| 查看: 1703 | 回复: 17 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
sagaman木虫 (著名写手)
|
[交流]
南大新出两篇Science文章
|
||
|
Research Articles 封面文章 A Swimming Mammaliaform from the Middle Jurassic and Ecomorphological Diversification of Early Mammals Qiang Ji,1,3 Zhe-Xi Luo,2,1* Chong-Xi Yuan,3 Alan R. Tabrum2 A docodontan mammaliaform from the Middle Jurassic of China possesses swimming and burrowing skeletal adaptations and some dental features for aquatic feeding. It is the most primitive taxon in the mammalian lineage known to have fur and has a broad, flattened, partly scaly tail analogous to that of modern beavers. We infer that docodontans were semiaquatic, convergent to the modern platypus and many Cenozoic placentals. This fossil demonstrates that some mammaliaforms, or proximal relatives to modern mammals, developed diverse locomotory and feeding adaptations and were ecomorphologically different from the majority of generalized small terrestrial Mesozoic mammalian insectivores. 1 Department of Earth Science, Nanjing University, Nanjing 200017, China. 2 Carnegie Museum of Natural History, Pittsburgh, PA 15213, USA. 3 Chinese Academy of Geological Sciences, Beijing 100037, China. * To whom correspondence should be addressed. E-mail: LuoZ@CarnegieMNH.org Reports X-ray Flares from Postmerger Millisecond Pulsars Z. G. Dai,1* X. Y. Wang,1 X. F. Wu,2 B. Zhang3 Recent observations support the suggestion that short-duration gamma-ray bursts are produced by compact star mergers. The x-ray flares discovered in two short gamma-ray bursts last much longer than the previously proposed postmerger energy-release time scales. Here, we show that they can be produced by differentially rotating, millisecond pulsars after the mergers of binary neutron stars. The differential rotation leads to windup of interior poloidal magnetic fields and the resulting toroidal fields are strong enough to float up and break through the stellar surface. Magnetic reconnection–driven explosive events then occur, leading to multiple x-ray flares minutes after the original gamma-ray burst. 1 Department of Astronomy, Nanjing University, Nanjing 210093, China. 2 Purple Mountain Observatory and Joint Center for Particle Nuclear Physics and Cosmology of Purple Mountain Observatory–Nanjing University, Chinese Academy of Sciences, Nanjing 210008, China. 3 Department of Physics, University of Nevada, Las Vegas, NV 89154, USA. * To whom correspondence should be addressed. E-mail: dzg@nju.edu.cn |
回复此楼» 猜你喜欢
070300化学279求调剂
已经有14人回复
-
286求调剂
已经有18人回复
-
一志愿0807 数一英一 313 有没有二轮调剂
已经有9人回复
-
0860004 求调剂 309分
已经有5人回复
-
有爆料，一个青年教师卖房得400万，然后换了一个四青帽子
已经有6人回复
-
求调剂｜086000生物与医药调剂
已经有3人回复
-
299求调剂
已经有4人回复
-
一志愿鲁东大学071000生物学学硕初试分数276求调剂
已经有6人回复
-
0860004 求调剂 309分
已经有3人回复
-
278求调剂
已经有25人回复
笨笨鸟
荣誉版主 (知名作家)
good good study, day day up
- 应助: 0 (幼儿园)
- 贵宾: 14.5
- 金币: 4277.2
- 帖子: 9961
- 在线: 2.9小时
- 虫号: 73271
- 注册: 2005-06-06
5楼2007-03-13 00:48:56
photonic
铁杆木虫 (著名写手)
- 应助: 8 (幼儿园)
- 金币: 7643.5
- 散金: 100
- 红花: 4
- 帖子: 1386
- 在线: 130.2小时
- 虫号: 91218
- 注册: 2005-09-04
- 性别: GG
- 专业: 光学
2楼2006-02-26 14:42:05
sagaman
木虫 (著名写手)
- 应助: 0 (幼儿园)
- 金币: 3893.4
- 散金: 50
- 红花: 2
- 帖子: 1509
- 在线: 246.1小时
- 虫号: 120048
- 注册: 2005-11-28
- 性别: GG
- 专业: 半导体材料
3楼2006-02-26 14:42:51
6楼2007-03-13 19:31:41
