Applied Mechanics and Materials Vols. 55-57

Abstract: Digital coupon, a popular e-commerce application, which makes the coupon circulating on internet by the digital forms. The real commercial system hasn’t presented yet in current domestic. The problem lies in the e-business model, anonymous, fair transaction, and free circulation. In this research, the author analyzed the domestic and foreign researches, defined the e-business model of mobile e-coupons, puts forward a set of digital coupon protocols with offline presentation, offline payment, and verified the anonymous, fair transaction, free circulation of the protocols. This study derived a test system has good efficiency, implementation, practicability and innovative. The obtained theory and experience can be a meaningful reference to other studies in relevant fields.

Abstract: The network communication system is presented for controller of AT91SAM9261 architecture which is based on ARM926EJ-S core, modular design concept is given by the each har­d­ware related module and driver design. High processing speed of the system on the basis of this system can be extended .

Abstract: The objective of the present paper is to investigate the condenser heat recovery in water-cooled chiller system. According to the technology characteristics of vapor compression refrigerating cycle, the viewpoint of condensing heat reclaim was proposed, and heat recovery system can be used in buildings. Air-cooled and water-cooled chillers with heat reclaim capability were discussed. Three optimized water system designs were introduced for more heat recovery or higher heating water temperature. The results show that it is very useful for designing and developing the new heat recovery unit with high efficiency, energy conservation, and environmental protection by analyzing the feature feasibility of condenser heat recovery system. The control of entering-condenser water temperature is recommended for higher chiller efficiency and operating steadily, the water system designs of preferential loading and side stream are for more heat recovery.

Abstract: The effects of complex modifier (consisted of mixed rare earth oxides and CaCO₃) on microstructure in Mg₂Si/A1-Si composite are researched. The results show that the morphology of Mg₂Si particle changes from irregular or crosses to polygonal shape, and its size obviously decreases. The modifier presents the better modification than mixed rare earth oxides or CaCO₃.

Abstract: In the measurement of water content of crude oil inside pipeline, the traditional electromagnetic conductance sensors cannot achieve the measurement of water content due to the influence of pipeline closure and electromagnetic shielding. In theory, the double-coil array electromagnetic conductance sensor can obtain the measurement of water content with low frequency sine signal as the motivation. However, its longitudinal resolution is too low and the characteristic is poor. The four-coil model has been established so as to improve the sensor vertical resolution. The simulation results indicate that the useful signal is concentrated in the internal of main coils, which plays a good role of longitudinal focus.

Abstract: A method for comprehensive dynamic balance of mechanism based on the particle swarm optimization is presented. This paper adopted nonlinear multi-objective programming method to carry out a study on three dynamic property indexes including inertia force, reaction of kinematic pair and input torque. Optimum solution for the parameters estimation problem based on the particle swarm optimization algorithm is obtained by constructing a fitness function of the mathematical optimization model, which consists of those property indexes. The simulation results indicate that the proposed method could eliminate the reluctant evaluations and interactions remarkably, thus improves the application's performance.

Abstract: In this paper, we consider a new model of newsboy problem with uncertain variables under budget constraint. Since the demands of products are often uncertain in real life, the profit of the newsboy is uncertain. We develop expected profit model and investigate its deterministic equivalent class. In the model, the objective function is to maximize the expected profit of newsboy and the chance of achieving a target budget satisfies chance constraint with at least some given confidence level. Furthermore, a hybrid intelligent algorithm which integrates genetic algorithm and 99-method is designed for the model. Finally, an illustrating example is given to show the application of the proposed model and algorithm.

Abstract: The service performance of suppliers is key concerns for the enterprises in recent years, and there are lots of methods to evaluate the performance of suppliers, especially for the automotive company. This paper preliminary analyzed the literatures of the suppliers’ evaluation, and summarized the main contents and methods used to evaluate the suppliers of automobile enterprise which are being focused on by many scholars. And then, the actual case is applied , a automobile enterprise has built 22 indexes to evaluate the performance of its parts suppliers in China, by use of SPSS, the results of parts suppliers evaluation were analyzed. The overall supply capacity remained stable, to some extent, declined partly, the joint venture company (in China) got the lowest mean, which have the remarkably difference from the private company and the joint venture company (out of China). So it is crucial to take the further measures to improve the service and product quality of these two parts suppliers.

Abstract: In this paper, a novel netted radar system is designed to reduce the influence of mutual interference between signals. The emission signals of all stations are assigned the orthogonal PN codes. Because of the good autocorrelation and cross-correlation properties, mutual interference becomes weaker and signals from different stations could be separated by the preassigned PN codes. At the same time, the spectrum of the emission signal is spreaded, the peak-to-mean envelope power ratio (PMEPR) and the intercepted probability of the signals descend therefore. Simulation results show the good performance of the proposed approach.

Abstract: At present, most of the robots’ intelligent level is not as high as needed and they can’t accomplish some special tasks successfully under complicated circumstances. A kind of robot master-slave control system based on LabVIEW is designed, which allows operators control robots working in dangerous environment such as high radiation, ultrahigh temperature through outside input device. The device should connect with the master computer. This kind of operation mode can not only make full use of human intelligence, but also exploit the robots’ ability of being able to work in the abominable environments, making human and the robot fully complement each other's advantages. At the same time, the robot master-slave control system based on LabVIEW is easy to develop and maintain for its good portability and scalability.