Results 221 to 230 of about 21,023 (266)
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Biosystems, 1989
The interrelations of physics and biology are discussed. It is shown that Darwin can be considered as one of the founders of the important field of contemporary physics called physics of dissipative structures or synergetics. The theories of gradual and punctual evolution are presented.
M V, Volkenstein, M A, Livshits
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The interrelations of physics and biology are discussed. It is shown that Darwin can be considered as one of the founders of the important field of contemporary physics called physics of dissipative structures or synergetics. The theories of gradual and punctual evolution are presented.
M V, Volkenstein, M A, Livshits
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Chaos: An Interdisciplinary Journal of Nonlinear Science, 2008
We propose and analyze a model of evolution of species based upon a general description of phenotypes in terms of a single quantifiable characteristic. In the model, species spontaneously arise as solitary waves whose members almost never mate with those in other species, according to the rules laid down.
Bees, M. A. +2 more
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We propose and analyze a model of evolution of species based upon a general description of phenotypes in terms of a single quantifiable characteristic. In the model, species spontaneously arise as solitary waves whose members almost never mate with those in other species, according to the rules laid down.
Bees, M. A. +2 more
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The Annals of Thoracic Surgery, 1997
Bifurcated anastomosis is a technique wherein geometrically tailored flaps of a vein graft are anastomosed to an arteriotomy in a vessel and its two branches. Although this technique may be useful for the surgical management of any diseased arterial bifurcation, it is particularly valuable in coronary endarterectomy or when complete revascularization ...
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Bifurcated anastomosis is a technique wherein geometrically tailored flaps of a vein graft are anastomosed to an arteriotomy in a vessel and its two branches. Although this technique may be useful for the surgical management of any diseased arterial bifurcation, it is particularly valuable in coronary endarterectomy or when complete revascularization ...
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2017
Within the design of technology, the notion of the user, and user-centered design, has become a guiding principal for creating successful products. However, the concept of “user” is a non-trivial notion. HCI has historically viewed “the user” as an abstract concept, that is to say, it has been a reductive definition.
Nicholas True +4 more
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Within the design of technology, the notion of the user, and user-centered design, has become a guiding principal for creating successful products. However, the concept of “user” is a non-trivial notion. HCI has historically viewed “the user” as an abstract concept, that is to say, it has been a reductive definition.
Nicholas True +4 more
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Periodically Perturbed Bifurcation—1. Simple Bifurcation
Studies in Applied Mathematics, 1980We consider the effect of a periodic perturbation on the bifurcation behavior of a system of differential equations. It is shown that constant solutions are modified into periodic solutions, and that the perturbations leads to the separation of solution branches.
Rosenblat, S., Cohen, Donald S.
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Control of the Hopf bifurcation in the Takens-Bogdanov bifurcation
2008 47th IEEE Conference on Decision and Control, 2008It is a well-known result that in a versal deformation of the Takens-Bogdanov bifurcation is possible to find dynamical systems that undergo saddle-node, homoclinic and Hopf bifurcations. In this document a nonlinear control system in the plane is considered, whose nominal vector field undergoes the Takens-Bogdanov bifurcation, and then the idea is to ...
Francisco Armando Carrillo Navarro +1 more
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1999
Abstract The solutions are real for λ 3 and λ 1, and complex for 3 < λ < 1. The graphs of Re(m1) and Re(m2) against λ are shown in Figure 12.1. Noting the signs of m1 and m2, we can observe that the equilibrium point at the origin is: A bifurcation occurs at the parametric value λ 1 where, as λ increases, the equilibrium ...
D W Jordan, P Smith
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Abstract The solutions are real for λ 3 and λ 1, and complex for 3 < λ < 1. The graphs of Re(m1) and Re(m2) against λ are shown in Figure 12.1. Noting the signs of m1 and m2, we can observe that the equilibrium point at the origin is: A bifurcation occurs at the parametric value λ 1 where, as λ increases, the equilibrium ...
D W Jordan, P Smith
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Periodically Perturbed Bifurcation. II. Hopf Bifurcation
Studies in Applied Mathematics, 1981We consider the effect of a periodic perturbation on the bifurcation behavior of a system of differential equations. It is shown that periodic solutions are, in general, modified into quasiperiodic solutions. Different phenomena are encountered in resonance and near‐resonance conditions, leading in some cases to separation of solution branches and in ...
Rosenblat, S., Cohen, Donald S.
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To Bifurcate or Not To Bifurcate? That is the (Ambiguous) Question
Arbitration International, 2013Commentators and practitioners hold different views about ‘bifurcation’, i.e. the procedural technique of splitting the arbitral proceedings in distinct phases with a view of reaching decisions on discrete matters. The discussion mostly focuses on whether bifurcation is a source of efficiency or rather of useless additional costs and delays.
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Border-collision bifurcations: An explanation for observed bifurcation phenomena
Physical Review E, 1994Recently physical and computer experiments involving systems describable by continuous maps that are nondifferentiable on some surface in phase space have revealed novel bifurcation phenomena. These phenomena are part of a rich new class of bifurcations which we call border-collision bifurcations.
Nusse, Helena E. +2 more
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