In this paper we discuss the approximations introduced in the average-ion model usually employed for level population calculations.

本文讨论了通常计算能级占据数时所用的平均离子模型中引进的近似。

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Toyota announced this week that it would be delaying plans to bring its plug-in, lithium-ion-based model to market until 2011, as opposed to 2008, due to safety concerns over the company's chosen battery.

ENGADGET: Toyota delays next-gen Prius while GM inks deal with lithium-ion maker