耐久性

The seepage of water is one of the main reasons that freezing damage occurs in permafrost regions tunnel.Grouting is a direct and effective way of controlling seepage. However, because of the frost heaving force , ring of permafrost, the durability of material and the temperature field ,grouting in freezing-thawing condition becomes more difficult.

隧道内渗漏水是多年冻土隧道产生冻害的主要原因之一，注浆是围岩加固、防水和治理渗漏水的一项十分直接有效的方法，然而，冻胀力、冻融圈、材料耐久性和施工温度场等因素，为冻融条件下的隧道注浆施工增加了很大的难度。

Concrete durability is a wide range of diseases, has a general role in the deterioration factor, there are special deterioration factor.

混凝土耐久性病害是多方面的，有一般作用的劣化因子，也有特殊劣化因子。

However, if we think of beauty, durability and maintenance, nothing can beat Marble and Granite.

然而，如果我们认为秀丽、耐久性和维护，什么都不可能打大理石和花岗岩。

For Sedu manufacturers, a babyliss pro flat iron that combines performance and durability without causing damage on the hair Remington is a world-renowned brand for hairstyling tools that are popular for several hair effects, like the wet to straight effect which eliminates the need for blow drying and babyliss hair iron in the stroke that showcases Remington's powerful performance.

为Sedu制造商，babyliss亲扁铁，结合性能和耐久性不损坏的发雷明顿是国际知名品牌，为顾客的工具，是流行好几发效应，如湿，直效果，不需要用吹风机烘干和babyliss发铁的中风，展示强大的表演。

The new series can be used for retort food packaging applications with the addition of a hardener that enhances resin durability.

新系列可用于蒸煮食品与一名能增强树脂固化剂的耐久性除了包装应用。

The results show that the compound conductive fiber has typical structure of sheath-core consists of black greened polyaniline electric conductive deposition as the skin and the white polypropylene matrix fiber as the core, which makes the compound fiber preferable physical mechanical property. The intensity and the elongation ratio of the electric conductive fiber are decreased but the thermal stability is enhanced after modified. The compound fiber has the good acid resistance but poor base resistance. The thermal stability of the compound fiber prepared by 4-methyl-benzene sulfonic acid is better than that prepared by hydrochloride acid. Moreover, the compound fiber can be re-doped by other organic or inorganic acid after freed from the adsorbed acid. Furthermore, the electric conductivity of the compound fiber decreases with the temperature increasing but hardly changed with the humidity. The adsorptive ability and therefore the content of the polyaniline, the constant of electric conduction, and the durability of the compound fiber can be enhanced by thinning the diameter, section heteromorphosis, section heteromorphosis and plasma treatment of the surface or blending with COPET of the fiber.

结果表明：复合纤维是聚丙烯与聚苯胺的共混体系，具有典型的皮芯型结构，皮层为墨绿色的聚苯胺沉积层，形成连续的导电通道，芯层为白色的聚丙烯基质纤维，提供物理机械性能；导电改性后纤维的强度、强力和伸长率均有下降，但热稳定性得到提高；复合纤维的耐酸性比耐碱性好，以对甲苯磺酸做掺杂酸比盐酸掺杂聚苯胺热稳定性好，脱掺杂后的复合纤维，可用其它无机酸或有机酸进行再掺杂；复合导电纤维的电导率随温度升高降低幅度较大，但几乎不受湿度影响；基质纤维细旦化、截面异形化、表面等离子体处理或共混COPET等改性处理均能提高纤维的吸附性，进而提高复合纤维表面聚苯胺含量、电导率和耐久性。

AIM: Valved homograft conduit is frequently used to treat complex congenital heart disease and shows a satisfactory short and moderate-term effect, but its long-term effect still needs to improve.

目的：同种带瓣管道已经广泛应用于复杂先天性心脏病的治疗，临床应用中显示了良好的近中期效果，但其长期耐久性还有待提高。

The impermeability of concrete is concerning directly the wear of concrete.

梗概： 混凝土的抗渗性直接关系着混凝土的耐久性。

Cracks in bulky concrete will reduce the strength and frost resistance of concrete,which has bad effect on the impermeability and durability of concrete.

大体积混凝土裂缝会降低混凝土的强度和抗冻性，对混凝土抗渗性和耐久性的影响尤为严重。

The experiment shows that both the impermeability and the freeze-thaw resistance of the concrete are higher than the related requirement of the design.

实验表明，其抗渗性与抗冻性均满足耐久性设计要求。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐