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To study the effect of tempering temperature on strain hardening exponent and flow stress curve, one kind of 1000 MPa grade low carbon bainitic steel for construction machinery was designed, and the standard uniaxial tensile tests were conducted at room temperature. A new flow stress model, which could predict the flow behavior of the tested steels at different tempering temperatures more efficiently,...
To find out solutions to automatic collision avoidance with multiple targets, which would promote ship automation and intelligence, the basic principle of velocity obstacle theory was applied for the own ship to avoid collision with multiple moving or static targets. The principle of ship collision avoidance was analyzed and solution of demanded course for the own ship to navigation with at current...
A novel microwave undulator based on TE01 mode which has large field capacity of the cavity is proposed. The dispersion relations between electrons and backward wave (BW) and forward wave (FW) are studied. The equivalent period and magnetic field to the magnetic undulator are derived. A forward wave undulator at 110GHz is designed by PIC (Particle in Cell) simulation and the results are identical...
As soldering process is a high temperature phenomenon accompanied by surface reaction kinetics, the computational model for solder bubble growth can be a strong arena for describing those aspects which are otherwise difficult to be understood through the experimental methods. In this paper, the growth of gaseous bubbles in the molten tin solder has been modeled using finite element method. The advection-diffusion...
As soldering process is a high temperature phenomenon accompanied by surface reaction kinetics, the computational model for solder bubble growth can be a strong arena for describing those aspects which are otherwise difficult to be understood through the experimental methods. In this paper, the growth of gaseous bubbles in the molten tin solder has been modeled using finite element method. The advection-diffusion...
In order to solve the parallel algorithm for Petri net system with concurrent function, to realize the parallel control and execution of Petri net, two different functional partition strategies based on P- invariant and T- graph are proposed for the parallel algorithm of Petri net system. Firstly, after the analysis of Petri net model and concurrent function, the basic idea of P/T network system function...
In order to solve the parallel algorithm for Petri nets system with concurrent function, to realize the parallel control and execution of the Petri nets, the Petri nets parallel subnets conditions were proposed, that provides the theory basis for judging P- invariant whether was the parallel subnet. Firstly, we according to the concurrent character of Petri net model, to analyze the parallelism of...
Vegetable is an important agricultural export products of China. Japan is the one of main export countries of Chinese vegetable trade. Over the past few years, the technical barrier trade becomes the main reason to prevent our agricultural products from the exports to Japan. The paper employs the gravity model to do an empirical analysis using the data of Japan and Chinese from 2003 to 2006, then...
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