Modeling of Normal Perforation of Reinforced Concrete Slabs by a Rigid Projectile

An analytical model on the normal perforation of reinforced concrete slabs is constructed. The effect of reinforcing bars is further hybridized in a general three-stage model consisting of initial cratering, tunnelling and shear plugging. Besides three dimensionless numbers, i. e. , the impact function /, the geometry function of projectile N and the dimensionless thickness of concrete target X, which are employed to predict the ballistic performance of perforation of concrete slabs, the reinforcement ratioρs of concrete and the tensile strength fs of reinforcing bars are considered as the other main factors influencing the perforation process. Simpler solutions of ballistic performances of normal perforation of reinforced concrete slabs are formulated. Theoretical predictions agree well with individual published experimental data.     

浅谈高职高专英语视听说课程替代英语基础课程的可能性

随着中国经济的发展,和外国的合作越来越多,这就加大了对英语人才的需求。但是基础英语教学过于注重知识(尤其是语法知识)的传授,轻视语言能力的培养。导致了经过十多年的学习后,中国学生还是听不懂、说不出英语,不能适应我国经济建设和社会发展的需要。因此,英语必须调整课程与教学计划,以培养学生的交际能力为目的。这不仅得到了理论支持,甚至各方面的条件的成熟都将支持这一变革。     

从《庄子》的神话思维看庄子的循环变化思想

庄子是中国古代思想家中最善运用神话的人。《庄子》一书气势磅礴,汪洋恣肆,将其独特的道家思想蕴于神话之中,通过运用神话阐释他心中的循环变化思想。从鲲与鹏,庄周与蝶,种有几,混沌之死,瓠与瓢等5个神话可以看出庄子独特的内心世界。庄子以其特有的神话思维方式,气象万千的想象力,影响着中国文化。     

Gender Adeptness Among Educational Administrators for Leading Innovative Initiatives in Public Education

It may be concluded that female administrators are perceived as being more adept than their male counterparts for leading innovation in schools and leveraging resources into productive outputs. It may be concluded that both genders of administrators perceive such efforts similarly. The only two skills where gender is significant are the two eornpetencies identified as being alert for new opportunities and synthesizing ideas into focused projects. For the other eight skills indicated in the survey, gender did not play a significant role in such perceptions.     

存在主义哲学中的“时间”

存在主义是在二十世纪的二十年代初显端倪的哲学流派。它认定本真的“个体”为其哲学的衍生根柢 ,在时间的三维 (过去、现在、将来 )整体性向度上 ,对“个体”的“可能性”情状予以重视 ,彰显出死亡逼近时的个体对于自身多舛的罹难体验 ,并以此说明了“存在”的意义。本文就“个体”的存在与有限 ,剖析了这一卓尔不群的人生哲学中的时间整一性问题     

Hilbert‘s Sixteenth Problem and Its Generalization

This paper deals with Hilbert‘s 16th problem and its generalizations.The configurations of all closed branches of an algebraic curve of degreee n are discussed.The maximum number of sheets for an algebraic equation of degree n and the maximum number of limit cycles for a planar algebraic autonomous system are achieved.The author also considers different generalizations and some related problems.     

不定积分求解方法研究

给出了不定积分的两种求解新方法，结合实例讨论了这些方法在不定积分求解中的可行性，对快速正确求解不定积分有一定意义。     

试论合同法中的情事变更原则

情事变更原则是在民商事活动中以诚实信用原则为基础逐渐演绎出来的，其在适用条件、法律效力方面不同于不可抗力、显失公平和商业风险，虽然没有被写进我国的新《合同法》，但它已逐渐被其他许多国家的民商事立法所确认，成为一项较为基本的民商事活动原则。     

Banach空问中一阶脉冲积分-微分方程初值问题的解

在Banach空间中讨论了混合型一阶脉冲积分-微分方程初值问题{x′=f（t,x,Tx,Sx）,A↓t∈J,t≠tk；△x｜t=tk=Ik（x（tk）,k=1,2,…,m,；x（0=x0的解，并给出了解的迭代求法．