Advanced Materials Research Vol. 983

Abstract: There are tens of thousands of highway miles with in-service concrete barriers all over the world. Many of them require upgrade to meet new collision protection level. In order to find a reliable and economical solution, authors of this paper develop three solutions in term of different materials and structures. Then, researchers use finite element to verify the effect of each solution and compare their expense. Advantages and disadvantages are discussed in the paper. Moreover, the paper explore the feasibility to adopt one of three solutions in the project in Guangdong province, China.

Abstract: Basing on the laser range finder needs calibration used in non-contact measurement the, using the triangle range principle, through the experiment of design of different material, surface roughness, the under the different distance of under the different distance between 40 mm to 60 mm is achieved, the under the different distance, demarcated the laser ranging sensor by least squares method and analyzed the pricesion.

Abstract: Chemical mechanical polishing (CMP) is often employed to obtain a super smooth work-surface of a silicon wafer. However, as a conventional CMP is a loose abrasive process, it is hard to achieve the high profile accuracy and lots of slurry must be supplied during CMP operations. As an alternate solution, a fixed abrasive CMP process can offer better geometrical accuracy and discharges less waste disposal. In this paper, in order to enhance the polishing efficiency and improve the work-surface quality, a novel ultrasonic assisted fixed abrasive CMP (UF-CMP) is proposed and the fundamental machining characteristics of the UF-CMP of a silicon wafer is investigated experimentally. The results show that with the ultrasonic assistance, the material removal rate (MRR) is increased, and the surface quality is improved.

Abstract: SiC single crystal substrate has been become an indispensable substrate material in the field of semiconductor lighting. But, there is no report on the commercial slurry of chemical mechanical polishing (CMP) SiC substrate. In this paper, according to orthogonal design, the composition selection and optimization of CMP slurry based on silica sol (SiO₂ abrasive) had been done in CMP SiC crystal substrate (0001) C surface by tests. The CMP slurry based on silica sol for SiC crystal substrate (0001) C surface had been obtained. According to the CMP test results, the material removal rate (MRR) is about 15nm/min and the surface roughness Ra is about 0.2nm.

Abstract: Complexes of cell-THPC-thiourea-ADP with Ca2+ have been prepared. The thermal stability and smoke suspension of the samples are determined by TG, DTA and cone calorimetry. The activation energies for the second stage of thermal degradation have been obtained by following Broido equation. Experimental data show that for the complexes of cell-THPC-thiourea-ADP with Ca2+, the activation energies and thermal decomposition temperatures are higher than those of cell-THPC-thiourea-ADP, which shows these metal ions can increase the thermal stability of cell-THPC-thiourea-ADP

Abstract: The effect of photoinitiator content and species for adhesive liquid-solid conversion rate was studied. The infrared spectras of the alicyclic epoxy resin adhesives before and after the UV light curing were detected by FTIR. Thus light curing process for the alicyclic epoxy adhesive material was explored. The results showed that the UV light curing speed of Omnicat 550 was slower than that of Omnicat 650. Furthermore, the liquid-solid conversion rate was the maximum when the photoinitiator was added up to 3% with the same agent and coating thickness.

Abstract: Machining of metals make use of thermal mechanical FEM model. Analysis of nonlinear elastoplastic finite element simulation of milling of 45 # steel material use software of ABAQUS that is finite element simulation technology. ABAQUS software could be carried out on prediction of the milling force. Through finite element analysis, distribution of stress field of workpiece and tool is obtained under the influence of thermal mechanical. The prediction accuracy of the model was validated experimentally and the obtained numerical and experimental results were found in good agreement.

Abstract: Design study of a synergetic system among small long life gas cooled fast reactors and renewable energy has been performed. A pump storage system is the center in the integration among considered energy sources. Using this system many renewable energy sources and the small nuclear power plant can be integrated to produce reliable energy sources which can be used for electricity production, desalination, etc. In this system each energy source can store energy by contributing pumping water from a low level reservoir to a high level reservoir. The nuclear power plant module must satisfy inherent safety requirement, and have flexibility in producing electricity, clean water (through desalination), etc. The reactor can be operated for 25 years without the necessity to refuel during that period. To achieve inherent safety capability it is important to minimized excess reactivity during burn-up to be below delayed neutron fraction value so that super prompt critical accident such as in Chernobyl accident case can be avoided. Here minimization of excess reactivity is carried out by adjusting core and blanket region width and plutonium enrichment in core regions.

Abstract: Cathode material LiFePO₄/C was prepared via optimized solid state reaction and calcinations using different carbon source. The crystalline and morphology of the resultant powder was evaluated by X-Ray diffraction (XRD), scanning electronic microscope (SEM). The electrochemical performance was measured by galvanostatic charge-discharge test at 0.1C and 0.5C. The results demonstrated that the sample with layer-like stacking microstructure had the best capacity retention up to 96% after 50-cycle at 0.5C; the sample with good carbon coating using glucose as carbon source exhibited the lowest flat charge plateau and the highest flat discharge plateau, also the best storage performance at 60 oC temperature. Nevertheless, the sample with spherical-like shape and homogeneous particle size had the most capacity loss, maybe due to the increased internal resistance caused by the big interstices between the particle sizes.

Abstract: In order to find out the correspond relationship of the outlet velocity and rotor speed in dry powder inhaler, the intermediate parameter was inserted in Workbench response surface based on CFD. The simulation of the suction drive rotor rotation mechanism was based on MRF model in FLUENT. It can be easily obtained the rotor’s performance curve under different aerodynamic conditions and found out the optimized flow rate is 66.127L/min. This method verifies the clinical phenomena and could guide the clinical research and machinery optimization.