下三角 meaning in English
lower triplet
Examples
- The algebraic properties of a type of infinite lower triangular matrices related to derivatives
一类无穷下三角矩阵的代数性质 - Our study showed the following : mastoid process , transverse process of the atlas , and occipital condyle were important signs , superior and inferior suboccipital triangle is the important mark for distinguishing vertebral artery
研究显示：乳突、环椎横突和枕髁是术中重要的解剖学标志，上、下枕下三角是暴露椎动脉入颅前的一个重要解剖学标志。 - Instead of adopting exterior matrix p ( s ) diagonal 1 or s , triangle 0 or as which the predecessors used , i employ the exterior matrix p ( s ) diagonal 1 or the structure of iir filter ( for convenience , s + i s employed ) , triangle 0 or the structure of iir filter ( for convenience , a ( s + p ) is employed ) . this method eliminate the element 1 / s in close transfer matrix whereas the predecessors ' s method carried
但该方法采用的p ( s )主对角元素为1或s ，下三角元素为0或s 。这样，闭环传递函数就必定出现因子1 s ，不利于系统的稳定性与鲁棒性。针对这个问题，本文提出一种改进的方法，可使外矩阵p ( s )的主对角上元素为1或iir滤波器的结构形式(为简单起见，取s + ) ，下三角元素为iir滤波器的结构形式(为简单起见，取( s + ) )或0 。 - Whether they are stable or not has an important influence on off shore construction and the safty of the buildings . based on the tests of silt in marine area of chengdao , silt ' s dynamic stress - strain relationship , dynamic strength and their influencial . factors are initial researched . liquefaction of silt , including mechanism , speciality and pattern , is also discussed
随着海洋油气开发的迅速发展，发现海上构筑物的失稳与工程地基特性有着密切关系，而国内外几大油气开采区地基土中均有大量粉土分布，本文的研究区? ?黄河水下三角州埕岛海域也是如此。 - In ship steering controller design , the nonlinear ship model should be written in siso strict feedback form . we start the recursive design with the system first state variable and continue with the second one . by introducing a change of coordinates , we choose lyapunov functions to stabilize the system and obtain the control law
在船舶航向控制方面，考虑船舶的稳态回转非线性，应用backstepping方法设计：首先把系统化成单入单出的严格反馈控制形式(呈下三角结构) ，假设系统后一个状态变量是前一个状态变量的虚拟控制，通过适当的变量代换，在每一步构造李亚普诺夫函数，使前一子系统在虚拟控制下渐近稳定，逐步递推出控制器控制规律，使整个系统在平衡点满足一致渐近稳定性。