منابع مشابه
Lost tongues
The latest issue of the United Nations Educational, Scientific and Cultural Organisation (Unesco) atlas on the status of the world's languages finds threats to a growing number as a handful of languages dominate an increasingly 'globalised' world but policy towards languages can have a major effect on survival prospects. In one extreme example of the threatened status of some languages, Unesco ...
متن کاملNative Tongues, Lost and Found: Resources and Empirical Evaluations in Native Language Identification
In this paper we present work on the task of Native Language Identification (NLI). We present an alternative corpus to the ICLE which has been used in most work up until now. We believe that our corpus, TOEFL11, is more suitable for the task of NLI and will allow researchers to better compare systems and results. We show that many of the features that have been commonly used in this task genera...
متن کاملWhy snakes have forked tongues.
The serpent's forked tongue has intrigued humankind for millennia, but its function has remained obscure. Theory, anatomy, neural circuitry, function, and behavior now support a hypothesis of the forked tongue as a chemosensory edge detector used to follow pheromone trails of prey and conspecifics. The ability to sample simultaneously two points along a chemical gradient provides the basis for ...
متن کاملDisappearance of Resonance Tongues
where ai(t) = Pi + εQi cos2t, where Pi,Qi and ε are given constants, and where it is assumed that when ε=0 this system exhibits a pair of linearly independent solutions of period 2π . Since the driver cos2t has period π , we have the ingredients for a 2:1 subharmonic resonance which typically results in a tongue of instability involving unbounded solutions when ε >0. We present conditions on th...
متن کاملGeometry of resonance tongues
Resonance tongues arise in bifurcations of discrete or continuous dynamical systems undergoing bifurcations of a fixed point or an equilibrium satisfying certain resonance conditions. They occur in several different contexts, depending, for example, on whether the dynamics is dissipative, conservative, or reversible. Generally, resonance tongues are domains in parameter space, with periodic dyn...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2009
ISSN: 0960-9822
DOI: 10.1016/j.cub.2009.03.008