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Graffunder, Corinne Meltzer Weiner Bryan J. "Strengthening the prevention support system in CDC's Rape Prevention and Education RPE program". Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2093.
Pełny tekst źródłaTitle from electronic title page (viewed Feb. 17, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Public Health in the Department of Public Health." Discipline: Public Health; Department/School: Public Health.
Niang, Awa. "RPE et relaxation de composites moléculaires bidimensionnels". Toulouse 3, 1994. http://www.theses.fr/1994TOU30153.
Pełny tekst źródłaAssis, Alice [UNESP]. "Ressonância paramagnética eletrônica (RPE) aplicada em semicondutores orgânicos". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/99662.
Pełny tekst źródłaConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Um importante fator para a vida útil de dispositivos emissores de luz que utilizam compostos organometálicos como material emissor é a compreensão do seu mecanismo de degradação. O principal mecanismo de degradação destes materiais é a dissociação reversível/irreversível entre o átomo metálico central e um de seus ligantes após a excitação da molécula emissora. O complexo de carga formado em decorrência da dissociação irreversível pode ser sensível a campos magnéticos aplicados, através da interação do campo com o elétron desemparelhado. Desta forma, neste trabalho foram avaliados, através de medidas de ressonância paramagnética eletrônica (RPE), os possíveis processos de degradação em sistemas contendo a dispersão de dois compostos organometálicos fac tris(2-fenilpiridina) irídico (ir(ppy)3) e irídio bis(4,6-diflúorfenil)-piridinato-N, C2) picolinato (Flrpic) em diferentes matizes poliméricas como o poliestireno (PS), o poli(9,9-dioctifluoreno-2,7-dil) (PFO) e o polimetilmetacrilato (PMMA). Foi avaliada ainda a influência da molécula doadora de cargas 1,2,4,5-tetracianobenzeno (TCNB) na dispersão Flrpic+PS. Os processos de degradação foram estudados através da análise de diversos parâmetros, como o comportamento do sinal de RPE com a fotoexcitação, processo de relaxação do sinal em diferentes temperaturas e à avaliação do sinal de RPE dos compostos organometálicos puros e nas diferenetes dispersões em matizes poliméticas. Os resultados mostraram que um sinal de RPE relativamento baixo é obtido para o composto Flrpic puro. Entretanto a sua inserção em matrizes poliméricas promoveu um aumento significativo da intensidade do sinal. Dados de absorção e emissão óptica dos compostos evidenciaram que espécies excitadas são inicialmente fotogenadas nos complexos metálicos...
Understanding the degradation mechanism of light emitting devices based on organometallic compounds is the major point to improve their life time. The main mechanism of degradation of these materials is the reversible/irreversible dissociation between the central metallic atom and one of its ligands after the excitation of the emiting molecule. The carge complex formed due to the irreversible dissociation may be sensitive to applied magnetic fields through the field interaction with the unpaired electron. Thus, in this study the possible degradation processes in dispersion systems composed by two organometallic compounds Iridium(III)bis(4,6-fluorephenyl)-pyridiano-N, C2]picolinate (Flrpic) and iridium(III)fac-tris(2-phenylpyridine) (Ir (ppy)3) in different polymer matrices (polystyrene (PS), poly(methylmethacrylate) (PMMA) and poly(9,9-dioctylfluorene) (PFO) were analysed through electron paramagnetic resonance (ERP) technique. The influence of a charge donor molecule 1,2,4,5-tetracyanobenzene (TCNB) in Flrpic+PS dispersion was also examined. The processes of degradation were studied by analysing a variety of parameters such as the behaviour or the EPR signal with the photoexcitation, the process of signal relaxation at different temperatures and the evaluation of the EPR signal of pure organometallic compounds and its dispersion in different polymeric matrices. The results showed that a relatively low EPR signal is obtained for pure Flrpic compound. However its insertion in polymeric matrices caused a significant increase in the signal intensity. The optical absorption and emission data have shown that the excited species are initially photogenerated in metal complexes of those compounds, promoting the subsequent formation of paramagnetic centres, close to Indium atom. The energy levels analysis also suggests an exciton trapping process, which were associated with... (Complete abstract click electronic access below)
Stein, Roberto de Mello. "RPE em compostos de grafite intercalado com ALCL3". [s.n.], 1985. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277549.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Nós mostramos que no Composto de Grafite Intercalado com AlCl3, tipo aceitador, a dependência com a temperatura da resistividade no plano e na direção do eixo-c entre 100K e 300K, pode ser obtida experimentalmente através da análise da intensidade e da forma da linha da ressonância de spin dos portadores de carga. Os resultados indicam um comportamento metálico e do tipo salto por ativação térmica para o transporte de carga no plano e no eixo-c, respectivamente. A análise da ressonância no grafite puro apresenta dentro do erro experimental, a dependência com a temperatura esperada para a resistividade no plano e no eixo-c e uma susceptibilidade que independe da temperatura. A dependência da largura da linha é atribuída a dependência com a temperatura da mobilidade dos portadores e da razão entre a probabilidade de transição para "spin-flip" devido ao acoplamento spin-órbita e o espalhamento coulombiano. Para estágios um e sete os parâmetros da ressonância revelam uma transição de fase a 210K e 168K respectivamente
Abstract: We show that the temperature dependence of the in-plane and c-axis resitivities between 100K and 300K for the acceptor AlCl3 - Graphite Intercalated Compounds can be obtained from the analysis of the intensity and lineshape of the resonance in a conduction carrier spin resonance experiment. The results suggest a metallic and thermal activated hopping like character for the in-plane and c-axis charge transport respectively. The analysis of the resonance for pure graphite gives, within the experimental accuracy, the expected temperature dependence for the in-plane and c-axis resistivities, and an almost temperature independent Pauli paramagnetic susceptibility. The temperature dependence of the linewidth is attributed to the dependence of both the carrier s mobility and the ratio between the transition probability for spin-flip due to spin-orbit coupling and the coulomb scattering. For stage one and seven the resonance parameters reveal a phase transition at 210K and 168K respectively
Doutorado
Física
Doutor em Ciências
Assis, Andrei Paulo de. "Ressonância paramagnética eletrônica (RPE) aplicada em semicondutores orgânicos /". Bauru, 2012. http://hdl.handle.net/11449/99662.
Pełny tekst źródłaBanca: Claudio José Magon
Banca: José Humberto Dias da Silva
O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, POSMAT, tem caráter institucional e integra as atividades de pesquisa em materiais em diversos campi
Resumo: Um importante fator para a vida útil de dispositivos emissores de luz que utilizam compostos organometálicos como material emissor é a compreensão do seu mecanismo de degradação. O principal mecanismo de degradação destes materiais é a dissociação reversível/irreversível entre o átomo metálico central e um de seus ligantes após a excitação da molécula emissora. O complexo de carga formado em decorrência da dissociação irreversível pode ser sensível a campos magnéticos aplicados, através da interação do campo com o elétron desemparelhado. Desta forma, neste trabalho foram avaliados, através de medidas de ressonância paramagnética eletrônica (RPE), os possíveis processos de degradação em sistemas contendo a dispersão de dois compostos organometálicos fac tris(2-fenilpiridina) irídico (ir(ppy)3) e irídio bis(4,6-diflúorfenil)-piridinato-N, C2) picolinato (Flrpic) em diferentes matizes poliméricas como o poliestireno (PS), o poli(9,9-dioctifluoreno-2,7-dil) (PFO) e o polimetilmetacrilato (PMMA). Foi avaliada ainda a influência da molécula doadora de cargas 1,2,4,5-tetracianobenzeno (TCNB) na dispersão Flrpic+PS. Os processos de degradação foram estudados através da análise de diversos parâmetros, como o comportamento do sinal de RPE com a fotoexcitação, processo de relaxação do sinal em diferentes temperaturas e à avaliação do sinal de RPE dos compostos organometálicos puros e nas diferenetes dispersões em matizes poliméticas. Os resultados mostraram que um sinal de RPE relativamento baixo é obtido para o composto Flrpic puro. Entretanto a sua inserção em matrizes poliméricas promoveu um aumento significativo da intensidade do sinal. Dados de absorção e emissão óptica dos compostos evidenciaram que espécies excitadas são inicialmente fotogenadas nos complexos metálicos...
Abstract: Understanding the degradation mechanism of light emitting devices based on organometallic compounds is the major point to improve their life time. The main mechanism of degradation of these materials is the reversible/irreversible dissociation between the central metallic atom and one of its ligands after the excitation of the emiting molecule. The carge complex formed due to the irreversible dissociation may be sensitive to applied magnetic fields through the field interaction with the unpaired electron. Thus, in this study the possible degradation processes in dispersion systems composed by two organometallic compounds Iridium(III)bis(4,6-fluorephenyl)-pyridiano-N, C2]picolinate (Flrpic) and iridium(III)fac-tris(2-phenylpyridine) (Ir (ppy)3) in different polymer matrices (polystyrene (PS), poly(methylmethacrylate) (PMMA) and poly(9,9-dioctylfluorene) (PFO) were analysed through electron paramagnetic resonance (ERP) technique. The influence of a charge donor molecule 1,2,4,5-tetracyanobenzene (TCNB) in Flrpic+PS dispersion was also examined. The processes of degradation were studied by analysing a variety of parameters such as the behaviour or the EPR signal with the photoexcitation, the process of signal relaxation at different temperatures and the evaluation of the EPR signal of pure organometallic compounds and its dispersion in different polymeric matrices. The results showed that a relatively low EPR signal is obtained for pure Flrpic compound. However its insertion in polymeric matrices caused a significant increase in the signal intensity. The optical absorption and emission data have shown that the excited species are initially photogenerated in metal complexes of those compounds, promoting the subsequent formation of paramagnetic centres, close to Indium atom. The energy levels analysis also suggests an exciton trapping process, which were associated with...
Mestre
Zhang, Youwen, Samuel D. Cross, James B. Stanton, Alan D. Marmorstein, Yun Zheng Le i Lihua Y. Marmorstein. "Early AMD-like defects in the RPE and retinal degeneration in aged mice with RPE-specific deletion of Atg5 or Atg7". MOLECULAR VISION, 2017. http://hdl.handle.net/10150/623963.
Pełny tekst źródłaGao, Jiangyuan. "NLRP3 inflammasome activity in RPE : role in AMD pathogenesis". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62512.
Pełny tekst źródłaMedicine, Faculty of
Graduate
Moraes, Itamar Jose. "RPE dos íons Cr3+, Er3+ e Mn2+ em Ca3Ga2Ge3O12". Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-08122014-162605/.
Pełny tekst źródłaIn this work was studied the Electron Paramagnetic Resonance (RPE) of the impurities Cr3+, Er3+ and Mn3+ in Ca3Ga2Ge3O12 single crystals (Known as CGGG) at frequencies of 1.3, 10 and 34 GHz in the temperatures range 4,2K to 300K. Spin Hamiltonian for the Cr3+ íons, located at octahedric position with symetry Cr3i is given by: H = β[g⊥ (HxSx + HySy) + gHzSz] + D (S2z - 1/3 S (S+1). The relevant parameters for CGGG lightly dopped with Cr3+ as determined from the EPR spectra are: g = 1,9662 ± 0,0003, g⊥ = 1,9617 ± 0,0008 and D = 15,82 ± 0,02GHz. CGGG crystals simultaneously dopped with Er3+ and Cr3+ shown the following parameters: g = 1,9662 ± 0,0003, g⊥ = 1,9617 ± 0,0008 e D = 15,82 ± 0,02GHz. Effective spin Hamiltonian parameters for Er3+ íon, located at dodecahedric position and with symetry D2, are: gx = 2,690 ± 0,0005, gy = 4,095 ± 0,005 e gz = 5,082 ± 0,005. Paramagnetic centers Mn2+ produced in Cr3+ dopped crystals, X-ray irradiated, at room temperature, shown the isotropic g-factor g = 2,0066 ± 0,0001 and the hyperfine interaction constant A = 90 Gauss. Also, was measured the temperature dependence of the line width in the three frequency bands, in the range of liquid nitrogen to room temperature. In the case of the X-band, the measurements were extended to lower temperatures, 4.2K to 300K
Schüle, Georg. "Mechanismen und On-line Dosimetrie bei selektiver RPE Therapie /". Berlin : Dissertation.de, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010295155&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Pełny tekst źródłaSantana, Ricardo Costa de. "RPE do ion Fe3+ em monocristais e fibras de LiNbO3". Universidade de São Paulo, 1994. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-09042008-084147/.
Pełny tekst źródłaWe report EPR measurements of Fe3+ ion in bulk LiNbO3 single crystals and in the form of fibers. Spin Hamiltonian for the Fe3+ ion in a trigonal symmetry (C3v) site is given by: H = \'beta\' \'VET.H\' \'VET.g\' \'VET.S\' + \'B20O20+B40O40. Measurements were performed at room temperature and two frequency bands, 10 and 34GHz, using three samples of LiNbO3 with different concentrations of Fe3+ g-factor and the crystal field parameters were found to be: for fiber (0.3 mol% of Fe3+) g = 1.9908 \'+OU-\' 0.0002, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.2x10-2 cm-1 , \'B. SUP. 0 INF. 4\' = -7.7\'+OU-\'1.5x10-5cm-1, for the single crystal 90 (0.22 mol%) g = 2.0043\'+OU-\'0.0002, \'B. SUP. 0 INF. 2\' = 5.35\'+OU \'0.25x10-2 cm-1, \'B. SUP. 0 INF. 4\'= - 4.03\'+OU-\'1.4x10-5 cm-1, and for the single crystal 99 (0.02 mol%) g = 2.0026\'+OU-\'0.0004, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.3x10-2 cm-1, \'B. SUP. 0 INF. 4\' = - 8.33\'+OU-\'1.6x10-5cm-1. The angular dependence of the line width were also measured and compared with theoretical model. To determine the substitutional site of Fe3+ ion in the LiNbO3 lattice, we calculated the zero field splitting parameter \'B. SUP. 0 INF. 2\' of the ground state, using many theoretical models (Watanabe, Orbach-Das-Sharma, Spin-spin, Spin-Spin Spinorbita).
Barbosa-Sabanero, Karla Y. "Dedifferentiation and transdifferentiation: a study of the RPE cell identity". Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1468660645.
Pełny tekst źródłaLu, Tianlin. "Studies on the Mechanism behind Retinal Pigment Epithelium (RPE) Reprogramming". Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1575301308695243.
Pełny tekst źródłaMichel, Philippe. "Synthèse et étude de matériaux organiques à raie RPE étroite". Paris 11, 1989. http://www.theses.fr/1989PA112013.
Pełny tekst źródłaRadical-cation salts derived from polyaromatic donors exhibit very interesting EPR properties. Thus, the linewidth of the material (fluo19 ranthene) 2PF6 is only 10 mG. However, the high thermal instability of these solids has so far precluded industrial applications. Our goal was to obtain stable materials with a narrow EPR line. We assumed that the high oxydation potentials of the substrates was one of the reasons of the instability. We have tried to lower these potentials by an adequate substitution of the aromatic molecules, the effect of this substitution being also to modify dimensionnality of the materials, a factor which would predictibly affect the linewidth. We have prepared two substituted perylenes, using an original synthesis. One of the them, the 3,4,9,10-tetramethylperylene, led to a radicalcation salt, with a 2:1 stoechiometry. The linewidth of this material is 16 mG, its thermal stability is very good up to 80°C. We then attempted to investigate the factors which might be responsible of the narrowing of the line, in this series deriving from perylene. Therefore, we prepared and studied the 2:1 radical-cation salts of perylene itself. We prepared also the 2:1 salt deriving from 1,2,7,8 -tetrahydro [cd;1m]dicyclopentaperylene, which had already been described. The comparison of the structural data allowed us to show unambiguously the beneficial effect of the dimensionnality on the linewidth. It seems possible, adopting the same approach we used for perylene, to obtain materials with still narrower EPR lines by adequatly substituting the suitable substraces. The communication of the contents of this thesis is submitted to the authorization of the Thomson-Sintra ASM company
Gambarelli, Serge. "Etude des proprietes magnetiques et des spectres rpe de biradicaux nitroxydes". Paris 6, 1996. http://www.theses.fr/1996PA066560.
Pełny tekst źródłaCrouigneau, Pierre. "Etudes spectroscopiques (electroréflexion uv-visible, RPE) et electrochimiques de dérivés viologènes". Poitiers, 1989. http://www.theses.fr/1989POIT2003.
Pełny tekst źródłaTheurel, Laurence. "Synthèse et caractérisation de radicaux organiques stables pour la magnétométrie RPE". Grenoble 1, 1993. http://www.theses.fr/1993GRE10199.
Pełny tekst źródłaUzel, Alexandre. "Caractérisation fonctionnelle des formiate-déshydrogénases de Bacillus subtilis par spectroscopie RPE". Electronic Thesis or Diss., Aix-Marseille, 2022. http://theses.univ-amu.fr.lama.univ-amu.fr/220310_UZEL_750yyya237ggtlq644ueoq380vkulm_TH-1.pdf.
Pełny tekst źródłaNowadays one of the biggest environmental challenges is the bioremediation of atmospheric CO2. The biocatalytic reduction of CO2 to formate by microbial formate dehydrogenases (FDHs) is very promising. We present the EPR characterization of two similar FDHs, named ForCE 1 and ForCE 2, from the soil bacterium Bacillus subtilis. These enzymes belong to the Mo/W-bisPGD (i.e. pyranopterin guanosine dinucleotide) superfamily, which is widespread in prokaryotes. These two FDHs appear to be of great scientific interest for several reasons : sequence analyses reveal that their active site harbours non-consensual residues for formate-dehydrogenase activity, defining a new FDH sub-familly not yet characterised. Moreover, the way in which these enzymes are integrated into the metabolism of this organism remains to be established, leaving the door open for new biological discoveries. The catalytic core of ForCEs is composed of two subunits. From sequence analysis, the larger one (ForC) is thought to coordinate five iron-sulfur clusters and a Mo-bisPGD while ForE does not appear to harbor any cofactor. By combining redox potentiometry, multifrequency continuous wave (CW) and pulsed EPR spectroscopy, we were able to characterize the EPR signatures and redox properties of several paramagnetic cofactors in the purified enzymes including at least four FeS clusters (the fifth was detected by spin quantitation) and two MoV species associated to the molybdenum cofactor. An unexpectedly intense radical signal was also detected and could be attributed to a highly stabilized menasemiquinone species based on its redox and spectroscopic properties determined by a multi-frequency EPR approach
Ali, Afaf Mubarak Mohamed. "Accounting for performance : case studies of relative performance evaluation in Egypt and England". Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/19241/.
Pełny tekst źródłaCordes, Magdalena [Verfasser]. "Regulation der Oberflächenexpression von L-Typ-Ca2+-Kanälen im RPE / Magdalena Cordes". Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1196803838/34.
Pełny tekst źródłaArmstrong, Ian. "A study of the transport characteristics of mammalian retinal pigment epithelium (RPE)". Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276870.
Pełny tekst źródłaLaw, A. L. "The role of annexin 2 in RPE phagocytosis of photoreceptor outer segments". Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18708/.
Pełny tekst źródłaBakker, Linda Margaretha. "Peroxidized docosahexaenoic acid causes RPE dysfunction : implications for retinal ageing and AMD". Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54734/.
Pełny tekst źródłaBrasil, Filho Nilson. "Ressonância magnética eletrônica (RPE) e nuclear (RMN) em compostos e hidretos metálicos". [s.n.], 1985. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278166.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Foram realizadas medidas de RMN pulsadas nos hidretos metálicos ZrCr2Hx (x = 2, 3 e 4) e ZrV2Hy (y = 2, 3, 4 e 5) no intervalo de temperatura entre 180K e 400K. Nosso objetivo foi investigar os mecanismos de relaxação nesses hidretos através de medidas dos tempos de relaxação spin-rede (T1) e spin-spin (T2) para o hidrogênio, e obter informações com respeito aos mecanismos de difusão do hidrogênio na rede metálica. Foram obtidas as energias de ativação, as freqüências de salto e a constante Ck, relacionada com a relaxação spin-elétron de condução, para o hidrogênio nos hidretos acima citados. Nossos resultados foram analisados à luz das teorias de relaxação modulada por interação dipolar (modelos de BPP e de Torrey) e da relaxação tipo Korringa (devida aos elétrons de condução) em sistemas metálicos. Na segunda parte desta tese, foram medidos o deslocamento do fator-g e a razão de Korringa nas linhas de RPE dos íons Gd3+, Nd3+ e Er3+ diluídos em compostos intermetálicos AB3 (A = La, Ce, Y, Sc, Th, Zr; B = Rh, Ir, Pt) de estrutura tipo AuCu3. Os resultados de RPE nestas séries de compostos foram analisados em termos do modelo de multibandas em metais, proposto anteriormente por Barberis e outros (1979) para explicar o comportamento dos parâmetros de Ressonância em compostos intermetálicos do tipo fase de Laves AB2
Abstract: Proton pulsed Nuclear Magnetic Resonance measurements were performed on the metallic hydridesZrCr2Hx (x = 2, 3, 4) and ZrV2Hy (y = 2, 3, 4, 5) as a function of temperature between 180 and 400 K. The ultimate aim was the investigation of the relaxation mechanisms in these systems by means of the measurement of both the proton (1H) spin-lattice (T1) and spin-spin (T2) relaxation times and to use these data to obtain information about the diffusive motion of the hydrogen atoms. The diffusional activation energies, the jump frequencies and the Korringa constant, Ck, related with the conduction electron contribution to the 1H relaxation were determined for the above hydrides as a function of hydrogen concentration. Our results were analyzed in terms of the relaxation models described by Bloembergen, Purcell and Pound (BPP models) and by Torrey. The Korringa type relaxation due to conduction electrons in metallic systems was also used to interpret the experimental results. We also present the Electron Paramagnetic Resonance (EPR) study of Gd3+, Nd3+ and Er3+ ions a impurities in several AB3 intermetallic compounds were A = La, Ce, Y, Sc, Th, Zr and B = Rh, Ir, Pt. The results were analyzed in terms of the multband model previously suggested to explain in the behavior of the resonance parameter in AB2 Laves Phase compound
Mestrado
Física
Mestre em Física
Goze-Bac, Christophe. "Contribution à l'étude du fullerène C60 et dérivés : études RMN et RPE". Montpellier 2, 1996. http://www.theses.fr/1996MON20047.
Pełny tekst źródłaOuajahat, Filali Aziz. "Evaluation de la photoréactivité des quinolones antibactériennes par photo-CIDNP et RPE". Lille 1, 1987. http://www.theses.fr/1987LIL10034.
Pełny tekst źródłaFEAUGAS, VALERIE. "Caracterisation des facteurs influant sur l'evolution du signal rpe de l'alanine irradiee". Paris 11, 1999. http://www.theses.fr/1999PA112310.
Pełny tekst źródłaRobert, Jérôme, i J. J. ANDRE. "Magnetisme des fullerenes intercales : etude par rpe en ondes continue et pulsee". Université Louis Pasteur (Strasbourg) (1971-2008), 1995. http://www.theses.fr/1995STR13151.
Pełny tekst źródłaVan, Wichelen Koen. "Etude d'un magnétomètre vectoriel différentiel RPE pour application en puits de forage". Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10244.
Pełny tekst źródłaLane, Brandon. "Otx but not Mitf transcription factors are required for zebrafish RPE development". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2839.
Pełny tekst źródłaSpencer, Samantha A. "The Role of tfec in Zebrafish Neural Crest Cell and RPE Development". VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3754.
Pełny tekst źródłaOuajahat, Filali Aziz. "Evaluation de la photoréactivité des quinolones antibactériennes par photo-CIDNP et RPE". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376085778.
Pełny tekst źródłaPiccinato, Marilene Turini. "Caracterização de vanadila (VO2+) em petróleo através de ressonância paramagnética eletrônica (RPE)". Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Física, 2005. http://www.bibliotecadigital.uel.br/document/?code=vtls000114955.
Pełny tekst źródłaThe samples were analyzed, by the technique of Electron Paramagnetic Resonance (EPR), starting from petroleum of the following countries: Argentina (AR), Saudi Arabia (SA), Colombia (CO), Kuwait (KW), Venezuela (VE) and Brazil. In this last one in the oil fields of Bahia (BA), Basin of Campos (BC), Marlim (B1), Albacora (B2), Cabiúnas (B3), Espadarte (B4), Roncador (B5) and three mixtures (M1, M2 and M3) be used in Brazil for the production of oil derivatives. Amongst paramagnetic species detected in oils by EPR were calculated Spin Hamiltonian parameters of vanadyl (VO2+): anisotropy spectroscopic factor or g-factor and unfolding hyperfine. The value of chemical shift {Ag0 = (2,003 = g0) x 10 3}0 0 10 g 0023 . 2 g × - = . } corresponding to the VO2+ signal in the oils AR, SA, CO, KW, VE, BC, M1, M2, B1, B2, B4 and B5 that are between 0 25 0 . g = . and 0 26 0 . g = . , suggests vanadium complexes of the type VO(N2OS), VO(S2O2) or VO(N3O), while which in M3 and B3 oils, the value of 0 . 27 0 = .g it is characteristic of vanadium complexes of type VO(S2O2) or VO(NSO2). The variations found in the hyperfine interaction parameter ( 0 A ) of the VO2+ EPR signal in petroleum were small (~1%), demonstrating the similarity in the chemical environment of the paramagnetic ion VO2+. The relative intensity of the VO2+ signal revealed that Bahia's Petroleum (BA) has the smallest quantity of ions VO2+, while Argentina's Petroleum (AR) has ~87.3 larger ions vanadyl.
Nogueira, Roberto Alves. "Aquisição de dados em experiências de RPE usando minicomputador de tempo real". Universidade Federal de Minas Gerais, 1990. http://hdl.handle.net/1843/BUOS-97WF8D.
Pełny tekst źródłaDoe, Vicki Haywood. "Effect of Cardiac Rehabilitation in Depressed Versus Nondepressed Individuals on Fitness, Depression, and Perceived Exertion". Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1258921420.
Pełny tekst źródłaYu, Jie. "Classification of Genotype and Age of Eyes Using RPE Cell Size and Shape". Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/math_theses/118.
Pełny tekst źródłaMcFarlane, S. "An investigation of the effect of advanced glycation on age-related RPE dysfunction". Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268450.
Pełny tekst źródłaCATTANI, MARTA M. "Estudo por ressonancia paramagnetica eletronica (RPE) em graos e farinacios irradiados com sup60Co". reponame:Repositório Institucional do IPEN, 1995. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10427.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Clément, Jean-Louis. "Synthèse et études RPE dans la série des pyrrolines n-oxyde b-phosphorées". Aix-Marseille 3, 1998. http://www.theses.fr/1998AIX30096.
Pełny tekst źródłaChevalier, Alain. "Contribution à l'étude par spectroscopie Mössbauer et RPE de la stabilité de l'hémoglobine". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376126926.
Pełny tekst źródłaJacques, Julien. "Réactivité de la nitrate réductase périplasmique étudiée par spectroscopie RPE et électrochimie directe". Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4710/document.
Pełny tekst źródłaRhodobacter sphaeroides periplasmic nitrate reductase catalyses the reduction of nitrate into nitrite. It is a metalloenzyme containing a molybdenum cofactor, an iron - sulfur cluster, and two haems.The reactivity of the molybdenum cofactor remains elusive for many reasons. Among others : the heterogeneity of the EPR signatures of Mo(V), the semi-reduced state of the active site, and the existence of inactive states of the enzyme, depending on conditions.In order to understand the reactivity and the catalytic relevance of the major Mo(V) species, we have undertaken a characterisation of the activation and inactivation processes by protein-film-electrochemistry, and a study of their structure by EPR and HYSCORE spectroscopies.Our kinetic observations suggest that the irreversible activation of the enzyme involves a rearrangement of one of the pterins of the Mo cofactor.This is evidenced by the modification of intercentre magnetic couplings due to the activation, and by structural modifications beyond the first coordination sphere of Mo.Finally, the study of enzyme reversible inactivation by electrochemistry shows the involvement of the different redox states of the active site in the inhibition mechanism, and yields the necessary conditions to trapping active Mo(V) forms
Jacques, Julien. "Réactivité de la nitrate réductase périplasmique étudiée par spectroscopie RPE et électrochimie directe". Electronic Thesis or Diss., Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4710.
Pełny tekst źródłaRhodobacter sphaeroides periplasmic nitrate reductase catalyses the reduction of nitrate into nitrite. It is a metalloenzyme containing a molybdenum cofactor, an iron - sulfur cluster, and two haems.The reactivity of the molybdenum cofactor remains elusive for many reasons. Among others : the heterogeneity of the EPR signatures of Mo(V), the semi-reduced state of the active site, and the existence of inactive states of the enzyme, depending on conditions.In order to understand the reactivity and the catalytic relevance of the major Mo(V) species, we have undertaken a characterisation of the activation and inactivation processes by protein-film-electrochemistry, and a study of their structure by EPR and HYSCORE spectroscopies.Our kinetic observations suggest that the irreversible activation of the enzyme involves a rearrangement of one of the pterins of the Mo cofactor.This is evidenced by the modification of intercentre magnetic couplings due to the activation, and by structural modifications beyond the first coordination sphere of Mo.Finally, the study of enzyme reversible inactivation by electrochemistry shows the involvement of the different redox states of the active site in the inhibition mechanism, and yields the necessary conditions to trapping active Mo(V) forms
Melin, Sofie, i Isabelle Samnell. "Musikens påverkan på fysisk prestation, subjektivt skattad ansträngning och upplevd koncentration : - en studie beträffande musik kontra tystnad vid Coopertest gjord på 32 ungdomar och unga vuxna mellan 15-30 år". Thesis, Uppsala universitet, Fysioterapi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-311575.
Pełny tekst źródłaBackground: Music affect the muscle tension, heart rate, blood pressure and emotions. An increase of positive emotions may result in a better performance. Aim: To explore the impact of music on physical performance measured in time, perceived exertion and perceived concentration and also if the impact differs between the sexes and how physical performance interacts with perceived exertion level. Method: The study was a quasi-experimental single-group study with comparative and correlating design. The sample consisted of 32 individuals with varying experience of running. They were 17 women and 15 men in the age of 15-30 years old. Results: A performance measured in time at the Cooper Test was significantly better with music than without (p = 0.002). It was shown in both women (p = 0.017) and men (p=0.032). There was no significant difference in perceived exertion or perceived concentration in running with and without music. A low to moderate negative correlation was found between perceived exertion and the measured time results at the Cooper Test with (Spearman's rho = -0.37) and without music (Spearman's rho = -0.43). Conclusion: Music tends to increase a performance based on individual physics. This is related to the individuals in this study and can not be directly transferable to other groups. In physiotherapy, music can be an option for patients who find it difficult to train with the desired intensity
SILVA, NETO Leoncio de Barros e. "Caracterização de dosímetros de alanina/RPE para irradiadores de raios-X de baixa energia". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/19638.
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FACEPE
Nos últimos anos, a crescente dificuldade para aquisição e transporte internacional de irradiadores de raios gama, como o irradiador de Co-60 GammaCell 220 da Nordion, levou ao desenvolvimento de irradiadores de altas taxas de dose com base em feixes de raios-X, que operam na faixa de 150kV. Uma das aplicações deste tipo de irradiador é a irradiação de insetos, de amostras de sangue, etc. Para estes procedimentos, é importante que se tenha dosímetros que possam monitorar os processos de irradiação. O objetivo deste trabalho é o estudo e caracterização da alanina para que possa ser aplicada em dosimetria de irradiadores de raios-X de altas taxas de dose. A alanina é um aminoácido com número atômico efetivo próximo ao do tecido humano e é utilizada para dosimetria por ressonância paramagnética eletrônica (RPE) para aplicações em radioterapia. Neste trabalho, foram produzidas pastilhas de alanina com diferentes aglutinantes, bem como pastilhas puras revestidas com duas camadas de verniz, para serem utilizadas como dosímetros. Foram utilizados como aglutinantes parafina, teflon e estearina em concentrações de 1 %, 2 % e 5 % da massa total das pastilhas. Testes mecânicos, como ultrassom e rot-up, foram realizados para avaliar a resistência mecânica das pastilhas produzidas. Após os testes mecânicos, verificou-se que as pastilhas preparadas com alanina pura apresentavam resistência mecânica suficiente para serem utilizadas como dosímetros. A reprodutibilidade de sua resposta RPE foi avaliada a partir da irradiação de dez dosímetros com dose de 100 Gy com uma fonte de Co-60. Para investigar a estabilidade da resposta da alanina-RPE com o tempo, três dosímetros foram irradiados com uma dose de 200 Gy com uma fonte de Co-60, sendo a leitura realizada após cinco horas da irradiação e releituras após 15, 40, 87, 110 e 137 dias da irradiação. Para obter as curvas de calibração para raios gama e raios – X, amostras foram irradiadas, respectivamente, com doses de 0 a 1 kGy e de 18,7 Gy a 206 Gy. Os resultados mostram que a resposta dos dosímetros de alanina-RPE apresentou reprodutibilidade com um coeficiente de variação de 1,2%. O estudo do desvanecimento da resposta dos dosímetros mostrou uma variação de 0,8% em 137 dias. De acordo com os resultados obtidos, o sistema de dosimetria alanina-RPE pode ser utilizado, de forma confiável, como um sistema padrão de transferência para as aplicações do irradiador de raios-X de baixa energia, o RS 2400.
In recent years, the increasing difficulty in acquisition and international transport of gamma ray radiators, as irradiator Co-60 Gammacell 220 of Nordion led to the development of high dose rate irradiators based on X-ray beams that they are operating in the 150kV range. One application of this type of irradiator and irradiation of insects, blood samples, etc. For these procedures, it is important to have dosimeters that can monitor the irradiation processes. The objective of this work is the study and characterization of alanine that can be applied in dosimetry irradiating X-ray of high dose rates. Alanine is an amino acid in effective atomic number close to that of human tissue and is used for dosimetry for electron paramagnetic resonance (EPR) for applications in radiotherapy. In this work, alanine pellets were produced with different binders as well as pure tablets coated with two coats of varnish to be used as dosimeters. They were used as binders paraffin, teflon and stearin in concentrations of 1%, 2% and 5% of the total mass of the pastilles. Mechanical tests, such as ultrasound and rot-up were conducted to evaluate the mechanical strength of the tablets produced. After mechanical testing, it was found that the tablets prepared with pure alanine had sufficient mechanical strength to be used as dosimeters. The reproducibility of EPR response was evaluated from the irradiation ten dosimeters with dose 100 Gy with a source of Co-60. To investigate the stability of alanine EPR response over time of three dosimeters were irradiated with a dose of 200 Gy with a source of Co-60, the reading being performed after five hours of irradiation and readings after 15, 40, 87, 110 and 137 days of irradiation. To obtain the calibration curves for gamma rays and X - ray irradiated samples were, respectively, at doses from 0 to 1 kGy and 18.7 Gy to 206 Gy. The results show that the response of EPR-alanine dosimeters showed reproducibility with a coefficient of variation 1.2%. The study fading dosimeters response showed a variation of 0.8% in 137 days. According to the results, the system alanine EPR dosimetry can be used reliably as a pattern transferring system for irradiating the applications of low-energy X-rays, the RS 2400.
Pritchett, Robert. "RPE "Drift" in Fit and Unfit Males Cycling in a Hot and Cool Environment". TopSCHOLAR®, 2003. http://digitalcommons.wku.edu/theses/562.
Pełny tekst źródłaTao, Qianping. "Characterization and modulation of ionic conductances in cultured rabbit retinal pigment epithelial (RPE) cells". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24762.pdf.
Pełny tekst źródłaRatnayaka, Janaka Arjuna. "Trafficking and processing of variant B cystatin C and endogenous SPARC in RPE cells". Thesis, University of Liverpool, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440770.
Pełny tekst źródłaFaby, Hendrik [Verfasser]. "Temperaturabhängige VEGF Induktion im humanen RPE - Mögliche Bedeutung für die Transpupilläre Thermotherapie / Hendrik Faby". Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/111473506X/34.
Pełny tekst źródłaCeotto, Filho Gino. "RPE dos portadores de carga E Mn2+ em compostos de grafite intercalado com ALCL3". [s.n.], 1987. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277564.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: O objetivo deste trabalho constituiu em preparar compostos de grafite intercalados com AlCl3, com o intuito inicial de, através de experimentos de Ressonância Paramagnética Eletrônica (RPE) em função da temperatura, tentar, pelo acompanhamento dos espectros de ressonância dos portadores de carga e da impureza magnética, caracterizar melhor o tipo de transição de fase observadas nestes sistemas. Experimentos de RPE em função da temperatura (T = 4,2K e 90 £ T £ 375K) realizados no composto intercalado de estágio 2, tivemos oportunidade de observar pela primeira vez, paralelamente com Ressonância de Spin dos Portadores de Carga (RSPC), o espectro de estrutura fina e hiperfina, completamente resolvido, do íon Mn2+ numa matriz metálica. Os resultados mostraram que os íons Mn2+ estão localizados num campo cristalino de simetria axial, com o eixo de simetria perpendicular às camadas de carbono. O parâmetro de segunda ordem de campo cristalino (D) aumentou com a temperatura, comportamento este contrário ao usualmente observado em isolantes. Já o "splitting" hiperfino mostrou ser independente da temperatura. O alargamento da ressonância do Mn2+ observada para T > 200K permitiu-nos extrair a dependência para altas temperaturas (200K < T < 375K) do tempo de relaxação spin-rede (T1). Através do método do fator de saturação da ressonância medimos T1 a 4,2K. Uma mudança brusca no valor de g e na largura da linha da ressonância dos portadores de carga, como também na intensidade e parâmetro D do íon Mn2+ , para T @ 200K, sugere a existência de uma transição de fase a esta temperatura
Abstract: Not informed.
Mestrado
Física
Mestre em Física
Santos, Adevailton Bernardo dos. "Estudo preliminar de RPE em banda K de esmalte dental e hidroxiapatita sintética irradiados". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-26012007-213607/.
Pełny tekst źródłaHydroxyapatite and tooth enamel are, nowadays, some of materials mostly investigated by the spectroscopic technique of Electron Paramagnetic Resonance ? EPR. Tooth enamel, that have about of 97% of its mass constituted by hydroxyapatite crystals, appears itself as the preferential human tissue for radiation dosimetry using EPR, mainly in case of accidental expositions by ordinary personnel. The analyses of synthetic hydroxyapatites have as the main goal to help the understanding of tooth enamel?s spectrum seeking the developing of a radiation dosimeter with good efficiency and accuracy. The K-band EPR spectrometer uses an intermediate frequency between the spectrometers in X-band and Q-band, possessing a better resolution than the X-band without presenting the Q-band?s difficulties. In this preliminary work the EPR spectra of a small block tooth enamel and synthetic hydroxyapatites irradiated were analyzed in K-band, comparing the results with X- and Q-band with published results, the possibility of performing radiation dosimetry at K-band was verified.
Marque, Sylvain. "Production et études par RPE de radicaux phosphoranyle persilyles : applications en polarisation dynamique nucléaire". Aix-Marseille 3, 1996. http://www.theses.fr/1996AIX30103.
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