The flow resistance of stent with different shapes of wire cross-section can be considered as a factor that influences the condition of inflow and outflow through the stent wire. Different from the traditional stents,...The flow resistance of stent with different shapes of wire cross-section can be considered as a factor that influences the condition of inflow and outflow through the stent wire. Different from the traditional stents, a novel stent with triangular wire cross-section was proposed, and numerical simulations were performed to compare the hemodynamic effect of the novel stent with that of traditional ones. Three constructed aneurysm models were treated with a different kin^l of stent separately, including one with bare circular wire cross-section stent （named CM）, one with bare rectangular wire cross-section stent （named RM）, one with bare triangular cross-section stent （named TM）. An unstented aneurysm model was also constructed to serve as a control （named UM）. Numerical simulations of the fluid-structure interaction in these four models were performed under the same boundary conditions using finite element method. The simulation results demonstrated the resistance of the novel stent is lower than RM stent, but higher than that of CM stent. TM stent attributes a higher velocity decreasing and a longer turnover time compared with CM stent. The distribution of wall shear stress indicated the possibility of aneurysm development along the distal wall was higher than the proximal wall, and the top of aneurysm was in the highest risk of rupture.展开更多
Based on optimization wharf structure type of triangle flame pier proposed, namely＂ Spatial triangular flame pier ＋ Big span bent which taking Slant supports＂ Simulating three-dimensional pier model of a variety of...Based on optimization wharf structure type of triangle flame pier proposed, namely＂ Spatial triangular flame pier ＋ Big span bent which taking Slant supports＂ Simulating three-dimensional pier model of a variety of conditions in the actual loading by structural finite element software. Under the guidance of the three-dimensional structure of the most unfavorable load combination algorithm, three-dimensional combination algorithm is applied to the new structure by the MATLAB software programming. Search and calculate the most unfavorable combination of action effects and the corresponding intemal force of the main member, checking the feasibility of the three-dimensional algorithms, Calculating the new wharf structure structural features and stability, Providing numerical reference for the design of this sort of wharf.展开更多
A metal-organic framework （MOF） has been obtained by using a linker extension strategy. Three di-anions of 4-（3,5-dimethyl- 1H-pyrazol-4-yl）-benzoic acid coordinate to three Cu（I） ions forming an extended trigon...A metal-organic framework （MOF） has been obtained by using a linker extension strategy. Three di-anions of 4-（3,5-dimethyl- 1H-pyrazol-4-yl）-benzoic acid coordinate to three Cu（I） ions forming an extended trigonal planar ligand, which links three di-copper paddlewheel units giving rise to a Pt304 net.展开更多
文摘The flow resistance of stent with different shapes of wire cross-section can be considered as a factor that influences the condition of inflow and outflow through the stent wire. Different from the traditional stents, a novel stent with triangular wire cross-section was proposed, and numerical simulations were performed to compare the hemodynamic effect of the novel stent with that of traditional ones. Three constructed aneurysm models were treated with a different kin^l of stent separately, including one with bare circular wire cross-section stent （named CM）, one with bare rectangular wire cross-section stent （named RM）, one with bare triangular cross-section stent （named TM）. An unstented aneurysm model was also constructed to serve as a control （named UM）. Numerical simulations of the fluid-structure interaction in these four models were performed under the same boundary conditions using finite element method. The simulation results demonstrated the resistance of the novel stent is lower than RM stent, but higher than that of CM stent. TM stent attributes a higher velocity decreasing and a longer turnover time compared with CM stent. The distribution of wall shear stress indicated the possibility of aneurysm development along the distal wall was higher than the proximal wall, and the top of aneurysm was in the highest risk of rupture.
文摘Based on optimization wharf structure type of triangle flame pier proposed, namely＂ Spatial triangular flame pier ＋ Big span bent which taking Slant supports＂ Simulating three-dimensional pier model of a variety of conditions in the actual loading by structural finite element software. Under the guidance of the three-dimensional structure of the most unfavorable load combination algorithm, three-dimensional combination algorithm is applied to the new structure by the MATLAB software programming. Search and calculate the most unfavorable combination of action effects and the corresponding intemal force of the main member, checking the feasibility of the three-dimensional algorithms, Calculating the new wharf structure structural features and stability, Providing numerical reference for the design of this sort of wharf.
基金supported by the U.S. Department of Energy (DOE Grants DE-FC36-07GO17033)the Welch Foundation (A-1725)+1 种基金supported by the National Science Foundation/Department of Energy under grant number NSF/CHE-0822838supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
文摘A metal-organic framework （MOF） has been obtained by using a linker extension strategy. Three di-anions of 4-（3,5-dimethyl- 1H-pyrazol-4-yl）-benzoic acid coordinate to three Cu（I） ions forming an extended trigonal planar ligand, which links three di-copper paddlewheel units giving rise to a Pt304 net.
