查询词典 beam on

The research of beam instability on ring can be conducted according to the change of the cross section of beam profile and the movement of beam profile position obtained from beam profile monitoring system.

从束流截面大小的变化和束斑位置的移动规律，可以进行环上的束流不稳定性的研究。

To make picture clear, the electron beam that must come out to be being hit from electron gun undertakes focusing is handled, let electron beam pass electron lens, be opposite with optical lens of beam of light collect action likeness, the electron beam assemble that opens scattering rises, get on fluorescent screen one shines again small spot, add the effect of scanning circuit, ability shows clear picture.

为了使图像清楚，必须对从电子枪打出来的电子束进行聚焦处理，让电子束通过电子透镜，和光学透镜对光束的聚集功能相似，把散射开的电子束会聚起来，在荧光屏上得到一个又亮又小的光点，加上扫描电路的功能，才能显示清楚的图像。

There is no any additional phase modulation on the shaped beam when a LCOS is used as the beam shaper. A Garssian beam has successfully been converted to a square flattop super-Gaussian beam by use of a LCOS. The results show that the LCOS of...

研究发现，与透射式液晶光阀相比，反射式液晶光阀有着明显的优势，效率达到42%，远远优于透射式液晶光阀10%的效率，从而能够实现系统的大幅度简化，是一种非常有潜力的空间光调制器件。

In order to accurately analyze the differences on load carrying ability among laminated beam , laminated beam with wedges and beam as a whole of the same dimension,this paper sets up a model of flection of laminated beam s with rectangular cross section by taking advantage of Winkle s foundation assumption method and electric testing technique.

为了精确分析叠梁、加楔块叠梁和整梁的承载能力，采用温克尔假设法和电测实验技术，完成了矩形截面叠梁受力弯曲时的模型简化理论计算与实测分析。

The results show that due to the effect of laser beam quality on focal beam waist radius,focal angle and focal length,laser beam quality decides the beam focusing ability and the processing capacity of laser system.

结果表明，光束质量对聚焦光束的焦斑、聚焦角和焦深的影响不仅体现了激光源的可聚焦性，而且也标志了激光源的可加工能力，这是聚焦系统和焦点位置在选择过程中应该考虑的重要因素。

Chapter 2、When treat propagate problem of high power laser beams, ordinary assume beam to be ideal plane wave or Gaussian. Actually, beams is not ideal Gaussian or plane wave. The reason is that is phase aberraed and intensity nonuniform. In this chapter, we have developed a method on frequency conversion of aberrated beam. Based on statistical optics method and within the limits of thin crystal, we have studies on second harmonic generation of the phase aberrted beam. And the phase aberration is assumed to be a Gaussian random variable.

第二部分：在处理高功率光束传输问题中，通常假设光束为理想平面波或高斯型，而实际光束都不可能是理想的高斯光束或平面波，均会有一定的位相畸变及光强不均匀，本部分从统计光学的观点出发，在薄晶体近似下，建立了具有高斯型随机相位畸变光束倍频转换的一种统计描述方法，并对倍频转换光束的横向空间特性进行了分析。

Simulative results show that the electron beam can be transported in the unmagnetized plasma-filled for two reasons. The first, the plasma neutralizes the majority of the space charge forces within the beam. The second, radial electric field generated by electron beam interaction with the plasma leads the beam to converge along axis. By PIC simulation, we find that atomic mass of the background ion effects on the Characteristics of the plasma-filled devices.

非磁化等离子体填充的RBWO-FEL的模拟表明只有在一较窄的背景等离子体密度范围内，电子注才能良好传输，产生泵波及激光功率输出，并都存在有峰值功率点，同实验观测到的结果完全吻合；该范围内，电子注的传输是由于背景离子中和了注中径向发散空间电荷力及注在等离子体中产生的径向的电场使注在轴向汇聚。

For the frame foundation beam with prestressed anchor cable on the linearly elastic Winkler foundation model, elastic two-constant foundation model and isotropic elastic half-space foundation model, the thesis puts up the finite element computation model which can consider the harmonious deformation of the beam and foundation and the influences between the prestressed anchor cables. The limit design idea of the cable foundation beam has been brought out, which can ensure the safety of the beam with the limit capability of the anchor cable. The computing procedure has been given and programmed.

给出了包括线弹性Winkler地基模型、双参数线弹性地基模型以及各向同性弹性半空间体地基模型上预应力锚索地梁有限元力学计算模型，该模型能同时考虑地梁与岩土体的协调变形，各锚索预应力之间的相互影响，并据此编制了计算程序；考虑到锚索地梁的工作特点，提出了锚索地梁的极限状态设计思想，在充分发挥锚索承载力的同时保证了地梁的安全，给出了其具体计算过程和有限元程序。

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, the author first set force the conception, structural style, characteristic and development survey and so on of the beam transfer floor structure, and focus on the analyse of stress characteristic of prestressed concrete transfer beam structure at large, and recommend the design of major project briefly, then carry on the research of the construction technology of large span prestressed concrete transfer beam structure home.

本文首先简要阐述了梁式转换层的概念、结构形式、特点及发展概况等内容，重点对预应力混凝土转换梁结构的受力特点作了较为详尽的分析，并对其重点项目的设计做了简要的介绍，然后对大跨度预应力混凝土转换梁结构的施工技术进行了深入的研究。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。