natural ageing

The yield strength is reduced by 10~ 20 MPa after natural ageing and it can be simulated by artificial ageing ( 100 ℃× 2h or 200 ℃× 1h).

自然时效后屈服强度下降10～20MPa，用人工时效可以模拟自然时效，工艺是100℃×2h或200℃×1h。

Characteristic: Purely natural plant essence, specially include the anti-ageing element, gush out gently, can bring the perfect maintenance result.

纯天然植物精华素，特含抗衰老元素，轻轻一喷，即可带来完美的修复效果。

Relationship between Natural Ageing and Artificial Ageing of Graphic Arts Films

印刷胶片的自然老化与人工老化的关系

Through the natural ageing test of hot-rolled reinforced bar, the fluctuation characters of mechanical property have been found out, and the ways of reducing factory check and index of mechanical property have been put forward.

通过对安钢棒材机组生产的带肋钢筋性能进行自然时效试验，找出了热轧带肋钢筋力学性能指标值的波动特点，并提出了减小工厂检验与用户检验力学性能指标值的差异的方法。

Treated in the artificial ageing condition of 100% relative humility and 40 ℃ for 5 days, the ageing degree is equal to that during one summer natural temperature ageing condition.

在100%的相对湿度、40℃的人工老化条件下处理5d左右，对种子的老化程度与一次自然室温越夏的老化程度大致相当。

It is not known how unrepaired DNA damage accelerates ageing or its relevance to natural ageing.

现在还不清楚未修复DNA损伤是如何加速老化或其与自然老化关联性.