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双曲空间的三种空间模型及其等距转化关系 被引量:2
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作者 梁林 《云南师范大学学报(自然科学版)》 2001年第6期1-8,共8页
文章主要研究了双曲空间的三种模型及其等距转化关系 ,并对它们的测地线。
关键词 双曲空间 互化关系 空间模型 等距转关系 度量形式 测地线 截曲率 黎曼几何
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浅谈“1”与三角函数
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作者 钟效锋 《四川理工学院学报(社会科学版)》 1999年第2期71-74,共4页
三角函数恒等变换是学好三角和其它数学知识的重要基础,其解题思路广、方法多,而作为数字起源的“1”有着丰富的内涵,在三角函数中更有着特殊的作用。本文就“1”的作用谈谈粗浅的体会。
关键词 三角函 恒等变换 三角变换 数学知识 三角和 三角恒等变形 数字起源 互化关系 地位和作用 等比性质
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板书设计的十种方式
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作者 陈世安 《小学教学研究》 1999年第11期23-23,共1页
1.回环式。根据知识间的内在联系,用板书反映出其纵横、正逆关系。如:分数、小数、百分数之间的互化关系。分数(?)
关键词 互化关系 板书设计 最小公倍数 关系 内在联系 百分数 知识 方式 小数点 环式
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Correlation Between Chemical Element Contents in Tree Rings and Soils 被引量:8
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作者 QIANJUN-LONG KESHAN-ZHE 《Pedosphere》 SCIE CAS CSCD 1993年第4期309-319,共11页
The annual growth rings of ten trees and the soils near the tree roots were sampled from the mining area of lead-and zinc-dominant metals in the Xixia Mountain, Nanjing, for the determination of chemical element conte... The annual growth rings of ten trees and the soils near the tree roots were sampled from the mining area of lead-and zinc-dominant metals in the Xixia Mountain, Nanjing, for the determination of chemical element contents. The study results showed that the elemental contents in the tree rings were correlated with those in the soils, i. e., the elemental contents in the tree rings increased with those in the soils, even in the cases of different environments and different tree species. Therefore, a time-concentration sequence could be set up on the basis of determining the elemental contents in the successive annual growth rings of trees to qualitatively reflect the annual variations of relevant elements in the soils, and a time-concentration sequence of elemental contents in soils could also be established in terms of related model to reproduce the dynamic changes of the surroundings. 展开更多
关键词 CORRELATION elemental contents SOILS tree rings
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The Development of Hip-Hop Dance Culture in China
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作者 CHEN Min 《Sino-US English Teaching》 2014年第5期387-392,共6页
Hip-hop dance originated in the Black neighborhood of New York popular global youth cultures in an unprecedented fashion. As in the 1970s and developed as one of the most a global youth culture, it was introduced to C... Hip-hop dance originated in the Black neighborhood of New York popular global youth cultures in an unprecedented fashion. As in the 1970s and developed as one of the most a global youth culture, it was introduced to China's Mainland 30 years ago, underwent a series of rises and falls, and gradually transformed into a local scene under the influence of neighboring countries and regions. As hip-hop dance localizes in China, it has incorporated local ingredients such as Chinese traditional culture. Meanwhile, its function such as bodybuilding is also strengthened but the features such as competitiveness are weakened. The localization of hip-hop dance in China's Mainland reflects the globalization of the youth culture, which is featured by local hybridity, multicultural interactions, and conflicting interdependence with public media and commerce. This trend endows the global youth culture with a richer and more complex style and also shows that youth play an active part in generating the new forms and new styles of youth culture. 展开更多
关键词 hip-hop dance youth culture LOCALIZATION GLOBALIZATION China
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