查询词典 convex

Some necesarry and sufficient coditions for generalized diagonal dominance for matrices are discussed by using the determinant and the closed convex cone generated by matrices column vectors. This paper, thus provides some new methoods for determining the generalized diagonal dominance in matrices.

利用矩阵的列向量所生成的闭凸锥及矩阵的行列式来讨论其行广义对角占优的若干充要条件，为判别矩阵是否为广义对角占优提供若干新方法。

Keywords Closed convex cone;gradient projection method;Least-squares solution;Inverse matrix problem;Inverse eigenvalue problem;Matrix completion problem;Optimal approximation

Article From 湖南大学；应用数学博士论文 2005年度闭凸锥；投影梯度法；最小二乘解；矩阵反问题；矩阵逆特征值问题；矩阵完全化；最佳逼近

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We show that the joint total average cost curve is piece-wise convex.

其中我们证明得到联合总平均成本函数对时间T具有片段凸性的性质。

If the curve is convex, the highest point must be a tangency point with the budget constraint line.

如果是向原点凹的无差别曲线，那么切点并不是最优点。

The internal force yield condition is a close and convex curve and can correspond to the symmetry of internal force.

该内力屈服条件是一条闭合的外凸曲线，符合内力分量的对称性，在材料拉压强度相同时蜕化为屈雷斯卡内力屈服条件。

Under a given green split, the performance index of average delay in an intersection varies with the cycle in a convex curve.

在一定的绿信比下，交叉口的延误指标随周期变化具有单峰性。

The data of Monte Carlo simulated grains and pure iron show that the grain size is related to the face number by a curve convex upward.

仿真数据和纯铁实验数据均表明，晶粒尺寸与晶粒面数之间的统计关系表现为一条单调递增的凸曲线。

This paper first demonstrates that the changes of air parameters is indicated as a curve convex to the right in the psyehrometrie chart when the air flo ws through the surface air cooler in the cooling process.

本文首先论证了空气在表冷器中冷却过程的参数变化，在I——d图上表示的是一条向右凸的曲线。

Case study indicates that for a gas well with constant production rate, the relationship between the time of water breakthrough and the perforating degree assumes asymmetrical convex curve.

实例分析表明，底水气藏的一口生产井以定产量生产，在其它条件不变的情况下，其见水时间与气藏打开程度呈不对称凸型曲线关系。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。