daily air pollution index (API), primary pollutant, air quality level and status in Cangzhou from January 2009 to December 2012, the variation characteristics of air quality were analyzed. The results showed that API presented obvious seasonal variations with the highest value in winter and the lowest value in summer. PM₁₀ was the principal pollutant and accounted for 63% of the whole period. The percentage of excellent and good air quality was 93% during the period. The relationship between API and meteorological factors indicated that API was negatively correlated with temperature and relative humidity, but was not obvious correlation with air pressure and wind speed. The cluster analysis of backward trajectories showed that different types of air masses contribution to the API level showed some differences in different seasons. The north air mass in fall and northwest air mass in summer had the lowest contribution to the API level; while the local source could lead to the highest API level in winter suggesting that the heating and adverse weather conditions in winter may be the main cause of high API.

Abstract: In order to establish and improve the radiation environment monitoring standard system, to provide technical support for the radiation environment monitoring system, this work first retrieve the radiation environment monitoring standards, and clear the domestic status of the radiation environment monitoring standards. According to environmental Protection Department of the relevant documents and other relevant information, the radiation environment monitoring standards and methods have been accessed , to find the missing items and issues proposed revision of the system requirements. Summarizing radiation environment monitoring national standards, standards of environmental protection industry, the nuclear industry standard, there are 28 standard missing items need to the health industry standards, inspection and quarantine industry standards, a total of 145 of these standards of environmental radiation monitoring, radiation monitoring of pollution sources, emergency response and early warning and monitoring from a management and technology meet the basic needs of the radiation environment monitoring. Research found that the standards in the revised 57 and in the formulation of 47, develop. After the revision of China's standards system will be further improved. The radiation environment monitoring work will be further strengthened.