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 An instrument for measuring the first and second derivatives of lV characteristics of tunnel diodes and point contact diodes as a function of D.C. bias was designed. The principle of operation is based on the harmonic analysis of the current. The circuit involved is rather simple. As an example for the application of this instrument, plots of first and second derivatives of a tunnel diode and a point contact diode were shown. From the given results, it has been pointed out that tunnel diodes may be used... An instrument for measuring the first and second derivatives of lV characteristics of tunnel diodes and point contact diodes as a function of D.C. bias was designed. The principle of operation is based on the harmonic analysis of the current. The circuit involved is rather simple. As an example for the application of this instrument, plots of first and second derivatives of a tunnel diode and a point contact diode were shown. From the given results, it has been pointed out that tunnel diodes may be used in low level detectors.  本文提供测量隧道二极管伏安曲线二次微商与直流偏压关系的谐波分析法。着重讨论测量原理,电路设计和误差对结果的各种影响。同时,指出进行这项工作对隧道二极管应用和它的物理性质研究的意义。文中介绍了典型测量结果。并对隧道二极管作低电平检波器应用的价值作了一些定量的讨论。  This paper is the second report of a research project concerning the characteristics and evolution of the general circulation in recent ten years. The amplitude and the phase angle are calculated by means of 4term harmonic analysis for the monthly mean 500mb hight along the 55°N and 35°N lat. from 1951 to 1960. According to the spectral distribution and phase angle, the seasonal variation of the general circulation is discussed. The conclusions are the following:(1)There is a pronounced seasonal course... This paper is the second report of a research project concerning the characteristics and evolution of the general circulation in recent ten years. The amplitude and the phase angle are calculated by means of 4term harmonic analysis for the monthly mean 500mb hight along the 55°N and 35°N lat. from 1951 to 1960. According to the spectral distribution and phase angle, the seasonal variation of the general circulation is discussed. The conclusions are the following:(1)There is a pronounced seasonal course in the change of amplitudes of first and third harmonic. But this seasonal trend of the first and third harmonic at same latitude is opposite. The seasonal trend of the first or third harmonic at 55°N and 35°N lat. is also opposite. No clearly seasonal variation is revealed for the second harmonic.(2)The change of phase angle shows a regular seasonal course except for second harmonic at 55°N lat.(3)The variation of spectrum from 1951 to 1960 shows that the seasonal variation is different from year to year, but the general trend is the same for all years.(4)The characteristics of the spectrum of transitional seasons are clearly distinct from those of summer and winter, therefore the natural synoptic seasons may be clearly defined. The begining and ending as well as the length and character of the seasons vary from one year to another.(5)The weather anomaly in China has a close connection with the pattern of ultralong waves in northern hemisphere. This may be shown by examples of July 1954 and 1959, as well as February 1957 and 1960.  本文是作者研究近10年大气环流特征的第二部分。应用1951—1960年北半球500毫巴月平均图,用谐波分析方法计算了历年逐月55°N及35°N上波数1到4(第1到第4)波的振幅及位相角。由此分析了大气环流的季节变化。主要结果如下: 1.第1波及第3波的振幅均有明显的年变程,但趋势彼此相反。另外,第1波或第3波振幅本身在55°N及35°N年变程也相反。第2波振幅年变程不明显。 2.各波的位相角亦有明显而规则的年变程,只有55°N第2波的位相角季节变化不大。 3.从逐年波谱及位相来看,大气环流的季节变化各年虽有不同,但季节的趋势却是每年都一致的。 4.过渡季节的波谱与冬夏截然不同。因此一年可分为4个自然天气季节,但每年季节早晚、长短及特征均有一定差异。 5.北半球超长波特征与我国天气有密切关系,这可以从一些例子来说明,如1954年7月与1959年7月,1957年2月与1960年2月。  The Pertsev's method is used in the harmonic analysis of a month's tilt data (March 1972) from Shacheng, Hopei Province. The coefficient Υ and the phase difference Δδ of the semidiurnal constituents M2, S2, and N2 as well as the diurnal constituents K1 and Q1 of the tilts are obtained. The results for the semidiurnal constituents M2 and S2 are better than the others. The coefficient Υ for the NS component of M2 and S2 is respectively 0.84 and 0.86, and for the EW component isrespectively 0.81 and 0.77.... The Pertsev's method is used in the harmonic analysis of a month's tilt data (March 1972) from Shacheng, Hopei Province. The coefficient Υ and the phase difference Δδ of the semidiurnal constituents M2, S2, and N2 as well as the diurnal constituents K1 and Q1 of the tilts are obtained. The results for the semidiurnal constituents M2 and S2 are better than the others. The coefficient Υ for the NS component of M2 and S2 is respectively 0.84 and 0.86, and for the EW component isrespectively 0.81 and 0.77. The Υvalues of the NS component are a little greater than those of the EW component.  用别尔采夫方法对河北省沙城1972年3月份的地倾斜观测资资进行了调和分析,得出了三个主要半日波M_2、S_2、N_2和两个主要日波K_1、O_1的弹性系数γ和位相差△δ。其中半日波M_2、S_2的结果比较好。M_2、S_2波的弹性系数γ分别为:南北向0.84、0.86;东西向0.81、0.77。即东西向的弹性系数略小于南北向的弹性系数。   << 更多相关文摘 
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