查询词典 four dimensional

According to the theory of beam phase space , the projective density distributions in four dimensional and two dimensional trace space are derived for some space charge distributions often used in accelerator physics. And, the relation between beam emittance and brightness with density distributions is developed too.

针对加速器中几种常用的束流密度相空间分布形式，根据束流相空间理论，推得了它们在四维和二维径迹空间中的投影密度，并给出了束流发射度和亮度与束流密度分布的关系式，为加速器束流测量和束流诊断提供理论依据。

A deadlock free plane self-adapting routing method in a two-dimensional torus network belongs to the distributing high performance fault tolerance computing technology field, characterized in that each physical passage between nodes are divided into two virtual passages which are both two-way passages and distributed to four virtual sub network of the two-dimensional torus network; the virtual passage distribution strategy avoids the deadlock formed among the sub networks and between the sub networks and has greater self-adapting.

二维torus网络无死锁的自适应路由方法属于分布式高性能容错计算技术领域，其特征在于，把节点之间的每条物理通道被划分为两条虚拟通道，这两条通道均为两向通道，并分配到二维torus网络的四个虚拟子网中，利用虚拟通道分配策略避免了各子网内以及各子网间可能形成的死锁，同时达到更高的自适应性。

In this study we combined two-dimensional, Doppler, three- and four-dimensional echocardiography, Transesophageal echocardiography , and the new technique-acoustic quantification with radionuclide ventriculography and right heart catheter examinations a...

本研究利用经胸二维超声、多普勒超声、三维及四维超声、声学定量技术和经食管超声等多种超声技术，与核素心室造影、结合较为系统地对右心功能进行了研究。

Replacing DETA with PIP, a new three dimensional compound 3 issynthesized and the 3D anionic framework of compound 3 is constructed from twodistinct motifs, a one-dimensional tancoite chain and a single 4-ring (S4R) unit,which contains four intersecting channels running throughout the structure as 8,12-member ring channels along to the a axis and 12-member ring channels along theb and c axis, respectively.

其中，以乙二胺为模板剂的亚磷酸铟微孔化合物具有无限的共边4员环一维链状结构；以哌嗪和1，6-己二胺为模板剂合成出的亚磷酸铟化合物分别具有二维交叉8员环孔道和16员环孔道的三维开放骨架结构。

In this paper,the updated Snake model is used to solve the echocardiography processing.Based on the updated active contour model,the contour points for two-dimensional slice serial of echocardiography are gotten.On this basis,through calculating the distance between the contour points of each two-dimensional slice and the center axis lines,the distance matrix from the four cambers of the ventricle to the center plane of ventricle are gotten.And through interpolating,smooth handling and filtering,the 3D endoscopic surface of ventricle is fitted out.Besides,in the medical measurements field,the slice area of ventricle and the volume of ventricle are measured,and the trend of slice area is also analyzed.

将改进的Snake模型应用于心脏超声波图像处理：基于改进Snake模型的思想，得到了心脏超声波图像二维切片序列的轮廓点，在此基础上，得到分割出的心室上下左右4个曲面上轮廓点到中心平面的距离矩阵，并通过插值和平滑处理以及滤波处理工作，拟合出心室的三维曲面图，取得了较好的效果；在医学测量方面，对心室的切片面积、变化趋势及心室的体积进行了测量。

On this basis, using the same theories and methods, we set up the three-dimensional steady-state models of ideal well productivity about a reverse double-branch horizontal wells, the three branches of radial horizontal wells, fish-bone shape three branches horizontal wells and two-dimensional four branches horizontal wells In five reservoirs respectively.

在此基础之上，运用同样的理论和方法，建立了反向双分支水平井、辐射状三分支水平井、鱼骨形三分支水平井和二维四分支水平井这四种分支水平井分别在以上五种油藏中的三维稳态理想井产能模型。

The culture can be described in the four-dimensional or three-dimensional degree.

尽管对文化的度量存在一定的困难，但还是可以通过四维度或三维度法进行描述。

But you can conceptualize a four-dimensional data structure by thinking of the fourth dimension as multiple three-dimensional cubes.

但是您可以采用将一个四维数据结构看作是多个三维立方体的方式来理解四维数据结构。

Results: The accuracy of four-dimensional ultrasound was 100%,while that of two-dimensional ultrasound was 85.7% between 14 to 24 weeks of gestation.

但传统的二维超声存在一定的局限性，本研究采用通过比较二维和实时三维超声

Exhibition hall is divided into four, nine galleries, one of electric and magnetic layer for the area, power and machinery area, math section, the universe and Space Pavilion, set up a high-voltage discharge, electric magnetic Gallery, bowls, a typical mechanical transmission, three-dimensional coordinates and other exhibits; the second floor for the sound and light booth, Applied Technology Pavilion, set up a light display, three-dimensional holographic images, sound simulation, laser laser, simulated driving and other exhibits; three for the Life and Health Pavilion, set up a false impression cylinder, fitness tests, brain and facial features, body systems, such as exhibits; underground floor for temporary exhibitions; in the Office of the Hebei Academy of Sciences set up a pavilion style.

展厅共分四层，九个展区，其中一层为电与磁展区、力与机械展区、数学展区、宇宙与航天展区，设置了高压放电、磁电廊、滚球、典型机械传动、三维坐标等展品；二层为声与光展区、应用技术展区，设置了光路展示、全息立体影像、声音模拟、激光内雕、模拟驾驶等展品；三层为生命与健康展区，设置了错觉滚筒、体能测试、大脑与五官、身体各系统等展品；地下一层为临时展览；中厅设置了河北院士风采展区。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。