查询词典 inversion

This paper devotes to mining the incomplete information of error data as prior knowledge, which can apply to the multi-stage inversion and improve the precision of some models parameters. Wetake the SAIL model as an example, and the results show that it is feasible. This thesis consists of four chapters.

本文致力于挖掘误差中未尽的信息作为先验知识，应用于多阶段遥感反演中以提高参数反演精度，并以SAIL模型为例，结果说明了把从误差数据中提取的先验信息用于提高遥感参数反演精度的可行性。

Using LMS and LS as the merit function separately,in this paper we take the multi-stage inversion of the SAIL model as an example to inverse the ground parameter.

本文以遥感BRDF物理模型——SAIL模型为例，使用模拟数据与真实地面观测数据，构建LMS与LS两种代价函数，分阶段地进行地表参数的反演方法研究。

The real data verification shows that the wavelet, reflection factor and acoustic impedance given by PCGA are more accurate, quicker convergent and value stable than the existing direct sparse inversion method.

用实际数据检验算法，表明预条件共轭梯度法反演的子波、反射系数和波阻抗要比直接稀疏反演精度高、收敛快、数值稳定。

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。

In the medium term,"non-size" limit "U"-type inversion level.

从中期来看，&非大小&限制的&U&型反转的水平。

It's a very powerful and dangerous magical item which literally turns back time for the user, one hour per inversion of the glass.

它是个非常强大而危险的魔法物品，可以一小时一小时地把时间转回去，以每小时为单位倒转。

This paper introduced some methods that can accurately calculate the porosity and permeability of carbonate rocks. These methods are rock physical inversion, digital image analysis, and permeability model based on lab data.

介绍了提高碳酸盐岩孔隙度和渗透率计算精度的几种方法，即岩石物理反演法，数字图像分析技术，基于实验数据的渗透率模型法。

This paper introduced some methods that can accurately calculate the porosity and permeability of carbonate rocks. These methods are rock physical inversion, digital image analysis, and permeability model based on lab data.

介绍了提高碳酸盐岩孔隙度和渗透率计算精度的几种方法，即岩石物理反演法、数字图像分析技术、基於实验数据的渗透率模型法。

It is a simplified model compared with the models usually used in the micro-climate study of tree stands This model is hopeful to support the inversion study of the canopy reflectance model.

提出了一套系统而行之有效的用数字图像法对作物结构参数定量计算的方法，该方法具有代表性和普遍应用意义。

With the patented vented mesh system, wind is dispersed through reinforced mesh pockets in the lower canopy to eliminate umbrella inversion while reducing overall torque on the shaft and your arm, all while shielding you from precipitation.

随着专利排气管网系统，风是透过散热片钢筋网袋下篷伞消除反转，同时减少总扭矩竖井和你的手臂，同时也屏蔽你的降水。

The United Kingdom has pledged to provide technical assistance to the peacekeeping effort in Darfur, including airlifting supplies and equipment to assist the African peacekeepers.

英国承诺为达佛的維和努力提供技术帮助，包括提供非洲的維和部队空运补給和裝备。

Results: The level of ET-1mRNA in placental villus was significantly higher in pre-eclamptic women than that in control group.

结果：妊高征组患者胎盘绒毛组织ET-1 mRNA的表达较正常妊娠组明显增高。