38.
t w = ()-1 = 0,56 (t ) = (w) =
F (t ) Re F(w), (1)
t - ; w = 2pf ; f - ; ; F (t ) ; Re F(w) ; F(w) = Re F(w) + Im F(w).
= (2)
- (3)
= (ln 10)/
- (4)
h - ; Dh - ( h ); t (. 39). (4) :
Dh 3j, (5)
Dh , j ;
h= Dh t. (6)
:
h w = w, (7)
h w - ; w - (. 39).
39.
1. t
t/tC | -2 | -I | |
0,301 | 0,222 | 0,196 | |
0,477 | 0,383 | 0,340 | |
0,602 | 0,501 | 0,449 | |
0,778 | 0,671 | 0,610 | |
1,041 | 0,929 | 0,860 | |
1,322 | 1,207 | 1,134 | |
1,491 | 1,375 | 1,300 | |
1,708 | 1,591 | 1,514 | |
2,004 | 1,887 | 1,810 | |
2,301 | 2,186 | 2,108 | |
2,479 | 2,361 | 2,283 | |
2,700 | 2,582 | 2,504 | |
3,000 | 2,883 | 2,804 |
. t/tC ; ; -2 2; -1 1.
2.
w = lg (w2/w1).
40.
1.
________ lAB____ lMN ______ _______________
________ _______ ____________ _________________
___________ _________ ___________
_______ ________ _________
___________________
__________________
/ | I, A | tC, c | DU, | DU, | h. % | , | p , × | |||||
M | N | DU | DU | |||||||||
:
:
:
2.
________ lA____ lMN ______ __________________________
____________ ___________ _______
|
|
___________ __________ ___________
___________________
_______________________
__________________
/ | I, A | tC, c | DU, | DU, | h. % | , | p , × | |||||
DU | DU | |||||||||||
:
:
:
3.
_________ _______________________________
_________________________ _______________
___________ ________ _____________
_______________________________________
____________________
/ | I, A | tC, c | DU, | DU, | h. % | , | p , × | |||||
lA | lMN | DU | DU | |||||||||
: : :
41. ( )
___________ lA ____ lMN ______ _______ _______________
________________ ______ _________ ____________
______________ ________ __________
1.
/ | I, A | t, c | DU, | DU, , tc, (0,5 5 15 30 45 60) | DU, 5 60// | h, % | , | , × | |||
M | N | ||||||||||
712 | |||||||||||
2.
/ | (M, N) | I, A | t, c | DU, | D U, | DU, (AB, BA) | DU, | h, % | , | , × | - | |
AB | BA | |||||||||||
2 - 3 | 9 - 10 | |||||||||||
:
:
:
42. j *
_____________________ lA _______________ lMN ______________ ________________________
_____________________ ________ ___________
____________________ _________ ____________
___________________ _____________________
f, | I , | U, | Â | Â | Â0 () = Â - Â | Â0 (-3) = Â0 () - Â0 (3) | |||
:
|
|
:
:
___________
* () (3) ; Â0 () Â0 () - Â0 (3) .
43. ( ) *
_____________________ lA _______________ lMN ______________ ________________________
_____________________ ________ ___________
____________________ _________ ____________
___________________ _____________________
, | I , | U, | D U, | (Â), (Â) | ÂMN =Â - Â | Â0 | Â = ÂMN - Â0 | j = Â × 0,056; j3 = Â3 × 0,169, | = D U/I., × | - | ||
6 - 7 | ||||||||||||
:
:
:
________
* ÂMN j ; Â0 ; .
44. ( ) *
_____________________ lA _______________ lMN ______________ ________________________
_____________________ ________ ___________
____________________ _________ ____________
___________________ _____________________
, | I , | U, | D U, | (Â), (Â) | m1 =Â - Â | Â0 (-3) | m = m1 - Â0 | j = (1,5m × 0,056), | = D U/I., × | - | ||
6 - 7 | ||||||||||||
:
:
:
________
* m1 - (-3) ; Â0 (-3) ; - .
45.
_____________________ lA _______________ lMN __________
___________________ ______
____________________ ______
____________________
_________________________
____________
_____________
________________________
IAB, | DU, | DU | , × | hw, % | ||
|
|
:
: :