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Literatura científica selecionada sobre o tema "Réflexion interne (Spectroscopie)"
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Teses / dissertações sobre o assunto "Réflexion interne (Spectroscopie)"
Grognot, Marianne. "Imagerie térahertz par réflexion interne totale pour la biologie. : Application à l'étude de la perméabilisation cellulaire". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX068/document.
Texto completo da fonteLying between 0.1 to 10x1012 Hz, the terahertz radiation occupies a middle ground between microwaves and infrared light waves, sometimes named “the terahertz gap” for technologies relevant to generation and detection have only risen at the beginning of the 90’s and aren’t fully developed yet. Nevertheless, there are strong exploratory incentives because of terahertz spectroscopic sensitivity to molecular states (rotational, vibrational…) and weak bounds in and between molecules. In the case of biological object, terahertz waves are especially sensitive to water: its quantity, physico-chemical state and solutes. We implemented an Attenuated Total internal Reflection (ATR) imaging setup in order to distinguish live cells from their physiological bathing medium. Throughout this work, we characterized both experimentally and experimentally the ATR setup. The first demonstration of the contrast origin in the terahertz images obtained was done. It arises from the intracellular content, more specifically the proteins and peptides dissolved in the cytoplasm.A precise analysis of the underlying mechanism of this proteinaceous terahertz contrast has also been developed. It gives access to original spectroscopic information about water, dissolved proteins and the hydration shell around them.Taking advantage of our whole setup comprehension, we proposed it as a non-invasive tool for quantitative live-cell permeabilization assessment in physiological conditions. During permeabilization, aka increased molecular transfers through the cell membrane, our tool allows to quantify the transfer of peptides and proteins. Live-cell permeabilization has a large application range, from fluorochrome entry in imaging, to drugs or gene therapy. In order to ensure molecules crossing the cell membrane, it’s necessary to alter its properties without compromising cell viability.A study of two permeabilization methods is proposed: chemical permeabilization and electroporation. In both cases dose effect mechanisms were quantitatively characterized. Our terahertz tool demonstrated great advantages over classical permeabilization quantification methods and permeabilization reversibility assessment methods
Nguyen, Tuan Anh. "Protection du fer par les polymères conducteurs polyaniline et composite (polyaniline - poly 1,5 - diaminonaphtalène) : électropolymérisation : étude du mécanisme de protection par les mesures électrochimiques locales". Paris 7, 2002. http://www.theses.fr/2002PA077131.
Texto completo da fonteAlagao, Mary Angelie. "Characterization and optimization of the Evanescent Wave Coronagraph". Electronic Thesis or Diss., Saint-Etienne, 2023. http://www.theses.fr/2023STET0060.
Texto completo da fonteDirect imaging of exoplanets remains challenging due to the high contrast and the small angular separation between the star and the planet. It requires suppressing the blinding glare from the star and ensuring that the planet's faint light is not buried deep in various noises. Successful detection depends on the technological readiness and maturity of techniques and algorithms employed while considering the significant trade-offs on raw contrast, inner working angle, and throughput. One of its key components is the use of coronagraphs – instruments with the sole purpose of blocking/reducing the light from the star. This work presents a new type of Lyot coronagraph, invented by Dr. Yves Rabbia, that relies on the frustrated total internal reflection (FTIR) principle to suppress the starlight. This coronagraph is aptly called the Evanescent Wave Coronagraph (EvWaCo) owing to its nature that its focal plane mask, comprising a lens and a prism, reflects the off-axis source (planet) and transmits the on-axis source (star) by capturing the evanescent waves. This thesis aims to provide the reader with the groundwork that highlights EvWaCo's three main advantages: i) the mask is inherently achromatic, ii) the size of the mask is adjustable by changing the pressure between the lens and the prism, and iii) both the stellar light and the planet light can be collected simultaneously for low-order wavefront sensing, and proper stellar light centering. The performance of EvWaCo is assessed through experiments in a laboratory and then compared to numerical simulations. The experimental results show a raw contrast equal to a few 10-4 at 3 ��/�� over the full I-band (��c = 800 nm, ∆��/�� ≈ 20%) and at 4 ��/�� over the full R-band (��c = 650 nm, ∆��/�� ≈ 23%). The simulations confirm the achromatic rejection capability of EvWaCo as it showed a raw contrast of 10-4 at the same radial distance over both bandpasses. This thesis concludes with the status of its testbed and future perspectives
Livros sobre o assunto "Réflexion interne (Spectroscopie)"
M, Mirabella Francis, ed. Internal reflection spectroscopy: Theory and applications. New York: Marcel Dekker, 1993.
Encontre o texto completo da fonteInternal Reflection Spectroscopy: Theory and Applications. CRC Press LLC, 1993.
Encontre o texto completo da fonteMirabella, Francis M. Internal Reflection Spectroscopy: Theory and Applications. Taylor & Francis Group, 2020.
Encontre o texto completo da fonteMirabella, Francis M. Internal Reflection Spectroscopy: Theory and Applications. Taylor & Francis Group, 2020.
Encontre o texto completo da fonteMirabella, Francis M. Internal Reflection Spectroscopy: Theory and Applications. Taylor & Francis Group, 2020.
Encontre o texto completo da fonte