970 resultados para Fractional Operator
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We discuss the modelling of dielectric responses of amorphous biological samples. Such samples are commonly encountered in impedance spectroscopy studies as well as in UV, IR, optical and THz transient spectroscopy experiments and in pump-probe studies. In many occasions, the samples may display quenched absorption bands. A systems identification framework may be developed to provide parsimonious representations of such responses. To achieve this, it is appropriate to augment the standard models found in the identification literature to incorporate fractional order dynamics. Extensions of models using the forward shift operator, state space models as well as their non-linear Hammerstein-Wiener counterpart models are highlighted. We also discuss the need to extend the theory of electromagnetically excited networks which can account for fractional order behaviour in the non-linear regime by incorporating nonlinear elements to account for the observed non-linearities. The proposed approach leads to the development of a range of new chemometrics tools for biomedical data analysis and classification.
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2000 Mathematics Subject Classification: 26A33 (main), 44A40, 44A35, 33E30, 45J05, 45D05
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We characterize the range of some spaces of functions by the Fourier transform associated with the spherical mean operator R and we give a new description of the Schwartz spaces. Next, we prove a Paley-Wiener and a Paley-Wiener-Schawrtz theorems.
On Multi-Dimensional Random Walk Models Approximating Symmetric Space-Fractional Diffusion Processes
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Mathematics Subject Classification: 26A33, 47B06, 47G30, 60G50, 60G52, 60G60.
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Mathematics Subject Classification: 47B38, 31B10, 42B20, 42B15.
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2000 Mathematics Subject Classification: 35J05, 35C15, 44P05
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2000 Mathematics Subject Classification: 26A33 (primary), 35S15 (secondary)
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2000 Mathematics Subject Classification: Primary 26A33; Secondary 35S10, 86A05
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2000 Mathematics Subject Classification: 26A33, 33C45
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2000 Mathematics Subject Classification: 42B20, 42B25, 42B35
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2000 Mathematics Subject Classification: 44A40, 44A35
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2000 Mathematics Subject Classification: 34K99, 44A15, 44A35, 42A75, 42A63
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2000 Mathematics Subject Classification: 33D15, 33D90, 39A13
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2000 Mathematics Subject Classification: Primary 46F12, Secondary 44A15, 44A35
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2000 Mathematics Subject Classification: Primary 30C45, 26A33; Secondary 33C15