plane of no deformation

Study on deformation of surface figure of large-aperture mirror in temperature field;

温度对大口径主镜面形变形的影响分析

This paper discusses three inventory models for short life cycle products with concerning the factor of value deterioration.

讨论短生命周期产品库存模型,考虑无形变质因素,并假定无形变质率与需求率成反比关系。

Deterioration items included physical deterioration and value deterioration.

变质性物品包括物理变质和无形变质两种,无形变质指的是存贮中物品的数量不会发生变化,但是价值随着时间的消逝会逐渐减少,比如电脑、电子元件等。