查询词典 statistical accuracy

The finite difference time-domain method is stable and easy to be used, but due to the fact that it approximates the space derivatives in Maxwells curlequations by central difference, FDTD usually requires more than 20 grids perwavelength to achieve acceptable accuracy. As a contrast, pseudospectraltime-domain method approximates the space derivatives by pseudospectralmethod, which guarantees the accuracy, theoretically requiting only 2 grids perwavelength.

传统的电磁场数值算法——时域有限差分法稳定而易于实现，但由于FDTD采用中心差分近似Maxwell旋度方程的微分，每个波长上需要取的网格数通常较多，而时域伪谱法采用伪谱法求微分，理论上每个波长只需要取两个网格便可以达到较高的精度。

However, because the measuring process is influenced by many factors, it is difficult to improve the accuracy of dynamic measurement. It is the focus of the measurers and the designers all through the ages. Thus, the research on dynamic error and accuracy theory is always heavily concerned.

由于动态测量的影响因素较多，如何提高其测量精度，一直是工程测量与仪器设计人员关注的重点，因而，对动态误差与精度理论的研究也历来受到人们的重视。

Laser-based metrology and grating-based metrology are two main ultra-precision tools of dimension measurement. However, very few research work has been done on grating-based nanometrology compared with laser-based nanometrology till now because many people, including some grating researchers and specialists, hold the idea that the accuracy of grating-based measurement is lower than the laser's and can only reach micrometre or sub-micrometre level. They consider that it is unfeasible to get nanometer-scale accuracy using grating-based sensors.

激光技术和光栅技术是毫米级以上量程的精密几何量测量的两种最主要手段，目前，用激光进行纳米测量的研究已经很多，但光栅纳米测量技术的研究却很少；很多人，包括很多光栅研究者和测量专家，都认为，光栅测量的精度不如激光，其精度还只是停留在微米量级上，用光栅来进行更高精度的测量以至纳米测量是难以实现的。

In order to verify the accuracy of the modeling built by ANSYS and the precision of the analytical results, the modelings of both rotor and motor are experimented at same time. After the comparisons of the numeric analysis results, experimental values are the foundation to consider the physical meanings and to suitably modify the modeling in order to decrease the differences between both results, to obtain the correct modeling type, to increase the analysis accuracy, and to provide designers a reliable basis.

为了证实本文中软体建模的精确度以及各项分析结果的准确性，以马达为例，在进行马达转子的模态分析时，一方面做马达模态测试实验，经由两者数值分析结果之比较，以实验值为基准，根据有限元素模型的物理意义，作适当的修改，减少分析及实验结果两者间的误差，以获得正确的建模型式，提高分析精确度，使提供给设计者为可靠的依据。

The main product has:Cold water machine of high accuracy,High accuracy mold temperature control machine,Control system of hot oil temperature,The machine side smashes to recover system,Divided by wet dry add the integral whole the machine,The concentration provides the cold or caloric system,The concentration provides the raw material system,The plastics mix withes the machine and Waste plastics recycring and reprocessing.

主要产品有：高精度冷水机，高精度模温机，热油温控系统，加料、粉碎、回收生产系统，除湿结晶干燥系统，集中供冷、供热系统，集中供料系统，塑料混合机等成型及回收专业生产设备。始终与用户保持紧密联系与合作，致力于领域内的深层探索和满足用户的实际需求。Sairs立足于不仅制造销售机器，而且提供最科学化，便捷化，合理化的技术。积极参于工程塑料时代生产技术的革新，与用户一起思考，共同分享成功的未来！

The theoretical analysis and experiments show that high overlay accuracy can be realized with the mark-based overlay method in SPM lithography, and the overlay accuracy can be quantitatively measured by the overlay metrology with verniers. The overlay method could be widely applied in the hybrid lithography with SPM.

理论分析与实验研究证明，在利用SPM的加工技术中，基于标记的场套刻对准方法能够实现高精度的套刻加工，通过游标检测法能够实现对于套刻对准精度的定量表征，本方法在利用SPM的混合加工技术中具有广阔的应用前景。

Because there are the characteristics of uncertainty and mixing meta-pixels in the remote-sensing images, the classical fuzzy c-means method has a low accuracy in the remote-sensing image clustering. This paper improves the fuzzy c-means method. And it adds a-priori information into the patterns to change the method as a semi-supervised clustering. In the clustering process, the unlabelled patterns compare similarities with the labeled patterns, and then the accuracy of the algorithm can be increased.(3)The paper proposes an interactive learning-based image mining in remote sensing.

由于遥感图像各类别在特征空间中散点图的分布的特点，本文对传统的FCM聚类算法进行改进，并且加入先验信息之后，将原来的非监督的聚类变成一种半监督的聚类方法，通过与已标签的样本进行相似性比较，能有效地提高聚类算法的准确度。

Methods:The MSCT datas of 65 mechanical intestinal obstructions confirmed by operation and pathology were collected and reconstructed with multiplanar reconstruction technique,including 43 cases underwent plain scan;the remaining 22 cases underwent plain and contrast-enhanced scan.Results: Contrast to operation and pathology,there were 25 adhesions,24 neoplasms,5 bowel torsions,5 bezoarhs,4 intussusceptions,2 Crohn's diseases in 65 mechanical intestinal obstructions,the diagnostic accuracy of MPR in mechanical intestinal obstruction was 100%,and the accuracy of the pathogeny was 84.6%.

以往在肠梗阻的诊断中应用最多的为腹部X线平片，但因其信息量不足，对大部分病人不能提出肯定诊断，且对梗阻的病因及病变肠管的血供都无法判断。16层螺旋CT在肠梗阻的诊断中具有明显优势，快速、薄层扫描可得到高质量的各向同性后处理重建图像，在显示肠壁、肠腔和周围结构等方面具有较大优势，有利于肠梗阻的梗阻部位及病因、并发症的诊断。

As a kind of precisely inertial instrument, the orientational accuracy of the north-seeking system is decided by the accuracy of the gyroscope it used to a large extent.

在本文中我们研究的这种磁悬浮陀螺寻北仪，就是通过采用自适应控制方法，利用磁悬浮技术实现对单自由度陀螺框架轴的无摩擦悬浮，旨在得到更高的寻北精度，同时提高定向速度。

And Finally according to theprogramed algorithms, simulation and experimental stitchings are porformed for testing thealgorithm accuracy. Results show that, the comprehensive errors of theretical andexperimental wavefront stitchings are less than 10~(-6)λand than PV/10 (where PV refering towavefront peak-to-vally value), respectively. Furthermore, experimental research isconducted on the influence of stitching accuracy by sub-aperture overlapping area andstitching modes, with subaperature real-time stitching test for large plano-optic broughtabout.

第三，对编写的算法程序进行了模拟拼接实验和实际拼接实验，测得该算法程序的精度为：理论拼接波面的综合误差小于10~(-6)λ，实际拼接波面的综合误差小于PV／10(PV为被测波面相位峰谷值)；在此基础上，又就子孔径重叠区域大小和拼接模式对拼接精度的影响进行了实验和分析，实现了大口径光学平面的子孔径实时拼接检测。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

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