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Sufficient conditions for assignability of nonuniform dichotomy spectrum of discrete time-varying linear systemsBabiarz, Artur, Czornik, Adam, Siegmund, Stefan 22 February 2024 (has links)
We consider a version of the pole placement problem for tempered one sided linear discrete time time varying linear systems. We prove a sufficient condition for assignability of the nonuniform dichotomy spectrum by linear feedback. The main result is that the nonuniform dichotomy spectrum is assignable if the system is completely controllable and certain lower asymptotic bound for the controllability Gramian holds.
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“Green” Aqueous Synthesis and Advanced Spectral Characterization of Size-Selected Cu2ZnSnS4 Nanocrystal InksStroyuk, Oleksandr, Raevskaya, Alexandra, Selyshchev, Oleksandr, Dzhagan, Volodymyr, Gaponik, Nikolai, Zahn, Dietrich R.T., Eychmüller, Alexander 26 April 2019 (has links)
Structure, composition, and optical properties of colloidal mercaptoacetate-stabilized Cu2ZnSnS4 (CZTS) nanocrystal inks produced by a “green” method directly in aqueous solutions were characterized. A size-selective precipitation procedure using 2-propanol as a non-solvent allows separating a series of fractions of CZTS nanocrystals with an average size (bandgap) varying from 3 nm (1.72 eV) to 2 nm (2.04 eV). The size-selected CZTS nanocrystals revealed also phonon confinement, with the main phonon mode frequency varying by about 4 cm−1 between 2 nm and 3 nm NCs.
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