查询词典 convex

The traditional convex hull algorithms of point set and that of simple polygons have parallelly developed without any combination.

传统点集凸包算法和简单多边形凸包算法平行发展，互不相干。

Stigma peltate, orbicular to cross-shaped, sometimes convex adaxially, 5--14 mm in diam.

柱头盾形，圆形对十字形，有时凸，--14毫米直径 36

Especially, it is found that there exists three types of relative permeability of water such as concave, convex to the water saturation ax and the reversed "S" pattern. The super-low permeability reservoir is sensitive to pressure, apparent with millipore undersaturation and water blocks. In this study, a new concept of irriducible undersaturation is brought up. And a new mode to describle the process of imbibition dynamics is used to reveal and confirm the mechanism of pinhole enveloping macropore as following: pendular ring of wetting phase gathers→it fills throat→it truncates nonwejting phase . The expression of pressure distribution and the equation of oil production are deduced under conditions of non-darcy linear seepage and non-linear seepage.

尤其发现水相相对渗透率曲线存在凹向、凸向含水饱和度轴及反S形三种形式；特低渗透储层的压力敏感性强，微孔隙的欠饱和及水锁效应显著，本文研究中提出欠束缚水饱和度的概念，引用一种描述渗吸动态即湿相液环聚集→充填喉道→截断非湿相的演化过程的新方法，更深刻地揭示和证明了&小孔包围大孔&机理；推导出了非达西线性渗流和非线性渗流条件下的压力分布表达式和油井产量方程。

Spikelets green, ovate to obovate, plumply plano-convex, 2.5–3.5 mm, smooth, shining, obtuse; upper glume cartilaginous, 3-veined, glabrous; lower lemma resembling upper glume but slightly shorter; upper lemma pale green, slightly shorter than spikelet, finely striate, obtuse.

绿色的小穗，卵形到倒卵形，平凸的plumply，2.5-3.5毫米，平滑，发亮，钝；上面颖片软骨质，3脉，无毛；除了稍短，象上面颖片的更低的外稃；上面外稃苍绿色，稍短于小穗，细条纹，钝。

These changes,coupled with soft tissue pogonion moving back and menton moving down,contributed the profile to become more convex.

硬组织的变化与软组织变化密切相关，但软组织自身的一些因素决定了改善的最终程度。

Polytope is introduced to describe different operating conditions as a convex set whose vertices are some selected typical operating parameters.

采用多胞型模型将系统运行状态的各种变化描述为以若干个典型运行参数为顶点的凸集。

By using Taylor series approximation and convex polytope technique, exponential uncertain discrete-time switched linear system is transformed into an equivalent switched polytopic model with an additive norm bounded uncertainty.

利用泰勒级数逼近和凸多面体技术，将上述系统转化为等价的具有模有界的多项式不确定模型。

A practical and general failure model of actuator and sensor is considered by using convex polytopic uncertainties to describe control surface impairment.

通过凸多面体不确定性来描述控制系统表面故障，采用了更为一般、更符合实际的故障模型来描述执行器和传感器故障。

Therefore, a design scheme via LMI approach is presented in order to improve the system robustness. By using the LMI approach, the attitude controller design is reduced to a convex optimization problem based on the polytopic system. Since there are some degrees of freedom when solving the LMI, it is available to use this kind of freedom to achieve multi-objective control within this framework.

通过仿真发现采用经典控制方法设计的姿态控制系统在飞艇模型参数以及工作条件变化较大时，无法保证良好的控制效果，因此，为了提高系统的鲁棒性，本文采用基于LMI的方法对姿态控制系统进行了设计，并对所设计系统进行了有约束的多目标优化。

Baby has been five months, but head erect also unstable, and the recent discovery of his lumbar spine more than a few postganglionic obviously convex,, especially have to sit at.

孩子已五个月了，可是头部竖立还不稳，最近发现他的脊椎腰椎以上几节后凸明显，，尤其是抱坐时。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。