Applied Mechanics and Materials Vols. 121-126

Abstract: The essay analysizes existing typical problems in current teaching of Molding Design, and raises a set of teaching innovation to meet practical needs. In the change, the author strengthens the process and guidance for molding, which obviously triggers students’ interests in study. By the innovation, we get satisfactory results.

Abstract: In the simulation, the mesh quality has a significant impact on the simulation results. To study the influence of the size and shape of target mesh on the high velocity projectile penetration into concrete, using ANSYS/LS-DYNA software in this paper, different target mesh side lengths are selected to simulate, the variation curve that depth of penetration (DOP) with target mesh side length is obtained, select 1/6 times projectile radius as the target mesh side length can meet the accuracy requirements. Based the target mesh side length above, different radios of the mesh side length in the radial direction to the side length in the axial direction are selected to simulate, the influence law of calculating results that depend on the mesh shape is acquired. The contrast validation of experimental results is carried out, the simulation results are in agreement with the experimental results.

Abstract: On the basis of the studies done by scholars at home and abroad,we have a research on macroeconomic performance , regional economic development and efficiency of Weifang City based on the regional economic and industrial economic theory , And make an analysis of the industrial structure, state and existing issues of Weifang City based on it; Through a method of comparative , we analysis the internal structure’s change of Weifang City’s economic and advantages in geography in Shandong Province , have an analysis of the typical factor which affect its efficiency level, find the future position of regional economic development in Weifang City based on it . At last, made the corresponding policy recommendations to the regional economic development and industrial system optimization of the Weifang City.

Abstract: Runway debris visual automatic detection system is one of key measures that ensure efficient and safe airport operation. It can automatically recognize runway debris with visual detection methods, and determine the orientation of scanning system with attitude estimation method, then realize automatically detect debris. In this paper, the recognizing method of fixed feature navigation lights that are used to calculate system orientation are researched on. Runway area and background are detached by recognizing runway lines. Navigation lights are recognized and matched by the method of image matching. Experimental result show, runway can be separated and recognized from complex environment, and navigational lights can be matched quickly in the algorithm. The reliable fixed feature is supplied for followed determining scanning system orientation and located debris.

Abstract: Solder joint shape refers to geometry that molten solder can be achieved with spreading and wetting along the metal surface in the junction between components solder pins and printed circuit board (PCB) pad, to the metal surface contact angle and solder fillet shape[1]. BLP (Bottom Leaded Plastic) [2] which is not a type of thin out-line surface mount device(SMD) without the side lead is widely used in manufacturing of new generation memory such as SDRAM \ RDRAM \ DDR. For this non-lead SMD, the shape and reliability of solder joint is the focus of the study. In this paper, we select the C-BLP of 28-pin device as the research object, complete the forming model of solder joint shape based on minimum energy principle and the solder joint shape theory by using Surface Evolver software, and analyze two critical process parameters (solder volume and solder pad width ) impacting on the solder joint shape. The study results show that the solder volume and pad width have a significant impact on the three-dimensional shape of BLP solder joint. The law of which is that: in the case of the other fixed parameters, as the increase of the solder volume, solder joint surface gradually changes from the relatively flat to the convex, solder joint gradually changes from the completely soldered to the partly soldered in the pad connections, and solder joint heights are gradually decreased; in the case of the other fixed parameters, as the increase of the pad in width, the solder joint surface gradually changes from the convex to the flat, solder joint gradually changes from the completely soldered to the partly soldered in the pad connections, and solder joint heights are gradually decreased. The actual solder joint shape designs of BLP devices can be instructed based on predicted results.

Abstract: Based on the work at home and aboard.We evaluate the efficiency of group ownership of state-owned enterprises with the method of data envelopment analysis . And through "projection principle" can be achieved given its theoretical peak. We obtained the actual efficiency through the actual data after the DEA analysis of the group ownership of state-owned enterprises in Shandong Province in 2009.Given the appropriate management and economics analysis,and effective ways for business decision makers to evaluate and improve understanding of such enterprises the optimization of resources between various departments and coordination. It has a strong theoretical and practical application.

Abstract: As the synthetic aperture has been widely used in remote sensing and imaging system. Various methods have been used to enhance the imgaing speed of the system. Optical method has been proved to have the high imaging speed in processing microwave signals. The received signal can be modulated in optical carrier by the electro-optic amplitude modulation. The optical signal is processed by relevant optical instruments. The article compares the new electro-optic imaging system with the original system. The principle of the new system has been proved to be similar with the original system. The structure of the new system has been verified to have the possibility to realize real-time imaging. The key point of the new system has been analysed and the main challenge in the new system has been checked in the article.

Abstract: By combining the domestic and overseas research experience in tax risk management, based on all personnel and whole flow thought, this paper divides tax risk into tax sources risk, enforcement risk, administrative risk and independent risk according to objects and processes of occurrence, and designs tax risks early warning system to dynamically monitor, early warn four types tax risk and constantly provide various risks analysis reports. This paper provides a information means for the post personnel at various levels of Xi’an Local Taxation Bureau to prevent tax risk.

Abstract: In accordance with the Coupling vibration absorber system, introduced to reduce the vibration of the wheel loader at driving, designed are two dynamic models for the loaders either with the application of vibration absorber system or without that of it. The simulation analysis of the vibration reduction, with the help of the simulation software Matlab/ Simulink, shows that the vibration absorber system may reduce not only the vehicle vibration effectively but also that of the work device, thus providing the basis for the further research and development of the riding control system.

Abstract: The analytical solution to the problem of the scattering of SH-wave by isosceles triangular hill in right-angle plane is given by using the methods of complex function and multiple coordinate. Firstly, the solution region is divided into two domains, where domain I involves isosceles triangular hill and a semi-circular bottom, domain II involves a semi-circular hollow in right-angle plane. And a standing wave function is constructed which satisfies the zero-stress conditions at the triangular wedges. In domain II, the scattering wave functions which satisfy the stress free boundary conditions at the free surfaces for the right-angle plane are constructed. Secondly, based on the conditions of the displacement continuity and stress continuity at the “common border” in the domains, a series of infinite algebraic equations are given and solved by truncation. Finally, some examples for amplitude of displacement on the surface are given. Numerical results show that amplitude of displacement on the surface is influenced by isosceles triangular hill.