The channel model is a linear time variant system.

信道模型为一线性时变系统。

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The robust stability condition of periodic time variant system is derived.

推导了周期时变系统的鲁棒稳定性条件。

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Aimed at the problem of iterative learning control for nonlinear discrete time-variant system, the improved iterative learning control algorithm is given.

针对非线性离散时变系统的迭代学习控制问题，提出了一种改进的迭代学习控制算法。

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However, on the Windows RT variant of the system - which will power cheaper tablets running on ARM-based chips - app publishers will only be able to sell their products through the Windows 8 store designed for the touchscreen interface, with all its associated restrictions.

BBC: Minecraft screenshot

And there may also be an amendment to switch elections to the Holyrood Parliament to first past the post, from the current variant of the additional member system.

BBC: Viewing guide: The week ahead in Parliament

Microsoft said the model using Windows RT a variant of the Windows 8 operating system and chips from Nvidia Corp. should arrive first and be in line with pricing of similar tablets.

WSJ: Microsoft's Surface Rivals Both Tablets and Laptops