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排序方式: 共有1496条查询结果,搜索用时 15 毫秒
991.
992.
《Journal of Pure and Applied Algebra》2024,228(3):107493
The statements of Theorem 6.11 and Theorem 7.8 in the published paper are not correct: each have a missing hypothesis which is needed for their proof. We restate both theorems (with the required extra hypothesis), and give corrected proofs of each. 相似文献
993.
994.
Using an ultrafast photonic first-order differentiator applied on a partially coherent field, the generation of two correlated temporal waveforms is reported and their correlation properties upon linear and nonlinear propagation along the two orthogonal polarization axes of a dispersive optical fiber are studied. Temporal correlations are maintained in linear propagation whereas Kerr nonlinearity generates anticorrelated temporal intensity patterns for both partially and uncorrelated fields. Experiments are in close agreement with the theoretical analysis. 相似文献
995.
996.
Mohamed Ouzahra 《Mathematical Methods in the Applied Sciences》2020,43(12):7311-7325
This paper presents necessary and sufficient conditions for uniform exponential stabilization of a class of nonlinear systems in Banach state spaces. The stabilization assumptions are formulated in terms of integral estimates involving the control operator and the state of the uncontrolled version of the system at hand. An explicit estimate of the convergence speed is given. Applications to feedback stabilization of affine control systems are given. Illustrative examples are further provided. 相似文献
997.
998.
《Applied and Computational Harmonic Analysis》2020,48(1):46-63
There is a finite number of tight frames of n distinct vectors for which are the orbit of a vector under a unitary action of the cyclic group . These cyclic harmonic frames (or geometrically uniform tight frames) are used in signal analysis and quantum information theory, and provide many tight frames of particular interest. Here we investigate the conjecture that grows like . By using a result of Laurent which describes the set of solutions of algebraic equations in roots of unity, we prove the asymptotic estimate By using a group theoretic approach, we also give some exact formulas for , and estimate the number of cyclic harmonic frames up to projective unitary equivalence. 相似文献
999.
1000.