pappus

1. After dispersal, the short pappus of the achenes can adhere to the wet soil surface so that the achenes remain near the dead mother plant and germinate there.
   传播之后，瘦果的小冠毛能够附着在湿润的土壤表面，因此瘦果可以保留在死亡的母株附近并且在那里萌发。
2. Coarse herbs with whitish discoid flower heads and silky pappus.
   一个粗糙的草本属，白色盘状的头状花序，具绢毛状的冠毛。
3. A Study on Pappus's Mathematical Collection and Its Problems in China
   帕普斯的《数学汇编》及其问题在中国
4. This paper proves that Pappus proposition by means of analytical solution at real projective coordinate system and the issue about six point collineation are derived according to perspective feature of projective correspondence. Finally, the result of this thesis can be further generalized.
   借助射影坐标系用解析方法证明了巴卜斯命题，并由巴卜斯命题按照射影对应的透视特征导出了六点共线问题，最后把这个结果作了进一步的推广。
5. The Application and Extension of Pappus Theorem
   巴卜斯（Pappus）定理的应用与推广
6. Give a method to prove Desargues Theorem with Pappus Theorem on n-dimensional projective space P~ n.
   在n维射影空间Pn中，给出了用帕普斯定理来证明德萨格定理的另一个方法。
7. The Relation of Pappus Theorem to Desargues Theorem
   Pappus定理与Desargues定理之间的关系
8. On the Algebraic Character of Pappus Proposition
   关于Pappus命题的代数特性
9. About Perspective in the Pappus Theorem and Pascal Theorem
   关于Pappus定理和Pascal定理的透视问题
10. The well-known Pappus theorem and Desargues thorem in the Euclidean plane are extended to the Spherical space, and its applications ate also given out.
    1988年左铨如将欧氏平面的Menelaus定理推广到二维球面型空间.本文在此基础上直接证明了二维球面型空间的Desargues定理和Pappus定理，并给出它们的几个应用。
11. In this paper, Pappus theorem has been generalized in P~ 3 based on the duality principle of projective space.
    根据射影几何中的对偶原则，将P2中的Pappus定理及其对偶定理推广至P3。
12. Germination percentage of seeds with pappus was not evidently decreased after storage for 20 d.
    室温贮藏带冠毛的胡杨种子，前20d萌发率降低幅度不大。
13. After 40 days, germination percentage of the seeds with pappus still remained 23.3% under room temperature.
    室温贮藏40d的带冠毛胡杨种子仍有22.3%的萌发率。
14. Pascal theorem turns into Pappus theorem when the curve of second order is degenerated into two straight lines.
    在Pascal定理中，若二阶曲线退化为两条直线时，Pascal定理就变为Pappus定理。

noun

1. calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions