Advanced Materials Research Vols. 503-504

Abstract: The Fe-Ni magnetic alloy irradiated by 10 MeV and 20 MeV protons were simulated by TRIM program. The energy loss and irradiation damage were calculated, and some important results were concluded. The average number of vacancies of the irradiation with 10 MeV and 20 MeV protons are 131.7 and 214.5. The damage rate of the Fe-Ni magnetic alloy irradiated with 10 MeV and 20 MeV protons are 2.278×10-6 dpa/s and 1.227×10-6 dpa/s. For the 1µA protons, in order to reach the radiation damage dose of 2 dpa, it will need 244 h and 453 h irradiated by 10 MeV and 20 MeV protons respectively.

Abstract: In this paper, effects of the parameters of sloping plate process on microstructures of A2017 alloy were investigated, and semisolid ingot of A2017 alloy was prepared. The grain size of the ingot prepared by the wavelike sloping plate is much smaller than that prepared by the flat sloping plate. The primary grain becomes rounder and smaller with the increment of the sloping plate length. High preheating temperature of the plate reduces the nucleation rate of the melt and leads to coarse microstructure. When the casting temperature is 720°C, the sloping angle is 45°, and the wavelike plate length is between 400mm and 500mm, semisolid ingot of A2017 alloy with fine and homogeneous microstructures can be obtained. The reheated microstructure of semisolid ingot is mainly composed of spherical solid grains and the melted liquids and is suitable for semisolid forming.

Abstract: In this study, cobalt nanoparticles with an average size of 16 nm were synthesized using cobalt-acetate as precursor. Besides oleylamine and oleic acid, sodium oleate was selected as surfactants to control the size of particles. The obtained particles show cubic shape and uniformly disperse. The hysteresis curve of cubic nanoparticles detected by vibrating sample magnetometer (VSM) reveals that the coercive force Hc is 297.62 Oe and the saturation magnetization Ms is 56.55 emu/g.

Abstract: The N-In codoped p-type ZnO films with preferential orientation along (002) plane have been fabricated on quartz glass substrates using radio frequency magnetron sputtering technique of ZnO:In2O3 powder target combining with N-implantation. The samples annealed at 700°C deserved the optimal properties, the best of which exhibits electrical characteristics with the hole concentration of 4.04×1018 cm-3, the lowest resistivity of 1.15 Ωcm and Hall mobility of about 1.35 cm2V-1s-1. The effects of post-annealing on the microstructure and electronic properties of the codoped ZnO films is analyzed via SEM, XRD, XPS and Hall measurements system, and the trend of carrier concentration with annealing time is discussed theoretically.

Abstract: As the public voice to protect traditional culture is upsurging gradually today, it is significant to study the wood drum of the traditional Wa culture so as to better protect and exploit the culture. This essay, mainly consisting of three parts: the origin of the wood drum, its functions and its cultural meanings, aims to interprate the important role of the wood drum in the Wa community form a new perspective. Through the study of the three aspects, it is concluded that the reasons why wood drums have played such a crucial role in the Wa community are mainly derived form the primitive society the Wa nationality was in and its surroundings. Therefore, to exploite the wood drum of the Wa nationality can not only protect the nation’s traditional culture but can also improve its tourism economy.

Abstract: Using cation amino polysiloxane emulsion(ASE) and anion carboxyl polysiloxane emulsion (CSE) as materials, mixing ASE and CSE together to self-assemble or aggregate by electrostatic interaction, supramolecular compound emulsion (ASE-CSE) was formed. TEM and particle size analyzer observation showed that the particle of ASE-CSE is sphericity, and its particle diameter is bigger than that of mono-composition emulsion and has single-peak distribution. SEM, atomic force microscope (AFM) and other instruments detections indicated that the ASE-CSE possesses good form-film property. The ASE-CSE film on the silicon wafer is very rough. There are many islands or peaks package on the film surface. The average thickness of the film is 12.45nm, and it is about 7.1 times as against ASE. With the ASE-CSE film, the stripes or grooves on the fiber surface is weakened or disappeared. And the surface is smoother than that of the control sample. In addition, the contact angle of the cotton fabric treated by ASE-CSE is 86.5°. This reveals that the ASE-CSE film brings fiber fabric from hydrophile to hydrophobe.

Abstract: Ceramic inlays can be used on premolars requiring a MOD restoration instead posterior composite resins direct restorations and offer a durable alternative. Because it is known that MOD inlays may increase the susceptibility to fracture, it is important to ensure optimal performance in selection of the adequate preparation design to reduce stresses in teeth structures and also in the restorations. The aim of the study was to determine, using finite element analysis, the optimal shapes of ceramics MOD inlays in premolars in order to minimize the potentially damaging effects of stress on teeth structures and restorations. The study was performed on an upper first premolar, using a finite element analysis. 3D models of maxillary first premolars, prepared for MOD inlays with different tapers were generated. The mesh structure of the solid 3D model was created using the computational simulation of Ansys finite element analysis software. An occlusal load of 200 N was conducted, and stresses occurring in the ceramic inlays, and teeth structures were calculated. The study provides a biomechanical explanation for inlays restored teeth. MOD inlays transfer functional stress to the teeth structures. The taper of the preparations had no significant influence on the stress values for all the studied cases.

Abstract: Silicon steel plate is main material of motor and transformer , and was always used die for its production . Through water cutting test , the cutting speed of beeline and arc and water pressure was adjusted , the water cutting technology was mastered . The quality of production such as dimension , burr height was controlled well . The cut area was not rust because of using dry technology and the magnetic conductivity was not affected using water cutting . It will provides a speediness way for silicon steel plate production .

Abstract: To compare the different effects under different excitation methods during the measurement on the particle size of silicon carbide (SiC), an experimental system has been established to get different signal excitations of burst wave, continuous wave and pulsed wave. Variable sound path method is adopted during the measurement to obtain the ultrasonic attenuation spectrum of SiC suspensions with two immersion transducers at four different mass concentrations under the same experimental condition. It is found that the ultrasonic attenuation coefficients excited by three different waves increase with increasing frequency and the tendency is approaching the same. The result calculated by a normalized spectrum of the optimal regularization methods shows that SiC particle size distribution under the three excitation methods is similar, which indicate that the different excitation methods on particle size characterization have almost no influence to result.

Abstract: The solidification path of Al-Cu-Si alloys in the Al-rich corner are investigated. The thermodynamic data needed in the calculation are obtained by direct coupling with the CALPHAD software Thermo-Calc. A paralell experimental investigation is conducted to validate the prediction results. The calculated results show that, the sensitivity of the variations in the solidification paths to the cooling rates are depended on the distance of the initial compositions from the binary eutectic troughs or the ternary eutectic point. Reasonable agreements are observed between the predicted amounts of θ-phase and the measured results.