不耐久性

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。

Our country firstly put forward such design principle of Qinghai-Tibet railway engineering as "lower temperature actively, reduce the heat into the subsoil, and assure the heat stability of frozen earth for the quality stability of construction", creatively adopt such corresponding measures of frozen earth construction problem as: for the poor frozen earth developing section, line should avoid as possible;for the geology of ice at high temperature and unstable frozen earth zone, the method of bridge instead of subgrade shall be adopted;in subgradeconstruction, such facilities as heat stick, rubble ventilation subgrade , rubble ventilation berm, ventilation pipe subgrade and laying heat preservation board etc shall be adopted to raise the stability of frozen earth subgrade;during the excavation of bridge, culvert , foundation pit and scouring prevention trough, creatively adopt single-tooth knapper and solve the problem of frozen earth excavation;during the construction of bridge and culvert, durable concrete and three-step maintenance method are adopted to assure the outside and inside beauty of structure.

我国在世界上首次提出"主动降温、减少传入地基土的热量、保证多年冻土的热稳定性，从而保证修筑在上面的工程质量的稳定性"的青藏铁路工程设计原则，创造性地采取了解决冻土施工难题的相应对策：对于不良冻土现象发育地段、线路尽量绕避；对于高温极不稳定冻土区的高含冰量地质，采取"以桥代路"的办法；在路基施工中采用了热棒、片石通风路基、片石通风护道、通风管路基、铺设保温板等多项设施，提高冻土路基的稳定性；在桥涵基坑、挡水埝基槽开挖中，创造性地应用了单齿破碎器，解决了冻土开挖难题；在桥涵工程施工中，采用了耐久性混凝土，采用了三步养生法，保证了结构物内实外美。

The crack spacing of CRCP changes randomly and has a significant impact on the pavement durability and performance. The direct integration method is used to analyze the reliability for crack spacing and width. The results show that the main factors that affected the reliability are the design crack spacing and the variability of parameters. This paper presents a nomogram for reliability calculation.

CRCP的裂缝间距是随机变化的，裂缝间距的不同会对路面耐久性产生显著影响，本文使用直接积分法计算了CRCP裂缝间距的可靠度，并使用蒙特卡罗法进行了对比，分析参数的敏感性，指出影响可靠性最主要的因素是设计裂缝间距及参数的变异性，给出了CRCP可靠度计算诺谟图。

HIGHCLEAN is a nonflammable water-soluble cutting fluid of high performance and storage durability.

HIGHCLEAN 是高性能和存贮耐久性不易燃的溶于水乳化切削油。

In tested sample of the converter the using of higher rpm was inadmissible because of unsufficient mechanical durability of the magnetic system, which was built from separate pieces.

在测试的样品转换器的使用较高的转速是不能接受的，因为unsufficient机械耐久性的磁系统，这是由单独的内置件。

The stuff lasts forever, yet it's mismatched in terms of durability with all that padded vinyl.

东西永远持续，但它的不匹配而言，耐久性与所有垫地毡式。

However, due to not clear knowing to the definition of concrete durability and different understanding to the so called "high performance", people always lose their way in the process of design and construction, for example, overemphasizing the property of high strength and permeability, but ignoring the crack problem that appears more easy, more serious, and more dangerous to concrete structure.

然而，由于对混凝土的耐久性概念认识不清，以及对混凝土所谓&高性能&的理解存在差异，往往在设计和施工过程中陷入很多误区，如过分追求高强度、低渗透性能等，却忽视了随之出现的更易产生、更为严重、同时对混凝土结构整体性潜在危害更大的裂缝问题。

This is especially important for Pb-free solders because such a durability model is not currently available.

这是 特别重要的无铅焊料，因为这样的耐久性模型是当前不可用。

She became a qualified plateau overhead travelling crane driver after training and examination. The loading and hanging techinic requirement was very high and difficult.

制梁场装吊桥梁技术要求高，难度大，一片07耐久性混凝土桥梁重达120多吨，需2台75吨龙门吊同时起吊，同步运行，不能有丝毫差错。

Thin elastic foundation of cement concrete pavement design theory, in-depth analysis is to arrive at the grass-roots non-uniform bearing broken concrete pavement panels, gnawing edge, the wrong units, as well as the main reason for structural damage produced by taking certain measures to improve the concrete between the road surface and the grass-roots support conditions, and improve durability of the cement concrete pavement and stability.

通过水泥混凝土路面弹性地基薄板的设计理论，深入分析得出基层的不均匀支承是水泥混凝土路面断板、啃边、错台、以及产生结构性破坏的主要原因，通过采取一定措施改善砼路面面层与基层之间支撑条件，提高了水泥混凝土路面的耐久性和稳定性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。