Key Engineering Materials Vols. 474-476

Abstract: The tooth profile synthesis of swing movable teeth drives was performed. The tooth profile equation of the internal teeth ring was established. The analysis result shows the deformation distribution of the movable tooth in the normal direction at the contact point of the wave generator is a sine function. Furthermore, the forces of the wave generator, the movable tooth pin and the internal teeth ring acting on the movable tooth were analyzed. Based on the Hertz theory and material mechanics, the contact strength calculation methods for the meshing pairs of the movable tooth and the wave generator as well as the movable tooth and the internal teeth ring were discussed. The calculation method for the bending strength of the pin was also derived. The research result provides a theoretical basis for designing and applying swing movable teeth drives.

Abstract: This paper introduced a dual description logic for relations, in order to represent the difference of tuples and attribute values. In the logic, concepts are classified into two classes as follows: tuple-concepts and attribute-value concepts. This paper firstly gives the logical language, syntax and semantics of the logic, and secondly defines a transformation of a relation in a database into a knowledge base in the dual description logic, and last proposes a transformation of a model for the dual description logic into a relation.

Abstract: The soil samples in a profile were collected around the pyrite slag pile site near a sulfuric acid plant in Guangdong province and the contents of lead were investigated detail. At the same time, the mechanism of lead pollution was principium analyzed. The research found that the lead pollutants were mainly concentrated in soils surface layer about 0-10cm and shown characteristics of contents rapidly decreasing along the uprights. the main factors that affected the transference of lead from the slag to the soil were the filtering by acid rain and itself acidification of the slag. Iron oxide colloid and organic matter may have been responsible for the lead retention in soil.

Abstract: Due to the need to reduce electronic device sizes, it is very important to consider the depth distribution of ions implanted into a crystalline target. The mean projected ranges and range straggling for energetic 150 – 500 keV Er ions implanted in single crystal silicon (c-Si) at room temperature were measured by means of Rutherford backscattering followed by spectrum analysis. The measured results are compared with other experimental data for amorphous Si (a-Si) and Monte Carlo code (SRIM2006) predictions. Our results show that, although the experimental values for range and range straggling exceed the SRIM calculations, they are nevertheless consistent with trends that have been previously observed for a-Si.

Abstract: For the existing certification that ignores trust relationship between inter-domains will lead to the certification failure phenomenon, in the consideration of trust relationship circumstances this paper presents an alliance certification scheme based on the lattice combining Dijkstra path search algorithm between the domains. Theoretical analysis shows that dual-traction certification mechanism greatly increases system security, also avoids the single point collapse. According to calculating the path weight by Dijkstra algorithm to find the shortest path in the weighted graph, the scheme can improve the certification efficiency.

Abstract: The paper developed a method of tools AE signal feature extraction based on wavelet packet analysis, we used wavelet packet analysis to decompose acoustic emission signals for different frequency range of the signal components. The will occupy of the main energy of AE signal frequency range is extracted as the recognition feature vector of tool wear. The method has higher accuracy according to experiments.

Abstract: Water-based infrared ray shielding coating, that is, nanometer metal oxide is added to the water-based paint, which has anti-IR features without affecting the transparency of the paint. In this paper, the nanometer oxides are prepared by sol-gel method, added into polypropylene sour. In order to improve the infrared ray shielding of the thin film, two kinds of nanometer oxides are added into the polypropylene sour with different volume ratios, the shielding performance of the paint is studied. Experimental results show: in the 8000 ~ 4000cm^-1 range, the transmittances of infrared ray is 30% to 75%; in 4000 ~ 400cm^-1 range, transmittances decrease significantly; 3% ZnO, 3% Fe₂O₃, 3% Y₂O₃, 2% Al₂O₃ are the best mass ratio of every single nanometer oxide; the infrared shielding rate of Fe₂O₃ and Y₂O₃ mixture with the volume ratio of 1 to 4 is better than Fe₂O₃ and Y₂O₃ single.

Abstract: Landscape characteristics and dynamics change are studied based on RS and GIS from 1993 to 2007. The results show that there is a big change in Tangshan Nanhu wetland subsidence in the last 15 years. Construction land, water bodies, woodland regional landscape pattern instead of the landscape of construction land and farmland. The change is caused by mining production and land reclamation activities mainly. Take the forest cover index, grass cover index, wetland index, index of landscape heterogeneity, landscape diversity, biological abundance index and Poor index of ecological as assessment index, use analytic hierarchy process to determine the weight of indexes, evaluate Nanhu area eco-environmental quality. The results show that: From 1993 to 2000, there is a slight decline in environmental quality; and since 2000, environmental quality has become better and better.

Abstract: Sheet metal stamping processes design is not a trivial task due to the complex issues to be taken into account. Therefore, proper design methodologies to reduce times and costs have to be developed mostly based on computer aided procedures. This paper presents a methodology to effectively determine the optimal process parameters using finite element analysis (FEA) and design of experiments (DOE) based on Metamodels. The idea is to establish an approximation function relationship between quality objectives and process parameters to alleviate the expensive computational expense in the optimization iterations for the sheet metal forming process. This paper investigated the Kriging metamodel approach. In order to prove accuracy and efficiency of Kriging method, a nonlinear function as test functions is implemented. At the same time, the practical nonlinear engineering problems such as square drawing are also optimized successfully by proposed method.

Abstract: Explore the relationship between hypertension and metabolic syndrome, and treatment strategies. On the relationship between hypertension and metabolic syndrome were analyzed retrospectively, and how to conduct clinics for certain summary. Metabolic syndrome and hypertension exists a close relationship. Hypertensive patients with low HDL-C and high LDL-C level; whether oxidized LDL is high value or low value, MS group the incidence of cardiovascular disease is always higher than non-MS group. MS in blood pressure is an important component of integrated control of MS, can effectively prevent the occurrence of cardiovascular events and diabetes.