sirt

Design and Implementation of Sirt Online Examination System

石家庄铁路职业技术学院网上考试系统的设计与实现

Shortest path ray tracing is used in the forward step and SIRT in the inversion step .

正演使用最短路径法射线追踪，反演采用SIRT方法。

Improvement of SIRT Algorithm in Near-Surface Seismic Tomography

一种改进的近地表层析成像SIRT算法

The SIRT tomography was discussed in detailed in terms of principles and methodology , and validity of algorithm .

从方法原理、算法的有效性、数值模型和野外实际资料的层析反演等方面，对SIRT井间地震层析成像技术进行了系统研究。

According to the low concentration characteristics of the down-flow bed , SIRT method was used for image reconstruction and high quality ECT images were obtained .

针对下行床内固体颗粒浓度低的特点，采用了SIRT图像重建算法，得到了高质量的ECT图像。

Both ART and SIRT belong to iterative method in which the precision of solutions is not completely in positive proportion to iterative times .

ART与SIRT方法属于迭代算法，迭代精度并不完全正比于迭代次数；

The ART and SIRT algorithms modified to solve parameter coupling are applied to the simultaneous inversion of velocity-hypocenter in this paper .

本文将层析技术中的ART和SIRT算法应用到地方台网资料的处理，针对震源定位对速度结构反演的影响，将ART和SIRT算法公式进行推广，联合反演速度&震源位置。

Proper selection of the weight function and the filtering threshold based on maximum entropy theory significantly improved the speed and quality of reconstruction with the improved SIRT algorithm .

改进后的SIRT算法使重建图像的速度和质量都有了明显的提高。

In algebra iterative algorithm we found the range of relaxation parameter is very different . The range of relaxation parameter of ART was narrower than that of SIRT .

在代数迭代算法中，通过模拟图像的重建发现，ART算法和SIRT算法松弛因子的选择有很大的不同，SIRT的松弛因子选择范围偏小，而ART的松弛因子选择范围要宽得多；

This paper adopts simultaneous iterative reconstruction technique ( SIRT ) to perform the crosswell tomography based on shortest path tree ( SPT ) curved ray tracing .

利用基于最短路径树弯曲射线追踪的联合迭代重建层析成像（SIRT）技术进行井间地震层析成像。

The use of Tikhonov regularization theory is to solve the ill-posed problem of image reconstruction and the use of SIRT algorithm is to improve the quality of the final reconstructed image .

Tikhonov正则化原理用于克服图像重建过程中的不适定问题，SIRT算法用于提高最终重建图像的质量。

But because of the limitation of the ray 's wide angle and the smooth effect of SIRT algorithm , transversal ambiguity exists in the crosshole seismic computerized tomography .

但由于射线有限广角的限制和SIRT算法的光滑效应，井间地震CT存在横向模糊的问题。

In the computation , the algebraic reconstruction technique ( ART ) is adopted and modified . In order to improve the computation stability and convergence of ART and SIRT algorithms , a reasonable weighting factor is suggested .

计算中采用了代数重建法，并就改善ART和SIRT这两种算法的稳定性及收敛速度，提出了较合理的权因子。

For inversion algorithms , the extending Kalman filtering theory and the iterative reconstruction algorithms including ART and SIRT are compared by computerized model tests , and the characteristics of three kinds of inversion algorithms are analyzed in theory ;

对于反演算法，利用自编程序对迭代重建算法（ART算法和SIRT算法）和扩张Kalman滤波法进行了比较，并从理论上分析了三种算法的特点；

A reconstruction algorithm named the simultaneous iterative reconstruction technique ( SIRT ) was introduced to resolve the main problems caused by the soft field effect and the limited number of measurements in electrical capacitance tomography ( ECT ) .

在电容层析成像（ECT）系统中，为克服电容测量值数目有限以及管道内敏感场分布的软场效应，引入了一种同步迭代图像重建技术（SIRT）。

A 12-electrode electrical capacitance tomography system for flow pattern identification was developed . To obtain the quantitative information of two-phase flow , a hybrid image reconstruction algorithm which combines Tikhonov regularization theory with SIRT ( Simultaneous Reconstruction Techniques ) algorithm was used .

建立了12电极电容层析成像流型自动识别系统，该系统利用Tikhonov正则化原理并结合SIRT（SimultaneousReconstructionTechniques）算法进行图像重建。

According to a SIRT method , by discussing tomographic results of different cross-well observation system , this article presents some useful criteria of selecting a cross-well observation system in order to obtain some approximate relations among shot interval , trace interval and maximum array length .

本文将根据直射线的SIRT方法，通过不同井间观测系统对成像质量的影响，提出了选择井间观测系统应遵循的某些原则，进而获得炮间距、道间距和最大排列长度间的估算关系。