Dissertations / Theses on the topic 'Alas'
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Walker, James Cody. "O ho alas alas : poetry and difficult laughter /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/9354.
Full textGilbert, Timothy George. "Electronic states of ultrathin GaAs/AlAs superlattices." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/35893.
Full textFoerster, Walter Bernhard von. "Optisch detektierte magnetische Resonanzen an GaAs/AlAs-Heterostrukturen." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959473521.
Full textSenozan, Selma. "First-principles Study Of Gaas/alas Nanowire Heterostructures." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614634/index.pdf.
Full textMamun, Ahmed Zakir. "Far infrared study of asymmetric GaAs/AlAs superlattices." Thesis, University of Essex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387411.
Full textRegis, Mcglennon da Rocha. "Estudo da oxidação de AlAs em heteroestruturas semicondutoras." Universidade Federal de Minas Gerais, 2002. http://hdl.handle.net/1843/ESCZ-5KUPHR.
Full textNo presente trabalho, estudamos o processamento por oxidação de AlAs em heteroestruturas semicondutoras. Nossos resultados mostram uma dependência direta do comprimento de oxidação com o tempo de exposição à atmosfera oxidante. Isso acarreta uma mudança na refletividade das heteroestruturas com um deslocamento da faixa de refletividade máxima para comprimentos de onda menores. Determinamos o perfil químico das estruturas e mostramos a perda de As nas regiões oxidadas. Nossos resultados mostram um desnível na fronteira entre as regiões oxidadas e nãooxidadas. Concluímos que o processo de oxidação ocorre significativamente nas camadas de AlAs, não sendo percebido o mesmo para as camadas de GaAs.
Lamberti, Fabrice-Roland. "Opto-phononic confinement in GaAs/AlAs-based resonators." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC103/document.
Full textThe work carried out in this thesis addresses the conception and the experimental characterization of opto-phononic resonators. These structures enable the confinement of optical modes and mechanical vibrations at very high frequencies (from few tens up to few hundreds of GHz). This study has been carried out on multilayered nanometric systems, fabricated from III-V semiconductor materials. These nanophononic platforms have been characterized through high resolution Raman scattering measurements. The experimental methods and the numerical tools that we have developed in this thesis have allowed us to explore novel confinement strategies for acoustic phonons in acoustic superlattices, with resonance frequencies around 350 GHz. In particular, we have studied the acoustic properties of two nanophononic resonators. The first acoustic cavity proposed in this manuscript enables the confinement of mechanical vibrations by adiabatically changing the acoustic band-diagram of a one-dimensional phononic crystal. In the second system, we take advantage of the topological invariants characterizing one dimensional periodic structures, in order to create an interface state between two phononic distributed Bragg reflectors. We have then focused on the study of opto-phononic cavities allowing the simultaneous confinement of light and of high frequency mechanical vibrations. We have measured, by Raman scattering spectroscopy, the acoustic properties of planar nanophononic structures embedded in three-dimensional micropillar optical resonators. Finally, in the last sections of this manuscript, we investigate the optomechanical properties of GaAs/AlAs micropillar cavities. We have performed numerical simulations through the finite element method that allowed us to explain the three-dimensional confinement mechanisms of optical and mechanical modes in these systems, and to calculate the main optomechanical parameters. This work shows that GaAs/AlAs micropillars present very interesting properties for future optomechanical experiments, such as very high mechanical resonance frequencies, large optical and mechanical quality factors at room temperature, and high values for the vacuum optomechanical coupling factors and for the Q • f products
Godon-Martinez, Nuria. "Espacios masoquistas en "La Regenta" de Leopoldo Alas, Clarin." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3239443.
Full textIwabuchi, Akifumi. "The social organization of the Alas of Northern Sumatra." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305759.
Full textMACHKOV, IGOR. "Structure fine des excitons dans les superreseaux gaas/alas." Paris 7, 1996. http://www.theses.fr/1996PA077094.
Full textValderrama, Maguiña Igor. "Miguel Giusti. Alas y raíces: Ensayos sobre ética y modernidad." Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index/handle/123456789/119234.
Full textLerner, Febres Salomón. "Miguel Giusti: Alas y raíces. Ensayos sobre ética y modernidad." Pontificia Universidad Católica del Perú - Departamento de Humanidades, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/113017.
Full textHe, Hongtao. "Vertical transport properties of weakly-coupled Ac-driven GaAs/AlAs superlattices /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202006%20HE.
Full textSaci, Abdelhak. "Transport thermique dans les milieux nano-structurés (GaAs)n / (AlAs)n." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00825305.
Full textGradl, Christian [Verfasser], and Christian [Akademischer Betreuer] Schüller. "Anisotrope Lochspindynamik in GaAs/AlAs-Quantentrogstrukturen / Christian Gradl ; Betreuer: Christian Schüller." Regensburg : Universitätsbibliothek Regensburg, 2018. http://d-nb.info/1151700096/34.
Full textPasquali, Valerio. "Fabrication and measurement of strain-free GaAs/AlAs quantum dot devices." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066631.
Full textIn this thesis the formation of quantum dots (QD) via in-situ droplet nanohole etching, the fabrication and characterization of devices based on these nanostructures is described. The thesis consists of seven chapters. In the first chapter an introduction is given to present the topic to the reader. In the second chapter the experimental methods are presented. In the third chapter, the fabrication method is described and the experimental results obtained in this project are discussed. It will be shown the use of in-situ droplet etching to locally modify the thickness of a modulation doped quantum well, to create QDs embedded in a quantum well(QW) where a two dimensional electorn gas (2DEG) is confined by modulation doping and the embedding of these nanostructures in a n-i-Schottky diode. The effect of these strain-free dots, and the related nanoscale thickness fluctuations of the quantum well, on the 2DEG mobility are discussed in the fourth and in particular in the fifth chapter. In the sixth chapter, the fabrication of a lateral p-n junction based on the QW sample with embedded QD is presented. Following describing the fabrication stages and analysing the influence of each stage on the device, the optical properties of the junction will be discussed. In particular, it will be shown the electroluminescence of a single dot located at lateral the p-n junction. Finally, in the last chapter the conclusion of this work and the future projects are presented
Abdullah, Mohd. "GaAs/AlAs ASPAT diodes for millimetre and sub-millimetre wave applications." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/gaasalas-aspat-diodes-for-millimetre-and-submillimetre-wave-applications(89581b9e-edc9-4eb6-9392-e466a0f8de81).html.
Full textSellitto, Philippe. "Etude du centre DX dans les superréseaux GaAs/AlAs dopés silicium." Montpellier 2, 1994. http://www.theses.fr/1994MON20044.
Full textChastaingt, Bruno. "Spectroscopie d'hétérostructures ultra-minces appliquée à l'étude de l'interface GaAa/AlAs." Nice, 1993. http://www.theses.fr/1993NICE4694.
Full textTEISSIER, ROLAND. "Effets electro-optiques dans les heterostructures gaas/alas de type ii." Paris 6, 1992. http://www.theses.fr/1992PA066340.
Full textLee, Hae-Yeong. "Microcapteur piézorésistif à base d'alliage AlGaAs et de superréseaux GaAs/AlAs." Ecully, Ecole centrale de Lyon, 2001. http://www.theses.fr/2001ECDL0010.
Full textSulmont, Denis. "La sociología de Alain Touraine y las dos alas de la modernidad." Pontificia Universidad Católica del Perú, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/115009.
Full textBoujdaria, Kaïs. "Effets des fortes excitations dans les superreseaux gaas/alas de type ii." Paris 7, 1993. http://www.theses.fr/1993PA077023.
Full textBremme, Laura Emmanuelle. "Dispersion and mixing of bands with X-symmetry in GaAs/AlAs systems." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394015.
Full textWoodward, Ted K. McGill T. C. McGill T. C. "Experimental studies of heterostructure devices : resonant tunneling transistors and GaAs/AlAs capacitators /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-02022007-093432.
Full textKrieger, Matthias. "Near infrared Brillouin scattering in epitaxial AlxGa₁-xAs layers and AlAs-GaAs-superlattices /." Lausanne, 1994. http://library.epfl.ch/theses/?nr=1238.
Full textDenk, Petra. "Growth and Electronic Properties of AlAs/GaAs Lateral Superlattices: from 2D to 1D." Diss., lmu, 2000. http://nbn-resolving.de/urn:nbn:de:bvb:19-2788.
Full textAwan, Iram Taj. "Optical and transport properties of p-i-n GaAs/AlAs resonant tunneling diode." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4981.
Full textUniversidade Federal de Minas Gerais
In this thesis, we have investigated the optical and transport properties of a p-i-n GaAs-AlAs resonant tunneling diode (RTD). The possibility of controlling and significantly varying the density of carriers accumulated at different layers of this structure simply by applying an external bias makes it very useful to investigate various fundamental issues. Furthermore, the process of tunneling that critically depends on the alignment from confined energy levels and the injection of carriers that attain quasi - equilibrium distribution at distinct accumulation layers makes this structure very special for analyzing optical properties in general, and in special, spin-polarization effects when an external magnetic field is applied to the RTD. Particularly, two emission bands were observed for the quantum well (QW) of our structure and were associated to the recombination of electrons and holes that tunnel into the QW and may recombine either as an exciton involving the fundamental states of the QW or a transition involving an acceptor state in the QW. It was also observed that the relative intensity of these emission bands strongly depend on the applied bias voltage. The optical recombination involving acceptors states becomes relatively more efficient as compared to the excitonic recombination for higher densities of electrons in the QW. This effect was discussed considering how the electron carrier density depends on the applied voltage and other effects such the capture rate of holes by the acceptors and electron and hole differences concerning mobility, effective mass and tunneling processes. We have also investigated spin properties of the tunneling carriers in our device by measuring the polarization-resolved electroluminescence from the quantum well (QW) and the contact layers under low temperatures and high magnetic fields, up to 15 T. Under these conditions, we have observed that the QW emission presents a large negative polarization degree which depends on the external applied bias voltage. The VII QW spin polarization shows oscillations and abrupt changes at the electron resonant peak. The results are mainly attributed to the abrupt changes of intensity of the two QW emission lines. Furthermore, the contact-layer emission have also shown voltage dependent emission lines that were attributed to the two-dimensional electron gas formed at the accumulation layer under an applied bias. The contact-layer emission presents a large negative polarization degree which is also voltage dependent. The QW spin polarization degree was discussed considering different effects such as the presence of neutral acceptors in the QW, the voltage control of carrier densities in the device, hole and electron tunneling processes and the spin injection of spin polarized two-dimensional gases formed at the accumulation layers.
Neste trabalho, estudamos as propriedades óticas e de transporte de diodos de tunelamento ressonante de GaAs-AlAs do tipo p-i-n. Observamos duas emissões no poço quântico (QW) que foram associadas a recombinação e eletrons e buracos que tunelam no QW e que podem recombinar com os níveis confinados no QW ou com o nível de impureza aceitadora no QW. Foi observado que a intensidade relativa dessas bandas é bastante sensível a voltage aplicada. Em particular, a emissão ótica relativa a impureza mostrou ser mais eficiente na condição de voltagem que resulta em alta densidade de portadores no QW. Estudamos também efeitos de spin nesses dispositivos na presença de altos campos magnéticos de até 15T. Observamos que polarização de spin de portadores é controlada por voltagem aplicada. Em particular, observamos que a polarização de spin apresenta fortes oscilações e variações abruptas dependendo da voltagem aplicada no dispositivo . Esse efeito foi associado a mudanças importantes de densidade de carga acumulada no QW em função da voltage aplicada. Foi também observado uma emissão fortemente dependente da voltagem na região dos contatos que foi associada a formação de uma gas bidimensional de eletrons (2DEG) com alto grau de polarização circular. A polarização de spin no QW foi associada a presença de impurezas , efeitos de injeção de portadores spin polarizados no QW, variação de densidade de portadores no QW, processos de tunelamento de eletrons e buracos e etc.
Ghofar, Abdul. "Population biology and fishery of squid and cuttlefish in the Alas Strait, Indonesia." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330106.
Full textTanaka, Martín. "Breves impresiones sobre el XX Congreso de la Asociación Latinoamericana de Sociología (ALAS)." Pontificia Universidad Católica del Perú, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/115113.
Full textTurc, Sylvie. "La famille et les relations familiales dans l'oeuvre narrative de Leopoldo Alas, "Clarín"." Paris 4, 1993. http://www.theses.fr/1993PA040049.
Full textThe research on the family and the familial relationship in the narrative work of Leopoldo Alas,'Clarin',is turned towards a presentation of the different types of families and their factors of development. .
Benhlal, Jamal-Tahir. "Transport perpendiculaire et propagation guidee dans les superreseaux gaas-alas de courte peride." Paris 7, 1989. http://www.theses.fr/1989PA077010.
Full textKUHN, OLIVIER. "Electroluminescence et transport bipolaire dans des heterostructures gaas/alas a effet tunnel resonnant." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10179.
Full textHelmholz, Dirk. "Enhanced and stimulated photoluminescence of type-II GaAs/AlAs superlattices : theory and experiment /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202002%20HELMHO.
Full textIncludes bibliographical references (leaves 91-97). Also available in electronic version. Access restricted to campus users.
Kleckner, Todd Christopher. "Quasi-phase-matched nonlinear frequency conversion in periodically disordered GaAs/AlAs superlattice-core waveguides." Thesis, University of Glasgow, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249977.
Full textBosc, Fabien. "Centre DX et mobilité électronique dans les superréseaux GaAs/AlAs-application capteur de pression." Montpellier 2, 1997. http://www.theses.fr/1997MON20169.
Full textDanan, Gilles. "Proprietes optiques et structure de bande des super-reseaux de courte periode gaas-alas." Paris 6, 1988. http://www.theses.fr/1988PA066179.
Full textMd, Zawawi Mohamad Adzhar bin. "Advanced In0.8Ga0.2As/AlAs resonant tunneling diodes for applications in integrated mm-waves MMIC oscillators." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/advanced-in08ga02asalas-resonant-tunneling-diodes-forapplications-in-integrated-mmwaves-mmic-oscillators(4fe1e777-f2ba-43c1-b37c-6a446abf2701).html.
Full textDanan, Gilles. "Propriétés optiques et structure de bande des super-réseaux GaAs-AlAs de courte période." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612877v.
Full textLöfling, Emil. "”But alas – where are any Lovecraft pieces?” : En narratologisk undersökning av H.P. Lovecrafts noveller." Thesis, Uppsala universitet, Litteraturvetenskapliga institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-219145.
Full textSemtsiv, Mykhaylo. "InGaAs-AlAs and InGaAs-InGaP strain-compensated heterostructures for short wavelength intersubband transitions and lasers." Doctoral thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972710450.
Full textPietka, Barbara. "Complexes Excitoniques dans des Boîtes Quantiques Naturelles dans des Structures GaAs/AlAs de type II." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00179386.
Full textCe travail est consacré à l'étude des complexes excitoniques fortement confinés, à leur nature et aux processus permettant leur formation.
Nous présentons des études spectroscopiques de l'émission d'une boîte quantique unique sous différentes conditions d'excitation et détectée de différentes manières.
La possibilité de contrôler optiquement le nombre d'électrons et de trous qui occupent les niveaux discrets des boîtes quantiques nous a permis d'étudier la formation de complexes multi-excitoniques en fonction de la densités d'excitons. Les effets observés sont décrits par le modèle de la normalisation des bandes d'énergie comprenant les effets multi-corps, les interactions d'échange et les effets de corrélation.
L'influence d'un champ magnétique sur les complexes multi-excitoniques est d'abord discutée. De manière générale, il est montré comment l'application d'un champ magnétique modifie la structure énergétique des transitions observées. Des propriétés typiques de boîtes quantiques telles que l'effet Zeeman, décalage diamagnétique et l'énergie de liaison excitonique sont discutées. Ces études ont permis une analyse de la symétrie et de la taille du potentiel de confinement des boîtes.
Ensuite, les mécanismes de capture d'excitons dans les boîtes sont considérés. Le rôle important des processus de diffusion contribuant au temps de relaxation de l'émission des boîtes quantiques uniques est discuté sur la base d'expériences de spectroscopie résolue en temps.
Le rôle des processus radiatifs et non radiatifs dans l'émission de complexes multi-excitoniques est montré dans l'émission thermiquement activée de boîtes quantiques uniques.
Les mesures de corrélation de photon ont permis la classification des différentes lignes d'émission des complexes multi-excitoniques, d'étude du caractère de mécanisme de capture des porteurs photo-créés et la dynamique des fluctuations de charge caractéristiques d'une boîte quantique unique.
L'approche expérimentale à un problème de boîte quantique unique est largement discutée et des modèles théoriques sont appliqués pour décrire les effets observés.
Shaik, Khaleelulla Saheb [Verfasser], and Gerd [Akademischer Betreuer] Jürgens. "Role of Wol and Alas in Drosophila skin differentiation / Khaleelulla Saheb Shaik ; Betreuer: Gerd Jürgens." Tübingen : Universitätsbibliothek Tübingen, 2012. http://d-nb.info/1162842881/34.
Full textDixon, Simon W. C. "Molecular cloning and characterisation of the delta-aminolaevulinate synthase gene (delta-ALAS) in Aspergillus nidulans." Thesis, University of Leicester, 1994. http://hdl.handle.net/2381/34404.
Full textGougam, Adel Badreddine. "Etude de la magnétorésistance négative et de la localisation faible dans les superréseaux GaAs-AlAs." Montpellier 2, 1997. http://www.theses.fr/1997MON20176.
Full textIwabuchi, Akifumi. "The people of the Alas valley : a study of an ethnic group of Northern Sumatra /." Oxford : Clarendon press, 1994. http://catalogue.bnf.fr/ark:/12148/cb35735758b.
Full textBen, Gsim Abdessafar. "Contribution à l'étude hydrogéologique du bassin versant de l'Oued Ras El Ma (Alas tunisien central)." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602819g.
Full textFillière, Carole. "Le lien et la rupture. Écriture de l’ironie et de l’intime dans l’œuvre de Leopoldo Alas Clarín (1852-1901)." Thesis, Paris 3, 2009. http://www.theses.fr/2009PA030054.
Full textThis dissertation aspires to renew the critical interpretation of Leopoldo Alas Clarín’s work through a stylistic analysis of all his prose writings, disregarding hierarchic matters. This new reading is based on the author’s cultural references and the internal echoes in his works in order to describe his intellectual vitality. Clarín’s style arises from the dynamic combination of aesthetics of irony and a creative work on intimacy, that materializes the contrast between connection and rupture, both key elements of his works. This study combines the fields of irony and artistic empathy, usually considered linked to two different positions –distance and proximity–, bringing them together in a single approach using the idea of textual intimacy. It aims at understanding the particularities of a complex realism that has the imprint of a strong creative subjectivity and is eager to express a contrasted human truth. The first part make! s a conceptual displacement in the figure of irony, from a rhetorical device subordinate to satire, to a mode of representation. Irony creates a system of voices and textual relations that integrates quotations, demonstrating the demiurgic power of the author who challenges the reader from within the language. The second part is focused on the way Clarín’s writing represents the inner self and his failures, as a broken being and a broken voice. The intimate secret, despite the limitations of language, reveals the existence of hope and discloses a view of the transcendence of the aesthetic, ethic and religious connection. The Clarín’s works are characterized by their ambiguity: the textual complexity arises from the contrast between power and helplessness, between the spectacular and the secret
Laura, Rivadeneira José Luis. "Evaluacion genotoxica del tomate (lycopersicum esculentum) expuesto a plaguicidas mediante el test en alas de drosophila." Universidad Mayor de San Andrés. Programa Cybertesis BOLIVIA, 2008.
Laura, Rivadeneira José Luis. "Eevaluación genotóxica del tomate (lycopersicum esculentum) expuesto a plaguicidas mediante el test en alas de drosophila." Universidad Mayor de San Andrés. Programa Cybertesis BOLIVIA, 2008.