Applied Mechanics and Materials Vols. 58-60

Abstract: Based on the mixed and heterogeneous constellation characteristics of the COMPASS navigation system, the weighted dilution of precision (WDOP) is applied to analyze the positioning geometric strength, and the results are compared with the geometric dilution of precision (GDOP) of GPS and Galileo navigation constellation. Aiming at global and regional users, the difference between the positioning performances of various user groups are presented, indicating that the COMPASS constellation possesses remarkable advantages in both the visibility and the positioning geometric strength for regional users. The loss of the positioning performance under the circumstance of individual satellite malfunction of the COMPASS constellation is also discussed, and simulations show that the absence of GEO satellites has the largest impact on the China region.

Abstract: Rationality of the industrial structure is the essence of the economic development, as well as the key to promote the sustainable, steady, and harmonious development of the economy. Guided by the Scientific Development Concept and Sustainable Development Theory, this article has probed into the building of a rational evaluating index system of the industrial structure. It proposes a reasonable choice criterion of the industrial structure, which is based on the sustainable development with the coordination of “economy, society, resources, environment, and technology”. Accordingly, a set of rationale evaluating index system is designed, laying the foundation for the overall evaluation and measurement of the rationality level of the regional industrial structure.

Abstract: Industrialization, information technology is a process of change of social capital. China's traditional social capital are mainly within the family, we must carry forward the expansion of traditional ethics and trust radius, The formation of the general trust in market economy, civil society organizations to promote the formation of modern social capital. Our government has an important role in formation of social capital.

Abstract: Сylinder head bolts’ tightening torque had a direct impact on engine body vibration. With necessary vibration test hardware, we applied the software of NI LabVIEW to develop engine vibration data acquisition and analysis, data fitting procedures, and took 6135K-13 diesel engine as a research object, on the basis of the given vibration test program, we analyzed and processed the sampled vibration data, studied and validated the quantitative relationship between cylinder head bolts’ tightening torque and engine body vibration.

Abstract: Demographic dividend has contributed a lot to Chinese economic growth during the past 30 years. However, in recent years, the increase of population dependency ratio, with the constant “shortage of labors”, indicates that the traditional demographic begins to fade away. How to further search for the rest of the demographic dividend and defer the disappearance of the demographic dividend becomes a significant issue. It researches province regions on the degree of utilization of existing demographic dividend, which will be instructive for the relevant economic policies of making full use of the demographic dividend. In terms of contribution analysis, this present research is concerned with the postponement of demographic dividend and the influence on Chinese economic growth rate by human capital changes.

Abstract: Auctions usually involve the sale of many homogeneous or heterogeneous objects. Spectrum, treasury, and electricity auctions are examples. This kind of auctions is so-called multi-unit auctions. In order to know the research history and the newest research trends for the study on multi-unit auctions, this paper presents widespread theoretical and applications problems of multi-unit auctions. The multi-unit auction models are divided into two kinds (i.e. sequential auction and simultaneous auction). Assumptions, main ideas, and conclusions of literature related to these two kinds of models are reviewed and commented.

Abstract: In new product development, the asymmetric information between the firms and developers is inherent. It always leads to failure for choosing the developers. If a firm selects the wrong developer with shortcomings in the team, technology, market, etc, then it will lead to the deviation from the expected results in the development of new product in terms of performance, cost and schedule, and cause imponderable financial loss. This paper presents an incentive optimal model of choosing the developers in new product development based on multi-attribute auction. Then the firm can incentive developers reporting the real information, and choose the optimal developers.

Abstract: The bending problem of elastic bimetal beam simply supported under homogeneous load has been investigated. A theoretical model has been used for analysis of the problem. The analytic solution has been given and compared with the corresponding results from finite element analysis. The research shows that the present applied theoretical model has good precision for analyzing bending problem of elastic bimetal beam.

Abstract: Work out control measures for pillar upward mining of left-over coal, in view of coal floor movement, this paper analyzes theoretical foundation and mechanical properties of mechanical model on coal floor movement of rock strata between coal seams in pillar upward mining of left-over coal and presents a simplified corresponding mechanical condition. Taking into the relation between layer movement and time consideration, the PTh model is used to show its rheological properties. By using a two-dimension model, mechanical model of coal floor movement is set up and both ends of cantilever beam are fixed. Finally, subsiding partial differential equation is induced at different districts in pillar upward mining of left-over coal. After solving the equation, prediction model about law of coal floor movement at different districts is gotten in pillar upward mining of left-over coal, which provides a theory basis for further study on upward mining.

Abstract: This paper studies multiple suppliers’ supply chain scheduling problem. A precise mathematical scheduling model is first built. Moreover, based on the optimal condition analysis, one problem related to the objectives of minimize the number of tardy jobs has been investigated. Furthermore, the corresponding dynamic programming method has been presented. These algorithm has been proved to be efficient by showing its pseudo-polynomial complexity.