Advanced Materials Research Vols. 129-131

Abstract: A definition evaluation function is proposed for the Vickers hardness indentation images in this paper. Based on the characteristics of Vickers hardness indentation image, we choose the gradient function as definition evaluation criteria for the image. Because of the advantage of Brenner evaluation function and the image features itself, this paper puts forward a new evaluation function at the idea of Brenner evaluation function, that is not only more suitable for evaluating the Vickers hardness indentation image than Brenner function, but also having the merit of it and becoming more practical according to the experiments.

Abstract: Silicon-Germanium (SiGe) single crystal is a fully miscible solid solution with diamond-base, and has attracted keen interest as material for applications such as microelectronic and optoelectronic devices. Consequently, there is a need for SiGe crystals of low dislocation density and large dimensions. In this study, the growth mechanism and methods of SiGe bulk single crystal were described and the PMCZ method made by ourselves was analyzed. The properties of PMCZ SiGe single crystal with different Ge concentrations were discussed. The result shows that the longitudinal distribution homogeneity of impurity Ge was improved on the effect of magnetic field; with Ge concentration creasing, oxygen concentration in SiGe crystals was decreased, and the crystals mechanical strength faded up; with Ge-doped increasing, there appears new absorption peak near 710cm-1and 800cm-1 wave number in Si FTIR absorption spectral graph. From the results, it can be found that with improving the growth technique and increasing Ge concentration, the quality of SiGe single crystal will be improved effectively.

Abstract: A series of zinc oxide-modified mesoporous SBA-15 materials were synthesized. The desulphurization test with a gas mixture containing 0.1 vol % hydrogen sulfide was carried out on these materials. Materials before and after the desulphurization test were analyzed using a variety of characterization techniques. The results suggest that zinc oxide modification can accelerate the transformation from a mesoporous to a zeolitic phase. The sample with the zinc content higher than 15.5 wt % shows the highest hydrogen sulfide breakthrough capacity up to 177.3 mg S/g.

Abstract: Three mixed liquids, Styrene, Methylmethacrylate and Vinyl acetate were used to soak poplar veneer to obtain strengthen poplar veneers. The optimal molar ratio was fixed on 1:2:1.Soaking and polymerization technology were obtained as pressure 0.4Mpa, packing time 60 minutes, polymerization temperature 80°C, polymerization time 6 hours, cobalt naphthenate 2%, zinc chloride 6%, and azobisisobutyronitrile 3%. The impact of high temperature on the conversion was significant in the chosen level, other factors on the conversion rate was not significant.

Abstract: oleic acid-modified nano-titanium dioxide were synthesized by Oleic acid and tetrabutyl titanate via the sol-gel method, and characterized by IR TEM TG-DT A and XPS. Comparison with the data of the IR, the combination of carboxyl is chelating with Ti atoms. Based on the analysis of IR, TG-DTA and XPS, this paper suggests a model about the oleic acid-modified titanium dioxide nano-structure, and to provide a basis for future applications.

Abstract: This paper presents a scheme to develop a remote experiment platform for robot. The structure based on Internet and Browser/Server is adopted and discussed. The software of the platform is divided into simulation system, control system, multimedia acquiring system and transaction management system. Finally, the key technique and components are discussed, and CGI application and MATLAB software are recommended. The scheme can also be used in other remote control or measurement system.

Abstract: The causes of the honeycomb core node separation/core crush defects of fiberglass sandwich panel is analyzed. The porosity of skin and leakage of vacuum bag under high-pressure curing environment are identified as root causes based on the analysis of historical data and designed simulation testes, and approved by statistic analysis calculation also. The relationship of core thickness and the opportunity of the defects appearing are discovered by tests.

Abstract: The influence of cutting conditions on temperature of CBN cutting tool edge during dry hard machining of hardened AISI D2 tool steel (62±1HRC) is investigated in this paper. Measuring cutting tool edge temperature with experimental methods is time-consuming and diseconomy in dry hard machining. In this paper, Johnson–Cook model is utilized to propose finite element (FE) orthogonal cutting model. The FE model is properly calibrated based on the comparison between experimental resultant forces obtained from literatures and simulated resultant forces. Then, the FE model is utilized to predict influence of cutting speed and depth of cut on cutting tool edge temperature in dry hard machining hardened AISI D2 tool steel. As shown from this investigation, the maximum temperature in the secondary deformation zone is a little lower than that in the rake face of tool tip. And maximum temperature in high-temperature zone is in the range of 984-1065K.

Abstract: Sustainable product design has become the tendency of the product design because the degradation of the environment. However, there are no effective methodologies or framework designers and developer eager to. This paper base on the soft system methodology present a methodology which is effective to the idea generation phases in sustainable product design process. From the need identification to the idea generation, sustainable product design criteria and relationship between it and customer requirements, 39 engineering parameters, 40 inventive principles were use in the methodology. An example is illustrated to show the process of this work flow, and the result show the effectiveness of the methodology.

Abstract: Concrete deformation due to temperature and moisture condition will always develop simultaneously and interactively. The numerical simulation of hygro-thermal deformation of concrete is necessary to be investigated for better serviceability, durability estimation and life prediction. In this paper, a numerical simulation procedure was proposed for hygro-thermal deformation of concrete based on the principle of heat and moisture transfer in porous medium. The procedure comprised an analytic solution of heat and moisture transfer, a calculation of moisture induced stress and a finite element analysis (FEM) of hygro-thermal deformation. The methodology of a software named Coupling Temperature and Moisture Simulation System for concrete (CTMSoft) was represented and developed by a mix programming. The graphical user interface (GUI) of the software was programmed by Visual Basic 6.0 and its real numerical calculation process was conducted by calling Matlab and ANSYS. The efficiency of the CTMSoft was validated by a case analysis of the data of Hundt’s test.