نتایج جستجو برای: bifurcation points
تعداد نتایج: 283885 فیلتر نتایج به سال:
In two-parameter systems two symmetry breaking bi-furcation points of diierent types coalesce generically within one point. This causes secondary bifurcation points to exist. The aim of this paper is to understand this phenomenon with group theory and the innerconnectivity of irreducible representations of super-group and subgroups. Colored pictures of examples are included.
The formation of self-organized patterns in predator-prey models has been a very hot topic recently. The dynamics of these models, bifurcations and pattern formations are so complex that studies are urgently needed. In this research, we transformed a continuous predator-prey model with Lesie-Gower functional response into a discrete model. Fixed points and stability analyses were studied. Aroun...
In this paper, the effect of a hunting cooperation functional response in discrete predator-prey model is first to be studied. By surveying existence conditions and stability fixed points, preliminary foundation for bifurcation analysis provided. Then, flip nonhyperbolic points investigated, theoretical explanation our results from biological perspective presented.
Wind-induced vegetation patterns were proposed a long time ago but only recently a dynamic vegetation-sand relationship has been established. In this research, we transformed the continuous vegetation-sand model into a discrete model. Fixed points and stability analyses were then studied. Bifurcation analyses are done around the fixed point, including Neimark-Sacker and Turing bifurcation. Then...
BACKGROUND In a number of coronary bifurcation lesions, both the main vessel and the side branch need stent coverage. Using sirolimus eluting stents, we compared 2 dedicated bifurcation stent techniques, the crush and the culotte techniques in a randomized trial with separate clinical and angiographic end-points. METHODS AND RESULTS A total of 424 patients with a bifurcation lesion were rando...
The dynamic of a large class of power systems can be represented by parameter dependent differential-algebraic models of the form ) , , ( p y x f x = • and ) , , ( 0 p y x g = . When the parameter p of the system (such as load of the system) changes, the stable equilibrium points may lose its dynamic stability at local bifurcation points. The systems will lose its stability at the feasibility b...
The response of a neuron to repeated somatic fluctuating current injections in vitro can elicit a reliable and precisely timed sequence of action potentials. The set of responses obtained across trials can also be interpreted as the response of an ensemble of similar neurons receiving the same input, with the precise spike times representing synchronous volleys that would be effective in drivin...
The aim of this study was to evaluate the blood vascular network of the retina and its regions in diabetic patients with and without signs of mild early diabetic retinopathy by using number of bifurcation points, fractal and multifractal methods. We used 33 segmented images of retinographies, 28 corresponding to the retinographies that did not show any sign of diabetic retinopathy and 5 diagnos...
In this manuscript, Local dynamic behaviors including stability and Hopf bifurcation of a new four-dimensional quadratic autonomous system are studied both analytically numerically. Determining conditions equilibrium points on different parameters derived. Next, the investigated by using Routh-Hurwitz criterion theory, respectively. It is found that initial point supercritical in system. The th...
Cancelable biometrics is a good approach to address the security and privacy concerns on biometric authentication. The security of cancelable biometrics lies on non invertibility of the transformed templates. So the transforms should be noninvertible and the original biometric template cannot be recovered. Our proposed method initially involves segmentation process to identify blood vessel bifu...
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