一、渐近线 定义:当曲线y=f(x)上的一动点P沿着曲线 移向无穷点时如果点P到某定直线L的距离 趋向于零,那么直线L就称为曲线y=f(x)的 一条渐近线

定理 如果函数f(x)在区间上的导数恒为零,那么f(x)在区 间上是一个常数 证明在区间上任取两点x1,x2(x1x2),应用拉格朗日 中值定理,就得

1 At a frequency of 796 Hz, compute Zo,u and for a line having the following parameters: F2230 u H/km,=0.0055 u F, r-6./km, g negligible. 2 At certain frequency, transmission line has Zo=5560°andy=0.005+j0.03np/km The line is 60 km long. A sinusoidal voltage of 100V at the specified frequency is applied to one end. Find:

1 Find F(s) if f(t) = (a)(t-3);(b)4t u(t-3); (c)4 cos to(t-3). 2 Obtain partial-fraction expansions for each of the following rational functions, and find the corresponding time functions:

12.6可降阶的高阶微分方程 一、yn=f(x)型的微分方程 二、y\f(x,y)型的微分方程 三、y=fv,y)型的微分方程

Any periodic waveform f(t)f(t) can be expressed by a Fourier series provided that (1) If it is discontinuous, there are only a finite number of discontinuous in the period T (2)It has a finite average value over the period T (3)It has a finite number of positive and negative maximums in the period T

ad prep.(后+acc.)到近于 albus,adj.A.白色的 alternatius,adj.A.互生的 annus,ad.a.一年生的 anthera,s.f.I.花药 arbor,s.f.II.乔木树木 aureus,adj.a.金黄色的

University of California,Davis 69.1 Modulation and Demodulation Jefferson F. Lindsey III Modulation. Superheterodyne Technique. Pulse-Code Southern Illinois University at Modulation. Frequency-Shift Keying. M-ary Phase-Shift Carbondale Keying. Quadrature Amplitude Modulation Dennis F. Doelitzsch 69.2 Radio 3-D Communications Standard Broadcasting (Amplitude Modulation).Frequency

Non-Inertial Reference Frame Gravitational attraction The Law of Universal Attraction was already introduced in lecture D1. The law postulates that the force of attraction between any two particles, of masses M and m, respectively, has a magnitude, F, given by F= (1) where r is the distance between the two particles, and G is the universal constant of gravitation. The value of G is empirically determined to be

In this lecture we will consider the equations that result from integrating Newtons second law, F=ma, in time. This will lead to the principle of linear impulse and momentum. This principle is very useful when solving problems in which we are interested in determining the global effect of a force acting on a particle over a time interval Linear momentum We consider the curvilinear motion of a particle of mass, m, under the influence of a force F. Assuming that