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1. |
Record Nr. |
UNINA9910420937903321 |
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Autore |
Bernardo Luís Miguel |
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Titolo |
Luz, vida e saúde : a ação da luz sobre os seres vivos e a saúde humana numa perspectiva científica, histórica e cultural / / Luís Miguel Bernardo |
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Pubbl/distr/stampa |
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Coimbra University Press, 2020 |
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Portugal : , : Coimbra University Press, , 2020 |
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ISBN |
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Descrizione fisica |
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1 online resource (370 pages) : illustrations; digital, PDF file(s) |
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Collana |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di bibliografia |
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Includes bibliographical references. |
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Sommario/riassunto |
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Light is not an inert physical entity. Omnipresent in Nature, it exerts an essential action on living beings, from the smallest to the most complex, including the humans. All living beings depend on the light for their development and life conservation. According to the spectral composition, the effects of light can be beneficial or harmful. Light regulates confined or systemic biological processes and may be used as a therapeutic tool. Light pollution may cause harmful effects in plants and animals, disturbing the stability of ecosystems. All these aspects are treated in Light, Life and Health, in a scientific, historical and sociocultural approach. Within international context, the work that Portuguese produced to study and disseminate those subjects is exposed and a reference is made to the way the phototherapies have been disseminated and established in Portugal. |
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2. |
Record Nr. |
UNINA9910139243103321 |
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Autore |
Geru Ion |
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Titolo |
Resonance Effects of Excitons and Electrons : Basics and Applications / / by Ion Geru, Dieter Suter |
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Pubbl/distr/stampa |
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Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 2013 |
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ISBN |
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Edizione |
[1st ed. 2013.] |
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Descrizione fisica |
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1 online resource (XVII, 283 p. 36 illus., 14 illus. in color.) |
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Collana |
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Lecture Notes in Physics, , 0075-8450 ; ; 869 |
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Disciplina |
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Soggetti |
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Solid state physics |
Optical materials |
Electronics - Materials |
Spectrum analysis |
Microscopy |
Lasers |
Photonics |
Semiconductors |
Materials science |
Solid State Physics |
Optical and Electronic Materials |
Spectroscopy and Microscopy |
Optics, Lasers, Photonics, Optical Devices |
Characterization and Evaluation of Materials |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Bibliographic Level Mode of Issuance: Monograph |
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Nota di bibliografia |
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Includes bibliographical references (pages 259-276) and index. |
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Nota di contenuto |
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Excitons and Biexcitons in Semiconductors -- Paramagnetic and Paraelectric Resonances of Excitons -- Exciton Acoustical Resonance -- Double Resonances -- Investigations of Excitons by Means of NMR Spectroscopy -- Interaction of Excitons with Paramagnetic Centers -- Effects of Deep Saturation. |
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Sommario/riassunto |
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This book presents the various types of resonance effects on excitons, biexcitons and the local electronic centers (LEC) in solids, such as paramagnetic and paraelectric resonances on excitons, exciton acoustic |
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resonance at intra- and interband transitions, radio-optical double resonance on excitons, hole-nuclear double resonance on localized biexcitons, ENDOR and acoustic ENDOR on LEC. The criteria for the generation of coherent photons, phonons and magnons by excitons are explained. The interactions of excitons and biexcitons with paramagnetic centers and nuclear spins, the indirect interaction between the PC through a field of excitons as well as the quasienergy spectrum of excitons and spin systems are discussed. It is proved that the interaction of paramagnetic centers with excitons increases the spin relaxation rate of paramagnetic centers in comparison with the case of their interaction with free carriers. The giant magneto-optical effects in semi-magnetic semiconductors are theoretically interpreted. In recent years, a new perspective has been added to these systems and their interactions: they can be used for storing and processing information in the form of quantum bits (qubits), the building blocks of quantum computers. The basics of this emerging technology are explained and examples of demonstration-type quantum computers based on localized spins in solids are discussed. |
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