老化

By studying and summing up the common failure physical models and combining with the quantum mechanics theory on the relationship between the electronic equipment aging reaction rate and tempreture-humidity,a hygrothermal aging life model for solid propellant storage and usage is established with the propellant mechanical properties as the research object.

通过对常用失效物理模型的分析和总结，结合量子力学理论关于电子产品老化反应速率与环境温、湿度的关系，以推进剂力学性能参数为研究对象，建立了固体推进剂贮存使用寿命的湿热老化模型，并通过试验数据拟合得到具体的经验公式。

The result s of orthogonal experiment of the organoleptic evaluation indicates that the best composition is 100g rice flour

油脂做为面包主配料，对面包老化起着显著的延缓作用，乳化剂是一种理想的面包抗老化剂。

However the resin aged fast with addition of anatase nano-TiOa P25 for its photoactivate activity. The mechanism of resin under UV radiation as following was put forward: free radicals produced from the surface of nano-TiOj attack the hydrogen of the methylene, then double bond is formed after the dehydrocholrination, and then the chain is broken after the double bond was oxidized by ozone.

锐钛型纳米TiO_2P25明显加速氯醚树脂的老化，通过IR和XPS分析推断树脂老化的机理为：纳米TiO_2表面产生的自由基攻击树脂中亚甲基的氢原子，发生脱氯化氢生成双键；双键被臭氧氧化发生断链裂解。

In this manner, the replicative senescence is avoided due to the rapid cleavage rate of the cell line.

其中，H1299缺少了老化常有过度表现的p53基因，在此也可探讨p53基因的有无，是否对细胞的老化造成影响。

Aging mechanism of wood-plastic composite was: light and heat break down the long molecular chains of wood flour and plastic; the free radicals reacted with the oxygen, which generated carbonyl groups, hydroperoxides and so on; the free radicals also had cross linking reaction, which generated alkoxy; Water destroyed the interface of wood flour and plastic, hydrolyzed ester additives, extracted the small molecule additives and degradation products; Microorganism degraded cellulose, semicellulose, lignin and ester additives; degradation product from different component accelerated the aging, which could be exampled by the fact that HCl from degradation of PVC accelerated the hydrolyzation of cellulose and semicellulose.

木塑复合材料的老化机理为：光和热引发木塑复合材料中木质组分和塑料组分大分子链断裂，产生的自由基与氧气作用，发生链支化反应生成羰基、氢过氧化物等，发生交联反应生成烷氧基等；水分破坏木-塑界面、水解酯类添加剂、抽提小分子添加剂和降解产物；微生物分解纤维素、半纤维素、木素和酯类添加剂；木塑复合材料中各组分的降解产物相互促进老化，PVC降解产生的HCl溶于水，促进了纤维素和半纤维素的水解。

Seed and defatted Sesamum indicum L. were tested for two antioxidative assays, including DPPH free radical scavenging effect and Trolox equivalent antioxidant capacity assay. They were also examined for anti-aging activity using the "prolongation of C. elegans lifespan" as the model, and EUK-8 as the positive control.

再以两种评估方法检测抗氧化活性，包括清除 DPPH 自由基和 TEAC (Trolox equivalent antioxidant capacity)，另外以「线虫寿命延长」为模式，评估抗老化活性，并以 EUK-8 作为抗老化研究模式之正对照组。

The staling of steamed bread mainly occurred within the first 24 hours. All the steamed bread had the same staling trends.

馒头的老化主要出现在初始24小时内，不同RS3添加量馒头的老化趋势相同。

A speaker from each unit of the design, development, production to the aging test ;Speaker of the design, development, production to the aging test,We strictly operate the plant and each procedure, so that the perfect technology exquisite embodiment.

从每一个喇叭单元的设计，开发，生产到老化测试；音箱的设计，开发，生产到老化测试，我们严格操作生产每道工序，使精湛的技术得到完美体现。

Based on parameter of softening point, aging kinetics model was established to show aging condition of two asphalts and to calculate activation energies.

同时以软化点为参数建立老化动力学模型来反映两种沥青的老化情况，并计算出活化能。

The effects of various antioxidants on the discoloring behavior and the mechanical properties of the PA6 specimens during the course of thermal-oxidative aging were systematically studied.

研究结果表明：使用胺类抗氧剂能明显地改善PA6的抗热氧老化变色性能，还能使其保持较高的热稳定性能和力学性能，并大大延长PA6的静态使用寿命；用酚类抗氧剂/亚磷酸酯抗氧剂组成（1：1）的稳定体系能对改善PA6的耐热氧老化性能产生协同效应。

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。