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shaped beams
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  “shaped beams”译为未确定词的双语例句
     The Study of Theory on Shaped Beams for Satellite Antennas
     卫星多波束天线赋形理论的研究
短句来源
     Genetic Algorithms Applied to the Shaped Beams in the Multi Beams Antennas
     遗传算法在多波束赋形天线优化中的研究
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     The calculation of the springback of strips and shaped beams after their elastic-plastic bending has been solved completely.
     全面地解决了板条和型材弹塑性弯曲后的回弹计算问题.
短句来源
     By calculating the L shaped beams which are greatly used in motorcycle's frame structures, it can be found that differences in the weld quality of beams result in different boundary conditions, thus affecting such factors of vibration beams as incident power, reflect power and transfer power as well as reflect coefficient and transfer coefficient.
     采用功率流方法探讨摩托车架的焊接质量 通过摩托车架上大量使用的L型杆件的模拟计算可以发现 :杆件的焊接质量不同 ,杆件振动的边界条件就不同 ,从而影响振动杆件的入射功率流、反射功率流和传递功率流以及反射系数和传递系数 ;
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     Four parameters indicating the performance of shaped beams are first defined.
     首先提出4个能够描述赋形波束性能好坏的性能指标。
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  相似匹配句对
     The design and calculation of welding I-shaped crane beams
     焊接工字形吊车梁的设计与计算
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     The Study of Theory on Shaped Beams for Satellite Antennas
     卫星多波束天线赋形理论的研究
短句来源
     SHAPED PULSES AND ITS APPLICATIONS
     高分辨NMR中的整形脉冲技术及其应用
短句来源
     Progress in Hollow Beams
     空心光束的研究进展
短句来源
     ON THE VASE-SHAPED MICROFOSSILS
     瓶状微化石研究中几个问题的讨论
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  shaped beams
In particular, a panorama is presented of the experiments with evanescent waves and/or tunnelling photons, and with the "localized Superluminal solutions" to the Maxwell equations (like the so-called X-shaped beams).
      
This problem is considered for beams much smaller than the decay length of the unstable particle, much larger than the decay length and finally also for pancake- shaped beams.
      
The first suggestion was I shaped beams should be used to provide insulation space.
      
The distributions consist mainly of an earthward and tailward directed crescent-shaped beams.
      
The I-shaped beams and columns were formed with galvanized light-gauge, cold-formed steel.
      
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A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam...

A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

本论文讨论如何利用简单衍射理论,计算改良抛物面反射器天线幅射之图型。此反射器可将一无方向性辐射源之能量聚集于任何形状之波束中。此原理可以应用在地面上或船面上寻求飞机高度雷达天线之设计。在此类雷达中,天线之方位图型必须为“双馀割平方”式;其特性为自波束对称轴线起,至其两端,辐射一次路程之功率,与方位角之馀割平方成正比。得此图型之最简易方法为置一狭窄之铅垂金属条于一截形抛物面反射器之中心,金属条之宽度,可改变波束之方向性;其支距,即金属条与反射器之距离,可影响两反射波之位相。故改变金属条之宽度及其支距,可得欲得之图型。 利用衍射及干涉理论,计算金属条及截形抛物面所生之总图型为:在方位面内,幅射强度J_H与水平角θ之关系为: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A为辐射波振幅,A为A之复共轭数。计算之结果与实验之结果,颇为一致。

By reviewing author's study on doubly curved shaped beam reflector antennatheory,it is suggested that by utilizing common elliptic shaped strips reflectors can be constructed, thus generalizing synthetic theory. Formulae have been derived for principal and cross polarization components in far field as well as for antenna in the far field with offset feed or off-axis feed. In particular, formulae for far field patterns in the main radiating region have been given.

本文综述了赋形波束双弯曲反射器天线理论之研究。主要内容是:反射器的分类问题;提出了可采用一般的椭圆型条带(称为斜条带)来组成反射器,而水平带和焦点带只是它的特殊情形,使得综合理论更一般化;给出了此类天线远区场的主极化分量和交叉极化分量的计算公式,以及馈源斜置时和馈源偏离轴线时天线的远区场计算公式,尤其是还推导了在主辐射区内天线远区场的渐近公式。

On the basis of studying the cementing power of plywood structure, exp- loratory experiment were made on the reliability of cemented structural mem- bers.This paper, gives the experimental summation on strength and rigidity oe I-shaped beam with slab of cemented flank of massion pine. The results of thf experiments show that with the structural members using massion pine wood ce- mented with urea-formaldehyde resin or phenolphthalein resin, the safety fac- tor of bending stress is greater than 3, the safety...

On the basis of studying the cementing power of plywood structure, exp- loratory experiment were made on the reliability of cemented structural mem- bers.This paper, gives the experimental summation on strength and rigidity oe I-shaped beam with slab of cemented flank of massion pine. The results of thf experiments show that with the structural members using massion pine wood ce- mented with urea-formaldehyde resin or phenolphthalein resin, the safety fac- tor of bending stress is greater than 3, the safety factor of shearing stress is greater than 5,and the strength of cemented crack is greater than the strength of wood. This provides a basis for comprehensive treatment of the defects of massion pine wood and widens theuse of cemented wood structure.

我们在胶合木结构胶结能力研究的基础上,对胶合构件的可靠性进行探讨性试验,本文为马尾松胶合侧立腹板工字形梁的强度、刚度的试验总结.试验结果表明,用尿醛树脂或酚醛树脂胶合马尾松木材的构件、弯曲应力的安全度大于3,剪应力安全度大于5,胶缝强度大于木材强度,为综合治理马尾松木材的缺陷和扩大胶合木结构的应用提供依据.

 
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