The basic physical and mechanics properties of fly-ash,such as liquid-plastics limits,compaction,compressibility,permeablity properities,lateral pressure coefficient at rest were discussed.The results show that fly-ash is of low specific gravity,low compressibility,high strength and high permeability etc.Its compacted dry density is nonsensitive to moisture content.

To study the ecological effect of electro-magnetic field of HV AC transmission line,with analyzing the characteristics of its power frequency electro-magnetic field,the ecological effect and the improvement measures,model was built to calculate human induced current,human internal electric field intensity,human ion displacement amplitude.Results showed that when power frequency electric field intensity from HV AC transmission line was 4 kV/m,total induced current passing through human body is 60μA,human body internal electric field intensity is 0.176×10~(-3)V/m,and human body ion transferring amplitude is 8.01×10~(-12) m.

According to the teaching experience,the article summarized the solving method of problems and the attention problems in the so-lution process,which can help students to get clear their thread and use smartly knowledge,and apply preferably the knowledge learned in solving practical project problems.

By analyzing the structural cracks led by the mechanism of temperature change of bulk concrete, the paper discusses about aspects such as the temperature monitoring, construction measures and the requirement for the raw materials and elaborates the specific technology to prevent cracks and the project management measures in bulk concrete construction.

The characteristics of systematic analysis based on reliability index were generalized according to reliability theory at first.The dielectric age model with prior information as element was built based on analysis flow process chart with prior information as guidance.At the same time of calculation comparison with other analysis methods,the new model characteristics were analyzed,the resolving accident density parameter numerical calculation method in information space was given.

分析论证了桩土接触面相互作用的影响半径理论;划分了桩土体系的三个组成部分并基于能量原理论证了桩土体系力学场量的特征和运动趋向;探索了接触问题中桩土的互动与响应。

力学中的不同理论对材料的破坏进行了解释,并构建了自己的理论框架。材料的破坏是跨学科、多尺度的难题,它是材料自身特性,外荷载及环境三方面综合作用的结果。力图拓宽研究思路,体现力学新思维。

A famous problem of finite groups is that:Hall subgroups of M-groups are M-groups?A sufficient condition tor Hall subgroups of M-groups being M-groups is given in the paper:Suppose that G is M-group with Hall subgroup H and p(?)(1)if every chatacter (?)∈Irr(H),then H is M-group.