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    Energy spectrum of isomer no. 3 of C82 fullerene of C 2 symmetry
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    We propose a new approach for modeling the quantum ring single particle energy spectrum. The approach is based on separation of variables in the Schr\"odinger equation in oblate spheroidal coordinates. We consider a model of a spheroidal quantum ring with infinite walls. Our simple model allowed us to study the spectra for quantum rings of different shapes. The spectrum is calculated for the ground and several excited states and the ring shape dependence of the spectrum is demonstrated. The spectrum can demonstrate parabolic or non-parabolic dependence on the magnetic quantum number for different shapes of the ring
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    We propose a new approach for modeling the quantum ring single particle energy spectrum. The approach is based on separation of variables in the Schrödinger equation in oblate spheroidal coordinates. We consider a model of a spheroidal quantum ring with infinite walls. Our simple model allows us to study the spectra for quantum rings of different shapes. The spectrum is calculated for the ground and several excited states and the ring shape dependence of the spectrum is demonstrated.
    Energy spectrum
    Quantum number
    Separation of variables
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    For looking measured energy spectrum as classic spectrum estimation of the input signal, the method of re-estimating the nuclear energy spectrum by AR model is introduced. The spectrum is smoother, energy peak is narrower and number of particle in every peak and the spectrum are fixedness, after processed by the method.
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    A model operator $H$ associated with the energy operator of a system describing three particles in interaction, without conservation of the number of particles, is considered. The precise location and structure of the essential spectrum of $H$ is described. The existence of infinitely many eigenvalues below the bottom of the essential spectrum of $H$ is proved for the case where an associated generalized Friedrichs model has a resonance at the bottom of its essential spectrum. An asymptotics for the number $N(z)$ of eigenvalues below the bottom of the essential spectrum is also established. The finiteness of eigenvalues of $H$ below the bottom of the essential spectrum is proved if the associated generalized Friedrichs model has an eigenvalue with energy at the bottom of its essential spectrum.
    Essential spectrum
    Discrete spectrum
    Hamiltonian (control theory)
    Energy spectrum
    Operator (biology)
    Continuous spectrum
    Energy operator
    1: Preliminaries and historical overview. 2: Theoretical tools of fullerene research. 3: The C60 fullerene. 4: The C70 fullerene. 5: C76, C78, C82, and C84: The medium-size fullerenes. 6: Large spheroidal and tubular fullerenes, graphitic microtubules, and hypothetical polymeric allotropes of carbon. 7: Fullerenes with fewer than sixty carbon atoms. 8: Endohedral complexes. 9: Heterofullerenes and fullerene derivatives. 10: Solid-state properties of fullerenes and their drivatives. 11: Conclusions and future directions
    Carbon fibers
    Fullerene chemistry
    Endohedral fullerene
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