查询词典 rectangular projection

On the basement of conventional direct fan-beam reconstruction, this paper gives a newly improved algorithm-"fast filtering-backprojection". This method utilizes the symmetrical circle geometry to sample projection data, and reconstructs image on the Polarcoordinate firstly, then translates this reconstructed image onto the cartesian coordinate system with two interpolating operations so that the computer can show the result image on the VGA screen. This algorithm rebates the calculating backprojection greatly, and shortens a few times of reconstructing time than same kinds of means. With the size of image enlarging, the reconstructing time abates with 2 exponent times. In addition, according to the idea of parallel-beam, we rearrange the fan-beams and reconstruct image using parallel-beam method fastly. The rearranging constraint condition is given here.

本文首先在传统的扇束直接重建方法的基础上，提出了一个改进的快速滤波反投影重建算法，它利用旋转采集投影数据的圆周对称的几何关系，先在极坐标系统内进行图象的重建，然后通过两次内插运算再将图象转换到计算机显示方式下的笛卡尔坐标系中去，该方法将以往的直接重建方法中的反投影时所需的运算大大降低，并将重建时间比同类方法缩短了几倍，而且随着重建图象的尺寸的增大，重建时间以2的指数次方倍相对缩短，并获得了较好质量的重建图象；另外，又根据平行束投影重建图象的思想，对扇形射束进行了重排，然后利用平行束重建图象的方法进行扇束的重建，并推导了&扇束重排重建图象&方法的约束条件。

In this paper, an approach to two problems in organic chemical teaching was made:(1) Determination of the type and the number of Cis-trans isomers of acyclic alkenes;(2)An easy way to convert a Fischer Projection into a zigzag representation.

对如下两个有机化学教学问题进行了探讨：(1)如何确定链状多烯顺反异构体的数目和类型；(2)单糖的Fischer投影式转变为透视式的简便方法。

Enterprise brief: with an total asset of RMB143 million yuan, it owns production lines of electric melting furnace, automatic glass envelope press, high-borosilicate glass pipe and high-illumination color back projection TV projecting cone.

该公司资产总额1.43亿元，拥有全电熔窑炉、自动玻壳压机、高硼硅玻管、玻壳封接和高亮度彩色背投电视投影锥生产线。

This example is shaped like a peacock, below which extends a cylindrical projection that opens into a small receptacle for oil or ghee, lit with a cotton wick.

这个例子是形似孔雀，低于延伸圆柱投影的黄油打开成一个小型的容器或澄清油酥油，用棉芯点燃。

A novel pattern was designed for the calibration of structured light vision. The calibration is realized with the Zhang camera calibration method and cross-ratio invariant ruler of projection conversion.

设计了一种新型平面靶标，基于Zhang摄像机标定法和投影变换中的交比不变性，进行结构光视觉传感器系统的标定。

The laser projection device makes cutting angle more accurant and more convenient.

二、该设备具有激光投影装置、可使角钢的切角角度更准确，使用更方便。

Blue and red forces begin conveniently separated, and the blue planners direct their considerable expertise and planning skills into the physics of force projection.

蓝方和红方的部队开始时阵垒分明，蓝方的参谋们将他们相当不错的专业知识和谋划技能发挥到部队的投放过程当中。

A second Ingo Dalton projection takes up most of one of the shorter walls in the space, adjacent to one of two corner clusters of four glass drop pendant lights of varied lengths, by Vistosi.

第二英戈道尔顿预测占用空间中的一个最短墙，毗邻的两个玻璃下降了4个不同长度的Vistosi吊灯，角落集群之一。

Modeling and stability analysis problem of linear switched system are emphasized in this part and main results include:(1) Through investigation in the projection of 〓 on x, where x denotes continuous state vector, a series of sufficient conditions for stability, asymptotic stability and unstability of linear switched system's equilibrium in the sense of Lyapunov are achieved. And also, a sufficient and necessary condition for state bounded stability of linear switched system is received.(2) For a class of periodical linear switched system whose switching sets are a group of ordinal lines starting from the original point, it's proved that state bounded stability can be defined by the running characteristic in a single period (3) Based on linear switched system, the concept of linear switched system network is put forward. Linear switched system network is a complex network interconnected by many linear switched systems.

这部分着重研究线性切换系统的建模与稳定性分析问题，主要成果包括：（1）通过考察〓在x上的投影，得到线性切换系统的平衡点在Lyapunov意义下稳定、渐近稳定及不稳定的一系列充分条件，并得到了线性切换系统状态有界稳定的一个充要条件；（2）证明了对于一类切换集为从原点出发的一组射线的周期线性切换系统，其状态有界稳定可根据一个周期内的系统运行特性来判定；（3）在线性切换系统的基础上提出了线性切换系统网络的概念，线性切换系统网络是由多个线性切换系统交互作用而形成的复杂网络。

ZEBASE includes samples of singlets, doublets, achromats, triplets, eyepieces, magnifiers, afocal systems, beam expanders, air spaced triplets, inverse telephotos, retrofocus, wide angles, telephotos, Petzval lenses, microscope objectives, double Gauss lenses, endoscopes, periscopes, riflescopes, mirror telescopes, scanning lenses, projection lenses, zoom lenses, and more.

ZEBASE包含简单的单透镜、双透镜、复消色差透镜、库克透镜、目镜、放大镜、和无焦系统、光束放大器、AIR SPACED的库克透镜、远心系统、广角镜头、Petzval透镜、显微镜物镜、双高斯镜头、内窥镜、展望镜头、机枪瞄准镜、发射式望远镜、扫描镜头、投影镜头、变焦镜头等等。

The production moved off-Broadway to New York City, where she won the Joseph E. Calloway award for her performance, and was profiled in American Theater Magazine as one of ten young theater artists to watch.

生产提出过百老汇的新的纽约市，在那里她赢得了约瑟夫calloway奖，她的表现，并于异型在美国的战区杂志之一， 10战区的青年艺术家观赏。

It's a risk tradeoff, and I believe that adding test support code usually wins.

这是一个风险的权衡，我相信添加测试代码通常会占上风。