Page 433 - index
P. 433
105-ɫɭɪɟɬ
– ɤɟɥɬɿɪɿɥɝɟɧ ɬԝɪԑɵɡɭɞɚԑɵ ԕɵɫɵɦ ɛԝɪɵɲɵɧɵԙ ɟԙ ԛɥɤɟɧ ɲɚɦɚɫɵ ( max )
-ɦ ɲɚɦɚɫɵɧɚ ɬɟԙ ɛɨɥɚɞɵ. ɋɨɧɵɦɟɧ ԕɨɫɚ, scs ɝɪɚɮɢɝɿɧɿԙ ɤɟɡ ɤɟɥɝɟɧ b2
ɧԛɤɬɟɫɿ ɠԝɞɵɪɵԕɲɚɧɵԙ ɰɟɧɬɪɿ O ɠԥɧɟ b2 p ɨɪɞɢɧɚɬɵ b2O p ԛɲɛԝɪɵɲɵɧ
ԕԝɪɚɣɞɵ. Ȼԝɥ ԛɲɛԝɪɵɲ 104-ɫɭɪɟɬɬɟɝɿ ɠɵɥɞɚɦɞɵԕɬɚɪɞɵԙ ɬԧԙɤɟɪɿɥɝɟɧ
ɩɥɚɧɵɦɟɧ ( b2 pb1 ) ɞԥɥ ɤɟɥɟɞɿ.
ȿɝɟɪ ɚɭɵɬԕɵԑɚɧ ɢɬɟɪɝɿɲɬɿ ɩɚɣɞɚɥɚɧɫɚ, ɨɧɞɚ ɦԛɦɤɿɧ ɛԝɪɵɲɬɵԙ ɲɚɦɚɫɵɧ
(-ɦ ) ԧɡɝɟɪɬɩɟɣ-ɚԕ, ɛɚɫɬɚɩԕɵ ɪɚɞɢɭɫɬɵ ( R0 ) ɤɿɲɿɪɟɣɬɭɝɟ ɛɨɥɚɞɵ. Ɉɥ ɤɟɡɞɟ,
ɠԝɞɵɪɵԕɲɚɧɵԙ ɚɣɧɚɥɭ ɰɟɧɬɪɿ Ɉ – ɠɚɧɚɦɚ (WW ) ɦɟɧ B0 ɧԛɤɬɟɫɿ ɚɪԕɵɥɵ s
ɨɫɿɧɟ -ɦ ɛԝɪɵɲɵɦɟɧ ɤԧɥɛɟɭ ɠԛɪɝɿɡɿɥɝɟɧ ɬԛɡɭɞɿԙ ԕɢɵɥɵɫɭ ɧԛɤɬɟɫɿɧɞɟ
ɠɚɬɚɞɵ (105 Ω-ɫɭɪɟɬ). Ȼԝɥ ɧԛɤɬɟɧɿԙ ( Ɉ ) ɨɪɧɵ ɚɭɵɬԕɭ ( ɟ ) ɦɟɧ ɛɚɫɬɚɩԕɵ
ɪɚɞɢɭɫ ( R0 ) ɚɪԕɵɥɵ ɚɧɵԕɬɚɥɚɞɵ.
Ƚɟɨɦɟɬɪɢɹɥɵԕ ɬԝɣɵԕɬɚɭ ɤɟɡɿɧɞɟ, ɲɵԑɭ ɛɭɵɧɵ ɤԧɬɟɪɿɥɭ ɮɚɡɚɫɵɧɞɚ ɞɚ,
ɬԧɦɟɧ ɬԛɫɭ ɮɚɡɚɫɵɧɞɚ ɞɚ ɠɟɬɟɤɲɿ ɛɭɵɧ ɛɨɥɵɩ ɬɚɛɵɥɚɞɵ. ɋɨɧɞɵԕɬɚɧ scs
ɝɪɚɮɢɝɿ ɟɤɿ ɮɚɡɚ ԛɲɿɧ ɞɟ ɬԝɪԑɵɡɵɥɚɞɵ, ɚɥ ɠԝɞɵɪɵԕɲɚɧɵԙ ɚɣɧɚɥɭ ɰɟɧɬɪɿ
ɲɬɪɢɯɬɚɥԑɚɧ ɚɣɦɚԕԕɚ ɨɪɧɚɥɚɫɵɩ, WW ɠԥɧɟ W cW c ɠɚɧɚɦɚɥɚɪɵɧɵԙ ԕɢɵɥɵɫɭ
ɧԛɤɬɟɫɿɧɞɟ ɠɚɬɚɞɵ (106-ɫɭɪɟɬ).
Ȼɚɫɬɚɩԕɵ ɪɚɞɢɭɫɬɵԙ ɨɪɬɚɥɵԕ ɢɬɟɪɝɿɲ ɤɟɡɿɧɞɟɝɿ ɟԙ ɚɡ ɲɚɦɚɫɵ ( R0min )
ɠԝɞɵɪɵԕɲɚɧɵԙ ɚɣɧɚɥɭ ɰɟɧɬɪɿ Ɉc ɧԛɤɬɟɫɿɧɞɟ ɛɨɥԑɚɧɞɚ, ɚɥ ɚɭɵɬԕɭ ɢɬɟɪɝɿɲ
ɤɟɡɿɧɞɟɝɿ ɟԙ ɚɡ ɲɚɦɚɫɵ ( R0min ) ɠԝɞɵɪɵԕɲɚɧɵԙ ɚɣɧɚɥɭ ɰɟɧɬɪɿ Ɉ ɧԛɤɬɟɫɿɧɞɟ
ɛɨɥԑɚɧɞɚ ɚɥɵɧɚɞɵ.
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