Download Methods and Techniques of Radar Recognition (Artech House by Victor G. Nebabin PDF
By Victor G. Nebabin
Now translated into English, this radar reference encompasses 25 years of serious radar popularity advances formerly unavailable within the West. info comprises assurance of popularity lower than countermeasures and popularity by utilizing passive tools.
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We know that our body is experiencing a force downward because of the gravitational attraction between it and the Earth. This gravitational force depends on the respective masses of our bodies and the Earth, but it also depends on our location: astronauts traveling into space feel less and less of a pull toward the Earth as they get farther away. Indeed, though the effect is small, we are even slightly “lighter” on a tall mountain or in an airplane at high altitude. 5 ELECTRIC AND MAGNETIC FIELDS 19 could construct a map of a “gravitational ﬁeld” encompassing the entire atmosphere, which would indicate the strength of gravity at any point.
4 THE PHYSICS OF ELECTRICITY Electromagnetic Induction While electric current creates a magnetic ﬁeld, the reverse effect also exists: magnetic ﬁelds, in turn, can inﬂuence electric charges and cause electric currents to ﬂow. However, there is an important twist: the magnetic ﬁeld must be changing in order to have any effect. A static magnetic ﬁeld, such as a bar magnet, will not cause any motion of nearby charge. Yet if there is any relative motion between the charge and the magnetic ﬁeld—for example, because either the magnet or the wire is being moved, or because the strength of the magnet itself is changing— then a force will be exerted on the charge, causing it to move.
The other extreme case is simply an open circuit, where the two terminals are separate and the resistance of the air between them is inﬁnite: here the current and the power consumption are obviously zero. Example Consider two incandescent light bulbs, with resistances of 240 V and 480 V. How much power do they each draw when connected to a 120 V outlet? 5 A. 25 A. 5 A)2 . 25 A)2 . 480 V ¼ 30 W. We see that at constant voltage, the bulb with twice the resistance draws half the power. There are other situations, however, where the current rather than the voltage is constant.