电击伤的家庭急救

1、电击伤包括触电和雷击。触电常发生于架线工人,起重机、重型设备操作人员和家庭内电器使用不慎者。

Research on BP-ANN Model of Semi-rigid Connection

The beam-to-column semirigid connection in a steel frame structure is represented by a zero-length rotational spring at the end of the beam element. The beam-to-column semirigid connection behavior is represented by its moment-rotation relationship. Several traditional mathematical models have been proposed to fit the moment-rotation curves from the experimental database,but they may be more reliable within certain ranges. In this paper, the intellectualized analytical model is proposed in the semirigid connections for top and seat angles with double web angles using the feed-forward back-propagation artificial neural network （BP-ANN） technique. the intellectualized analytical model from experimental results based on BP-ANN is more reliable and it is a better choice to the moment-rotation curves for beam-to-column semirigid connection. The results are found to provide effectiveness to the experimental response that is satisfactory for use in steel structural engineering design.

艺苑

一声声粗犷雄浑的劳动号子,如沉实有力的鼓锤,将我们的心擂得咚咚作响。分明看见,一群裸胸赤臂顶天立地的汉子,头顶烈日,以纤夫的造型,背负着沉重的历史自远古迤逦而来,浑圆的汗珠从他们黝黑的脸上滚落,沉重的步履叩击着苍凉,深深的脚窝印满了艰辛。劳动号子,是从蓄满岩浆的胸腔里喷出来的,是从青筋暴突的手臂上抡出来的,是用全部的激情吼出来的。在这雄浑的号子声里。