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1
Engdahl, Daniel. "Development of a Test Platform for the Automation System DeltaV." Thesis, KTH, Reglerteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-106254.
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This report describes the development of a test platform and a self study course for the process automation system DeltaV. Sandvik started using this process automation system in 2004. In order to educate personnel in the system without having to disrupt any production lines an educational test platform was needed. The test platform that was developed in this project made use of the same production instruments as the actual production process. The test platform consisted of a physical process automated with a control database developed with DeltaV control software. One important aspect to the development was that the platform was designed to be portable. This is still a part that could be improved.
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Van, Beusekom Craig Joseph. "A new guidance method for a DeltaV and re-entry constrained orbit transfer problem." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/46571.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.<br>Includes bibliographical references (p. 153-154).<br>This thesis proposes a spacecraft guidance system designed for a unique class of orbit transfer problems. It considers a vehicle that undertakes a maneuver with the objective of precisely flying through a point in space at a particular time. The spacecraft must automatically determine a transfer orbit that will take it from a circular, low-earth parking orbit to a velocity-unconstrained rendezvous with a Keplerian trajectory. A constraint exists that both the final transfer orbit and the ultimate paths of any additional stages must lead rapidly to atmospheric reentry, typically within one revolution. Constrained to a fixed [delta]V resulting from a two stage thrust profile, the spacecraft must execute a burn maneuver that can effectively dissipate energy to place it on a transfer orbit with previously unknown velocity requirements. Finally, the guidance strategy should be robust to the uncertainties typically encountered in real spacecraft orbit transfer problems. In order to meet these constraints, this thesis first develops new analytic analysis of the relationship between reentry, perigee, and [delta]V. Next, a framework is developed for selecting a favorable transfer orbit while considering the various hard and soft constraints in the problem. Following transfer orbit selection, a plane of maneuver is calculated that maximizes likelihood of first stage reentry. Then traditional guidance strategies are adapted to the problem and hypothetical spacecraft design to produce a closed loop guidance solution. Results are presented that demonstrate the effectiveness of the new method.<br>by Craig Joseph Van Beusekom.<br>S.M.
3
Johnson, Jonas. "The Cardiac State Diagram : A new method for assessing cardiac mechanics." Doctoral thesis, KTH, Medicinsk avbildning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202743.
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Besset, Manon. "Morphodynamique récente, évolution et vulnérabilité des littoraux deltaïques : une analyse globale." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0326/document.
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Les deltas fluviaux sont des écosystèmes riches et vulnérables. Les apports de sédiments fluviaux assurent leur développement face à la subsidence et l’érosion induite par les agents marins. Les deltas sont principalement exposés à des crues et des submersions marines. Pourtant, ils restent des lieux stratégiques de peuplement, de production économique et d’enjeux géopolitiques, les rendant d’autant plus vulnérables et exposés aux risques. Cette thèse a pour objectif de cerner le fonctionnement passé et actuel de ces systèmes à partir de l’analyse de soixante deltas et d’une approche holistique systémique, à l’aide de données spatiales, environnementales et sociétales. Après l’étude de l’évolution côtière récente montrant une tendance à la diminution de la progradation de nombreux deltas, une classification conceptuelle et qualitative de la morphologie des deltas axée sur les influences fluviomarines a été conduite. La mise à jour de cette classification et la proposition de nouvelles approches, en termes de morphologie, de dynamique et de vulnérabilité, ont nécessité une revue des acquis antérieurs, une quantification de l’influence du fleuve, de la houle et de la marée, et une approche quantitative qui a mis en évidence la complexité des interactions. Le travail débouche sur une nouvelle classification quantitative et objective. La thèse compare aussi les réponses deltaïques à des perturbations exceptionnelles, montrant les limites de la résilience deltaïque. Elle renseigne sur l'impact anthropique sur ces espaces fragiles fortement dépendants de l’apport sédimentaire. Cet équilibre est d’autant plus fragilisé aujourd’hui par les impacts du changement climatique<br>River deltas are rich and fragile ecosystems. Deltas depend on fluvial sediment supply to balance natural subsidence and erosion caused by waves and currents. Deltas are mainly affected by river flooding, marine submersion. However, deltas are strategic sites of human settlement, economic hotspots, and geopolitical issues. This attraction increases the pressure, rendering these deltas more and more exposed to risks and vulnerable.The main objective of this thesis is to analyze the past and present functional dynamics of delta shorelines based on 60 of the world’s deltas and a holistic and systemic approach with spatial, environmental, and societal data. After the study of recent coastal evolution showing a tendency to decreasing progradation of many deltas, a conceptual and qualitative classification of deltaic morphology based on fluviomarine influences was conducted. Updating of this classification and the proposal of new approaches, in terms of morphology, dynamics, and vulnerability, have necessitated revisiting these older schemes, and the adoption of a methodological and interpretative approach aimed at quantification of the weight of each of these three parameters showing the complexity of the interactions. The thesis proposes a new quantitative and objective classificatory framework, including the human dimension. Finally, the thesis highlights the responses of deltaic shorelines to exceptional perturbations, and highlights the limits of resilience. The thesis advises over the impact of humans on these fragile coastal environments, the equilibrium of which strongly depends on sediment supply. This fragility is further exacerbated by the impacts of climate change
5
Ozturk, H. E. "Role of Notch ligands DeltaC and DeltaD during zebrafish development : a transgenic approach." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/16136/.
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The Notch signalling pathway appears to be ubiquitous in metazoan animals, and is one of the most thoroughly studied signalling pathways. Notchmediated cell-cell communication is crucial for development: it governs the establishment of patterns of gene expression and differentiation and regulates binary cell fate choices and the maintenance of stem cell populations. In zebrafish, Notch signalling governs many aspects of embryonic and adult development and recent studies have identified the main players in different contexts. Interestingly, however, as we learn more about Notch signalling, we are starting to realize the complexity of this pathway that is put together in a relatively simple way. One source of complexity comes from the diversity of roles and functions of different Notch ligands. Among those, we are particularly interested in DeltaC and DeltaD, two major members of the Delta family of ligands, which are curiously expressed together in various contexts ranging from neurogenesis to formation of the gut epithelium and somitogenesis. Many questions remain as to the exact functions of the Notch ligands DeltaC and DeltaD in the somite segmentation process and elsewhere. To investigate temporal and other aspects of the role of these Notch ligands, I have created transgenic zebrafish lines in which we can provoke expression of either one with a heat shock, using either direct regulation by a heat-shock promoter or via GAL4-VP16. This thesis describes the work done during the creation, establishment and validation of these transgenic lines and discusses some of the applications that can reveal novel aspects of Notch signalling, focusing on somite segmentation. I believe that by using these transgenic fish lines, in coordination with other lines that we currently have, we will be able to answer important questions relevant to not only somite segmentation, but also Notch signalling in general.
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Yocum, Tara A. "Growth laws for sub-delta crevasses in the Mississippi River Delta: observations and modeling." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2339.
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In this study we assessed growth laws of sub-delta crevasses in the Mississippi River delta plain, experimental laboratory deltas, and compared them to previously studied river dominated large deltas worldwide. Metrics for channel and delta geometry for each system were obtained using a combination of geospatial tools, bathymetric datasets, sediment size, and hydrodynamic observations. Most crevasses and experimental deltas appear to obey delta growth laws suggesting that they exhibit planform metrics similar to larger deltas. However, some channels within each system, exhibit outlier behavior (e.g. asymmetric growth) where channel length is much larger than channel width. Hydrodynamic observations and morphodynamic modeling results, support the role of confinement in governing this response, through direct lateral confinement of the receiving basin width and depth thus guiding channels, and indirect confinement caused by sediment cohesion, whereby natural levees guide the systems asymmetric channel growth.
7
Borg, Denis. "Implementação de uma rede neural em ambiente foundation fieldbus para computação de vazão simulando um instrumento multivariável." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-29072011-100528/.
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Esta dissertação propõe o desenvolvimento de uma rede neural artificial (RNA) direcionada a ambientes foundation fieldbus para realização do cálculo de vazão em dutos fechados. Para tanto, a metodologia proposta utiliza-se de medidas de pressão, temperatura e pressão diferencial, as quais normalmente estão disponíveis em plantas industriais. A principal motivação do emprego das redes neurais reside no seu baixo custo e simplicidade de implementação, o que possibilita o emprego de apenas blocos fieldbus padrões tornando a metodologia independente do fabricante. Foi utilizada uma rede perceptron multicamadas com algoritmo de treinamento backpropagation de Levenberg-Marquardt. O treinamento foi realizado numa programação elaborada para o software Matlab TM. A arquitetura da rede neural foi determinada por métodos empíricos variando-se o número de neurônios e de camadas neurais até se atingir um erro aceitável na prática. Após esses treinamentos foi desenvolvida uma programação para realizar os cálculos de vazão em um ambiente foundation fieldbus utilizando-se para tanto o software DeltaV TM do fabricante Emerson Process Management. Foram obtidos resultados com erro relativo médio de valor de vazão em torno de 1.43% para um primeiro cenário utilizando uma placa de orifício e ar como fluido, e de 0,073% para um segundo cenário utilizando uma placa de orifício e gás natural como fluido, com relação aos valores obtidos através do instrumento multivariável 3095MV TM do fabricante Rosemount. Os valores de erro encontrados validam o método desenvolvido nessa dissertação.<br>This dissertation proposes the development of an artificial neural network (ANN) directed to foundation fieldbus environment for calculation of flow in closed ducts. The proposed methodology uses measurements of pressure, temperature and differential pressure, which are usually available in industrial plants. The main motivation of the use of neural networks lies in their low cost and simplicity of implementation, which allows the use of standard fieldbus blocks by just making the method independent of the manufacturer. It was used a multilayer perceptron network with backpropagation training and algorithm from Levenberg-Marquardt. The training was programmed in the software Matlab TM. The architecture of the ANN was determined by empirical methods by varying the number of neurons and neural layers until it reaches an acceptable error. After such trainings, it was developed a program to perform the flow calculations in an foundation fieldbus environment using Emerson Process Management\'s DeltaV TM software. The results were obtained with an average relative error of flow rate of 1.43% for the first scenario using an orifice plate and air as a process fluid, and 0.073% for a second scenario using an orifice plate and natural gas as the fluid related to the values obtained from Rosemount 3095MV TM multivariable instrument. The values of error found validate the method developed in this dissertation.
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Zainescu, Florin Iulian. "Fluvio-marine interactions and sediment dynamics in river mouth areas." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0697.
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Cette thèse s’est construite autour du fait établi que la zone d’embouchure a joué un rôle central dans le développement du delta du Danube et de l’hypothèse selon laquelle les embouchures, étant des pourvoyeurs pour la côte en sédiments et en eau douce, sont essentielles à la compréhension des côtes sous influence d’embouchures. Cette thèse est basée sur des données de terrain, notamment des levés bathymétriques, des mesures de débit fluvial et de décharge sédimentaire, des données de vagues, vents et courants, ainsi que des profils topographiques et des images satellites. Une grande partie de cette thèse est consacrée à l’utilisation de Mike 21/3 by DHI (Danish Hydraulic Institute), un modèle couplant hydrodynamique et vagues. Les résultats montrent une réponse linéaire dans les changements bathymétriques en relation avec l’influence des inondations et des tempêtes, ces changements peuvent être prédits par un index innondation/tempète basé sur le débit fluvial, la décharge sédimentaire et la hauteur des vagues (R^2=0.84). Des simulations de modélisation exploratoire sont développée pour une gamme complète de conditions. La déflexion du jet est prédit en fonction de l’équilibre entre débit fluvial et courant longshore, ainsi le jet sortant est dévié (ou non-dévié) quand le courant longshore est dominant (ou dominé) sur le débit fluvial. Finalement, la thèse esquisse un schéma préliminaire du transport sédimentaire sur le lobe deltaïque de l’embouchure St. Gheorghe et décrit les actions nécessaires pour envisager au complet le système de transport sédimentaire, indispensable à une gestion réussie de cette côte deltaïque<br>This thesis started from the observation that river mouths play a central role in the development of the Danube Delta and from an intuition that river mouths, as suppliers of sediment and water to coastal areas are quintesential in understanding river-influenced coasts. The present thesis is based on field data which comprises bathymetric surveys, measured river water and solid discharges, wave and wind data, ADCP data, topographic profiles, satellite imagery. Also, a big part of the thesis is dedicated to using the Mike 21/3 by DHI (Danish Hydraulic Institute), a coupled hydrodynamic and wave model.Results show a linear response in bathymetric change in relation to the relative influence of floods and storms and that change can be predicted by a Flood/Storm index based on river water or sediment discharge and wave height proxies (R^2=0.84). Furthermore, the analysis is extended using exploratory modelling to a full range of conditions. Jet deflection is predicted by a balance of river jet discharge and longshore current discharge, such that the jet is deflected (undeflected) when the longshore current is much higher (much lower) than the river jet, and a ~45* deflection is predicted when the discharge of jet equals the discharge of the longshore current.Finally, the thesis sketches a preliminary scheme for the sediment transport at the wave-influenced Sf. Gheorghe lobe, taking into account the known sources and sinks, based on bathymetric measurements and numerical modelling results; and outlines the actions needed to envisage a full sediment transport scheme which is needed for a successful management of the deltaic coast
9
Franco, Tarcila. "Utilização de proxies geoquímicos para análise dos padrões de sedimentação na plataforma continental interna adjacente a Foz do Rio Doce (ES)." reponame:Repositório Institucional da UFES, 2013. http://repositorio.ufes.br/handle/10/2010.
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Dissertação final Tarcila oficial (1).pdf: 1813884 bytes, checksum: 756128602e875dcb32bc26ce60ad8a9c (MD5)<br>Na cidade de Linhares (ES) o rio Doce deságua no Oceano Atlântico formando uma
feição deltaica na Plataforma Continental adjacente. Os sedimentos que compõem o delta
tem origem na bacia hidrográfica do Rio Doce que é a maior em volume de vazão em
/s e área de drenagem do estado capixaba. Ao longo das últimas décadas a bacia
passou por um intenso processo de ocupação, transformação e interferências diretas no
canal principal. O objetivo do presente trabalho foi analisar proxies geoquímicos presentes
no depósito deltaico do rio Doce e determinar um padrão deposicional através do
comportamento dos elementos. Para isso foram realizadas análises sedimentológicas, de
teor de matéria orgânica e nutrientes, concentração de metais e taxa de sedimentação em
testemunhos coletados na plataforma continental adjacente a desembocadura do rio
Doce, DT01 SUL (coletado ao Sul da desembocadura), DT02 NORTE (ao Norte) e suas
respectivas réplicas, DT01R SUL e DT02R NORTE. Os testemunhos apresentaram
composição de granulometria fina em sua maioria com maiores percentuais em DT01
SUL em relação a DT02 NORTE. O conjunto dos resultados obtidos para teor de água,
densidade e porosidade identificaram um pacote sedimentar de deposição recente em
DT01R SUL e sedimentos em DT02R NORTE com maior compactação. Sendo os pontos
equidistantes da desembocadura, as maiores taxas de sedimentação encontradas em
DT01R SUL indicam o maior aporte de sedimento para a região Sul em relação a região
Norte, onde foi coletado o testemunho DT02R NORTE. Não foi possível identificar a fonte
efetiva do material orgânico em DT01 SUL a partir da razão C/N, visto que os resultados
situaram-se na faixa de transição entre fontes terrestres e marinhas. Em DT02 NORTE
ficou clara a importância da produção autóctone visto que a razão C/N ficou na faixa da
matéria orgânica de origem marinha. Os valores de Cu estiveram próximos aos naturais
com algumas exceções principalmente em DT01 SUL. Já os valores de Pb excederam o
valor encontrado no background em ambos os testemunhos podendo indicar maior
influência do aporte antrópico. Assim, por meio dos resultados obtidos do comportamento
de proxies no delta do Rio Doce foi possível identificar uma deposição preferencial do
sedimento fino transportado pelo rio através da Plataforma Continental adjacente em
direção ao Sul da desembocadura.<br>In the Linhares city (Espírito Santo State), the Doce River empties into the Atlantic
Ocean forming a deltaic feature on the Continental Shelf. The sediments that make up the
delta come from the Doce River basin that is the largest in volume flow e drainage area in
the State of Espirito Santo. Over the last decades the basin has undergone an intense
process of occupation, processing e direct interference in the main channel. The objective
of this study was to analyze geochemical proxies present at the Doce River deltaic deposit
e determine a pattern of behavior by these depositional elements. For analyzes were
performed sedimentological characteristics, organic matter e nutrients contents, metals
concentration e sedimentation rates in cores collected on the continental shelf adjacent to
the mouth of the Rio Doce. The cores were DT01 SOUTH (collected south of the mouth),
DT02 NORTE (collected north) e their replicas, DT01R SOUTH e DT02R NORTE. The
cores presented a composition of higher percentage of fine sediments in DT01 SOUTH
compared to DT02 NORTE. The set of results obtained for water content, density e
porosity identified a package of sedimentary recent deposition in DT01R SOUTH e DT02R
NORTE sediments with higher compression. Being the points equidistant from the mouth,
the highest sedimentation rates found in DT01R SOUTH indicate the major input of
sediment to the South compared to the North. The C/N ratio in DT01 SOUTH was unable
to identify the source of the organic material since the results were located in the transition
zone between land e marine sources. In DT02 NORTH became clear the importance of
autochthonous production as the C/N ratio was in the range of organic matter with marine
origin. Cu values were close to natural with some exceptions mainly in DT01 SOUTH. The
values of Pb exceeded the value found in the background on both cores may indicate a
greater influence of anthropic contribution. Thus, the results obtained through the behavior
of proxies in the delta of Rio Doce was possible to identify a preferential deposition of fine
sediment carried by the river via the Continental Shelf adjacent to the South of the mouth.
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Boya, Duocastella Salvador. "El sistema deltaico de la Arenisca de Sabiñánigo y la continentalización de la cuenca de Jaca." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665452.
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La cuenca de Jaca representa un ejemplo excepcional de relleno sedimentario de una cuenca piggyback. Su registro estratigráfico muestra la evolución desde la sedimentación marina profunda durante el Eoceno inferior, hasta la irrupción de ambientes transicionales y continentales que evidencian la colmatación de la cuenca durante el Eoceno superior y Mioceno. Estas características, y la calidad de sus afloramientos ha convertido a esta cuenca en un análogo de referencia en los estudios de geología sedimentaria.
En esta tesis se ha realizado una revisión de las formaciones deltaicas y aluviales de la cuenca de Jaca, definidas previamente en base a criterios descriptivos, con el objetivo de establecer sistemas deposicionales de carácter genético a partir de indicadores a escala de cuenca. Para ello se ha aplicado una metodología fundamentada elaboración de una cartografía geológica y el análisis de facies, este último, focalizado especialmente en las unidades deltaicas relacionadas con el sistema deltaico de la Arenisca de Sabiñánigo. Mediante la combinación de ambas técnicas se han diferenciado 8 sistemas deposicionales en la cuenca de Jaca.
Entre estos 8 sistemas deposicionales destacan los sistemas deposicionales deltaicos (Bartoniense a Priaboniense) los cuales presentan cierta complejidad debido a la desconexión física presente en la cuenca entre el sector de Jaca y Fiscal. A partir de la integración de los datos estratigráficos de campo obtenidos en esta tesis, con datos paleomagnéticos y bioestratigráfico presentes en la literatura, se ha podido establecer una equivalencia entre los sistemas deltaicos en el sector de Jaca central (parte central de la cuenca) y los del sector de Fiscal (parte oriental de la cuenca). Dichas equivalencias, permiten establecer una nueva correlación entre ambos sectores con la que se asume un rango de edades más jóvenes para las unidades de Fiscal.
El estudio de los sistemas deposicionales deltaicos se ha centrado en detalle en el sistema deltaico de Sabiñánigo, cuya excelente calidad en cuanto a exposición, conexión y extensión de sus afloramientos, ha permitido elaborar un estudio de facies exhaustivo.
El análisis de facies ha permitido caracterizar dicho delta como un delta dominado por avenidas fluviales a partir de flujos hiperpícnicos de procedencia norte que dominan el sector de Jaca central. Durante los periodos transgresivos, los sedimentos hiperpícnicos muestran retrabajamiento por procesos mareales desarrollando sistemas de barras mareales.
De manera coetánea en el sector de Fiscal, se desarrolla el sistema deltaico de San Felices Superior, caracterizado como un sistema dominado por inercia. Este sistema con procedencia este interacciona con los sistemas de procedencia norte en el sector de Jaca. Dicha interacción se manifiesta en los sedimentos mareales donde se han observado señales petrográficas de procedencia este, también por la presencia de sedimentos de plataforma externa en el flanco sur del anticlinal de Basa.
Por último, se ha podido documentar un control tectónico en la ciclicidad deltaica de estos sistemas. Por un lado, el sistema deltaico de Sabiñánigo muestra estratos de crecimiento atribuibles a la actividad del cabalgamiento de Otúria. De igual manera, el sistema deltaico de San Felices Superior muestra estratos de crecimiento en su extremo oriental relacionados con el anticlinal de Boltaña. Los episodios activos de cada una de estas estructuras producen una alteración de carácter local en el espacio de acomodación, generando episodios de transgresión forzada en los sistemas deltaicos.
En este trabajo se resalta el valor del análisis detallado de facies como herramienta clave para interpretar los diferentes factores que influyen en la arquitectura de los sistemas sedimentarios en un contexto tectónico activo, como la cuenca Surpirenaica. Además, esta tesis presentar el sistema deltaico de Sabiñánigo como un excelente análogo de campo de un delta dominado por avenidas.<br>The Jaca basin is an exceptional example of sedimentary infill of a piggyback basin. Its stratigraphic record shows the evolution from deep-marine environments during the lower Eocene until the its evolution to the transitional and terrestrial environments that represent de last stage of the basin fill during the upper Eocene-Miocene. This features, and the excellent exposure of the outcrops, allow to highlight this basin as an excellent analog in many studies related to sedimentary geology.
In this thesis, a review of the delta and alluvial formations of the Jaca basin, classically defined in a descriptive sence, has been carried out in order to establish genetic depositional systems based on basin scale indicators. In order to achieve this goal a methodology based on the elaboration of a geological cartography and facies analysis has been applied, this last one, focused chiefly on the deltaic units related to the Sabiñánigo Sandstone delta system. Through the combination of both techniques, 8 depositional systems have been differentiated in the Jaca basin.
Among these 8 depositional systems, the deltaic depositional ones (Bartonian to Priabonian) stand out as complex systems due the present-day lack of physical correlation in the basin between the Jaca and Fiscal sectors. From the integration of stratigraphic field data obtained in this thesis, with paleomagnetic and biostratigraphic data from the literature, it has been possible to establish an equivalence between the deltaic systems in the central Jaca sector (central part of the basin) and those of the Fiscal sector (eastern part of the basin). These equivalences allow establishing a new correlation between both sectors which allows to propose younger age range for the Fiscal units.
Deltaic depositional systems analysis has been here focused in more detail on the Sabiñánigo Sandstone delta system, whose excellent quality in terms of exposure, connection and extension of its outcrops, has allowed to carry out an exhaustive facies study.
Facies analysis has permitted to characterize this delta as a flood-dominated delta derived from hyperpycnal flows sourced from the north of the Jaca basin. During transgressive periods, the hyperpycnal sediments where reworked by tidal processes which developed systems of tidal bars.
Synchronously, in the Fiscal sector, the upper San Felices delta system was formed as an inertia dominated delta. This system, with an eastern provenance signal, interacted with the north-derived deltas in the Jaca sector. This interaction is displayed by the recording of an eastern provenance signal in the tidal sediments, and also by the occurrence of outer shelf deposits in the southern flank of the Basa anticline.
Finally, it has been possible to identify a tectonic control in the deltaic cyclicity of these systems. The deltaic system of Sabiñánigo shows growth strata which can be linked to the activity of the Otúria thrust. In the same way, the upper San Felices delta system shows growth strata in its eastern edge related to the growth of the Boltaña anticline. The active stages of each of these structures produced an alteration in the accommodation rate, generating episodes of forced transgression in the deltaic systems.
In this work, the importance of detailed facies analysis is highlighted as a key tool to infer the different factors that can modify the architecture style of sedimentary systems in an active tectonic context, such as the South Pyrenean basin. In addition, this thesis presents the deltaic system of the Sabiñánigo Sandstone delta system as an excellent field analog of a flood dominated.
11
Rubi, Romain. "Caractérisation des systèmes sédimentaires profonds en contexte de rift actif : étude intégrée des affleurements Plio-Pléistocène et des données sismiques du Golfe de Corinthe, Grèce." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1B036/document.
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Le profil de dépôt syn-rift d’un Gilbert-delta et de son prodelta du Pléistocène moyen est documenté dans le Rift de Corinthe en Grèce, à partir d’études de terrain et d’un modèle photogrammétrique. Les études de terrain ont permis de mettre en évidence quatre typologies de bottomsets avec des facies, des associations de facies et des géométries spécifiques : (1) des bottomsets de sables et de graviers, (2) un épisode d’érosion et de bypass, (3) un bottomset de sables fins et de silts, (4) un bottomset de sables massifs. Ces typologies sont intégrées dans le cadre stratigraphique du delta. Dans le prodelta associé, deux moats actifs remplis de sables et de conglomérats sont limités par un drift confiné. L’axe des moats migre à contre pente et est perpendiculaire au delta. Dans l’axe des moats, une séquence normale est remaniée en une séquence inverse dans la partie avale sous l’action des courants de fond. Le drift asymétrique développe une sediment-wave sur son flanc long avec deux séquences : (1) une séquence turbiditique strato- et grano-décroissante directement sur une surface d’érosion et (2) une séquence contouritique bi-gradationelle avec des rides de courant, des bancs ondulés, de la bioturbation et des encroutements ferrugineux. De nouvelles cartes d’horizon, structurales, morphodésimentaires et d’épaisseurs sont proposées à partir de l’interprétation des données sismiques avec un pas de temps de 100 ka. Ces éléments documentent la formation d’un système mixte contouritique et turbiditique profond dans le Golfe de Corinthe. Au Sud deux systèmes se développent en pied de pente : un système de bottomsets gravitaires et un système de moat érodant et remobilisant les sédiments pour former des drifts. Au Nord, la pente est remaniée en sediment-wave et par des moats perchés qui produisent des plastered drifts. A 0,4 Ma, un système dominé par les coutourites, dans le Golfe de Corinthe, indique une possible ouverture à l’Est et à l’Ouest<br>Middle Pleistocene Gilbert-type delta and prodelta in the Rift of Corinth, Greece, are investigated combining field methods and photogrammetric 3D model to document an entire early synrift sedimentological profile. Field works document four different dynamics in Gilbert-type bottomset deposits, each one of which is characterized by a specific range of facies, facies associations and geometries: (1) the sandy-gravelly bottomset, (2) the erosional-bypass stage, (3) the fine-grained bottomset and (4) the massive-sandy bottomset. The bottomset typologies are integrated within the stratigraphic delta context. In the associated prodelta, two active sandy-conglomeratic moats are limited by a confined drift. The prodelta moat axis are perpendicular to the delta and migrate upslope. In the moat axis, a normal-to-inverse grading sequence evolution is correlated down-flow under bottom-current processes. The asymmetric drift presents a sediment-wave architecture on its long side within two sequences : (1) a normal turbidite sequence with a sharp erosional base and massive silt to shale and (2) a contourite bi-gradational sequence affected by red crust, wavy bedding, current ripples and bioturbation. New interpretations of seismic data resulting in horizon, structural, morphosedimentary, and thickness maps, for the offshore Corinth Rift, at a 100 kyr time scales document a mixed turbiditic and contouritic deep water system. The Southern slope break presents a mixed system between gravity-driven bottomset and bottom-current moats which rework and depose drifts. The Northern slope is meanly reworked by sediment-wave and perched drift which can produced plastered drifts. At 0.4 Ma, a contouritic sedimentary system dominates the Gulf of Corinth and indicates an opening at both West and East tips
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Hales, Wendy J. "The impact of human activity on deltaic sedimentation, marshes of the Fraser River delta, British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ48641.pdf.
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Nijhuis, Austin. "Fluvio-deltaic response to relative sea-level fall: A case study of the Goose River delta, Labrador, Canada." Thesis, Boston College, 2013. http://hdl.handle.net/2345/bc-ir:104083.
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Thesis advisor: Douglas Edmonds<br>Due to their low-lying position near the shoreline, river deltas are vulnerable to fluctuations in relative sea-level (RSL). Moreover, relatively little is known about fluvio-deltaic dynamics during RSL fall because the resulting deposits have low preservation potential. In this paper, I present a field-based study of the Goose River delta, coupled with numerical model simulations, that investigates the fluvio-deltaic response to RSL fall. The Goose River delta is a sandy fjord delta at the mouth of the Goose River located at the western end of Lake Melville, an inlet of the Labrador Sea, Canada and has experienced a RSL fall of 3 to 6 mm/yr in the past 5000 years due to post-glacial isostatic rebound. Aerial images show three abandoned delta lobes and one active lobe, suggesting that avulsions and lobe-switching occurred during RSL fall. Elevation analysis using Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) data and optically-stimulated luminescence (OSL) dating suggest that a series of downstepping terraced delta lobes formed at the mouth of the Goose River during a period of RSL fall. Similarly, Delft3D model runs show continued avulsions and formation of multiple terraced delta lobes deposited at progressively lower elevations. I show computationally that by decreasing delta lobe widths, deltas may remain aggradational during RSL fall, creating conditions favorable for lobe-switching during RSL fall. Observations from the field and model runs provide a critical link in understanding the geomorphic processes occurring during RSL fall, and in particular show that 1) incision and sediment bypass is not a necessary response to RSL fall and 2) lateral migration of a delta via avulsion can continue to occur with falling sea-level<br>Thesis (MS) — Boston College, 2013<br>Submitted to: Boston College. Graduate School of Arts and Sciences<br>Discipline: Geology and Geophysics
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Mobley, Casey. "Late Quaternary Louisiana Shelf-Margin Deltaic Deposition, North-Central Gulf of Mexico." ScholarWorks@UNO, 2005. http://scholarworks.uno.edu/td/237.
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This study aims to establish a depositional framework for an area of the Louisiana shelf, north-central Gulf of Mexico. The depositional history of the study area is poorly understood, especially within the last cycle of major eustatic fluctuation (~18, 000 yrs BP – present). Data sets used in this study include pre-existing and previously unanalyzed two-dimensional, highresolution seismic profile records (Acadiana 86 and Acadiana 89), geotechnical foundation boring data (Coleman and Roberts, 1988a), and an industry lease block survey report (Cole, 1983). Seismic sequence stratigraphic methods are employed in this study to analyze seismic profile data. Seismic sequence analysis results indicate the presence of five unconformable surfaces and five seismic facies units. Through correlation of seismic profile data with lithologic and chronologic data, it is possible to conclude that these seismic facies units represent shelf-margin deltaic deposition during the last lowstand of sea level (~18, 000 yrs BP), sourced by the Pearl River. .
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Owoyemi, Ajibola Olaoluwa. "Sequence stratigraphy of Niger Delta, Delta field, offshore Nigeria." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2768.
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The Niger Delta clastic wedge formed along the West Africa passive margin. This wedge has been divided into three formations that reflect long-term progradation: 1) pro-delta shales of the Akata Formation (Paleocene to Recent), 2) deltaic and paralic facies of the Agbada Formation (Eocene to Recent) and 3) fluviatile facies of the Benin Formation (Oligocene-Recent). This study combines a three-dimensional seismic image with well log data from Delta field to describe lithic variations of the Agbada Formation and develop a sequence stratigraphic framework. The 5000-feet thick Agbada Formation in Delta field is divided by five major sequence boundaries, each observed in seismic cross sections to significantly truncate underlying strata. Sequence boundaries developed as mass flows eroded slopes steepened by the structural collapse of the Niger Delta clastic wedge. Basal deposits directly overlying areas of deepest incision along sequence boundaries formed by the migration of large, sinuous turbidite channels. Upward-coarsening sets of inclined beds, hundreds of feet thick, record progradation of deltas into turbidite-carved canyons and onto down faulted blocks. Thinner, more continuous seismic reflections higher within sequences are associated with blocky and upward-fining well-log patterns interpreted to reflect deposition in shoreline, paralic, and fluvial environments.
Episodes of structural collapse of the Niger Delta clastic wedge appear to be associated with progradation of Agbada Formation sediments and the loading of underlying Akata Formation shales. Progradation may have been more rapid during third order eustatic sea level falls. Effects of syn-sedimentary deformation on patterns of sediment transport and deposition are more pronounced in lower sequences within the Agbada Formation, and include: 1) incision into foot walls of listric normal faults, 2) abrupt reorientation of channelized flow pathways across faults, and 3) thinning of deposits across crests of rollover anticlines on down thrown fault blocks. Structural controls on deposition are less pronounced within younger sequences and canyon incisions along sequence boundaries are more pronounced, suggesting that the locus of sediment accumulation and structural collapse of the clastic wedge moved farther basinward as accommodation was filled in the area of Delta field.
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Bennerhag, Emma. "Att delta eller inte delta : exemplet idrott och hälsa." Thesis, Örebro University, Department of Education, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-1477.
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<p>Uppsatsen belyser skolk och dess existens i skolämnet idrott och hälsa. Skolk börjar och förekommer främst i grundskolans senare del. Det finns både för- och nackdelar med att träna, och skolan vill lära alla elever hur de ska skapa och/eller bibehålla en sund livsstil som främjar deras hälsa fysiskt och psykiskt. De elever som inte deltar i idrottsundervisningen går</p><p>miste om detta och avsikten med uppsatsen var att ta reda på hur skolkandet ser ut och få exempel på hur det går till, samt av vilka anledningar vissa elever gör detta. De frågeställningar som besvarades var:</p><p>1. Varför skolkar elever från idrott och hälsa?</p><p>2. Vad påverkar eleven att skolka?</p><p>3. Bidrar skolkandet i idrott och hälsa till en negativ syn på idrott?</p><p>Syftet var att få en kvalitativ studie, genom att undersöka exempel på fenomenet skolk i idrott och hälsa. Att bara skrapa på ytan av problemet eller att få generella svar var inte önskvärt, utan undersökningens intention var att erhålla djupare orsaker till skolk. För att få kvalitativa svar valdes intervju som metod. Fyra personer i skiftande ålder, som skolkat från idrottslektioner under deras högstadieperiod, deltog i studien och alstrade i ett fylligt material att utgå ifrån.</p><p>Anledningarna och förklaringarna till skolkande och bakomliggande åsikter var väldigt varierande. Det fanns mycket som kunde spela in på varför personerna skolkade, och många</p><p>knöt an till lärarens inverkan på deras val. Förståelsen för vikten av att ta hand om sin kropp och hälsa var gemensamt för de intervjuade, men att utföra det praktiskt, (det vill säga träna), var det inte alla som gjorde. Det kom även fram goda förslag på hur de hellre hade sett att idrott-och-hälsa-lektionerna utspelat sig. Svaren på forskningsfrågorna blev följande:</p><p>1. Eleverna hade dåligt förhållande till sin lärare, som kunde utspela sig på olika sätt,</p><p>men det gjorde att de valde att hitta på ursäkter att inte delta. Det fanns en ointresserad lärare, en nedvärderande lärare, ouppmärksam lärare, en för sträng lärare och så vidare. I stort sett ingen av de förklaringar de gav sina undervisande lärare, var detsamma som den egentliga orsaken till att inte delta. Eleverna kände inte motivation att vara med på lektionerna.</p><p>2. Den dåliga relationen till respektive lärare påverkade att de inte ville delta. Vänner påverkade också eleverna att skolka, och i ett fall var det att inte ha några vänner som inverkade. Föräldrar uppgavs inte ha påverkat dessa elever.</p><p>3. Skolkandet medförde inte att dessa personer hade dålig inställning till motion och rörelse idag, vilket motsäger vad statistik visar. Samtliga visste fördelar med att se över sin hälsa, men alla var inte aktiva för att främja sitt välmående.</p><p>Ytterligare aspekter som blev tydliga i arbetet, var hur man kan arbeta som lärare för att motverka skolk. Många bra åsikter om vad som hade kunnat göras för att dessa elever skulle ha deltagit, kom upp. Enligt eleverna kunde mycket skolk ha förhindrats genom en mer demokratisk lärare som lyssnat och sett till alla elever och deras behov. Mycket kom upp om vad som kan göras för, att i största möjliga mån, undvika att elever skolkar från lektioner, men det kräver en stor insats och engagemang för en lärare. Dock kommer aldrig alla elever att</p><p>delta i idrott och hälsa. Har en lärare som mål att alla elever ska delta, kan denne komma en bit på vägen. Denna uppsats utgör en grund för att skapa förståelse hos skolans lärare och</p><p>ledning till hur skolk kan uppstå och motverkas.</p>
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McMahon, Gerard Armstrong. "An integrated hydrogeological/hydrogeochemical approach to characterising groundwater zonations within a quaternary coastal deltaic aquifier: The Burdekin River delta, North Queensland." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15939/.
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Despite being one of the largest aquifers of its type in Australia, the Burdekin River Delta (BRD) is an area that has received comparatively little research on its groundwater resources. This study conceptualises the hydrogeology of the BRD and characterises the relationships between the stratigraphic elements and the physical and chemical components of the groundwater system that influence the major governing processes. Importantly, a large amount of spatial and temporal groundwater information exists in database form, which enables an integrated conceptual model of the BRD aquifer to be developed from the key hydrogeological and hydrogeochemical relationships. Conceptualisation of the BRD aquifer is achieved by categorising four main aspects of the groundwater resource: 1. Surface characterisation; 2. Geologic characterisation; 3. Hydrogeologic characterisation; and 4. Groundwater System characterisation. The BRD is a large cuspate delta comprising a complex stratigraphy of Pleistocene to Holocene sediments of fluvial, deltaic and marine origin to a maximum depth of about 150 metres. The lower Pleistocene sediments lie predominantly below sea level and are typified by laterally discontinuous sands, silts and clays that have formed in response to fluctuating sea levels. The upper Pleistocene boundary is differentiated from the overlying Holocene sediments by a formerly exposed surface of semiconsolidated oxidised sandy clays and gravel. By contrast, the Holocene sediments comprise loose, uncompacted sequences of fluvial channel sands, interdistributary floodplain silts and marine incursions of estuarine clays and mangrove muds. The anastomosing array of fluvial sand bodies of former Burdekin River channels and levees is the setting for the main shallow aquifer units. Aquifer units of the lower Pleistocene sediments are in hydraulic connection with the Holocene units, effectively categorising the whole BRD as a single unconfined aquifer. Hydraulic gradients from both sides of the river divide the BRD into two broad flow regimes. Interpreted flow zones based on hydrograph patterns further subdivide the flow system based on seasonal recharge response to elevated river heights and flooding, and response to long-term rainfall patterns associated with La Niña episodes of the Southern Oscillation. Stable isotope data (2H and 18O) indicate that the dominant isotopic signature of groundwater throughout the BRD corresponds with intense rainfall activity, however high deuterium-excess values indicate that significant evaporation occurs prior to recharge. This infers dominant recharge by the Burdekin River that drains a massive catchment extending hundreds of kilometres inland. Direct recharge via rainfall infiltration is largely dependant on soil texture. More conductive soils are associated with the major levee systems that comprise the main shallow aquifers. Two evolutionary hydrogeochemical paths exist for the north and south sides of the river, and are constrained by the interpreted flow zones. In the south side, groundwater enters the main aquifer from river recharge and leakage out of weathered granite outcrops (exposed bedrock). Mineral hydrolysis and evaporative concentration of salts initially evolve groundwater in the weathered granite to a combination of Na-Cl and Na-HCO3 type. Leakage through clay-rich hillwash and marginal sediments causes reverse cation-exchange reactions where excess Na replaces Ca and Mg on ion-exchange surfaces. This leads to the formation of Mg,Ca-Cl type groundwaters into the southern parts of the main aquifer (supersaturated with respect to calcite and dolomite). Discharge towards the coast is characterised by seawater mixing where salinity increases with corresponding evolution to Na-Cl type waters. Recharge waters from the Burdekin River are fresh (<250mS/cm) Ca-HCO3 type, undersaturated with respect to calcite, and are easily distinguishable from the ion-exchange groundwater. In the north, only one smaller outcrop of bedrock exists, which hosts similar mineral hydrolysis reactions and base-exchange reactions. An absence of associated Na-Cl type waters means that reverse-cation exchange reactions are negligible, and so water types are predominantly Na-HCO3 type. Aquifer sands in the north are more widespread than in the south, so the fresh Ca-HCO3 recharge waters tend to dominate the overall groundwater composition, with Na-HCO3 types limited to the exposed bedrock areas. Towards the coastline, groundwater mixes with seawater towards Na-Cl type waters, similar to that observed in the south. The mangrove mud sequences that flank the coastline of the BRD are associated with high-Fe and low-pH groundwater formed by the oxidation of Fe-sulphides such as pyrite). SO4 is a product of this reaction, but does not achieve abnormally high concentrations, possibly due to the presence of sulphate-reducing bacteria. Carbonate dissolution is a possible side effect of acid sulphate generation, with possible gypsum dissolution as a secondary source of SO4. This study tested an alternative method to characterising groundwater to determine if the spatial extent of hydrogeochemical processes could be defined and comparable results achieved. This method involved discriminating discrete statistical groups of ionic ratios based on their cumulative frequency distribution. The statistical groups are bounded by critical values that distinguish different chemical processes, referred to as hydrogeochemical indicators. Various tested ionic ratios produced analogous indicators, proving their reliability as a valid method for the characterisation of groundwater chemistry. The significance of this research underlies the importance of groundwater use in the BRD as a primary source of irrigation supplies. Land use expansion and unregulated pumping pose a risk to future groundwater quality and sustainable volumes. The understanding of the relationship between the main geologic elements and the subsequent hydrogeochemical processes provides a scientific basis for conceptualising the groundwater resource. This establishes a framework for initiating future groundwater management options.
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Chang, Chi-Chun, and n/a. "Interaction between delta epithelial sodium channel ([delta]ENaC) and COMMD1." University of Otago. Department of Physiology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080512.123318.
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The epithelial sodium channel (ENaC) is a key regulator of salt homeostasis. The classic ENaC consists of three subunits: α, β and γ, which are highly expressed in the kidney and colon where they mediate electrogenic Na⁺ influx into cells under the tight hormonal regulation of aldosterone.
A fourth ENaC subunit named [delta]ENaC also generates Na⁺ influx with the β- and γENaC subunits in Xenopus oocytes. However [delta]ENaC differs to the other subunits in its channel properties and tissue distribution, suggesting that [delta]ENaC may possess a physiological role other than salt regulation. A copper-toxicosis related protein called COMMD1/Murr1 was previously identified to directly interact with [delta]ENaC and downregulate [delta]ENaC activity. COMMD1 is linked with multiple ubiquitination pathways, therefore we hypothesised that COMMD1 directly interacts with [delta]ENaC through novel protein-protein interaction motifs and promotes internalisation of [delta]ENaC from the cell surface through enhanced ubiquitination.
With the use of GST pulldown assays and coimmunoprecipitation, it was found that the binding of COMMD1 to [delta]ENaC is mediated by the COMM domain of COMMD1, primarily through amino acids 120-150 of COMMD1. Immunocytochemical studies showed that the intracellular interaction between [delta]ENaC and COMMD1 predominantly occurred in the early and recycling endosomes, suggesting that COMMD1 may promote the retrieval of [delta]ENaC from the cell surface to the intracellular pool. COMMD1 mediated a decrease in the [delta]ENaC cell surface population, as shown by a biotinylation surface labelling assay. This may be driven by an ubiquitin-regulated endocytosis, as COMMD1 increased ubiquitination, but not proteasomal/lysosomal degradation, of [delta]ENaC. COMMD1 may promote [delta]ENaC ubiquitination through the action of the ubiquitin ligase Nedd4-2 as coexpression with Nedd4-2 enhanced the COMMD1-mediated decrease in surface [delta]ENaC expression. This is abolished by the addition of the Nedd4-2 downregulator kinase sgk1, suggesting that COMMD1 may downregulate [delta]ENaC through the Nedd4-2/sgk1 pathway. Surface levels of [delta]ENaC may also be affected by XIAP, a RING domain ubiquitin ligase which is able to decrease the levels of COMMD1. Coimmunoprecipitation of endogenous [delta]ENaC and COMMD1 proteins, and the enhanced colocalisation of endogenous [delta]ENaC in the recycling endosomes with transfected COMMD1, indicate that interaction between transfected [delta]ENaC and COMMD1 reflect the intracellular interactions of the endogenous proteins.
Taken together, these findings suggest that COMMD1 downregulates [delta]ENaC activity by promoting the internalisation of surface [delta]ENaC into early and recycling endosomes and this may be mediated by enhanced [delta]ENaC ubiquitination via the ubiquitin ligase Nedd4-2.
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Toll, Oliver, and Lisa Williamsson. "Varför deltar du? : En kvantitativ studie om hur lärarens arbetssätt och ämnets lektionsinnehåll motiverar elever till att delta I ämnet idrott och hälsa utifrån ett könsperspektiv." Thesis, Linnéuniversitetet, Institutionen för idrottsvetenskap (ID), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35684.
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I denna studie undersöktes elevers uppfattningar om hur de anser att lärares arbetssätt, ämnets lektionsinnehåll och om vad som motiverar dem till att delta i ämnet idrott och hälsa. Det un-dersöktes även om det fanns några eventuella skillnader mellan könen, det vill säga om flick-or och pojkar hade olika uppfattningar i frågorna. Enkäter användes och delades ut på en gymnasieskola och besvarades av 105 elever i olika klasser som läste idrott och hälsa 1. Ele-verna som deltog i enkäten valdes ut genom ett bekvämlighetsurval då kontakter på skolan fanns sedan tidigare. Teorin som används genom studien är Deci & Ryans motivationsteori ”Self-Determination Theory”. Resultatet visade att flickor och pojkar motiveras olika mycket av lärarens arbetssätt. Flickor värderar lärarens arbetssätt högre än pojkar. Även vilket lek-tionsinnehåll eleverna motiveras av till att delta på lektionerna samt varför de deltar i under-visningen skiljer sig åt mellan könen. Flickor motiveras mer av faktorer som leder till inre motivation i jämförelse med pojkar exempelvis som att förbättra/upprätthålla hälsan. Pojkarna drivs mer av yttre motivationsfaktorer än flickorna, att vinna på lektionerna eller att få betyg är två faktorer som motiverar dem till att delta. En gemensam motivationsfaktor som får både pojkar och flickor att vilja delta på lektionerna i idrott och hälsa är glädjen till ämnet.
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Adamsson, Karolin. "Delad yta, dubbel yta? : En studie om Dragarbrunnsgatan i Uppsala utifrån konceptet shared space." Thesis, Uppsala universitet, Kulturgeografiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168027.
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Rongemaille, Emmanuelle. "Application des terres rares et de la datation U/Th à l'étude des carbonates authigènes de suintements froids : exemple du delta profond du Niger." Brest, 2011. http://www.theses.fr/2011BRES2074.
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Les zones de suintements froids sont le siège d’expulsions actives de fluides enrichis en méthane auxquels sont associées d’abondantes précipitations de carbonates authigènes. Dans le but de mieux contraindre l'origine et la composition de ces sorties de fluides, cette thèse présente les résultats 7Sr/86Srd'études minéralogique, isotopiques (d13c, d18O et 87Sr/86Sr) et géochimiques (terres rares, U/Th) réalisées sur des carbonates authigènes provenant de différentes sorties de fluides (volcan de boue, diapir, pockmark) du delta profond du Niger. Les valeurs de d18O des carbonates authigènes indiquent que certains ont précipité en équilibre isotopique avec l'eau de fond actuelle alors que d'autres présentent des valeurs qui sont très éloignées de l'équilibre isotopique avec l'eau de fond. Les valeurs de d13C suggèrent diverses contributions de fluides caractérisés par des signatures de d13C distinctes. La composition isotopique du Strontium révèle aussi diverses contributions de fluides. Les spectres de terres rares ressemblent aux spectres obtenus à partir des sédiments marins de sub-surface anoxiques pour l'aragoite. Les calcites magnésiennes et dolomites montrent une gamme de spectres importante au niveau des terres rares lourdes. La composition des terres rares dans les carbonates est contrôlée par : le fluide et l'alcalinité. Les résultats expérimentaux montrent qu'il n'y a pas de fractionnement pendant la précipitation de l'aragonite et de la calcite, mais que le magnésium et la température jouent un rôle dans l'incorporation des terres rares. Les données U/Th montrent que le pockmark est actif depuis au moins 8000 ans et qu'il y a eu un enfoncement de la SMI<br>Cold seeps are common features which correspond to localized sites for methane-rich fluid release. Fluid expulsions are generally associated with abundant precipitation of authigenic carbonates. In order to better constrain fluid origin and composition, this PhD presents the results of mineralogical, isotopic (d13C, d18O and 87Sr/86Sr) and geochemistry (REE) studies on authigenic carbonates from various fluid-venting features (mud volcano, diapir, and cold seep) of the Niger Delta. The d18O values of authigenic carbonates indicate that some precipitated in isotopic equilibrium with present day bottom water conditions, while others have values that are very far from the equilibrium with present day bottom water conditions. The d13C values suggest different contributions of fluids characteriez by distinct d13C signatures. The isotopic composition of strontium also reveals diverse contribution of fluids. Aragonite concretions exhibited very similar shale-normalized REE patterns that closely resembled those of anoxic pore-water in sub-surface marin sediments. The magnesian and dolomite concretions displayed a wide range of HREE patterns. Our results showed that the REE composition of carbonates controlled by the fluid composition and by changes of alkalinity. Experimental results show that there is no fractionation during the precipitation of aragonite and calcite, but as magnesium and temperature play a role in the incorporation of rare earths. Data U/Th show that pockmark is active since at least 8000 years and ther has been a recent sinking of the SMI
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Jönsson, Maria. "ATT INTE DELTA." Thesis, Halmstad University, School of Teacher Education (LUT), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4202.
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<p>Ämnet idrott och hälsa lyfts ofta fram som en viktig komponent för att utveckla en hälsosam</p><p>livsstil. Fysisk aktivitet framhålls av forskare som den viktigaste friskfaktorn. Vid den senaste</p><p>utvärderingen av ämnet idrott och hälsa visade det sig att 16 procent av eleverna inte tyckte</p><p>ämnet var intressant och ett par procent av eleverna deltar aldrig i undervisningen i idrott och</p><p>hälsa. Studiens syfte har varit att undersöka vilka bevekelsegrunder elever i år 7-9 har för att</p><p>inte delta i undervisningen i ämnet idrott och hälsa. Såväl de grunder som eleverna framför till</p><p>sina lärare som de som eleverna inte framför har undersökts. Andra frågeställningar har varit:</p><p>vilka förändringar eleverna önskar för att delta i undervisningen samt hur elevernas skäl att</p><p>inte delta påverkas av den rådande samhällsdiskursen om allt fler inaktiva och/eller</p><p>överviktiga barn. Tre intervjuer med totalt fem intervjupersoner har genomförts och</p><p>analyserats med en hermeneutisk ansats. Resultaten visade att de bevekelsegrunder eleverna</p><p>anger för sina lärare inte är de samma som dc verkliga. Eleverna som intervjuats har en</p><p>negativ inställning till ämnet idrott och hälsa. De upplever att de ingenting lär sig och de är</p><p>rädda att göra bort sig och misslyckas. Några tycker inte att de kommer så bra överens med</p><p>läraren och några tycker inte att dc lever upp till de kroppsideal som förmedlas via</p><p>massmedia. Ingen av eleverna duschar i de duschutrymmen som anvisas. De förändringar som</p><p>eleverna efterfrågar är enskilda duschutrymmen, större valmöjligheter samt mer lek och</p><p>mindre traditionella bollsporter.</p>
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Cremer, Rodolfo. "La fuerza delta." Universidad Peruana de Ciencias Aplicadas (UPC), 2006. http://hdl.handle.net/10757/285423.
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Uno de los problemas más graves que enfrentan las empresas es aterrizar la estrategia en acciones tácticas de cara al cliente; muchos de nuestros directores y gerentes de la plana más alta de la organización son grandes estrategas, sin embargo, el escenario de guerra de los negocios donde miles de soldados llevan a cabo las batallas por los clientes acontece -comúnmente– muy lejos de sus puestos de comando, a donde no llegan ni el ruido de los disparos ni las esquirlas del combate.
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Beavan, Nancy Ragano. "Contribution of diet to [delta]¹⁵N, [delta]¹³C, and [Delta]¹⁴C values in the Pacific rat (Rattus exulans)." Thesis, University of Canterbury. Zoology, 2001. http://hdl.handle.net/10092/6064.
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This thesis is the outcome of a research project undertaken to determine how diet can affect the reliability of rat bone (especially that of Rattus exulans) for accurate radiocarbon analysis. It addresses questions about the reliability of R. exulans bone for radiocarbon dating with respect to the survival of bone in archaeological and natural burial sites, laboratory processing methods, and the extent to which diet influences radiocarbon ages of bone.
I have shown that R. exulans bone can return reliable radiocarbon dates, based on bone survival and the efficacy of chemical treatment to remove burial contamination. In three dietary investigations, stable isotope (13C and 15N) and radiocarbon (14C) analyses of modem populations and archaeological specimens also indicated that Rattus exulans and other omnivorous species can have radiocarbon values influenced by a diet linked to 14C – depleted reservoirs. Moreover, depleted carbon reservoir effects are localised and variable in their magnitude.
Work on modem populations also provided an improved means of isotopic analysis in an ecological study, where bomb-generated radiocarbon (∆14C) signatures in the natural environment were used as for other "tracer" studies, in conjunction with stable isotopes (13C and 15N). Results indicated that the changing atmospheric 14C signal fixed into the biota in a given year by photosynthesis is transferred from plants through trophic levels to end-members, including rats. The additional isotopic "clue" about diet given by radiocarbon analysis offered a better understanding of the variation in diets of R. exulans in different habitats. Variation in the isotopic signal among individuals supported other observations that diets of scavenging rats are opportunistic and associated with faunal availability in different habitats.
To better understand diet-induced radiocarbon variations, I also examined the carbon contribution to bone protein from essential amino acids in the diet. Essential amino acids are the biochemical "messengers" in the carbon transfer from diet to bone protein. I originally proposed that the dietary 14C contribution might be measured by HPLC separation of essential amino acids in bone protein. Analysis of a selection of amino acid separations from protein hydrolysates showed that essential and non-essential amino acids produced widely varying 13C and ∆14C. I hypothesise that the radiocarbon variations in non-essential amino acids may be due to metabolic effects that utilise essential amino acid carbon skeletons in the creation of non-essential amino acids.
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Stirling, Eleanor Jane. "Architecture of fluvio-deltaic sandbodies : the Namurian of Co. Clare, Ireland, as an analogue for the Plio-Pleistocene of the Nile Delta." Thesis, University of Leeds, 2003. http://etheses.whiterose.ac.uk/1398/.
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Understanding and predicting the size, shape and internal architecture of sandbodies is of fundamental importance in hydrocarbon exploration. High quality hydrocarbon reservoirs are often formed in deltaic environments where there is a complex interplay between changes in relative sea level, sediment input and climate. When combined with the intrinsic sedimentary variability of deltas, this makes prediction of the internal facies distributions and architectures of deltaic sandbodies a challenging task. The aim of this thesis is to conduct a detailed qualitative and quantitative field study of fluvial and deltaic sandbody architecture and facies distribution, and to assess the usefulness of the data thus obtained in predicting the architecture and sedimentary characteristics of reservoir sandstones in the subsurface. The El Wastani Formation of the Nile Delta, Egypt, has previously been identified as an interval of reservoir quality sandstones within the Plio-Pleistocene deltaic succession. Limited core data, and poor seismic imaging due to gas seepage effects, hindered past attempts to assess the internal architecture and facies of the sandbodies. Therefore it was considered appropriate to use an outcrop analogue to aid understanding of the El Wastani Formation reservoir characteristics. From a review of literature, the Upper Carboniferous fluvial and deltaic sandstones of the Central Clare Group, County Clare, western Ireland, were found to be suitable analogues for the El Wastani Formation sandstones. Controls on the two sedimentary systems were similar; both were fluvial-dominated and wave-influenced, and both show evidence for fluctuating relative sea-level. Comparisons of facies observed in outcrop (Co. Clare) and interpreted from image logs (Nile Delta) show similar facies and sedimentary successions in the two systems, improving confidence in the choice of analogue. Fieldwork carried out on the Upper Carboniferous (Namurian) coastal outcrops of Co. Clare produced detailed measurements of facies distributions and bed geometries, which, together with sedimentary logs, palaeocurrent studies and outcrop-scale photomontages, enabled interpretation and quantification of channel dimensions, internal architectures and stacking patterns. Based on these data, the Tullig Sandstone, a major sandbody within the Central Clare Group, is interpreted to be a low-sinuosity, braided fluvial system that flowed to the north-northeast. This sandbody shows decreasing amounts of erosion and conglomeratic facies in both downstream and vertical directions, interpreted to reflect the combined effects of delta subsidence and sea-level rise over time, influencing the downstream reaches of the system first. The mean sand to non-sand ratio for the Tullig Sandstone is 97% by area, and connectivity of sandstone facies within this sandbody is 93%. In contrast, mouthbar sandbodies that were studied have a mean sand to non-sand ratio of 90%, and greatly reduced sandstone connectivity, at 65%. The data that characterise the field outcrops can be taken as indicative of the probable characteristics of the El Wastani sandbodies. The data generated from the quantitative field studies were used to construct computer models of the outcrops, in order to see how well the modelling software was able to reproduce the outcrop architectures and facies distributions, and also to test the sensitivity of the models to different scales of data. One large-scale model was built to include all the Tullig Sandstone outcrops along the coastline, with a vertical resolution (cell height) of 1m. A second smaller model was constructed to cover just the Trusklieve outcrop, and was built using a vertical cell height of O.1m. Each model was designed to fit the sedimentary log data, and was conditioned to reflect the facies percentages and channel dimensions measured and calculated respectively from the outcrops. The results showed that although the larger modelling grid, with lower vertical and horizontal data resolution, showed significant differences in finegrained facies distribution from the outcrops, it was reasonably successful at reproducing the channel shapes and stacking patterns seen in outcrop. In addition, the high sand to non-sand ratio meant that sandstone connectivity was not reduced compared with either the outcrops or the small, high-resolution model. The small model was better at reproducing the geometries of beds of fine-grained facies, but lacked the ability to accurately simulate the channel architectures and stacking patterns.
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Åhsberg, Lina. "Att delta eller inte delta? : Kulturparken Småland AB och synen på deltagarperspektivet." Thesis, Linnéuniversitetet, Institutionen för samhällsvetenskaper, SV, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-21631.
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The purpose of this essay is to illustrate how an organisation with several different cultural activities, such as a regional museum, works with anemphasis on participation. The essay focuses on Kulturparken Småland AB, which encourages the public to be more involved in its activities. Aqualitative approach is used, including nine interviews with employees at theorganisation. A number of theories form the basis of this study: institutionaltheory, which focuses on the context of the organisation, Bourdieu’s theoriesof different capital and Abbott’s theory regarding professionals. In the resultsand analyses section, three operators/actors are identified that in differentways impact upon Kulturparken Småland´s work with participation. Theoperators are the following: the cultural politics arena, the general public andthe scientific community. The results demonstrate that these three operatorsplace the organization under different pressures that affect its identity,professions and aspirations of legitimacy.
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Callamand, Pierre. "Etude des desaturases delta 6 et delta 5 hepatiques en periode perinatale." Montpellier 1, 1991. http://www.theses.fr/1991MON11223.
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Landhammar, Sandra, and Lina Pontell. "Förkollärarens roll i barns lekHur deltar förskolläraren i leken? : Hur deltar förskolläraren i leken?" Thesis, Mittuniversitetet, Institutionen för utbildningsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-31925.
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Syftet med vår studie har varit att studera och analysera förskollärares erfarenheter och uppfattningar om vuxnas roll och deltagande i barns lek. Den tidigare forskningen har visat att förskollärare antingen bör ha en närvarande roll i barnens lek eller en observerande roll över barnens lek samt att förskollärarna har i uppgift att ge barnen trygghet, vägledning och inspiration. Studien genomfördes med hjälp av nio förskollärare som intervjuades och resultatet visade att förskollärarna såg leken som en viktig del av barnens vardag för att barnen skulle kunna bearbeta tidigare händelser. Samtidigt framkom det att många av förskollärarna som intervjuades inte gärna deltog i den fria leken då de upplevde att de störde barnen. Förskollärarna som arbetar med de yngre barnen var mer deltagande i leken än vad de som arbetade med de äldre barnen var. I de pedagogstyrda aktiviteterna deltog förskollärarna i större utsträckning än vad de gjorde i den fria leken. Slutsatsen av detta är att förskollärarna deltog i de pedagogstyrda aktiviteterna oavsett ålder medan i den fria leken var det större fokus på att vara deltagande med de yngre barnen då förskollärarna ansåg att de behövde mer vuxenstöd än vad de äldre barnen behövde.<br><p>Godkännande datum: 2017-06-02</p>
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Jonsson, Fredrik. "Ultra Wide Band Sigma-Delta modulator in CMOS090." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2172.
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<p>Today the frequency spectrum is full of wireless standards. The most common technique being used is the frequency modulation. To take advantage of this and the technology improvement a new wireless communication standard is being developed. This standard is using a low power impulse modulation method, allowing it to overlap with other standards. The proposed standard called IEEE802.15.3a is applied at an Ultra Wide Band and has potential to be used both in interchip and intrasystem communication, since it allows a very high data density. </p><p>In this thesis the analog to digital converter is designed, which is one part of a communication system. Although the signal bandwidth is very wide the converter is designed as a Sigma-Delta modulator, which is most suitable for low-speed applications. Its main advantages over high-speed converters are less area and less power consumption. The goal of this project is to investigate if the CMOS090 process technology will be sufficient for reaching a signal-to-noise ratio, SNR, of 30 dB in a signal band of 264 MHz. </p><p>The main limiting factor during the design of the modulator is the excess feedback delay. This delay degrades the SNR and can even make the system unstable. At a feedback delay of 83 ps and a sampling frequency of 6.336 GHz, the maximum SNR achieved was 27 dB. At this high frequency the modulator is close to instability. Hence, to ensure stability a maximum sampling frequency of 4.224 GHz is chosen, achieving a SNR of 19 dB. </p><p>The effect of the feedback delay can be reduced either by using a different structure or by using compensation methods, either of them would probably allow a SNR above 30 dB.</p>
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Messaoudi, Hacène. "Structures tourbillonnaires induites par des obstacles triangulaires complexes et interactions ailes delta minces corps de révolution : application des angles privilégiés en aérothermique et aérodynamique." Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/007ae2d9-29af-46af-bc9a-000d27a369d5.
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Les études qui ont été menées, et qui concernent l'écoulement au dessus des ailes en forme de delta, ont conduit à l'examen particulier des positions relatives des systèmes de deux ou quatre tourbillons. Dans ces systèmes tourbillonnaires, les troisième et quatrième tourbillons se produisent sur les arrêtes des ailes, et de ce fait se confondent avec elles, quand celles-ci forment un angle qui fait partie d'une série d'angles appelée angles privilégiés, le nombre de tourbillons détaché se réduit à deux. Une loi de filiation entre les angles qui, dans tous les cas, sont formés par les arêtes des corps considérés (ailes delta, ailes ogivales, etc. ), et les angles inter-tourbillonnaires a été établie. Par contre, sitôt qu'un corps s'éloigne de manière suffisamment significative de sa simplicité originelle, par exemple lorsqu'une aile présente deux parties planes successives à incidences différentes (ailes pliées ou cassées) ou la partie aval est le plus souvent en incidence plus forte que la partie située en amont, et aussi lorsque l'on courbe longitudinalement l'aile delta (ailes cintrées), ou lorsque l'on constitue une combinaison de corps élancé (aile delta-cône, aile delta-ogive de révolution, il apparait qu'en dessous de certains seuils d'incidence, la simplicité des lois de filiation, qui vient d'être évoquée, s'altère et que les tourbillons d'un même couple, proches d'une couche limite, et que même s'ils sont adjacents à celles-ci, restent toujours reliés par un angle privilégié. Ces tourbillons ne satisfont plus, par rapport à l'angle qui se trouve entre bords d'attaque inducteurs, à une relation aussi simple que dans le cas de l'aile droite plane. Ils adoptent en fonction de l'incidence plusieurs valeurs successives privilégiées, qui sont plus complexes à prévoir et à interpréter que dans le cas du corps de référence non modifié
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Lara, Neliton Ricardo Freitas. "A importância da dimensão alimentar para coexistência de quelônios amazônicos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-29062015-083731/.
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A teoria do limite de similaridade é uma teoria central para o entendimento da estruturação das comunidades ecológicas, e prevê que a coexistência de duas espécies de forma estável somente é possível caso exista um limite de semelhança entre elas. Nesse sentido, é esperado que ocorra partilha de recursos entre espécies simpátricas aparentadas como Podocnemis unifilis e Podocnemis expansa, dois quelônios amplamente distribuídos e de grande importância econômica e cultural na região amazônica. Assim, o objetivo deste estudo foi determinar os padrões de consumo de duas espécies simpátricas de quelônios, P. unifilis e P. expansa, além de verificar possíveis interações tróficas que se estabeleçam entre elas, considerando suas possíveis variações sexuais, no rio Javaés, Estado do Tocantins, Brasil. Desta forma, foram feitas análises dos conteúdos estomacais e análises isotópicas das unhas de indivíduos dessas espécies visando a determinação de suas amplitudes e sobreposições de nicho alimentar e isotópico. As sobreposições de nicho alimentar foram comparadas às sobreposições de comunidade idealizadas sem competição, por meio de modelos nulos. As sobreposições de nicho isotópico foram calculadas através de elipses bayesianas. As espécies apresentaram baixos valores de amplitude de nicho independente da medida. Entretanto, apresentaram alta sobreposição de nicho alimentar e nenhuma sobreposição de nicho isotópico. Amplitudes foram sempre reduzidas e sobreposições sempre elevadas entre os sexos. As diferenças entre as sobreposições de nicho das espécies medidas a partir das duas metodologias se relacionaram a importância de outras dimensões além da alimentar para o nicho isotópico. Os padrões de uso de recursos observados indicam que competição por alimento não está sendo relevante para a coocorrência das espécies no sistema estudado, possivelmente devido à altas disponibilidades dos recursos alimentares utilizados por P. unifilis e P. expansa.<br>The limiting similarity theory is a central theory for the comprehension of the structure of ecological communities, and predicts that the stable coexistence of two species is possible only if there is a limit of similarity between them. Therefore, it is expected to occur resource partitioning among sympatric related species as Podocnemis unifilis and Podocnemis expansa, two freshwater turtles widely distributed and of great economic and cultural importance in the Amazon region. The objective of this study was to determine the consumption patterns of two sympatric species of freshwater turtles, P. unifilis and P. expansa, and to identify possible trophic interactions to be established between them, considering its possible sexual variations, in the Javaés River, State of Tocantins, Brazil. Thus, were made analyzes of stomach content and isotopic analyzes of claws from individuals of these species in order to determine their amplitudes and dietary overlaps of food niche and isotopic niche. The food niche overlaps were compared with overlaps of idealized communities without competition, through null models. The isotopic niche overlaps were calculated using bayesian ellipses. The species had low niche amplitude values independent of the measure. However, the species showed high overlap of food niche and no isotopic niche overlap. Amplitudes were always reduced and overlap always high between the sexes. Differences between the niche overlaps of the species measures due the two methodologies were related to the importance of other dimensions beyond that represented by feeding to the isotopic niche. The observed patterns of resources usage indicate that competition for food is not being relevant to the co-occurrence of these species in the system studied, possibly due to the high availability of food resources used by P. unifilis and P. expansa.
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Seybold, Hansjörg Florian. "Modeling river delta formation /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18263.
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Yuan, Xiaolong. "Wideband Sigma-Delta Modulators." Licentiate thesis, KTH, Communication Systems, CoS, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13212.
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<p>Sigma-delta modulators (SDM) have come up as an attractive candidatefor analog-to-digital conversion in single chip front ends thanks to the continuousimproving performance. The major disadvantage is the limited bandwidthdue to the need of oversampling. Therefore, extending these convertersto broadband applications requires lowering the oversampling ratio (OSR) inorder. The aim of this thesis is the investigation on the topology and structureof sigma-delta modulators suitable for wideband applications, e.g. wireline orwireless communication system applications having a digital baseband aboutone to ten MHz.It has recently become very popular to feedforward the input signal inwideband sigma-delta modulators, so that the integrators only process quantizationerrors. The advantage being that the actual signal is not distorted byopamp and integrator nonlinearities. An improved feedforward 2-2 cascadedstructure is presented based on unity-gain signal transfer function (STF). Theimproved signal-to-noise-ratio (SNR) is obtained by optimizing zero placementof the noise transfer function (NTF) and adopting multi-bit quantizer.The proposed structure has low distortion across the entire input range.In high order single loop continuous-time (CT) sigma-delta modulator, excessloop delay may cause instability. Previous techniques in compensation ofinternal quantizer and feedback DAC delay are studied especially for the feedforwardstructure. Two alternative low power feedforward continuous-timesigma-delta modulators with excess loop delay compensation are proposed.Simulation based CT modulator synthesis from discrete time topologies isadopted to obtain the loop filter coefficients. Design examples are given toillustrate the proposed structure and synthesis methodology.Continuous time quadrature bandpass sigma-delta modulators (QBSDM)efficiently realize asymmetric noise-shaping due to its complex filtering embeddedin the loops. The effect of different feedback waveforms inside themodulator on the NTF of quadrature sigma-delta modulators is presented.An observation is made that a complex NTF can be realized by implementingthe loop as a cascade of complex integrators with a SCR feedback digital-toanalogconverter (DAC), which is desirable for its lower sensitivity to loopmismatch. The QBSDM design for different bandpass center frequencies relativeto the sampling frequency is illustrated.The last part of the thesis is devoted to the design of a wideband reconfigurablesigma-delta pipelined modulator, which consists of a 2-1-1 cascadedmodulator and a pipelined analog-to-digital convertor (ADC) as a multi-bitquantizer in the last stage. It is scalable for different bandwidth/resolutionapplication. The detail design is presented from system to circuit level. Theprototype chip is fabricated in TSMC 0.25um process and measured on thetest bench. The measurement results show that a SNR over 60dB is obtainedwith a sampling frequency of 70 MHz and an OSR of ten.</p>
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Duda, Jakub. "Aspects of delta-convexity /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3115539.
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Barabucci, Gioele <1982>. "A universal delta model." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5761/.
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This thesis presents a universal model of documents and deltas. This model formalize what it means to find differences between documents and to shows a single shared formalization that can be used by any algorithm to describe the differences found between any kind of comparable documents.
The main scientific contribution of this thesis is a universal delta model that can be used to represent the changes found by an algorithm. The main part of this model are the formal definition of changes (the pieces of information that records that something has changed), operations (the definitions of the kind of change that happened) and deltas (coherent summaries of what has changed between two documents). The fundamental mechanism tha makes the universal delta model a very expressive tool is the use of encapsulation relations between changes. In the universal delta model, changes are not always simple records of what has changed, they can also be combined into more complex changes that reflects the detection of more meaningful modifications.
In addition to the main entities (i.e., changes, operations and deltas), the model describes and defines also documents and the concept of equivalence between documents. As a corollary to the model, there is also an extensible catalog of possible operations that algorithms can detect, used to create a common library of operations, and an UML serialization of the model, useful as a reference when implementing APIs that deal with deltas.
The universal delta model presented in this thesis acts as the formal groundwork upon which algorithm can be based and libraries can be implemented. It removes the need to recreate a new delta model and terminology whenever a new algorithm is devised. It also alleviates the problems that toolmakers have when adapting their software to new diff algorithms.
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Bernui, San Martín Tricia Alexandra, Laura Melloh Antonella Di, Seminario Ricardo Fernando Ferrand, Riofrio Marco Antonio Leonardo, and Sánchez Mary Krystel Miñano. "Caso Delta Signal Corporation." Master's thesis, Universidad del Pacífico, 2019. http://hdl.handle.net/11354/2531.
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Delta Signal es una compañía norteamericana dedicada a la producción y comercialización de autopartes eléctricas. Entre los años 2015 y 2018, Delta Signal decidió implementar la estrategia de excelencia operacional para lograr la eficiencia necesaria en la línea de ensamblaje y montaje. Para ello, la empresa asume como pilar el aprendizaje y crecimiento, a través de las estrategias Kaizen y JIT/Lean, elementos que le permitirán mantener y mejorar la calidad por la cual son reconocidos, haciendo cada vez más eficiente su proceso y mejorando los márgenes por autopartes producida. Con la aplicación de las iniciativas propuestas en el desarrollo de los planes funcionales de la empresa, se logra demostrar la viabilidad de la estrategia planteada, para el periodo comprendido entre los años 2019-2022. El presente trabajo está organizado en seis capítulos. El capítulo I describe el perfil competitivo de la empresa Delta Signal. En el capítulo II, se hace un análisis externo para el que se utiliza el Pestelg y las cinco fuerzas de Michael Porter. El capítulo III es sobre el diagnóstico interno de la organización para el que se utilizan una serie de herramientas como la cadena de valor, el mapa estratégico, el Balanced Scorecard y el análisis VRIO. Todo esto sirve para definir la ventaja competitiva y la estrategia genérica. El capítulo IV propone el planeamiento estratégico, donde se incluye la misión, visión, objetivos y estrategia competitiva. En el capítulo V, se elige la estrategia corporativa; y, finalmente, en el capítulo VI se describen los planes funcionales de la organización.
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Němec, Radek. "3D tiskárna typu Delta." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-400691.
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This master thesis is about design and construction of FDM delta 3D printer which consists of 32-bit electronics, magnetics printer head and other necessary peripheries. Opening chapters of this thesis are about theory of 3D printing and its methods with description of FDM 3D printers and summarization of FDM plastic materials used for 3D printing. The next part is about used electronics and problematic of heat transfer. The main part of this thesis describes design and construction of 3D printer and its necessary peripheries, which includes creation of its 3D model and application for 32bit controller. 3D model of delta 3D printer and its heating components was created in CAD software SolidWorks. The last part includes description of commissioning and calibration of delta 3D printer with summarization of economic aspects of its creation.
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Franke, Tobias Alexander. "The delta radiance field." Phd thesis, Technische Universität Darmstadt, 2015. http://tuprints.ulb.tu-darmstadt.de/4992/1/phd_thesis.pdf.
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The wide availability of mobile devices capable of computing high fidelity graphics in real-time has sparked a renewed interest in the development and research of Augmented Reality applications. Within the large spectrum of mixed real and virtual elements one specific area is dedicated to produce realistic augmentations with the aim of presenting virtual copies of real existing objects or soon to be produced products. Surprisingly though, the current state of this area leaves much to be desired: Augmenting objects in current systems are often presented without any reconstructed lighting whatsoever and therefore transfer an impression of being glued over a camera image rather than augmenting reality. In light of the advances in the movie industry, which has handled cases of mixed realities from one extreme end to another, it is a legitimate question to ask why such advances did not fully reflect onto Augmented Reality simulations as well.
Generally understood to be real-time applications which reconstruct the spatial relation of real world elements and virtual objects, Augmented Reality has to deal with several uncertainties. Among them, unknown illumination and real scene conditions are the most important. Any kind of reconstruction of real world properties in an ad-hoc manner must likewise be incorporated into an algorithm responsible for shading virtual objects and transferring virtual light to real surfaces in an ad-hoc fashion. The immersiveness of an Augmented Reality simulation is, next to its realism and accuracy, primarily dependent on its responsiveness. Any computation affecting the final image must be computed in real-time. This condition rules out many of the methods used for movie production.
The remaining real-time options face three problems: The shading of virtual surfaces under real natural illumination, the relighting of real surfaces according to the change in illumination due to the introduction of a new object into a scene, and the believable global interaction of real and virtual light. This dissertation presents contributions to answer the problems at hand.
Current state-of-the-art methods build on Differential Rendering techniques to fuse global illumination algorithms into AR environments. This simple approach has a computationally costly downside, which limits the options for believable light transfer even further. This dissertation explores new shading and relighting algorithms built on a mathematical foundation replacing Differential Rendering. The result not only presents a more efficient competitor to the current state-of-the-art in global illumination relighting, but also advances the field with the ability to simulate effects which have not been demonstrated by contemporary publications until now.
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Kwan, Terry Tai-Wing. "Corridor asynchronous delta modulation." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5932.
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Ottersbach, Dirk. "Dehydrierung n-substituierter Delta3-Piperideine /." [S.l. : s.n.], 1988. http://www.gbv.de/dms/bs/toc/025230328.pdf.
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Giaime, Matthieu. "Géoarchéologie des ports antiques en contextes deltaïques : quelques exemples de Méditerranée et de mer Noire." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM3091.
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Les deltas ont débuté leur édification il y a environ 7000 ans suite à la stabilisation du niveau de la mer. Ils offraient durant l’Antiquité une mosaïque d’environnements, plus ou moins protégés, favorables aux activités maritimes. Nous montrons que plusieurs types de ports deltaïques peuvent être identifiés en raison des différents contextes géomorphologiques offerts par les deltas. La mise en relation des résultats bio-sédimentologiques, avec les données archéologiques nous ont permis de détailler l’évolution des environnements portuaires de plusieurs sites antiques situés dans des deltas. La première étude a été menée à l’échelle du delta de la Kouban (Péninsule de Taman, Russie). Un carottage réalisé à l’extrémité orientale de la péninsule et sa comparaison avec d’autres études géoarchéologiques menées récemment dans le delta nous a permis de restituer l’évolution paléogéographique de la péninsule. Nous avons pu confirmer que cette dernière a constituée, suite à la remontée postglaciaire du niveau marin, un large archipel articulé autour de quatre îles. À Tel Akko (Baie de Haifa, Israël), notre étude nous a permis de restituer l’évolution côtière du site depuis l’Âge du Bronze. À Pollentia, cité romaine des Baléares, nous avons été en mesure de démontrer que le port était situé dans une lagune de faible profondeur située en marge distale d’un petit delta côtier. Enfin à Halmyris (Danube, Roumanie) nous avons été en mesure de démontrer que la forteresse romaine, installée sur un promontoire, était protégée des crues tout en bénéficiant d’un accès facilité au fleuve par l’intermédiaire d’un chenal secondaire au sein duquel son port aurait pu être installé<br>River deltas began forming around 7000 years BP because of the stabilisation of the mean sea-level. The natural variety of wetland environments on clastic coasts, in particular deltas, explains in major part the important disparities in harbour contexts. The combination of earth sciences with archaeological tools allows us to investigate the environmental evolution of four ancient sites located on deltas. We investigate 7000 years of environmental changes on the Kuban delta (Taman Peninsula, Russia). A coring, from the eastern limit of the peninsula, and its comparison with other geoarchaeological studies undertaken on the delta, allow us to confirm that the Holocene marine transgression created an archipelago of four islands around 6000 years ago in the area of the present-day Taman Peninsula. In Antiquity, natural factors such as delta progradation and the evolution of spits and sand bars have considerably affected the landscape evolution and therefore human occupation of the peninsula. At Tel Akko, (Haifa Bay, Israel), we reconstruct the evolution of the coastal zone of the site since the Bronze Age. We propose different harbour locations over time. At Pollentia, a Roman city of Mallorca, we have been able to demonstrate that the harbour was situated in a shallow lagoon, probably dredged at the time of its foundation. At Halymris (Danube delta, Romania), our research supports the presence of a secondary fluvial-channel located close to the fortress where the harbour may have been installed. The fortress, located at the foot of a promontory, was protected from floods and provided easy access to the main channel of the river
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Roy, Guylaine. "Développement de ribozymes delta contre l'unique ARNm du virus de l'hépatite delta humaine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0003/MQ40622.pdf.
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Ngala, Umar Jibrin. "4 D Delta Tectonics: Tectonic Evolution of the Deepwater South Central Niger Delta." Thesis, Royal Holloway, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498744.
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Diawuo, Kwasi. "Buried channel delta-doped metal-oxide semiconductor field effect transistors (#delta#-doped MOSFETs)." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361543.
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Roy, Guylaine. "Développement de ribozymes delta contre l'unique ARNm du virus de l'hépatite delta humaine." Sherbrooke : Université de Sherbrooke, 1998.
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Michelle), Greene Chana M. (Chana. "Search for pre-existing Delta states at BLAST from ²H(e,e'[Delta]⁺⁺." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36317.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.<br>Includes bibliographical references (leaf 25).<br>At the MIT-Bates Linear Accelerator Center a comprehensive study of low-Q2 spin-dependent electron scattering from deuterium has been carried out using the Bates Large Acceptance Spectrometer Toroid (BLAST). This experiment has employed an 850 MeV polarized electron beam from the MIT-Bates linear accelerator incident on an internal polarized deuterium target and the BLAST detector. Deuterium's simple composition is an important factor in understanding the structure of the inter-nucleon potential. The pion production region has a resonant structure and is a promising location to search for pre-existing delta particles in deuterium. While, theoretical calculations predict that delta resonant states account for anywhere from 0.25 to 3.60% of the nuclear wave function, more realistic predictions for deuterium range from 0.3 to 1.0%. This thesis presents the determination of the (e,e'++) event rate from deuterium, the first of many steps towards a complete study of delta resonant states.<br>y Chana M. Greene.<br>S.B.
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Arzel, Erwan. "Delta-carbolines et benzo-delta-carbolines : nouvelle voie d'accès via la métallation isomérisante." Rouen, 1999. http://www.theses.fr/1999ROUES082.
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La thèse décrit une nouvelle voie d'accès aux delta-carbolines par association des réactions de métallation et de couplage croisé catalysé par le palladium. Cette stratégie, totalement convergente et régiosélective, nécessite la synthèse de la 3-fluoro-2-iodopyridine et de l'acide 2-pivaloylaminophénylboronique. L'étude de la métallation isomérisante en série quinoléine a permis d'étendre la méthode à la préparation de benzo--carbolines et de cryptolépines substituées. Enfin, la préparation d'alcaloïdes plus complexes isolés de la Cryptolepis sanguinolenta a été abordée avec les premières synthèses totales de la cryptomisrine et de la 11-isopropylcryptolépine.
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Perca, Cristian. "Structure cristalline et magnétique de perovskites RBaMn2O6-delta (où delta=0 et 0,5)." Paris 11, 2005. https://tel.archives-ouvertes.fr/tel-00076575v2.
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Cette thèse porte sur la synthèse et l'étude des propriétés structurales et magnétiques de perovskites RBaMn2O6-d (où d = 0 et 0,5). En ce qui concerne le composé YBaMn2O6, les mesures par DSC indiquent que celui-ci subit trois transitions : deux autour de 500K et la troisième à 750K. L'étude par diffraction des rayons X et de neutrons a montré que la phase de plus haute température cristallisait dans le groupe P4/nbm. Les diffractogrammes de rayons X et de neutrons ne présentent qu'un seul changement alors que deux transitions sont observées par DSC au voisinage de 500K. La phase intermédiaire a été affinée dans le groupe d'espace C2/m. La phase d'ordre de charges (en dessous de 500K) étant de basse symétrie, nous avons réalisé un affinement combiné rayons X-neutrons. Les résultats obtenus indiquent un écart de seulement 15% par rapport à un ordre de charges idéal Mn3+/Mn4+. L'affinement de la structure magnétique et les mesures de susceptibilité magnétique indiquent la formation de polarons de Zener contenant quatre cations manganèse. Le composé YBaMn2O5,5 cristallise dans le groupe d'espace Icma, sa maille étant double de celle du composé au lanthane. Ceci est du à l'existence d'une rotation des octaèdres de la structure autour de la direction [001] dans le composé YBaMn2O5,5. L'affinement de la structure magnétique ainsi que les mesures de susceptibilité magnétique indiquent que les spins des cations Mn3+ présents dans la structure sont couplés de manière antiferromagnétique. L'étude des composés RBaMn2O6 nous a permis d'établir un diagramme de phases en fonction de la terre rare et de la température<br>In our study we have synthesised and studied the structural and magnetic structure of the perovskite RBaMn2O6-d (where d=0 and 0. 5). Concerning the compound YBaMn2O6, DSC measurements show that it undergoes three transitions: two around 500K and a third one at 750K. X-ray and neutron diffraction studies have shown that the high temperature phase crystallises in the space group P4/nbm. The X-ray and neutron diffraction patterns show only one structural transition whereas two endothermic peaks are observed in the DSC measurements around 500K. The intermediate phase structure was refined in the space group C2/m. The charge ordered phase (that below 500K) being characterised by a low symmetry, we have realised a combined X-ray/neutron diffraction refinement. The results which were obtained show a difference of only 15%, with respect to the ideal charge separation Mn3+/Mn4+. The refinement of the magnetic structure, and the magnetic susceptibility measurements indicate the formation of Zener polarons containing four manganese cations. The compound YBaMn2O5. 5 crystallises in the space group Icma, its cell being twice that of the lanthanum same compound. This is due to the existence, in the YBaMn2O5. 5 compound, of a rotation of the octahedra around the [001] direction. The refinement of the magnetic structure and the magnetic susceptibility measurements have shown that the magnetic moments of the Mn3+ cations present in the structure, are antiferromagnetically coupled
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Tiron, Laura. "Étude de la mobilité morphologique et de la dynamique hydro-sédimentaire du bras de St George dans le delta du Danube (Roumanie) depuis 150 ans." Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX10037.
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Blomberg, Karin. "Från inbjudan till uppföljning : kvinnors erfarenheter av att delta eller inte delta i cervixcancerscreening." Doctoral thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-26495.
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Population-based cervical cancer screening programs (PCCSPs) were introduced in Stockholm in the 1960s; today all women residents aged 23-60 are invited to a cost-free Pap smear at regular intervals. A shift in scientific knowledge has occurred, with clarification of the link between human papilloma virus (HPV) and cervical cancer (CC), and the introduction of HPV-vaccines for primary prevention of CC. While there is a large body of research on CC screening, fewer studies address screening experiences of women in different phases of life with different screening histories. The aim of this thesis was to explore how women reason about CC, its causes, prevention and participation in CC screening. Method: These studies were guided by the inductive approach interpretive description . Sub-study I is based on qualitative analysis of 12 telephone interviews and 86 fax messages sent to the screening organisation by women who actively chose not to participate in PCCSP. Sub-study II is based on longitudinal interview data from 30 women, who underwent medical follow-up of an abnormal Pap smear. Sub-studies III and IV are based on data from 30-year old women with varied screening background and experiences, derived from 9 face-to-face focus group discussions (FGD) (sub-studies III, IV) and 30 internet-based FGDs (sub-study IV). Results: Women s ways of conceptualizing health, illness, and risk for disease in general impacted on their decision-making about attending PCCSP. Matters related to sickness, including CC and its prevention, were generally described as distant and unprioritized by many women. The manner 30-year old women self-defined themselves in the transition between youth and adulthood appears to strongly influence their reasoning not only about PCCSP, but also about other forms of health maintenance and disease prevention. How women defined and conceptualized distinctions between, and roles and responsibilities of, the private and the public was also found to be central in explanations of decision-making, especially among women who actively chose not to take a Pap smear. Women described a wide range of factors which could motivate them to participate in PCCSP, related to all aspects of the program, from invitation through follow-up, and a need for different types and forms of information. Many suggestions were related to individualization of the PCCSP; a need to understand the relationship between HPV and CC also was addressed. We also found that medical follow-up of an abnormal Pap smear involved an experience of both having and being a body, which changed over time. The conceptualization of bodily boundaries appeared to change, e.g. through vaginal discharges and bleeding, as well as linkages to the bodies of women in their extended families through the generations. Conclusion: All facets of the PCCSP and social marketing were found to influence women s experiences of and decisions about screening attendance. Women s views of the PCCSP as a comprehensive system suggest a need for increased collaboration among the many professionals with direct and indirect involvement in the PCCSP. These studies suggest that coordination with and information about PCCSP is an important implication for when initiating HPV vaccination programs, as a means of aiding women in integration of different types of knowledge and information.