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Sirikitputtisak, Tule. "Molecular simulation study of noble gas + n-decane binary mixtures at reservoir conditions." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/molecular-simulation-study-of-noble-gas--ndecane-binary-mixtures-are-reservoir-conditions(6ff06bf5-5bd4-4429-8c42-3ca96b4347c4).html.
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Carbon capture and sequestration are considered to be a temporary fix to the climate change global crisis. Following the noble gas tracers injection field experiment at Salt Creek in the state of Wyoming, USA, these tracers may be used to characterise the reservoir as a potential geological sequestration site for carbon dioxide. This study aims to investigate various thermodynamics properties of the five noble gases (Xe, Kr, Ar, Ne, and He) in n-decane at reservoir conditions (340 K – 460 K and 10 MPa – 200 MPa). The study utilises the SKS force field to describe n-decane and both Gibbs Ensemble Monte Carlo and molecular dynamics simulations were used to investigate the solubility, diffusivity, and vapour-liquid equilibrium of the five binary mixtures. The size of the noble gases was found to be important in these nonpolar mixtures where typical interactions are weak and short-ranged. The enthalpies of solvation were calculated and found to be directly correlated to the size of the solute where the energy required for the formation of a cavity to accommodate the solute is compensated by the nature of the intermolecular interaction between solvent and solute. The mixture of Ar + n-decane is of interest particularly because the sigma value for Ar is very similar to that of the CH3 group, resulting in the overall non-mononicity of several thermodynamics properties. Additionally, maxima in enthalpies of solvation were observed in Xe and Kr in n-decane solution at 200 MPa. While these maxima were observed in two different species at similar conditions, they are accommodated by unusually high uncertainties - further investigation is required before definitive conclusions can be drawn. The results from the vapour-liquid equilibrium study of the five noble gas + n-decane binary mixtures were in good agreement with the Peng-Robinson equation of state predictions. What is more, the diffusion coefficient ratios amongst the five noble gases in n-decane were investigated in light of Stoke-Einstein’s relation and Enskog’s hard-sphere relation. Three different radii of solute-solvent interaction were investigated and the best fit was observed when R =radius of solute + radius of gyration of n-decane. Additionally, the diffusion coefficients were utilised in the reservoir simulation to investigate the role of diffusion within the reservoir.
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Hodges, Stephen Lee. "The Synthesis of Hindered Aliphatic Ketones for the Future Production of Spiro [4.5] Decane Sesquiterpenes." W&M ScholarWorks, 1986. https://scholarworks.wm.edu/etd/1539625343.
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Hedin, Niklas. "NMR studies of complex fluids and solids formed by surfactants." Doctoral thesis, KTH, Chemistry, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3033.
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NMR methods have been designed and employed in studying ofcomplex liquids and solids formed by surfactants. PGSE NMRexperiments are easily biased by convection; this artifact canbe avoided by changing the sample holder and by usingconvection-compensated pulse sequences. The temperaturedistribution within samples was controlled using thetemperature dependent order parameter for CBr2H2dissolved in a thermotropic nematic solvent.Electronic ringing that often spoils accurate NMR experimentsfor broad lines was removed by the using composite pulses andquadrupole echo sequences with appropriate phase cycles.
Field-dependent81Br and35Cl NMR relaxation studies in micellar solutions ofC16TAX surfactants showed that the structure ordynamics of the hydration shell is more influenced by thesurfactant cation for bromide than for chloride, in agreementwith their position in the Hoffmeister series. The presence ofa small but significant frequency-dependent relaxation showedthat the lateral self diffusion of the anions may be reduced ascompared to its bulk value in diluted solutions but only with afactor of 1.0 - 2.5. The ions are clearly not "bound" to thesurface. A field-dependent2H NMR relaxation study on the CTABr-α-d2and benzene-d6showed an initial one-dimensional micellargrowth followed by the appearance of microemulsion droplets onaddition of benzene. The local mobility of the benzene wasreduced when solubilized in small amounts, consistent with aninitial average location of benzene at the micellar interface.The surfactant diffusion coefficients fromconvection-compensated PGSE NMR experiments in the C12E8-D2O system showed monotonous growth of the micellesupon increasing temperature. Emulsion droplets in the C12E5-decane-D2O system where shown to coarsen according to theOstwald ripening theory after being brought out of equilibriumby a temperature drop. X-ray scattering and2H NMR line-shape and relaxation experimentssuggested that complex solids formed by a partly-sulfatedpolysaccharide and CnTAB exhibit regular ordering at both microscopicand mesoscopic length scales.
Keywords: CTAB, CTAC, C12E8, C12E5, decane, benzene, CBr2H2, polysaccharide, micelle, microemulsion, emulsion,Ostwald ripening, NMR,81Br,35Cl,2H, field- dependent spin relaxation, PGSE, selfdiffusion, convection, ringing, thermometer, generalized Blochequations, EXORCYCLE, quadrupole echo, SAXS, WAXS, cryo-TEM.
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Wu, Yue. "High-Pressure and High-Temperature Density Measurements of n-Pentane, n-Octane, 2,2,4-Trimethylpentane, Cyclooctane, n-Decane, and Toluene." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2286.
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Information on the density of hydrocarbons at high pressures and temperatures is of great importance in many fields, such as the study of ultra-deep reservoirs up to ~240 MPa and 250°C. However, density data at such high pressures and temperatures are often not available in the literature. In this study, experimental densities are reported for n-pentane, n-octane, 2,2,4-trimethylpentane, cyclooctane, n-decane, and toluene to ~280 MPa and ~250°C. These experimental densities are in good agreement with available literature data, although the literature data for many of these fluids do not extend to the pressures and temperatures utilized in this study.
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Peres, Durand Sylvie. "Etude physico-chimique de l'élaboration de gels de titane par le procédé PEM en milieu micellaire inverse decane/TX35/H2O-H2O2." Montpellier 2, 1993. http://www.theses.fr/1993MON20207.
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Nous avons caracterise les gels de titane formes par le procede sol-gel, en milieu micellaire inverse decane/tx35/h(2)o-h(2)o(2). L'isopropoxyde de titane, solubilise dans le decane, polymerise par un mecanisme d'hydrolyse et de condensation avec une vitesse qui est controlee par la frequence des echanges inter-micellaires, et par la quantite d'eau oxygenee contenue dans les micelles inverses. L'etude physico-chimique de la solution micellaire inverse par viscosite et par diffusion de la lumiere montre qu'elle est constituee de petits agregats de forme allongee, qui ne solubilisent que 8 molecules d'eau oxygenee par molecule de tensioactif (tx35). Nous avons determine les cinetiques de gelification de l'oxyde de titane en fonction de 3 parametres experimentaux, le taux d'hydratation de la micelle, n, le taux d'hydrolyse de l'alcoxyde, h, et la molalite de l'alcoxyde, m. La formation des gels, en presence d'eau oxygenee, est plus rapide que lorsqu'on utilise l'eau, dans les memes conditions de h, n et m. L'etude physico-chimique des gels par differentes techniques comme l'analyse thermique, la diffraction des rayons x et des electrons, les isothermes d'adsorption, la microscopie electronique, la thermoporometrie et la diffusion centrale des rayons x, montrent que les gels fabriques en presence d'eau oxygenee ont une meilleure resistance mecanique que ceux formes en presence d'eau; ce sont des solides mesoporeux dont les pores, en forme de bouteille, ont un diametre de 4 nm. Les agregats primaires (dont la taille est d'environ 100 nm) sont constitues de barreaux interconnectes de 2 nm de longueur. Ils ont une structure fractale, et sont formes par un processus d'agregation amas-amas controle par la reaction chimique
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Mesquita, Francisca Maria Rodrigues. "Study of solvents alternative for aromatic extraction." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14637.
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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel SuperiorAromatic hydrocarbons are chemical compounds of great interest in the petrochemical industry. These are commonly derived from reformed naphtha, which are in multicomponent mixtures with aliphatic hydrocarbons. The separation of these components is realized, generally, the liquid-liquid extraction process. In this process, the sulfolane is the most widely used solvent. However, this has some disadvantages such as high cost. For this reason, many studies are developed by the academic community in order to propose alternative solvents to replace the exclusive use of sulfolane by compounds that are important features like good selectivity, easy recoverability and low costs. Given the above, this study main aims to determine liquid-liquid equilibrium data (LLE) to study the ability of solvents [diethylene glycol (DEG), triethylene glycol (TEG), glycerol and 2-hydroxyethyl amine format (2-HEAF)] in extracting aromatic mixtures with aliphatic. The physical properties also of great importance in the understanding of the behavior and interactions that occur in liquid mixtures. Thus, in this study were also studied the density and viscosity of solvent extractors aromatic. The experimental methodology for the determination of LLE data was initially validated by reproducing the literature, and the results showed good agreement between these data. After the method has been validated, solubility curves and tie-lines were constructed for systems containing decane + toluene + DEG (+ TEG, + glycerol, + 2-HEAF, + sulfolane) at T = (303.15 and 333.15) K. The composition data of tie-lines, obtained experimentally, were used to calculate the selectivity parameter and the distribution coefficient. With this data, it can be concluded that all the solvents studied have a good capacity for toluene extraction from mixtures with decane. However, the glycerol has presented as the most promising solvent for aromatics extraction. Finally, the experimental data were correlated through the thermodynamic activity coefficient models, NRTL and UNIQUAC. The results were considered satisfactory, noting that the NRTL was the model that presented minor deviations in compositions. Thus, best represented the LLE data for the systems studied.
Os hidrocarbonetos aromÃticos sÃo compostos quÃmicos de grande interesse na indÃstria petroquÃmica. Estes sÃo comumente originados da nafta reformada, onde encontram-se em misturas multicomponentes com hidrocarbonetos alifÃticos. A separaÃÃo destes componentes à realizada, em sua grande maioria, pelo processo de extraÃÃo lÃquido-lÃquido. Nesse processo, o sulfolano à o solvente mais utilizado. No entanto, este apresenta algumas desvantagens, tais como alto custo. Por esse motivo, inÃmeros estudos sÃo realizados pela comunidade acadÃmica a fim de propor solventes alternativos que substituam o uso exclusivo do sulfolano por compostos que tambÃm apresentem caracterÃsticas importantes, como boa seletividade, boa recuperabilidade e baixos custos. Diante do exposto, o presente trabalho tem como principal objetivo determinar dados de equilÃbrio lÃquido-lÃquido (ELL) para estudar a capacidade dos solventes [dietilenoglicol (DEG), trietilenoglicol (TEG), glicerina e 2-hidroxietilamina formato (2-HEAF)] em extrair aromÃticos das misturas com alifÃticos. As propriedades fÃsicas tambÃm assumem extrema importÃncia no conhecimento do comportamento e das interaÃÃes que ocorrem nas misturas de lÃquidos. Deste modo, neste trabalho foram estudados a densidade e a viscosidade de solventes extratores de aromÃticos. A metodologia experimental para obtenÃÃo dos dados de ELL foi inicialmente validada reproduzindo dados da literatura, e os resultados mostraram uma boa concordÃncia entre estes dados. ApÃs a metodologia ter sido validada foram construÃdas curvas de solubilidade e tie-lines para os sistemas contendo decano + tolueno + DEG (+ TEG, + glicerina, + 2-HEAF, + sulfolano) a T = (303,15 e 333,15) K. Os dados de composiÃÃo das tie-lines, obtidos experimentalmente, foram utilizados para calcular o parÃmetro de seletividade e o coeficiente de distribuiÃÃo. De posse desses dados, pode-se concluir que todos os solventes estudados apresentam boa capacidade para extraÃÃo de tolueno a partir de misturas com decano. No entanto, a glicerina destacou-se como o solvente mais promissor para a extraÃÃo de aromÃticos apresentando os maiores valores para seletividade. Finalmente, os dados experimentais foram correlacionados atravÃs dos modelos termodinÃmicos de coeficiente de atividade, NRTL e UNIQUAC. Os resultados foram considerados satisfatÃrios, observando-se que o NRTL foi o modelo que apresentou os menores desvios na composiÃÃo. Dessa forma, representou melhor os dados de ELL para os sistemas estudados.
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Kurman, Matthew S. Cernansky N. P. Miller David L. "The preignition oxidation chemistry of n-decane and n-dodecane in a pressurized flow reactor and their use as jet fuel surrogate components /." Philadelphia, Pa. : Drexel University, 2010. http://hdl.handle.net/1860/3256.
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Gola, Annabelle. "Influence des techniques de desalumination de la zeolithe y sur ses proprietes physicochimiques et sur ses performances catalytiques en hydrocraquage du n-decane." Paris 6, 1996. http://www.theses.fr/1996PA066824.
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Des echantillons de zeolithe y desaluminee possedant une teneur constante en atomes d'aluminium de charpente et des quantites variables en especes extra-charpente ont ete prepares et caracterises. Le role des efal en hydrocraquage a ete etudie. Les methodes employees pour desaluminer la zeolithe y consistent en un steaming suivi de traitements par des solutions aqueuses d'acide nitrique, d'hexafluorosilicate d'ammonium ou d'acide ethylenediaminetetraacetique disodique. La composition chimique des echantillons obtenus montre que seules les solutions d'hexafluorosilicate d'ammonium ou d'acide ethylenediaminetetraacetique disodique permettent d'eliminer une quantite variable d'efal en conservant le rapport (si/al) de charpente constant. Differentes natures d'efal sont mises en evidence. Leur localisation, ainsi que la facilite d'extraction par les differents reactifs sont proposees. Le volume mesoporeux des echantillons traites a l'acide nitrique et l'edta disodique augmente, alors que l'hexafluorosilicate d'ammonium conduit a un depot de silice. L'acidite de la zeolithe steamee est plus faible que celle des autres, en nombre et en force. La reaction choisie pour l'etude catalytique est l'hydrocraquage du n-decane, sous haute pression d'hydrogene et a 260c. Les catalyseurs bifonctionnels sont prepares par deux methodes differentes : melange mecanique de platine sur alumine et de zeolithe, ou impregnation a sec de platine sur la zeolithe. Dans ce dernier catalyseur, la distance des sites actifs hydrogenants et acides est faible, ce qui conduit a de forts rendements en produits isomerises du n-decane. La teneur en efal, leur nature, la texture et l'acidite des zeolithes ont peu d'influence sur les performances catalytiques. Seule la zeolithe steamee conduit, dans certaines conditions, a une activite et/ou une selectivite plus faible.
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Kumar, Kamal. "Global Combustion Responses of Practical Hydrocarbon Fuels: n-Heptane, iso-Octane, n-Decane, n-Dodecane and Ethylene." online version, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1169746809.
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BOUASKARNE, MOHAMED. "Structure et thermodynamique des supensions colloidales : sur l'analyse de l'interaction effective dans les approches de type fluide monocomposant. exemple de la microemulsion eau/aot/decane." Paris 12, 2000. http://www.theses.fr/2000PA120023.
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L'objectif de ce travail est d'analyser le potentiel effectif intermicellaire dans les microemulsions a partir de l'exemple de la microemulsion eau/aot/decane. Dans une premiere etape, nous avons considere les approches de type de fluide effectif, dans lesquelles les parametres du potentiel effectif sont deduits de l'experience par ajustement sur les donnees de diffusion de rayonnements aux petits angles, la courbe de coexistence et les mesures de conductivite. Nous avons souligne que l'analyse structurale ne permet pas a elle seule de trancher sur la portee de l'interaction effective regnant dans ces systemes. Par ailleurs, lors de l'etude des lignes de coexistence et de percolation experimentales, il est necessaire de preserver la dependance en densite de l'intensite de cette interaction, telle qu'elle resulte de l'ajustement des facteurs de structure aux petits angles. Il apparait alors que cette interaction est d'intensite moderee, variant a la fois avec la densite et la temperature, et est de relativement longue portee. Afin de comprendre ces deux dernieres caracteristiques, nous avons suppose dans une deuxieme etape que la microemulsion est un melange binaire solute/solvant. A partir de modeles des interactions solvant-solvant et solvant-solute de type potentiel de lennard-jones ou de yukawa, nous calculons le potentiel induit par le solvant, a dilution infinie du solute, par les theories standard des melanges. A ce potentiel, nous ajoutons le potentiel direct intermicellaire (recouvrement des chaines du tensioactif, fluctuations de charge, etc) pour obtenir le potentiel total intermicellaire. Nous comparons alors les seconds coefficients du viriel de ce potentiel a celui deduit de l'analyse en terme du fluide effectif, a differentes temperatures et pour differentes combinaisons des parametres d'intensite et de portee. Nous avons souligne la necessite de traiter les differentes contributions a des echelles comparables. Il devient alors possible de comprendre au moins qualitativement l'origine de l'intensite, la portee et la variation en temperature du potentiel effectif. Cette etude souligne cependant les difficultes des approches microscopiques de ces milieux complexes.
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Holl, Tobias [Verfasser], and Jens [Akademischer Betreuer] Weitkamp. "Competitive hydroconversion of decalin and n-decane on noble-metal catalysts and the evaluation of molybdenum carbide as ring-opening catalyst / Tobias Holl. Betreuer: Jens Weitkamp." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1049688864/34.
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Riston, Jose Roberto. "Estudos visando a sintese estereosseletiva do alcaloide 275A." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249249.
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Orientador: Ronaldo Aloise PilliDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-08T12:16:22Z (GMT). No. of bitstreams: 1 Riston_JoseRoberto_M.pdf: 1975890 bytes, checksum: 83dd322a0b88c53adac5195340f43a5f (MD5) Previous issue date: 2006
Resumo: Este trabalho trata de estudos visando à síntese estereosseletiva do alcalóide 275A (18, Figura 1). Esse alcalóide foi isolado por Daly e colaboradores da pele de pequenas rãs venenosas neotropicais da família Dendrobatidae em 1986. Sua estrutura possui um núcleo 1-azabiciclo[5.3.0]decano de grande importância sintética. Para construção desse núcleo utilizamos, principalmente, as reações de a-amidoalquilação e de metátese de olefinas de fechamento de anel (RCM), tendo como reagente inicial a (S) prolina (57) Esquema1
Abstract: This work consists in studies toward the stereoselective synthesis of alkaloid 275A (18, Figure 1). This alkaloid was isolated by Daly and co-workers from the skin of neotropical poison little frogs of Dendrobatidae family in 1986. His structure has an 1-azabicyclo[5.3.0]decane nucleus of great synthetic importance. To construct this nucleus we used, mainly, a-amidoalkylation reactions and ring close metathesis (RCM), starting with (S) proline (57, Scheme 1)
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Quimica Organica
Mestre em Química
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Heuchel, Moritz [Verfasser], and Yvonne [Akademischer Betreuer] Traa. "Co-catalytic cracking of n-decane and 2-ethylphenol as model hydrocarbons for fossil- and bio-based feeds in FCC over zeolite catalysts / Moritz Heuchel ; Betreuer: Yvonne Traa." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2018. http://d-nb.info/1156902037/34.
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Zhou, Honggang. "Mesure et modélisation de la masse volumique et de la viscosité d'hydrocarbures et de leurs mélanges en fonction de la pression." Pau, 1988. http://www.theses.fr/1988PAUU3005.
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La viscosité dynamique de six n-alcanes, de trois alkylbenzènes et de mélanges binaires et quaternaires d'alcanes est mesurée a l'aide d'un viscosimètre a corps chutant, à différentes températures et des pressions allant jusqu'a 1000 bars. Plusieurs modèles, reliant la viscosité a la température, a la pression et a d'autres grandeurs caractéristiques des produits sont proposes et compares. Une nouvelle méthode de calcul de la masse volumique basee sur l'équation d'état de simha est developpée. Elle est appliquée au calcul de la masse volumique de cinq alkylbenzènes. Les résultats sont en très bon accord avec les valeurs mesurées a des températures comprises entre 20**(o) c et 80**(o) c pour des pressions allant jusqu'a 400 bars
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Macé, Frédéric. "Approche efficace des thapsigargines (guaianolides) et synthèse d'azulènes rouges via un intermédiaire commun de type bicyclo[5.3.0]décane." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENV054/document.
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La cycloaddition [2+2] du dichlorocétène sur le 7-méthylcycloheptatriène conduit, après expansion de cycle au diazométhane et déshydrohalogénation, à une -chlorotriénone, ceci de manière très sélective. Cet intermédiaire s'est montré très efficace par le passé dans la synthèse de sesquiterpènes naturels possédant le squelette bicyclo[5.3.0]décane (guaianes, guaianolides, azulènes…). Nous avons utilisé cette méthodologie dans une approche synthétique des thapsigargines, des guaianolides naturels à la structure complexe dont un dérivé est à l'étude contre le cancer de la prostate. Nos recherches et notre savoir-faire nous ont permis d'accéder à un intermédiaire avancé pouvant mener à cette famille de composés, il possède les groupements, insaturations et configurations clé nécessaires. Il peut par ailleurs servir de plateforme idéale pour accéder à des azulènes naturels. Nous avons alors en paralèle synthétisé des azulènes bleu, violet et rouge (dont il s'agit de la première synthèse pour ces derniers)The [2+2] cycloaddition of dichloroketene and 7-methylcycloheptatriene, followed by ring expansion with diazomethane and dehydrohalogenation, affords -chlorotrienone with high selectivity. In the past, this compound proved to be very efficient in the synthesis of natural sesquiterpenes containing the bicyclo[5.3.0]decane squeletton (guaianes, guaianolides, azulenes…). This methodology was used in an efficient synthetic approach of thapsigargins, which are complex guaianolides currently studied to treat prostate cancer via a derivative. Our work led us to get an advanced intermediate for this family, with key moities and configurations. It can also be used to access to natural azulenes. Then we synthetized blue, purple and red azulenes (the first ones for the latters)
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Muscroft-Taylor, Andrew Clive. "Investigations of the type ii intramolecular Diels-Alder reaction directed toward natural product synthesis." Thesis, University of Canterbury. Chemistry, 2006. http://hdl.handle.net/10092/1290.
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This thesis describes synthetic studies directed towards the total synthesis of the nakafuran and florlide marine natural products. Chapter One provides an overview of the importance of natural products to current medicinal chemistry and describes how the "supply issue" associated with these biologically derived compounds can be resolved through the process of total synthesis. Two families of marine natural products, the nakafurans and the florlides, are introduced as synthetic targets and strategies utilising a type II intramolecular Diels-Alder (IMDA) reaction to achieve their total synthesis are delineated. The efficient preparation of regio- and stereodefined vinyl coupling fragments via hydrostannylation and hydrohalogenation methodology is described in Chapter Two. The palladium-catalysed cross-coupling of these fragments, via Stille or Negishi coupling methodology, yielded dienes which were successfully advanced to IMDA triene precursors. Chapter Three describes investigation of the type II IMDA reaction to give bicyclo[4.3.1]decene carbocyclic skeletons. A facile acid-catalysed 6,7-alkene to 7,8-alkene olefinic isomerisation, via a proposed oxonium intermediate, and the inability to appropriately functionalise the desired adducts impeded progress along the synthetic route. Molecular modelling was conducted to investigate the causes of this unexpected reactivity. Investigations in Chapter Four describe the successful synthesis and cyclisation of homomethyl triene analogues prepared via application of enyne metathesis chemistry. The use of an exo-cyclopropylcarbinyl fragmentation was found to be unsuccessful as a means of installing the desired 6-methyl-bicyclo[4.3.1]decan-2-one core with a competing endo-ring expansion giving rise to a bicyclo[4.4.1]undecane ring system. Chapter 5 summarises the above results and gives a brief discussion of the future potential of this research to provide for a total synthesis of the nakafuran and florlide natural products.
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Quintens, Hugo. "L’auto-inflammation dans le mécanisme de transition de régime de combustion de la déflagration vers la détonation." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2019. http://www.theses.fr/2019ESMA0014/document.
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Pour répondre aux défis environnementaux actuels, des solutions en rupture par rapport aux turbomachines existantes sont actuellement encours de développement. Elles s’appuient sur des cycles thermodynamiques plus efficients.L’objectif de ces travaux de thèse est d’étudier expérimentalement les mécanismes de transition de régime de combustion pour ce type d'applications en utilisant un surrogate de kérosène, le n-décane. Pour cela, une déflagration est initiée dans une enceinte fermée et comprime les gaz frais. La pression et la température de ces derniers augmentent jusqu’à atteindre les conditions propices à l’apparition de l’autoinflammation.3 régimes de combustion successifs sont caractérisés dans la chambre de combustion au moyen de diagnostics optiques rapides. Un premier dégagement de chaleur associé à la flamme froide pré-oxyde les gaz frais, il est suivi du dégagement de chaleur principal (Main Heat Release,MHR). Pour les températures initiales de mélange les plus élevées, une détonation est observée à la fin du processus. Deux chemins de transition différents sont mis en évidence : la transition Déflagration-Auto-inflammation (DAIT) et la transition Déflagration-Auto-inflammation-Détonation (DAIDT). La sensibilité des transitions de régime aux conditions initiales de pression, de température et de richesse a été caractérisée au moyen de plusieurs études paramétriques. Dans ce but, les conditions de température, de pression et de composition du mélange sont calculées aux instants d’apparition des différents fronts réactifs (flamme froide, MHR et détonation). Il a notamment été observé que les dégagements de chaleur successifs de l’auto-inflammation se déroulaient aux mêmes températures (740 K pour la flamme froide et 1050 K pour le MHR)quelles que soient les conditions initiales. L’étude s’est concentrée ensuite sur l’analyse d’un point de fonctionnement particulier. L’étude de ce point de fonctionnement, différents vitesses de front d’auto-inflammation ont été observées, mettant en évidence le mécanisme de SWACER lors de la transition.Un critère de transition de régime depuis l’auto-inflammation proposé de Zander et al., dans le cadre d’études numériques, a été testé dans notre configuration expérimentale. Un critère modifié a été développé en lui adjoignant la notion d’effets de compressibilité dans l’écoulement réactif. L’application de ce critère à l’ensemble des essais permet de prédire l’apparition de la détonation dans les conditions où 0 et 100 % de DAIDT sont observés. Les différents domaines de transition de régime ont également été positionnés sur le diagramme de Bradley (ξ, ϵ). Les modes de combustion prédits par le diagramme sont consistants avec ceux qui sont atteints dans la chambre.L’influence de la distribution initiale de température sur les modes de combustion atteignables dans la chambre a été étudiée. Trois topologies d’auto-inflammation ont été mises en évidence pour trois distributions de température dans la chambre. Ces topologies sont séparées en deux catégories, celles privilégiant une direction particulière lors de l’auto-inflammation séquentielle et celle présentant un comportement tridimensionnel.Les essais ayant un comportement tridimensionnel présentent une très forte propension à la DAIDT mais une propagation lente des fronts d’auto-inflammation. Dans ce cas, un autre mécanisme de transition vers la détonation est mis en évidence : l’auto-inflammation d’une poche homogène de gaz génère des ondes de choc et déclenchent des auto-inflammations successives pendant leur propagation. Le couplage choc/front réactif entraine la formation de la détonation.Différents mécanismes de transition vers la détonation ont été observés et étudiés sur une large plage de conditions de pression, température,richesse et gradient thermique. Les résultats obtenus permettront d’appuyer les études numériques réalisées sur le sujet, manquant jusque-là de données expérimentales en conditions académiquesTo meet the current environmental challenges, breakthrough solutions compared to existing turbomachines are currently under development.They rely on the use of more efficient thermodynamic cycles.The objective of this thesis is to study experimentally the mechanisms of transition of combustion regime using a kerosene surrogate, n-decane.For this purpose, a deflagration is initiated in a closed chamber and compresses the fresh gases. The pressure and the temperature of the endgas increase until reaching the conditions favorable to the appearance of the autoignition in the chamber.3 successive combustion regimes are characterized in the combustion chamber by means of fast optical diagnostics. A first heat release,associated with the cool flame phenomenon, pre-oxidizes the fresh gases, it is followed by the Main Heat Release (MHR). For the highest initial temperatures, a detonation is observed at the end of the process. Two different transition paths are highlighted: the Deflagration-Autoignition Transition (DAIT) and the Deflagration-Autoignition-Detonation Transition (DAIDT).The sensitivity of regime transitions to the initial conditions of pressure, temperature and mixture composition was characterized by means of several parametric studies. For this purpose, the conditions of temperature, pressure and composition of the mixture are calculated at the onset of the different reactive fronts (cool flame, MHR and detonation). In particular, it has been observed that the successive heat releases of theauto-ignition start at the same temperatures (740 K for the cool flame and 1050 K for the MHR) whatever the initial conditions. The study, then, focused on the analysis of a particular operating point. During the study of this operating point different self-ignition front velocities were observed, highlighting the mechanism of SWACER during the transition.A regime transition criterion proposed by Zander et al. based on numerical studies has been tested in our experimental setup. A modified criterion has been developed to take into account compressibility effects in the reactive flow. The application of this criterion to all the dataset makes possible to predict the appearance of the detonation under the conditions where 0 and 100% of DAIDT are observed. The different regime transition domains have also been positioned on the Bradley diagram (ξ, ε). The modes of combustion predicted by the diagram are consistent with those reached in the chamber.The influence of the initial temperature distribution on the combustion modes achievable in the chamber has been studied. Three topologies of autoignition have been demonstrated for three initial temperature distributions in the chamber. These topologies are separated into two categories, those favoring a particular direction during sequential self-ignition and that exhibiting a three-dimensional behavior.Three-dimensional tests show a very high propensity for DAIDT but a slow spread of autoignition fronts. In this case, another mechanism of transition to detonation is evidenced: the self-ignition of an homogeneous gas pocket generates shock waves and triggers successive autoinflammations during their propagation. The shock coupling / reactive front causes the formation of the detonation. Different transition mechanisms to detonation have been observed and studied over a wide range of pressure, temperature, equivalence ratio and thermal gradient conditions. The obtained results will be useful to support the numerical studies carried out on the subject, which lacks experimental data in academic conditions
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Bouaniche, Alexandre. "A hybrid stochastic-sectional method for the simulation of soot particle size distributions Vitiated high karlovitz n-decane/air turbulent flames: scaling laws and micro-mixing modeling analysis A hybrid stochastic/fixed-sectional method for solving the population balance equation." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR23.
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Les particules de suie (qui sont un type de particules ultrafines) peuvent être produites et émises dans des conditions de combustion riche. Les secteurs comme les transports (routier et aérien), où l'industrie sont des contributeurs significatifs aux émissions de particules. Celles-ci sont habituellement considérées comme des polluants dans la mesure où leur impact négatif sur la santé a été mesuré. Dans certains cas spécifiques comme la production de nanomatériaux, elles peuvent être synthétisées de manière volontaire. Dans les deux cas, une compréhension précise et une capabilité de prédiction de la distribution de tailles de particules (PSD en anglais) sont nécessaires, pour une meilleure conception des chambres de combustion. Dans cette thèse, une méthode innovante est proposée pour la prédiction de l'évolution de la distribution de tailles de particules (PSD). Elle consiste en une approche hybride composée de particules stochastiques représentant une fonction de densité de probabilité (PDF en anglais) et de sections fixes. L'objectif est de résoudre de manière précise le terme source de croissance/oxydation, en traitant le problème de diffusion numérique rencontré par des méthodes sectionnelles classiques. D'autre part, la méthode proposée est moins coûteuse qu'une méthode de Monte Carlo complète. D'abord, le contexte et les motivations de cette thèse sont expliqués. Les concepts et modèles pour les termes sources physiques de suie sont brièvement résumés. Ensuite, l'équation de bilan de population (PBE en anglais) qui pilote l'évolution de la distribution de tailles de particules (PSD), est présentée, ainsi que les différentes classes de méthodes utilisées pour sa résolution. La nouvelle méthode hybride est introduite. Sa précision et son efficacité sont démontrées sur des cas tests analytiques. Enfin, la méthode est appliquée sur une flamme prémélangée d'éthylèneSoot particles (which are one kind of ultra-fine particles) can be produced and emitted in fuel rich combustion conditions. Sectors like road and air transportation, or industry are significant contributors to soot particles emissions. Soot particles are usually considered as a pollutant as their negative impact on health has been assessed. In some specific cases like nanomaterials production, they can be synthesized on purpose. In both cases, accurate understanding and prediction capability of the Particle Size Distribution (PSD) is needed, for a better combustors design. In this thesis, a novel numerical method is proposed to predict the Particle Size Distribution (PSD) evolution. It consists in a hybrid approach featuring stochastic particles representing a Probability Density Function (PDF), and fixed sections. The objective is to solve accurately for the surface growth/oxidation term, mitigating the problem of numerical diffusion encountered in some classical sectional methods. On the other hand, the proposed method is less expensive than a full Monte Carlo method. First, the context and motivation of the thesis are explained. Concepts and models for soot physical source terms are shortly reviewed. Then, the Population Balance Equation (PBE), which drives the evolution of the Particle Size Distribution (PSD), is presented as well as the different classes of numerical methods used for its resolution. Subsequently, the novel hybrid method is introduced. Its accuracy and efficiency are demonstrated on analytical test cases. Finally, the method is applied on a premixed ethylene sooting flame
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Avendaño, Valdez Jorge. "Palabras del Decano." Pontificia Universidad Católica del Perú, 2015. http://repositorio.pucp.edu.pe/index/handle/123456789/115928.
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Cruchaga, Belaunde Miguel. "Encuentro con tu Decano." Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655787.
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Carboni, Mattia. "Consequence assessment for the accidental release of the aviation turbine fuel Jet A-1." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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In questo lavoro di tesi si è svolto in prima istanza uno studio preliminare atto a individuare una miscela rappresentativa del combustibile aeronautico Jet A-1, a partire dai limiti imposti dal mercato e dagli standard europei. Esso è stato identificato come miscela di n-decano e toluene in composizione relativa tale da avere proprietà chimiche e fisiche simili rispetto alla miscela reale.
Successivamente è stato individuato un set ridotto di cinetiche (reazioni) e di composti tale da rendere possibile l’implementazione in codici fluidodinamici computerizzati (CFD). Ciò è stato ottenuto utilizzando un'analisi di sensitività numerica e utilizzando il software Cantera.
Nella seconda fase del lavoro è stato utilizzato il software di simulazione dinamica di incendi denominato Fire Dynamic Simulator (FDS) sviluppato dal National Institute of Standards and Technology (NIST). Tale software è stato applicato per la simulazione degli incendi di pozza (pool fire) e per la simulazione della dispersione dei vapori del surrogato Jet A-1 su pista, seguito da un innesco ritardato (flash fire).
Nel caso del pool fire sono state valutate le temperature e i flussi termici radiativi in funzione del tempo e dello spazio. Nel caso della dispersione dei vapori del combustibile in atmosfera è stata invece valutata la frazione molare di combustibile presente nell’aria rispetto alla distanza dal punto sorgente, ed è stata valutata la dimensione della nuvola infiammabile avendo come riferimento il limite inferiore di infiammabilità della miscela in esame.
Il confronto con i dati sperimentali presenti in letteratura, in particolare per il pool fire - nei termini di flusso termico rispetto alla distanza dell’incendio - ha evidenziato una notevole discrepanza con i valori ottenuti dal modello di default di FDS, mentre ha invece confermato la bontà dei risultati ottenuti utilizzando il modello cinetico semplificato – ma di dettaglio - ottenuto in questo lavoro.
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Lee-Potter, Charlie. "Writing the 9/11 decade." Thesis, Royal Holloway, University of London, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590816.
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Novelists have struggled to find forms of expression that would allow them to register the post-9/11 landscape. This thesis examines their tentative and sometimes faltering attempts to establish a critical distance from and create a convincing narrative and metaphorical lexicon for the historical, political and psychological realities of the terrorist attacks. I suggest that they have, at times, been distracted by the populist rhetoric of journalistic expression, by a retreat to American exceptional ism and by the demand for an immediate response. The Bush administration's statement that the state and politicians 'create our own reality' served to reinforce the difficulties that novelists faced in creating their own. Against the background of public commentary post-9/11 , and the politics of the subsequent 'War on Terror', the thesis considers the work of Richard Ford, Paul Auster, Kamila Shamsie, Nadeem Aslam, Don DeLillo, Mohsin Hamid and Amy Waldman. USing my own extended interviews with Ford, Waldman and Shamsie, the artist Eric Fischl, the journalist Kevin Marsh, and with the former Archbishop of Canterbury Dr. Rowan Williams (who is also a 9/11 survivor), I consider the aims and praxis of novelists working wilhin a variety of traditions, from Ford's realism and Auster's metafiction to the postcolonial perspectives of Hamid and Aslam, and, finally, the end-of-decade reflections of Waldman. My conclusion is that novelists are, finally, edging closer to methodologies adequate to the challenges of the post-9/11 world. Ford's admission that writers do not 'have an exact human vocabulary for the loss of a city' has given way to a new surety that the narrative and visual arts can define the unimaginable in important and expressive ways.
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Wang, Alexander Ning-Yuan. "Air safety--the last decade." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42727.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (leaf 42).
by Alexander Ning-Yuan Wang.
M.Eng.
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Greenwood, Royston, Christine Oliver, Thomas B. Lawrence, and Renate Meyer. "Introduction: Into the Fourth Decade." SAGE, 2017. http://epub.wu.ac.at/6131/1/Meyer_etal_2017_SAGE_Introduction%2DInto%2Dthe%2Dfourth%2Ddecade.pdf.
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Hernández, Vilchez Luis Alfredo, Peña Ivon América Saenz, Tasillo Patricia Janet Tejada, and Fernández Stefano Guillermo Vásquez. "DeCasa." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653329.
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DeCasa es una empresa de servicios de mantenimiento en el hogar que brinda soluciones referentes a servicios de limpieza, gasfitería, pintura, cerrajería y decoración de interiores para usuarios de Lima Metropolitana.
Dentro de las investigaciones realizadas por nuestro equipo de trabajo, encontramos información relevante que nos sustenta la importancia y necesidad de la sociedad por encontrar soluciones a problemas técnicos en el hogar a través de un aplicativo móvil formal; sin embargo, aún existe una alta dependencia por la demanda de técnicos que trabajan de manera informal. Asimismo, existe desconfianza por parte de los usuarios para contratar un técnico, ya que no se conoce cuál es el precio adecuado para cada servicio. Por esta razón, hemos diseñado una plataforma digital amigable y confiable que brindará soluciones a problemas domésticos en diferentes áreas, bajo el nombre de DeCasa. Esta aplicación móvil estará disponible para clientes con dispositivos móviles conectados a internet, quienes podrán descargar la aplicación y registrarse para solicitar o programar sus servicios. Al mismo tiempo, los técnicos estarán disponibles para solucionar los requerimientos de los usuarios a tiempo.
Dentro de nuestra aplicación los clientes encontrarán referencias y comentarios de otros usuarios para elegir al técnico de su preferencia; es decir, podrán visualizar el historial de calificaciones para conocer los trabajos realizados por el técnico. Asimismo, podrán encontrar información de precios sobre nuestros servicios; en ese sentido, nuestros clientes podrán tomar una decisión previa para la elección de nuestros especialistas.DeCasa is a home maintenance services company in Lima. We are specialists in cleaning services, plumbing, painting, locksmithing and interior desing. Following the research by our team, we have found important information that show us that society requires and need to find solutions to their technical problems at home through a mobile application (app). Even though, we know that people have high demands for the informal work, our interviews has shown that the population needs, an innovation solution for problems at home domestic service. In that context, customers don't trust to employ a specialist because they don't know which is the correct price for each service. By our research, we have developed a digital, friendly and trustable platform that will provide solutions to domestic problems in different areas. Our app will be available for users who have mobile devices connected to the internet, they will download the App and register for request our service. They will could schedule the specialist service that will be available to approach in time to solve a technical problem, also knowing the price before the specialist arrive. Finally, inside of our app, the customers will find the score of our specialist, recommendation of other customers and rate service.
Trabajo de investigación
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Randle-Conde, Aidan. "Measurements of B(Ds -> lvl) and fDs using data collected from the BaBar experiment." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/6325.
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This thesis presents measurements of the branching fractions B(Ds -> lvl) and mea- surements of the pseudoscalar decay constant, fDs , using all the data acquired at the BaBar detector at SLAC National Accelerator Laboratory, which were collected from September 1999 to April 2007, and comprised 531 fb-1. The following mea- surements are made: B(Ds -> eve) = (6:11 +/-0:38 +/- 0:33) * 10-3, B(Ds -> tvt) = (5:06 +/- 0:34 +/- 0:50) * 10-2 , and a limit B(Ds -> eve) < 1:46 * 10-4 is obtained. Using these measurements a value of fDs = 252 +/- 6 +/- 7 +/- 1MeV is obtained, where the first uncertainties account for the statistical limitations of the data, the second uncertainties account for the systematic uncertainties, and the third uncertainties account for uncertainties associated with other physical constants (dominated by the lifetime of the Ds meson).
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TANG, Shuk On Fiona. "Japan : regime change in the "lost decade"." Digital Commons @ Lingnan University, 2005. https://commons.ln.edu.hk/pol_etd/7.
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The shift in both the political and economic situations of Japan in the post- 1993s caught the attention of observers because the abrupt changes were unparalleled in other Organization for Economic Cooperation and Development (OECD) countries. Politically, a single conservative party had dominated Japan’s electoral and government spheres in a way unmatched in any other industrialized democracy two-to-one majorities over the next largest party; complete control of all cabinet posts; and a relatively large influence of government over the economy. Economically too, Japan’s rapid growth had also been without parallel and had put it at the head of the countries called the “Asian dragons”. The national growth rates of Japan were also double those of other OECD countries in the postwar period; labour productivity in manufacturing and industry was far greater; unemployment and inflation were dramatically lower; saving rates of people remained consistently higher; and overseas investments and holdings exploded more dramatically. All these successes had shocked the rest of the world.
However, the loss of the dominance by the LDP and the end of the high growth of Japan's economy in the early 1990s contributed to what many Japanese have come to call the 'lost decade' and resulted in serious debates over the political and economic direction of Japan.
This thesis uses a qualitative research methodology. A theoretical model of regime change will be used to analyze the political and economic shift of Japan.
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Hartranft, Linda Bussard. "The ninth decade : six central Ohio women /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487778663285454.
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Morrison, Kenneth E. "Wordsworth's Decline: Self-editing and Editing the Self." TopSCHOLAR®, 2010. http://digitalcommons.wku.edu/theses/220.
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In critical discourse surrounding the poetry of William Wordsworth, it has become generally acceptable to describe the course of the poet’s career by means of a theory of “decline.” In its most common form, this theory argues that Wordsworth’s best poetry was written during one “Great Decade” (1798-1807)—an isolated epoch of prolificacy and genius. His subsequent works, it is argued, neither surpass nor equal his initial efforts; the course of his career after 1808 may be best described in terms of declivity, ebb, and decline.
Due to its ideological complicity with the very texts it engages, and due to its construction as a “myth” of criticism, the theory of decline ultimately becomes a reductive premise that precludes understanding Wordsworth’s apparent downtrend as a complex but explicable process. This study therefore seeks to provide a critical explanation for the process of decline so often observed in Wordsworth’s poetry. In essence, I contend that the perceptible downtrend in Wordsworth’s verse is the direct consequence of continuous, career-long processes of revision or self-editing. This self-editing took two forms: First, the explicit form, whereby Wordsworth actually emended his poetry; and second, the implicit form, whereby Wordsworth sought, through his poetry, to amend his self-image by constructing an autobiography tailored to fit an idealized poetic identity.
This analysis thus reveals and explicates Wordsworth’s possible motives for revision—the fluctuating demands made upon the poet by the poet himself. Because these demands represent the operative (if unstable) principle underlying specific textual changes, one may infer from their character the reasons why Wordsworth’s later poetry suffers in revision. By attending to the process whereby earlier verse was continually revised in order to fit a conceptual or poetic context for which it was not originally intended, I demonstrate how the actual substance of Wordsworth’s poetry was compromised or attenuated through a reductive (re)appropriation of its own materials.
Unlike many critics, I do not treat Wordsworth’s revisions as the signifiers of some external change. Instead, my approach keys upon the conflict between Wordsworth’s efforts to realize a stable poetic identity and the representational and rhetorical limitations of poetic form, particularly with regards to autobiography. Drawing on the work of Susan Wolfson, Paul de Man, and Harold Bloom, I argue that Wordsworth’s revisionary practices are motivated by an agonistic process best described as “autobiographical anxiety” or the “‘anxiety of influence’ turned inward.” Ultimately, I conclude that Wordsworth’s decline was the consequence of an overarching ethic of composition which, because it privileged revision as a means of changing not only poetry but the poet himself, allowed self-consciousness to become a self-defeating agent.
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Imbeau, Dominique. "Attitudes des m??decins de famille et des r??sidents en m??decine familiale ?? l'??gard des personnes pr??sentant un trouble de personnalit?? limite." Thèse, Universit?? de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/125.
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Cette th??se pr??sente, dans le premier article, les r??sultats de la validation pr??liminaire d???un outil permettant de d??crire et mesurer les attitudes des professionnels de la sant?? qui interviennent aupr??s de personnes pr??sentant un trouble de personnalit?? limite (TPL). Cet outil a ??t?? d??velopp?? au Qu??bec. Il s???agit de l?????chelle d???attitudes ?? l?????gard des personnes pr??sentant un TPL (??A-TPL; Bouchard, 2001). Le deuxi??me article s???est int??ress?? aux attitudes des m??decins de famille et des r??sidents en m??decine familiale. Les attitudes des m??decins ont ??t?? mesur??es ?? l???aide de l?????A-TPL (Bouchard, 2001) et compar??es ?? celles pr??sent??es par d???autres professionnels de la sant?? mentale.
En guise d???introduction ?? ces articles, la probl??matique des personnes pr??sentant un TPL est d???abord d??crite. Ensuite, les r??sultats de recherche portant sur les attitudes g??n??ralement entretenues par les intervenants qui travaillent aupr??s de cette client??le et l???impact de ces attitudes sur la qualit?? des soins prodigu??s aux personnes ayant un TPL sont pr??sent??s. ??galement, les difficult??s rencontr??es par les m??decins de famille dans la prise en charge de cette client??le sont soulign??es.
Les deux articles sont ensuite pr??sent??s. Les r??sultats de la premi??re ??tude d??montrent que l?????A-TPL constitue un outil valide et int??ressant pour mesurer les attitudes des professionnels de la sant?? envers les personnes pr??sentant un TPL. Les r??sultats de la seconde ??tude indiquent que les m??decins de famille pr??sentent en moyenne le m??me niveau d???endossement d???attitudes ?? l???endroit des personnes pr??sentant un TPL que les autres professionnels de la sant?? mentale.
La discussion permettra d?????laborer sur l???impact des attitudes n??gatives envers les personnes pr??sentant un TPL sur le d??veloppement de l???alliance th??rapeutique, la contribution positive d???une bonne alliance th??rapeutique sur les r??sultats des soins, et l???accent mis sur l???enseignement des habilet??s communicationnelles chez les m??decins afin de cr??er une meilleure relation avec leurs patients. L???importance d???offrir une formation plus ??toff??e et sp??cifique portant sur les troubles de la personnalit?? est ensuite soulign??e, ceci afin de permettre d???am??liorer la compr??hension de ce trouble, influencer positivement les attitudes des intervenants, permettre le d??veloppement d???une meilleure alliance de travail avec cette client??le et, ultimement, d???am??liorer la qualit?? des soins qui leur sont prodigu??s. En conclusion, l???auteure insiste sur l???importance de mieux outiller les m??decins de famille qui constituent le plus souvent la principale porte d???entr??e vers les services de sant?? pour cette client??le qui consulte fr??quemment pour de multiples probl??mes de sant?? physique.
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Brown, Donald. "A decade of Word and witness in Ohio." Theological Research Exchange Network (TREN), 1988. http://www.tren.com.
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McFadden, Majella. "Female sexuality in the second decade of AIDS." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282254.
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Pack, Robert P. "Lessons Learned a Decade into the Opioid Epidemic." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/1338.
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Dunning, D. L. "A decade of Irish literary periodicals, 1904-1914." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3009326/.
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This thesis examines the history and development of three Irish periodicals, published between 1904-1914, with emphasis placed upon the literary magazine as a distinct genre and the impact of this genre on the literary and cultural landscape of Ireland at a crucial time in its nascent development. My research considers the manner in which each magazine was established and run, with an emphasis on varying editorial personalities and their impact upon each periodical. Each chapter is dedicated to an individual magazine and is structured in chronological order, with the first focused upon Dana, the second dedicated to Uladh (both published from 1904-1905) and the final chapter focused upon The Irish Review (1911-1914). The aim is to provide an assessment of those journals, acknowledging how key figures of the period made use of their pages to promote their own views and the movements that they supported. This thesis will emphasise the significance of the literary magazine as a historical resource that reveals much about the period in which it was published. Until now the history of these literary periodicals has remained largely untold, as have the events surrounding the lives of their editors and contributors during their publication years. My primary purpose is to tell these stories in the detail they deserve.
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Dixon, Claire. "Printed Matter, Inc., The First Decade: 1976-1986." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/160.
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This thesis provides an account of the events of the first ten years of Printed Matter, Inc., a distribution center for artists’ books established in New York City in 1976. Included are descriptions of the individuals who formed Printed Matter’s first board, their objectives, books published by Printed Matter, and the windows installation program. This thesis also describes challenges the board members faced, including lack of organization, difficulty cultivating a broad public audience, and inadequate income. In addition, it recounts the gradual streamlining of business practices, and the realignment of goals and expectations for the genre as board members accepted the fact of a limited audience for artists’ books. The conclusion offers a brief summary and a look at Printed Matter, Inc.’s current operations.
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Baker, Sylvia. "Perestroika: : Economic Growth and the USSR’s Final Decade." Thesis, Uppsala universitet, Ekonomisk-historiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324794.
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One of the great superpowers in recent history experienced a tumultuous final decade, shining a light on several important policies of economic reform known as perestroika, championed by General Secretary of the USSR Mikhail Sergeyevich Gorbachev. According to, for instance, Stuart and Gregory, the reforms aimed at renewing making the Soviet economy more efficient. In this essay, the impact of the reform on the economy is subject of analysis.The subject is approached the topic via literature research on the topic of 1980s USSR economic problems, combined with key aggregate data on economic conditions (i.e. grain yield production, GDP per capita pre- and post-perestroika, foreign trade, life expectant pre-and post-perestroika). The thesis concluded that perestroika was unable to salvage the USSR, in fact, conditions only worsened after its administration, following into the 1990s.
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Kling, Felix, and Felix Kling. "Exotic Higgs Decays." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620861.
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Many models of physics beyond the Standard Model include an extended Higgs sector, responsible for electroweak symmetry breaking, and predict the existence of additional Higgs bosons. The Type II Two-Higgs-Doublet Model (2HDM) is a particularly well motivated scenario and a suitable framework for phenomenological studies of extended Higgs sectors. Its low energy spectrum includes two CP-even Higgses h and H, one CP-odd Higgs A, and a pair of charged Higgses H±. We study the implication of the LHC Higgs search results on the Type II 2HDM and identify regions of parameter space which are consistent with all experimental and theoretical constraints and can accommodate the observed 125 GeV Higgs signal. This includes parameter space with a distinctive mass hierarchy which permit a sizable mass splitting between the undiscovered non-Standard Model Higgs states. If this mass splitting is large enough, exotic Higgs decay channels into either a Higgs plus a Standard Model gauge boson or two lighter Higgses open up. This can significantly weaken the reach of the conventional Higgs decay channels into Standard Model particles but also provide the additional opportunity to search for exotic Higgs decay channels. We provide benchmark planes to explore exotic Higgs decay scenarios and perform detailed collider analyses to study the exotic decay channels H/A -> AZ/HZ and H± -> AW/HW. We find that these exotic decays offer complementary discovery channels to the conventional modes for both neutral and charged Higgs searches and permit exclusion and discovery in large regions of parameter space.
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Cathro, Rebecca Ann. "New Zealand's women working free? : a decade of change." Thesis, University of Canterbury. Department of Political Science, 2001. http://hdl.handle.net/10092/4311.
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This thesis examines the effects and impacts of the Employment Contracts Act 1991 on
women in non-standard from 1991-1999 in New Zealand. It addresses the need for
qualitative research that gives voice to the experiences of women in non-standard work.
The research model developed in this thesis is informed by feminist methodology. It is
argued that the traditional methods of recording employment statistics and of
conducting survey interviews do not account for the personal experiences of the
respondents. This study combines three techniques: analysis of published literature,
analysis of employment statistics and in-depth qualitative interviews with six women in
non-standard employment.
Examination of the political context of the enactment of the Employment Contracts Act
1991 highlighted varied expectations of the legislation. Political parties, feminist
researchers and interest groups differed in their assessment of the implications of the
Act for women in non-standard work. The study compares these views with statistical
data and the findings of interviews with women in non-standard work.
It is argued that the Act has had a significant effect on women. The flexibility of
employment created by the Act has enabled women with young children to work by
lifting the constraints on time, as well as the responsibilities of child-care. However,
flexible working hours imposed significant constraints on women's private time and the
results of the interviews suggest that the affects of the Act are different for women who
no longer require flexibility in work in order to work around child-care responsibilities.
In conclusion, this discussion gives a new perspective to the study of the effects of the
Employment Contracts Act 1991 by supplementing analysis of political debate and statistical records with opportunities for ordinary women workers to reflect on their
experiences. This indicative study provides a basis for further research in this area.
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Drukier, Wendy (Wendy Ellen) Carleton University Dissertation International Affairs. "Understanding mobilization: urban popular movements and Mexico's lost decade." Ottawa, 1995.
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Dougnac, Quintana Paulette. "Los derechos humanos bajo la lupa de "El Decano"." Tesis, Universidad de Chile, 2007. http://repositorio.uchile.cl/handle/2250/145175.
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Memoria para optar al título de periodistaEsta investigación fue desarrollada en el marco del proyecto “El Diario de Agustín. El Mercurio y las violaciones a los Derechos Humanos”, de la Escuela de Periodismo de la Universidad de Chile. Y forma parte de un documental de Ignacio Agüero y del periodista Fernando Villagrán. Durante todo el año 2006 un grupo de seis memoristas trabajó en un taller a partir del cual cada uno de ellos hizo su propia investigación. El proceso fue registrado por las cámaras del documental.
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Channing, Jill. "Challenges and Opportunities: Community Colleges in the Coming Decade." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/4877.
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In a time of great social and political change, what are the major challenges and opportunities that community colleges and their leaders will face in the coming decade? How can leaders lead through changes involving enrollment, shifts in populations, new funding models, new student success definitions, and accountability measures?
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Abdullahi, Leila Hussein. "Adolescent immunisation in Africa in the decade of vaccines." Doctoral thesis, Faculty of Health Sciences, 2019. http://hdl.handle.net/11427/30364.
Full textAbstract:
Rationale: There are many public health benefits of targeting adolescent for immunisation. However, and in many settings, adolescents do not get optimal benefits from immunisation. In the decade of vaccines (2011-2020), adolescent immunisation is a topical subject. An up-to-date and synthesized research on adolescent immunisation is lacking. Overall purpose: The purpose of the PhD thesis was to characterize adolescent immunisation in the decade of vaccines. Research methods: First, we conducted a comprehensive narrative review of the literature (chapter 2) on adolescent immunisation. Then, we conducted systematic reviews (chapters 3 and 4). One of the systematic reviews assessed the strategies to improve uptake of vaccines among adolescents. The other systematic review assessed the knowledge, attitudes and practices of adolescents and their parents and teachers towards immunisation. Finally (chapter 5), we conducted a cross-sectional study to describe the challenges experienced, and lessons learnt during the introduction of national human papillomavirus (HPV) vaccination programmes in Africa. Findings: Adolescents are an important group to target with primary, booster or catch up immunisation. Some global initiatives have advocated for adolescent immunisation. Multiple reasons, among them, lack of knowledge and access to immunisation services are barriers to adolescent immunisation. There exist multiple strategies to improve uptake of vaccines among adolescents. For example, health education, financial incentives, mandatory vaccination, and class-based school vaccine delivery. The evidence suggests that a combination of strategies may be more effective than one strategy alone in enhancing uptake of vaccines by adolescents. Knowledge of vaccines, immunisation and vaccine preventable diseases was found to be suboptimal among key stakeholders of adolescent immunisation in Africa. We found a disconnect between the level of knowledge on immunisation and the uptake of vaccines, an interesting finding that warrants further research in Africa. Six African countries shared the lessons learnt and experiences during the national introduction of HPV vaccination programmes that targeted adolescent girls. There were similarities in the results among the participating countries. The challenges included: logistical coordination, identification of the target population, obtaining political support, integration with other school programmes and stakeholder engagement. A lesson learnt was that schools are a convenient site to access and vaccinate adolescents. Conclusion: Adolescent immunisation is not routinely practiced in many countries. The introduction of HPV vaccines has created an ideal opportunity to build platforms for adolescent immunisation. Research on adolescent immunisation is limited, more so in low and middle-income countries. Existing research shows a combination of strategies can be used to enhance uptake of vaccines among adolescents. Strong advocacy programmes are required to drive the global agenda of adolescent immunisation, particularly in Africa.
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Meredith, Ivan. "Opera in South Africa during the first democratic decade." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/26771.
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The author set out to investigate operatic works that were written in South Africa between 1994 and 2004. Original works that included African elements were of interest as was their classification as operas, musical theatre or music drama. Their artistic merit and the process followed in writing successful works in this genre were investigated. Not only was the collaboration between composer and librettist scrutinised, but also the initial stage during which the conception for these theatrical works took shape. Due to the empirical nature of the research, data was collected mostly via interviews held with composers, librettists, directors and conductors of original works written and performed in the said period. The data is presented in six chapters, each one providing a full description of casting details, synopses and brief analyses of the works. In the Preface the premise upon which the research rests is discussed, while the Introduction serves to highlight various issues concerning modem opera and fusion works that have played an important role in providing the groundwork for contemporary ethnic opera in this country. Original works are discussed in each chapter, and a critical evaluation is presented in an Appendix. The author concludes that much effort was expended by pioneers in the fields of music, theatre and dance to create new works and organise performances. What emerged, furthermore, was that many of the works analysed could not be categorised as 'opera' but rather as 'musical theatre' or 'music drama'. It would also seem that uninitiated audiences first need to be made conscious of the aesthetic value of the genre before they may be able to appreciate it. Operatic production companies have always been at the forefront when it comes to decision - making regarding which and whose work shall be performed. Funding is crucial to the success of any production and plays an equally important role in eventually determining a positive outcome. This aspect has, therefore, also been included as part of the research project.
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Parrish, Jordan G. "The Undead Subject of Lost Decade Japanese Horror Cinema." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502193416130062.
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Hamilton, John E., and n/a. "The curriculum consultancy section, ACT Schools Authority : the first decade." University of Canberra. Education, 1985. http://erl.canberra.edu.au./public/adt-AUC20060714.154658.
Full textAbstract:
The study presents a review of the establishment and operation of the
Curriculum Consultancy Section of the ACT Schools Authority over the
period of the first decade of its existence.
It considers the move to establish a new and different education
system; the important reports which gave impetus to that move; first
the Currie Report (1967.), Report on an Independent Education
Authority for the Australian Capital Territory and the three further
reports which kept the spirit of the Currie Report alive, i.e. the
Neal-Radford Report (1972.), the Campbell Report (1973.), and the
Hughes Report (1973.). The study emphasises the haste with which the
new system was finally established; that there was not time to develop
a 'coherent, imaginative and suitable plan' (Currie, 1967, p.9.) and
that staff resources were inadequate. As Beare (1978.) has noted, 'At
no time in its first four years was the Schools Office given the
manpower needed merely for maintenance functions let alone for
development activities ... .' (p.80.)
The curriculum issues that arose in planning this new system and the
curriculum context within Australia are considered prior to a close
examination of the development and operation of the section during the
decade; the pressures which affected it and the changes which occurred
This examination as the main body of the study falls easily into three
periods; The First Years; The Middle Years of the First Decade; and
the Final Years of the First Decade; each period coinciding with the
period of tenure of one of the three principals the section has had in
those ten years. Throughout this main body of the study the major
recurring themes affecting the life of the section are closely
followed, i.e. the conflict within the system, the diversity of
demands and the difficulties of meeting those demands, the difficulty
of defining role and function and the problems of leadership.
In conclusion the study reflects on these recurring themes and
examines the changes which have occurred over the decade, e.g. the
changes in role and function, the shift in orientation to consultancy,
the changes in selection and professional development of consultants,
the concentration of consultants in priority areas and the developing
cohesiveness of the consultancy section. Finally the study addresses
the future; consideration is given to the stage in the life cycle of
an organisation that the ACT Schools Authority is at currently and to
the effect that this may possibly have upon the undoubtedly troubled
future of the Curriculum Consultancy Section.
The study draws on the documents available; on interviews with people
who have worked in the area and also on the extensive body of
literature which is available.
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Giger, Peter. "Conversation and Figuration from the Horizontality of the 2.0 Decade." Doctoral thesis, Blekinge Tekniska Högskola [bth.se], School of Planning and Media Design, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00479.
Full textAbstract:
This thesis concerns the 2.0 decade, the decade when the social web started to develop. The main research objective is to contribute to our embedment in Internet technology in a conscious and livable way. The thesis is part of a general attempt to improve our understanding of the transformation taking place in the development of the web. We live in a time when knowledge contexts are moving from expert knowledge towards conversational knowledge. My research is mainly presented in the form of five essays. This thesis can be described as a conversational analysis of knowledge processes during the 2.0 decade. The 2.0 decade came to life in the wake of the information technology bubble in the end of the 1990s. The first decade of the 2000s was the decade when 'the Web' became 'Web 2.0' and the energy of the Internet switched from monetary speculations to conversations. Everyone wanted to start conversations and build digital technology, which induced conversations. Like the concept Web 2.0, this thesis came to life in the wake of the information technology bubble. It presupposes the knowledge relation between humans and our technology to be conversational rather than rational. This basically means that digital technology is not a tool but an integrated part in the person assemblage. There are many important thinkers embedded in this thesis. Some of them are more important than others, notably Gilles Deleuze and Donna Haraway. However, the thesis does not analyze the text of other thinkers, it involves them in the conversation. Important concepts as assemblage, rhizome (Deleuze) and cyborg (Haraway) are participants in the text rather than being its objectives. They are part of the general experience behind the essays, together with all the persons I have linked up to and the digital technology I have tried to become with. To become with (or develop together with) technology means to acknowledge the idea that technology is more than a tool. It is something within, not something external.
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Mphahlele, Rennie Esther. "A decade of educational change grounded narratives of school principals /." Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-02232009-085412.
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Roush, Edward W. (Edward Wesley). "The Emergence of Christian Television: the First Decade, 1949-1959." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc504286/.
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The purpose of this research was to describe the relationship and to compare the programming of major Christian ministries during the first decade of Christian television. A historical perspective was the method used in identifying and explaining the events and activities that constituted Christian television from 1949 to 1959. The results of the research concluded that Christian television began at a time of social trauma, unrest, and confusion in America. Competition for a viewing audience was not a factor. Leading personalities presented themselves as independent thinkers who also saw themselves as "preachers" with a strong desire to succeed. Motivation was provided by a sense of "dominion" that emerged from the Great Awakenings within the churches of America that became a driving force in the first three decades of this century.
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Hampe, Martínez Teodoro. "Hugo Piaggio Bertora, Decano y maestro de derecho (1909 - 1997)." THĒMIS-Revista de Derecho, 2015. http://repositorio.pucp.edu.pe/index/handle/123456789/108400.
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Neves, Mujica Javier. "Memoria de la gestión del decano, julio 2005-junio 2008." Pontificia Universidad Católica del Perú, 2008. http://repositorio.pucp.edu.pe/index/handle/123456789/116202.
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