Advanced Materials Research Vols. 433-440

Abstract: A series of experimental research results on the characteristic of diesel elastic-plate impingement spray using High Speed Photography camera are presented in this paper. The experiments were carried out in a constant volume chamber specially designed, which can hold a high ambiance pressure. The special fixed device was designed so that the elastic-plate can be fixed on the spray path, meanwhile the spray incident angle and height can be changed. The free jet spray and elastic-plate impingement spray was compared under the same experimental condition including different injection pressure and different background pressure. Experimental research showed that impingement spray droplets diffuse more quickly than free jet spray.

Abstract: In this paper, the Riesz basis generation of the Euler-Bernoulli beam equation with with boundary energy dissipation is studied. Using the regular property of the boundary conditions, it is shown that the Riesz basis property holds

Abstract: This paper research the algorithm after image segmentation based on using downsampling to preprocess the image and Otsu to segment the image, because defect region is weakened in the process of preprocessing to remove the texture, which lead to the defect region in the binary image can not reflect the original defect information. In view of this shortcoming, this paper put forward a new method to link the different connected regions which belong to a defect region and the new method solve the problem of weakening the defect region in the process of preprocessing, and then the integral information of defect region can be obtained. At last, the experiments’ results prove the validity of the arithmetic in this paper.

Abstract: The Standardization of High-strength Concrete Pole and Pole section Combination can solve Non-standard state on design, bidding and production. Exploring the formulation of Standard pole and Pole section combination is a work of carrying forward the cause and forge ahead into future. Starting with the analysis of existing production capacity and the development of standards, the paper design 8 series of pole section combination which contain 44 types or 153 standard pole combination, and intuitively explain every pole combination’s design, production, bar code and the cracking test moment limits by the List of forms. Finally, the paper generally explained the pole’s standard combination, and pointed out theirs’ way of the use and expansion.

Abstract: A catalyst based on Fe/active carbon (Fe/AC) and H2O2 as oxidant for the catalytic wet hydrogen peroxide oxidation of phenol in aqueous solution was investigated. The results indicate that the degradation rate of phenol(20mg/L) reach 90.5% in the presence of Fe/AC(2g/L) and hydrogen peroxide (0.5 %) at pH value 7 after 5 hours under normal temperature and atmospheric pressure. Kinetic studies of the degradation reaction show that the degradation rate of phenol nearly follows the first-order reaction. The reaction rate constant and activity energy are 0.4162 min-1 and 23.64 kJ/mol at 25°C, respectively.

Abstract: Under continuous observation of the TN, NH3-N and NO3-N levels of the influent and effluent, as well as the changes in permeability coefficients of bioretention tanks with different engineered soils, the nitrogen removal capacity and mechanism of bioretention tanks were investigated. The research showed that the bioretention system had advantages in the nitrogen removal of rainfall runoff, and the average removal rate rose from 50% during the stabilization stage to up to 70% after running for 9 months. In addition, the permeability coefficients of bioretention decreased as the nitrogen removal capacity increased, with the permeability coefficients decreased by as much as 50% or even up to 90%. This study is of great importance for further exploration on the mechanism and application of bioretention technology in the purification of rainfall, and may play a positive role in promoting an environmentally-friendly society as well as sustainable development.

Abstract: Sodium compounds, Na2CO3，Na2SO4，NaCl, have been investigated with regard to their catalytic effects on chlorella pyrolysis by thermal analysis experiments. The influence of catalyst categories and dosage on chlorella pyrolysis were studied by the comparison and analysis of the TG（thermogravimetry）and DTG(derivative thermogravimetry) curves derived from tests of differential thermal balance of untreated chlorelal and chlorella mixed with three inorganic compounds of certain scale.The results show that the catalytic effect of the sodium compounds follow Na2CO3>Na2SO4>NaCl, Catalysts of Na2SO4，NaCl decreased the maximum weight loss rates while Na2CO3 increased them. And all the three additives lowered the pyrolysis temperature of chlorella，of which Na2CO3 made the highest conversion of chlorella pyrolysis. As the dosage of carbonate increased, the pyrolysis temperatures decreases and the maximum weight loss rate increases, but the conversion rate of chlorella pyrolysis decreases, considering these two factors, 5%wt is chosen as the optimal dosage of the catalysts.

Abstract: To get the effect of hydrogen addition under different initial pressures, different initial temperatures and different initial equivalence ratios on combustion pressure, relevant tests of methane-hydrogen-air mixture have been carried out in constant volume combustion bomb. The results showed that higher initial temperature and lower initial pressure is helpful to get higher flame propagation velocity while other initial conditions keep invariable; as hydrogen blend ratio increases, both maximum combustion pressure and maximum rate of pressure rise increase, with the appearance time obviously earlier and cycle-to-cycle variation obviously lower.

Abstract: Photocatalytic degradation of bisphenol A in aqueous solution by UV-TiO2 was studied in self-made photocatalysis reactor. The results showed that BPA was degraded effectively in UV-TiO2 photocatalysis system, and the processe followed Langmuir-Hinshelwood kinetic model. When TiO2 was dosed at 1.0 g/L, air amount was 1.2 L/min, BPA initial concentration was 10 mg/L with pH=5.5, and irradiated by a 15 W low pressure mercury vapor discharge lamp, the removal rate of BPA was up to 97%, and BPA was completely removed in 80 min when pH≥9.5; The photocatalytic removal rate constant was strongly related to the above factors.

Abstract: A quaternary ammonium-based ionic liquid, n-butyl triethylammonium bis(trifluoromethane-sulfonyl) imide (N₄₂₂₂TFSI) was synthesized by using microwave and conventional methods. The structure of N₄₂₂₂TFSI was characterized by FT-IR, ¹H-NMR and ¹³C-NMR. Its properties including viscosity, solubility, conductivity and density, were determined. Its applications as electrolyte and solvent for UV-VIS determination were also investigated.