旋转中心

This technique uses a spiral phase plate with a small central aperture placed on the Fourier plane of so imaging system. If the spiral phase filter is rotated by a certain angle around its central axis, a phase shift between the zero-order spatial frequency component and the remaining of the object is produced, and the magnitude of this phase shift is proportional to the rotation angle. Using this property, we can record a sequence of intensity distribution of the output beams corresponding to different rotation angles, and then digitally reconstruct the objects by using a phase-shifting algorithm. Both the theoretical analysis and simulation experiment results demonstrate the feasibility of this approach.

在成像系统的频谱面上放置中心带有一通光孔径的螺旋相位板，在输出面上记录输入物体经螺旋相位滤波后的输出像；将螺旋相位滤波器绕轴旋转一定角度，通过中心光孔的零频成份与其他高频成份间会产生与旋转角度成正比的相移；利用这一特点，通过记录多幅对应不同旋转角度的输出光场强度分布图，然后再用一定的相移算法实现被记录物体相位分布的数字再现。

This technique uses a spiral phase plate with a small central aperture placed on the Fourier plane of an imaging system. If the spiral phase filter is rotated by a certain angle around its central axis,a phase shift between the zero-order spatial frequency component and the remaining of the object is produced,and the magnitude of this phase Shift is proportional to the rotation angle. Using this property,we can record a sequence of intensity distribution of the output beams corresponding to different rotation angles,and then digitally reconstruct the objects by using a phase-shifting algorithm. Both the theoretical analysis and simulation experiment results demonstrate the feasibility of this approach.

在成像系统的频谱面上放置中心带有一通光孔径的螺旋相位板，在输出面上记录输入物体经螺旋相位滤波后的输出像；将螺旋相位滤波器绕轴旋转一定角度，通过中心光孔的零频成份与其他高频成份间会产生与旋转角度成正比的相移；利用这一特点，通过记录多幅对应不同旋转角度的输出光场强度分布图，然后再用一定的相移算法实现被记录物体相位分布的数字再现。

Because the workpiece is in dynamic balance, the resultant moment acting on it should be zero. Introducing the moment from lapping tool and press head a moving differential equation is built. In this equation only workpiece rotating speed is unknown. It means that workpiece rotating speed can be got by this equation. Since there is a transcendental function in integral function of the equation an analytic result can not be got, only digital result can be got by a computer. Thus a change rule of workpiece rotating speed with lapping parameters is known, e.g. the radius of press disc ball socket, radius of press head ball, the distance between the workpiece rotating axis and lapping tool rotating axis, workpiece radius, modulus of elasticity of the press head and press disc, friction coefficients between the lapping tool and workpiece, and between the head and disc, pressure between the lapping tool and workpiece and pressure between the press head and press disc.

因工件处于动态平衡状态，其上所受到的来自于磨具和压头的力矩应相等，将二力矩表达式联立，建立工件运动微分方程，该方程中只有工件的旋转角速度是未知量，因此可以求出工件旋转角速度，但该方程积分式中含有超越函数，得不出解析解，只能通过计算机求出数值解，得出工件旋转角速度随各研磨参数的变化规律，如压盖球座半径、压头的球头半径、工件回转中心相对磨具回转中心的偏心距、工件半径、压头和压盖材料的弹性模量、磨具与工件间的摩擦系数、压头压盖间的摩擦系数、磨具与工件间的压强、压头压盖间的压力等。

In this system, tubular scaffold can rotate slowly around own major axis. By means of this, three-dimension tissuesor organs can be cultured in vitro. Part IIIHVEC, VSMC and fibroblast were seeded onto inner surface of tubular porous PGA and PHB scaffold precoated with collagen. Sead HVEC,VSMC and fibroblast onto three porous polyglycolic acid and Poly-?

我们还特别设计了旋转培养装置，通过微型马达驱动，减速装置作用使旋转部分绕自身中心水平轴做缓慢转动，从而使置于旋转部件上的管形支架绕其正中长轴作缓慢旋转，其原理与美国 Genzrpe公司的 RCCS（Rotary cell culture system RCCS）系统相仿。

At a total cost of $220 million, the turning torso is the tallest building in scandinavia and 1uber-architect calatrava's first skyscraper.

这次我们介绍的&旋转中心&正是人类用自己的聪明和美感，在天空划下的一道亮丽景致。

With the centrifugal force feeding the moten metal through ingates into casting, the directional solidification is obtained from the outside of the casting toward the downgate at the centre of rotation.

金属液在离心力作用下通过内浇口对铸件进行补缩，形成了从铸件外缘到旋转中心直浇口处的顺序凝固。

Result The coincident rate and the incoincident rate were 63.23%(group A, 98 hips) and 36.77%(group B, 57 hips) respectively. For loose, dislocation or low back pain, the rate of revision in group A and group B were 6.12% and 29.82% respectively.

结果］旋转中心恢复者98髋(63.23%)，未恢复者57髋(36.77%)；A、B两组中因人工髋关节松动、脱位、髋部痛等行髋关节假体翻修术分别为6髋(6.12%)、17髋(29.82%)。

ResultThe coincident rate and the incoincident rate were 63.23%(group A,98 hips) and 36.77%(group B,57 hips) resp...

结果旋转中心恢复者98髋(63.23%)，未恢复者57髋(36.77%)；A、B两组中因人工髋关节松动、脱位、髋部痛等行髋关节假体翻修术分别为6髋(6.12%)、17髋(29.82%)。

Upper and lower incisor both had controlled tipping movement. The crown of incisor moved mesially and had root apex were fixed relatively. The center of rotation was close to root apex. The upper and lower molar moved differently.

结果：唇挡治疗后，SNA、SNB分别增加1.02°和0.97°(P.05)，上下切牙前移均是牙冠向近中倾斜，而根尖相对固定的控制性倾斜，旋转中心接近根尖。

The theorem of multi view data cloud merging is discussed and the method for calibrating the turntables rotation center is anal...

文章阐述了多视角数据融合原理，论述了标定工作台旋转中心的方法。最后给出了数据融合及测量的实例

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。