查询词典 rhomb

So the theoretical basis is provided for optimizing achromatism of the rhomb-type retarder and the material selecting scope can be extended.

从而为优化菱体型相位延迟器的消色差性，扩大材料的选取范围提供理论指导。

Optimal design of rhomb-type retarder can improve achromatism according to the principle that the light arising total reflection has a phase transformation in the medium surface.

根据光在介质表面全反射时发生相变这一原理，分析了一个具有3个全内反射面的菱体型延迟器件，得出了相位延迟δ与全内反射角θ和相位延迟δ与介质折射率n的关系。

The basic form of this crystal is a rhomb .

此类晶体的基本形状为一菱面体。

Results:1、Three distinct bladder mucosa patterns were seen:normal mucosa and wall,but the urine was light-echogenic;the mucosa and wall thickened with enhanced echoes and irregular mucosa;local mucosa thickened in rhomb or flat figure.2、The bladder wall diffusively thickened or somewhere,three layers of the wall clear or obscure.3、Some echoes spots floating in the urine.

结果：1、膀胱粘膜图像可分为三类：A、粘膜未见确切异常回声，但尿液有漂移光点；B、粘膜弥漫性增厚，回声增强，粗糙不光滑呈细颗粒状、断续状表现；C、粘膜局灶性增厚呈棱形或扁平状；2、膀胱壁回声可正常，弥漫性增厚或局灶性增厚，三层结构可辨，基本可辨或分辨较差；3、尿液内出现不同程度的光点透声。

Two opposite corners of this rhomb contain three obtuse angles of 101°55'.

菱面体的两个对顶包含着三个101°55'的钝角。

Application of Fresnel rhomb in for the optic axis of a 1/4 wave plate .

菲涅尔菱体在确定1/4波片快慢轴中的应用。

So when the wavelength of the incident light changes, only the position of rhomb-type retarder need to be changed to allow the light to represent oblique incidence in the front of rhomb, and then selecting suitable incident angle can compensate the dispersion phase deviation, and make the same rhomb possess standard λ/4 phase retarder under all different wavelengths.

当入射光的波长改变时，只需改变菱体延迟器的方位，让光线在菱体的前端面上斜入射，适当选取入射角，就可以补偿相位延迟的色散偏差，使同一菱体达到对不同波长都满足λ/4相位延迟。

In order to meet the demand of precise measurement and applications, the principle of phase retardation with oblique incident angle is expounded, based on the total-reflection phase transformation theory of the phase retardation. By means of Fresnel rhomb, the variation law of the phase retardation for rhomb-type retarder with the incident angle is analyzed. The result indicates that incident angle has obvious influence over the phase retardation.The phase retardation is sensitive to the incident angle, and also has close correlation to incident position of the incident ray, which is asymmetrical to the incident position of the incident ray.

为满足精确应用和测量的需求，从相位延迟的全反射相变理论出发，阐述了斜入射相位延迟原理，以菲涅耳菱体为例，分析了菱体型相位延迟器相位延迟随其入射角变化的规律性，结果表明：当光线非严格准直时，光的入射角对相位延迟量有明显的影响，延迟量不但对入射角变化敏感，而且还与入射光线的入射方位密切相关，呈不对称形式。

Experiments show that rhomb partitioning is more powerful in suppressing block artifacts than square partitioning, results in much higher reconstructed image quality, but takes longer encoding time; 2 For solving exhausting encoding problem of fractal image coding, we present a fast rhomb-partitioning fractal image coding based on neighbor-searching; we present a fast rhomb-partitioning fractal image coding based on block classification; we present a fast square-partitioning fractal image coding based on neighbor-searching, block classification and wavelet transform.

2针对分形图象压缩编码过程非常耗时的致命弱点，提出了基于邻域搜索的菱形块分割的快速分形图象压缩编码方法，提出了基于块分类的菱形块分割的快速分形图象压缩编码方法，提出了基于邻域搜索·块分类和小波变换的方块分割的快速分形图象压缩编码方法，实验结果表明，我们提出的快速分形图象压缩编码与传统的分形图象压缩编码相比，编码速度提高了近40倍。

Part 1: On image compression coding 1 Based on human visual property, we present a rhomb-partitioning fractal image compression coding, discuss fractal image coding of fixed-size rhomb partitioning and adaptive rhomb partitioning.

第一部分是有关图象压缩编码的： 1基于人眼的视觉特性，提出了基于菱形分割的分形图象压缩编码方法，讨论了固定菱形块分割图象·自适应菱形块分割图象的分形图象压缩编码问题，实验结果表明菱形块分割图象比方块分割图象更有效地抑制"块效应"，重建图象质量明显提高，但编码时间较长。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。