Advanced Materials Research Vols. 518-523

Abstract: Abstract. The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) and surface sediment properties were analyzed from 31 locations in Dapeng Bay and neighboring rivers (Kaoping River, Tungkang River and Lingbeng River), southern Taiwan. Principal component factor analysis (PCFA) was performed to explain the latent factors and spatial variations of sediment quality. And canonical discriminant analysis (CDA) was applied to identify the source of pollution of Dapeng Bay from neighboring rivers. The results show that the most important latent factors in Dapeng Bay and neighboring rivers on wet seasons are the soil texture caused factor, the PAHs caused factor, and the nutrient caused factor. Contour maps incorporating the factor scores showed phenanthrene (Phn) and pyrene (Pyr) of PAHs had the highest content at the entrance of the northern side of the lagoon. Benzo(a)pyrene (BaP) had the highest content located in mid-section of the Kaoping River and in Dapeng Bay. Total nitrogen (TN) and total phosphate (TP) had the highest content located in the last-section of Tungkang River. And CDA shows that sediment quality in Dapeng Bay was not similar to the other three rivers.

Abstract: This study simulated nitrogen release from different types of urban lakes, including South Lake and two sub-lakes of East Lake, Guozheng Lake and Miao Lake. The results showed that nitrogen release from the sediments of different polluted lakes under anaerobic conditions. It is necessary to maintain dissolved oxygen at a high level to suppress the nitrogen release. Under anaerobic conditions, higher temperatures can significantly improve the release of total nitrogen and ammonia in different types of lakes, but the promoting effect is different. The higher concentration gradient between sediments and overlying water, the greater release will happen. Ammonia has large contribution to the total nitrogen in all types of lakes. Reducing ammonia nitrogen is effective to control nitrogen release in the lake.

Abstract: The urban agglomeration is the area with industrial centralization, dense population and vehicles collecting, which is the heavily air polluted place but also the place with demand of hi-quality atmosphere. The only condition to assure the city clusters in sustainable development is that the economy and the environment shall be advanced in coordination, i.e. the economy shall be kept fast developing while the air quality shall satisfy the citizen’s healthy existence and the biologic balance. The basic measure to realize such condition is to control the total amount of pollutants discharged not exceed the atmospheric environmental capacity(AEC) ,in short, implementing the capacity total quantity control(CTQC).so calculate the value of atmospheric environmental capacity is very important. On account that this thesis has considered comprehensively the relations among ambient air quality to come up to national ambient air quality standard(NAAQS), the investment for controlling the pollution and the loss by contamination hazard, an optimized atmospheric environmental capacity model is established with the bi-objective functions of least investment for controlling the pollution and loss by contamination hazard as well as the restricting condition is atmospheric environmental quality meet the NAAQS. Taking the northern urban agglomeration in Leshan City as an example we have calculated the actual SO₂ atmospheric environmental capacity and provided an instance for the model’s promotion of application.

Abstract: Since 1988, great changes of primary production, pollutants loading, coastline and sea area have happened in the Bohai Sea in China. These environmental changes increased the value of marine ecosystem services value from 529.42 billion RMB in 1988 to 558.83 billion RMB in 2010. The ecosystem services values of recreation, food and materials production, O2 supply, climate regulation and primary productivity were raised. However, other marine ecosystem services value, including biological control, pollutant purification, knowledge broaden and biodiversity protection were lowered. In addition, value of ecosystem services increased in Liaodong Bay and Bohai Bay, but decreased in middle Bohai and Bohai strait, and it no change in Laizhou Bay,.This spatial difference of ecosystem service function value was mainly caused by the change of recreation function, O2 supply function and climate regulation function.

Abstract: The mechanism of fire induced by methane explosions was studied to know about the great danger of induced fire. Firstly, from the point of heat ignition to study it, then the especial heat environment after explosions was studied. Lastly, from the point of characteristics of gas separated from fuel to judge whether fire to be induced. The part of heat ignition was based on conservation of energy. And the special heat environment was studied by using CFD software Fluent to do some numerical simulation. As to gas separated from fuel, mainly from three aspects to discuss it: yields of gas and relating conversion, diffusion velocity, minimum combustion supporting oxygen concentration. And the research shows that, if the gas separated out from fuel could diffuse to satisfy the minimum combustion limit before the temperature of environment reduce to its fire induced temperature, and there is enough oxygen, sub-fire could be induced. This research could provide some technique support to prevent and cure such kind of accident, and has great significance.

Abstract: In view of the complexity, redundancy and uncertainty of measuring data generated by mine environment monitoring systems, a structure of two level data fusion, an adaptive weighted first level fusion and a second level fusion of grey correlation analysis, is presented, thus to achieve the fusion for the monitoring data from heterogeneous data sources and the fusion for the data from heterogeneous sources. Application examples shows that the fusion model has stable performance with strong anti- interference and can be handled easily.

Abstract: Artificial Neural Network(ANN) is an effective method of data analysis and way of processing, which is widely used. In the article BP artificial neural network was used to set up groundwater quality assessment model in Industrial Park Catchment. The matlab toolbox was used to calculate it, and the result was satisfactory. The results of the study show that BP artificial neural network in the appraisal of water quality has the advantages of simplicity and practical.

Abstract: The lake carbon circle is an important part of regional carbon circle research. The lake ecosystem is the important carbon storeroom in the earth, it absorbs a mass of carbon dioxide through photosynthesis, and transforms carbon dioxide to organically carbon, and then the lake has traits of abundant carbon reserves and heavy carbon density. As the especial geographical place and upper productivity, the lake has significant role in carbon circle. By now, there is clear acquaintanceship of greenhouse effect problem, especial we have qualitative and quantificational understanding of ocean carbon circle primary. But we have a little research of lake carbon circle and carbon flux. There are many lakes in China, so it is crucial meaning to study lake carbon circle. In this paper, the improved Static Chamber and Li8100 that used to monitor soil Carbon Flux are introduced. Through continuously monitoring from July to November 2010, in northern Grass-type Lake-Baiyangdian demonstration , a series of conclusion are concluded about lake Carbon Flux : the day-variation of Carbon Fluxes chenged significantly, and varying followed time and temperature, the highest Carbon Flux is consistent to the highest temperature; the rule of day-variation is similar to aforesaid the three months(except special days), but Carbon Fluxes are not same, August>October> November.

Abstract: Wuliangsuhai wetland located in Inner Mongolia Autonomous Region (IMAR) is selected as the study area to analyze the wetland environment variation of Inner Mongolia plateau. According to the growing conditions of water plants and the differences of water depth, the Wuliangsuhai wetland is divided into six typical areas, i.e. open water area, dense water weed area, reed area, swamp area, shallow water area and artificial reed area. The evolution trends and reasons of the six typical areas in terms of the variation of wetland characteristics are analyzed by using the Landsat TM/ETM data, the historical data and in-situ survey data. In addition, through the optimization comparison of multiple wave-band reflection combination, the regression equation of the water depth and wave band reflection combination of TM3, TM2 and TM1 is established based on the remote sensing principles, and the biological materials filling process is studied in detail. The purpose of the study is to find out the eutrophication control theory and technique measures. Due to the similar geographical and climatic conditions, the study results of Wuliangsuhai wetland could be expanded to other wetlands of Inner Mongolia plateau.

Abstract: Certain mechanical equipment control system of sampling signal processing in the digital content are discussed. Based on the wavelet transformation and multiresolution wavelet decomposition mathematics theory, the application of wavelet transform on feature extraction and noise removing; Instance are given.