Series of screen - bohou adopt large amplitudes , big intensity of vibrations , flexible screen surfaces , the motion parameters characteristics of adjustable amplitudes ; the unique structural features of " board of screen active , box inactive , unattached vibration of the screen surface " ; though segmented , multi - segments of screen surface jointed , large - scale of screen equipments can be realized , the advantages of large area , big handling capacity and no special requirements to the water of materials make the screen to be the best screen equipments used for the small wet materials 简介：博后筛系列采用大振幅、大振动强度、弹性筛面、振幅可调的运动参数特点；及独特的“筛板振动、筛箱不振动、各段筛面独立振动”的结构特点；经分段、多段筛面组合，实现了筛分设备大型化，大面积、大处理能力的优势及对物料水分的无特殊要求，是潮湿细粒难筛物料的最佳筛分设备。
On the assumption that the framed tower can be represented by multi - segment cantilever carrying a spring support , a mathematical expression to determine the natural frequencies of a framed tower is obtained by using the equation of the transverse vibration for the analytical model of elastic continuous body and the method of numerical solution 摘要框架和塔连接后可简化为一个弹性支承的系统，利用弹性连续体分析法求解振动方程，推导出了计算框架塔自振频率的理论公式。
By means of comparing with general and traditional enterprise systems the text summarizes three main characteristics or the creativity of the sharing system of the shanxi merchants firstly . those are as follow : the average division in the form of organizing capital and allocating revenues , multi - segment of property rights of enterprise , the administrative multi - level of the structure of the organization 通过与一般传统企业制度相比较，本文首先总结出晋商股份制的三个主要特点或创新之处，即：资本组织和收益分配形式上的股份化，企业产权的多层次、多重分割，组织结构的层级化。
So the integrality of the analytical resolution was preserved in term of the single parameter and the multi - parameters when the pipelines - soil system ' s parameters change with the space and time under dynamical loads . continuous multi - segment beam model is the other method of the common used model on the study of the pipelines . during the sixth chapter , such simplified model was adapted for the pipelines under dynamical traffic loads 文中还将受交通荷载作用下的管道简化为多跨连续梁受力模型进行研究，应用结构力学方法分析了简谐交通荷载下管道受力响应的特征；并考虑参数变化的随机性，采用了摄动理论对管-土参变系统进行了其响应的概率特征描述，提出了简便的分析方法。
