Boundedness and Dissipativity of Truncated Rotations on Uniform Planar Lattices

The finiteness of computer arithmetic can lead to some dramatic differences between the behaviour of a continuous dynamical system and a computer simulation. A thorough rigorous theoretical analysis of what may or what does happen is usually extremely difficult and to date little has been done even in relatively simple contexts. The comparative behaviour of a rotation mapping in the plane and on a uniform lattice in the plane is one such example. Simulations show that the rounding operator applied to a planar rotation mapping more or less preserves the qualitative behaviour of the original mapping, whereas the application of the truncation operator to a planar rotation can lead to quite different dynamical features. In this paper a theoretical justification of the properties of the planar rotation mappings under truncation to a, uniform integer lattice is provided, in particular properties of boundedness and dissipativity are investigated.     

Boundedness of Marcinkiewicz integrals and their commutators in H~1(R~n×R~m)

The authors establish the boundedness of Marcinkiewicz integrals from the Hardy space H1(Rn×Rm) to the Lebesgue space L1(Rn×Rm) and their commutators with Lipschitz functions from the Hardy space H1(Rn×Rm) to the Lebesgue space Lq(Rn×Rm) for some q>1     

UNIFORM BOUNDEDNESS AND UNIFORM STABILITY OF A KIND OF DELAY──DIFFERENTIAL EQUATIONS

ＵＮＩＦＯＲＭＢＯＵＮＤＥＤＮＥＳＳＡＮＤＵＮＩＦＯＲＭＳＴＡＢＩＬＩＴＹＯＦＡＫＩＮＤＯＦＤＥＬＡＹ──ＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳ￥ＺｈｅｎｇＢｕｎａｎ（ＧｕａｎｇｘｉＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：Ｔｈｉｓｐａ...     

各向异性Sobolev空间中拟线性椭圆型方程解的局部有界性

本文在很一般的结构条件下，证明了各向异性Ｓｏｂｏｌｅｖ空间中的拟线性椭圆方程解的局部有界性。     

A uniform boundedness theorem for locally convex cones

We prove a uniform boundedness theorem for families of linear operators on ordered cones. Using the concept of locally convex cones we introduce the notions of barreled cones and of weak cone-completeness. Our main result, though no straightforward generalization of the classical case, implies the Uniform Boundedness Theorem for Fréchet spaces.

     

Exponential boundedness of solutions for impulsive delay differential equations

For an impulsive delay differential equation

exponent estimates of solutions have been obtained.     

ON THE BOUNDEDNESS OF A CERTAIN SYSTEM OF FIFTH-ORDER DIFFERENTIAL EQUATION

１ＩｎｔｒｏｄｕｃｔｉｏｎＷｅｓｈａｌｂｅｃｏｎｃｅｒｎｅｄｈｅｒｅｗｉｔｈｒｅａｌｆｉｆｔｈｏｒｄｅｒｖｅｃｔｏｒｄｉｆｅｒｅｎｔｉａｌｅｑｕａｔｉｏｎｏｆｔｈｅｆｏｒｍ：Ｘ（５）＋Ｆ（Ｘ．．）Ｘ（４）＋Φ（Ｘ．．）＋Ｇ（Ｘ．．）＋Ｈ（Ｘ．）＋Ψ...     

一类三次kolmogorov系统的极限环

本研究一类三次kolmogorov系统解的定性行为，给出了系统解的有界性与极限环存在性的充分条件。     

The space localization of unbounded boundary perturbations in nonlinear heat conduction with transfer

We consider the nonlinear parabolic equation u_t = (k(u)u_x)_x + b(u)_x, where u = u(x, t, x ε R¹, t > 0; k(u) ≥ 0, b(u) ≥ 0 are continuous functions as u ≥ 0, b (0) = 0; k, b > 0 as u > 0. At t = 0 nonnegative, continuous and bounded initial value is prescribed. The boundary condition u(0, t) = Ψ(t) is supposed to be unbounded as t → +∞. In this paper, sufficient conditions for space localization of unbounded boundary perturbations are found. For instance, we show that nonlinear equation u_t = (uⁿu_x)_x + (u^β)_x, n ≥ 0, β >; n + 1, exhibits the phenomenon of “inner boundedness,” for arbitrary unbounded boundary perturbations.     

一类泛函微分方程周期解的存在性与应用

本文给出了一类滞后型泛函微分方程有一个周期解的四个充分性定理，其结果明显地优于著名的Ｙｏｓｈｉｚａｗａ周期解定理，最后给出了应用实例。