主要动力

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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。

Lucas: It's a very different thing: when I tested this car last year the main focus was on the engine for Asia, that was going to be reduced on power, so it was nothing to do with this car because the roll bars and a lot of technical aspects were very different from what there is now, and it was back in October that I tested, so it's a long, long time that I didn't drive a GP2 car.

坏蛋：这是完全不同的事：去年我测试的时候主要是为了亚洲赛的引擎，那时候因为要减少引擎动力，所以对现在的车没啥帮助，因为roll bars和很多技术方面的东西都和过去的不太一样，上次我测试还是10月份，所以我有很长很长时间没碰GP2的车了。

In this tectonic setting, the special sedimentary environment and regional magmatism as well as tectonic force are the main factors which control the regional metallogenesis .

活动陆缘区特殊的沉积环境、区域岩浆活动及构造变形动力等作用，构成了区域矿产形成的主要背景和控制因素，从而使不同类型和元素组成的矿床得以形成，并表现区域成矿的总体分带规律。

Study shows that compaction and cementation can play a destructive role in Suining formation reservoir,while dissolution and fracturing can play a constructive role in that.The main facies of Suining formation are ferruginous-shale film,anhydrite,dolomite and calcite.The micro-fracture and grain-edged fracture mainly resulted from compaction fracturing,compaction slipping and tectonic dynamic force greatly improve the reservoir permeability.

研究表明：①对遂宁组储层起破坏作用的是压实作用、胶结作用和交代作用，而溶蚀作用、压裂作用则对储层起到建设性作用；②遂宁组最主要的成岩相组合为铁泥膜－硬石膏－白云石－方解石成岩相；③由压实破裂、压实滑动和构造动力形成的微裂缝、粒缘缝有效改善了储层的渗透性。

First we showed that high latitude thermosphere's response to heat sources is different from that to momentumn sources, which can be generally explained by geostrophic adjustment, with the main energy of the momentumn sources remained in the local region, and the main emergy of the heat sources transported to mid and low latitude.

首先把动力气象学中大气适应的方法应用到极区热层大气，分析了热层大气对动量源和热源的不同响应机制，认为极光区加热源是引起中低纬热层大气扰动的主要因素。

In this thesis, the index theory of fixed points and its application for the type-K monotone and competitive syst...

本文主要研究不动点指标理论及其在K型单调和竞争动力系统中的应用。

Fiscal policy will be tightened further, now that pump priming is not needed to maintain economic growth. The issuance of long-term government bonds was limited to CNY110 billion in 2004, a reduction from the budgeted amount of CNY130 billion, partly so that there would be less available for capital construction.

由于保持经济增长不必是主要的动力，财政政策将进一步紧缩。2004年，政府发行的长期债券被限制在1，100亿元，低于编入预算的1，300亿元，部分原因是为了减少用于基本建设的投资。

Its main features are: spiral Ploughshares machines installed in front of the drive when high-speed rotary cutting the soil.

它的主要特点是：螺旋犁头安装在机器前面，工作时经动力驱动高速旋转切割泥土。

Its main advantages are: 1 Ploughshares former can Geng Sada narrow, sharp-angle, and then a small field can be competent. 2, spiral Ploughshares high-speed rotation, tillage Shulan soil formation, may omit rake mud, soil and other pressure Suitu site preparation process. 3, spiral Ploughshares work will push the soil later, will pull the machine forward traction, it can effort can be smaller engine-driven. 4, the spiral Ploughshares work itself traction to overcome the original style, to break through resistance to the plow, the machine tray can be fitted with the lower part of farming feet deep mud paddy field. 5, the spiral Ploughshares put on the handling round, you can use the drive shaft Ploughshares handling round, 20-30 cm wide in the small mountain ridge or drive to complete removal. 6, according to the plane of principle, can also be designed as a multi-Ploughshares, or a variety of forms, suitable for large-scale farming machinery Plain.

它的主要优点是：1、犁头在前能耕狭田窄地，田尖地角，再小的田地都可胜任。2、螺旋犁头高速旋转，被耕泥土熟烂平整，可省去耙泥、压土等碎土整地过程。3、螺旋犁头工作时将泥土往后推，有将机器往前拉的牵引力，因此可以省力，可用较小的发动机驱动。4、由于螺旋犁头工作时本身有牵引力，克服了原式华犁的对闯阻力，在机器下部装上托盘就可耕作深泥脚水田。5、把螺旋犁头换上小搬运轮，就可利用犁头轴的动力驱动搬运轮，在20—30厘米宽的小山路或田埂上行驶完成搬运。6、根据该机工作原理，还可设计成多犁头或各种形式，适合平原的大型耕作机械。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。