directional是什么意思 directional在线翻译 directional什么意思 directional的意思 directional的翻译 directional的解释 directional的发音

1. directional

1. 指向性：若按其方向可大略区分为全向性(Omni-directional)天线和指向性(directional)天线. 全向性天线的名称说明了电磁场的辐射能量在每个方位都会一致,目前最普遍的全向性天线当属偶极(dipole)天线,绝大部分的基地台(Access Point),

2. directional

2. 定向：中国哈尔滨工业大学的物理学家透过电脑模拟,展示一种简单的级联(cascade)光子晶体结构设计,该结构具有自准直(self-collimating)的特性,能将约80%的输入能量转换成定向(directional)放射的光束,因此能有效地把光耦合到光纤、脊形波导

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3. <平行光>：光照效果的样式Light type: 平行光(Directional):以一条直线的形式,利用鼠标按住一点进行拖动,直到效果满意为止. 全光源壹(Omni):以圆形的形式,利用鼠标单击一点进工行拖动变大变小,直到效果满意为止. 点 光(Spotlight):我们可以随便单击一点使它变形,

4. 方向性：以偶极天线的水平面场型来看,电磁波强度在任意方向上都相等,这就是所谓的全向性(Omni-directional)辐射场型;但在垂直面场型中,电磁波强度则是在θ 等于90 度的方向上有最大值,是属于具有方向性(Directional)的辐射场型.

1. (天线、扩音器等)定向的
    If something such as a radio aerial, microphone, or loudspeaker is directional, it works most effectively in one direction, rather than equally in all directions at once.

    e.g. Dish aerials are highly directional...
           碟形卫星天线的定向性非常强。
    e.g. The directional microphone trained on Foresters Cottage could pick up every word uttered inside at several hundred yards.
           对准福雷斯特小屋的定向扩音器在几百码远的地方也能捕捉到里面的人所说的任何一句话。

2. 方向的;指向的
    Directional means relating to the direction in which something is pointing or going.

    e.g. Jets of compressed air gave the aircraft lateral and directional stability.
           压缩空气的喷吐使飞机的左右和前后都能保持稳定。

1. showing the way by conducting or leading
    imposing direction on

    e.g. felt his mother's directing arm around him
           the directional role of science on industrial progress

    Synonym: directingdirectiveguiding

2. relating to or indicating directions in space

    e.g. a directional microphone

3. relating to direction toward a (nonspatial) goal

    e.g. he tried to explain the directional trends of modern science