Where are the dolphins?

Interest in extraterrestrial life has tended to focus on a search for extrasolar planets similar to the Earth. But what of forms of intelligent life that are very different from those found on Earth? Some features of life will not be peculiar to our planet, and alien life will resemble ours in such universals. But if intelligent, non-humanoid aliens exist, where might they be? Would they wish to visit Earth and would we know if they did?     

Where do flare ribbons stop?

The standard flare model,which was proposed based on observations and magnetohydrodynamic theory,can successfully explain many observational features of solar flares.However,this model is just a framework,with many details awaiting to be filled in, including how reconnection is triggered.In this paper,we address an unanswered question:where do flare ribbons stop?With the data analysis of the 2003 May 29 flare event,we tentatively confirmed our conjecture that flare ribbons finally stop at the intersection of separatrices(or quasi-separatrix layer in a general case)with the solar surface.Once verified,such a conjecture can be used to predict the final size and even the lifetime of solar flares.     

Welcome contributions from all over the world

Tsinghua Science and Technology （Tsinghua Sci Technol）, a comprehensive academic journal sponsored by Tsinghua University, is published bimonthly. This journal aims at presenting the up-to-date scientific achievements with high creativity and great significance in various engineering fields and in mathematical sciences, life sciences, chemistry, physics, etc. Contributions within the above scope all over the world are welcome.     

Welcome contributions from all over the world

Tsinghua Science and Technology (Tsinghua Sci Technol), a comprehensive academic journal sponsored byTsinghua University, is published bimonthly. This journal aims at presenting the up-to-date scientific achieve-ments with high creativity and great signif…     

Welcome contributions from all over the world

Tsinghua Science and Technology (Tsinghua Sci Technol), a comprehensive academic journal sponsored by Tsinghua University, is published bimonthly. This journal aims at presenting the up-to-date scientific achievements with high creativity and great significance in various engineering fields and in mathematical sciences, life sciences, chemistry, physics, etc. Contributions within the above scope all over the world are welcome. Tsinghua Sci Technol has an excellent editorial committee inclu…     

The Syntax of the Finite Verb ＂have＂

The author investigates the phenomenon of head movement, taking the finite verb have in some varieties of English as an example. Moreover, the author describes the importance of adjacency and head movement constraint, and makes an in -depth analysis of this language phenomenon.