An incompatible displacement element and a hybrid stress element are developed to model the effective mechanical properties of three-dimensional(3-D) textile composites.

Methods Use the method of unit-coordination to study the spatial and structural charac- teristics and development trends of the city-town system in the condition of the broken terrain and propose the idea of taking"the loess tablelands"as the coordinating units of the city-town system.

With the inspiration of fractal structure in protein, the internal structure of fractal agents, the function of fractal information components and coordination units, and the nesting mode of fractal supply chain in (manufacturing) industry are presented.

Based on the vertical deformation model[l] and the radial deformation model[2], the control differential equations of pile and pile-surrounding soil are established by the elastic theory and the pile-soil displacement coordination condition.

In this paper, based on the vertical deformation model[1] and the radial deformation model[2], the control differential equations of pile and pile-surrounding soil are established by the elastic theory and the pile-soil displacement coordination condition.

Aiming at this issue,the article deduces the relative single pile theoretical calculation formula by introducing the basic assumption of the pile shaft resistance to be linearly distributed at each pile section of pile shaft and based on the condition of pile and soil interface displacement coordination,which provides the theoretical reference for the construction of pile foundation.