1) tetrahedron permeable frame
透水框架四面体
1.
Experimental study on flood control and bank protection by tetrahedron permeable frames;
透水框架四面体防洪护岸试验研究
2) tetrahedron frame
四面体透水框架
1.
Experimental study on effect of local scour at piers and protection by tetrahedron frame;
桥墩附近四面体透水框架抛投防冲效果试验研究
3) penetrating frame-tetrahedron
透水框架式四面体
1.
On the basis of Flow Intelligent Model (FIM) conception from Gu Zheng-hua and Tang Hong-wu, penetrating frame-tetrahedrons wake field was simulated through artificial neural networks method, and a new idea was provided on flow fields simulation.
基于作者提出的水流智能模型思想,运用人工神经网络方法对透水框架式四面体的尾流场进行智能模拟,为复杂水流的空间流场仿真提供一种新的研究途径。
4) tetrahedron frame group
四面体透水框架群
1.
The engineering protection measures of tetrahedron frame group for scour prevention and bank base eroding protection applied to practical projects and laboratory tests in recent years were systematically summarized,and the protectionmechanism and effect of tetrahedron frame group as well as their advantages and disadvantages were discussed and appraised.
系统地总结了近年来应用于实际工程和室内实验研究的四面体透水框架群防冲固脚技术的研究现状,对这种防冲固脚技术的防护机理、防护效果和防护的优缺点进行了论述和评价,并介绍了四面体透水框架群防护的工程实例,以及该防护工程技术在后续研究和工程应用的主要方向。
5) permeable frame of tetrahedron with six sides
四面六边透水框架体
6) tetrahedron-like penetrating frame group
四面六边透水框架群
1.
Based on the existing levees,utilizing tetrahedron-like penetrating frame group which is a new technology of river regulation,a stable canalized channel is trimmed between two levees,and a compound cross-section with narrow canal and wide beach is formed.
即依托现有的大堤,利用混凝土四面六边透水框架群这一新型河道整治工程技术,在两大堤之间整治出一条稳定的渠化河槽,形成窄槽宽滩复式断面。
补充资料：四面体数
四面体数或三角锥体数是可以排成底为三角形的锥体（即四面体）的数。四面体数每层为三角形数，其公式是首n个三角形数之和，即n(n + 1)(n + 2) / 6。其首几项为：1, 4, 10, 20, 35, 56, 84, 120...（oeis:a000292）
四面体数的奇偶排列是“奇偶偶偶”。
1878年，a.j. meyl证明只有3个四面体数同时为平方数：1, 4, 19600。唯一同时是四面体数和正方锥数的数是1（beukers (1988)）。
它们可以在杨辉三角每横行从右到左或左到右的第4项找到。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。