TY  - CHAP
AU  - Sajfert, Vjekoslav D.
AU  - Popov, Dušan
AU  - Jaćimovski, Stevo
AU  - Tošić, Bratislav
PY  - 2011
UR  - http://jakov.kpu.edu.rs/handle/123456789/366
AB  - In connection with the experimental result which stated that polyethylene foil amplifies about three times the penetrated light, we propose two theoretical explanations of this phenomenon. One of them is that several amplified peaks are the consequence of the forming of solitons in a polyethylene chain whose velocities are close to the velocity of sound. Forming of solitons, together with boundary conditions in a polyethylene macromolecules chain, which contain about thirty monomers, lead to the amplification of light. The second explanation requires introduction of homeopolar excitons in polymer macromolecules. Both energy gap of homeopolar excitons and width of homeopolar exciton zone are of the same order of magnitude. It means that transitions in a very wide zone give light quanta which are able to amplify the initial light. In order to avoid some confusion and misunderstandings, we wish to point out the following. Atoms and molecules as the whole are treated classically (transition through potential barriers, for example, etc.). The exception to this rule are phonon theories of crystals where the phonon is considered as a quanta of boson field, i.e., it means that, in the theory of mechanical oscillations, molecules and atoms as the whole are treated quantum mechanically. On the other hand, elementary excitations in crystals such as excitons, vibrons, spin waves, and ferroelectric excitations, etc., which arise from changes of some parts of atoms or molecules are treated quantum mechanically exclusively. In the analyses of this work, the excitations of an individual molecule subsystem (i.e. the quantum objects) would serve as an explanation of the light amplification by a polymer chain.
T2  - Quantum Frontiers of Atoms and Molecules
T1  - Theoretical explanation of light amplifying by polyethylene foil
SP  - 141
EP  - 155
UR  - https://hdl.handle.net/21.15107/rcub_jakov_366
ER  - 

@inbook{
author = "Sajfert, Vjekoslav D. and Popov, Dušan and Jaćimovski, Stevo and Tošić, Bratislav",
year = "2011",
abstract = "In connection with the experimental result which stated that polyethylene foil amplifies about three times the penetrated light, we propose two theoretical explanations of this phenomenon. One of them is that several amplified peaks are the consequence of the forming of solitons in a polyethylene chain whose velocities are close to the velocity of sound. Forming of solitons, together with boundary conditions in a polyethylene macromolecules chain, which contain about thirty monomers, lead to the amplification of light. The second explanation requires introduction of homeopolar excitons in polymer macromolecules. Both energy gap of homeopolar excitons and width of homeopolar exciton zone are of the same order of magnitude. It means that transitions in a very wide zone give light quanta which are able to amplify the initial light. In order to avoid some confusion and misunderstandings, we wish to point out the following. Atoms and molecules as the whole are treated classically (transition through potential barriers, for example, etc.). The exception to this rule are phonon theories of crystals where the phonon is considered as a quanta of boson field, i.e., it means that, in the theory of mechanical oscillations, molecules and atoms as the whole are treated quantum mechanically. On the other hand, elementary excitations in crystals such as excitons, vibrons, spin waves, and ferroelectric excitations, etc., which arise from changes of some parts of atoms or molecules are treated quantum mechanically exclusively. In the analyses of this work, the excitations of an individual molecule subsystem (i.e. the quantum objects) would serve as an explanation of the light amplification by a polymer chain.",
journal = "Quantum Frontiers of Atoms and Molecules",
booktitle = "Theoretical explanation of light amplifying by polyethylene foil",
pages = "141-155",
url = "https://hdl.handle.net/21.15107/rcub_jakov_366"
}

Sajfert, V. D., Popov, D., Jaćimovski, S.,& Tošić, B.. (2011). Theoretical explanation of light amplifying by polyethylene foil. in Quantum Frontiers of Atoms and Molecules, 141-155.
https://hdl.handle.net/21.15107/rcub_jakov_366

Sajfert VD, Popov D, Jaćimovski S, Tošić B. Theoretical explanation of light amplifying by polyethylene foil. in Quantum Frontiers of Atoms and Molecules. 2011;:141-155.
https://hdl.handle.net/21.15107/rcub_jakov_366 .

Sajfert, Vjekoslav D., Popov, Dušan, Jaćimovski, Stevo, Tošić, Bratislav, "Theoretical explanation of light amplifying by polyethylene foil" in Quantum Frontiers of Atoms and Molecules (2011):141-155,
https://hdl.handle.net/21.15107/rcub_jakov_366 .

TY  - JOUR
AU  - Sajfert, Vjekoslav D.
AU  - Mašković, Ljiljana
AU  - Jaćimovski, Stevo
AU  - Popov, Dušan
AU  - Tošić, Bratislav
PY  - 2008
UR  - http://jakov.kpu.edu.rs/handle/123456789/217
AB  - The superconductivity properties of cylinder with nano cross-section are investigated. In the nearest neighbours approximation, electron Hamiltonian of cylinder decays onto two independent Hamiltonians. One corresponds to electrons which propagate along chains parallel to the axis of cylinder. Second correspond to electrons moving in discs. The electron-phonon interaction Hamiltonians are found and superconductive properties were examined in the frames of BCS approach. It was shown that superconductive temperature in chains is several Kelvins, while in discs it can be higher for two orders of magnitude. It is also shown that magnetic field produced by electron currents in discs is of the order of thousand Tesla, i.e., extremely high.
PB  - Amer Scientific Publishers, Stevenson Ranch
T2  - Journal of computational and theoretical nanoscience
T1  - Electron-Phonon Interaction in Cylindrical Nanostructures
VL  - 5
IS  - 7
SP  - 1230
EP  - 1239
DO  - 10.1166/jctn.2008.2558
ER  - 

@article{
author = "Sajfert, Vjekoslav D. and Mašković, Ljiljana and Jaćimovski, Stevo and Popov, Dušan and Tošić, Bratislav",
year = "2008",
abstract = "The superconductivity properties of cylinder with nano cross-section are investigated. In the nearest neighbours approximation, electron Hamiltonian of cylinder decays onto two independent Hamiltonians. One corresponds to electrons which propagate along chains parallel to the axis of cylinder. Second correspond to electrons moving in discs. The electron-phonon interaction Hamiltonians are found and superconductive properties were examined in the frames of BCS approach. It was shown that superconductive temperature in chains is several Kelvins, while in discs it can be higher for two orders of magnitude. It is also shown that magnetic field produced by electron currents in discs is of the order of thousand Tesla, i.e., extremely high.",
publisher = "Amer Scientific Publishers, Stevenson Ranch",
journal = "Journal of computational and theoretical nanoscience",
title = "Electron-Phonon Interaction in Cylindrical Nanostructures",
volume = "5",
number = "7",
pages = "1230-1239",
doi = "10.1166/jctn.2008.2558"
}

Sajfert, V. D., Mašković, L., Jaćimovski, S., Popov, D.,& Tošić, B.. (2008). Electron-Phonon Interaction in Cylindrical Nanostructures. in Journal of computational and theoretical nanoscience
Amer Scientific Publishers, Stevenson Ranch., 5(7), 1230-1239.
https://doi.org/10.1166/jctn.2008.2558

Sajfert VD, Mašković L, Jaćimovski S, Popov D, Tošić B. Electron-Phonon Interaction in Cylindrical Nanostructures. in Journal of computational and theoretical nanoscience. 2008;5(7):1230-1239.
doi:10.1166/jctn.2008.2558 .

Sajfert, Vjekoslav D., Mašković, Ljiljana, Jaćimovski, Stevo, Popov, Dušan, Tošić, Bratislav, "Electron-Phonon Interaction in Cylindrical Nanostructures" in Journal of computational and theoretical nanoscience, 5, no. 7 (2008):1230-1239,
https://doi.org/10.1166/jctn.2008.2558 . .