!"#$%% &' ()! &!BH# E.$ < < ^!"# ' c &!"! &!LZ 4S Z T\!T F E<6 6"+ #- :$1 -.F E< "(%!F&+" ' `!GF +'!" & &!G& (F V &!G +)%!* +", F&+M#-. (/-."`FT 0" 1!! &! 5 ' `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c =. O # )*Lb 89 # c# c#f BH# *! &!BH#+= % > [ BH# Fc \#
! &!BH# E.$ >.BH#!!!*&! 9! &!BH#c = 0.a U: ; ER S! &!BH#! @=. $ &!?"#$! "#$? B\#S "/ *! &!BH# ] < E E : E B; \#`.8! &!BH#G BH# = BH# S?! &!BH#.$ /5 ( #(. (?*.@?! &!BH#U G c? c * 98 T! &!BH# = 2"J89.! &!B H# O].].* BH#\ O]?! &!BH# E.. _ BH# E.$? Ec. V :! &!BH# c U FB5/! &!BH# E.:S4 *FW4 P ;?! &!BH# E?. BH# \ ]:" J. G: BH#. \ ]:. H.. a U.$ ;BH# c. U, -,"-VX, ` 5 ( $ 2'.91 /( '.) JI $ %8P! &!BH# = ;? C / / IU9E R?' [ %# E H.a*4! (- ),'. 0//.! ' GU WN % C=Q %2! = % %!& %'%4 C [ &! GSB *FWG ; BH# E.a* 4! (- ), (, /.! ; U?$& * * * E % = &! a?*.! &!BH# G *[.! &! =? %?*..c E.B &G < E -. Ec %? c : % &= \ @ D &#? & *,. : % a(/ #.(2,( +(&,()/ ),2 # & : ( &$$ C2! &!BH#. = 4 5 4 3 7! &!BH# = &! Q =28 = S - - 282 : VS<O H I V < b 2 S I 5 4 3 7 P &!!
>! S \ ] L! PT &! (a) * " C2! &!BH#? E. = 3 7c. BH# &! S =\)DR &! \ 7 = # \ #O] 9B #.I _# ^_ E. ].I Lb #. GFC. ] BH# T4 3 7 # \ W% =%\),. Q %?? &!. ].c : 82 ] b2. ]< 3 7. F : <2. (b) # -,"-VXa!"#$, " -,"-" '" " & 9B &! 3 7 F L &! PG # RS8 OBH# Pc D c G #$UR 8 ]F! &!BH#.G F. * BH# " FRSK] FM c3 &FH c F "J H =!&! 4 M c.8 FHc =F 8. * # " (a) (b) # ( -,"-VXa1!"#$(, "'" -,"-"
! &!BH# E.$ >< C2. %= # & a: 3 7 # & :, 7 &a Da 2 > 8 C2 # & N 3 7. %! a(3 /B a( /B L ] : ^_ E.! &! BH# % ] DE%W% = F &!"J S. ;! a * a M BH#= # -,"-VXa1, $!"#$, *-,"-" '" " & -,"-VXa1,$ 8$,&""3&* " *-,"- "'" " & a D/B /B! < > & < -,"-VXa,$?! &!BH#! &! "JM.`U >!!!! &! &! &! &! 1! &!BH#.G! D(G. ] * G! > &!G a.`u "J.G *.a`u LG 9.G] 89.c BH# LG VS G L]BH#. $ `U O.a`U B X] GG O.a`U ]B.a`UX] L G `UG G! &!BH#. : 3.c : N: 5 D:.: E c : BH# 8"J.`U!* ` U. : = E c : BH#.G!*.a`U G F. : = E c : BH#.G F * G.: = E c : BH# F "J H * " < G *. : E c : &!. J] & ]* *] ".c E 3! &!BH#.G. ]. L G! &! : "J89. C2%.G 4 %W%.3 : ; 67 W%. O= W%. W%,.
>! %,=. G BH#. S V L G W%. G BH#. S.W% *A Ec.! * `UEE4 + B BH# *!.,, %? M H ] 3* ] 3 O 2 SiO 2 CO SiC #,"- aij#!"#$," "#,"- '" " & #. - aij#!"#$.," "# - '" " & &!. #. % +( 6 9 /. #. )/ +( 6 9 /. #.J] 8 E & ]=E #.J]" & ] S #.B" J #.B"J &! #. _,"J: % &!#. 8 "J &H F : *+ &!8"J #., &! #. &!. ` U " J & &!= M < H R.G3 : 67. * G* * & =. *W &. * G:D> LD G & &! & =. * &!` U < `UI &! & = * L3I *:D G & G &!.G MN*67 L. T &!.UB =E ; 3 MN =`U`U T &!.U8B. )G P &!. 2.'H #Ra L _ &!.! &!B H# &! "J.B B J ] & (.B ( 7 < 7.- -. * &!.G *TI! ] O.c EB = * RS * 82 &=VSBcF. # & # +FB Hc F *. V R EB &!.J] & * ] R * "JcF= =V* "JcF BT8 FB H = -. *T RS * IJ E -* c F.G " /] = " *IJ] T &! B.8 G - BH#! &! `U = ; BH#E
! &!BH# E.$ > G! &!BH# E? \ F]:. : HBH#.. T M! &!BH# E?.G. ] G *. 4 a X BH#.! &!BH#=! DE% W% =c.., =,?! &!BH#= &!. ]. %= *TI 2cc. R E. ]F LbF 9B ] *" EBH#. ' %%"&$ $'!3 73 % C #! -, / +( /192 0 /(-,(/1 () -, /(! -, /(,/7 (..((. >?"#$c# /# ; > &'(., (, /..9,,( / (0.. 6 9(!?! 0,,) /.. (..(.9.1) ( ( ) /. +( + (! -, /() (.)(.9 /(). 2 << &'? /( 9(..9,)(.0 /(-,(/1 ()(- )- /6) -, /( / /( 0/ (/.9 01/1 (/ (.9 9+.)(9 ) -, /(- /( > < 9 ]+=BH# 3N +"/ a BH# a )P! &!B H#! D 3 121. D 3C C 3 1 (/ $ (,,( / (0! &!) -, /(, (,(9 2/ (-(9 0 (9, ()1 1. 0);(/,,1. 9 = %. BH# @A?,6.a52%& > S,! &!BH#. +,5 aa! &!BH#.$.: F.#R a@ +,5 a\a +B%. &! #c. O Oa B ' % ##" &5#& 6 9 /. 0). )9(. (.+.-(./ )./.., / 1- /+, 1. 0/ (-(). )(- )) (/2 << ''% 44' &' &&!6 9 /. ;.(/ )0&!9(, /(9 0-!5 &! 5 1.9(! ' ).9 /. 1. 0- /( ) (.)(