[2012] !" !!"#$%&'&!()) (% *+ ,-!./ 01234567"(8&& φ φ 5!59: +3 ;<8&&%1=* 9>" ;?@%!)" ;A&&"(BCD&&%6 m a C C ±= λ φ ,?C/*EFG+ ! !"#$%&"$#"''#(%&"$)*+&$$ ;F3H7IJKLM(%NG*IN! 6- !!) ==73>6#OP!== G7I#K!7Q7RS==QS (5QDQ!()S# ;TU8SGD λ !59NIU-72 ;073HN).)V!59 N!!) =(3 M!&DS(5==6(I&S# FS WS)3() GV ())# ;A51X!)Y !- R"> ;AZ λ ∆ *Z[!) %!) #,-.%&"$#"(/0$1233(#$$##" K2*!"* PC!" !!"(VZ% a d i λ = [2012] O"7\!"]&!&G()Q()Q*!" W?^* !" !!"W* # G* !".]&!&G()Q\()- * !"W#O" !!"DQ!-I6*_*Z+ # 45#) J=(5(%*W6*G) G]`(%U() λ Q69#< =67Y=Ga7+ &)=YGa 5)6Ga YGa(b#c7Z"=d #9G!7I <Z%2 ;eV-2 đn wA hc hv +== λ O)LZ =*W* đn w &S(D= f))2 C @ C : mvw đn = 6-$$ c%`(%>()6N(5* 7RZ873U)_(*g=6 !)() h λ GV() λ `) C C C h φ λλλ −=∆=− c A L2() φ 2 T92`(%>4 G*7RZ8 .!! =73UZ8!7=! 4#K73UC=&=) `=*I!)73U c=)(3=*I!)73UG7!# [2012] 0!1Z7+&"=6(!)!1#6 %!) φ @≠ () λ *I!P=! =*I7I!)73U# V-(< fKS2 /, @ h @ d hchc ωω λ ω λ ++=+ fK&S2 hh e ppp += 782#$$##" ;T 7R !*Z !" !!"#0I4 M:!MC>&4 G7 6-. # ;AR*+ 2 >4 M:!MC *I ;KI *I2 c Y*IIX2 i `D,7`*-/ i (D*Z[=8 ;< 4*IV2A+C *I >&4 4X# 9:$+);,)* !16]6 (%>IIQ(6*+()#AR7 j.*Z7 3!1Qk*ZGa(% >73!1 < =>(?#,:@'"'?#A"; l!) Q&USaY&eZZQeZZ*Z4 %73Q7+&!)!1D(B!1 Q!-I [2012] !SeZZ"=Z%!SV# b λ 0Q=+m=Q& *!&!16] - ZZI.Q38& .!-&ZZb *W #M6] *(&ZZ)R *W # m=+ *W(R_** 9I!G "n F377IJKLM(%NG*IN! 6- !!) ==73>6#OP!== G7I#K!7Q7RS==#08 ==*S *W(R_* <"o2KI Q R*+ #KI *I!I+ 4*I ;T 7R !*Z !" !!"#0I4 M:!MC>&4 G7 6-. # ;AR*+ iM G4M:QMC `D!) G4M # i\ >M:QIMCIM 53G&M:!MC !)&*Z[ ;< 4*IV2A+C *I >&4 4X# <":@2 T!-()N GV()N) < ;F3H7IJKLM(%NG*IN! 6- !!) ==73>6#OP!== G7I#K!7Q7RS==QS (5QDQ!()S# [2012] TU<Q8SGD())>NIU -3 1 O- ∆ λ ? λ pi λ 3* λ ? :q :@ − -(+%*ZaX!-)V 5 <"::20' -nnO)' &*=rQb7 %W()>G-(6+2 0' *WV7Rs*7R !1# K' &*=r MGb7r2? C b ϕ λ FBiii^ C b ϕ λ kB#F*S λ - ϕ kS=# J!59Q+'?t,GI*Z67*9/ ϕ ϕ )-)iiii^G' ' <":C2KI&!1=72 !16]6 (%>IIQ(6*+()#AR7 j.*Z7 3!1Qk*ZGa(% >73!1 <":d20&G7IU m= l!) Q&USaY&eZZQeZZ*Z4 %73Q7+&!)!1D(B!1 Q!-I !SeZZ"=Z%!SV2 [2012] 0Q=+m=Q& *!&!16] - ZZI.Q38& .!-&ZZb *W #M6] *(&ZZ)R *W # m=+ *W(R_** 9I!G "n F377IJKLM(%NG*IN! 6- !!) ==73>6#OP!== G7I#K!7Q7RS==#08 ==*S *W(R_* <":q2c' 2 0' *WV7R*7R !1 # A45"(8& &*=r(R&(,M (1 C#:u/ <":v2cb7%WB() G`9V() **I-*,_*Z+/ # K* !"* P!" 7!"*II ? wd a λ G* !".]&!&G()Q\()- :q :@ λ − ∆ * !"W#O" !!"DQ!-I6*_ *Z+ # <":x2y&-nn [2012] y&P+LQf8 7R"*Z *8Q*8 8Lf Z8 &J?G!)2I6Z8 <":zK - K (5(7)*!! * # <":u2< !1(-8(%*Znn K6 !1*3@&\R(%R79Q!-G3@&\- 73 UQ"UbZSQ*G7+!1! R4 # B-CDB B- E#$$#F;G$ ;O5K9O"M 2 λ kLL =− :C 7 n k n kDD λ λ ==− :C ; a DK X D X ak n λ λ =⇒= d ;O"K2 λ / C : , :C +=− kLL ;\ !"2 a d i n λ = =HH1 ; C C :C λ +=− eLL ,cyJ&/ ;O"M 2 λ λ kn e =+ C C [2012] ;O"K2 λ λ / C : , C C +=+ ke =BIB ;cyJ&2 C C :C λ −=− neLL ;O"M 2 λ λ kne =− C C ;O"K2 λ λ / C : , C C +=− kne B0J=;K$ ;cyJ&2 CC C C :C λλ +−+=− R r eLL R r e C C =⇒ ;f*O"M 2 λ λ k R r =+ C C ;f*O"KZ2 λ λ / C : , C C +=+ k R r =#"5#F;G$ fR&3*=2 ϕ λ =a MGb7r3*=2 λ ϕ Cb a b m == A\<{2?C* A\.2?C*;: ;<K+2 b k λ ϕ = ;<A2 / C : , += k b λ ϕ [2012] L=5#'@ | ! U λ λ ϕ @ kn a k == f%2 );,)*2 q /, TTR δ = δ M qCu #|:@xzQv kmw − × *+&%-F);,)* q /, TaTR δ = 8BN# L()2 λ ω hc = ;\2 CC c hv c m == ω ;A&2 λ ω hc c p == 'ON#)2 #&5#) A hc = @ λ %P0;"; C C : VmAhv e += 8$$ ;() 2 C C Ch φ λλλ c += [2012] . [2012] . #,-.%&"$#"(/0$1233(#$$##" K2*!"* PC!" !!"(VZ% a d i λ = [2012] O"7!"]&!&G()Q()Q*!" W?^*. `=*I!)73U c=)(3=*I!)73UG7!# [2012] 0!1Z7+&"=6(!)!1#6