in fact the most suitable method for finding the load bearing capacity of a member under the axial load or axial load and bending is make use of the interaction diagrams. to analysis and design the hollow circular, square and rectangular high strength concrete (hsc) column shapes, a linear strain variation was assumed in the cross-section height of the members and then the static equilibrium eq...

Recently, a worldsheet dual to free ${\cal N}=4$ Super Yang-Mills has been proposed in terms of twistor variables for ${\rm AdS}_5$, parallel that the AdS}_3$ symmetric orbifold CFT. In latter case, holomorphic covering maps play central role determining correlators and are associated Feynman diagrams. After recasting these AdS}_3$, we generalise AdS}_5$. We propose stringy incidence relations ...