منابع مشابه
Evolution: Taking Wing with Weak Feathers
Scientists long thought they knew what the wings of early birds looked like. But new reconstructions of Archaeopteryx and its kin suggest quite different feather arrangements on their wings with profound implications for the evolution of flight.
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Scientists present talks all the time. The talk is one of the main tools of our trade. Some people give so many you wonder how they fit in experiments at all. Lab heads give seminars and conference speeches to sell their work to the world, and to attract the best people to work for them. Aspiring lab heads give job talks to sell themselves to potential employers. Nearly everyone gives talks so ...
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Visual attributes are human-nameable semantic properties. They are the adjectives of the visual recognition world, capturing anything from material properties (”metallic”, ”furry”), shapes (”flat”, ”boxy”), expressions (”smiling”, ”surprised”), to functions (”sittable”, ”drinkable”). An attribute may be a binary predicate (”shiny”) or a relative comparison (”shinier than”). Many promising appli...
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In birds and other vertebrates, most acoustic signals are produced pneumatically by moving air through a vocal apparatus. Here we describe a unique mechanism used to produce a tonal acoustic signal in vertebrates. Video recordings of the courtship displays of male Club-winged Manakins, Machaeropterus deliciosus, reveal that males produce sustained harmonic tones through interactions among oscil...
متن کاملModeling the Structure of Feathers
We present a parametric model for feather modeling in computer graphics. The model is based on Bézier curves and allows easy generation of many feather structures through manipulation of the parameters.
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ژورنال
عنوان ژورنال: Journal of Graduate Medical Education
سال: 2020
ISSN: 1949-8349,1949-8357
DOI: 10.4300/jgme-d-19-00388.1