Advanced Materials Research Vols. 189-193

Abstract: This thesis undertakes research of model construction of the blade, virtual machine with the UG software based on the steam turbine blade's structural features and CNC manufacturing craft. With the virtual simulation system of entire parts manufacturing based on VERICUT software, it avoids collision occurrence of components trying to cut with the machine, reduces manufacturing duration greatly of the blade production, improves quality of the blade, and reduces cost.

Abstract: The operation characteristics and reliability of composite insulator are analyzed in this paper based on operation experiences and test study results. The problems in operation are pointed out， which should be noticed and studied for the composite insulator in China. In addition, some suggestions to improving structure and technologies for the manufacturer are put forward.

Abstract: The electromagnetic shielding properties of short carbon fibers and graphite concrete were investigated, and the influence of the contents of the short carbon fibers and graphite on the electromagnetic shielding effectiveness of the concrete in low frequency was studied. The mechanism causing the influence of the short carbon fibers adulteration on the electromagnetic shielding effectiveness of the graphite concrete at low frequency was investigated. The maximum electromagnetic shielding effectiveness was up to 8.5dB in the low frequency range of 1MHz～1.8GH. The results of the investigation provide the basis for further designing and producing of high-powered electromagnetic shielding concrete at low frequency.

Abstract: When applied in E-Business, the technology of Web Services based on SOAP protocol can promote integration of E-commerce and distributed application. But it has some potential problems of security. Through research of technology correlated SOAP, combined with E-business safety analysis, the paper designs a kind of secure E-Business application model based on SOAP protocol. It includes SOAP secure disposal and access controller, and is realized by J2EE. The model makes the SOAP messages transmit safely and solves the secure problems of E-Business. It has great significance for popularization and application of E-commerce.

Abstract: Red-emitting phosphors Ca_0.7-x Eu_0.3Z4（X=0, 0.02, 0.04, 0.06, 0.08, 0.1）were fabricated by a solid state reaction method using (NH₄)₆Mo₇O₂₄•4H₂O, CaCO₃, Eu₂O₃ and ZnO as raw materials at the temperature of 600°C, 700°C, 750°C, 800°C, 850°C and 900°C, respectively. Phase components, grain morphologies and luminescence spectrum properties of the samples were analyzed and studied by the X-ray diffraction (XRD), scanning electron microscope (SEM) and F-4500 spectrophotometer. XRD analysis showed, with the temperature increasing, the width of the diffraction peak became narrow, but the peak value increased indicating the degree of crystallization became better and pure Ca_0.7 Eu_0.3MoO₄ phase can be obtained at 850°C. SEM analysis showed that below 800°C, the grain was small but contains lots defects, while above 850°C round-shaped regular grain of about 1µm can be obtained. Photoluminescence spectrum analysis showed the phosphors could be efficiently excited by a near- ultraviolet light with wavelength of 395nm or the blue-purple light with wavelength of 465nm, the emission peaks located at 592nm and 614nm respectively. The emitting intensity improved with the sintering temperature increased, and got the maximum value at 850°C, but a little decreased at 900°C. Zn²⁺ doping has no effect on emission peak position but can efficiently improve the emitting intensity of Ca_0.7Eu_0.3MoO₄ and the best doping concentration is about X=0.08.

Abstract: According to the structural characteristics of the multi-channel high-low pressure micro-ejection system,this paper sets up mathematical model of the trajectory based on the classical trajectory theory,makes numerical analysis to prove the rationality of the structural design,tests the pressure and bullet velocity of the launching system.The results show that the analysis and design methods of the multi-channel high-low pressure micro-ejection system are reasonable and reliable.

Abstract: Self-compacting concrete (SCC) has been used widely. However, the study of life-span prediction of self-compacting reinforced concrete is not enough under chloride ion corrosion condition， For the reinforcing bars corrosion that chlorine ions invade into SCC，the life-span prediction of Self-Compacting Concrete is the key issue. In this paper, the life-span prediction model of SCC structure under chloride ion corrosion condition is established and used to analyze the life-span prediction of SCC samples. Prediction results matched the test results very well, which shows the rationality of this prediction formula.

Abstract: The effect of the copper additions on the heating process and the microstructure of 6082Al-Mg-Si alloys was investigated. The results show that there are four exothermic peaks from 50°C to 450°C in the Al-Mg-Si-0.6%Cu alloys, and the center temperature of every peak is lower than the temperature in the Al-Mg-Si alloys. Based on the observation of transmission electron microscope and three-dimensional atom probe, it is found that the copper reduce the precipitated time and the precipitated temperature of the precipitates. The number of the precipitates in the Al-Mg-Si-0.6%Cu alloys increased.

Abstract: The design of steel column base plays a very important role in steel structure design. Through large-scale analysis software ANSYS, this paper analyzes the steel column base by finite element numerical simulation nonlinear analysis,and discuss the fracture behavior and restoring force characteristics of steel pipe column in different thickness and axial compression ratio,and the link between the two. The results showed that, (1) the section of most likely break focus on the bottom of vertical load plane in the middle of the steel column base. (2) with the increase of thickness, anti-cracking ability increased gradually.(3) Axial compression ratio of the specimen has little effect for anti-cracking ability relatively. (4) With the increase of anti-cracking ability, the seismic behavior of specimens gets heightened.

Abstract: Mesoporous silica hollow microspheres were quickly synthesized with a simple reaction medium which only contains tetraethylorthosilicate (TEOS) as silica source, octylamine (OA) as template and water. It is proposed that a dispersion of TEOS-in-water is formed when water is added into the mixture of TOS and OA. Water becomes basic due to dissolution of OA. Fast hydrolysis and condensation of TEOS then occurs at the interface of droplets lead to the formation of silica shells. Hollows are formed due to the volume contraction caused by the large difference in the densities of condensed silica and liquid TEOS. In addition, OA assembles with silica, templating the nanopores in the silica shells.