Сопротивление материалов / Nesmeyanov - Soprotivleniye materialov. Nestandartniye zadachi i podkhodi k ikh resheniyu 2005
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P0=Q(4+ |
16 12 13 )/13=1.32Q |
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(ɨɬɪɢɰɚɬɟɥɶɧɵɣ |
ɤɨɪɟɧɶ |
ɨɬɛɪɨɲɟɧ). ɉɪɟɞɟɥɶɧɚɹ ɧɚɝɪɭɡɤɚ |
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ɪɚɜɧɚ 19.8 kH; |
ɤɨɷɮɮɢɰɢɟɧɬ ɡɚɩɚɫɚ P0/P ɨɤɚɡɵɜɚɟɬɫɹ ɪɚɜ- |
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ɧɵɦ 1.98. |
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ɚ) |
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Ɂɚɦɟɬɢɦ, ɱɬɨ ɩɨɜɨɪɨɬ ɜɨɤɪɭɝ ɫɪɟɞɧɟɣ ɡɚɤɥɟɩɤɢ (ɩɟɪ- |
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ɜɵɣ ɦɟɯɚɧɢɡɦ, ɪɢɫ.29ɛ), ɤɚɡɚɥɨɫɶ, ɩɪɟɞɫɬɚɜɥɹɟɬ ɱɚɫɬɧɵɣ |
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ɫɥɭɱɚɣ ɜɬɨɪɨɝɨ ɪɚɫɫɦɨɬɪɟɧɧɨɝɨ ɦɟɯɚɧɢɡɦɚ, ɨɞɧɚɤɨ ɷɬɨ ɫɩɪɚ- |
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ɜɟɞɥɢɜɨ ɥɢɲɶ ɞɥɹ ɩɪɢɜɟɞɟɧɧɵɯ ɜ ɡɚɞɚɱɟ ɪɚɡɦɟɪɨɜ. ɉɪɢ L>2l |
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Qc |
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ɩɟɪɜɵɣ ɦɟɯɚɧɢɡɦ ɨɤɚɡɵɜɚɟɬɫɹ ɞɟɣɫɬɜɢɬɟɥɶɧɵɦ, ɚ ɜɬɨɪɨɣ |
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P0 |
ɞɚɫɬ ɛɨɥɟɟ ɜɵɫɨɤɨɟ ɡɧɚɱɟɧɢɟ ɩɪɟɞɟɥɶɧɨɣ ɧɚɝɪɭɡɤɢ. ɉɨɥɧɨɟ |
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ɛ) |
ɪɟɲɟɧɢɟ ɬɪɟɛɭɟɬ ɚɧɚɥɢɡɚ ɜɫɟɯ ɜɨɡɦɨɠɧɵɯ ɦɟɯɚɧɢɡɦɨɜ. |
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Ɂɚɞɚɧɢɟ 1. Ɋɚɫɫɦɨɬɪɢɬɟ ɫɢɬɭɚɰɢɸ ɫ ɞɜɭɦɹ ɡɚɤɥɟɩɤɚɦɢ. |
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Ɋɢɫ. 29 |
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ȼ ɱɟɦ ɛɭɞɟɬ ɨɬɥɢɱɢɟ ɩɪɢ ɪɟɲɟɧɢɢ ɡɚɞɚɱɢ? |
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Ɂɚɞɚɧɢɟ 2. ɍɜɟɥɢɱɢɬɫɹ ɥɢ ɡɚɩɚɫ ɩɪɨɱɧɨɫɬɢ, ɟɫɥɢ ɫɪɟɞɧɸɸ ɡɚɤɥɟɩɤɭ ɫɞɜɢɧɭɬɶ ɜɩɪɚɜɨ?
Ɂɚɞɚɱɚ 12. ɉɨɪɬɚɥɶɧɚɹ ɪɚɦɚ (pɢɫ.30) ɧɚɝɪɭɠɟɧɚ ɫɢɥɨɣ P ɜ ɬɨɱɤɟ ȼ. Ɉɩɪɟɞɟɥɢɬɶ ɭɝɨɥ ɩɨɜɨɪɨɬɚ ɫɟɱɟɧɢɹ Ⱥ, ɟɫɥɢ ɠɟɫɬɤɨɫɬɶ EI ɜɫɟɯ ɭɱɚɫɬɤɨɜ ɩɨɫɬɨɹɧɧɚ.
P B |
A |
P |
Ɋɟɲɟɧɢɟ. ɀɟɫɬɤɨɫɬɶ ɭɱɚɫɬɤɨɜ ɪɚɦɵ ɩɪɢ |
l ɪɚɫɬɹɠɟɧɢɢ-ɫɠɚɬɢɢ ES ɛɭɞɟɦ ɫɱɢɬɚɬɶ (ɤɚɤ
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ɨɛɵɱɧɨ) ɛɟɫɤɨɧɟɱɧɨɣ ɩɨ ɫɪɚɜɧɟɧɢɸ ɫ ɠɟɫɬ- |
l |
l |
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ɤɨɫɬɶɸ ɧɚ ɢɡɝɢɛ (EI), ɬɨɝɞɚ ɯɚɪɚɤɬɟɪ ɩɟɪɟ- |
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ɦɟɳɟɧɢɣ ɜ ɪɚɦɟ ɧɟ ɢɡɦɟɧɢɬɫɹ, ɟɫɥɢ ɫɢɥɭ ɩɟ- |
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ɪɟɧɟɫɬɢ ɜ ɫɟɪɟɞɢɧɭ ɭɱɚɫɬɤɚ Ⱥȼ (pɢɫ.31). Ɂɚ- |
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ɞɚɱɚ ɨɤɚɡɵɜɚɟɬɫɹ ɤɨɫɨɫɢɦɦɟɬɪɢɱɧɨɣ, ɩɨɷɬɨ- |
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Ɋɢɫ.30 |
Ɋɢɫ.31 |
ɦɭ ɜɵɛɟɪɟɦ ɫɢɦɦɟɬɪɢɱɧɭɸ ɨɫɧɨɜɧɭɸ ɫɢɫɬɟ- |
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ɦɭ (ɫɧɹɜ ɜɫɟ ɜɧɟɲɧɢɟ ɫɜɹɡɢ) ɢ ɩɨɫɬɪɨɢɦ ɤɨ- |
ɫɨɫɢɦɦɟɬɪɢɱɧɭɸ ɷɤɜɢɜɚɥɟɧɬɧɭɸ ɡɚɞɚɱɭ ɧɚ ɪɢɫ.32 (ɪɟɚɤɰɢɢ ɧɚɣɞɟɧɵ ɢɡ ɞɜɭɯ ɤɨɫɨɫɢɦɦɟɬɪɢɱɧɵɯ ɭɫɥɨɜɢɣ ɪɚɜɧɨɜɟɫɢɹ).
ȼɜɢɞɭ ɭɤɚɡɚɧɧɨɣ ɫɢɦɦɟɬɪɢɢ ɩɨɜɨɪɨɬ ɫɟɱɟɧɢɣ Ⱥ ɢ ȼ ɨɞɢɧɚɤɨɜ ɢ ɩɪɨɢɫɯɨɞɢɬ ɜ ɨɞɧɭ ɫɬɨɪɨɧɭ. ɇɚ ɪɢɫ.33 ɩɪɢɜɟɞɟɧɚ ɫɨɨɬɜɟɬɫɬɜɭɸɳɚɹ ɜɫɩɨɦɨɝɚɬɟɥɶɧɚɹ ɡɚɞɚɱɚ ɦɟɬɨɞɚ Ɇɨɪɚ – ɬɚɤɠɟ ɤɨɫɨɫɢɦɦɟɬɪɢɱɧɚɹ. ɗɤɜɢɜɚɥɟɧɬɧɚɹ ɩɨɫɥɟɞɧɟɣ ɡɚɞɚɱɚ ɩɨɤɚɡɚɧɚ ɧɚ ɪɢɫ.34, ɜɦɟɫɬɟ ɫ ɧɚɣɞɟɧɧɵɦɢ ɢɡ ɭɫɥɨɜɢɣ ɪɚɜɧɨɜɟɫɢɹ ɪɟɚɤɰɢɹɦɢ (ɤɚɤ ɢ ɢɫɯɨɞɧɚɹ
P |
1/2 |
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1/2 |
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ɡɚɞɚɱɚ, |
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ɜɫɩɨɦɨɝɚ- |
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1/2 |
ɬɟɥɶɧɚɹ |
ɫɬɚɬɢɱɟɫɤɢ |
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ɨɩɪɟɞɟɥɢɦɚ). ɗɩɸ- |
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ɪɵ |
ɢɡɝɢɛɚɸɳɢɯ |
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ɗ |
ȼɫ |
1/2 |
ɗɜɫ |
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ɦɨɦɟɧɬɨɜ |
ɜɟɫɶɦɚ |
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P/2 |
P/2 |
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F=0 |
F=0 |
ɩɪɨɫɬɵ; ɩɨɫɥɟ ɜɵ- |
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ɱɢɫɥɟɧɢɹ |
ɢɧɬɟɝɪɚɥɚ |
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P |
P |
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G=1/l |
G=1/l |
Ɇɨɪɚ ɩɨɥɭɱɢɦ MȺ= |
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=Mȼ=Pl2/(12EI). |
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Ɋɢɫ.32 |
Ɋɢɫ. 33 |
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Ɋɢɫ.34 |
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Ɂɚɞɚɱɚ 13. Ɉɩɪɟɞɟɥɢɬɶ ɩɨɬɟɧɰɢɚɥɶɧɭɸ ɷɧɟɪɝɢɸ, ɡɚɩɚɫɟɧɧɭɸ ɫɢɫɬɟɦɨɣ ɛɟɫɤɨɧɟɱɧɨɝɨ ɱɢɫɥɚ ɨɞɢɧɚɤɨɜɵɯ ɛɚɥɨɤ ɞɥɢɧɨɣ 2 ɢ ɠɟɫɬɤɨɫɬɶɸ EI (ɪɢɫ.35) ɩɪɢ ɧɚɝɪɭɠɟɧɢɢ ɟɟ ɫɢɥɨɣ P [2].
Ɋɟɲɟɧɢɟ. Ⱦɥɹ ɜɵɱɢɫɥɟɧɢɹ ɷɧɟɪɝɢɢ ɭɞɨɛɧɨ ɩɨɞɫɱɢɬɚɬɶ ɪɚɛɨɬɭ ɫɢɥɵ P, ɫɨɜɟɪɲɟɧɧɭɸ ɩɪɢ ɧɚɝɪɭɠɟɧɢɢ – ɧɚ ɩɟɪɟɦɟɳɟɧɢɢ ɬɨɱɤɢ Ⱥ. Ⱦɪɭɝɢɦɢ ɫɥɨɜɚɦɢ, ɫɥɟɞɭɟɬ ɧɚɣɬɢ ɠɟɫɬɤɨɫɬɶ ɫɢɫɬɟɦɵ (ɫ) ɩɪɢ ɞɚɧɧɨɦ ɧɚɝɪɭɠɟɧɢɢ. Ɉɫɨɛɟɧɧɨɫɬɶɸ ɡɚɞɚɱɢ ɹɜɥɹɟɬɫɹ ɬɨ, ɱɬɨ ɩɪɢ ɭɞɚɥɟɧɢɢ ɜɟɪɯɧɟɣ ɛɚɥɤɢ ɠɟɫɬɤɨɫɬɶ ɫɢɫɬɟɦɵ ɧɟ ɦɟɧɹɟɬɫɹ – ɜɜɢɞɭ ɛɟɫɤɨɧɟɱɧɨɝɨ ɱɢɫɥɚ ɛɚɥɨɤ. ɗɬɨ ɫɜɨɣɫɬɜɨ ɦɨɠɧɨ ɢɫɩɨɥɶɡɨɜɚɬɶ ɞɥɹ ɜɵɱɢɫɥɟɧɢɹ ɠɟɫɬɤɨɫɬɢ ɫ. ɇɚɣɞɟɦ ɫɢɥɭ, ɤɨɬɨɪɭɸ ɧɭɠɧɨ ɩɪɢɥɨɠɢɬɶ ɤ ɛɚɥɤɟ (ɪɢɫ.36), ɱɬɨɛɵ
Ɋ |
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Ⱥ |
c |
Ⱥ |
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Ɋɢɫ.36 |
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Ɋɢɫ.35 |
ɩɪɨɝɢɛ ɜ ɬɨɱɤɟ Ⱥ ɛɵɥ ɪɚɜɟɧ ɟɞɢɧɢɰɟ – ɟɫɥɢ ɩɪɚɜɵɣ ɤɨɧɟɰ ɨɩɢɪɚɟɬɫɹ ɧɚ ɩɪɭɠɢɧɭ ɢɫɤɨɦɨɣ ɠɟɫɬɤɨɫɬɢ. ȼɟɥɢɱɢɧɚ ɷɬɨɣ ɫɢɥɵ ɢ ɟɫɬɶ ɠɟɫɬɤɨɫɬɶ ɫ – ɩɨ ɨɩɪɟɞɟɥɟɧɢɸ.
ɉɪɨɝɢɛ ɫɟɱɟɧɢɹ A ɧɚ ɪɢɫ.36 ɪɚɜɟɧ ɫɭɦɦɟ ɩɪɨɝɢɛɚ ɛɚɥɤɢ ɧɚ ɠɟɫɬɤɢɯ ɨɩɨɪɚɯ ɢ ɩɨɥɨɜɢɧɵ ɨɫɚɞɤɢ ɩɪɭɠɢɧɵ. ɉɟɪɜɭɸ ɜɟɥɢɱɢɧɭ ɧɚɣɞɟɦ ɢɡ ɢɧɬɟɝɪɚɥɚ Ɇɨɪɚ, ɩɟɪɟɦɧɨɠɢɜ ɩɨɯɨɠɢɟ ɷɩɸɪɵ ɜ ɢɫɯɨɞɧɨɣ ɢ ɜɫɩɨɦɨɝɚɬɟɥɶɧɨɣ ɡɚɞɚɱɚɯ (ɡɞɟɫɶ ɢɯ ɧɟ ɢɦɟɟɬ ɫɦɵɫɥɚ ɩɪɢɜɨɞɢɬɶ), ɷɬɨ ɫɚ3/(6EI). Ɉɬɫɸɞɚ ɫɥɟɞɭɟɬ:
ɫɚ3/(6EI)+1/2 c/2 1/c=1
ɢ, ɡɧɚɱɢɬ,
c=9EI/(2a3).
ɉɟɪɟɦɟɳɟɧɢɟ ɬɨɱɤɢ A ɩɨɞ ɞɟɣɫɬɜɢɟɦ ɫɢɥɵ Ɋ ɪɚɜɧɨ
XA=Ɋ/c=2Pa3/(9EI)
ɢ ɪɚɛɨɬɚ ɫɢɥɵ Ɋ (ɩɟɪɟɯɨɞɹɳɚɹ ɜ ɩɨɬɟɧɰɢɚɥɶɧɭɸ ɷɧɟɪɝɢɸ ɫɢɫɬɟɦɵ W) ɪɚɜɧɚ ɊXA/2, ɨɬɤɭɞɚ ɫɥɟɞɭɟɬ ɨɬɜɟɬ: W=P2a3/(9EI).
Ɂɚɞɚɱɚ 14. ɗɥɟɦɟɧɬɵ ɮɟɪɦɵ, ɩɪɟɞɫɬɚɜɥɟɧɧɨɣ |
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ɧɚ ɪɢɫ.37, ɢɦɟɸɬ ɤɪɭɝɥɨɟ ɩɨɩɟɪɟɱɧɨɟ ɫɟɱɟɧɢɟ |
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(d=40 ɦɦ). Ⱦɚɧɨ: l=1.2 ɦ, D =300, E=2 105Mɉɚ, |
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VT=300 Mɉɚ. |
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ɇɚɣɬɢ ɞɨɩɭɫɬɢɦɨɟ ɡɧɚɱɟɧɢɟ ɫɢɥɵ P, ɟɫɥɢ ɧɨɪɦɚ- |
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ɬɢɜɧɵɣ ɤɨɷɮɮɢɰɢɟɧɬ ɡɚɩɚɫɚ ɩɪɨɱɧɨɫɬɢ ɪɚɜɟɧ |
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ɞɜɭɦ. |
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Ɋɟɲɟɧɢɟ. Ɂɚɞɚɱɚ ɤɨɫɨɫɢɦɦɟɬɪɢɱɧɚ ɢ ɩɨɬɨɦɭ |
Ɋɢɫ. 37 |
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ɫɬɟɪɠɟɧɶ 2 ɧɟ ɧɚɝɪɭɠɟɧ, ɭɫɢɥɢɹ |
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ɜ1 ɢ 3 ɫɬɟɪɠɧɟ ɧɚɯɨɞɹɬɫɹ ɢɡ ɭɫɥɨɜɢɹ ɪɚɜɧɨɜɟɫɢɹ. Ɉɞɧɚɤɨ, ɤɨɝɞɚ ɧɨɪɦɚɥɶɧɚɹ ɫɢɥɚ
ɜɫɬɟɪɠɧɟ 3 ɞɨɫɬɢɝɚɟɬ ɫɜɨɟɝɨ ɤɪɢɬɢɱɟɫɤɨɝɨ ɡɧɚɱɟɧɢɹ R3*, ɢɫɱɟɪɩɚɧɢɹ ɧɟɫɭɳɟɣ ɫɩɨɫɨɛɧɨɫɬɢ, ɜɫɥɟɞɫɬɜɢɟ ɫɬɚɬɢɱɟɫɤɨɣ ɧɟɨɩɪɟɞɟɥɢɦɨɫɬɢ ɤɨɧɫɬɪɭɤɰɢɢ, ɧɟ ɩɪɨɢɫɯɨ-
ɞɢɬ. ɉɪɢ ɞɚɥɶɧɟɣɲɟɦ ɪɨɫɬɟ ɫɢɥɵ P ɧɨɪɦɚɥɶɧɚɹ ɫɢɥɚ ɜ ɬɪɟɬɶɟɦ ɫɬɟɪɠɧɟ ɩɨɫɬɨɹɧɧɚ (ɫɥɟɞɫɬɜɢɟ ɝɢɩɨɬɟɡɵ ɦɚɥɨɫɬɢ ɩɟɪɟɦɟɳɟɧɢɣ), ɚ ɞɨɝɪɭɠɚɸɬɫɹ ɫɬɟɪɠɧɢ 1 ɢ 2. Ɋɚɛɨɬɚ ɤɨɧɫɬɪɭɤɰɢɢ ɩɟɪɟɫɬɚɟɬ ɛɵɬɶ ɫɢɦɦɟɬɪɢɱɧɨɣ, ɧɨ ɡɚɞɚɱɚ ɨɫɬɚɟɬɫɹ ɫɬɚɬɢɱɟɫɤɢ ɨɩɪɟɞɟɥɢɦɨɣ (R3* – ɢɡɜɟɫɬɧɨ).
ȼɨɡɦɨɠɧɵ ɞɜɚ ɦɟɯɚɧɢɡɦɚ ɪɚɡɪɭɲɟɧɢɹ: ɚ) ɩɨɬɟɪɹ ɭɫɬɨɣɱɢɜɨɫɬɢ ɫɬɟɪɠɧɹ 2 (ɪɢɫ.38) ɢ ɛ) ɞɨɫɬɢɠɟɧɢɟ ɧɚɩɪɹɠɟɧɢɟɦ ɜ ɫɬɟɪɠɧɟ 1 ɩɪɟɞɟɥɚ ɬɟɤɭɱɟɫɬɢ (ɪɢɫ.39).
Ɂɚɩɢɫɚɜ ɭɫɥɨɜɢɹ ɪɚɜɧɨɜɟɫɢɹ (ɫɭɦɦɵ
Ɋ( ɚ) |
P(0 |
ɛ) |
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ɦɨɦɟɧɬɨɜ ɨɬɧɨɫɢɬɟɥɶɧɨ ɬɨɱɟɤ A ɢ B), |
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ɩɨɥɭɱɢɦ ɫɨɨɬɜɟɬɫɬɜɭɸɳɢɟ ɩɪɟɞɟɥɶ- |
R* |
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ɧɵɟ ɧɚɝɪɭɡɤɢ. ɉɪɟɞɜɚɪɢɬɟɥɶɧɨ ɧɚɯɨ- |
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3 |
N Ɍ1 |
R*3 |
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R* |
ɞɢɦ ɝɢɛɤɨɫɬɢ ɫɬɟɪɠɧɟɣ (O2=120, O3 |
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Ⱥ |
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=138); ɧɟɬɪɭɞɧɨ ɜɢɞɟɬɶ (ɩɨ ɞɚɧɧɵɦ ɜ |
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ɡɚɞɚɱɟ E, ɢ VT), ɱɬɨ ɫɩɪɚɜɟɞɥɢɜɚ |
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Ɋɢɫ.38 |
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Ɋɢɫ.39 |
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ɮɨɪɦɭɥɚ ɗɣɥɟɪɚ: Ri*=S2ES/Oi2. ɇɚɣ- |
ɞɟɦ: Ɋ0(ɚ)=0.228 Ɇɇ, Ɋ0(ɛ)=0.257 Ɇɇ. Ɂɧɚɱɢɬ, ɩɪɨɢɫɯɨɞɢɬ ɩɨɥɧɨɟ ɢɫɱɟɪɩɚɧɢɟ ɧɟɫɭɳɟɣ ɫɩɨɫɨɛɧɨɫɬɢ ɩɨ ɭɫɬɨɣɱɢɜɨɫɬɢ; ɞɨɩɭɫɤɚɟɦɚɹ ɧɚɝɪɭɡɤɚ – 114 ɤɇ.
Ʌɂ Ɍ ȿ Ɋ Ⱥ Ɍ ɍ Ɋ Ⱥ
1.Ɇɟɬɨɞɢɱɟɫɤɢɟ ɭɤɚɡɚɧɢɹ ɩɨ ɪɟɲɟɧɢɸ ɡɚɞɚɱ 1-ɝɨ ɬɭɪɚ ȼɫɟɫɨɸɡɧɨɣ ɨɥɢɦɩɢɚɞɵ ɩɨ ɫɨɩɪɨɬɢɜɥɟɧɢɸ ɦɚɬɟɪɢɚɥɨɜ. – Ɇ.: ɆȼɌɍ ɢɦ. ɇ.ɗ.Ȼɚɭɦɚɧɚ, 1977. – 10 ɫ.
2.ɉɪɟɞɦɟɬɧɵɟ ɨɥɢɦɩɢɚɞɵ. Ɉɪɝɚɧɢɡɚɰɢɹ ɢ ɡɚɞɚɱɢ. Ɇɟɬɨɞɢɱɟɫɤɢɟ ɭɤɚɡɚɧɢɹ. – Ƚɨɪɶɤɢɣ: Ƚɉɂ ɢɦ. Ⱥ.Ⱥ.ɀɞɚɧɨɜɚ, 1986. – 104 ɫ.
3.Ȼɨɥɢ Ȼ., ɍɷɣɧɟɪ Ⱦɠ. Ɍɟɨɪɢɹ ɬɟɦɩɟɪɚɬɭɪɧɵɯ ɧɚɩɪɹɠɟɧɢɣ. Ɇ.: Ɇɢɪ, 1964. –
520 ɫ.
4.Ⱥɥɮɭɬɨɜ ɇ.Ⱥ. Ɉɫɧɨɜɵ ɪɚɫɱɟɬɚ ɧɚ ɭɫɬɨɣɱɢɜɨɫɬɶ ɭɩɪɭɝɢɯ ɫɢɫɬɟɦ. – Ɇ.: Ɇɚɲɢɧɨɫɬɪɨɟɧɢɟ, 1978. – 312 ɫ.
5.Ɏɟɨɞɨɫɶɟɜ ȼ.ɂ. ɂɡɛɪɚɧɧɵɟ ɡɚɞɚɱɢ ɢ ɜɨɩɪɨɫɵ ɩɨ ɫɨɩɪɨɬɢɜɥɟɧɢɸ ɦɚɬɟɪɢɚɥɨɜ. –
Ɇ.: ɇɚɭɤɚ, 1967.– 376 ɫ.
6.Ɋɭɛɢɧɢɧ Ɇ.ȼ. ɋɨɩɪɨɬɢɜɥɟɧɢɟ ɦɚɬɟɪɢɚɥɨɜ. – Ɇ.: Ɇɚɲɝɢɡ, 1961. – 468 ɫ.
7.Ʌɢɯɚɪɟɜ Ʉ.Ʉ., ɋɭɯɨɜɚ ɇ.Ⱥ. ɋɛɨɪɧɢɤ ɡɚɞɚɱ ɩɨ ɤɭɪɫɭ "ɋɨɩɪɨɬɢɜɥɟɧɢɟ ɦɚɬɟɪɢɚɥɨɜ": ɍɱɟɛ. ɩɨɫɨɛɢɟ ɞɥɹ ɦɚɲɢɧɨɫɬɪɨɢɬɟɥɶɧɵɯ ɜɭɡɨɜ. – Ɇ.: Ɇɚɲɢɧɨɫɬɪɨɟɧɢɟ,
1980. – 224 ɫ.