for large scale matrix computing the trace of function of the matrix is expensive.Re- cently an effective algorithm based on Monte Carlo method and Gauss type quadrature rule was de- veloped .In this paper,we analyse ...for large scale matrix computing the trace of function of the matrix is expensive.Re- cently an effective algorithm based on Monte Carlo method and Gauss type quadrature rule was de- veloped .In this paper,we analyse condition number of this problen,estimate the error of the algo- rithm and give a modified algorithm.In our algorithm the relative error is controllable.展开更多
Tension and shear tests are carried out on composite cross-joints, produced by resin transfer moulding (RTM), stitch-RTM and cobonding techniques separately, to investigate the influences of different production metho...Tension and shear tests are carried out on composite cross-joints, produced by resin transfer moulding (RTM), stitch-RTM and cobonding techniques separately, to investigate the influences of different production methods on their mechanical properties and their failure mechanism. It is concluded from test results that, in terms of mechanical properties, the RTM-made cross-joint holds superiority over other two, and both stitch-RTM and cobonding methods have significant adverse effects on mechanical proper- t...展开更多
The new technology of geomorphology visualization modeling and virtual reality for tidal current numerical simulation are the important methods utilized in coastal ocean research. In the project of studying the evolut...The new technology of geomorphology visualization modeling and virtual reality for tidal current numerical simulation are the important methods utilized in coastal ocean research. In the project of studying the evolutionary trend of radial sand ridges in South Yellow Sea of China, this method becomes the key to reveal the correlation betweenthe seabed topography and the hydrodynamic factor——tidal current. It is proved that using the geomorphology visualization and tidal virtual reality techniques, oceanog-raphers might be able to intuitively discover the interaction pattern of sand ridges and tidal current, predicting the development of sand ridge stability in the future. Furthermore,a prototypic software system——VROcean was designed andimplemented to examine the performance of the new visualization technology on the contrast to traditional methods.展开更多
文摘for large scale matrix computing the trace of function of the matrix is expensive.Re- cently an effective algorithm based on Monte Carlo method and Gauss type quadrature rule was de- veloped .In this paper,we analyse condition number of this problen,estimate the error of the algo- rithm and give a modified algorithm.In our algorithm the relative error is controllable.
文摘Tension and shear tests are carried out on composite cross-joints, produced by resin transfer moulding (RTM), stitch-RTM and cobonding techniques separately, to investigate the influences of different production methods on their mechanical properties and their failure mechanism. It is concluded from test results that, in terms of mechanical properties, the RTM-made cross-joint holds superiority over other two, and both stitch-RTM and cobonding methods have significant adverse effects on mechanical proper- t...
基金This work was conducted as part of the production of the research projects supported by the National Natural Science Foundation of China (Grant No. 49701013) the Chinese National Institutes of Technology (Grant No. 96-922-03-01).
文摘The new technology of geomorphology visualization modeling and virtual reality for tidal current numerical simulation are the important methods utilized in coastal ocean research. In the project of studying the evolutionary trend of radial sand ridges in South Yellow Sea of China, this method becomes the key to reveal the correlation betweenthe seabed topography and the hydrodynamic factor——tidal current. It is proved that using the geomorphology visualization and tidal virtual reality techniques, oceanog-raphers might be able to intuitively discover the interaction pattern of sand ridges and tidal current, predicting the development of sand ridge stability in the future. Furthermore,a prototypic software system——VROcean was designed andimplemented to examine the performance of the new visualization technology on the contrast to traditional methods.
