An approach of limit state equation for surrounding rock was put forward based on deformation criterion.A method of symmetrical sampling of basic random variables adopted by classical response surface method was mende...An approach of limit state equation for surrounding rock was put forward based on deformation criterion.A method of symmetrical sampling of basic random variables adopted by classical response surface method was mended, and peak value and deflection degree of basic random variables distribution curve were took into account in the mended sampling method. A calculation way of probability moment, based on mended Rosenbluth method, suitable for non-explicit performance function was put forward. The first, second, third and fourth order moments of functional function value were calculated by mended Rosenbluth method through the first, second, third and fourth order moments of basic random variable. A probability density the function(PDF) of functional function was deduced through its first, second, third and fourth moments, the PDF in the new method took the place of the method of quadratic polynomial to approximate real functional function and reliability probability was calculated through integral by the PDF for random variable of functional function value in the new method. The result shows that the improved response surface method can adapt to various statistic distribution types of basic random variables, its calculation process is legible and need not iterative circulation. In addition, a stability probability of surrounding rock for a tunnel was calculated by the improved method, whose workload is only 30% of classical method and its accuracy is comparative.展开更多
We study the translocation of a protein-like chain through a finite cylindrical channel using the pruned-enriched Rosenbluth method （PERM） and the modified orientation-dependent monomer-monomer interaction （ODI） m...We study the translocation of a protein-like chain through a finite cylindrical channel using the pruned-enriched Rosenbluth method （PERM） and the modified orientation-dependent monomer-monomer interaction （ODI） model. Attractive channels （εcp = -2.0, -1.0, -0.5）, repulsive chanaels （εcp： 0.5, 1.0, 2.0）, and a neutral channel （εcp =- 0） are discussed. The results of the chain dimension and the energy show that Z0 ： 1.0 is an important case to distinguish the types of the channels. For the strong attractive channel, more contacts form during the process of translocation. It is also found that an external force is needed to drive the chain outside of the channel with the strong attraction. While for the neutral, the repulsive, and the weak attractive channels, the translocation is spontaneous.展开更多
基金Project(50378036) supported by the National Natural Science Foundation of China Project (200503) supported by the Foundation ofCommunications Department of Hunan Province, China
文摘An approach of limit state equation for surrounding rock was put forward based on deformation criterion.A method of symmetrical sampling of basic random variables adopted by classical response surface method was mended, and peak value and deflection degree of basic random variables distribution curve were took into account in the mended sampling method. A calculation way of probability moment, based on mended Rosenbluth method, suitable for non-explicit performance function was put forward. The first, second, third and fourth order moments of functional function value were calculated by mended Rosenbluth method through the first, second, third and fourth order moments of basic random variable. A probability density the function(PDF) of functional function was deduced through its first, second, third and fourth moments, the PDF in the new method took the place of the method of quadratic polynomial to approximate real functional function and reliability probability was calculated through integral by the PDF for random variable of functional function value in the new method. The result shows that the improved response surface method can adapt to various statistic distribution types of basic random variables, its calculation process is legible and need not iterative circulation. In addition, a stability probability of surrounding rock for a tunnel was calculated by the improved method, whose workload is only 30% of classical method and its accuracy is comparative.
基金Project supported by the National Natural Science Foundation of China （Grant No. 20904047）, the Science and Technology Planning Project of Zhejiang Province, China （Grant No. 20100022）, and the Natural Science Foundation of Zhejiang Province, China （Grant No. Y6110304）.
文摘We study the translocation of a protein-like chain through a finite cylindrical channel using the pruned-enriched Rosenbluth method （PERM） and the modified orientation-dependent monomer-monomer interaction （ODI） model. Attractive channels （εcp = -2.0, -1.0, -0.5）, repulsive chanaels （εcp： 0.5, 1.0, 2.0）, and a neutral channel （εcp =- 0） are discussed. The results of the chain dimension and the energy show that Z0 ： 1.0 is an important case to distinguish the types of the channels. For the strong attractive channel, more contacts form during the process of translocation. It is also found that an external force is needed to drive the chain outside of the channel with the strong attraction. While for the neutral, the repulsive, and the weak attractive channels, the translocation is spontaneous.
