The probe nuclei 62 Zn/ 62 Cu, 187 W/ 187 Re and 111 In/ 111 Cd for perturbed angular correlation studies are produced at the CIAE HI 13 tandem accelerator through the nuclear reactions 63 Cu(p,2n) 62 Zn,Cd(p, x n) 111 In and 186 W(d,p) 187 W. The production cross sections of these nuclei are measured.
In the present work two hydrogen storage alloys Pd_(0.75)Ag_(0.25) 和 LaNi_(4.25)Al_(0.75) are studied by the positron annihilation and perturbed angular correlation techniques.
Under the unobservable disturbance ei form martingale differences, the asymptotic normality of wavelet estimators of g with f being known or unknown function is studied.
By using the exponential reaching law technology, a sliding mode controller was designed for Lorenz chaotic system subject to an unknown external disturbance.
The proposed controller not only stabilized closed-loop uncertain systems but also guaranteed a prescribed H∞ norm bound of closed-loop transfer matrix from the disturbance to controlled output.
Results showed that topographic characteristics and disturbance pattern have much more impacts on the distribution of landscape elements than do horizontal geographical position in the study area.
As an application we prove new theorems concerning stability offrames (and frame-like decompositions) under perturbation in both Hilbert spaces and Banach spaces.
If the sequence of functions ?j, k is a wavelet frame (Riesz basis) or Gabor frame (Riesz basis), we obtain its perturbation system ψj,k which is still a frame (Riesz basis) under very mild conditions.
For example, our result shows that a "slight" random perturbation of the classical Cantor set becomes a "nice" set in the sense that its Fourier dimension equals its Hausdorff dimension.
We present an algorithm which, based on certain properties of analytic dependence, constructs boundary perturbation expansions of arbitrary order for eigenfunctions of elliptic PDEs.
By using the comparision theorem and V-function method, the author proves the existence and uniqueness of a positive almost periodic solution and its stability under disturbances from the hull.
A dynamic signal is introduced and adaptive nonlinear damping terms are used to restrain the effects of unmodeled dynamics, nonlinear uncertainties and unknown bounded disturbances.
The ideas of adaptive nonlinear damping and changing supply functions were used to counteract the effects of parameter and nonlinear uncertainties, unmodeled dynamics and unknown bounded disturbances.