Keywords: geometric nonlinearity, sag effect, equivalent modulus of elasticity, vehicle - bridge interaction.关键词: 几何非线性 、 中垂效应 、 等效弹性系数 、 车桥互制.The eigenfrequency of oscillation cavity is the function of cavity's geo...
Geometric designs were popular wall decorations in the 14th century.14世纪，几何图形是风靡一时的墙壁装饰图案。Many pictures have been based on simple geometric designs.许多画都是基于简单的几何图案。These results parallel Archimedes'geometric theorems...