我要出门一个月

“我要出门一个月”,当我把这个消息向全班公布时,50多个学生50多种表情。望着刚刚熟悉的张张面孔,我继续说:“而且,我不打算找代理班主任。”大家更是表情各异!这个班,由于各种原因,入学不到一年,已换了三届班主任,我是第四位,刚刚接手,这个时候公布这个消息,对于这个“乱班”     

Base Stress of the Opened Bottom Cylinder Structures

The base stress of the opened bottom cylinder structure differs greatly from that of the structure with a closed bottom. By investigating the inner soil pressure on the cylinder wall and the base stress of the cylinder base, which were obtained from the model experiments, the interactions among the filler inside the cylinder, subsoil and cylinder are analyzed. The adjusting mechanism of frictional resistance between the inner filler and the wall of the cylinder during the overturning of the cylinder is discussed. Based on the experimental study, a method for calculating the base stress of the opened bottom cylinder structure is proposed. Meanwhile, the formulas for calculating the effective anti-overturning ratio of the opened bottom cylinder are derived.     

炉盖上的胶带

阳历12月中旬的北方,已进入了严冬季节。树上的枯叶早已落尽,枝条上也再没有了一丝的绿意。呼呼的北风肆虐地刮着,灰黄的天空中,     

Investigation on Instable Standard of Embedded Cylindrical Structure

THE CONTROL VALUE OF THE DEFLECTION OF THE EMBEDDED CYLINDRICAL STRUCTURE, WHICH IS THE MAXIMUM DEFLECTION ALLOWED FOR STABILITY OF THE CYLINDER, IS A VITAL QUANTITY OF STABILITY CALCULATION. THE DEFLECTION AND THE SOIL PRESSURE ON THE EMBEDDED CYLINDER WERE INVESTIGATED BY MODEL EXPERIMENT. WHEN THE INCLINED ANGLE OF CYLINDER IS LESS THAN OR EQUAL TO 0. 25°, THE EFFECTIVE ANTI-OVERTURNING RATIO INCREASES GRADUALLY AND REACHES THE MAXIMUM. WHEN THE INCLINED ANGLE OF CYLINDER IS MORE THAN 0.25°, THE EFFECTIVE ANTI-OVERTURNING RATIO DECREASES GRADUALLY. THE CONTROL VALUE OF INSTABILITY OF THE CYLINDRICAL STRUCTURE APPROXIMATES 0. 2°, AND THE BEARING STRESS AT THE BACK EDGE OF THE CYLINDER IS EQUAL TO ZERO.