发展速度

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。

It is a very typical phenomenon in the process of modernization that labors flow from the first-tier industry of low efficiency to the second- or third-tier industries of higher efficiency.

劳动力从低效率的第一产业向效率较高的第二、第三产业的持续转移，是各国现代化过程中普遍的现象，但劳动力转移的动因、方式、速度、机制等，却因资源禀赋、发展阶段的差异而有所不同；同样，我国不同省份的劳动力转移当然也存在着构成、动因、机制等差别。

Many developers have slowed down the pace of operations in Hong Kong began to develop second-tier cities and the Mainland.

许多开发商已经放慢的速度在香港的业务开始发展二线城市和内地。

Through the project, domestic GPS receiver/chip manufacturers have been surveyed, GPS signal simulations for coverage, signal quality, tracking loop, and positioning accuracy have been performed, a GPS receiver prototype has been implemented to overcome limitations due to high altitude, high speed, rapid Doppler variations, and vehicle motions, performance tests with other receivers have been conducted, and, finally, a specification for the development domestic spaceborne GPS receiver has been recommended.

本计画之主要成果包括完成国内相关厂商之资料收集、访查、与分析建议，完成太空级GPS接收机之模拟分析包括讯号观测、讯号品质、追踪回路、定位计算等，完成GPS接收机工程雏形系统之建立并针对高度/速度限制、都卜勒变化、快速撷取、与轨道计算进行韧体发展，及进行GPS接收机工程雏形系统与现有GPS接收机之功能与性能测试，及完成国产太空级GPS接收机之规格建议。

The trend of hammer throw performance is wandering and declining since the 1990s.

当今世界高水平链球运动员投掷技术的发展趋势和新技术特点是：旋转速度高，动作节奏快，表现在每圈所用的时间短，单支撑阶段所用时间短于双支撑阶段。

Therefore, how to evaluate these geological hazards and geological environment quality of the high and cold mountain area is important to prove scientific basis to the engineering.

随着我国国民经济的飞速发展，工程活动规模和范围的迅速增大，地质环境的劣化速度和地质灾害的发生频率有日趋加速的趋势。

The measurement of shear wave velocity of soils is an important aspect in dynamic soil mechanics and seismic engineering, and is also a new developing technology which can be used in both seismic exploration and scientific evaluation on the improved foundation in recent years.

土体剪切波速度的测试是土动力学和地震工程学研究中的一项重要内容，也是近年来发展起来的浅层地震勘探和对已加固地基进行科学评价的一项新技术。

Although the experimental temperature, concentration and vel...

研究表明，对于底部冷却的静态定向结晶过程，两相区低温稀溶液层的存在是形成双扩散对流的原因；双扩散对流的形成与发展造成液相区速度、温度和浓度呈盐指型分布，并促使两相区形成孔道流。

The long jump has dweloped into speed type from the strike jump and the trig jump.

跳远的起跳技术由打击型、制动型已经发展成速度型。

Key themes in the development were speed, customisation, a great design and ease of navigation, and we believe we've created the world's best content-based experience, in your pocket, wherever you are.

&在发展&的关键主题是速度，定制，一个伟大的设计和方便的导航，我们相信我们已经创建了自己的口袋里世界上最好的基于内容的经验，无论身处何地。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了