« Herds and flocks », in : E. Yarshater, ed., EIr. XI, New York, Encyclopaedia Iranica Foundation, (2003), pp. 230-232.
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Expedition Medicine (Revised Edition), D. Warrell and S. Anderson, eds. New York, Fitzroy Dearborn, 2003. 398 pp, hardbound. Price: $55.
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The aggregate motion of a flock of birds, a herd of land animals, or a school of fish is a beautiful and familiar part of the natural world. But this type of complex motion is rarely seen in computer animation. This paper explores an approach based on simulation as an alternative to scripting the paths of each bird individually. The simulated flock is an elaboration of a particle system, with t...
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Let F be a flock of the quadratic cone Q: X 2=X1X3 , in PG(3, q), q even, and let 6t : X0 =xt X1 + t X2 +zt X3 , t # Fq , be the q planes defining the flock F. A flock is equivalent to a herd of ovals in PG(2, q), q even, and to a flock generalized quadrangle of order (q, q). We show that if the herd contains a monomial oval, this oval is the Segre oval. This implies a result on the existence o...
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We present a quantitative continuum theory of ‘‘flocking’’: the collective coherent motion of large numbers of self-propelled organisms. In agreement with everyday experience, our model predicts the existence of an ‘‘ordered phase’’ of flocks, in which all members of even an arbitrarily large flock move together with the same mean velocity ^vW &Þ0. This coherent motion of the flock is an exampl...
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ژورنال
عنوان ژورنال: Abstracta Iranica
سال: 2005
ISSN: 0240-8910,1961-960X
DOI: 10.4000/abstractairanica.890