查询词典 beam-focusing

The influence of the beam voltage and magnet field on electron beam performance was studied.

并对电子注在不同工作电压和磁场下的质量进行了分析计算。

At the same time, the cooperation of the multi-layer frame structure is researched with FEA when the pre-stressed threads are stretching, and the relationship between the beam of stretching layer and the beams of nearly layers is discussed. The layout effect of regular reinforcement in the beam on the pre-stressed effective quantities is also analyzed, and the elementary estimation formula of pre-stressing loss on the multi-layer frame is also deduced according to the pre-stressing loss of one-layer pre-stressed frame structure.

同时文中还运用有限元对多层框架结构在预应力张拉过程中，某层梁预应力的张拉与相邻层梁的影响关系和结构各构件的整体协同工作做了研究，分析了非预应力筋在梁中的配置对框架梁预应力有效量的影响；并且在一层框架梁侧限预应力损失的基础上，扩展了多层框架结构中侧向约束引起梁的预应力损失值的初步设计估算公式。

To control the film growth,severalmethods based on energetic particle(atom and/or ion)depositions,e.g.,ion beam assisteddeposition,sputter deposition,accelerated molecular beam epitaxy,and energy-filtered ionbeam deposition,etc.,were developed in the past few years.

载能粒子沉积是以离子束技术和常规薄膜制备技术为基础而发展起来的一类具有广泛应用前景的薄膜制备方法，但受研究手段的限制，人们对载能粒子沉积的薄膜生长机制一直缺乏比较全面、系统的了解。

However the available direction estimation region is only within the 3dB beam width of subarrays,in order to estimate at any interested direction one can combine this method with beam scanning.

但其有效的方向估计范围只在子阵的3dB波束宽度内，然而与波束扫描相结合可实现任意空间范围内的方向估计。

The beam emittance and brightness are the important figure of merit for the beam in accelerator.

束流发射度和束流亮度是表征加速器束流品质的主要指标。

In chapter 3, on basis of the first order shear deformation theory, a series of composite laminated beam elements are developed, which are plied transversely, longitudinally and/or assembled both, respectively. A geometric nonlinear element stiffness matrix for the transversely plied laminated beam is presented.

第三章首先介绍了目前已有的在小变形下的横向层合梁、纵向层合梁和组合层合梁理论，并推导了其相应的有限元列式，然后又基于Von-Karman大挠度理论的几何关系，推导了大变形下横向层合梁的单元切线刚度阵。

In order to acquire the spatial stress distribution of the pier-beam fixed joint , a pier-beam fixed joint finite element space model is established and analyzed in different loading cases.

为掌握石板坡大桥墩梁固结点的三维应力状态，建立了墩梁固结点结构分析的空间有限元模型，根据施工过程中及成桥后的工况，分别进行了空间有限元计算，得到了墩梁固结点在三种工况下的应力分布情况，检验了设计的安全性与合理性，提出了改善墩梁固结点应力的措施和方法，为设计和施工提供了科学的依据。

It is shown that in the small distance region of the bar-LD the intensity distribution of the bar-LD is constructed by separate beam spots emitted from each emitter. As the distance of the observation point from the bar-LD increases, the beam spots of the emitters begin to overlap, and even to form a flattop distribution in a large distance region.

结果表明，在距发光面较近处，各emitter辐射的光斑呈分离状；随着距离增加，各光斑开始交叠，甚至出现平顶；当距离足够远，bar型半导体激光器的远场光斑与单个emitter的辐射光斑几乎没有差异。

The assembly method of the invention has the main principles that a semiconductor laser, an optical coupled apparatus and a fiber head are orderly arranged, and the optical axes of the semiconductor laser, the optical coupled apparatus and the fiber head are arranged in a same straight line; the focal plane of an output beam which is focused on the fiber head is changed through utilizing and adjusting an adjusting device which can cause a beam to deviate; the sensitivity of the assembly adjustment of the adjusting device in the course of fixing is reduced.

本发明的方法的主要原理是将半导体激光器、光学耦合器件、光纤头依次排列，并使它们光轴在同一直线上，然后通过利用一使光束发生偏移的调节器件，通过调节该调节改变聚焦于光纤头的输出光束的焦平面，降低调节器件装配调节的固定时的敏感性。

The radius of the focal point will gradually rise and the amplitude of the beam wave will reduce as the beam transmits in the channel.

选择适当的系统参数，可调节束聚焦点位置和聚焦点半径的大小，实现电子束的长距传输并且减少电子束的耗散。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。