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单折线坡面土坡最危险滑动面范围的几何分区研究
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作者 周宏 朱伟江 姜庆泉 《勘察科学技术》 2007年第2期21-23,27,共4页
该文在稳定性计算的基础上,得出单折线坡面土坡最危险滑面几何分区的包络线,包络线内任意点和坡顶、坡脚点构成的单折线坡面其最危险滑面将跨越坡顶点和坡脚点。对不同坡比的土坡进行包络线的拟合表明,包络线上下界主要部分呈直线,同时... 该文在稳定性计算的基础上,得出单折线坡面土坡最危险滑面几何分区的包络线,包络线内任意点和坡顶、坡脚点构成的单折线坡面其最危险滑面将跨越坡顶点和坡脚点。对不同坡比的土坡进行包络线的拟合表明,包络线上下界主要部分呈直线,同时不同坡比的拟合直线的斜率和截距与坡比有极好的线性相关关系。通过拟合方程快速确定包络线,可以很方便的对边坡最危险滑面位置以及滑坡体方量作粗略的估计,可以指导工程边坡的削坡处理。 展开更多
关键词 单折线坡面 分界线 滑动面 几何分区
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A Note on q-Deformed Two-Dimensional Yang-Mills and Open Topological Strings
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作者 张鹏 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第8期317-322,共6页
In this note we make a test of the open topological string version of the OSV conjecture in the toric Calabi-Yau manifold X = O(-3) → P^2 with background D4-branes wrapped on Lagrangian submanifolds. The Dbrahe par... In this note we make a test of the open topological string version of the OSV conjecture in the toric Calabi-Yau manifold X = O(-3) → P^2 with background D4-branes wrapped on Lagrangian submanifolds. The Dbrahe partition function reduces to an expectation value of some inserted operators of a q-deformed Yang Mills theory living on a chain of P^1 's in the base p2 of X. At large N this partition function can be written as a sum over squares of chiral blocks, which are related to the open topological string amplitudes in the local p2 geometry with branes at both the outer and inner edges of the toric diagram. This is in agreement with the conjecture. 展开更多
关键词 topological string theory 2d Yang-Mills theory OSV conjecture
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Electron Momentum Distributions for 4a1 Orbitals of CFxCl4-x in Low Momentum Region: a Possible Evidence of Molecular Geometry Distortion
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作者 Xu Shan Chun-kai Xu +3 位作者 Xiao-feng Yin Li-xia Zhou Ke-zun Xu Xiang-jun Chen 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第6期642-648,J0002,共8页
Electron momentum distributions for 4a1 orbitals of serial freon molecules CFaC1, CF2Cl2, and CFCl3 (CFxC14-x, x=1-3) have been reanalyzed due to the severe discrepancies between theory and experiment in low momentu... Electron momentum distributions for 4a1 orbitals of serial freon molecules CFaC1, CF2Cl2, and CFCl3 (CFxC14-x, x=1-3) have been reanalyzed due to the severe discrepancies between theory and experiment in low momentum region. The tentative calculations using equilibrium geometries of molecular ions have exhibited a great improvement in agreement with the experimental data, which suggests that the molecular geometry distortion may be responsible for the observed high intensities at p〈0.5 a.u.. Further analyses show that the severe discrepancies at low momentum region mainly arise from the influence of molecular geometry distortion on C-Cl bonding electron density distributions. 展开更多
关键词 (e 2e) Electron momentum spectroscopy Molecular geometry distortion Electron density distribution
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