使氧化

The experimental results denoted that the finer pearlite along the austenite boundaries in the as-cast Cr30Ni20NRE steel disappeared first under long-term and high-temperature service condition, and that an umber of Cr- richened carbides were formed due to unila-teral carburizing at long-term and high- temperature, consequently causing Ni to concentrate, bulging and calalyzing decomposition of the carburizing gas.

试验结果表明，长期在高温条件下服役，铸态Cr30Ni20NRE耐热钢中沿奥氏体晶界的珠光首先融入奥氏体，长期高温单边渗碳形成大量富铬碳化物，促使镍富集并起泡形成瘤状物，催化含碳气体的分解；表层瘤状物使辐射管表层疏松，表面积扩张，加快了碳向基体的渗入，提供了碳化物持续长大的条件，并引起沿碳化物周边开裂和奥氏体基体严重萎缩；合金元素的重新分布造成主合金元素铬和镍产生两极分化，镍和硅的富集促使石墨化，与侵入的氧形成内部氧化空洞和膨胀疏松，最终导致构件穿孔失效。

In addition, they contain proven additives to protect equipment against rusting and to resist oxidation for long service life.

另外，这些润滑油中含有经过实践证明的添加剂，可防止设备生锈和抗氧化，从而使设备的使用寿命较长。

When tin is added, the pulverization rate decreased, tin segregates to the surface of the alloy, and the protection layer SnO〓 is formed. It inhibits the segregation and oxidation of La to the surface, so the cycle life is improved.

提出了容量衰减机制：Sn元素的加入降低了合金的粉化，使Sn向表面偏聚，生成SnO〓保护膜，阻止La向表面偏析-氧化，从而提高了电极的循环寿命。

Psoralea crolyforlia sensitizes the skin to the tanning effect of sunlight, while Coconut oil works as a strong anti-oxidant and helps us to activate melanin pigment in the skin.

补骨脂在阳光照射下使皮肤更加敏感晒成褐色，而椰子油做为抗氧化物质来帮助我们激活皮肤上的黑色素

The results shoed that the interfacial shear strength of CF／ PF compo site was improved by 25％ and that CF／ EP composite improved by 100％.

结果表明：在本试验范围内经电化学氧化处理可以使粘胶基碳纤维／酚醛树脂复合材料界面的粘合强度提高25％，而粘胶基碳纤维／环氧树脂复合材料界面的粘合强度可提高100％。

Because the follicle opening is wider, the sebum (sebaceous glands produce a substance called sebum, which is responsible for keeping the skin and hair moisturized) and the sloughed off dead skin cells react chemically with the air, resulting in the oxidation of melanin , which in turn causes the dark coloration of the blackhead.

因为毛囊的状态开放得比较大，皮脂（脂肪分泌腺产生的一种物质叫皮肤，它是用来起到为皮肤和毛发的保湿作用的）和脱落的皮肤死皮细胞在空气中发生化学反应，导致黑色素的氧化，从而使黑头变黑。

Silver jewelry tarnishes due to oxidation, so making certain you take care of your silver rings is a must.

银首饰玷污由于氧化，因而使某些你把你的银戒指照顾是必须的。

Silver jewelry tarnishes due to oxidation, so making certain you take care of your silver rings is a must.

银首饰玷污由於氧化，因而使某些你照顾你的银戒指是必须的。

The products were identified by IR,NMR,MS and elemental analysis. In our method,K.OH was used in place of NaOH to synthesize benzyl ester of 3,5-dimethyl-4-hydroxybenzoic acid,2',6'-dimethyl-4'-(n-succinimidyloxycarbonyl) phenyl-acridinium-9-carboxylate was purified on a silica gel column with chloroform/ethylacetate(4:l,v/v) as eluent and further purified by triturating with hexane/acetone(2:l,v/v).The luminescence produced by DMAE-NHS is a flash light with maximumemission at 0.4s and decay half-time of 0.9s. The luminescence intensity is 6.11x10 cps/mol,which is affected by the composition of trigger and surfactant.

DMAE·NHS的合成是本论文的关键和难点，我们对文献方法进行改进：文献方法用氢氧化钠与3，5-二甲基-4-羟基苯甲酸反应制得3，5-甲基-4-羟基苯甲酸钠，再用3，5-二甲基-4-羟基苯甲酸钠与苄氯作用制备3，5-二甲基-4-羟基苯甲酸苄酯，我们用氢氧化钾代替氢氧化钠，使合成取得成功；在合成2'，6'-二甲基-4'-苯基-吖啶-9-甲酸酯时，文献方法对粗产品进行两次硅胶柱层析纯化，第一次柱层析用氯仿/乙酸乙酯(4：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，第二次柱层析用己烷/丙酮(2：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，按照文献方法得到的不是所需要的化合物，我们只进行第一次柱层析纯化，然后用己烷/丙酮(2：1，Ⅴ：Ⅴ)进行研磨，过滤，洗涤，除去溶于己烷/丙酮(2：1，Ⅴ：Ⅴ)的部分，得到所需要的产品。

The most important reasonwas the melting point of V2O5 only being 690℃, which could be volatilized as liquidstate if the temperature exceed this value and led to disastrous oxidation.

合金的 Cr 含量太低，不足以促成连续致密的 Al2O3膜的形成，故以掺杂作用为主，使合金的抗氧化性能降低。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。