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关于曲线构图的一点探讨
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作者 焦莉萍 《科教导刊》 2014年第10S期75-76,共2页
本文通过例题引出在曲线构图时需要注意的问题并加以总结,随之用典型题目予以强调应用,以期提高学生利用导数知识解决问题的能力。
关键词 导数应用 曲线构图 能力提高
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Concealed fault analysis based on the CT projection matrix 被引量:2
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作者 Yang Zhen Yao Wenli +1 位作者 Ma Liuzhu Wise Lucas 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第2期361-367,共7页
This paper proposes the concept of projection curves based on the theory of CT image reconstruction to probe the internal structure of the working panel prior to formal mining of the working panel.As well as reducing ... This paper proposes the concept of projection curves based on the theory of CT image reconstruction to probe the internal structure of the working panel prior to formal mining of the working panel.As well as reducing costs,this method provides safe and efficient excavation of the working panel.According to the results of the numerical model and the actual working panel,the new method has been proven to be accurate in detecting the location of the fault that extends into the face.Concealed faults of the internal working panel,as well as the start and end points of the fault,can be detected by this method.Engineering practice has proven that the method is highly reliable,has a highly decisive impact on faults for coal mining,and can be used to guide the safe mining of the working panel. 展开更多
关键词 Working panel Computed tomography Concealed fault Project curve
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Full automorphism group of the generalized symplectic graph 被引量:4
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作者 ZENG LiWei CHAI Zhao +1 位作者 FENG RongQuan MA ChangLi 《Science China Mathematics》 SCIE 2013年第7期1509-1520,共12页
Let Fq be a finite field of odd characteristic, m, v the integers with 1 ≤ m ≤ v and K a 2v × 2v nonsingular alternate matrix over Fq. In this paper, the generalized symplectic graph GSp2v(q, m) relative to K... Let Fq be a finite field of odd characteristic, m, v the integers with 1 ≤ m ≤ v and K a 2v × 2v nonsingular alternate matrix over Fq. In this paper, the generalized symplectic graph GSp2v(q, m) relative to K over Fq is introduced. It is the graph with m-dimensional totally isotropic subspaces of the 2v-dimensional symplectic space Fq(2v) as its vertices and two vertices P and Q are adjacent if and only if the rank of PKQw is 1 and the dimension of P ∩ Q is m - 1. It is proved that the full automorphism group of the graph GSp2v(q, m) is the projective semilinear symplectic group P∑p(2v, q). 展开更多
关键词 generalized symplectic graph AUTOMORPHISM projective generalized symplectic group totally isotropic subspace generalized dual polar graph
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A fake projective plane constructed from an elliptic surface with multiplicities (2,4) 被引量:1
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作者 KEUM JongHae 《Science China Mathematics》 SCIE 2011年第8期1665-1678,共14页
Given any (2,4)-elliptic surface with nine smooth rational curves,eight (2)-curves and one (3)-curve,forming a Dynkin diagram of type [2,2][2,2][2,2][2,2,3],we show that a fake projective plane can be constructed from... Given any (2,4)-elliptic surface with nine smooth rational curves,eight (2)-curves and one (3)-curve,forming a Dynkin diagram of type [2,2][2,2][2,2][2,2,3],we show that a fake projective plane can be constructed from it by taking a degree 3 cover and then a degree 7 cover.We also determine the types of singular fibres of such a (2,4)-elliptic surface. 展开更多
关键词 fake projective plane properly elliptic surface cyclic covering
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