这些结构是由一束束双螺旋DNA链构成。
The structures are made from bundles of double-helix DNA strands.
从螺旋锥束数据来重建图像有许多优点，但是这种成像方式在数学上比较复杂，技术实现也有相当的难度。
Image reconstruction from spiral cone-beam data is practically advantageous, but it is mathematically complicated and technically challenging.
但一束光线也可以由与其它不同步的光波组成，这样波峰的排列就形成了螺旋状。
But a beam can also be made of waves that are out of sync with one another, in just such a way that the arrangement of the peaks is a spiral.
随着多层螺旋ct的出现，医用CT正在向着螺旋锥束ct转变。
With the development of spiral multi-slice CT, medical CT is in transition towards spiral cone-beam CT.
本文给出作螺旋线运动的电子束在其轴线上的自生电场与磁场的解析表达式。
In this paper are presented the formulas for the self electric and magnetic fields on the axis of a helical electron beam.
以嵌入方式置于两个带束帘布层(23、25)之间的是一对基本上完全盘旋螺旋缠绕的覆盖层(24)。
Disposed between in embedded fashion between two of the belt plies (23, 25) is a pair of substantially full spiral helically wound overlays (24).
该谐振腔由一螺旋面反射镜和一球面反射镜构成，可充分提取激活区的能量并输出单束激光。
This resonator is composed of a helical reflecting mirror and a spherical reflecting mirror. The single laser beam can be effectively extracted.
基于现有的锥形束普适轨道的重构公式，研究了非螺旋轨道的探测器效率问题。
Using the present cone beam reconstruction formula for general trajectory, we have investigated the issue of detector efficiency for non-helical trajectory.
分析了电子束有限截面以及各电子的螺旋轨道不共轴对这二个自生场的影响。本文的结果有助于弄清螺旋电子束与其他电子束相互作用时的平衡态情况。
And are analysed the influence on the two self-fields resulting from the finite cross-section of the beam and that resulting from the fact that the axes of the individual electrons don't coincide.
分析了电子束有限截面以及各电子的螺旋轨道不共轴对这二个自生场的影响。本文的结果有助于弄清螺旋电子束与其他电子束相互作用时的平衡态情况。
And are analysed the influence on the two self-fields resulting from the finite cross-section of the beam and that resulting from the fact that the axes of the individual electrons don't coincide.
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