为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

为探索散栏式与栓系式饲养方式对肉牛增重性能的影响,选择体重相近(330 kg左右)、月龄相同(12月龄)、未去势、健康无病的50头西门......

For the study of the non-linear response of inclined tethers subjected to parametric excitation in submerged floating tu......

For the study of the parametric vibration response of submerged floating tunnel tether under random excitation, a nonlin......