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51.
Paolo Musolino 《Mathematical Methods in the Applied Sciences》2012,35(3):334-349
Let Ω be a sufficiently regular bounded connected open subset of such that 0 ∈ Ω and that is connected. Then we take q11, … ,qnn ∈ ]0,+ ∞ [and . If ε is a small positive number, then we define the periodically perforated domain , where {e1, … ,en} is the canonical basis of . For ε small and positive, we introduce a particular Dirichlet problem for the Laplace operator in the set . Namely, we consider a Dirichlet condition on the boundary of the set p + εΩ, together with a periodicity condition. Then we show real analytic continuation properties of the solution and of the corresponding energy integral as functionals of the pair of ε and of the Dirichlet datum on p + ε?Ω, around a degenerate pair with ε = 0. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
52.
53.
The relation between the Lyapunov exponent spectrum of a periodically excited non-autonomous dynamical system and the Lyapunov
exponent spectrum of the corresponding autonomous system is given and the validity of the relation is verified theoretically
and computationally. A direct method for calculating the Lyapunov exponent spectrum of non-autonomous dynamical systems is
suggested in this paper, which makes it more convenient to calculate the Lyapunov exponent spectrum of the dynamical system
periodically excited. Following the definition of the Lyapunov dimensionD
L
(A)
of the autonomous system, the definition of the Lyapunov dimensionD
L
of the non-autonomous dynamical system is also given, and the difference between them is the integer 1, namely,D
L
(A)
−DL=1. For a quasi-periodically excited dynamical system, similar conclusions are formed.
Project supported by the National Natural Science Foundation of China (No. 19772027), the Science Foundation of Shanghai Municipal
Commission of Education (99A01) and the Science Foundation of Shanghai Municipal Commission of Science and Technology (No.
98JC14032). 相似文献
54.
The contact problem of the plane theory of elasticity is studied for an elastic orthotropic half-plane supported by periodically located (infinitely many) stringers of equal resistance. Using the methods of the theory of a complex variable, the problem is reduced to the Keldysh-Sedov type problem for a circle. The solution of the problem is constructed. 相似文献
55.
The shapes of magnetoelastic shear body waves in periodically inhomogeneous magnetostrictive dielectric media are studied
with emphasis on wave shapes in the neighborhood of the zones of interaction of elastic and magnetostatic waves
__________
Translated from Prikladnaya Mekhanika, Vol. 42, No. 10, pp. 13–20, October 2006. 相似文献
56.
57.
The Quasi-phase-matching periodically poled flux-grown KTP by high electrical field method is researched. A 8×5×1mm3, Λ=9.0μm PPKTP wafer is successfully fabricated for the first order QPM SHG. The interactive length of the sample is about 3mm. The SHG scheme of Nd:YAG at 1064nm tested that the output power of cw 532nm green light is 0.2mw at room temperature with fundamental power of 1.2w. The normalized conversion efficiency is about 0.09% (W·cm)-1. 相似文献
58.
The results of a theoretical study of quasi-phase matched processes at self-frequency conversion in the Q-switched regime are presented. A scheme containing a periodically poled active nonlinear crystal and an acousto-optical modulator inserted inside the cavity is considered. Solutions of the set of equations describing such scheme are obtained by numerical methods. The time dynamics of the self-frequency doubling, self-frequency summing, and self-parametric frequency conversion processes are studied in detail. The energy characteristics of the radiation are also calculated and compared with those in the stationary regime. 相似文献
59.
We consider the drift and diffusion properties of periodically driven renewal processes. These processes are defined by a periodically time dependent waiting time distribution, which governs the interval between subsequent events. We show that the growth of the cumulants of the number of events is asymptotically periodic and develop a theory which relates these periodic growth coefficients to the waiting time distribution defining the periodic renewal process. The first two coefficients, which are the mean frequency and effective diffusion coefficient of the number of events are considered in greater detail. They may be used to quantify stochastic synchronization. 相似文献
60.
利用外加电场极化的方法,分别研究了三种不同方式布置的极化电极对C向切割LiNbO3< /sub>晶体极化反转畴扩张的影响.实验结果表明在相同极化条件下,当极化电极长度方向与六边 形反转畴一对边呈90°和0°角时,极化扩张速度分别为0.089μm/ms和0.011μm/ms.实验结果揭示,为了有效地控制极化占空比,在制备一维准相位匹配LiNbO3晶体时应 避免极化电极与六边形反转畴壁中一对边呈90°的情况.
关键词:
周期极化
极化扩张
准相位匹配 相似文献