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: mirgari00
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: 09-11-11 22:46
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Intergal (C3/T * Csch (C3/T)) dT µµ ºÎÁ¤ÀûºÐÆûÀ¸·Î °è»êÀÌ °¡´ÉÇÒ°¡¿ä
Àß ¾ÈµÇ¼ ġȯÀûºÐÀ̳ª ºÎºÐÀûºÐÀÌ µÇÁö ¾Ê½À´Ï´Ù. ¤Ð.¤Ð
½ºÅ×Æijë
Stefano
09-11-14 14:40
(1) ºÎºÐÀûºÐ
¿ø·ÐÀûÀÎ À̾߱âÀÌ°í ÀÌ¹Ì ¾Ë°í ÀÖ´Â ³»¿ëÀÌ°ÚÁö¸¸ ºÎºÐÀûºÐÀÌ °¡´ÉÇÏ·Á¸é ´ÙÀ½ÇüÅ°¡ µÇ¾î¾ß ÇÒÅÍÀε¥..
d(UV)=UdV + VdU ---> UdV = d(UV) -VdU
C3/T¸¦ X¶ó°í ġȯÇϸé X=C3(1/T) --> T=C3/X --> dT =-C3 dX/X^2
¿ø½Ä = Integral { -(C3/X) * Csch X ) } dX ¸¦ ºÎºÐÀûºÐÀ¸·Î Ǭ´Ù¸é
U = (-C3/X), dV= Csch X dX; dU= -C3 dX/X^2, V= ln (Tanh X/2) À̸¦ ÀÌ¿ëÇÏ¿© °íÄ¡¸é
Integral { -(C3/X) * Csch X ) } dX= (- C3/X) * ln (Tanh X/2) - Integral {(-C3/X^2)*ln (Tanh X/2)} dX
¿©±â¼ ´Ù½Ã ¿ìÃøÀÇ µÎ¹ø° Ç×À» ºÎºÐÀûºÐÀ¸·Î Ç¥½ÃÇϸé
U = (-C3/X^2), dV= ln (Tanh X/2) dX; dU = 2C3 dX/X^3, V = ?? ÀÌ ¹æ¹ýÀº ¾î·Æ°í.. ´Ù¸¥ ¹æ¹ýÀ» ã¾Æº¸¸é
U=ln (Tanh X/2), dV=-C3 dX/X^2, dU = Csch X dX, V= C3/X
Integral { -(C3/X) * Csch X ) } dX = (- C3/X) * ln (Tanh X/2) - {C3/X ln (Tanh X/2)} + Integral { C3/X *Csch X dX} dX
À§ÀÇ ¼ö½ÄÀÇ ¸Ç ¿ìÃøÇ×À» ¿ÞÂÊÀ¸·Î ¿Å°Ü¼ Ç®¸é µÉ °Í °°Àºµ¥¿ä..
Integral { -(C3/X) * Csch X ) } dX = 1/2 [ (- C3/X) * ln (Tanh X/2) - {C3/X ln (Tanh X/2)} ] ....(1)
Ȥ½Ã ¼ö½ÄÀÌ Æ²·ÈÀ»Áöµµ ¸ð¸£´Ï Àß °ËÅäÇØ º¸¼¼¿ä.
(1) ºÎºÐÀûºÐ ¿ø·ÐÀûÀÎ À̾߱âÀÌ°í ÀÌ¹Ì ¾Ë°í ÀÖ´Â ³»¿ëÀÌ°ÚÁö¸¸ ºÎºÐÀûºÐÀÌ °¡´ÉÇÏ·Á¸é ´ÙÀ½ÇüÅ°¡ µÇ¾î¾ß ÇÒÅÍÀε¥.. d(UV)=UdV + VdU ---> UdV = d(UV) -VdU C3/T¸¦ X¶ó°í ġȯÇϸé X=C3(1/T) --> T=C3/X --> dT =-C3 dX/X^2 ¿ø½Ä = Integral { -(C3/X) * Csch X ) } dX ¸¦ ºÎºÐÀûºÐÀ¸·Î Ǭ´Ù¸é U = (-C3/X), dV= Csch X dX; dU= -C3 dX/X^2, V= ln (Tanh X/2) À̸¦ ÀÌ¿ëÇÏ¿© °íÄ¡¸é Integral { -(C3/X) * Csch X ) } dX= (- C3/X) * ln (Tanh X/2) - Integral {(-C3/X^2)*ln (Tanh X/2)} dX ¿©±â¼ ´Ù½Ã ¿ìÃøÀÇ µÎ¹ø° Ç×À» ºÎºÐÀûºÐÀ¸·Î Ç¥½ÃÇϸé U = (-C3/X^2), dV= ln (Tanh X/2) dX; dU = 2C3 dX/X^3, V = ?? ÀÌ ¹æ¹ýÀº ¾î·Æ°í.. ´Ù¸¥ ¹æ¹ýÀ» ã¾Æº¸¸é U=ln (Tanh X/2), dV=-C3 dX/X^2, dU = Csch X dX, V= C3/X Integral { -(C3/X) * Csch X ) } dX = (- C3/X) * ln (Tanh X/2) - {C3/X ln (Tanh X/2)} + Integral { C3/X *Csch X dX} dX À§ÀÇ ¼ö½ÄÀÇ ¸Ç ¿ìÃøÇ×À» ¿ÞÂÊÀ¸·Î ¿Å°Ü¼ Ç®¸é µÉ °Í °°Àºµ¥¿ä.. Integral { -(C3/X) * Csch X ) } dX = 1/2 [ (- C3/X) * ln (Tanh X/2) - {C3/X ln (Tanh X/2)} ] ....(1) Ȥ½Ã ¼ö½ÄÀÌ Æ²·ÈÀ»Áöµµ ¸ð¸£´Ï Àß °ËÅäÇØ º¸¼¼¿ä.
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