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By Braja M. Das
Covers basics of soil dynamics, dynamic soil houses, origin vibration, soil liquefaction, pile origin and slope balance.
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By merely "dumping" or feeding some of the amplified radio signal (amplified by the rf or radio frequency amplifier) back to the antenna, the amplified signal could become reamplified and reamplified again, until very weak signals could be detected and heard. However, if too much reamplification took place, the entire Tickler Coil Grid Leak A+ B+ Figure 1-38 The Armstrong regenerative radio receiver. 50 Chapter 1 Review of Electronic Fundamentals circuit would oscillate or resonate at a particular frequency determined by the radio's tuning circuits.
FREQUENCY The number of cycles that occur in one second. Frequency and period are related by the equation: Section 1-8 The AC Circuit ~ f= 25 0-13) T Frequency has units of Hz, kHz, MHz, etc. Because the electrical generator was generally recognized as the first of the two methods used for frequency generation, it was common to plot waveforms of current and voltage versus an angular function such as degrees or radians. > This is still done to this day, not only for mechanical generators but also for electronic oscillators.
10 4 Time Constant (1") Figure 1-32 The RC time constant. 5 6 38 Chapter 1 Review of Electronic Fundamentals where t R C = = = time to fully charge capacitor (sec) value of resistor (ohms) value of capacitor (farads) Note: Many textbooks on control theory and electronics state that t = 5RC, as Eq. 1-36 shows. However, in theory, it takes at least six time constants to fully charge a capacitor. In practice, though, it is commonly agreed that five time constants is sufficiently accurate for most applications.
Principles of soil dynamics by Braja M. Das