Applied Mechanics and Materials Vols. 29-32

Abstract: The state of pedestrian flow was observed for public assembly place exit. The basic parameter data of evacuation simulation obtained from the experiment. A compared result of evacuation experiment of special scene and evacuation simulation revised model parameters. Revised model simulated pedestrian evacuation was carried out in typical public assembly place. Research results of this paper provide scientific basis for exit design, risk analysis and emergency management.

Abstract: Motorcycle Ride Comfort is the important performance of motorcycle. In this paper, a rigid-flexible coupling virtual prototype is developed with CATIA, ADAMS and NASTRAN tools. Combined with motorcycle road simulator, the simulation platform of motorcycle ride comfort is built. Then with the input of pulse road, motorcycle ride comfort is simulated, and the simulation results are verified by experiment results. It indicates that the simulation results have a high credibility and the road simulator provides a good method of verification for simulation of motorcycle ride comfort.

Abstract: Under simulated physiological loading state (walking and running), cattle femur’s SGP was tested by INSTRON (8847) tester. Strictly speaking, the specimen was a large bone structure. Experiment results imply that human femur will also have voltage signals under the state of walking and running, and the voltage amplitude will become larger with the load and frequency increases. In addition, running’s voltage amplitude is larger than that of walking.

Abstract: Simulations on two-phase cavitating flows containing water and vapor, on axisymmetric body with disk cavitator have been implemented through the cavitation model in Fluent 6.2, the flow field around cavitator under different incoming conditions is studied respectively, and analyses to parameters pertinent to cavity including dimension, streamlines, vapor volume fractions and pressure distributions along the body surface are given when the incoming cavitation number ranges from 0.3 to 0.8, the results show that the vapor volume fraction and threshold phase-change pressure within the cavity under the same cavitation number gradually ascends as the Reynolds number increases ; the effects of incoming pressure on threshold phase-change pressure inside the cavity is insignificant.

Abstract: In this paper, we present the generalized relaxed SSOR method (GRSSOR) for solving the large sparse augmented systems of linear equations, which is the extension of SOR-like, GSOR and GSSOR methods. Furthermore, convergence of GRSSOR method for augmented systems is analyzed, which show that GRSSOR method with appropriate parameters will have very good effectiveness

Abstract: For analysis of influence factors on heavy metal release from different weathering mine waste rock in Fu Xin mine area under the effect of rain water leaching, the materials which come from mine waste rock pile nearby Xin Qiu mine is collected and then process a serial leaching experiments. The initial PH value of leaching solution and experiment temperature have been selected to as influencing factors according to rainfall and weather condition of Fuxin mining area. The concentration of five heavy metal elements: Cd, Cr, Cu, Mn and Pb are tested in leaching solutions. The results show that the constituent characteristics of stratum rock is a major factor influenced on leaching solutions and heavy metal release. The weakly acidic leaching solution becomes to weakly alkaline after leaching the waste rock. The quantities of different heavy metal release represent disparate rules, influenced by distinct weathering degree. Concentrations of Cd and Cr increase with the leaching solution's pH value variation while Cu, Mn and Pb decreased. Higher temperature leads more heavy metal elements release from the waste rock.

Abstract: The genetic optimization (GO) is employed to solve the Traveling Salesman Problems (TSP). Instead of the global fitness of the individuals, it calculates the local fitness of each gene in GO. Based on the local fitness, worse gene are selected and modified for better fitness. With the improvement of local fitness, the global fitness is improved. The algorithm is implemented for well-known benchmark cases, and the simulation results have shown the infeasibility and effectiveness of the algorithm.

Abstract: A multiparty quantum determined key distribution protocol using open-destination teleportation is presented in this paper. Four parties can build a key using the technology of open-destination teleportation. Unlike in the previous protocols in which the key is a random string built in the process of key distribution, the key can be a determined string in our protocol. We prove that our protocol is guaranteed to be unconditionally secure by the laws of quantum mechanics.

Abstract: Bullet identification is a complicated work which demands high accuracy rate. In this paper, we try to find a reliable and fast automatic bullet identification algorithm using image processing technology. The key and most difficult step is to find an image feature which can describe the unique striation pattern on the bullet. When we do bullet identification by human-eye, we try to best match the striations of the bullets. It’s mainly according to the order of the striations and the distance between them. Based on this principle, a new algorithm for automatic bullet identification is proposed. Using the bullet’s visual graphic set which is offered by the Three-Dimensional Laser Color Scanner (3DLCS), we firstly do pre-processing to the bullet unwrapped image, such as image enhancement, edge detecting, binarization, thinning and denoising, to obtain an image with clear striations and low noises. Then we find an effective image feature based on the principle of human vision: the bullet feature vectors (BFVs). According to actual needs, we give a reasonable definition for vector distance (VD) between vectors of different dimensions, and take VD of BFVs as a measurement for bullet similarity. Experimental results prove that our algorithm can correctly find the bullets with high trace similarity and do bullet identification successfully.

Abstract: This paper has researched and analyzed on the fractal dimension calculating method and selected Peleg Carpet Covered algorithm which is fit for fractal physiognomy analysis to research. Aiming at the shortage of Peleg Carpet Covered algorithm, an improved Carpet Covered algorithm is proposed. By experiment, the performance of original algorithm and improved algorithm is compared and validated, and the results show that improved algorithm has improved the calculating accuracy and texture-differentiating ability. Applying this algorithm to fractal topography creating can make the fractal topography model be alike to genuine physiognomy.