老化

With the freeway volumes and natural environment, property of flexible pavements deteriorates gradually owing to asphalt aging and aggregate finning and structure changing of asphalt pavement.

硕士毕业设计道路沥青的老化与再生研究（共69页，34156字）摘要在交通载荷和自然因素的作用下，由于沥青逐渐老化、混合料集料细化以及路面受力结构层的变化，沥青路用性能逐渐恶化，甚至严重影响行车安全。

The brain starts ageing at 20; skin starts to age naturally in the mid-20s; muscles start ageing at 30, but regular exercise can help prevent this; and the voice starts ageing at 65, becoming quieter and hoarser.

研究显示，大脑20岁开始衰老；皮肤25岁左右开始衰老；肌肉30岁开始老化，但常锻炼有助于预防肌肉老化；发音器官则从65岁开始衰老，声音变得轻声细气，越来越沙哑。

HGST offers a complete workout without overexerting yourself. Train virtually every muscle in your body, prevent muscle loss and reduce strain on joints, ligaments and tendons.

高引力运动可有效地减慢老化过程，运动全身肌肉而不会过劳，预防因老化引起的肌肉萎缩和减少对关节、筋腱及韧带的负荷。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。

The physical aging was introduced to the polymer's poling process and the effect of aging time was investigated in this article.

将聚合物的物理老化引入到极化过程中，并研究了不同温度下的老化对极化聚合物取向稳定性的影响。

The physical aging was introduced to the polymer's poling process and the effect of aging time was investigated in this article.

摘 要：将聚合物的物理老化引入到极化过程中，并研究了不同温度下的老化对极化聚合物取向稳定性的影响。

He thermal oxidation process of saturates and aromatics with different addition agents were studied by means of In-situ FTIR.

FOT通常利用试验后的沥青粘度变化来评价沥青的老化性能，红外光谱法可研究沥青老化前后官能团的变化。

Consequently, study on the water treeing phenomenon in polymeric materials and the influence of external conditions is of great significance, either to understand the mechanism of polymer aging or to safely operate the power cable.

因此，研究聚合物水树枝老化现象和外界因素对水树枝生长的影响，无论是对聚合物老化机理的认识，或是对电缆的安全运行都有着重要的意义。

Space charge was greatly decreased by blending a small amount of chlorinated polyethylene into LDPE. At the same time, The initiation voltage of short circuit treeing after the positive and the negative dc pre-stress were increased by 26. 8% and 36. 3% respectively.

通过对电老化的纯聚乙烯及含自由基清除剂的聚乙烯的高场强电导的研究，结合空间电荷限制电流理论，计算了老化过程中聚乙烯和含自由基清除剂的聚乙烯试样的陷阱能级密度分布。

In this paper, aging time of alkali cellulose was confirmed by researching the effect of aging time of alkali cellulose to its ability of withstanding alkali; The effect of temperature, the mass ratio of intermediate to cellulose, time, NaOH concentration on the mass and capacity of product.

研究了碱纤维的老化时间对抗碱能力的影响，确定了碱纤维的老化时间；研究了氢氧化钠的用量、中间体与纤维素的质量比、反应温度和反应时间对产物质量和产物交换容量的影响，并用红外光谱对产物的结构进行了表征。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。