منابع مشابه
Feathered dinosaurs, flying dinosaurs, crown dinosaurs, and the name “Aves”
The taxon name “Aves” is currently used for several different clades, a situation that violates the fundamental nomenclatural principle that, to minimize ambiguity, each taxon name should refer to a single taxon. To clarify this situation, we explore some general issues concerning the properties of the three classes of phylogenetic definitions, including: how names can be tied to clades through...
متن کاملRoute Finding in Street Maps by Computers and People
We wrote a computer program which gives driving directions in northern New Jersey. Its data base combines a street map and a telephone book, so requests like “give directions from the Lackawanna Diner to the nearest dry cleaner’* (properly specified) can be answered. This problem involves both human factors and algorithmic problems. From the human factors standpoint, what kind of route is best:...
متن کاملDinosaurs
How have anoles evolved such diverse morphologies? This is an exciting time in anole biology because recently the genome of the green anole, Anolis carolinensis, was completely sequenced (http://www.broad.mit. edu/models/anole/). The completion of an anole genome opened a new avenue of research into the genetic changes that accompany adaptive radiation. Researchers would like to know how many, ...
متن کاملon semihypergroups and hypergroups
in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...
15 صفحه اولDinosaurs, Robots and Tails
Modern birds are derived from a group of carnivorous bipedal dinosaurs known as theropods, with which they share many morphological characteristics [1-7]. For this reason cursorial birds have been widely used as models for understanding the locomotion of their non-avian ancestors (non avian theropods) [8-11]. In our research we have demonstrated that chickens grown with artificial tails exhibit...
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ژورنال
عنوان ژورنال: Computers in Physics
سال: 1993
ISSN: 0894-1866
DOI: 10.1063/1.4823204