地面的的翻译结果

地面的的翻译结果
Self-recording system is devised and used to measure potential gradient at Yenching.In fine weather the results show two maxima and two minima for a whole day.During raining potential gradient is constant at zero value,except when lightening and thunderstorm occur in which case the potential gradient changes rapidly both in magnitude and direction.本篇所述,为在北平燕京大学用静电计及一连续记录器测量大气电位梯度之方法及结果测量方法,乃用一种均位器(eqalizer)将离地面约3至6米高之电位显示于静电计上再用照相纸将此电位制成连续记录。

测量所得结果如下:晴天之电位梯度。

一日之中,有二最高值及二最低值雨时梯度即降至零,且此值非至雨止不变。

当闪电及雷飓时,梯度之方向与值,变易极速。

且较晴天时为大。

A tank experiment to study the rainfall characteristics,degree of slope and kinds of crops in relation to erosion of the Szechuan purple brown soil was carried out on the experimental farm of the University of Nanking in Chengtu during the period from1941to1945inclusive.The text consists of the results,of four years only,that of the first year being used for reference.本试验就成都南郊金陵大学农场利用箱具装置以求降雨,坡度及作物种类对于四川紫棕土冲蚀之关系,试验自1941年须始至1945年年底为止,本报告包括1942至1945年四年记录;最初一年记录仅供参考未列入计算。

试验中之箱具係木制,长1.8公尺,宽0.35公尺,
深0.33公尺,共四具,分别置于5%,10%,20%及30%之四种坡度上,内盛四川红色盆地中之一种紫棕色粘土。

降雨之时,每廿小时测定雨量,逕流及土壤冲矢量各一次,试验中192及1943两年行播芝蔴代表茎葉稀疏之作物,1944及1945年密播大豆代表茎菜密茂之作物。

四年结果中之要点如下:(i)本试验四年中成都年降水量总平均为959.9公厘,最少年为689.9公厘而最多年为489.8公厘,本试验芝蔴年度平均降水量为734.0公厘,而大豆年度平均降水量为1185.8公厘。

(ii)成都降雨烈度可暂按廿四小时内雨量,分为0—3.9m.m.,4—7.9m.m.,8—11.9m.m.,12—23.9m.m.,24—17.9m.m.,4(?)—95.6m.m.,96—191.9m.m.,等七级,四年中廿四小时内最多雨量可自84.2公厘至183.2公厘不等,此项烈雨可降于六月初...
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 relative...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。