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Smith, Philip D. « Passionists, evangelizing the Third Millennium, by lives worthy of imitation ». Theological Research Exchange Network (TREN), 1995. http://www.tren.com.
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Sharpe, Rosemary Ann. « Franciscan values and social contexts : a sociological study of founders of Anglican Franciscan Third Orders, 1882-1939 ». Thesis, London School of Economics and Political Science (University of London), 1993. http://etheses.lse.ac.uk/1227/.
Texte intégralRésumé :
This thesis is an account of how certain resources and the values they expressed came to be available and visible in society, and of how these values were taken up, transformed and used in particular ways. It will demonstrate how four individuals, in different social contexts, acquired and transformed these values, as they attempted to initiate varying forms of the same type of organisation. The values with which the thesis is concerned are those inferred from the life of St. Francis of Assisi (1182-1226). Part One sketches how (a) Roman Catholics made the values they ascribed to St. Francis available as resources and (b) those outside the Roman Catholic Church, especially in the period 1882-1939, came to know of these resources and values, and modified them. Part Two consists of four life-history narratives constructed from oral history, manuscripts and printed materials. They recount how four people in this period came to be stimulated by these resources, and attempted to institutionalise the values they absorbed from them in different forms of an Anglican Franciscan Third Order. The first narrative traces part of the mercurial life of James Adderley, who encouraged individuals to express Franciscan values through attempting to bring about social justice. The second narrative explains how Emily Marshall came to connect Franciscan values with her desire to see women's ministry recognised by the Church of England. The third and fourth narratives are set mainly in India. John Winslow in the 'High Noon' of the British Empire linked Franciscan and Indian bhakti values to form an ashram, Christa Seva Sangha. Verrier Elwin merged Franciscan and Gandhian values while living among aboriginal tribes. The final chapter analyses the complex interplay between Franciscan values and social contexts which is demonstrated by these four examples, and draws some sociological conclusions from the research.
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Silva, Caroline Cristina Souza. « A prudência no trato das almas : relações de poder, fiscalidade e ação pastoral no bispado de Mariana (1777-1793) ». Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/8/8138/tde-06122018-101922/.
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Este estudo busca compreender as ações de D. Frei Domingos da Encarnação à frente do bispado de Mariana e as suas relações com o corpo de eclesiásticos, a população da capitania de Minas Gerais e os poderes locais e do reino. Com o objetivo de entender as relações existentes entre o Estado e Igreja portugueses em finais do século XVIII, essa pesquisa toma como ponto de partida os debates e aplicações do projeto pombalino. Para isso, são analisadas as noções de regalismo e episcopalismo e como elas estiveram presentes nas ações episcopais no bispado de Mariana. Essas ações tiveram influência direta na administração do bispado, na reforma pastoral e dos sacramentos e, sobretudo, na relação do quarto bispo de Mariana com as irmandades e ordens terceiras da capitania de Minas Gerais. A taxação das conhecenças (um tipo de dízimo eclesiástico) foi o pivô dessas interações sociais e relações de poder. Dela transpareceram os problemas de jurisdição em torno das Constituições Primeiras do Arcebispado da Bahia (1707); os problemas de estrutura e sustentação do bispado de Mariana; as contendas entre párocos e a população mineira; os debates em torno dos limites dos poderes do rei, do papa e do bispo; as contendas sobre a afirmação da hierarquia eclesiástica tridentina em contraposição às irmandades e ordens terceiras. Em todo esse estudo, o conceito de interpenetração é fundamental na análise das relações entre as funções civis e eclesiásticas no Antigo Regime português.This study seeks to understand the actions of D. Frei Domingos da Encarnação Pontevel at the bishopric of Mariana and his relations with the ecclesiastical body, the people of the Capitania de Minas Gerais and both the local and metropolitan powers. Aiming to comprehend the existent relations between the Portuguese State and Chuch in the end of the 18th century, this research takes as starting point the debates and applications of Pombals Project. Thereunto, the notions of Episcopalism and Regalism and how they were presented at the episcopal actions in the bishopric of Mariana are the main points analysed in this study. These actions had direct influence at the bishoprics administration, the pastoral and sacramental reforms and, especially, the relations of the fourth Bishop of Mariana with the religious brotherhoods and third orders of the Capitania de Minas Gerais. The conhecenças taxation (a type of ecclesiastical tithe) were the center of these social interactions and power relations. They showed up the jurisdiction problem around the First Constituitions of the Archbishopric of Bahia (1707); the problems of structure and support of the bishopric of Mariana; the contentions between the priests and the people of Minas; the pleading around the power limits of the king, the pope and the bishop; the strifes about the affirmation of the Tridentine ecclesiastical hierarchy in contrast to the religious brotherhoods and third orders. In this entire study, the concept of interpenetration is fundamental for understanding the relations between the civil and ecclesiastical functions in Portuguese Absolutism.
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Granata, Massimo. « Optical development for second and third generation gravitational wave detectors : Stable recycling cavities for Advanced Virgo and Higher-orders Laguerre-Gauss Modes ». Paris 7, 2011. http://www.theses.fr/2011PA077208.
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Les ondes gravitationnelles sont des perturbations de l'espace-temps qui pourraient être détectées par un interféromètre de Michelson avec cavités Fabry-Perot. Plusieurs interféromètres sont à présent en opération: LIGO, Virgo, GEO. Ces instruments ont atteint leur sensibilité nominale et ont accompli plusieurs acquisitions de données scientifiques. Aucune détection n'a été reportée. Advanced Virgo, Advanced LIGO et LCGT sont les projets d'amélioration de sensibilité des détecteurs actuels d'un ordre de grandeur. Ces instruments, dont la construction est en cours, permettront la première détection directe des ondes gravitationnelles. Une ultérieure troisième génération d'instrument offrant une encore plus grande sensibilité est à l'étude. La sensibilité des détecteurs futurs sera limitée par le bruit thermique des miroirs. Cette thèse porte sur deux thèmes liés à la réduction de ce bruit. Le premier concerne la conception optique des cavités stable de Advanced Virgo. Leurs propriétés sont présentées, les arguments en faveur de leur utilisation sont discutés. Une procédure est établie pour achever leur conception optique. Plusieurs configurations sont examinées, conduisant à la sélection de l'une d'entre elles dont on discute les performances optiques. Le deuxième thème concerne l'utilisation des modes de Laguerre-Gauss (LG). On présente les résultats d'une expérience testant la génération d'un mode LG33 avec une optique diffractive et une cavité Fabry-Perot. Ce mode est utilisé dans un interféromètre de Michelson pour démontrer la faisabilité de mesures interférométriques avec des faisceaux non-Gaussiens. L'utilisation des modes LG dans les détecteurs futurs est discutéeGravitational waves are ripples in the fabric of space-time which might be detected with a Fabry-Perot Michelson interferometer. Several interferometers are presently operating: LIGO, Virgo, GEO. These instruments almost reached the design sensitivity and completed several observational runs. No detection is reported, but the data have been used to constraint the emission of astrophysical sources in the nearby Universe. Advanced Virgo, Advanced LIGO and LCGT are projects to increase the sensitivity of initial detectors by an order of magnitude, allowing the first direct detection. Their construction is presently ongoing. In the meanwhile, the project of a detector (Einstein Telescope) of higher sensitivity is under study. The sensitivity of future detectors will be limited by mirror thermal noise. In this thesis, two topics related to the reduction of this noise are presented. The first topic is the optical design of stable recycling cavities for Advanced Virgo. Their main features are presented, and the motivations for their implementation are discussed. A process for their optical design is established, and several layouts are drawn. A final configuration is retained, and its optical performances are discussed. The second topic concerns the use of higher-order Laguerre-Gauss laser modes. After a brief introduction about these modes, the results of a table-top experiment to test the generation of an LG33 mode with a diffractive plate and a Fabry-Perot cavity are presented. The mode is used in a Michelson interferometer, to demonstrate the ability of interferometric measurements with non-Gaussian beams. The implementation of these modes in future detectors is discussed
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Precioso, Daniel. « Terceiros de cor : pardos e crioulos em ordens terceiras e arquiconfrarias (Minas Gerais, 1760-1808) ». reponame:Repositório Institucional da UFF, 2014. https://appdesenv.uff.br/riuff/handle/1/312.
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Precioso, Daniel-Tese-2014.pdf: 2609576 bytes, checksum: e7ee5a477b36b702e64f49b9916e3bf7 (MD5)Made available in DSpace on 2014-07-01T17:56:00Z (GMT). No. of bitstreams: 1 Precioso, Daniel-Tese-2014.pdf: 2609576 bytes, checksum: e7ee5a477b36b702e64f49b9916e3bf7 (MD5) Previous issue date: 2014
Esta tese apresenta um estudo de arquiconfrarias e ordens terceiras fundadas por pardos e crioulos, forros ou livres, na Capitania de Minas Gerais – sobretudo, em Vila Rica e Mariana – durante a segunda metade do século XVIII. A pesquisa concilia o exame da dinâmica institucional dessas corporações com uma análise das carreiras e redes sociais tecidas pelos seus membros. Destaca-se que o estabelecimento das associações estudadas não reflete apenas o desejo de aprimoramento da vida religiosa e a devoção de seus fundadores, mas também a tentativa de aquisição de privilégios religiosos, isenções jurisdicionais e status social. Além disso, relaciona-se o surgimento das instituições analisadas com a promoção de ações de caridade e assistência social.
This thesis is a study of Archonfraternities and Third orders created by pardos and creoles, freed or free men, in the Captaincy of Minas Gerais – most importantly, in Vila Rica and Mariana – during the second half of the XVIII century. The research reconciles the exam of the institutional dynamics of those corporations with an analysis of the careers and social networks woven by their members. This study emphasizes that establishment of the studied associations doesn’t reflect only the desire to perfect the religious life and the devotion of their founders, but also the attempt to acquire religious privileges, exemptions of authorities and social recognition. Furthermore, this study links the appearance of the institutions analyzed with the promotion of charity actions and social assistance.
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Hu, Honghua. « Third Order Nonlinearity of Organic Molecules ». Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5310.
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The main goal of this dissertation is to investigate the third-order nonlinearity of organic molecules. This topic contains two aspects: two-photon absorption (2PA) and nonlinear refraction (NLR), which are associated with the imaginary and real part of the third-order nonlinearity (x3) of the material, respectively. With the optical properties tailored through meticulous molecular structure engineering, organic molecules are promising candidates to exhibit large third-order nonlinearities. Both linear (absorption, fluorescence, fluorescence excitation anisotropy) and nonlinear (Z-scan, two-photon fluorescence, pump-probe) techniques are described and utilized to fully characterize the spectroscopic properties of organic molecules in solution or solid-state form. These properties are then analyzed by quantum chemical calculations or other specific quantum mechanical model to understand the origins of the nonlinearities as well as the correlations with their unique molecular structural features. These calculations are performed by collaborators. The 2PA study of organic materials is focused on the structure-2PA property relationships of four groups of dyes with specific molecular design approaches as the following: (1) Acceptor-[pi]-Acceptor dyes for large 2PA cross section, (2) Donor-[pi]-Acceptor dyes for strong solvatochromic effects upon the 2PA spectra, (3) Near-infrared polymethine dyes for a symmetry breaking effect, (4) Sulfur-squaraines vs. oxygen-squaraines to study the role of sulfur atom replacement upon their 2PA spectra. Additionally, the 2PA spectrum of a solid-state single crystal made from a Donor-[pi]-Acceptor dye is measured, and the anisotropic nonlinearity is studied with respect to different incident polarizations. These studies further advance our understanding towards an ultimate goal to a predictive capability for the 2PA properties of organic molecules. The NLR study on molecules is focused on the temporal and spectral dispersion of the nonlinear refraction index, n2, of the molecules. Complicated physical mechanisms, originating from either electronic transitions or nuclei movement, are introduced in general. By adopting a prism compressor / stretcher to control the pulsewidth, an evolution of n2 with respect to incident pulsewidth is measured on a simple inorganic molecule –carbon disulfide (CS2) in neat liquid at 700 nm and 1064 nm to demonstrate the pulsewidth dependent nonlinear refraction. The n2 spectra of CS2 and certain organic molecules are measured by femtosecond pulses, which are then analyzed by a 3-level model, a simplified “Sum-over-states” quantum mechanical model. These studies can serve as a precursor for future NLR investigations.ID: 031001375; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Adviser: Eric W. Van Stryland.; Co-adviser: David J. Hagan.; Title from PDF title page (viewed May 21, 2013).; Thesis (Ph.D.)--University of Central Florida, 2012.; Includes bibliographical references (p. 213-226).
Ph.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
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Borne, Adrien. « Triple photons through third-order nonlinear optics ». Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY071/document.
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Ce travail porte sur la génération directe de triplets de photons par interaction optique non linéaire du troisième ordre avec la matière solide. Les trois photons constituant l'état triplet proviennent de la scission d'un unique photon, et sont donc étroitement corrélées. Des champs supplémentaires peuvent stimuler le processus, et ainsi augmenter son efficacité de conversion, mais au détriment de la conservation des corrélations de l'état triplet. Deux stratégies sont adoptées pour générer efficacement ces triplets tout en conservant leurs propriétés de cohérence. La première porte sur génération de triplets dans des oxydes massifs cristallins, rendue possible à travers la réalisation d'accords de phase par biréfringence. Ces cristaux peuvent être placés en cavité de manière à augmenter artificiellement la longueur d'interaction. Dans ce contexte, KTP et TiO2 sous sa forme rutile sont étudiés expérimentalement; la configuration en cavité fait l'objet d'une étude théorique. La seconde stratégie se concentre sur la génération de triplets dans des fibres optiques, à travers un accord de phase modal. Leurs longueurs, le confinement du champ électromagnétique, ainsi que la non-existence de processus quadratiques pouvant polluer la génération de triplets sont des avantages importants. Des expériences de génération de troisième harmonique dans des fibres de silice dopées germanium sont réalisées ; et les propriétés d'accord de phase dans des fibres à cristaux photoniques en chalcogénures sont calculéesThis work concentrates on the direct generation of triple photons through third-order nonlinear optical interactions with solid-state matter. The three photons constituting the triplet state arise from the splitting of a single photon, and are therefore highly correlated.The four interacting particles fulfill the energy and linear momentum conservation laws. Additional fields can stimulate this process and thus increase its conversion efficiency, but at the cost of losing the correlations of the triplet states. In order to generate efficiently the triplets while preserving their coherence properties, two strategies are investigated. In the first one, the interaction occurs in oxide bulk crystals, thanks to a birefringent phase matching. These crystals can be put into a cavity so as to artificially increase the interaction length. In this context, KTP and rutile TiO2 are studied experimentally; the cavity configuration is subjected to a theoretical work. The second strategy focuses on the generation in optical fibers, through a modal phase matching. Their length, the confinement of the electromagnetic field, and the non-existence of polluting second-order nonlinear processes are key advantages. Third-harmonic generation experiments on germanium-doped silica fibers are performed; and phase-matching properties in chalcogenide photonic-crystal fibers are calculated
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Andrews, James Herbert. « Third-order optical nonlinearities in organic chromophores ». Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1062765754.
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Derbazi, Maqboula. « Étude des caractéristiques Raman et optique non-linéaire des bronzes de tungstène quadratiques (A6M2M’8O30) ». Thesis, Reims, 2013. http://www.theses.fr/2013REIMS041.
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Des recherches très importantes ont été dédiées à l'étude des composés ferroélectriques de type bronze de tungstène quadratique (TTB). Cette thèse concerne la synthèse et la caractérisation de 7 matériaux TTB de formule générale A6M2M'8O30 (A = Sr2+, Ba2+ ou Pb2+, M = Ti4+, Zr4+ ou HF4+; M' = Nb5+ ou Ta5+). Ces composés cristallins de grande taille ∼100 nm ont été synthétisés sous forme de poudre. Les moyennes expérimentales : diffractions des rayons X, spectroscopie Raman, la microscopie électronique MEB et MET, l'optique non linéaire ONL, ont permis d'établir des relations étroites entre structure et propriétés physiques. Les susceptibilités optiques non linéaires de 2eme et 3eme ordres, χ(2), χ(3) de chaque composés ont été déterminées et les valeurs résultantes du χ(3) ne montrent pas les mêmes caractéristiques que χ(2), car le signal de THG est moins dépendant de structure que SHG qui requiert un milieu non-centrosymétrique. Le décalage fréquentiel (Δσ) des modes de vibrations entre les structures à base de strontium(Sr) et celles à base de Barium(Ba) a été constaté afin d'identifier les signatures propres de ces composés. L'interprétation de ces poudres n'était pas facile car les pics sont très délicats. Nos mesures expérimentales montrent clairement que les positions des pics peuvent être modifiées par le changement cationique au sein des matériaux, plus la maille cristalline est rigide, plus on a des pics plus discernables. La différence est nettement visible là ou l'émission est autour de 808 cm-1 pour la structure (Sr), alors que pour le (Br) elle est autour de 780cm-1. Nous attribuons ce Δσ (28cm-1) à la transition de groupe de symétrie spatiale de Pba2 vers P4bm. L'ensemble des résultats décrits dans ce travail ont montrés la grande variété des paramètres sur lesquels il est possible d'agir afin d'optimiser les compositions en vue d'une application spécifiqueRecently, very significant research has been devoted to the study of ferroelectric compounds of tetragonal tungsten bronze (TTB). This thesis deals with the synthesis and characterization of 7 TTB's material with general formula A6M2M'8O30 (A = Sr2+, Ba2+ or Pb2+, M = Ti4+, Zr4+ or HF4+, M '= Nb5+ or Ta5+). These crystalline compounds of large size ~ 100 nm were synthesized in powder form. The experimental Technics: X-ray diffraction, Raman spectroscopy, scanning electron microscopy SEM and TEM and nonlinear optics NLO, allowed us to establish close relationships between structure and physical properties. The nonlinear 2nd and 3rd order optical susceptibility χ(2), χ(3) of all compounds were determined and the resulting values of χ(3) did not show the same characteristics as measures of χ(2) because the THG signal is less dependent on the structure where SHG signal requires a non-centro-symmetric medium. The frequency shift between the vibration modes of structures containing strontium (Sr) and those based on Barium (Ba) has been detailed to identify signatures of these specific compounds. The interpretation of these powders wasn't that easy as these peaks are very delicate but our experimental results clearly show that the positions of the peaks can be modified by the change in cation materials, as long as the crystal lattice is more rigid, more we get discernible Raman modes. This difference is clearly visible where the emission is around 808 cm-1 for the structure Sr, whereas the Br it is centered around 780cm-1. We attribute these Δσ (28cm-1) to the transition of spatial symmetry group from Pba2 to P4bm. Results showed the wide variety of settings in which it is possible to act in order to optimize the compositions for a specific application
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Balkan, Serhat. « Time-optimal control of a third order regulator ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA283307.
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Vardareri, Kayhan. « Minimum time control of a third order regulator ». Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28361.
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Approved for public release; distribution is unlimitedThe optimal minimum time control is applied to a third order regulator. From Pontryagin, the optimal control must minimize the Hamiltonian. The control is a function of the states. The state space partitioned into regions where the optimal control is either plus or minus N (the maximum control effort) which is bang-bang control
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Smith, Euan Christopher. « Ultrafast third-order nonlinearities in novel zwitterionic molecules ». Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/599.
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Pääjärvi, Patrik. « Adaptive blind deconvolution using third-order moments : exploiting asymmetry / ». Luleå : Luleå tekniska universitet, 2005. http://epubl.ltu.se/1402-1757/2005/67/.
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Sawyer, James Richard. « The Functionalization of Thermally Stable Third-Order NLO Chromophores ». Wright State University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=wright1033149434.
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Kilbinger, Martin. « Cosmological parameters from second- and third-order cosmic shear statistics ». [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98229204X.
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Chi, San-Hui. « Third-order nonlinear optical properties of conjugated polymers and blends ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31664.
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Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2010.Committee Chair: Perry, Joseph; Committee Member: Bunz, Uwe; Committee Member: Lyon, Andrew; Committee Member: Marder, Seth; Committee Member: Trebino, Rick. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Chan, Seong Phun. « Third order Bragg grating filters in silicon-on-insulator waveguides ». Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/842993/.
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The subject of this thesis is the design, analysis, fabrication and characterisation of third order Bragg grating optical filters on silicon-on-insulator (SOI) rib waveguides. New design guidelines for small cross sectional SOI waveguides have been proposed and described to address the issue of satisfying polarisation independence and single mode conditions simultaneously. This waveguide design will be used as a building block for the realisation of Bragg grating filters. The reflection spectral response of the deep Bragg grating operating in a third diffraction order on a single mode rib SOI waveguide has been studied theoretically using Floquet-Bloch Theory (FBT) developed in Politecnico di Bari, Italy in comparison with optical modelling software utilising Coupled Mode Theory (CMT). A series of Bragg gratings with different grating etch depths and lengths were fabricated at Southampton University to investigate the agreement between experimental results with theoretical predictions. The wavelength tuning capability of these Bragg grating filters in SOI waveguide structures were also investigated and implemented using the thermo-optic effect, through Joule heating of thin film aluminium heaters situated on top of the rib structure. The SOI rib waveguides with 1.5mum height are designed to exhibit polarisation independence and single mode operation. The Bragg grating filter is designed to operate at a wavelength of 1.55mum with a grating period of 689nm. The less rigorous fabrication tolerance of third order grating in comparison with that required by 228nm first order gratings is highly desirable only at the expense of slightly lower maximum reflectivity. The maximum reflectivity measurements of approximately 0.42 for third order grating are in agreement with theoretical prediction by FBT. The Bragg grating filters were thermally tuned to shift the Bragg resonance wavelength by up to 3.5nm with heater power of approximately 190mW. The tuning range of the filter is inhibited by the short lifetime of the heater caused by electromigration. At the time this work was carried out, this is the first demonstration of thermo-optic tuning through an integrated heating element, of third order Bragg grating filters based on small cross sectional SOI waveguide. The temperature sensitivity of the Bragg grating filters was analysed using a 2-D finite element method (FEM) and was consistent with the experimental results.
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Gerges, Hany Zarif Amin. « A skew third order upwinding scheme for modelling settling tanks ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30274.pdf.
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Quinn, Eugene P. « On the boundedness character of third-order rational difference equations / ». View online ; access limited to URI, 2006. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3225327.
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Bi, Bin, et 闭彬. « Third-order tensor decomposition for search in social tagging systems ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45160041.
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Cooper, Colin Roy. « Second and third order minimum time controllers and missile adjoints ». Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28518.
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The month has been spent in a series of harmonic generation experiments at increasing peak intensity and fluence. Second harmonic beam quality has been measured. Using the oscillator alone, with grating selection of the 9.55 micrometer line, the pulse train consisted of a spike containing about 10 pulses followed by a tail containing about 40 pulses. Both the spike and the tail contained approximately equal energy, the combined total going as high as 180 mJ. The crystal was located near to the plane exit mirror of the oscillator, where the near-parallel beam has a Gaussian (amplitude) spot parameter of 0.46 cm. The on-axis fluence was 0.5 J/sq. cm. and the peak intensity in the 2 nsec optical pulses was approximately 20 NW/sq. cm. The pulses were separated by 40 nsec. Energy conversion efficiency of up to 31% was recorded, with 56 mJ of second harmonic (outside the crystal) for 181 mJ of incident 9.55 micrometer radiation. The second harmonic energy depended on the 1.5 power of the fundamental in the fundamental energy range 50 mJ to 180 mJ. Time-dependent analysis showed that the conversion efficiency was close to 50% in the spike but generally less than 10% in the 'tail' as expected from their intensity ratio (in the range 4:1 to 8:1)
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Rangel, Rojo Raul. « Picosecond third-order nonlinearities in organic materials and chalcogenide glasses ». Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1390.
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Lawrence, Brian Lee. « Characterization of second and third order susceptibilities in organic salts ». Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13221.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.Includes bibliographical references (leaves 89-91).
by Brian Lee Lawrence.
M.S.
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Zhu, Xuemei. « A higher-order panel method for third-harmonic diffraction problems ». Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43339.
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Breitenbucher, Jon W. « Third order mock theta functions for multivariable symplectic hypergeometric series / ». The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486394475981188.
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Widerström, Michel. « Entangled photon triplets produced by a third order SPDC process ». Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64640.
Texte intégralRésumé :
This thesis describes the work performed at the Quantum Optics lab at UNAM,Mexico City. Third order spontaneous parametric down conversion (TOSPDC) isa quantum optical process where an incoming photon is annihilated and generatesthree quantum entangled photons, so called photon triplets, under energy and mo-mentum conservation. This TOSPDC process was experimentally realized using afused silica optical fiber as nonlinear source. The spectra of the emitted signal weremeasured and coincidence counts measurements were performed in order to verifythe generation of these triplets. An average of 0.8 triplets per second were detected,which is the first sign of a realized TOSPDC process to our knowledge. At thispoint, the signal was too low for any spectra to be recorded. There is a lot of roomfor improvements, especially regarding the equipment used due to the heavy signalloss throughout the experimental setup, and more experiments will be performed toproperly verify the production and entanglement of the triplet photons.
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Kwan, Wai Ming Hercule. « Parallel implementation of a fast third-order volterra digital filter / ». Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Texte intégral
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Liu, Xing. « Rigorous exponential asymptotics for a nonlinear third order difference equation ». Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1101927781.
Texte intégralRésumé :
Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains viii, 140 p.; also includes graphics. Includes bibliographical references (p. 139-140).
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Quilliam, Neil Mason. « Syria : adjusting to the new world order ». Thesis, Durham University, 1997. http://etheses.dur.ac.uk/5073/.
Texte intégralRésumé :
The advent of the New World Order has challenged Syria's role in the Middle East. Traditionally viewed as a pariah state, and a Soviet satellite, Syria's future looked uncertain. Syria, however, has been able to accommodate the transformation in the world order. The New World Order amounted to a redistribution of global power. The transmutation of Soviet power towards the US culminated in a unipolar world order. The withdrawal of Soviet support through the advent of the New World Order threatened Syria's quest for regional hegemony. Existing in a state of anarchy, the co-ordinates of Syria's foreign policy have been founded upon the principles of self-help, national security, and national interest. These principles have found their expression through Syria's intractable struggle with Israel. Syrian foreign policy has been determined by two factors: primarily, by the international political system, and secondarily, by the influence of domestic politics. Omni balancing provides an explanatory model for foreign policy behaviour that bridges the divide between the determinants of the international political system and the influences of the domestic arena. Following a rational policy, the Syrian state was compelled to realign with the US- led world order, in order to pursue regional hegemony. It was able to display its accommodation of the New World Order by joining the US-led coalition forces in the liberation of Kuwait in 1990/1991. Syria's adjustment to the New World Order was rewarded with a place in the post-war regional order, and a central role in the Madrid Peace Conference.
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Gilkins, Jennifer B. « Question-order effects and the third-person effect distinguishing impact of question-order on the third-person effect in the context of violent video games / ». Access to citation, abstract and download form provided by ProQuest Information and Learning Company ; downloadable PDF file, p, 2008. http://proquest.umi.com/pqdweb?did=1467894211&sid=11&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texte intégral
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Wurz, Elizabeth A. « After My Third Tattoo ». Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/english_diss/19.
Texte intégralRésumé :
This dissertation presents thirty-two poems and an introduction to the collection. In After My Third Tattoo, the poems’ speaker explores methods with which she perceives and constructs reality. Her exploration is the dramatic situation of each poem and the plot of the collection. The poems’ speaker regards physical objects, recalls experiences, and discovers how these objects and experiences hold psychological significance for her. With the intellectual and emotional associations she makes among objects and experiences, the speaker constructs, repeats and varies image patterns. Through her associations, she perceives overlaps in: the rational and emotional, the earthly and divine, the order imposed on her by society and the order that she builds through her own agency, and her perception and the perceptions of others. Finding agency through meditation and language liberates the speaker from identity-making terms that the lesbian speaker rejects.
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Azzollini, Ilario Antonio. « Analysis of Lead-Acid batteries with a third-order dynamical model ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Trouver le texte intégralRésumé :
Electrical energy storage is a really important issue nowadays. As electricity is not easy to be directly stored, it can be stored in other forms and converted back to electricity when needed. As a consequence, storage technologies for electricity can be classified by the form of storage, and in particular we focus on electrochemical energy storage systems, better known as electrochemical batteries.
Largely the more widespread batteries are the Lead-Acid ones, in the two main types known as flooded and valve-regulated. Batteries need to be present in many important applications such as in renewable energy systems and in motor vehicles. Consequently, in order to simulate these complex electrical systems, reliable battery models are needed. Although there exist some models developed by experts of chemistry, they are too complex and not expressed in terms of electrical networks. Thus, they are not convenient for a practical use by electrical engineers, who need to interface these models with other electrical systems models, usually described by means of electrical circuits.
There are many techniques available in literature by which a battery can be modeled. Starting from the Thevenin based electrical model, it can be adapted to be more reliable for Lead-Acid battery type, with the addition of a parasitic reaction branch and a parallel network. The third-order formulation of this model can be chosen, being a trustworthy general-purpose model, characterized by a good ratio between accuracy and complexity.
Considering the equivalent circuit network, all the useful equations describing the battery model are discussed, and then implemented one by one in Matlab/Simulink. The model has been finally validated, and then used to simulate the battery behaviour in different typical conditions.
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Molyneux, Susan. « Third-order optical nonlinearities of polydiacetylenes studied by sub-picosecond techniques ». Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/1325.
Texte intégral
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Shtyrkova, Katia. « Characterization of third order nonlinearities in TiO₂ waveguides at 1550 nm ». Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79232.
Texte intégralRésumé :
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 71-76).
Polycrystalline anatase titanium dioxide waveguides are investigated as an alternative material for all-optical switching at telecommunications C-band wavelengths. Titanium dioxide does not support two-photon absorption at 1550 nm, has a high refractive index, and a relatively low loss, which allows for high-index-contrast waveguides. The TiO₂ waveguides studied for this thesis were single-mode, with dimensions 200nm x 900nm, deposited on oxidized silicon and overclad with a transparent polymer. The optical Kerr coefficient was measured using two methods: spectral broadening studies and heterodyne pumpprobe experiments. The spectral broadening studies indicated an optical Kerr coefficient of n₂ = 1.82 x 10¹⁵ cm²/W, while the heterodyne pump-probe experiments, yielded a value of n₂ = 1.03 x 10¹⁵ cm²/W. Both techniques and their implementation are described in detail. Split-step code simulations including dispersion and linear loss as well as nonlinearity confirm the internal consistency of each experiment separately. Further experiments are needed to resolve the remaining difference.
by Katia Shtyrkova.
S.M.
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Soar, Gary. « New third-order corrections and large-x resummation in perturbative QCD ». Thesis, University of Liverpool, 2011. http://livrepository.liverpool.ac.uk/4413/.
Texte intégralRésumé :
In this thesis we present third-order corrections to perturbative quantities in inclusive lepton-hadron and lepton-photon deep-inelastic scattering (DIS) and study the resummation of leading contributions to quantities at large values of the scaling variable x. We provide up to third-order the coefficient functions for DIS via the exchange of a scalar-�phi directly coupling only to gluons, realised effectively in the Standard Model by the Higgs boson in the heavy top quark limit, and N_f effectively massless flavours. The functions are shown to exhibit a double-logarithmic enhancement in the large-x limit, with a similar enhancement of leading contributions in the small-x region unlike for the small-x behaviour of the Higgs boson. Consequently in the small-x region, the scalar-phi� probe no longer represents the Higgs boson in the heavy-top limit. The third-order corrections to the photon-parton splitting functions are presented in the MS_bar factorization scheme and the results are also transformed to the DIS_gamma scheme to allow for a physical form of the non-perturbative initial distributions beyond the leading order. They are shown to exhibit a double-logarithmic enhancement in the large-x region. The third-order contributions to the coefficient functions for the photon structure functions F2^gamma and FL^gamma are presented along with the contributions to the scalar-phi counterpart F�phi^gamma up to O(�alpha_em alpha_s^2 ) for electromagnetic and strong coupling constants �alpha_em and �alpha_s respectively. In each case, the expressions also display a double-logarithmic enhancement in the large-x region. Our results presented for lepton-photon DIS then facilitate the evolution of parton densities within the photon allowing us to obtain the inhomogeneous contributions to the photon structure function F2^gamma up to next-to-next-to-leading order (NNLO) accuracy in both the MS_bar and DIS_gamma factorization schemes. The two-loop results for the coefficient functions for F�phi are used to construct the physical evolution kernels for the system (F2, F�phi) of flavour-singlet structure functions, and are shown to be single-logarithmically enhanced at large-x. The conjecture that this feature persists, in conjunction with the large-x behaviour of the participating splitting and coefficient functions, allows for the prediction of the double-logarithmic contributions to the fourth-order singlet splitting functions. These predictions, when used in the construction of the analogous single-logarithmically enhanced physical evolution kernels for the system (F2, FL), yield analogous predictions of the double-logarithmic contributions to the fourth-order longitudinal coefficient functions. The corresponding photonic physical kernels for (F2^gamma , Fphi^gamma) and FLns^gamma are constructed and lead to predictions of the leading contributions to the fourth-order photon-parton splitting functions and the coefficient function for FLns^gamma respectively. Finally, we turn our attention to the large-x resummation of the double-logarithmic contributions to some of the perturbative quantities in lepton-hadron and lepton-photon DIS via two separate methods. The first method, namely using the iterative structure of the unfactorized partonic structure functions, was only employed for resummation to next-to-leading logarithmic (NLL) accuracy and for the quantities in lepton-hadron DIS. The second method uses the functional forms in dimensional regularization of the real- and virtual-emission contributions to the unfactorized partonic structure functions together with the Kinoshita-Lee-Nauenberg (KLN) cancellations required by the mass-factorization theorem, and allows for resummation to next-to-next-to-leading logarithmic (NNLL) accuracy. The second method was applied to quantities in both lepton-hadron and lepton-photon DIS resulting in new resummations to NNLL for the following quantities: P_qg, P_gq, C_2,g, C_phi�,q, C_L,g, P_qgamma and C_2,gamma.
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Lo, Presti Nicola. « Third- and all-order results for semi-inclusive QCD hard processes ». Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/7615/.
Texte intégralRésumé :
In this thesis we present third-order corrections to heavy-quark production in photonexchange deep-inelastic scattering (DIS) and we study the resummation of leading and sub-leading contributions to DIS and other QCD hard processes at large values of the Bjorken variable x. We provide approximate next-to next-to-leading order (NNLO) corrections for the heavy-quark contribution to the structure function F2 in photon-exchange DIS. This is achieved by extending and combining the available NNLO information from different kinematic limits. In particular, we predict the full logarithmic behaviour of the coefficient functions near the threshold of heavy-quark production applying soft-gluon exponentiation (SGE). We utilize available all order-result in the high-energy limit to derive an analytic NNLO expression for the dominant contributions in this limit. Finally from known even integer Mellin moments of the heavy-quark operator matrix elements, as well as from the already mentioned high-energy behaviour, we construct an approximation for the heavy-quark coefficient functions at asymptotically large values of the exchanged momentum squared Q2. By combining these individual results we construct NNLO coefficient functions for heavy-quark DIS which, while still being approximate, represent the most comprehensive results possible at this point. The resulting improvement of the prediction, as well as the low-Q2 small-x limitations of the present NNLO results, are then illustrated in a phenomenological study. In the second part of this thesis we address the all-order resummation of QCD quantities in the large-x limit for which SGE is not applicable. After reviewing the resummation method that will be employed and the already available results for inclusive DIS (for which we will provide a closed analytic formula at next-to-next-to-leading logarithmic (NNLL) accuracy for the first time), we apply this method to electronpositron semi-inclusive annihilation (SIA). Also in this case, closed analytic formulae for the resummed time-like splitting and coefficient functions at NNLL accuracy are presented. This resummation method is then applied to the off-diagonal partonic cross sections in Drell-Yan lepton pair production and in Higgs hadro-production, for which we are able to resum only the leading logarithmic (LL) contributions.
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Fröhler, Magnus. « F.T.O. Den Helige Franciskus Tredje Orden inom Svenska kyrkan ». Thesis, Linköping University, Department of Religion and Culture, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7984.
Texte intégralRésumé :
Detta arbete, inom ämnet Kristendomens historia, presenterar en svenskkyrklig orden, ”Franciskus Tredje Orden inom Svenska kyrkan” (F.T.O.), som tillhör den ”Tredje Orden” (TSSF) inom ”The Society of Saint Francis” (SSF), en ordensgemenskap inom den Anglikanska kyrkan, Church of England. Orden är öppen för kvinnor och män, vigda (biskopar, präster och diakoner) och lekfolk som lever vanliga liv i familj och samhälle, med en vilja att leva sina liv utifrån en tydlig inspiration av den helige Franciskus och hans liv.
Syftet med arbetet är att undersöka och redogöra för de primärkällor som finns från tiden av F.T.O.: s grundande för att svara på frågan om huruvida Ordens uppkomst var förenlig eller ej med den Svenska kyrkan, dess tro, lära och bekännelse.
Undersökningen inleds med en deskriptiv del gällande bakgrunden till frågeställningen där jag redogör något för reformationen och vad detta medförde för Svenska kyrkan gällande klosterliv. Sedan följer en redogörelse och en hermeneutiskt och dogmatisk analys av de, för tiden av Ordens grundande, aktuella källorna.
En sammanfattning av resultatet som framkommit är det att grundandet av F.T.O. i början av 1970-talet var förenligt med den Svenska kyrkan. Vi kan se i källorna att Ordens syfte och annat typiskt för Orden, korresponderar väl med vad som uttrycks gällande tro, lära och bekännelse i Kyrkolagen 1686 och de, förutom Bibeln, samlade bekännelseskrifterna för den Svenska kyrkan. Genom detta arbete konstaterar vi att ett ordensliv likt F.T.O. kan tillämpas inom ett evangeliskt-lutherskt kyrkosamfund och att det på intet sätt är synonymt med den gärningsfromhet inom klosterväsendet som reformatorerna så tydligt vände sig mot under medeltiden.
This study, in the subject the history of Christianity, present an order in the Church of Sweden, “Saint Francis Third Order within the Church of Sweden” (F.T.O.), which is a part of the “Third Order” (TSSF) within “The Society of Saint Francis” (SSF), a community within the Anglican Church, Church of England. The order is open for women and men, ordained (bishops, priests and deacons) and lay people who live ordinary lives in family and society, with a desire to live their lives inspired by Saint Francis and his life.
My purpose with this study is to examine and describe the prime sources from the time of the foundation of the F.T.O. to answer the question about whether the foundation of the Order was compatible or not with the Church of Sweden, their faith, doctrine and confession.
The examination starts with a descriptive part about the background to the study problem where I give some facts about the reformation and what that brings for the Church of Sweden in relation to monastery life. Then comes a description and a hermeneutics and a dogmatic analysis of the, for the time of the foundation of the Order, current sources.
A summery of the upcoming results of this study is that at the foundation of F.T.O. in 1970ths was compatible with the Church of Sweden. In the sources we can see that the Orders purpose and other typical for the Order corresponds well with what they say about faith, doctrine and confession in the church law from 1686 and the, except the holy Bible, confession scripts for the Church of Sweden. Through this work we establish the fact that an order life like that we see in F.T.O. could practices in an evangelical-Lutheran church and it is not in any way synonymic with that phenomena called “action piety” within the monastery life that the men’s of the reformation so clearly said no to under the middle age.
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Gieseking, Rebecca Lynn. « Third-order nonlinear optical properties of polymethine-based materials : a theoretical investigation ». Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53570.
Texte intégralRésumé :
Organic π-conjugated molecules and materials with large real parts and small imaginary parts of the third-order polarizability are of great interest for all-optical switching applications. In this dissertation, we use quantum-chemical and molecular-dynamics approaches to investigate the structure-property relationships that influence the nonlinear optical properties of π-conjugated molecules and materials. We begin with an overview of nonlinear optics, focusing in particular on the electronic properties of linear π-conjugated systems and some of the important problems that have limited device applications of these molecules to date. This is followed by a brief review of the computational methods employed in these studies.
We then turn to the main results of the dissertation. Chapter 3 describes the structural dependence of the transition dipole moment between the first two polymethine excited states. Chapter 4 discusses the relationship between BLA, which depends on the geometric structure, and BOA, which probes electronic structure. Chapter 5 describes the benchmarking of computational methods to describe the symmetry-breaking of long polymethines and preliminary evidence regarding the role of vibrational modes in symmetry-breaking. Chapter 6 explains the negative third-order polarizability of tetraphenylphosphate and analogous systems. Chapter 7 focuses on molecular-dynamics studies of polymethine aggregation, particularly the relationships between chemical structure and the geometric and electronic structures of aggregates. Finally, Chapter 8 provides a synopsis of the work and discussion of further directions.
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Shi, Changgui. « The global behavior of solutions of a certain third order differential equation ». Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/834515.
Texte intégralRésumé :
In computer vision, object recognition involves segmentation of the image into separate components. One way to do this is to detect the edges of the components. Several algorithms for edge detection exist and one of the most sophisticated is the Canny edge detector.Canny [2] designed an optimal edge detector for images which are corrupted with noise. He suggested that a Gaussian filter be applied to the image and edges be sought in the smoothed image. The directional derivative of the Gaussian is obtained, then convolved with the image. The direction, n, involved is normal to the edge direction. Edges are assumed to exist where the result is a local extreme, i.e., where∂2 (g * f) = 0.(0.1)_____∂n2In the above, g(x, y) is the Gaussian, f (x, y) is the image function and The direction of n is an estimate of the direction of the gradient of the true edge. In this thesis, we discuss the computational algorithm of the Canny edge detector and its implementation. Our experimental results show that the Canny edge detection scheme is robust enough to perform well over a wide range of signal-to-noise ratios. In most cases the Canny edge detector performs much better than the other edge detectors.Department of Mathematical Sciences
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Koçak, Hüseyin. « Blow-up and global similarity solutions for semilinear third-order dispersive PDEs ». Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665445.
Texte intégral
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Gopinath, Juliet Tara 1976. « Studies of third-order nonlinearities in materials and devices for ultrafast lasers ». Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33205.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Pages 161-162 blank.
Includes bibliographical references (p. 133-143).
Recent developments in telecommunications, frequency metrology, and medical imaging have motivated research in ultrafast optics. Demand exists for broadband components and sources as well as highly nonlinear fibers and materials. For this thesis, several different devices have been developed for such applications. Broadband saturable absorbers based on III/V and Si materials systems were developed for femtosecond lasers and have high reflectivity over 200 to 300 nm bandwidths. These absorbers were designed for modulation depths ranging from 0.3% to 18%. Self-starting modelocked operation with the absorbers was achieved in a variety of lasers including Ti:Sapphire, Cr:Forsterite, Er:glass, Cr⁴⁺:YAG and erbium-doped bismuth-oxide fiber. In tapered microstructure fiber, highly nondegenerate four-wave mixing was achieved, with a frequency shift of 6000 cm⁻¹ in an interaction length of only 1.4 cm. Amplification in erbium-doped bismuth-oxide fiber was demonstrated, with gains of 12 dB achieved between 1520 - 1600 nm in a 22.7-cm length. With a 55.6 cm length of bismuthoxide erbium-doped fiber, an L-band modelocked laser was constructed, tunable between 1570 - 1600 nm. It produced 288-fs pulses at 1600 nm. Undoped highly nonlinear bismuthoxide fiber was used to generate smooth, controlled supercontinuum between 1200 to 1800 nm.
(cont.) Pulse compression of 150-fs pulses to 25 fs was also demonstrated. Finally, the nonlinear refractive index coefficient and two-photon absorption coefficient of Ge-As-Se glasses were measured. Ge₃₅As₁₅Se₅₀ is found to have a nonlinearity 900 times that of silica.
by Juliet Tara Gopinath.
Ph.D.
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Humphrey, Jonathan L. « Enhancing the Third-Order Nonlinear Optical Properties of Porphyrins and Molecular Wires ». VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/969.
Texte intégralRésumé :
The third-order nonlinear optical (NLO) properties of indium tin oxide (ITO) thin films, Fe3+, Mn3+, Co2+ 5,10,15,20-tetrakis-4hydroxytetraphenyl)porphyrin (TPP) films, and a series of ethynyl-linked azobenzene oligomers were investigated using degenerate four wave mixing (DFWM) with 100 fs laser pulses. To measure the NLO of ITO thin films, A DFWM method for measuring thin films on thick substrates was refined for the characterization of films less than 100 nm thick and applied to ITO films ~25 nm thick. It was found that the third-order nonlinear susceptibility of ITO, χ(3)ITO, is purely electronic at 900 - 1300 nm (11000 - 7700 cm-1) and has a value of (2.16 ± 0.18) x 10-l8 m2 V-2. The χ(3)IT0 value reaches (3.36 ± 0.28) x 10-l8 m2 V(sup>-2 at 1500 nm (6700 cm-1) due to two-photon absorption by free carriers (electrons). Ultrafast electron relaxation was also observed. The ~100 fs lifetime of this process could reflect electron scattering in the conduction band. This DFWM method was also used to investigate the two-photon properties of ~500 nm thick electropolymerized films of Fe3+, Mn3+, and Co2+ TPP in the near-IR spectral region. Metalloporphyrins with strong charge transfer (CT) transitions inthe linear absorption spectra also show enhanced two-photon absorption. (Metalloporphyrin two-photon absorption cross section, δ, increases >10 times over that for the metal free porphyrin.) This effect was attributed to a two-photon induced charge transfer between the metal ion's d orbitals and the π-system of the porphyrin. Correlationof one- and two-photon absorption properties of transition metal porphyrins suggests a new and simple approach to improve organic materials for photonic applications. Finally, a series of oligomers consisting of ethynyl-linked azobenzene units was prepared using Pd-catalyzed cross coupling. The linear and nonlinear optical properties of the oligomers were investigated. The molecular second hyperpolarizability, γ, followed the power law γσ n2.12±0.05 (n is number of repeat units) for unusually large molecular lengths. The exceptional exciton delocalization length exceeds 360 conjugated bonds (>49 nm) and is attributed to the rigidity of the conjugated backbone.
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Robson, Andrew Peter. « A third order analysis of a low temperature differential Ringbom-Stirling engine ». Thesis, Edinburgh Napier University, 2007. http://researchrepository.napier.ac.uk/Output/4167.
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Serna, Otálvaro Samuel Felipe. « Design and characterization of Silicon Photonic structures for third order nonlinear effects ». Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS409/document.
Texte intégralRésumé :
Le présent travail a été consacré à l'étude des non linéarités de troisième ordre dans des structures intégrées à base de silicium exploitant des configurations de cavités à miroir de Bragg (nanobeam) et guides à cristaux photoniques à modes lents. Tout d'abord, nous avons développé une méthode non destructive à faisceau unique pour caractériser les effets de troisième ordre instantanés, c’est-à-dire la quantification de la susceptibilité complexe effective dans les guides d'ondes. La méthode a été dénommée "Top-hat D-Scan bi-directionnelle" et constitue un analogue temporel de la méthode Top-hat Z-Scan développée précédemment. Nous avons établi un modèle analytique et numérique et nous rendons compte de la première mesure d'un guide d'ondes en silicium utilisant une impulsion mis en forme dans un étireur et complétée par une procédure d’injection bi-directionnelle. L’ensemble instrumental développé constitue une expérience de métrologie des effets non-linéaires dans des guides d’ondes silicium au meilleur niveau de l’état de l’art. La méthode proposée a été validée dans des guides SiGe, chalcogénures et nitrure du silicium. Forts de cet outil métrologique, nos travaux d’exploration des interactions non linéaires lumière-matière ont été consacrés à deux grandes familles de nanostructures photoniques : des microcavités optiques et guides d'ondes en régime de lumière lente. Dans la première des deux situations, les variations d'indice provoquées par les non linéarités sont responsables d’un décalage des fréquences de résonance excluant sa coïncidence avec la fréquence du signal d'excitation et diminuant ainsi l'efficacité de l'injection optique de manière drastique. Afin de maintenir le bénéfice de localisation de la lumière tout au long de l'excitation pulsée, nous avons expérimentalement et numériquement étudié le comportement d'une cavité en silicium conçue, fabriquée, et enfin excitée par une impulsion présentant une puissance crête élevée. En contrôlant temporellement la phase des composantes spectrales injectée, la relation de phase spectrale compensant la dérive de fréquence non linéaire de la résonance de la cavité, nous avons effectué la première démonstration expérimentale de l'excitation cohérente d'une micro-cavité silicium non linéaire. Enfin, nous avons consacré des efforts importants pour concevoir, fabriquer et caractériser des guides d'ondes à cristaux photoniques (SPhCW) en silicium à fente, matrice d’une intégration hybride de matériaux optiques non-linéaires sur silicium. Les résultats rapportés fournissent la première preuve expérimentale d’un contrôle précis des propriétés de dispersion de guides à cristaux photoniques à fente propres à être remplis par des matériaux souples comme des polymères ou des couches minces dopées. La dispersion de groupe des modes lents guidés est contrôlable en signe et en amplitude et correspond à des bandes passantes optiques exploitables (~10nm). Ces résultats démontrent l’intérêt direct pour le traitement des données tout-optique sur puce des guides à modes lents à cœur creux utilisant des effets optiques non linéaires d’ordre trois pour le traitement tout-optique des données sur puceAll-optical signal processing implemented in silicon photonics is considered as a promising route to solve several bottlenecks for the realization of future dense and mixed integrated electronic and photonic chips including ultrahigh data bit rate issues and power consumption constraints. In the context of the planar silicon photonics technology, a dramatic reduction of the needed power to reach optical nonlinear effects is obtained due to the sub-micrometer size of silicon wires (~450nmX260nm) in the telecommunication wavelength window, although silicon does not exhibit second-order response (χ^((2))) due to the centrosymmetry of its lattice. Moreover, third-order effects (χ^((3))) are partially spoiled in this material due to the strength of the two-photon-absorption (TPA) effect, which in turn generates free-carriers inducing additional absorption and refractive index changes. One way to overcome this limitation is the hybrid integration on silicon of low index soft materials with luminescence or nonlinear optical properties lacking to silicon. In this context, the present work is devoted to the study of third order nonlinearities in silicon-based integrated structures exploiting enhanced electromagnetic field effects (e.g. in Si resonators and slow light waveguides). First, we have developed a dedicated single beam non-destructive method to characterize the instantaneous third order effects though the quantification of complex effective waveguide susceptibility. The method is named “Bi-directional top-hat D-Scan” and consists on a temporal analogous of the top-hat Z-Scan. We have established an analytical and numerical model and we report the first measurement of a silicon waveguide by using a pulse shaping set-up and a bi-directional procedure. The originality of our methods stands in the capability to measure in two steps : the 3rd order nonlinear Figure-Of-Merit (FOM) independently of the injection losses, and the effective nonlinear waveguide parameters (Kerr and TPA) taking into account measured coupling losses at each facet. Furthermore, we apply the method to other integrated novel materials including Ge-rich GeSi alloys, carbon nanotube doped thin films, and chalcogenide waveguides. Additionally, two further enhancements of light-matter nonlinear interactions have been explored within this work: optical microcavities and slow light waveguides. In the first picture, index variations caused by non-linearities shift the resonance frequencies precluding the coincidence with the excitation signal frequency, thereby decreasing the injection efficiency. In order to maintain the benefit of light localization throughout the pulsed excitation, we have experimentally and numerically studied the behavior of a designed and fabricated silicon nanobeam cavity excited by a high power tailored chirped pulse whose spectral phase relation compensates for the nonlinear frequency drift of the cavity resonance. We report a numerical study of this first experimental demonstration of the coherent excitation of a nonlinear micro-cavity, leading to an enhanced intra-cavity nonlinear interaction. Finally, we have dedicated efforts to engineer, fabricate and characterize silicon slot photonic crystal waveguides (SPhCW) in order to compensate their strong dispersion present in the slow light regime while taking benefit from large group index light propagation. We showed that their frequency dispersion properties can be engineered from anomalous to normal dispersion, along with zero group velocity dispersion (ZGVD) crossing points exhibiting a Normalized Delay Bandwidth Product (NDBP) as high as 0.156. The reported results provide the first experimental evidence for an accurate control of the dispersion properties of fillable periodical slotted structures in silicon photonics, which is of direct interest for on-chip all-optical data treatment using nonlinear optical effects in hybrid-on-silicon technologies
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Dimopoulos, Ilias. « A nonlinear study of the gain margin of a third order regulator system ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277296.
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Pajunen, Anni. « Child Home Care Allowance : Transition to Second- and Third-Order Births in Finland ». Thesis, Stockholms universitet, Sociologiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-78294.
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In this study, I study the relationship between the use of the child home care allowance and second and third births among women aged 19-44 in Finland. I use register data from the Finnish Census Panel (FCP) on 254 465 women who had a second or third child during 1993 to 2007. I apply discrete-time event-history analysis to examine whether women using the child home care allowance while their previous child was under the age of three have a higher risk to proceed to subsequent childbearing – second and third births – than those not using the allowance while their previous child was under the age of three. The analysis is conducted separately for second and third births. The results show that the use of the child home care allowance has an effect on the risk of subsequent child, and that women using the child home care allowance have a higher risk of having a second and a third child than women not using the allowance. Also, the risk of having a second child is found to be higher than having a third child. According to the findings, timing matters. There are differences in how soon women get their subsequent child, and not only whether they get a second and third child or not. These differences are not explained by the control variables. However, the analysis does not demonstrate any causality between the use of the allowance and subsequent childbearing. The impact of the use of the allowance on childbearing may be due to selection effects.
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Théberge, Francis. « Third-order parametric processes during the filamentation of ultrashort laser pulses in gases ». Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24401/24401.pdf.
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Furuhashi, Takeshi, Tomohiro Yoshikawa et Hiroaki Masai. « A visualization method of third-order tensor for knowledge extraction from questionnaire data ». IEEE, 2013. http://hdl.handle.net/2237/20712.
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Portier, Sarah. « Implementation of Third Order Plate Theory for use in Existing Finite Element Software ». Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/79680.
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Sandwich plates and layered composites are common in many structural applications because of their combination of high stiffness and low weight. These plates combine top and bottom layers of high Young's modulus with intermediate layers of material carrying predominantly shear loads. Finite elements developed for the analysis of sandwich plates need to accurately model transverse shear stresses through the plate thickness.
This study was inspired by an Office of Naval Research project to investigate the suitability of steel sandwich plates as ship hulls. A finite element implementation based on a third-order shear deformation element was used in a standard finite element program to model transverse shear stresses in a simply supported plate. Four elements based on third-order theory are developed and tested.
Using static condensation to reduce the number of degrees of freedom required by a third-order plate element does not preserve the element's accuracy in either displacements or stresses, and stresses do not converge with refinement of the mesh. For the thin isotropic plate case, some condensed elements give reasonable displacement and stress results, but only for certain choices of mesh and the element is less versatile than one based on first order plate theory. None of the condensed elements give good results for composite plates of any thickness.Master of Science
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Zhang, Pei. « Beam position diagnostics with higher order modes in third harmonic superconducting accelerating cavities ». Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/beam-position-diagnostics-with-higher-order-modes-in-third-harmonic-superconducting-accelerating-cavities(587aa24b-8adc-4bc6-8f5c-475aa0028d06).html.
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Higher order modes (HOM) are electromagnetic resonant fields. They can be excited by an electron beam entering an accelerating cavity, and constitute a component of the wakefield. This wakefield has the potential to dilute the beam quality and, in the worst case, result in a beam-break-up instability. It is therefore important to ensure that these fields are well suppressed by extracting energy through special couplers. In addition, the effect of the transverse wakefield can be reduced by aligning the beam on the cavity axis. This is due to their strength depending on the transverse offset of the excitation beam. For suitably small offsets the dominant components of the transverse wakefield are dipole modes, with a linear dependence on the transverse offset of the excitation bunch. This fact enables the transverse beam position inside the cavity to be determined by measuring the dipole modes extracted from the couplers, similar to a cavity beam position monitor (BPM), but requires no additional vacuum instrumentation.At the FLASH facility in DESY, 1.3 GHz (known as TESLA) and 3.9 GHz (third harmonic) cavities are installed. Wakefields in 3.9 GHz cavities are significantly larger than in the 1.3 GHz cavities. It is therefore important to mitigate the adverse effects of HOMs to the beam by aligning the beam on the electric axis of the cavities. This alignment requires an accurate beam position diagnostics inside the 3.9 GHz cavities. It is this aspect that is focused on in this thesis. Although the principle of beam diagnostics with HOM has been demonstrated on 1.3 GHz cavities, the realization in 3.9 GHz cavities is considerably more challenging. This is due to the dense HOM spectrum and the relatively strong coupling of most HOMs amongst the four cavities in the third harmonic cryo-module. A comprehensive series of simulations and HOM spectra measurements have been performed in order to study the modal band structure of the 3.9 GHz cavities. The dependencies of various dipole modes on the offset of the excitation beam were subsequently studied using a spectrum analyzer. Various data analysis methods were used: modal identification, direct linear regression, singular value decomposition and k-means clustering. These studies lead to three modal options promising for beam position diagnostics, upon which a set of test electronics has been built. The experiments with these electronics suggest a resolution of 50 micron accuracy in predicting local beam position in the cavity and a global resolution of 20 micron over the complete module. This constitutes the first demonstration of HOM-based beam diagnostics in a third harmonic 3.9 GHz superconducting cavity module. These studies have finalized the design of the online HOM-BPM for 3.9 GHz cavities at FLASH.