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ңӢﻹд2006ָ壬еλļλĶĵͬ
¡ڱ֤ݣԲοϡĲͣ۶˳ֽɻ
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ʱ䣺2008-03-29 11:57:38.0 ֽ3107

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Ҫ̫˵֪ʶҪϧԼë˵ֻ֣
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ա:	2008-12-18 09:35:07
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ռ:	"ݳ" <rctz@eyou.com>, "ݳ" <rctz@sohu.com>  [
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:		ֽɻ.doc(116.49K)
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һƬС˵˵ˣ֪˭,ܲ,ҵʧְ.ÿĶ
̫,ܶ.
ƬС˵дд,Ҷ.ȻҵĴ
,ҪЦŶ

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

пԺļͥPI

ߣbigfenqing

пԺ÷оԱ20046ѡпԺ˼ƻ
200710»صѡ߲ûǰԭоƻҲû
ҵоְλȫְļͥ2008һлصʱ
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20094÷2ɡ˼ƻڿˣڿ
ʾ2깲5ġ˼ƻִڼ䣬ֻһƪһߵ
(Oncogene, 2007)2ƪǵһͨѶߵ(Methods, 2006; Human 
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PI

http://www.big.ac.cn/big/master/tutor.jsp?id=25

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

ʵʵ˵Ժ°ֵһӡ

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˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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ȷڡѧ2002ꡢ385ڡ507~511ҳϵġDD2
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ƪģ1767-1782ҳ1753-1766ҳУҪͼ2ͼ3ͼ
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ͶڡActa Materialia50(2002)315-325ϣĿ
Development of microstructures in laser surface remelting DD2 single 
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2. Sen Yang, Weidong Huang, Wenjin Liu, Minlin Zhong, Yaohe Zhou: 
Development of microstructures in laser surface remelting DD2 single 
crystalActa Materialia 50(2002)315-325

Ϯԭӡ

1. S.A. David, J.M. Vitek, M. Rappaz, L.A. Boatner: Microstructure 
of Stainless Steel Single-Crystal Electron Beam Welds, Metallurgical 
Transactions A, 21A(1990)6: 1753-1766

2. M. Rappaz, S.A. David, J.M. Vitek, L.A. Boatner: Analysis of 
Solidification microstructures in Fe-Ni-Cr Single-Crystal Welds , 
Metallurgical Transactions A, 21A(1990)6:1767-1782

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

Ӱμ
ǡȤĹ͡(XYS20070517)
ѧ˿¹ģϮƸá(XYS20071104)

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(XYS20090530)

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ʱǰֶĨˣغôǲĨġȤĿȥ
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㼸˳ö֮ġԺʿʵֻЩռ
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˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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ԡᰮѧ˵ѧȡôõĳɾͣһҲһ
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ĻWYZֻԺٻ
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ðѱĳɡᰮˡߡᰮŪǷǡת͸һ
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Ҫ˵ǣʦܻΪҵĻظңң
ʵҡһŽܽŶӣܿܲٻظΪ򼵶ʶ
⹥ʦżټ

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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ֵرMellor(2003)˵·ϳ֣ϲ㺣ϲ
ֵһƣڸö²Ҫľһ͵о


(2) Fangli Qiao, Yongzeng Yang, Changshui Xia and Yeli Yuan, 2008. 
The role of surface waves in the ocean mixed layer. Acta Oceanologica 
Sinica, 27(3):30-37.

Following a totally different approachsome investigators(Mellor 
and Blumberg2004Mellor2003Burchard and Karsten2001Stacey
1999 Terray et al1996Craig and Banner1994)have studied the 
contribution of surface waves to oceanic mixing and on wave-current 
interaction theoriesWhile these studies have shown some improvement 
in simulated MLSST and surface currentsthe surface wave effects 
are mostly limited to the top few meters without sufficient vertical 
penetration To represent the vertieal distribution of the wave 
effects in the three dimensional ocean circulation models is a 
difficult problemyet it is essential in resolving the mismatch of 
scales between the wave and current motionsThis dificulty was 
partially solved recently by Mellor(2003)who derived a set of 
three-dimensional wave-current interaction equations, with the joint 
production of turbulence by currents and wave interactions rather than 
acting separatelyAs promising as this new approach appearedthe new 
turbu1enee production term was left as a future task In this note
we report the results of precisely such an effort

ΪʲôҪרҵˡʵԹרҵĶȴ
һĿأѵͨѶԱһͲ໥
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(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

ӰصģֲѪѪͲ첻̥ܶκ
Ӱ죬ȻҩǹڲҽԺҽƭΪƭ
Ǯαѧڻڼҩп̥̥ܶ
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(XYS20090530)

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ʳﲻҩ

ߣҲ

ʳƸˣرйгţáܶʳƷӡĳ
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ԽʳƷʳѪǣѪѹ̴׹ߣ߼
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(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

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С᣺ҽѧԺ28λҪѧͷ격г35񽱿гɹ


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2009.05.27հ㿪ǵҳǶʱġжȡԼ
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ѧάǲμϢѧѧԺѧϰʵѧչۻ 
...2009-05-27 

Ͽѧѧϰʵѧչۻ֪ͨ (2009-05-27) 

һ˿οżϧ

ˡ𾪡ǣҲУררҲͷͷȫ
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(XYS20090530)

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ڡѧҵʹ߿ ʡݸ߿١Ŀ

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Ϲɡ˵ʲôԪΨ߿Ǵӡ

ȻҲͬ߿Ψһ·ڴ˻̸λΪ߿½
Ǻµʦ߹⣺

һһĸһͨĴѧӦƸͬһݹ
ʱǻѡ˭

ڶԪôԪڹҺиṩʲô
ԪչĻ᣿

ڵĸбҵ඼ʮ߰ңΪ90ܸĸ谮
ĺӣѧĥô˲Ӧ⸴ӵ᣿

ģ˵㣬˵Щ˴վ˵ۣǻǵ
ӷ߿

壬λΪ߿ٽкõʦǿˡѧԭ
ʲôѧҵѡԸ߿𣿣ҶǱεģ
ǻһ˵

Ըʦԣ⵱ȻǺˣҴӸйľ飬ʱ
ЩʦȰ˵ɼǺܺõѧǻؼȥɣڴѧҲ
ҵҲϣ㿼ϣҲҲȥɣǣѧУ
ѧʾȥˡʸλʦҲǵ˼˰ɣ

ߣǾЩѧȥʲôԼȤ߳һɹ
֮·ѧоˣȥʲôе
Ըٵ飬ЩûвμӸ߿ȥʲôˡ

ڼʶˣй۾˵ϹڵĶܸ㽲ɰ׵ġ
ؿѧΪһѧĻʥأۣҲ
ΪţǼʶˣнһѧдĲⷽǱԩ
𣿡һĵĲģԼвĻƶûŪҲȥ
ˣҲܱƵƼǼʶѧˮƽˡ

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

桶ѰһĲϵֱӷӢĿ

ߣWolfgang

    ڹĶ˿µϣڼͬѧݸһһڵ
Physics Today³棩־ڷУżȻеһƪ
The detection and characterization of exoplanetsո˿϶
ĳġѰֶо˵ơ

    Physics TodayϵAmerican Institute of Physicsıѧ½
չ־һڣThe detection and characterization of 
exoplanetswww.physicstoday.orgҳͷƽ飬Ҳͨ
Ķȫģ

http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_62/iss_5/46_1.shtml

    Ӣԭıǿ£ߵ˵ǻĿбд
ɣҪ˼ֹ۲ǵķ͸ַص㡣ȻĿ
ǻҪڽǹ۲ķӢԭĵĸ±
ֱǣDoppler spectroscopyMicrolensingTransitsAstrometry
Direct detectionComparing techniquesĸνܵĹ۲ֱⷽǣ
ֱӹ۲ⷨЧӦ͸Ƿǲֶ
ӢԭĺͳµıȽϣ

    1ӢԭģThe amplitude of the Doppler oscillation caused by 
a planet of given mass and orbital radius depends on the orientation 
of its orbital plane relative to the observer, which is not generally 
known. ... Therefore the technique generally yields only a lower limit 
to the perturbing planets mass

    ģΪ޴֪ϵƽļнǣֻ
ޡ

    2ӢԭģA key requirement for Doppler detection is 
observation of the star for at least one full orbit period. Thats 
why the earliest discoveries were of giant planets in very close 
proximity to their parent stars.

    ģַҪһܹתȷֵĶǴͷ
ǽϽתڽ϶̣ǡ

    3ӢԭģBy now, the statistics for stars scrutinized in 
Doppler surveys show that at least 15% of Sun-like stars have 
gas-giant planets with orbital periods shorter than 10 years, 

    ģͳƱ15%̫ĺϵִͷҹת
Сʮǡ

    4Ӣԭģ But as time has gone by, the method has unveiled 
planets of lesser mass and greater orbital distance.

    ģŹ۲ݵĻۺ͹۲⾫ȵߣĳתںС
ͷǽᱻ֡

    5ӢԭģThe same stellar reflex motion that gives the 
radial-velocity Doppler signatures also gives rise to astrometric 
signatureslooping motions across the celestial plane normal to the 
line of sight. Astrometry is the measurement of stellar positions on 
the celestial sphere. Conclusions from the astrometric data do not 
suffer the planet-mass ambiguity associated with Doppler oscillations. 
Combining astrometry with Doppler data yields unambiguous and precise 
orbital parameters that can confirm the presence of Earth-mass planets 
and something of their dynamical history. 

    ģͨȷеλƶΧ
˶ԺǴֱڹ۲ⷽ˶УÿֲЧӦֻ
ƽڹ۲ⷽ˶еĲ㡣ַʹþͿԻĺ
µά˶Ӷ߶Ƶ׼ȷȡ

    6Ӣԭ;  Instead the source stars image appears 
temporarily magnified, its brightness waxing and waning as the lens 
star traverses the line of sight 

    ģ˵ϵͨʱǻ۲⵽Ĺ
ǿȱǿٱϵиͷСǾͻĹǿ仯
²һϿٱ仯С塣

    7ӢԭģThats the goal of NASAs Kepler mission, 
launched on 7 March. 

    ģ3·ֳɹĿ̫ԶΪĿ
ġ

    µƪͷʱддοˡThe detection 
and characterization of exoplanetsһģһг
ֱӷ룬һûгòɢȷӢԭݡ
Ϊԭߵݷֱӷݵ²ףӦ
гο׻ָԭĳԺδӢԭ

(XYS20090530)

˿(www.xys.org)(xys3.dxiong.com)(www.xysforum.org)(xys2.dropin.org)

ӵġֶڷż֪ͨи

ߣ

߳Ժ,ֹڵķżٻҪ֪ͨȷʵе㲻˼.

¼µĹȫд,úɫԱ, һ
ڶ,

,ǾǽһȻΪ.
һʱܸλһ.ɹҷʲô֪ͨ˾
Ǽ.,ûյʲôż֪ͨ.

ǰѼڸ߹,ÿ˶гֵʱ滮Լļ.

(XYS20090530)

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