The basic head shape of high-speed train is determined by its longitudinal type-line(LTL),so it is crucial to optimize its aerodynamic performance.Based on the parametric modeling of LTL constructed by non-uniform rel...The basic head shape of high-speed train is determined by its longitudinal type-line(LTL),so it is crucial to optimize its aerodynamic performance.Based on the parametric modeling of LTL constructed by non-uniform relational B-spline(NURBS)and the fluctuation pressure obtained by large eddy simulation(LES),the Kriging surrogate model(KSM)of LTL was constructed for low aerodynamic noise,and the accuracy of the KSM was improved gradually by adding the sample point with maximum expected improvement(EI)and the optimal point from optimization.The optimal objective was searched with genetic algorithm(GA).The results show that the total fluctuation pressure level(FPL)of the optimal LTL can be 8.7 dB less than that of original one,and the shape optimization method is feasible for low aerodynamic noise design.展开更多
The fragile rice mutant was isolated from an M2 population of indica variety Shuang Ke Zao (SKZ) treated with γ-rays, and designated as fp1 {fragile plant 1) because of its fragile leaves and culms. To map FP1 locus,...The fragile rice mutant was isolated from an M2 population of indica variety Shuang Ke Zao (SKZ) treated with γ-rays, and designated as fp1 {fragile plant 1) because of its fragile leaves and culms. To map FP1 locus, an F2 mapping population was derived from a cross between the fp1 and C-bao, a polymorphic japonic variety. The primary mapping result places the FP1 locus in an interval between two molecular markers, microsatellite marker RM16 (3.1 cM proximal to FP1) and STS marker G144a (9.1 cM distal to FP1) in the centromere region of chromosome 3. A CAPS marker C524a was further developed between RM16 and G144a, with 0.4 cM genetic distances to the FP1 locus, providing a practical starting point for constructing a BAC con-tig spanning the FP1 locus and cloning the fp1 gene. Allelism test demonstrated that fpl is allelic to be 1, a fragile rice mutant reported previously.展开更多
基金Projects(50975289,51275531)supported by the National Natural Science Foundation of ChinaProject(201104514)supported by the Special China Postdoctoral Science Foundation,ChinaProject(20100471229)supported by China Postdoctoral Science Foundation
文摘The basic head shape of high-speed train is determined by its longitudinal type-line(LTL),so it is crucial to optimize its aerodynamic performance.Based on the parametric modeling of LTL constructed by non-uniform relational B-spline(NURBS)and the fluctuation pressure obtained by large eddy simulation(LES),the Kriging surrogate model(KSM)of LTL was constructed for low aerodynamic noise,and the accuracy of the KSM was improved gradually by adding the sample point with maximum expected improvement(EI)and the optimal point from optimization.The optimal objective was searched with genetic algorithm(GA).The results show that the total fluctuation pressure level(FPL)of the optimal LTL can be 8.7 dB less than that of original one,and the shape optimization method is feasible for low aerodynamic noise design.
基金This work was supported by the State Key Basic Research Program (Grant No. 19990116) the National Natural Science Foundation of China (Grant Nos. 39970409 and 39970871) the Natural Science Foundation of Zhejiang Province (Grant Nos. 300220 and 300221
文摘The fragile rice mutant was isolated from an M2 population of indica variety Shuang Ke Zao (SKZ) treated with γ-rays, and designated as fp1 {fragile plant 1) because of its fragile leaves and culms. To map FP1 locus, an F2 mapping population was derived from a cross between the fp1 and C-bao, a polymorphic japonic variety. The primary mapping result places the FP1 locus in an interval between two molecular markers, microsatellite marker RM16 (3.1 cM proximal to FP1) and STS marker G144a (9.1 cM distal to FP1) in the centromere region of chromosome 3. A CAPS marker C524a was further developed between RM16 and G144a, with 0.4 cM genetic distances to the FP1 locus, providing a practical starting point for constructing a BAC con-tig spanning the FP1 locus and cloning the fp1 gene. Allelism test demonstrated that fpl is allelic to be 1, a fragile rice mutant reported previously.
