三维

The regurgitant volume was calculated by temporally integrating the instantaneous flow volume rate of each frame during systole.

建立了基于经食道旋转扫描二维和经胸实时三维超声多普勒血流图像获取方法和图像插值、配准算法获得体数据，经多维重建描述二尖瓣反流速度的空间分布，立体观察返流的时相、方向、反流束长度、面积、体积、空间传播和严重程度等；通过重建反流后的速度场，从血流动力学角度分析了二尖瓣反流的性质，计算偏心反流束的湍流强度，利用反流束角度和湍流强度对计算结果进行修正；基于实时三维彩色多普勒成像技术，利用控制体原理对二尖瓣反流束在反流瓣口横断面的速度分布进行空间与时间积分获得二尖瓣偏心性反流的每搏反流量。

Mandibular teeth and sustentacular tissues extracted from a healthy adult were treated using CT scanning to obtain two-dimensional image, and then a three-dimensional image was established using computer reconstruction technique. Simultaneously, a three-dimensional finite element model of rigid fixed bridge was established in abutments with mandibular 56 deletion.

采用CT扫描获取健康成人下颌牙及其支持组织的二维图像，通过计算机重建技术建立三维立体图像并获得了下颌56缺失后的双端单基牙固定桥的三维有限元数学模型。

3D model holds more rich information thatn 2D image, so implementing face recognition on 3D face model is one of the effective approaches to tackle the present problems.

三维人脸模型具有比二维人脸图像更丰富的信息，利用三维信息是完成人脸识别的另一有效途径。

Conclusions］Complex acetabular fractures with displacement should be evaluated by means of 2D rconstruction and three-dimensional multislice spiral CT.However 3D CT is of little practical value in undisplaced acetabular fractures.

结论］对于有移位的髋臼骨折尤其是复杂的骨折，应尽可能行二维及三维CT重建协助完善术前准备，三维CT对无移位的髋臼骨折实用价值不大。

The nonlinear characteristic of 2-D PSD is checked in a long collimating distance of 78 meters.

利用多层前馈神经网络建立了入射光实际位置与二维PSD输出坐标以及准直距离间的空间三维映射关系，进而对PSD的空间三维非线性进行修正。

But now this area of exploration has been revolutionized with the development of 3-dimensional scans, and even more remarkably, 3D scans which move in real time, known as 4D scans.

但是随着三维技术的发展，甚至出现了更先进的实时三维技术或者称为四维技术，胎儿的研究有了全新的发展。

The floating model is defined with a datum point indicates the model's position. Each kind of models is associated with a set of pose parameters to describe its rotation about the three orthogonal axes and shape parameters to describe its scales along predefined directions.

零维的浮测标拓展到三维的浮测模型，除了具备可调整的三维位置参数外，还依模型种类增加了各方向的伸缩尺度、空间旋转等参数，可想像成一个漂浮在空间中，可移动、旋转、缩放大小以量测地物的模型。

Compared to the flat culture, cells in 3-D culture more closely mirror what happens in living organisms in morphology, cell alinements, polarization, microenviroments, gene expression pattern and other biological characters. Therefore,3-D culture is useful to investigate the molecular mechanism of nasopharyngeal carcinogenesis.

因与传统的二维培养相比，细胞在三维培养中的形态、排列方式、极性及微环境更接近于体内状态，其基因表达和生物学行为也更接近于体内状态，因而建立能反映鼻咽癌发病不同时期的体外三维培养模型对于鼻咽癌的发病机制研究具有重要价值。

basing on optics orthogonal codes,this paper proposes a new design scheme of three-dimension optics orthogonal codes.in this scheme,the optics orthogonal codes can be coded not only in space-domain,in time-domain,but also in frequency-domain.it has good auto-cross relativity properties.the simulation figures show that can enlarge the coeds capacity and improve the optics optical communications system performance.so it will be of interesting in coming high dense communication system.

摘 要：基于光正交码编码技术，提出了一种新型空/时/频三维ooc的设计方案，对光信号在时、频和空域进行编码，该码具有理想的自/互相关特性。通过仿真比较，在容量和系统的误码率等性能方面比一、二维ooc都有较大的提高，因而能很好地适应未来高密集光纤通信。关键词：三维光正交码；光码分多址；误码率；高密集光纤通信

Filter factor with high computation efficiency can be obtained through resolving the difference equation without reducing the number of dimension in solving the 3D partial differential equation.

在求解三维滤波方程时不对三维微分方程进行降维处理，仅对差分方程进行分解，从而获得计算效率很高的滤波因子。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。