kyRe
S?vbB[m2Ĝ*?BKB2 R
SaA
9 ?2m`2b *H+mHi`B+2b miQ`Bbû2b
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#`ĕK2 iB2Mi +QKTi2 /m i2KTb Mû+2bbB`2 TQm` 2tTHQ`2` +2b TBbi2b 2i ûH#Q`2` mM `BbQMM2K2MiX
6BM kyRk- mM2 bQ+Bûiû ;û`Mi H T`Q/m+iBQM 2i H /Bbi`B#miBQM /Ƕ2m /2 HǶ;;HQKû`iBQM /m :`M/ M;QmHāK2 URRy yyy ?#BiMib bm` Re +QKKmM2bV /û+B/û /2 bm#biBim2` H2b /2mt KQi2m`b bvM+?`QM2b 2Mi`BMMi H TQKT2 HBK2MiMi H2 +?i2m /Ƕ2m /2 _m2HH2 bm` hQmp`2 T` mM b2mH KQi2m` bvM+?`QM2 ¨ BKMib T2`KM2Mib /2 TmBb@
bM+2 j8y q ¨ R8yy i`਼KBMƐR+QKKM/û T` mM p`Bi2m` bTû+B}[m2X JāK2 bǶBH bǶ;Bi H2 THmb bQmp2Mi /2 `û;BK2 +QMiBMm- +2 /2`MB2` T`iB+BT2 ¨ `û/mB`2 H 7+im`2 ûM2`;ûiB[m2 HQ`b /2 p`BiBQMb /2 /û#Bi BKTQbû2bX G2b T2`i2b
`QiQ`B[m2b /ǶmM KQi2m` bvM+?`QM2 UHBû2b ¨ H /Bzû`2M+2 /2 pBi2bb2 2Mi`2 H2 `QiQ` 2i H2 +?KT biiQ`B[m2 iQm`MMi U;HBbb2K2MiVV `2T`ûb2Mi2Mi T`ĕb /m iB2`b /2b T2`i2b iQiH2bX G2b T2`i2b /Mb mM `QiQ` ¨ BKMib T2`KM2Mib bQMi Mû;HB;2#H2b 2M +QKT`BbQM 2i H2 p`Bi2m` MǶm;K2Mi2 H +QMbQKKiBQM ûM2`;ûiB[m2 [m2 /2 jWX G +QMbQKK@
iBQM ûM2`;ûiB[m2 /2 HǶBMbiHHiBQM 2bi `û/mBi2 /2 RyW T` Kĕi`2 +m#2 i`Mb7û`û 2i HǶBMbiHHiBQM T2mi bbm`2` mM /û#Bi /2 RR8W /2 bQM `û;BK2 MQKBMH T2M/Mi H2b 3 ? /2 i`B7 /2 MmBi /2 +QMbQKKiBQM ûH2+i`B[m2X lM2 ûim/2 KQMi`û [m2 H2 bm`+Qȿi HBû ¨ H pBi2bb2 p`B#H2 b2`Bi KQ`iB 2M R9 KQBbX
.Mb +2 bmD2i- MQmb MQmb BMiû`2bb2`QMb ¨ mM2 mi`2 BMbiHHiBQM /2 KāK2 ivT2X T`ĕb pQB` ûpHmû H2b T2`i2b /2 +?`;2 /Mb H2b 39yy K /2 +QM/mBi `2HBMi H TQKT2 m +?i2m /Ƕ2m- MQmb T`QTQb2`QMb mM2 TQKT2 +2Mi`B7m;2 m TQBMi /2 7QM+iBQMM2K2Mi +QMp2M#H2 +QKTi2 i2Mm /m /û#Bi 2i /2 H ?mi2m` KMQKûi`B[m2 iQiH2X lM2 i`QBbBĕK2 T`iB2 b2` +QMb+`û2 ¨ HǶûim/2 /2 T`BM+BT2 /ǶmM KQi2m` bvM+?`QM2 ¨ BKMib T2`KM2Mib +2Mbû 2Mi`BM2` +?+mM2 /2b TQKT2bX
A S2`i2b /2 +?`;2 /Mb H2b +QM/mBi2b
>Q`KBb H [m2biBQM AX"Xj bm` H2b T2`i2b bBM;mHBĕ`2b- MQmb +QMbB/û`2`QMb /Mb iQmi2 +2ii2 T`iB2 /2b +QM/mBi2b
`2+iBHB;M2b ¨ b2+iBQM +B`+mHB`2 +QMbiMi2X
AX Ĝ 6HmB/2 2M û+QmH2K2Mi ?QKQ;ĕM2 BM+QKT`2bbB#H2 HKBMB`2
AXXRV Zm2 /2pB2Mi H `2HiBQM /2 "2`MQmHHB /ǶmM ~mB/2 pBb[m2mt 2M `û;BK2 HKBMB`2 biiBQM@
MB`2 \
V_TT2H2` H2b /û}MBiBQMb /ǶmM û+QmH2K2Mi T`7Bi /2 ~mB/2- /ǶmM û+QmH2K2Mi ?QKQ;ĕM2 BM+QKT`2bbB#H2- /ǶmM û+QmH2K2Mi biiBQMMB`2X
#V.Mb H2 +b /ǶmM~mB/2 T`7Bi2M û+QmH2K2Mi ?QKQ;ĕM2 BM+QKT`2bbB#H2 biiBQMMB`2- `2i`Qmp2` H `2HiBQM /2
"2`MQmHHB ¨ T`iB` /m T`2KB2` T`BM+BT2 /2 H i?2`KQ/vMKB[m2 2tT`BKû `2HiBp2K2Mi ¨ mM bvbiĕK2 Qmp2`i 2M
`û;BK2 T2`KM2MiX S`û+Bb2` HQ`b H ;`M/2m` pQHmKB[m2 ûM2`;ûiB[m2Ԕյ mMB7Q`K2 bm` mM2 HB;M2 /2 +Qm`MiX PM HmB bbQ+B2` mM2 ?mi2m`ӽTT2Hû2 ?mi2m` KMQKûi`B[m2 Qm +?`;2 iQiH2 ,
ӽ ԩ ԟ ᅶԖ ԥϵ
Ԗ
Qɍԩ2bi HǶHiBim/2-ԟH T`2bbBQM 2iԥH pBi2bb2 /m ~mB/2 m TQBMi +QMbB/û`û-ᅶb Kbb2 pQHmKB[m2 2iԖHǶ++ûHû`iBQM /2 H T2bMi2m` UԖ N਼T·ϵVX S`û+Bb2` H `2HiBQM 2Mi`2Ԕյ2iӽX
+V.Mb [m2HH2b xQM2b /2 HǶû+QmH2K2Mi HKBMB`2 /ǶmM ~mB/2 `û2H- HǶ?vTQi?ĕb2 /ǶmM û+QmH2K2Mi T`7Bi 2bi@2HH2 BM2MpBb;2#H2 \
/VaB QM iB2Mi +QKTi2 /2 H pBb+QbBiû /m ~mB/2 BM+QKT`2bbB#H2 2i 2M TQbimHMi iQmDQm`b mM `û;BK2 biiBQMMB`2- H ;`M/2m` pQHmKB[m2 ûM2`;ûiB[m2Ԕյ /û}MB2 T`û+û/2KK2Mi /BKBMm2 /2Ӷ¨ӷH2 HQM; /ǶmM2 HB;M2 /2 +Qm`MiX _2HB2` +2ii2 p`BiBQM /ǶûM2`;B2 pQHmKB[m2 ¨ mM2 BMiû;`H2 /2 +B`+mHiBQM /2Ӷ¨ӷ/2 H /2MbBiû pQHmKB[m2 /2 7Q`+2 /2 pBb+QbBiûԕϾЏϣͩܙ X
2V.Mb mM ~mB/2 BM+QKT`2bbB#H2 pBb[m2mt- H /2MbBiû pQHmKB[m2 /2 7Q`+2 /2 pBb+QbBiû bǶû+`BiԕϾЏϣͩܙ ᅬ ܙԥ- Qɍᅬ 2bi H pBb+QbBiû /vMKB[m2 /m ~mB/2 2i ܙԥH2 HTH+B2M p2+iQ`B2H /2 H pBi2bb2 HQ+H2X
1M /û/mB`2- bQmb 7Q`K2 BMiû;`H2- H p`BiBQMӽ ӷ ਲ ӽ Ӷ/2 ?mi2m` KMQKûi`B[m2 /ǶmM TQBMiӶ¨ mM TQBMi ӷH2 HQM; /ǶmM2 HB;M2 /2 +Qm`Mi HHMi /2Ӷ¨ӷX G [mMiBiûӽ ӽ Ӷ ਲ ӽ ӷUTQbBiBp2 Qm MmHH2V bǶTT2HH2 H T2`i2 /2 +?`;2X
kyRe@yk@kj Rd,kd,jk S;2 kf3 AXXkV ú+QmH2K2Mi /2 SQBb2mBHH2
PM ûim/B2 H2 +b T`iB+mHB2` /2 HǶû+QmH2K2Mi HKBMB`2 /ǶmM ~mB/2 pBb[m2mt BM+QKT`2bbB#H2 /Mb mM2 +QM/mBi2
`2+iBHB;M2- /2 /B`2+iBQM ֓ܙԔ ?Q`BxQMiH2- /2 b2+iBQM +B`+mHB`2Ԉ+QMbiMi2 U/2 `vQMԡЈVX *QKTi2 i2Mm /2b bvKûi`B2b /m T`Q#HĕK2- H2 +?KT /2b pBi2bb2b bǶ2tT`BK2 bQmb H 7Q`K2 ܙԥ Ԃ ԥ ԡ ԧ ܙԔ֓Qɍԡ ఄԨϵ ԩϵ 2bi H /BbiM+2 /m TQBMiԂ¨ HǶt2 /2 `ûpQHmiBQM /2 H +QM/mBi2X
V JQMi`2` [m2 H pBi2bb2ԥ ԡ ԧM2 T2mi /ûT2M/`2 /2ԧX
#V 1M bmTTQbMi H T2`i2 /2 +?`;2 HBMûB[m2 mMB7Q`K2 iQmi m HQM; /2 H +QM/mBi2 2i 2M MQiMiၫӽ
ၫԧ ਲԐUp2+
Ԑ V- KQMi`2` [m2
ԥ ԡ ԥζ͘Ђ ਲ ॼ ԡԡЈॽϵও p2+ ԥζ͘Ђ ᅶԖԐᅬ ԡϵЈ .Mb H bvKûi`B2 /m T`Q#HĕK2- QM
ܙԥ ԥ֓ ֓ܙԔ ԡ ၫၫԡ ԡၫԥ֓
ၫԡ ও ܙԔ֓
+V G pBi2bb2 /û#BiMi2Ԋbm` mM2 b2+iBQM /`QBi2 2bi H pBi2bb2 [mB- mMB7Q`K2 bm` H b2+iBQMԈ- +Q``2bTQM/ m KāK2 /û#Bi pQHmKB[m2ԆX
1tT`BK2` +2ii2 pBi2bb2 2M 7QM+iBQM /2ԥζ͘Ђ2i 2M /û/mB`2ԥ ԡ2M 7QM+iBQM /m /û#Bi pQHmKB[m2Ԇ/2 ~mB/2 /Mb H +QM/mBi2X
/V PM bQm?Bi2 mM /û#Bi /Ƕ2MpB`QM jy G਼bƐR /Mb mM2 +QM/mBi2 /2 /BKĕi`2ӹ DNX .Mb mM2 +QM/mBi2 +vHBM/`B[m2- H i`MbBiBQM HKBMB`2 im`#mH2Mi2 b2 bBim2 mt H2MiQm`b /2 MQK#`2b /2 _2vMQH/b /2 kjyy U/Mb HǶ2tT`2bbBQM /m MQK#`2 /2 _2vMQH/b- QM +?QBbB` `2bT2+iBp2K2MiԊ2iӹ+QKK2 Q`/`2b /2 ;`M/2m` /2 H pBi2bb2 /m ~mB/2 2i /2 H /BK2MbBQM i`Mbp2`bH2 /2 HǶû+QmH2K2MiVX
ਲ *b /ǶmM2 ?mBH2 Ua1@NyV TQm` H[m2HH2ᅬ 1B਼T·φ2iᅶ LH਼N·ϯ
r *H+mH2` H T2`i2 /2 +?`;2 HBMûB[m2 2i /QM+ H bm`T`2bbBQM Mû+2bbB`2 TQm` H2 i`MbTQ`i /2 +2ii2 ?mBH2 bm`
mM i`QMÏQM /2 8y KX
r *H+mH2` H2 MQK#`2 /2 _2vMQH/b /2 HǶû+QmH2K2MiX *QM+Hm`2X ਲ *b /2 HǶ2m ,ᅬ ·ϯ1B਼T·φ2iᅶ ϯLH਼N·ϯX
r *H+mH2` H2 MQK#`2 /2 _2vMQH/b /2 HǶû+QmH2K2MiX *QM+Hm`2X
AX" Ĝ 6HmB/2 pBb[m2mt ?QKQ;ĕM2 BM+QKT`2bbB#H2 2M `û;BK2 im`#mH2Mi AX"XRV *?`;2 KQv2MM2 /Mb mM2 b2+iBQM ¨ bvKûi`B2 /2 `ûpQHmiBQM
G +?`;2ӽ- 2tT`BKû2 2M mM TQBMiԂ/2 HǶû+QmH2K2Mi- TT`Bi +QKK2 mM2 7QM+iBQMӽ ԧ ԡ/2ԧ2i /2ԡX PM /û}MBi mM2 +?`;2 KQv2MM2ӽ ԧ~ KQv2MMû2 bm` mM2 b2+iBQM /2 +QM/mBi2 T`
ӽ ԧ ௳~
ϣ΄ͩϬЏπμ
ӽ ԧ ԡEԆԆ
QɍEԆ2bi H2 /û#Bi pQHmKB[m2 i`p2`bMi mM ûHûK2Mi /2 bm`7+2EԈ /2 H b2+iBQM /2 H +QM/mBi2 2iԆH2 /û#Bi pQHmKB[m2 iQiH /2 H +QM/mBi2X
SQm` 2tT`BK2` H2 i2`K2 +BMûiB[m2 /2 H +?`;2 2M 7QM+iBQM /2 H pBi2bb2 /û#BiMi2Ԋ- QM BMi`Q/mBi H2 +Q2{+B2Mi /2
*Q`BQHBb ,ᅦ ԅԅվ ϷμЏΒπϝζ΄վ ϝс΄ΰΰ΄
- Qɍԅվ ϝс΄ΰΰ΄2bi H TmBbbM+2 +BMûiB[m2 i`p2`bMi H b2+iBQMԈ/2 +QM/mBi2 2iԅվ ϷμЏΒπϝζ΄
H TmBbbM+2 +BMûiB[m2 [mB i`p2`b2`Bi +2ii2 b2+iBQM TQm` mM2 pBi2bb2 mMB7Q`K2 ԊU+?[m2 T`iB+mH2 /2 ~mB/2 i`p2`b2 H b2+iBQMԈ¨ H pBi2bb2ԥ ԡ- 2KTQ`iMi p2+ 2HH2 bQM ûM2`;B2 +BMûiB[m2 pQHmKB[m2 HQ+H2φϵᅶԥϵ ԡVX V JQMi`2` [m2ᅦ ԊϯԈ ௳
ϣ΄ͩϬЏπμ
ԥϯ ԡ EԈX
#V 1M /û/mB`2 [m2 H +?`;2 KQv2MM2 bm` mM2 b2+iBQM /2 HǶû+QmH2K2Mi UHKBMB`2 Qm im`#mH2MiV bǶû+`Bi ӽ ԩ ԟ~ ᅶԖ ᅦԊϵ
Ԗ
+V *H+mH2` MmKû`B[m2K2Mi H2 +Q2{+B2Mi /2 *Q`BQHBb TQm` HǶû+QmH2K2Mi mMB7Q`K2 2i TQm` HǶû+QmH2K2Mi HKBMB`2 /2 SQBb2mBHH2X
/V .Mb H2 +b /2 `û;BK2b im`#mH2Mib +Qm`Mib- H2b pH2m`b /m +Q2{+B2Mi Qb+BHH2Mi 2Mi`2 R-y8 2i R-kyX *QKK2Mi2`X
AX"XkV _m;QbBiû- /B;`KK2 /2 JQQ/v
G T2`i2 /2 +?`;2 `û;mHBĕ`2 KQv2MM2- TQm` mM û+QmH2K2Mi BM+QKT`2bbB#H2 /Mb mM2 +QM/mBi2 +B`+mHB`2 `2+iBHB;M2 /2 HQM;m2m`ԁ2i /2 /BKĕi`2ӹ- 2bi /QMMû2 T`
~ӽև ԕ ॼԇր ᅾӹॽ ԁӹ ԊԖϵ
/û}MBbbMi BMbB H2 +Q2{+B2Mi /2 T2`i2 /2 +?`;2ԕ ԇր ᅾӹ[mB /ûT2M/ /m MQK#`2 /2 _2vMQH/bԇր- 2i T`
+QMbû[m2Mi /m `û;BK2 /Ƕû+QmH2K2Mi- 2i /2 H `m;QbBiû `2HiBp2 ᅾӹ/2 H +QM/mBi2X G pH2m` MmKû`B[m2 /2 +2 +Q2{+B2Mi 2bi /QMMû2 T` H2 /B;`KK2 /2 JQQ/v U};m`2 dV- 2M 7QM+iBQM /m MQK#`2 /2 _2vMQH/b- TQm`
/Bzû`2Mi2b pH2m`b /2 H `m;QbBiû `2HiBp2ᅾӹUHm2 ¨ /`QBi2 /m ;`T?2VX
G `m;QbBiû #bQHm2ᅾ H /BK2MbBQM /ǶmM2 ?mi2m` bMb iQmi27QBb `2T`ûb2Mi2` mM2 ?mi2m` KQv2MM2 /2b bTû`Biûb /2 H bm`7+2 BMiû`B2m`2 /2 H +QM/mBi2 , T` 2t2KTH2- TQm` /2b +QM/mBi2b KûiHHB[m2b `Bp2iû2b- H2 `2pāi2K2Mi T2m /ǶBKTQ`iM+2 /2pMi H2 MQK#`2 2i HǶû+`i2K2Mi /2b }H2b HQM;Bim/BMH2b 2i i`Mbp2`bH2b /2 `Bp2ibX V JQMi`2` [m2 HǶû+QmH2K2Mi /2 SQBb2mBHH2 +QM/mBi ¨ԕ ॼԇր ᅾӹॽ
ԇր
X
AMi2`T`ûi2` H2 7Bi [m2 H2 +Q2{+B2Mi /2 T2`i2 /2 +?`;2 BMbB Q#i2Mm M2 /ûT2M/ Tb /2 H `m;QbBiûX
#V SQm` `2HB2` H biiBQM /2 TQKT;2 m +?i2m /Ƕ2m- QM BMbiHH2 mM2 +QM/mBi2 2M 7QMi2 /2 /BKĕi`2ӹ DN- /2 HQM;m2m`ԁ LNX .Mb H2b +QM/BiBQMb MQKBMH2b /2 7QM+iBQMM2K2Mi- +2ii2 +QM/mBi2 /û#Bi2Ԇ -਼T·φ /Ƕ2mX G `m;QbBiû /2 H +QM/mBi2 2M 7QMi2 /ûT2M/ /2 bQM ûii /2 bm`7+2- b2HQM [mǶ2HH2 2bi M2mp2 Qm THmb Qm KQBMb +Q``Q/û2X PM /BbiBM;m2 i`QBb +b
ਲ 6R Ŀ 7QMi2 M2mp2 ŀ ,ᅾφ NNc ਲ 6k Ŀ 7QMi2 +Q``Q/û2 ŀ ,ᅾϵ NNc ਲ 6j Ŀ 7QMi2 /ûTQbû2 ŀ ,ᅾϯ NNX
1M miBHBbMi HǶ#[m2 /2 JQQ/v- ûpHm2` /Mb +?+mM /2 +2b +b H T2`i2 /2 +?`;2 KQv2MM2 ~ӽև/2 +2ii2 +QM/mBi2 /Mb b2b +QM/BiBQMb MQKBMH2b /ǶmiBHBbiBQM UԆ -਼T·φVX
AX"XjV S2`i2b bBM;mHBĕ`2b
G2b T2`i2b /2 +?`;2b bBM;mHBĕ`2b 2M `û;BK2 im`#mH2Mi T2mp2Mi bǶû+`B`2 bQmb H 7Q`K2
~ӽ֎ Ԁ ԊԖϵ
UT2`i2b T`QTQ`iBQMM2HH2b ¨ԀԆϵV- +2 [mB T`ûb2Mi2 mM BMiû`āi ûpB/2Mi TQm` H2 +mKmH /2b T2`i2b /2 +?`;2b TmBb[m2 HǶQM û+`Bi
~ӽև ԕ ॼԇր ᅾӹॽ ԁӹ ԊԖϵ
UT2`i2b `û;mHBĕ`2b T`QTQ`iBQMM2HH2b ¨ԁԆϵVX AH T2mi bǶ;B` /2 T2`i2b /Mb H2b `ûi`û+Bbb2K2Mib- H2b 2Mi`û2b- H2b ;`BHH2b- H2b /Bzmb2m`b- H2b pMM2b- H2b `Q#BM2ib- H2b +HT2ib- H2b +Qm/2b- 2i+X
SQm` mM2 +QM/mBi2 +vHBM/`B[m2 /2 /BKĕi`2ӹ DN2i iQm`MMi /2 Nyê p2+ mM `vQM /m +Qm/2 /2 R-8 K- QM m` mM +Q2{+B2MiԀ/2 y-kX Zm2HH2 2bi H HQM;m2m` /2 +QM/mBi2 2M Ŀ 7QMi2 M2mp2 ŀ û[mBpH2Mi2 ¨ +2 +Qm/2 \
§ iBi`2 /2 +QKT`BbQM- mM2 2Mi`û2 bBHHMi2 /2 +2 /BKĕi`2 mM +Q2{+B2MiԀ/2 HǶQ`/`2 /2 HǶmMBiû- mM2 pMM2
¨ Tbb;2 /B`2+i /2 y-R- mM `Q#BM2i ¨ bQmTT2 /2 e 2i mM +HT2i MiB@`2iQm` ¨ bQmTT2 /2 dy UbQBi mM2 HQM;m2m`
û[mBpH2Mi2 /2 H +QM/mBi2 T`û+û/2Mi2 /2 THmb /2 8yy KVX
AA SQBMi /2 7QM+iBQMM2K2Mi ?v/`mHB[m2 /ǶmM2 BMbiHHiBQM
AAX Ĝ *`+iû`BbiB[m2b ?v/`mHB[m2b /ǶmM2 TQKT2 +2Mi`B7m;2
lM2 TQKT2 +2Mi`B7m;2 2bi +`+iû`Bbû2 KBMBK T` i`QBb T`Kĕi`2b , bQM /û#Bi pQHmKB[m2 MQKBMHԆ- b ?m@
i2m` KMQKûi`B[m2 iQiH2 MQKBMH2ӽֈ֏[mB 2bi H p`BiBQM /2 ?mi2m` KMQKûi`B[m2 2M;2M/`û2 T` H TQKT2 Umbm2HH2K2Mi 2tT`BKû2 2M Kĕi`2 /2 +QHQMM2 /Ƕ2m , K*1V 2i bQM `2M/2K2Mi ?v/`mHB[m2 MQKBMHԇ ԅփԅֈ
Qɍԅփ2bi H TmBbbM+2 ?v/`mHB[m2 7Qm`MB2 T` H TQKT2 2iԅֈH TmBbbM+2 Kû+MB[m2 7Qm`MB2 ¨ H TQKT2X G2 +QMbi`m+i2m` 7Qm`MBi H2b +Qm`#2bӽֈ֏ Ԇ2iԇ ԆX PM /BbTQb2 U};m`2 kV /2 H +`+iû`BbiB[m2 ?v/`mHB[m2 /m ivT2 /2 TQKT2 `2i2Mm2 Uq.1 jkVX AH bǶ;Bi /ǶmM2 TQKT2 +2Mi`B7m;2 KmHiB@ûi;2b /QMi H2 7QM+iBQMM2K2Mi M2 b2`
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kyRe@yk@kj Rd,kd,jk S;2 3f3
10 310 410 510 610 710 8 10 −2 10−18 9 1.2 1.4 1.6 1.8 2 2.5 3 3.5 4 4.5 5 5.5 6 7 8 9
67823456782345678234567823456782345678 1e−005 2e−005 5e−005 0.0001 0.0002 0.0004 0.0006 0.0008 0.001 0.0015 0.002 0.003 0.004 0.006 0.008 0.01 0.0125 0.015 0.0175 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.06 0.07 Laminarflow Criticalzone Transition zoneComplete turbulence, rough pipes, R > 3500/r, 1/√f = 1.14 − 2 log r→→←←
Darcy−Weisbach friction factor f ! """"2hDg
LV 2
Moody Diagram r = 5e−006
r = 1e−006 Smooth pipes, r = 01/√f = 2 log(R√f ) − 0.8 Material""""""""""""""Riveted steelConcreteWood staveCast ironGalvanized ironAsphalted cast ironCommercial steelDrawn tubing Reynolds number R !"" (V in m/s, D in m, ν in m 2/s) VD ν
Relative roughness r ! " (ε in mm, D in mm) ε
D
Hagen−Poisseuille equationR ≤ 2300, f = 64/R
Colebrook equation, R ≥ 23001/√f = −2 log(r /3.7 + 2.51/(R√f ))
Acceleration at sea levellatitude 45°, g = 9.80665 m/s2 VD for water at 20°C (V in m/s, D in cm)0.06|| 0.1| 0.2| 0.4| 0.6| 0.8| 1| 2| 4| 6| 8| 10| 20| 40| 60|| 100| 200| 400| 600|| 1000| 2000| 4000| 6000|| 10000|____________________________________________________________________________________________________________________________________________________________________________________________________VD for atmospheric air at 20°C1|2|4|6|8|10|20|40|60||100|200|400|600||1000|2000|4000|6000||10000|20000|40000|60000||100000|
ε (mm)"""""""""0.9−90.3−30.18−0.90.250.150.120.0460.0015
Fluid at 20°C""""""""""""""WaterAir (101.325 kPa) ν (m2/s) """""""""1.003e−0061.511e−005
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