Advanced Materials Research Vols. 989-994

Abstract: Ca₂MgSi₂O₇: Eu³⁺, Ce³⁺, Tb³⁺, a single white Phosphor, was synthesized by the conventional solid-state reaction. The structure, surface morphology and luminescence properties of the prepared samples were investigated to evaluate its potentiality. XRD results confirm the orthorhombic phase of Ca₂MgSi₂O₇: Eu³⁺, Ce³⁺, Tb³⁺ phosphors. The excitation spectra indicates the phosphor can be excited by 393 nm wavelength. The phosphor exhibits blue light at 467 nm, green light at 588 nm, red light at 618 nm. CIE chromaticity diagram indicates that Ca₂MgSi₂O₇: Eu³⁺, Tb³⁺, Ce³⁺ exhibits white light. All properties show that the prepared phosphor is a single white phosphor suitable for near ultraviolet excitation which can be applied to new generation white LED lighting.

Abstract: Based on detailed analysis of crystal process in Chloroacetic Acid (MCA)’s production, a certain control method is exert on it. In order to overcome the time delay ,large inertia, time-varying ,a fuzzy Smith intelligent method is proposed.Simulation results show that this method apparently is superior to the general PID control and Smith control.

Abstract: In this paper, the influence of SnCl₄ concentration on deposition rate, tin content, corrosion resistance and surface appearance of the coating are researched respectively. The results show that SnCl₄ concentration is increased, deposition rate is increased, then reduced. Tin content in the Ni–Sn–P coatings is increased with increasing SnCl₄ concentration in the solutions. However, Ni and P contents in the coating is decreased slightly. The microhardness of plating before and after heat treatment is above 500HV. The hardness will be improved a little after heat treatment. With increasing SnCl₄ concentration, the polarization curves slightly move to positive direction and decrease corrosion current, which shows that the introduction of tin tends to enhance resistance corrosion of the coating. When SnCl₄ concentration is up to 30g/L, resistant corrosion of the films presents a drop various degrees. The deposits is smooth and uniformity, smooth by SEM and the content of tin is 2.5 to 4.1 percent by EDS.

Abstract: Environmental rubber concrete is a new building material, which can improve the construction quality of road drainage tube in road engineering and achieve effect of keeping warm and radial anti deformation. In order to study the physical properties of environmental rubber concrete, we use methods of experiment and numerical simulation to test mechanical parameters and effect of thermal insulation of concrete. Through the experiment we obtain the relation between ultimate bearing capacity and temperature. We use the software of ANSYS to secondary development on c numerical calculation, and establish a mathematical model of road drainage tube. Through the numerical simulation we get the temperature distribution and the radial strain nephogram of environmental rubber concrete. It provides a new method to study new materials in road engineering.

Abstract: In this study, corncob hemicelluloses were extracted by hot water to investigate its potential for film production. Extracted hemicelluloses were mixed with PVA 30 wt%, the prepared films had a smooth、uniform and continuous surface and dense cross section without the phase separation, as characterized by SEM. Besides, the mechanical properties and thermal characteristics tests showed that the films had a tensile strength of 4.6 MPa, elongation at break of 6.4%, and a nice thermally stability.

Abstract: With the rapid development of economy and the acceleration of the process of city, the problem of the atmospheric particulates is getting more and more serious which has severe impact on human health. Consequently the atmospheric particulates weather management has become a very realistic and an urgent problem to solve. The atmospheric particles mainly consists of water soluble aerosol and non water soluble aerosol. For the water-soluble aerosol should be removed by aerosol hygroscopicity, and for non water soluble aerosol by method of atmospheric water vapor liquefied or artificial humidification, making the small water droplets in the air further increase. So the water vapor can absorb non water soluble aerosol, through the settlement removal.So the utilization of these principles can achieve the purpose of absorbing the atmospheric particulates in the air.

Abstract: Corrosion behavior of a low alloy steel A with 3% nickel content was studied by a wet/dry cyclic test. A commercial weathering steel Q450NR1 was used for comparison. The classical weight loss method was used to evaluate the weatherability of weathering steel, while the iron rust layers formed on weathering steel were analyzed by using SEM, XRD and electrochemical measurements. The results indicated that the corrosion resistance of steels A was better than that of commercial weathering steel Q450NR1 in the wet/dry cyclic test. The addition of Ni promoted the formation of α-FeOOH so as to improve the resistance of the rust. The EIS results indicated that the charge transfer resistance of steel A was bigger than that of steel Q450NR1.

Abstract: Applying the research result of the whole corrugated web H-beam to rail structure, a new kind of rail structure, the corrugated web rail was generated. The special structure rail was successfully rolled in the Research Mill Institute of Yanshan University. Based on the finite element analysis software DEFORM-3D, the rolling process of corrugated waist rail is simulated. The miscrostructure evolution of rolling corrugated waist rail is analysed. The relationship between miscrostructure evolution and deformation are also analysed.

Abstract: The corrugated waist rail has been successfully rolled in the Mill Research Institute of Yanshan University.Based on commercial FE software of DEFORM-3D, the recrystallization in the rolling process of corrugated waist rail was simulated, the factors affect the recrystallization are analyzed. The different reduces and rolling speed that affect the recrystallization are also analyzed.

Abstract: To protect the underlying soil and groundwater from landfills, the landfills are commonly lined with layered liner systems. Geosynthetic clay liners (GCL) have been increasingly used in the landfill liner systems to substitude the traditional compacted clay liners (CCL) because of their low cost, easily construction behavior and low leakage rate. To study the behavior of the GM+GCL liner system used in China due to the migration of Pb²⁺, we introduce in detail GM+GCL liner systems proposed by the Chinese specification. Then one dimensional finite layer model is used to investigate the anti-pollution behavior of the CM+GCL composite liner systems, with the focuses on the heavy metal Pb²⁺. It could be concluded that the main migration way through the GM+GCL composite liner system is that the transport of Pb²⁺ through a GM+GCL composite liner system of a landfill cover takes place primarily through the holes in the GM. The findings provide useful reference for preventing, controlling and treating groundwater pollution in the GM+GCL liner system technically and scientifically.