Bayes discriminant analysis method to identify risky of complicated goaf in mines and its application

A Bayes discriminant analysis method to identify the risky of complicated goaf in mines was presented. Nine factors influencing the stability of goaf risky, including uniaxial compressive strength of rock, elastic modulus of rock, rock quality designation （RQD）, area ratio of pillar, ratio of width to height of pillar, depth of ore body, volume of goaf, dip of ore body and area of goal, were selected as discriminant indexes in the stability analysis of goal. The actual data of 40 goals were used as training samples to establish a discriminant analysis model to identify the stability of goaf. The results show that this discriminant analysis model has high precision and misdiscriminant ratio is 0.025 in re-substitution process. The instability identification of a metal mine was distinguished by using this model and the identification result is identical with that of practical situation.

关注言语形式 习得语用方法

小学语文教学抓住言语这一核心内容,促进儿童习得语用方法,教学期间引导学生感知言语,从形式方面体会文章中对言语使用的技巧。本文围绕统编版小学六年级语文上册第四单元的阅读教学,探究教学活动中关注言语形式的有效教学策略,涉及的内容有对言语形式的处理、比喻和拟人手法、匠心独运的篇章结构、精妙传神的文本材料以及不同文章的对比辨析手段,确保学生在语文课堂教学环节能经历较为完整的思维历程,在理解和有深刻感受的前提下,习得言语形式的语用方法。