For the luggage conveyer system runs smoothly and steadily , we synthetically analyzed the characteristic of the belt machine ' s running , starting and applying the brake . we decide to use the current transducer 6se92 of siemens with high function u if control . this transducer ' s functions of adding or decreasing speed with s form and torque promoting can magnificently solve the belt machine ' s vibration in the time of starting and brake and make the belt machine smoothly working with vary goods 为了实现行李输送系统平滑稳定的运行，我们综合分析了皮带机运行特性，及起、制动时的特性，决定采用具有高功能型u f控制的通用变频器6se92 (西门子) ，此变频器的s形加减速功能和转矩提升功能，能很好的解决皮带机起制动时的振动及不同带载量时的稳速运行。
Main conclusions or / and creative work are given in following . all materials have same fcp pattern , i . e . , the whole fcp curve comprises the near - threshold region , the intermediate region of stable crack propagation and the rapid crack propagation region and with s shape , though the materials have different micro - mechanisms of fcp 本文的主要结论和创新点有：首先，认为所有固体材料均具有相同的疲劳裂纹扩展宏观规律，即完整的疲劳裂纹扩展曲线都由近门槛区、中部稳定扩展区和快速扩展区所构成，曲线具有相似的s形，尽管不同特性的材料具有不同的疲劳裂纹扩展的微观机制。
The results indicated : ( 1 ) during the jointing stage of winter wheat , the differences of catalase activity among different measures of soil water utilization are significant in shallow soil , in which the catalase activity of furrow planting with straw mulch is the highest and that of row - spacing - reduced and close planting is the lowest ; ( 2 ) the trends of catalase activity versus depth are almost the same for different treatments , looking like an inverse s ; ( 3 ) for furrow growing without mulch , the activity of soil catalase in the furrow is higher than that in the ridge ; ( 4 ) soil catalase activity reflects some effects from different techniques of soil water utilization and may be used as a indicator for micro - eco - environment in the fields 初步分析得出： ( 1 )冬小麦拔节期，采用不同土壤水利用技术的冬小麦田浅层土壤过氧化氢酶活性差异明显，以沟播不盖秸秆处理的过氧化氢酶活性最强，缩行密植处理的最弱； ( 2 )土壤过氧化氢酶活性随深度的变化趋势大体一致，呈反s形； ( 3 )沟播不盖秸秆处理沟中土壤过氧化氢酶活性明显高于垄上； ( 4 )土壤过氧化氢酶对于田间微生态环境具有指示作用，在一定程度上反映了土壤水利用技术对微生态环境的影响。
From the postulate of the stretch - forming , with the help of sheet - forming software , the computer simulation of the stretch - forming of a s - shape aircraft skin is proposed in this paper , including the build of fem mode , the preferences of simulation , the forming , the whole body spring back and the spring back after clipping . the spring back radius is calculated on the simulate results and contrasted with the reality 从拉形的基本原理出发，本文运用sheet - forming对s形飞机蒙皮进行拉形成形的计算机仿真，包括有限元模型的建立、仿真参数的选择、加载成形、整体卸载回弹、切边卸载回弹；运用仿真结果计算回弹半径求出回弹量，并将分析计算结果与实际生产的回弹量对比。
The vertical velocity in low troposphere is larger than high troposphere , and vertical velocity in flood year is also larger than that in drought year . the vertical velocity on different levels show that there exists distinct sinking motion from midlevel to uplevel of troposphere in drought years and updraft in whole atmosphere in flood years 垂直分布曲线均呈s形，垂直上升速度在对流层低层大于对流层上层，多雨年大于干旱年;不同层次上垂直速度分布图表明，旱年对流层中上层盛行下沉气流，而涝年整层大气始终表现为上升运动。
Second , the mode fields of a strip waveguide and some slab waveguides have been simulated by applying finite - difference time - domain ( fdtd ) method . the curvature radius ; vicinity coupling ; transition loss and power attenuation of a s - shape bend waveguide have been analysed numerically by employing wide angle finite - difference beam propagation method ( fd - bpm ) , as well as the coupling loss of optical fiber and waveguide . in addition , the framework of the s - shape waveguide laser has been 其次,应用时域有限差分法,结合波导模式理论对条形与平面波导进行了模场仿真;应用广角有限差分光束传播法,对s形弯曲波导的曲率半径、邻近耦合、过渡损耗、功率衰减以及波导与光纤的各种耦合损耗进行了数值分析,并在此基础上,对s形波导激光器的结构作了初步设计。
