Advanced Materials Research Vols. 347-353

Abstract: The Von Mises equivalent stress criteria is used to equivalent convert and correct the uniaxial and biaxial fatigue reliability experimental study of the casing material. And the probabilistic fatigue P–S–N curve of the casing is gained. The fatigue limit and fatigue life in test is equivalent convert to actual casing by combined stress correction factor. A multiaxial fatigue life calculation formula is proposed by correcting the probabilistic fatigue P–S–N curve.

Abstract: The coal dressing method of heavy medium has many advantages, as follows, the strong adaptability on coal quality of raw coal ,high precision of separation, the wide grade range, Craft system simplification, easy to realize the automation and other advantages, which have rapid development trend both at home and abroad. Heavy medium density automatic control system is one of the most important key, that height and stability play a decisive role on the quality of products and production rate for coal production process. In this article, the heavy medium density is accurate measured with the ultrasonic attenuation theory, he law of attenuation is analyzed in the heavy medium density liquid, the relationship between the density and sound attenuation is summarized. And the closed loop automatic control is realized based on which and the separation efficiency is improved, the cost is saved.

Abstract: Cassava residues were taken as main raw material, Aspergillus oryzae and Aspergillus usamii were chosen as glucoamylase preparation, and response surface was used to optimize and analyze saccharification temperature, pH, rate of enzyme and total amount of Aspergillus (g/100g cassava residues) so order to find out the best operation conditon for cassava residues saccharification. It was found that the best operation condition for Aspergillus to saccharify cassava residues were as follows: saccharification temperature 70°C, pH 4, ratio of Aspergillus oryzae and Aspergillus usamii was 3:9, total amount of Aspergillus 10%, and it turned out to be a total reducing sugar content of 2.70g/L.

Abstract: With the increasing degree of mechanization coal mining, the coal proportion less than 0.5 mm grade was increased year by year in raw coal in our country, which increase the difficulty of the slurry water treatment. However, the treatment can reduce the concentration of Wash water, realize the closed water circuit. And the economy of water resources the reclaim of coal and the protection of ecological environment can be influenced. And the correct detection of slime water concentration is the basis of all work. At present, the gamma-ray detection method is used to test Coal Slurry water concentration, with which there are a lot of inconvenience. The ultrasonic technology is introduced to detect coal slurry water concentration. The ultrasonic attenuation rule in the slurry water and the factors of affecting the acoustic attenuation are researched. The solutions are brought up. Tests show that ultrasonic detection technology can replace the traditional gamma-ray method and has great practical value.

Abstract: A novel Artificial Neutral Network (ANN) algorithm based on Principle component analysis(PCA) is proposed and applied to predicted the retention index of a series of hydrocarbons in FCC gasoline. The PCA technology is utilized to preprocess the mass spectrogram of FCC gasoline for parameter selection and to reduce the input of prediction model, which thus improve the input factors and eliminates the correlation among the inputs. Then new sample data are input into radial basis function-artificial neutral network(RBF-ANN) to construct the prediction model.156 compounds were divided into two subsets. RSM of training set and testing set is 0.9958 and 0.9991, respectively. The satisfactory results were obtained.

Abstract: In study of Land Use Change forecasting, lots of methods have been developed ,such as Markov model、BP algorithm、Canonical correlation analysis, least-squares regression analysis ,but these methods have deficiency in decision and often inadequate in sample size. In response to these deficiencies，projection pursuit Partial Least-Square Regression based on real coded accelerating genetic algorithm model is developed to analyze and predict land use change in Yanji City. The computation results show that the relative error of Coupling Model of Partial Least-Square Regression Based on Projection Pursuit is smaller than traditional Partial Least-Square Regression model’s, and it has improved the prediction precision evidently.

Abstract: Pottery stone (PTS) filled polypropylene (PP) composites were prepared using a twin screw extruder and injection molding machine. PTS used in this study is in a particulate form with an average particle size of 6.95 μm. The melt flow index (MFI), tensile properties (tensile strength, Young’s modulus and elongation at break), notched-impact strength, flexural strength, thermal stability and morphology of the PP/PTS composites were investigated. The results showed that the incorporation of PTS into the PP matrix caused a slight decrease in the MFI, an increase in the tensile strength (5 and 10 phr, but 10 phr optimal), Young’s modulus (all, but 20 phr optimal), impact strength (all, but 20 phr optimal), flexural strength (all, but 10 phr optimal) and thermal stability (all, but 20 phr optimal) and a decrease in the elongation at break. Therefore, PTS can be effectively used as reinforcing filler in PP. The fractured surfaces of the composites displayed the well dispersed of PTS in PP matrix and also exhibited plastic deformation feature.

Abstract: The distributed power generation is an energy development way which can most manifest the multiple advantages such as the energy saving, emission reduction, safety and flexible trait. As a kind of distributed power generation technology of renewable energy, photovoltaic power generation has already transited from supplement energy to alternative energy. Although solar photovoltaic power generation industry develops very quickly in China, actual application cases of substation photovoltaic grid-connected power generation system are few. In this paper, the research of photovoltaic grid-connected power generation system is used in Zhuishan substation in Bengbu Anhui province. The system is the first set of substation photovoltaic-connected grid power generation system in Anhui province. It has being operated for three years safety and steady. The whole application of the system is advanced and groundbreaking in the domestic.

Abstract: The distributed power generation technology which is represented by solar photovoltaic power generation has been recognized for having the enormous advantages such as energy conservation and emission reduction, improving the reliability and flexibility of power system. In this paper, the research of photovoltaic dc system is used in 110 kV Zhegao substation in Chaohu Anhui province. The system is the first set of substation photovoltaic dc system in Anhui province. It has being operated for three years safety and steady. The whole application of the system is advanced and groundbreaking in the domestic.

Abstract: In this paper, membrane absorption method was introduced. Analyzed and studied flue gases passing in the shell side (hollow fiber membrane) and in the pipe side (membrane lumen) respectively. Total mass transfer coefficient and de CO2 efficiency were calculated. For flue gases passing in the pipe side, total mass transfer coefficient was 1.1191×10-4m/s and de CO2 efficiency was 73.8%; while for flue gases passing in the shell side, total mass transfer coefficient was 3.4701×10-4m/s and de CO2 efficiency was 98.0%. The results showed that the flow of flue gas flowing in the lumen is better than the flow of flue gas flowing out of the hollow fiber membrane from the point of views of removal rate and mass transfer. To build de CO2 experimental devices, flow of flue gas flowing in the pipe side was proposed.