Applied Mechanics and Materials Vols. 58-60

Abstract: In this paper, an SIQS epidemic model with infection age and generally nonlinear contract rate is formulated. The existence and asymptotic stability of equilibrium are respectively discussed, and a general condition is obtained under which the endemic equilibrium is exponentially asymptotically stable.

Abstract: Streaming program is an important application of large-scale parallel processing. The common parallel method for streaming program is not suitable for many-core architecture. For the streaming programs, this paper proposes a novel mapping method based on hardwire architecture. The method uses SPM (Scratch-Pad Memory) to transfer the data. Thus, the number of accessing shared Cache is reduced and the cost of communication is also reduced. The experimental results show the effectiveness of the method.

Abstract: To interpret the role of information technology (IT) in China’s economy, the paper focuses on examining the growth contribution from information technology with Production Probability Frontier and Dual Method during the period from 1980 to 2003. Our results indicate that the Chinese economic growth rate devoted to IT investment has risen steadily since 1990. The contribution share of total factor productivity (TFP) from IT in China has increased sharply after 1995, while the TFP growth rate from non-IT sector dropped at that period.

Abstract: While researches focused on the role of information technology in Chinese economic growth in recent years, there has little research on comparing China’s IT contributions with other countries. The paper examined IT contribution in China with Production Probability Frontier and Dual Method, and compared it with the results of the United States and Japan. The results of the paper add to our understanding of how IT affects economic growth, and its value in economy.

Abstract: The resources problems, caused by the coal construction projects in our country, brought about an increasing pressure to the coal production and many hidden troubles to social economic development. The article according to the development tendency of coal resources in our country, discussed coal resources as a rare and drain resources. At the same time, the paper puts forward Sustainable Development of coal resources; then builts an evaluation system of coal construction project on the basic of Sustainable Development. The purpose of the system was to direct the development of coal construction projects, finally come to the Sustainable Development of resources, economic and society.

Abstract: The life estimation of car hub bearing is based on the life theory of Rolling bearing, axis load and radial load every column bearing of hub bearing were solved out by establishing dynamic model of car hub bearing, and general calculation way of rated dynamic load and equivalent dynamic load was inferred out, then the paper given out the life estimation way of car hub bearing. In the end, an example is used to explain the durability life estimation process of car hub bearing.

Abstract: In this study TIG welding was carried out in Ti-15V-3Cr-3Al-3Sn alloy by using Ti-6-4 alloy filler. The effect of two common industrial heat treatments (artificial aging treatment at 593°C/2hr /air cooling or a solution treatment at 788°C/30min/air cooling plus aging at 510°C/8hr/furnance cooling) on the microstructure, mechanical property and corrosion resistance of weldment were investigated. It appears that these post weld heat treatment result in enhanced mechanical property as well as its corrosion resistance. In addition, solution plus aging treatment presents the excellent mechanical property and corrosion resistance. TEM investigation is also carried out to observe the nano size precipitates in heat affected zone (HAZ) and fusion zone (FZ). The possible enhanced mechanisms are discussed.

Abstract: Passive AKPs being currently in use do not respond to the needs of daily living activities of many amputees. For example, it is difficult to climb stairs with natural posture and to adjust the stiffness of the knee joint motion during the swing phase. Therefore this paper proposes the instantaneous center with variable rotating multiaxial knee, the multiaxial four league rod mechanism composition, have bionic similarity, involving active knee mechanism design and experiment. Artificial limb main part is through motor based on active control knee flexion knee actuator.This paper was designed by the ball screw electric a new initiative knee institutions.

Abstract: Based on the theory of Bi-level Programming, according to the location and the fluctuant power and heat demand of the customers in the given region, taking the minimum cost of the regional energy supply as objective function, a bi-level programming model was formulated to plan the regional distributed energy supply chain network. A hybrid algorithm of a tabu search algorithm combined with k-means algorithm and a simulated annealing algorithm combined with scanning algorithm has been provided to solve the model. Finally with practical instances we proved the validity of the approach.

Abstract: Welded connection is a joined form in practical engineering. This text introduces the relevant contents of eccentrically loaded welded connections in AISC design code, Specification for Structural Steel Buildings, 2005, and arrives at conclusions which civil engineering technicians consult.