查询词典 parabolas

Studying the changes of All contents in manure during its composting, the results showed, the change trends of four kinds of manure were all parabolas, but the change rates were different.

摘 要：研究粪肥堆腐过程中尿囊素含量变化表明：4种粪肥的变化趋势相同即呈抛物线型，但变化的速度不同。

Efficiency of 2 el. bi-quad feed with parabolas having different F/D ratio

图。18。用叠加双菱天线做馈源的不同F/D比率的偏馈抛物面天线的效率 19 November，2009 2.4GHz 抛物面天线的高效馈源 Fig。

However, if you want to use the cheap production of SAT TV offset parabolas for the work on HAM or WLAN frequencies; you have to try to construct a feed that matches those parabolic reflectors.

无论如何，如果你想用一个低制作成本的卫星电视偏馈抛物面天线，工作于业余无线电频段或者WLAN波段，你必须制作一个与现有抛物面反射器相配的馈源。

I presented some diagrams of efficiency of a coffee can with different diameters as feeds for parabolas with different F/D and it is very clear how efficiently they work with offset dishes whose F/D is in the range 0.7-0.9.

我提供一些不同直径的咖啡罐做不同F/D的抛物面的馈源的效率图表，可以清楚的看出，当偏馈抛物面天线的F/D在0.7-0.9范围时，它们的工作效率如何。

That is, the vertical radiation angle is too narrow for the illumination of SAT TV offset parabolas, and horizontal is too wide, as shown in the figures.

原因是它的垂直方向角非常狭窄，换句话说，对于偏馈卫星电视抛物面天线来说，垂直方向角太狭窄了，而水平方向角又太宽了，如图所示。

And his entry for the most important competition of his life was a series of sketches of triangles and random parabolas, free shapes bounded by "curves in space geometrically undefined".

在他职业生涯最重要的那次比赛中，他的参赛作品是一连串令人目眩的形态组合图：三角形、恣肆凌乱的抛物线以及未能在空间几何学上明确定义的无数曲线，这些曲线环绕着看似信手涂鸦而来的图形。

The shells of the competition entry were originally of undefined geometry, but, early in the design process, the "shells" were perceived as a series of parabolas supported by precast concrete ribs.

在最初的歌剧院设计竞赛中，这些壳并没有几何学上的定义，但在设计过程的开始阶段，这些&壳&被定义为由一系列的混凝土肋骨支撑起来的抛物线。

Beginning with parabolas, the author explores the issue of 定点 between a line and a parabola, eclipse, or hyperbola.

笔者从抛物线入手，对抛物线、椭圆、双曲线与直线结合的定点问题作了一个探索。

A 3D corner reflector antenna, with dimensions of 1.7 wavelengths, still has too narrow a vertical diagram and is suitable only for very shallow offset parabolas, with F/D of about 1 and more.

一个尺寸为1.7波长的3D角反射器天线，垂直方向图非常狭窄，只适合很浅的偏馈抛物面天线，其F/D大约1或者更多。

It is obvious that 3D corner reflector antenna could be also adjusted for offset parabolas with a lower F/D if the diagram could be widen in vertical plane and narrowed in horizontal plane so that they are approximately equal to each other and at the same time retain all other good characteristics of this antenna.

显然，3D角反射器天线也必须调整才能用于低F/D的偏馈抛物面，如果它的垂直方向图必须宽，水平方向图必须窄，那么垂直和水平两者之间必须大体平衡，而同时要保持天线的其它所有良好特性。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。