Relevant bibliographies by topics / Nelineární spektroskopie

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Academic literature on the topic 'Nelineární spektroskopie'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Dissertations / Theses on the topic "Nelineární spektroskopie"

1

Tofel, Pavel. "Nelineární elektro-ultrazvuková spektroskopie rezistorů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233559.

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Elektro-ultrazvuková spektroskopie je založena na interakci dvou signálů, elektrického střídavého signálu s frekvencí fE a ultrazvukového signálu s frekvencí fU. Ultrazvukový signál mění vzdálenost mezi vodivými zrny ve vzorku a tím mění jeho celkový elektrický odpor R. Změna odporu R je proměnná s frekvencí ultrazvukového signálu fU. Vzorek, který obsahuje mnoho defektů ve své struktuře, vykazuje vysokou změnu odporu R v porovnání se vzorkem bez defektů při stejné hodnotě ultrazvukového a elektrického signálu. V disertační práci je popsána elektro-ultrazvuková metoda na tlustovrstvých rezisto
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Timčaková, Kristýna. "Monitorování a analýza koroze výztužné oceli v železobetonových prvcích a konstrukcích akustickými metodami." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-401591.

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The dissertation thesis deals with the study of non-destructive acoustic methods as instruments for monitoring and analysing corrosion of reinforcing steel in reinforced concrete elements. Four acoustic methods were selected for this task - the impact-echo method, the nonlinear acoustic spectroscopy method, the acoustic emission method, and the ultrasonic pulse velocity method. To verify the functionality of these methods, testing was carried out on three sets of reinforced concrete samples that had been exposed to the effects of sodium chloride, which corroded the embedded steel reinforcement
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Carbol, Ladislav. "Měření akustických vlastností stavebních materiálů pomocí pseudonáhodné sekvence." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-355599.

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The thesis deals with research of pulse compression of the acoustic signal in terms of applications in civil engineering. Based on the study and analysis of these methods, automated measuring equipment for non-destructive testing with pseudorandom sequence of maximum length and automated signal analysis, have been designed and implemented. In a single test cycle are obtained three parameters that characterize the linear and nonlinear behavior of the sample. A nonlinear parameter, Time of Flight of ultrasonic wave in the sample is further in the work compared with the conventional pulse measuri
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Linhart, Jan. "Nelineární optická spektroskopie molekulárních komplexů." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-300489.

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Práce se zabývá teorií nelineární spektroskopie a projevy kvantové koherentní dynamiky v nelineární spektroskopii. Poskytuje stručný přehled spektroskopických metod se zaměřením na metodu pump-probe. Dále rozví- jíme teorii nelineární odezvy, přičemž vycházíme z obecného N-wave mixing experimentu, a dospíváme ke tvaru odezvové funkce třetího řádu vyjádřené pomocí Liouvillových drah. Pro vybrané modelové systémy sledujeme koher- entní efekty, které se projevují v 2D a pump-probe spektrech, a provádíme jejich porovnání. D·raz je kladen na objasnění jev· relaxace a excitonové koherence mezi dvěma
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5

Zukerstein, Martin. "Ultrarychlé vysoce nelineární procesy v diamantu." Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-436316.

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Intense few-cycle laser pulses can significantly affect the properties of transparent solids during the interaction. These processes take place on femtosecond time scales and they can be studied using ultrafast spectroscopic methods. This dissertation deals with highly nonlinear processes in diamond. In the interaction with a crystalline diamond, we observed a strong nonlinear broadening of the spectrum due to self-phase modulation effect, which allowed us to create a simple technique for compression of pulses from laser oscillator. At the same time, strongly nonlinear five-photon absorption w
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Mathauserová, Jana. "Nové molekulární materiály pro nelineární optiku - příprava a detailní charakterizace." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-324837.

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In this thesis both an experimental and computational study of selected prospective materials for nonlinear optics is presented. The main focus was put on 2-aminopyrimidinium hydrogen- phosphite (AMPPO3), a salt with high SHG efficiency and Type I. phase matching properties. AMPPO3 had been studied by our research group and its favourable qualities such as easy preparation, colourlessness, great water solubility and good crystallinity motivated further in- terest and the attempts for the growth of bulk single crystals from thermostated aqueous solu- tions as presented here. The products are me
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7

Kloda, Matouš. "Příprava a studium nových krystalických materiálů pro nelineární optiku odvozených od dusíkatých heterocyklů." Doctoral thesis, 2019. http://www.nusl.cz/ntk/nusl-404297.

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The presented Ph.D. thesis is aimed at the preparation and characterisation of novel crystalline materials with application potential in nonlinear optics (NLO). The main goal was preparation of crystalline salts and adducts (cocrystals) of selected nitrogen-containing heterocycles with a range of organic and inorganic acids. Based on previous study and quantum- chemical calculations, the following starting heterocycles were selected: 2-aminopyrimidine, 4-aminopyrimidine, 5-aminopyrimidine, 3-amino-1,2,4-triazine and 3-amino-5,6-dimethyl- 1,2,4-triazine. The prepared materials were characterise
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8

Kuchařík, Jiří. "Studium transportu náboje v polovodičových nanostrukturách pomocí časově rozlišené multi-terahertzové spektroskopie." Doctoral thesis, 2019. http://www.nusl.cz/ntk/nusl-404545.

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Terahertz conductivity spectra contain information on charge transport mechanisms and charge confinement on nanometer distances. In this thesis, we make a substantial progress in understanding of terahertz conductivity in several regimes. First, we theoretically investigate linear terahertz conductivity of confined electron gas: while the spectra of degenerate electron gas exhibit geometrical resonances, the response in non-degenerate case smears into a single broad resonance due to the wide distribution of charge velocities. Then, we theoretically and experimentally analyze various TiO2 nanot
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Kozák, Martin. "Studium optických nelinearit v polovodičích a polovodičových nanostrukturách." Doctoral thesis, 2013. http://www.nusl.cz/ntk/nusl-327446.

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This Ph.D. thesis is focused on the study of optical nonlinearities and dynamics of excited charge carriers in monocrystalline diamond, nanocrystalline diamond and silicon. The dynamics of high density carriers in bulk diamond is investigated in detail (the transition from excitons and free carriers to electron-hole liquid or plasma). We study the picosecond dynamics of electron-hole liquid condensation using several techniques of time-resolved optical spectroscopy and demonstrate its evaporation by femtosecond laser pulses. We also propose two new optical techniques for measurement of lifetim
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10

Olšina, Jan. "Teorie relaxace a přenosu energie v otevřených kvantových systémech." Doctoral thesis, 2014. http://www.nusl.cz/ntk/nusl-326202.

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The work summarizes basic theory of relaxation, energy transfer and decoher- ence in photosynthetic molecular aggregates described as open quantum systems and basic theory of third order coherent non-linear spectroscopy. The work presents two methods for calculation of photo-induced dynamics of molecular aggregates. The methods relax certain approximations of the theories commonly used to model the relaxation and energy transfer in the molecular systems on the sub-picosecond time scale. The first theory derived in the formalism of para- metric projection operators accounts for correlations in
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