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height
相关语句
  相似匹配句对
     Eternal Height
     永恒的高度
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     True Height
     跨越真正的高度
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     (2) the height is free.
     (2)高度自由。
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     (3)the height of chimneys>55m.
     (3)烟囱高度>55m。
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  height
A very large sample plug was introduced hydrostatically into the capillary (65 cm × 50 μm i.d.; effective length of 35 cm) over 80 s at a height difference of 11 cm.
      
The unbound ketoprofen concentration was directly measured from the height of the frontal peak.
      
The melt droplets with a height of 50-100 nm and a lateral size of 2-3 μm were obtained by melting the PEO ultra-thin films on a mica surface.
      
The results of measurement show that this lidar has the ability to gain profiles of ratio of water vapor mixing ratio from surface to a height of about 8 km at night.
      
Results showed that arbuscular mycorrhizal (AM) inoculation significantly improved the height, stem diameter, and fresh weight of P.
      
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This paper gives a preliminary report on ionospheric layers over China, reporting a 24-hour measurement of the virtual heights on a summer day in Shanghai, which reveals all the salient features of the lower (E) and upper (F) layers.

此篇系研究中国天空电离层之初草报告,内述夏日在上海连续二十四小时测量各层视高之结果,显出上下两层各种重要现象。

Routine hourly observations of ionospheric characteristics have been taken at Wuchang since August 20. 1946. In this paper a general analysis of the data obtained from September 1946 through December 1947 is attempted. The diurnal and seasonal variations of ionization density and virtual height for all regular layers (E, F-l, F-2) are plotted in diagrams and briefly explained. Deviations from the normally recognized characteristics are discussed in more detail.

本文叙述三十五年九月至三十六年十二月在武昌观测游离层之工作结果,且加以分析、对於E,F_1,F_2各层之游离强度及其视高之日变及季变,均绘图表明,并将偶有与一般公认情形不符者特别指出。末又讨论异常E层之变化,及其与流星之关系。

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...

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。

 
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