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Dissertations / Theses on the topic 'LEC'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

Rodríguez, Domínguez Fernando. "De Neutral a Overperform: el impacto de las finanzas en el crecimiento económico." Thesis, Universidad de las Américas Puebla, 2010. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/rodriguez_d_f/.

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2

Verón, Celayeta Rodrigo Ignacio. "Educación Financiera, Endeudamiento y Salud: Una Revisión de Literatura." Thesis, Universidad de las Américas Puebla, 2010. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/veron_c_ri/.

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3

Moreno, Islas Lizzeth. "Los Costos del Programa Especial de Cambio Climático en México: Un Análisis de Equilibrio General." Thesis, Universidad de las Américas Puebla, 2010. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/moreno_i_l/.

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4

S��nchez, Tello Jorge Carlos. "Inversi��n, flujos de capital y tipo de cambio real en Chile." Thesis, Universidad de las Am��ricas Puebla, 2012. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/sanchez_t_jc/.

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5

Mendoza, Romero Carlos Alonso. "Las malas prácticas bancarias en México. Un caso de estudio." Thesis, Universidad de las Américas Puebla, 2012. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/mendoza_r_ca/.

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El presente trabajo, tiene como finalidad mostrar como los sectores de menores ingresos tienen que enfrentar exclusión bancaria, altas comisiones, baja oferta de productos y servicios financieros, poca presencia de intermediarios financieros formales, información incompleta e incorrecta y malas prácticas. En primer lugar, se mostrará la estructura, la situación y el tamaño del sistema financiero; en segundo lugar, utilizar como ejemplo la estrategia de mercado de un grupo financiero, para demostrar que existe exclusión de los segmentos más bajos, así como incentivos a incurrir en malas prácticas. Con esto, también demostrar que adquirir un crédito en México, representa un costo alto para los clientes en términos financieros, de calidad en el servicio y de riesgo por malas prácticas.

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6

Flores, Villegas Víctor Manuel. "Los Bancos Tienda en México." Thesis, Universidad de las Américas Puebla, 2012. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/flores_v_vm/.

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7

Bedolla, Bautista María Brenda, and Rio Bracamontes Paola Alejandra del. "La falta de atención de los consumidores favorece la compra, así como la poca información transparente por parte de las empresas." Thesis, Universidad de las Américas Puebla, 2013. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/bedolla_b_mb/.

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8

Barnett, S. J. "Structural characterisation of semi-insulating LEC gallium arsenide." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6850/.

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Double crystal x-ray topography using a synchrotron radiation source has been used to measure the lattice distortions present in 50mm diameter samples of (001) semi-insulating LEG gallium arsenide. Lattice strains and tilts have been mapped in In-doped and undoped samples as well as annealed and unannealed samples taken from the seed and tail ends of boules. The properties of the x-ray source which are necessary for these measurements are discussed and it is concluded that a synchrotron source is the only practical choice. Lattice strains of 90ppm and tilts greater than 100 arc seconds were measured in In-doped material both of which appear to be due to a combination of In concentration variations and the inhomogeneous dislocation distribution. Undoped samples were found to be more uniform with lattice strains of typically +20ppm towards the samples edges where the dislocation density is largest. The lattice tilt distribution in seed and undoped samples invariably exhibited a four-fold symmetry which was enhanced by the presence of lineage features lying along the <110> directions. Tail end samples were generally less uniform in lattice strain and showed a lower symmetry in their lattice tilts. These results are discussed in the light of current ideas concerning the origin of variations in lattice strain and EL2 concentration. An x-ray diffraction method involving integrated intensity measurements of the quasi-forbidden 200 reflection, which is highly stoichiometry sensitive, is investigated. The results, however, show no conclusive stoichiometry variations but do highlight important experimental conditions which must be satisfied if such measurements are to be meaningful. The images of dislocations in double crystal x-ray topographs are investigated and compared with theoretical simulations in order to assess the effects of point defect environment on the dislocation strain field. The results suggest that the EL2-dislocation interaction is not significantly strain driven.

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9

Bakeer, Muna. "Radiative heat transfer in gallium arsenide lec crystal pullers." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29916.

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A numerical analysis of radiative heat transfer in a liquid encapsulant Czochralski gallium arsenide crystal puller is developed. The heat transfer and equivilent ambient temperature of each surface element are calculated using the Gebhart radiative model. The effective ambient temperature, to which each surface element is radiating, is found to vary indicating that assuming a constant ambient temperature for all surfaces (simplified radiative model) is incorrect. The importance of including the middle and top cylinders of the growth chamber in numerical analysis of radiative heat transfer in the system is evaluated in the study. The upper section could be replaced by one isothermal surface without significant change of the effective ambient temperature distribution. Fluid flow and heat transfer in the GaAs melt, crystal and encapsulant are calculated using a three dimensional axisymmetric finite difference code which includes the detailed radiative model. The mathematical modelling of the fluid and heat flow describes steady state transport phenomena in a three dimensional solution domain with latent heat release at the liquid/solid interface. The predicted flow and temperature fields using the detailed radiative model differ considerably from the predicted fields using the simplified model. The simplified model shows high axial and low radial temperature gradients in the crystal near the encapsulant region; the axial gradient decreases and the radial gradient increases with increasing distance from the encapsulant top. The detailed model shows a high radial temperature gradient in the crystal near the crystal-encapsulant-ambient junction and nearly flat isotherms in the top half of the crystal.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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10

Poirier, Rémi. "GaInAs channel MISFETs fabricated on LEC-grown ternary GaInAs substrates." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0028/MQ37612.pdf.

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11

Stoakes, R. C. "An investigation of the annealing of LEC semi-insulating GaAs." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381230.

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12

Reddy, Shailendra N. "A mathematical simulation of ETS' limestone emission control (LEC) process using a moving bed configuration." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183736591.

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13

Schvezov, Carlos Enrique. "Temperature and dislocation stress field models of the LEC growth of gallium arsenide." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27525.

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The temperature fields and resulting stress fields have been calculated for a growing GaAs crystal produced by the LEC process. The calculations are based in a finite element numerical thermoelastic stress analysis. The calculated temperature fields have been compared to reported experimental measurements with good agreement. The stress fields have been used to calculate the resolved shear stresses, in the growing crystal, from which the dislocation density and distribution were determined. Using the model the effects of a range of growth and environmental parameters on the dislocation density and distribution were determined. Theses parameters include crystal length, crystal diameter, cone taper, boron oxide thickness, gas pressure, solid/liquid interface shape, vertical temperature gradients and others. The results show that the temperature distribution in the gas surrounding the crystal, and the boron oxide thickness, were critical factors in determining the dislocation density and distribution in the crystal. The crystal radius, crystal length and interface curvature also strongly influenced the dislocation configuration. After crystal growth, the dislocation density at the end of the crystal was strongly influenced by the cooling procedure adopted. The dislocation distribution on cross-sections of the crystal exhibited two-fold, four-fold and eight-fold symmetry depending on growth and cooling conditions and position in the crystal.
Applied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate

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14

Lima, Claudio Ribeiro. "Construção e caracterização de lasers semicondutores sintonizaveis por cavidades externas longas (LEC Lasers)." [s.n.], 1991. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261383.

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Orientador: Evandro Conforti
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenhaa Eletrica
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Resumo: Apresenta-se a construção e caracterização de um laser semicondutor por montagem em cavidade externa longa (LEC Laser) sintonizada por grade de difração. Inicialmente efeito um estudo dessas fomes ópticas onde são feitas considerações sobre configurações, estabilidade em freqüência e operação que elas necessitam possuir para serem usadas em sistemas de transmissão coerente por fibras ópticas. Descrevem-se e caracterizam-se os componentes ópticos do dispositivo (lasers, grade de difração, objetiva de colimação, fibra óptica com microlente), bem como seus circuitos eletrônicos de estabilização de temperatura epolarização. É também introduzido um método "in loco" para caracterização dos componentes passivos da cavidade externa. Em seguida, caracteriza-se o desempenho de um LEC Laser sintonizável operando em 1300 nm, sendo abordados parâmetros como seletividade, sintonia e estabilidade em freqüência. Por fim, faz-se uma análise computacional envolvendo os parâmetros da cavidade construída
Abstract: The design and measurements of a long external cavity semiconductor laser (LEC Laser) that can be tuned by a diffraction grating are presented. Initially, it has been considered the optimum performance of various cavity designs for coherent fiber optic communication. Following this analysis, there are the description and characterization of optical components (lasers, diffraction gratings, microlensed fiber) and oftlie electronic circuits for laser bias and temperature stabilization. Also, a method for local characterization of passive components inside the cavity is introduced. Then, it is shown the experimental results of a LEC laser operating in 1300 nm, including its tuning range and its frequency selectivity. Finally, a computer analysis for this LEC laser is presented
Mestrado
Mestre em Ciências

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15

Santos, Ana Paula Loures dos. "A fala privada no processo de ensino-aprendizagem da língua inglesa para crianças entre quatro e cinco anos em uma escola internacional." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/8/8147/tde-24112016-125246/.

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A fala privada, de acordo com Wertsch (1980), é definida como um diálogo que o indivíduo promove consigo mesmo e sua função recai na necessidade da autorregulação, autodirecionamento e autorreflexão. Os estudos sobre fala privada de crianças e adultos foram pesquisados por McCafferty (1994), Berk & Spuhl (1995), Fernyhough & Russell (1997), Krafft & Berk (1998), Winsler, Carlton, Barry (2000), Manfra & Winsler (2006), Smith (2007), Day & Smith (2013), entre outros. Entretanto, o estudo da fala privada não foi investigado pelas pesquisas de Língua Estrangeira para Crianças (LEC) no Brasil. Dessa forma, essa pesquisa de mestrado se insere na lacuna existente na falta de estudos sobre a fala privada como uma importante ferramenta cognitiva no processo de ensino-aprendizagem da Língua Inglesa (LI). Nos estudos do LEC e de ensino-aprendizagem de língua estrangeira em geral, a língua é considerada somente uma fonte de comunicação. O propósito desse estudo foi verificar como a fala privada ocorre, quais suas funções e frequência. Para tanto, nove crianças entre quatro e cinco anos de diferentes nacionalidades e línguas maternas em uma escola internacional foram gravadas durante as atividades de Circle Time e Phonics. De acordo com os dados coletados, na análise quantitativa, cada fala foi classificada em fala privada ou fala social com o propósito de descobrir qual criança produziu mais fala privada. Na análise qualitativa havia a necessidade de considerar o ambiente social da crianças para descrever quando a fala privada ocorreu, sua função e frequência. Por exemplo, existem crianças que são expostas a três ou mais línguas estrangeiras ao mesmo tempo em casa e na escola, algumas somente falam em inglês na escola e português em casa e outras falam inglês e português na escola e em casa. Os resultados mostraram que a fala privada foi importante na promoção da autorregulação durante o processo de ensino-aprendizagem das crianças analisadas. Ela desempenhou um papel importante no engajamento das crianças quando estavam aprendendo os sons e as palavras na língua inglesa. Além disso, a fala privada demonstrou uma participação efetiva das crianças durante as atividades mesmo aparentemente não sendo ouvidas pelo professor.
Private speech, according to Wertsch (1980), is defined as a private dialog that the individual promotes with himself and its function lies in the necessity of self-regulation, self-guidance and self-reflection. Private speech of children and adults has been extensively studied by McCafferty (1994), Berk & Spuhl (1995), Fernyhough & Russell (1997), Krafft & Berk (1998), Winsler, Carlton, Barry (2000), Manfra & Winsler (2006), Smith (2007), Day & Smith (2013) and others. In Brazilian research, a gap could be identified regarding the study of private speech in English as a Foreign Langague for Children (LEC) as an important cognitive tool for the teaching-learning process. In these Brazilian studies, language is considered only a source for communication. The purpose of this study was to verify how private speech occured, what was its function and frequency. For this reason, nine children between four and five years old from different nationalities in an international school were voice and video recorded during the activities of Circle Time and Phonics. According to the data collected, in the quantitative analysis, each speech was classified as private speech or social speech in order to count which child produced more private speech. In the qualitative analysis there was the necessity to consider the childs environment in order to describe when private speech occured, its function and frequency. For instance, there are children that are exposed to three or more languages at the same time at home and at school, some only speak English at school and Brazilian Portuguese at home and others speak English and Brazilian Portuguese at home and at school. The findings of this study showed that private speech was important for promoting self-regulation in the teaching-learning process of the children analysed. It also played an important role in children engajament when learning the sounds and the words in English. Besides that, private speech showed an effective involvement of the children during the activities even though they were not heard, apparently, by the teacher.

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16

Ivashkevich, Alesia. "Investigation into the cellular radiosensitivity of the LEC rat and analysis of candidate genes." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-98087.

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17

Kidd, P. "The study of defects in LEC GaAs using the transmission infrared laser scanning microscope." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670318.

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18

Mengel, Andreas K. C. [Verfasser]. "Bis(tridentate) polypyridyl transition metal complexes for DSSC and LEC applications / Andreas K. C. Mengel." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1139215035/34.

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19

Julve, Hernández María del Mar. "La protección jurídico-civil de la persona que sufre enfermedad mental: el internamiento urgente no voluntario." Doctoral thesis, Universitat Jaume I, 2017. http://hdl.handle.net/10803/460908.

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El internamiento no voluntario por razón de trastorno mental se estudia inicialmente desde una perspectiva histórica y sociológica de la enfermedad mental, analizando las principales sentencias del TEDH y TC y los instrumentos internacionales sobre los derechos del sujeto afectado. Tras la Constitución Española y derogación del el art. 211 del CC, los procedimientos ordinarios y urgente de internamiento se regulan en el art. 763 de la LEC, siendo objeto de estudio pormenorizado su naturaleza jurídica, su objeto y los principios que lo rigen. Así como la competencia judicial, las partes, la intervención del MF, la prueba la resolución, los recursos y el posterior control judicial. Pero además el ingreso produce una serie de efectos tanto en la vida como en patrimonio del paciente lo que da lugar al planteamiento de alternativas y cuestiones de interés práctico como el TAI.

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20

Nazari, Saeid. "ASSESSMENT OF WATERSHED NUTRIENT LOADS AND EFFECTIVENESS OF BEST MANAGEMENT PRACTICES." UKnowledge, 2018. https://uknowledge.uky.edu/ce_etds/63.

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Several methods have been developed for use in estimating the water quality loads associated with urban and agricultural landuses and practices. These include the use of sophisticated computer models, typically based on using pollutant loading and runoff functions, regression equations, load export coefficients (LECs), and event mean concentrations (EMCs). This research has examined the feasibility of using a simple EMC approach with the Kentucky Nutrient Model (KYNM). The thesis includes an extensive literature review of EMCs and a synthesis of recommended values for a range of typical urban and agricultural landuses. The thesis also includes an extensive literature review of potential BMPs along with a summary of the typical removal efficiencies and costs associated with each type of BMP. The research also explored the potential to use the results from multiple applications of site specific BMP models like the Source Loading and Management Model (WinSLAMM) in the development of general functional relationships that could then be used to evaluate BMP performance on a more site-specific basis. The developed EMC table and the associated BMP performance curves should provide valuable tools for use in better managing nutrient loads for urban and agricultural watersheds.

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21

Steinegger, Thomas. "Defect-Engineering - kontrollierte Einflussnahme auf anwendungsbezogene Defekte in SI-LEC-GaAs unter Berücksichtigung von für Bauelemente relevanten Substratparametern." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=965045684.

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22

Steinegger, Thomas. "Defect engineering : kontrollierte Einflußnahme auf anwendungsbezogene Defekte in SI-LEC-GaAs unter Berücksichtigung von für Bauelemente relevanten Substratparametern /." [S.l. : s.n.], 2001. https://fridolin.tu-freiberg.de/archiv/html/PhysikSteineggerThomas897348.html.

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23

Marquez-Quinones, Adriana. "Reactive oxygen species, hepatitis and carcinogenesis initiation : an integrative approach combining transcriptomic and metabonomic profilings." Toulouse, INSA, 2007. http://eprint.insa-toulouse.fr/archive/00000181/.

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Le stress oxydant et l’inflammation jouent un rôle important dans le développement du cancer. Les modèles animaux, comme le rat LEC, qui est muté sur un gène en relation avec l’excrétion hépatique du cuivre et qui développe spontanément une hépatite puis un carcinome hépatocellulaire, sont des outils intéressants pour comprendre la relation existant entre inflammation, stress oxydant et initiation du cancer. L’expression des gènes et les profils métaboliques des rats LEC à différentes étapes de l’hépatite ont donc été comparés à ceux de rats LEC contrôles, traités par un chélateur du cuivre, de façon à pouvoir mettre en évidence les familles de gènes et les ensembles métaboliques impliqués dans l’inflammation et l’initiation de la cancérogenèse hépatiques. Les analyses statistiques multivariées, couplées à l’utilisation des bases de données d’ontologie des gènes a permis de mettre en évidence une sur-représentation et une augmentation de l’expression des gènes impliqués dans le protéasome avec l’hépatite. Cependant, certaines activités du protéasome ont été parallèlement diminuées. L’hypothèse de l’intervention du protéasome dans la pathogenèse de l’hépatite est nouvelle. Les analyses métabonomiques réalisées à partir des profils 1H-RMN urinaires et hépatiques ont permis d’identifier des métabolites associés au développement de l’hépatite. De plus, grâce à une régression PLS2, nous avons établi une relation canonique entre les données transcriptomiques et métabonomiques du foie. La relation linéaire obtenue entre les deux jeux de données a montré que l’expression des gènes et les perturbations métaboliques pouvaient être corrélées en fonction du développement de l’hépatite. Ces données corrélées pourront servir à formuler d’autres hypothèses concernant les mécanismes impliqués dans le développement de l’hépatite et du cancer du foie. Ce travail constitue une approche originale et fonctionnelle qui illustre la puissance des analyses statistiques multivariées pour analyser les données provenant des technologies en omique et qui permet de formuler des hypothèses rationnelles
Oxidative stress and inflammation play an important role in the development of cancer. Animal models, such as LEC rats, which have a mutation related to hepatic copper excretion and develop spontaneously an hepatitis and a subsequent hepatocellular carcinoma, are useful tools to study the relationship between oxidative stress, inflammation and initiation of cancer. Gene expression and metabolic profiles of LEC rats at different stages of hepatitis were compared to those of control LEC rats treated with a copper chelating agent, to evaluate the different gene families and metabolic networks involved in liver inflammation and carcinogenesis initiation. Multivariate statistical analyses coupled to gene ontology classification of transcriptomic data revealed an overrepresentation and an increase in the expression of genes involved in protein metabolism-related functions, mainly proteasome genes, with hepatitis. However, some proteasome activities were decreased at the same time. Involvement of proteasome in hepatitis pathogenesis is a new hypothesis. Metabonomic analyses done on 1H NMR profiles from urine and liver samples allowed to identify some metabolites related to hepatitis development. PLS2 regression was made to determine a canonical relationship between liver metabonomic and transcriptomic data. The linear correlation obtained indicated that both gene expression and metabolic perturbations are closely related face to hepatitis development. These correlated data will help making new hypotheses for mechanisms involved in liver inflammation and cancer. We present here an integrative analysis of hepatitis development and cellular responses due to oxidative stress. Our work shows an original and functional way of analysis that illustrates the power of multivariate statistical tools to explore omic data and to raise rational biological hypothesis

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24

Cai, Muzhi. "Hybrid materials based on inorganic glasses doped with organophosphorus molecules for light emitting electrochemical cell applications." Thesis, Rennes, INSA, 2019. http://partages.insa-rennes.fr/share/page/document-details?nodeRef=workspace://SpacesStore/cc6fb318-d6f8-4126-8db4-a2a825a605a7.

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La cellule électrochimique électroluminescente (LEC) est un dispositif à couches minces, composé d’un semi-conducteur organique électroluminescent (OSC) et d’ions mobiles en tant que matériau actif intercalé entre une anode et une cathode. Dans le premier chapitre, le contexte et le mécanisme de la LEC ont été introduits. Dans le deuxième chapitre, nous avons dopé la molécule organophosphorée dans un verre de silicate contenant une teneur élevée en lithium par la méthode sol-gel. Dans le troisième chapitre, nous avons travaillé à l’obtention d’un verre de phosphate dopé à une molécule organophosphorée avec une conductivité ionique élevée par frittage Spark Plasma Sintering (SPS). Un verre de phosphate hybride ayant une conductivité ionique d'environ 10 -7 S / cm a été obtenu et une forte photoluminescence a été observée. En outre, les propriétés électrochimiques ont également été étudiées. De plus, lors du processus de préparation de la LEC par SPS, un phénomène intéressant a été découvert. Une émission bleue à large bande a été observée dans le verre d’oxynitrure de phosphate de zinc exempt de terres rares. Le quatrième chapitre est consacré à ce phénomène
The light-emitting electrochemical cell (LEC) is a planar layered device, which is comprised of an electroluminescent organic semiconductor (OSC) and mobile ions as the active material sandwiched between an anode and a cathode. Electrolyte is one of the “short slab” of LEC technology. The main objective of this work is developing a new LEC device based on organophosphorus molecule doped organic-inorganic hybrid glass electrolyte. This hybrid glass cannot be synthesized by using classic melt-quenching technique because the melting temperature of glass is always much higher than the degradation temperature of organic molecule. Thus, in this work, we devote to that how to dope the organophosphorus molecule into the glass with high ionic conductivity. In first chapter, the background and mechanism of LEC were introduced. In the second chapter, we attempted to dope the organophosphorus molecule into silicate glass containing high lithium content by sol-gel method. In third chapter, we are working to obtain organophosphorus molecule doped phosphate glass with high ionic conductivity through spark plasm sintering (SPS). A hybrid phosphate glass with ionic conductivity of around 10 -7 S/cm was obtained, and strong photoluminescence was observed. Besides, the electrochemical properties were investigated as well. Moreover, during the process of preparing the LEC by SPS, an interesting phenomenon was found. A broadband blue emission was observed in rare-earth free zinc phosphate oxynitride glass. The fourth chapter is focus on this interesting phenomenon

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25

Gonçalves, Maria Helane Rocha Batista. "Análise da associação dos marcadores cagT, LEC e oipA funcional e não funcional do Helicobacter pylori em afecções gástricas." reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/22031.

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GONÇALVES, M. H. R. B. Análise da associação dos marcadores cagT, LEC e oipA funcional e não funcional do Helicobacter pylori em afecções gástricas. 2015. 65 f. Tese (Doutorado em Farmacologia) - Faculdade de Farmácia, Odontologia e Enfermagem, Universidade Federal do Ceará, Fortaleza, 2015.
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The Helicobacter pylori is a bacterium that colonizes the gastric mucosa of human beings. The chronic infection caused by this pathogen is strongly associated with an increased risk for gastric illnesses different, ranging from chronic gastritis and peptic ulcer for two types of gastric cancer, adenocarcinoma and lymphoma of the lymphoid tissue associated to mucosa. The aim of this study was to evaluate the association of cagT markers, LEC, functional and nonfunctional oipA in patients with disorders of gastritis, ulcers and stomach cancer. Genotyping of the strains was performed by PCR. Were evaluated 181 patients attended at the University Hospital Walter Cantídio, 87 (48.1%) men, 94 (51.9%) women, with ages ranging from 18-90 years, mean age of 53 + 17.8 years, with a positive diagnosis for H. pylori infection, these 48 carriers of gastric cancer, 69 patients with peptic ulcer and 64 with gastritis. The prevalence of the genotypes studied was: 145/181 (80.1%) cagT, 83/181 (45.9%) LEC 81/181 (44.7%) oipA and oipA"on"34/81.In the group of patients with gastric cancer was observed that the most frequent genotype was the cagT 43/48 (89,5%), followed by the oipA gene "on" 10/18 (55.6%) and LEC 17/48 (35.4%). In the group of patients with peptic ulcer genotype was the most frequent cagT 62/69 (89.8%), followed by gene LEC, 34/69 (49.3%) and the oipA"on" 13/31 (41.9%). In the group of patients with the most frequent genotype gastritis was cagT 40/64 (62.5%), followed by gene LEC 32/64 (50.0%) and the oipA "on" 11/32 (34.4%). Furthermore, by the presented data there is no association of H. pylori and gender and or age of the patients.The genetic study of the markers of H. pylori infection and its relationship with the gastric disorders is essential to establish the profile of virulence of strains and thus elucidate the clinical outcomes variables involved with this infection.
O Helicobacter pylori é uma bactéria que coloniza a mucosa gástrica de seres humanos. A infecção crônica causada por este patógeno está fortemente associada a um risco aumentado de doenças gástricas diferentes, variando de gastrite crônica e úlcera péptica para dois tipos de câncer gástrico, adenocarcinoma e linfoma do tecido linfóide associado à mucosa. O objetivo do presente estudo foi avaliar a associação dos marcadores cagT, LEC e oipA funcional e não funcional em pacientes portadores das afecções gastrite, úlcera e câncer gástrico.Foi realizada a genotipagem das cepas por meio da técnica de PCR. Foram avaliados 181 pacientes, atendidos no Hospital Universitário Walter Cantídio, sendo 87(48,1%) homens, 94(51,9%) mulheres, com idade variando de 18-90 anos, com média de 53 + 17,8 anos, com diagnóstico positivo para a infecção por H. pylori. Destes, 48 portadores de câncer gástrico, 69 pacientes com ‘úlcera péptica e 64 com gastrite. A prevalência dos genótipos estudados foi: 145/181 (80,1%) cagT, 83/181 (45,9%) LEC, 81/181 (44,7%) oipA, e oipA“on”34/81 (41,9%).No grupo dos pacientes com câncer gástrico observou-se que o genótipo mais frequente foi o cagT 43/48 (89,6%), seguido do gene oipA “on” 10/18 (55,6%) e LEC 17/48 (35,4%). No grupo dos pacientes com úlcera péptica o genótipo mais frequente foi o cagT 62/69 (89,8%), seguido do gene LEC; 34/69 (49,3%) e oipA”on” 13/31 (41,9%). No grupo dos pacientes com gastrite o genótipo mais frequente foi cagT 40/64 (62,5%), seguido do gene LEC 32/64 (50,0%) e oipA “on” 11/32 (34,4%). Não houve associação significativa dos genótipos do H. pylori com gênero, nem com faixa etária dos pacientes. O estudo genético dos marcadores de H. pylori e sua relação com as afecções gástricas é fundamental para se estabelecer o perfil de virulência das cepas e assim elucidar os variáveis desfechos clínicos envolvidos com essa infecção.

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Wei, Lun-Cun. "Etude de l'incorporation de b, c et o dans gaas prepare par la methode de czochralski (lec), en utilisant l'analyse par activation avec les particules chargees." Paris 6, 1987. http://www.theses.fr/1987PA066031.

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L'incorporation de b et c est d'autant plus faible que la teneur en eau de l'encapsulant (b::(2)o::(3) fondu) est plus grande. B et o segregent toujours en queue de lingot, alors que c segrege en tete dans les lingots riches en gallium et en queue dans les lingots riches en arsenic. Par ailleurs, le coefficient de segregation de b, tout en restant toujours inferieur a 1, prend des valeurs differentes suivant la stoechiometrie de la charge initiale. Ces resultats ouvrent la voie, en relation avec des mesures complementaires (electriques, optiques), d'etudes permettant de preciser l'influence de b, c et o sur les proprietes electroniques de gaas

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Wei, Lun-Cun. "Etude de l'incorporation de B, C et O dans GaAs préparé par la méthode de Czochralski (LEC), en utilisant l'analyse par activation avec les particules chargées." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37610724h.

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Nahid, Masrur Morshed. "In Quest of Printed Electrodes for Light-emitting Electrochemical Cells: A Comparative Study between Two Silver Inks." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-62827.

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This thesis presents a comparative study between two silver nanoparticle inks that were deposited using a Drop-on-Demand (DoD) inkjet printer, aiming at finding a functional ink that can be used to print electrodes in Light-emitting Electrochemical Cells (LECs). To achieve this, a DoD inkjet printer was installed and an acquaintance with the printer was attained. Among the two inks, one was employed as received while the other was reformulated, and successful deposition of both the inks was observed. During the reformulation process, it was seen that the highly volatile tetrahydrofuran (THF) solvent can be used to improve the ink properties, in contrast to what is recommended. After that, the inks were deposited on UV-ozone treated glass substrates, sintered at an elevated temperature under ambient conditions, and their specific resistances and thicknesses were measured. Finally, the inks were used to print the anode in a structured sandwich-cell LEC. The performance comparison was conducted by observing the emitted light of the LECs. The results indicate that the reformulated ink performs better, probably due to the lower silver concentration that results in flatter surface, which in turn effectively alleviates shorts.

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HU, Yufeng. "ELECTRICAL AND OPTICAL PROBING OF EXTREMELY LARGE PLANAR POLYMER LIGHT-EMITTING ELECTROCHEMICAL CELLS." Thesis, 2011. http://hdl.handle.net/1974/6513.

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Polymer light-emitting electrochemical cells (LECs) are unique solid-state light-emitting devices operating on the principle of in situ electrochemical doping and the formation of a p-n junction. Compared to conventional polymer light-emitting diodes, LECs possess some favorable device characteristics, making them attractive candidates for flat panel display applications. However, the underlying operating mechanism of LECs has been the subject of intense scrutiny and debate. The extremely large planar devices demonstrated by Dr. Gao’s group offer an unparalleled spatial resolution for investigating the electrochemical doping process. With time-lapse fluorescence imaging, our group has demonstrated the existence of the electrochemical doping and the p-n junction in an operating LEC. However, the LEC electronic structure has never been adequately studied and understood. In this thesis, the original research on the electrical and optical scanning measurements on extremely large planar LECs is described. A fresh LEC film has, for the first time, been turned on to form a light-emitting p-n junction by biasing a pair of probes that form direct contacts with the LEC film. The quasi-one-dimensional probe tips allow insight into the electrochemical doping mechanism, without being disturbed by imperfections in the pre-deposited electrodes. Time-lapse fluorescence imaging has exhibited p- and n-doping of various shapes and shades, p-n junction electroluminescence, and the effects of bias reversal. The observed doping reaction kinetics suggests that n-doping is reaction-limited whereas p-doping is diffusion-limited. Furthermore, the electric potential and conductivity distributions of extremely large planar LECs have been mapped. The results show that the p-doping is more conductive than n-doping. More importantly, The results provide the first evidence that the p-n junction is indeed a graded one with decreasing conductivity and doping concentration from the electrode contact to the metallurgical junction. In addition, the optical beam induced current (OBIC) measurement has been explored to map the built-in electric field of extremely large planar LECs. This result clearly shows that a large electric field exists only around the junction region rather than in the electrode region. Moreover, the result confirms that the LEC electronic structure is a graded p-n junction.
Thesis (Ph.D, Physics, Engineering Physics and Astronomy) -- Queen's University, 2011-05-12 16:27:05.208

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"Explicando el boom de las exportaciones textiles mexicanas de los 90´s. Un análisis de series de tiempo." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/ramirez_h_o/.

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"Gasto público y pobreza. El caso de México 1992-2002." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/rodriguez_v_jj/.

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"Determinantes de la Autonomía Fiscal Local: “El Caso de México”." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/zorrilla_r_ga/.

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"Libertad, crecimiento y calidad ambiental: desarrollo económico y cambio climático." Tesis, Universidad de las Américas Puebla, 2003. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/enriquez_v_ah/.

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"Determinantes de la migración en México: un enfoque de econometría espacial." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/lara_i_gd/.

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"Efecto de la eliminación de la exención del impuesto al activo en la industria maquiladora de exportación." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/felix_m_a/.

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"Inequidad de género y desarrollo humano: el caso de México." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/robles_s_c/.

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"Definiendo la Reforma Eléctrica: Opciones, Ganadores y Perdedores." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/corral_s_h/.

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"Efectos del Tratado de Libre Comercio de América del Norte sobre las exportaciones mexicanas de café oro a Estados Unidos, 1970-2003." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/minor_b_i/.

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"Migración Interna y Capital Humano en México." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/nocedal_d_m/.

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"Impacto de las variables psicológicas en modelos económicos de consumo." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/casas_c_sd/.

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"Participación y Oferta Laboral de las Mujeres Casadas del Estado del Estado de Tlaxcala." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/ramos_z_s/.

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"Análisis del Bienestar Subjetivo: Aplicación para la Pobreza en México." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/trujillo_f_f/.

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"Adopción y difusión tecnológica en Puebla: Las computadoras personales." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/delgado_a_r/.

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"Análisis del surgimiento y desarrollo del crédito en México, del siglo XVI hasta principios del siglo XX. Perspectiva de la economía de la información." Tesis, Universidad de las Américas Puebla, 2003. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/pulido_g_g/.

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"Medición del diferencial salarial sindical con corrección por endeogeneidad para el caso de México." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/quitl_a_cg/.

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"Geografía Económica y Economías de Aglomeración: Analísis para la industria manufacturera en México para 1998." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/aznar_b_mi/.

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"Determinantes de la pobreza en México: 1992-2002." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/gomez_s_ai/.

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"El Impacto de la Tarifa Eléctrica Subsidiada sobre la Adopción de Tecnología de Riego." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/fernandez_r_r/.

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"Análisis de la dinámica de la pobreza de los hogares en México para el periodo 2001-2002." Tesis, Universidad de las Américas Puebla, 2005. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/leon_b_e/.

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"Un análisis de desarrollo infantil en el área de Cholula con información limitada." Tesis, Universidad de las Américas Puebla, 2004. http://catarina.udlap.mx/u_dl_a/tales/documentos/lec/haddad_g_ja/.

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