Advanced Materials Research Vols. 468-471

Abstract: The purpose of this paper is to realize the auto division for functional area of intensive use meanwhile the efficiency and accuracy was improved. Method employed is that functional area of evaluation of intensive use was divided based on Delaunay triangulation and GIS. The results indicate according to comparison between results divided by expert and improved method that :( 1) The 26 functional areas divided by expert were totally covered by the method for auto division based on Delaunay triangulation and GIS. (2) There were 8 functional areas that coincided with the method for auto division, account for 30.77%. (3) The other 18 functional areas belongs to part coincidence, account for 69.23%.

Abstract: This paper modified the linear distributed load (LDL) model for cantilever nano-beams . A linear load model which suits boundary conditions was proposed to approximate with nonlinear intermolecular and electrostatic interactions. In the modified LDL model, under considerating the effect of the small scale, the pull-in instability behaviour of nano-actuators subjected to an electrostatic force and intermolecular force had been investigated. The results showed that the modified LDL model is more consistent with the actual situation than LDL model.

Abstract: We combine an integrated study of gas hydrate reservoirs in a marine area from seismic data which collected for oil and gas exploration purpose. This study combines analyses of geology and seismology. First, geological analysis is made using data of material sources, structures and sediments to determine the hydrocarbon formation conditions of gas hydrate. Then seismic amplitude attributes analysis is conducted to predict the potential existence of four types of BSR in this area. Finally, pre-stacked inversion is conducted to predict the potential existence of hydrate and its free gas. Results show that gas hydrate is widely distribute in this area, and the distribution controlled by material source, reservoir space, and geothermal conditions.

Abstract: Urban close-to-nature plant community is a sustainable design and construction philosophy of landscape greenbelt planning. However, there is no explicit guide for constructing close-to-nature plant community Based on the analysis of community structure and characteristics of 10 typical natural plant communities in the West Lake Scenic Area in Hangzhou and summary of the features of natural community, as well as the analysis of plant landscape of Hangzhou Huagangguanyu Park to prove that the close-to-nature man-made plant community and natural plant community are interrelated in respect of vegetation composition and community structure, this paper puts forward to the essential construction methods of the close-to-nature landscape community, providing theoretical basis for research and construction of urban close-to-nature landscape plant community in China.

Abstract: European beech specimen by respectively 100 °C, 120 °C, 160 °C of steam pretreatment and then conventional drying. In accordance with GB 1932-80, GB 1934.2-91, GB 1934.1-91, GB 1933-91 and the surface defects after drying and then explore the different temperatures of steaming pretreatment on the European beech’s shrinkage, swelling, water absorption and density of material impact. Ultimately determine the temperature of steaming pretreatment which can enhance the dimensional stability.

Abstract: Taking β-cyclotextrin and gelatin as wall materials, study of inclusion was processed on astaxanthin. It was shown in the study that β-cyclotextrin and gelatin at the ratio of 4 to 1 was found to be the best wall material for inclusion complex. The optimal conditions of inclusion were established by the RSM experiment: when the amount of wall material was 0.4 g/g yeast, temperature 40°C, time 1.2 h, the inclusion rate could reach 81.03%. The characterization of the inclusion complex was confirmed by different temperatures and light, the result shows that the inclusion complex could improve the stability of astaxanthin. The inclusion complex was stored in dark at 4°C for 60 days, the residual rate of astaxathin could reach 95% and more stable than that before inclusion by 35%.

Abstract: As a combination of divided wall column (DWC) and reactive-distillation column, the reactive divided wall distillation column is a highly complex technology that reaction and separation can occur simultaneously, which can reduce the energy consumption and decrease the costs of captial and operation. This new process was simulated with PROⅡ software and mini plant experiments were implemented. In addition, we investigated the influences of reflux ratio, liquid distribution ratio and molar ratio of ester in water on the conversion rate of methyl acetate and the purity of the product respectively. It could be seen that the trend from experiments was suitable with simulation results.

Abstract: In order to study the characteristics of elastic wave field of the two-phase media of coal rock, a model of stratified two-phase media containing coal rock was proposed. A zero phase wavelet of higher resolution selected, a forward simulation of elastic wave field was performed on the model using MATLAB programming language. Simulation results show that the vibration amplitude of the elastic wave field, when propagating in homogeneous stratified coal rock media, vary with the variation of porosity, which indicates that it is feasible to utilize the elastic wave approach to detect the porosity of two-phase media of coal rock and has a certain significance in exploring the structural feature and pore property of underground water-contained coal rock.

Abstract: The definition of assembly force is defined in this paper. The assembly force is classified according to the different states of assembly parts. The draft-hole assembly is presented as an example to analyze how the assembly force effects the process of virtual assembly. A kind of virtual assembly motion method guided by assembly force is proposed to simulate the real assembly process. A prototype system based on assembly force is presented.

Abstract: The low frequency vibration of vehicle is very popular. The vibration can reduce ride comfort and cause early damage of part, so we must do something to reduce it. But the vibration has more complex impact factors, so it is very difficult to solve it. This paper has studied a new method to reduce it. It has studied the natural frequencies of the frame on the platform of OptiStruct software. Through the research, we find that the first order mode natural frequency of the frame is close to the external motivation, which is caused by moving unbalance of wheels. It leads to the resonance phenomenon, which is the main reason for vehicle low frequency vibration. In order to improve the vibration, this paper has researched the principle of SIMP topology optimization technology, and searched for the topology frame structure, whose first mode natural frequency is far away from the external motivation. Finally, this paper shows a new design for the frame, which reduces the low frequency vibration of vehicle greatly.