Advanced Materials Research Vols. 971-973

Abstract: In this investigation, we have synthesized pure and copper decorated tin oxide nanostructures with a facile yet environment-friendly hydrothermal route. The sensing materials are characterized by X-ray diffraction, field emission scanning electron microscopy, and energy dispersive X-ray spectroscopy. Thick-film gas sensors are fabricated from the as-prepared samples, and their gas sensing performances towards sulfur dioxide are calculated and evaluated by a Chemical Gas Sensor-8 intelligent gas sensing analysis system automatically.

Abstract: In this investigation, the rare-earth oxide Y₂O₃ combined with Al₂O₃ served as sintering additives and commercial α-SiC powder were applied to fabricate C_f/SiC composites by hot-pressing sintering. The results proved that combination of Al₂O₃ and Y₂O₃ sintering additives was effective for densification of C_f/SiC composites. The influence of annealed temperature on the phase constitution, microstructure and mechanical properties of the C_f/SiC composites was detailed. The combination of grain bridging, crack deflection and fiber debonding can improve fracture toughness. Keywords: Pressing sintering, Mechanical Properties, Annealed Treatment

Abstract: 1060 pure aluminium material parts after blanking, deep drawing, flanging with crimping mold edge forming, through process analysis and calculation, determine the blank, bending force, and choose to press. Mould structure analysis, and carries on the edge of major parts of the mold design, mold assembly drawing.

Abstract: Based on the assisted gravity draining steam flooding and the development technology of drive drain compound, using computational fluid dynamics software ANYSY CFX to analyze the impact of the reservoir with the angle of inclination and oil reservoir thickness and density of the crude oil on the oil (water) flow velocity. Research shows that: when the density of crude oil is close to the density of water, the speed difference is reduced. When the tilt angle is between 20^o and 60^o, the flow velocity was significantly reduced. When the reservoir thickness is between 20m and 40m, the growth of seepage velocity is more evident. Research results provide reference for seepage study of gravity drive of heavy oil .

Abstract: In this work, genipin cross-linked chitosan (CS)/hydroxyapatite (HA) composite scaffolds were fabricated by a biomimetic method, followed by product freeze-drying. The fabricated composites were characterized by XRD, FT-IR, HRTEM, SEM and CLSM studies. Mechanical properties of the composite scaffolds have been significantly enhanced and can meet the demand of spongy bone. So the developed CS/HA scaffolds have advantageous and potential applications for bone tissue engineering.

Abstract: A new manufacturing technology, external grind-hardening, is put forward and orthogonal tests are carried out with 3-level 3-factor aimming at 40Cr steel and 45 steel. A certain depth of Martensite layer is found on the hardened surfaces of both materials by metallographic observation and the hardness values meet the design requirement, which demonstrates the practicability of the new technology. Orthogonal analysis is proceeded successively for the acquirements of influencing pattern and significance of factors, and comparative study is carried on the hardening effect and feature for the both materials.

Abstract: Although underground structures have stronger aseismic performance than ground structures, seismic disasters of mountain tunnels were fairly conspicuous in Wenchuan Great Earthquake. On the basis of seismic disaster analysis, a composite lining designfor tunnel structures across active fault was put forward. Three-dimensional numerical simulation method was used to analyze aseismic and damping effect of this structure. The results show that: (1)After setting aseismic and damping structure, the maximum internal forces value in lining the pattern of internal forces will not change. (2)Aseismic and damping structure setting can directly reduce the bending moment value and increase the axial force and stress force value in lining structure. (3) Relative to aseismic and damping structure, grouting region around damping layer can ameliorate internal force condition in lining structure and improve the effect of aseismic and damping structure. The above research results contribute to provide reference for seismic fortification of tunnel structures across active faults.

Abstract: Objective: To explore the ATP bioluminescence assay for inspection, the feasibility of bacteria for the surface of the egg hygiene field fast detection provide the scientific basis. Methods: The ATP bioluminescence assay and national standard method (agar plate notation) compared to detection of 100 eggs, the natural pollution situation. Results: With increasing pollution, on the ATP biological fluorescence instrumentation examines the correspondence RLU (relative light units, relative fluorescence intensity) the value is bigger, the agar plate notation picks out the egg bacterium fungus number is more bigger, to the RLU value which picks out to the value and the colony total to the value makes statistics analysis of linear correlation, the result shows that R2 = 0.9466, it has statistically significant, positive correlation between the two. Conclusions: ATP bioluminescence assay can be used in food hygiene in the field of egg hygiene quick check.

Abstract: We demonstrate that that a quartz crystal resonator (QCR) is applicable to investigate the glass transition of the Poly (vinyl butyral) (PVB) thin films by the simultaneous measurement of both resonant frequency and bandwidths on several overtones. The response of resonant frequency and bandwidths of film coated quartz crystal directly reflects the information about surface mass and film shear modulus. This enable us to explicitly deduce the glass transition temperature and the shear modulus parameter of PVB thin films on different overtones from the frequency shift and the bandwidths shift. These results indicate the feasibility of using QCR technique to characterize glass transition temperature and viscoelastic properties of the PVB thin films.