نتایج جستجو برای: frozen orbits
تعداد نتایج: 46282 فیلتر نتایج به سال:
The problem of relative motion control for spacecraft formation flying in eccentric orbits is considered in this paper. Due to the presence of nonlinear dynamics and external disturbances, a robust fuzzy sliding mode controller is developed. The slopes of sliding surfaces of the conventional sliding mode controller are tuned according to error states using a fuzzy logic and reach the pre-define...
مقدمه: تشخیص حین عمل جراحی به روش frozen section و تعیین نوع ضایعه، اهمیت به سزایی در تصمیم گیری نوع و وسعت عمل جراحی و کاهش تعداد اعمال جراحی در برخی از توده های پستان و تخمدان دارد. مطالعه ی حاضر با هدف تعیین میزان مطابقت بین تشخیص frozen section و برش های دایمی در توده های پستان و تخمدان انجام شد. روش ها: طی یک مطالعه ی مقطعی، 153 نمونه ی frozen section حین عمل جراحی توده های پستان و تخمدان ...
The orbital evolution of about 26,000 Jupiter-crossing objects and 1,500 resonant asteroids under the gravitational influence of planets was investigated. The rate of their collisions with terrestrial planets was estimated by computing the probabilities of collisions based on random-phase approximations and the orbital elements sampled with a 500 yr step. The Bulirsh-Stoer and a symplectic orbi...
This paper explores orbits in extended mass distributions and develops an analytic approximation scheme based on epicycloids (spirograph patterns). We focus on the Hernquist potential ψ = 1/(1 + ξ), which provides a good model for many astrophysical systems, including elliptical galaxies (with an R law), dark matter halos (where N-body simulations indicate a nearly universal density profile), a...
Period-doubling cascades are among the most prominent features of many smooth one-parameter families of maps, F : R×M → M, where M is a locally compact manifold without boundary, typically R . In particular, we investigate F (μ, ·) for μ ∈ J = [μ1, μ2], when F (μ1, ·) has only finitely many periodic orbits while F (μ2, ·) has exponential growth of the number of periodic orbits as a function of ...
A new fully numerical method is presented which employs multiple Poincaré sections to find quasiperiodic orbits of the Restricted Three-Body Problem (RTBP). The main advantages of this method are the small overhead cost of programming and very fast execution times, robust behavior near chaotic regions that leads to full convergence for given family of quasiperiodic orbits and the minimal memory...
Let G be a complex reductive group. We study the problem of associating Dixmier algebras to nilpotent (co)adjoint orbits of G, or, more generally, to orbit data for G. If g = 0 + n + in is a triangular decomposition of g and 0 is a nilpotent orbit, we consider the irreducible components of 0 n n, which are Lagrangian subvarieties of 0. The main idea is to construct, starting with certain "good"...
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