Positive vertical temperature gradient in concrete and steel superstructures.

混凝土和钢筋上部结构正垂直温度梯度。

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Due to the influence of radial positive pressure gradient, low-energy gas moves along trailing area to hub. That causes rapid dissipation and weakening of downstream passage vortex.

在叶栅下游，由于径向正压梯度的影响，低能气体沿尾流区向轮毂输运，引起下通道涡的迅速消散与衰减。

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This paper is investigated a preconditioned conjugate gradient method in solving a linear algebraic system of large sparse symmetric and positive equations.

本文研究了解决大型稀疏对称正定线性方程组的一类预条件共轭梯度法。

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