耐久性

Introduction: It is simulated office chair parts durability in daily use,seat,arm and back combined durability tester fully complied with the standards. It is made of Alu. Main purpose: it is used for testing the fatigue durability of the chair seat, back and arm.It is two testing combined equipment,used for testing the durability of chair.

Chair Seat Back and Arm Durability Tester 简单介绍：办公椅座背扶耐久测试仪是模拟办公椅的待测部位在日常使用中的耐久性，办公椅座，扶手，靠背组合耐久测试仪完全符合项标准，仪器采用铝型材制作，造型美观大方。

Durability tests of the specimen,including tests of abrasion resistance,infiltration resistance,frost resistance(routine frost and coupling with the frost and salt), shrinkage were done.

为了提高路面混凝土的耐久性，通过机理分析，将炼钢时的废渣磨细后，作为第6组分掺入水泥混凝土中，制作了高性能路面混凝土试件，并对掺磨细矿渣高性能路面混凝土试件进行了耐磨性、抗渗性、抗冻性(包括一般冻融和盐冻耦合)及收缩性的试验。

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

You can be five different types of combat check their durability, fighting each have their own rules: the death of race, combat command, the survival mode, capture the flag and the last survivors of the war.

你可在五个不同类型的战斗中检查它们的耐久性，每场战斗都有各自的规则：死亡竞赛、指挥作战、生存模式、夺旗战和最后幸存者。

The influence of polypropylene fibermesh on the durability of high performance concrete was examined.

综合论述了网状聚丙烯纤维对高性能混凝土耐久性的影响。

The durability of automobile motor vehicles an important indicator of the quality of one good or bad.

汽车的耐久性是汽车质量好坏的重要标志之一。

In weakness, it is of low fire-resistant ability, and easy to be corroded.

钢结构的弱点是抗火能力差、易锈蚀，克服其弱点的措施是涂装材料和涂装技术及检验手段的不断改善，特别是涂装材料的耐久性是关键。

Water-repellent layer of resistance to freeze-thaw resistance high-pressure water washing and durability.

憎水层耐冻融、耐高压水冲刷，耐久性好。

So bring forth the countermeasure of appraisal and repairing and reduce the loss of durability damage are study subj...

因而对已有钢筋混凝土结构提出评估与修复对策，减少耐久性破坏造成的损失，是一项具有重大意义和社会经济效益的研究课题。

The weaving and dyeing process we use enhances durability and fluffiness.100% Egyptian-cotton loops,100% cotton base, Thick, high-quality loft, Plush, soft, luxurious feel, Preshrunk, Available at the following grams 420,500,540,600 and 700 gram cotton at very Competitive prices.

编织和染色过程中，我们使用能提高耐久性和蓬松的100%埃及棉花棉花圈、 100%棉基，高品质厚实表面，毛绒柔软，给人以豪华的感受，加入防缩布料，420、500、540、600、700克棉花均有销售且销售价格颇具竞争力。

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％。