Dissertations / Theses on the topic 'Bend loss'
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Morgan, R. D. "Bend loss in monomode optical fibres." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/785.
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Jones, Steven Lee. "Single mode optical fibre bend loss modelling." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264454.
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Haran, Francis Martin. "Bend loss in buffered single-mode optical fibre." Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/768.
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Li, Ying. "Impact of Macrobend Loss on the Bandwidth of Standard and Bend-Optimized Multimode Fibers." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/193828.
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10 Gigabit Ethernet (GbE) demands faster optical sources to support high modulation rates. At the same time, the allowable margin in the 10 GbE link power budget is decreasing. This means that a 10 GbE system is unable to support as many tight bends, and it is more difficult to avoid the costly downtime that results when the allowable margin is exceeded. The recent introduction of bend-optimized (BO) multimode fiber (MMF) provides a clear solution. 850 nm vertical cavity surface emitting lasers (VCSELs) and MMFs have long been the most cost effective choice for short reach premise applications. As will be shown, the combination of BO-MMF with VCSELs is even more attractive.Historically, MMF systems operating at low bit rates of 10-100 Mbps used light-emitting diodes (LED) sources, which launch nearly equal power into every fibermode. This launch is approximated by the overfilled launch (OFL), which is still used to characterize the core diameter and numerical aperture of MMF. Unlike LEDs, VCSELs typically underfill the fiber core and are better represented by an encircled flux launch (EFL). Using OFL to evaluate a VCSEL-based MMF system could therefore produce inaccurate and misleading results. A recent study [1] characterized the macrobend loss of MMF with overfilled and restricted mode offset launch conditions. In this study, the MMFs performance with an EFL is evaluated, which is a more relevant launch condition for laser transmission. The impact of both launch conditions, OFL and EFL, on MMF performance is studied and compared.We characterize macrobend losses at small bend radii and their impact on thebandwidth for both standard 50/125 um MMF and a newly introduced BO-MMF.In addition, the 10 GbE link performance is also evaluated using the IEEE link model P802.3ae3.The simulation results illustrate that both macrobend loss and bandwidth are vital to the overall optical link performance. The 10 GbE link performance of the standard fiber deteriorates with macrobends, while the bend-optimized fiber is insensitive to the deployment conditions.
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Kowalski, Elizabeth J. (Elizabeth Joan). "Miter bend loss and higher order mode content measurements in overmoded millimeter-wave transmission lines." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62444.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 119-121).
High power applications require an accurate calculation of the losses on overmoded corrugated cylindrical transmission lines. Previous assessments of power loss on these lines have not considered beam polarization or higher order mode effects. This thesis will develop a theory of transmission that includes the effect of linearly polarized higher order modes on power loss in overmoded corrugated transmission line systems. This thesis derives the linearly polarized basis set of modes for corrugated cylindrical waveguides. These modes are used to quantify the loss in overmoded transmission line components, such as a gap in waveguide or a 900 miter bend. The dependence of the loss in the fundamental mode on the phase of higher order modes (HOMs) was investigated. In addition, the propagation of a multi-mode beam after the waveguide was quantified, and it was shown that if two modes with azimuthal (m) indices that differ by one propagate in the waveguide, the resultant centroid and the tilt angle of radiation at the guide end are related through a constant of the motion. These theoretical calculations are useful for high-power applications, such as the electron cyclotron heating in plasma fusion reactors. In addition, this thesis develops a low-power S-Parameter Response (SPR) technique to accurately measure the loss in ultra-low loss overmoded waveguide components. This technique is used to measure the loss of components manufactured to ITER (an experimental fusion reactor) specifications, operated at 170 GHz with a diameter of 63.5 mm and quarter-wavelength corrugations. The loss in a miter bend was found to be 0.022+0.08 dB. This measurement is in good agreement with theory, which predicts 0.027 dB loss per miter bend, and past measurements [18]. The SPR was used to measure the loss in a gap of waveguide and the results were in good agreement with the well-established theoretical loss due to gap, which demonstrates the accuracy of the SPR technique. For both of these measurements, a baseline analysis determined the effects of a small percentage (1-2%) of higher order modes in the system.
by Elizabeth J. Kowalski.
S.M.
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Birri, Anthony. "Investigation of the Combined Effects of Simultaneous Heating and Bending of Silica Optical Fiber." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523878305649017.
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Tomljenovic-Hanic, Snjezana, and snjezana@physics usyd edu au. "Propagation effects in optical waveguides, fibres and devices." The Australian National University. Research School of Physical Sciences and Engineering, 2003. http://thesis.anu.edu.au./public/adt-ANU20040921.104741.
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This thesis consist of a theoretical study of propagation effects in optical waveguides, fibres and photonic crystals, with some comparison with experiment.¶
Chapter 1 gives a brief introduction with the current view of optical components in photonic integrated circuits and issues related to the loss mechanism.¶
In Chapter 2 the characteristics of single-mode propagation and transient effects in practical square- and rectangular-core buried channel planar waveguides are quantified, assuming a cladding which is unbounded in one transverse dimension and bounded in the other. The wavelength cut-off condition for the fundamental mode is determined when the cladding index is asymmetric and composed of step-wise, uniform index regions.¶
In Chapter 3, the application of segmented reflection gratings in planar devices that can function as either a single- or two-wavelength add/drop filter is investigated and a numerical technique developed in Chapter 2 is applied to the waveguides with high extinction ratio. The role of the segmented gratings is analogous to that of a blazed grating, but they can provide a higher reflectivity level at the Bragg wavelength, eliminate back reflection into the fundamental mode and provide arbitrarily small channel spacing in the two-wavelength case.¶
Chapters 4 address the problem of bend loss in a single-mode slab waveguide. A new theoretical strategy for reducing bend loss is presented and compared to existing designs. The results obtained in this chapter are the basis for the following two chapters.¶
Chapter 5 deals with bend loss in single-mode buried channel waveguides and demonstrates that the new strategy can lead to significant bend loss reduction when compared to other strategies, and, conversely, can be used to enhance bend loss for a fixed bend radius for application to devices such as optical attenuators.¶
In Chapter 6, a novel design of a variable optical attenuator based on a bent channel waveguide is proposed, realized by applying a new strategy for bend loss control in a polymer buried channel waveguide.¶
Chapter 7 investigates effects of the additional rings in a single mode step-index fibre on bend loss. It is supported with the experimental results of Ron Bailey from Optical the Fibre Technology Centre, University in Sydney.¶
In Chapter 8, bend loss of a one-dimensional photonic crystal is quantified and compared to bend loss of a standard single-mode slab waveguide and a bend-resistant waveguide.¶
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hansel, chase. "MAPPING OF PRESSURE LOSSES THROUGH MICROCHANNELS WITH SWEEPING-BENDS OF VARIOUS ANGLE AND RADII." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3382.
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MEMS (Micro Electro Mechanical Systems) have received a great deal of attention in both the research and industrial sectors in recent decades. The broad MEMS category, microfluidics, the study of fluid flow through channels measured on the micrometer scale, plays an important role in devices such as compact heat exchangers, chemical and biological sensors, and lab-on-a-chip devices. Most of the research has been focused on how entire systems operate, both experimentally and through simulation. This paper strives, systematically, to map them through experimentation of the previous to untested realm of pressure loss through laminar square-profile sweeping-bend microchannels. Channels were fabricated in silicone and designed so a transducer could detect static pressure across a very specific length of channel with a desired bend. A wide variety of Reynolds numbers, bend radii, and bend angles were repeatedly tested over long periods in order to acquire a complete picture of pressure loss with in the domain of experimentation. Nearly all situations tested were adequately captured with the exception of some very low loss points that were too small to detect accurately. The bends were found to match laminar straight-duct theory at Reynolds numbers below 30. As Reynolds numbers increased, however, minor losses began to build and the total pressure loss across the bend rose above straight-duct predictions. A new loss coefficient equation was produced that properly predicted pressure losses for sweeping-bends at higher Reynolds numbers; while lower flow ranges are left to laminar flow loss for prediction.M.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering MSME
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Kunene, Thokozani Justin. "Determination of the head loss coefficient of closely spaced pipe bends." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2519.
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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.Space limitation in ships and the complex pipe layouts in chemical, mineral and food processing plants lead to the employment of closely spaced bends. The limited information regarding the head loss coefficient of pipe bends orientated as bend-spacer-bend has led pipeline designers to treat them as isolated bends with the same loss coefficient. Thus, to calculate the head loss in the piping system would simply involve summing the head loss coefficient of bends and neglecting their configuration. This practice causes inaccurate computation of head losses in the system. In this study a computational model is developed for the head loss coefficient of closely spaced pipe bends. This is then supported by experimental verification. A more accurate but still simple and easy to use empirical correlation is derived. The empirical correlation is established and the data presented under isothermal conditions for turbulent flows in a range 7.3x104 ≤ Re ≤ 5.8x105 and a spacing ratio of 1D ≤ L/d ≤ 10Dand curvature ratio of 3 ≤ rc/d ≤ 5. Using ANSYS® CFX® 11, a commercial computational fluid dynamics (CFD) package, the fluid domain representing two 900 smooth pipe bends separated by a short pipe was solved and the mechanisms causing the head loss coefficient were explored by using the CFD results to visualise the fluid flow structure/pattern. The computational model was validated by comparing the head loss coefficient of a single bend and the model was found to be sound. The experiments conducted in the built test facility using smooth pipes showed similarities in the trends between the CFD work and the published data and they were to be found have a similar trend. The experiment had shown results that agree to the findings from literature.
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Wong, Kevan. "Studies of the quality of the intraosseous dental implant bed and of thermal effects in implant pathology." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481679.
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Vellard, Jehan. "Los indios guarayos del Madre de Dios y del Beni." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/114122.
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Schramm, Volker [Verfasser], and Bernd [Akademischer Betreuer] Bertsche. "Dependable system development methodology and case study for the LHC beam loss monitoring system at CERN / Volker Schramm ; Betreuer: Bernd Bertsche." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2021. http://d-nb.info/1236898893/34.
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O'Brien, John P. "Tuberculosis contact tracing in Boston homeless shelters: estimating exposure risk using electronic bed logs." Thesis, Boston University, 2012. https://hdl.handle.net/2144/12546.
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Thesis (M.A.)--Boston UniversityPublic health departments struggle to maintain costs while sensitively targeting contacts of patients with infectious tuberculosis. The homeless populations in shelters have high degrees of contact exposure and are difficult to trace and treat. Once left untreated, a contact can continue the spread of tuberculosis and worsen a tuberculosis outbreak. It is important for public health workers to quickly identify all the at-risk contacts and to contain costs by specifically excluding any contacts with insignificant exposure. The Boston Public Health Commission utilizes electronic bed logs in the homeless shelters to measure the exposure duration and proximity. From this, it was desired to create a tier system in which a level of exposure could be linked to risk of tuberculosis infection. Two cases that occurred in 2006-2007 in Boston homeless shelters were studied. Electronic bed records were gathered for all nights when each index case stayed at their respective shelter. An exposure score was assigned as the sum of proximity-based ranks over the total number of nights within three beds of the index case. Priority risk groups were assigned from these scores. Tuberculin skin test (TST) converters had the highest mean (12.3, range 0.5-35) exposure score, followed by contacts with only a negative baseline TST (4.0, range 0.5-30). The lowest scores (2.0) were seen in the group with no TST results and in those with a documented prior positive TST. Among contacts with two appropriately timed TSTs, persons with exposure scores >10 had 24 times the odds of converting their TST compared to those with exposure scores <2. Increasing exposure scores were associated with increasing odds ratio of conversion (0.84, 4.80, and 24.0). Only exposure scores >10 were significantly associated with TST conversion. Our work suggests that an exposure score may provide a simple quantified estimate of the duration of exposure. Primitizing follow-up to those persons with higher exposure scores reduces the number of persons in whom testing is needed. Including the group of those with no TST information and those with only a negative baseline TST, targeting exposure scores of > 4.5 reduces the target group for whom testing was recommended by 77% (548 to 124), while maintaining high sensitivity for potential converters.
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Profe, Jörn [Verfasser], Bernd [Akademischer Betreuer] Zolitschka, Bernd [Gutachter] Zolitschka, and Markus [Gutachter] Fuchs. "X-ray fluorescence scanning of discrete samples - a new tool for the geochemical characterization of loess-paleosol sequences / Jörn Profe ; Gutachter: Bernd Zolitschka, Markus Fuchs ; Betreuer: Bernd Zolitschka." Bremen : Staats- und Universitätsbibliothek Bremen, 2018. http://d-nb.info/1165772167/34.
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McLean, Christopher Robert. "Pseudo proximate analysis: method using wireline logs to estimate components of coal bearing rock matrix without control data." University of the Western Cape, 2015. http://hdl.handle.net/11394/4333.
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>Magister Scientiae - MScLab conducted proximate analysis of coal bearing rock units calculates the weight percentage of ash, moisture, fixed carbon and volatile matter through a series of combustion steps. The data obtained is quintessential in establishing the coal rank and in the case of coal bed methane the gas-in-place estimates. In this study 105 proximate analysis samples, from 7 drilled wells, are taken from the south-eastern Kalahari Basin in Botswana. The pseudo proximate analysis, the method proposed in this thesis, calculates the lab proximate analysis results using the neutron, density and gamma ray wireline logs. The uniqueness of the method lies in the fact that no cut off values are needed for the wireline logs, nor are the results of the lab proximate analysis required for calibration. An in depth study of the relationship between the wireline logs and proximate analysis is conducted using a principle component analysis and the results tested using a combination of statistical techniques to determine the significance of the relationship. It is shown that the density and neutron logs model the proportion of ash and volatile matter in the rock matrix, respectively, with a high degree of accuracy. The multiple regression analysis shows that percentages fixed carbon and moisture components of the rock matrix correlate poorly to the proposed well logs, thus most error lies in the determination of these two components. It is statistically proven that the pseudo proximate analysis results are significantly different to the lab measured proximate analysis. This implies that the proposed pseudo proximate analysis method is unable to accurately determine the components of a coal bearing rock matrix using the density, neutron and gamma ray wireline logs. The application of the proposed method is a model to identity the coal bearing rock matrix and provide a predictive estimation of the coal quality, a priori lab measured data.
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Nimuno, Teumahji Achu. "The application of geophysical wireline logs for porosity and permeability characterisation of coal seams for coal bed methane evaluation : Waterberg Basin, South Africa." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/5104.
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>Magister Scientiae - MScThe fracture porosity and permeability of the Beaufort Seam 1 (BS1) and Ecca coal seams of the Waterberg Basin have been comprehensively characterised with the aid of geophysical wire‐line logs. The main aim of the thesis was to estimate the porosity and permeability of the coal seams using down‐hole wire‐line data; comparing results from injection falloff test to establish the validity of the technique as a fast an effective method. The study area is the largely under explored Karoo‐aged, fault bounded Waterberg basin Located in the Limpopo Province of South Africa. The study employed mainly the density and dual lateral resistivity logging data (Las format) from eight wells (WTB45, WTB48, WTB56, WTB58, WTB62, WTB65, WTB70 and WTB72). Density logging data was used for coal identification and fracture porosity estimation while fracture permeability was estimated from dual lateralog resistivity data. Analysis of fracture porosity required coal cementation indices and fracture width as an input parameter. These were estimated with the aid of water pump out test data, coal quality and gas analysis data provided by Anglo Coal in addition to the above mention logs. The collection of sheet coal model was used to represent anisotropic coal reservoirs with non‐uniform fracture system was used to represent these coals. The mathematical formulas used to estimate both fracture porosity and permeability took into account the above coal model. The theoretical formulas are a modification from both Darcy’s equation and Archie’s equations. The coal seams were encountered at depths ranging from 198m to 385m in the wells and were marked by low density and very high resistivity. From the estimated results the coal reservoirs are characterised by high cementation indices ranging from 0.82 to 2.42, very low fracture porosity and low fracture permeability. Estimated results show that coal reservoir fracture porosity ranged from 0.0002% to 0.33% for both BS1 and Ecca seams. Estimated results also show that coal reservoir permeability ranged from 0.0045mD to 6.05mD in the BS1 formation and from 0.01 to 0.107mD in the Ecca. Results when compared with those of injection falloff test shows that the estimated permeability is slightly lower as expected since the model did not account for coal anisopropy. The fracture permeability was found to decrease with increase in vitrinite content, coal rank, coal burial depth and increases with increase in inertinite content. On a basinal scale the model estimated permeability was found to increase slightly from the east to the west of the basin. The porosity decreases with increase cementation index for deeper coal seams and increases with increase cementation index for shallower coal seams.
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Roth, Friedrich [Verfasser], Martin [Akademischer Betreuer] Knupfer, and Bernd [Akademischer Betreuer] Büchner. "Electronic structure of selected aromatic hydrocarbon systems investigated with electron energy-loss spectroscopy / Friedrich Roth. Gutachter: Bernd Büchner ; Martin Knupfer. Betreuer: Martin Knupfer." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://d-nb.info/1068151641/34.
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Loos, Irene C. T. [Verfasser], and Bernd F. [Akademischer Betreuer] Straub. "Synthese von 1,4-disubstituierten 1,2,3-Triazolen und ihre Anwendung als Liganden / Irene C. T. Loos ; Betreuer: Bernd F. Straub." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177040867/34.
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Wolter, Steffen [Verfasser], and Jan [Akademischer Betreuer] Benda. "Loss of function mutation of the receptor guanylyl cyclase B (GC-B) leads to changes in features of auditory processing / Steffen Wolter ; Betreuer: Jan Benda." Tübingen : Universitätsbibliothek Tübingen, 2019. http://d-nb.info/1197611037/34.
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Bazan, Ravines Mauricio Javier, and Vargas Jorge Daniel Coronado. "Control de erosión fluvial en la curva externa, haciendo uso de paletas sumergidas en los sectores La Perla-Florida y Cantagallo en el Rio Rímac aplicando modelamiento numérico." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654947.
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La presente tesis tiene como objetivo evaluar una propuesta para el control de erosión fluvial de la curva externa del rio Rimác ubicada entre los sectores Cantagallo y La Perla en Chosica, verificando su eficacia a través de un modelamiento con fines de calcular la socavación producida para diferentes periodos de retorno y proponer como estructura de control a las paletas sumergidas, comparando ambos resultados obtenidos para evaluar sus beneficios.
El tramo escogido presentó fallas en los muros de contención ubicados a lo largo del cauce según un estudio previo realizado por el INGEMMET, por lo que es necesario mejorar la infraestructura ya construida, por lo que la presencia de las paletas sumergidas podría actuar como tal. Por este motivo, el modelamiento hidráulico, realizado en el software Iber, nos permitirá conocer el comportamiento del río para obtener las variables de diseño y conocer los valores de velocidades y esfuerzos cortantes de fondo producidos en la curva externa.
Se realizó la simulación para dos escenarios, uno considerando las máximas avenidas producidas en años previos y el segundo despreciando dichos valores. Esto nos permite comparar las dimensiones y comportamiento de ambas estructuras para un futuro diseño.
Finalmente, en ambos escenarios se verificó que la presencia de las paletas sumergidas en la curva externa reduce los niveles de erosión local y general producido para los diferentes caudales simulados, por lo que resulta una estructura viable a ser aplicada como medida de control.The objective of this thesis is to evaluate a proposal for the control of fluvial erosion of the external bend of the Rimac river located between the Cantagallo and La Perla sectors in Chosica, verifying its effectiveness through a modeling in order to calculate the undercut produced for different return periods and propose submerged vanes as a control structure, comparing both results obtained to evaluate their benefits. The chosen section presented failures in the retaining walls located along the channel according to a previous study carried out by INGEMMET, so it is necessary to improve the infrastructure already built, so the presence of the submerged vanes could act as such. For this reason, the hydraulic modeling, carried out in the Iber software, will allow us to know the behavior of the river to obtain the design variables and to know the values of speeds and shear stresses produced in the external bend. The simulation was performed for two scenarios, one considering the maximum avenues produced in previous years and the second disregarding these values. This allows us to compare the dimensions and behavior of both structures for a future design. Finally, in both scenarios it was verified that the presence of the submerged vanes in the external curve reduces the levels of local and general scour produced for the different simulated flows, making it a viable structure to be applied as a control measure.
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Abadia, Balarin Danka, and Medina Diana Luz Vásquez. "Criterios que garantizan la sostenibilidad ambiental de los alojamientos tipo Bed & Breakfast (B&B)." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/656989.
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Ante los drásticos impactos medioambientales, que han sido visibles durante los últimos años, muchas personas han optado por incorporar en sus vidas ciertos productos y servicios que permiten que la contaminación sonora y ambiental no siga en aumento. Debido a ello, se hace evidente que existe una tendencia por hacer uso de productos y servicios que vayan de la mano con la sostenibilidad ambiental. Hoy en día, el consumo de plástico ha disminuido en un 30% en comparación al año 2019. Muchas personas utilizan sorbetes biodegradables, bolsas hechas con productos reciclados, entre otros productos. Así como se han incorporado productos ecoamigables, el sector hotelero, se ha sumado también brindando ciertos productos y servicios sostenibles a sus clientes. Sin embargo, los tipos de hoteles más reconocidos por ser alojamientos sostenibles son los ecolodges, ya que cumplen con la mayoría de criterios de sostenibilidad. Por este motivo, la presente investigación analiza de forma académica, los elementos que se deben considerar para garantizar la sostenibilidad ambiental de los alojamientos tipo Bed & Breakfast. Se utilizó como metodología la revisión bibliográfica de fuentes académicas de sostenibilidad sobre los elementos que deben ser incorporados en los hoteles para que se consideren sostenibles ambientalmente y poder dar a conocer si es beneficioso o no la aplicación de los elementos sostenibles medioambientalmente en el caso de los alojamientos tipo Bed & Breakfast.Faced with the drastic environmental impacts, which have been visible in recent years, many people have chosen to incorporate certain products and services into their lives that allow noise and environmental pollution to not continue to increase. Due to this, it is evident that there is a tendency to make use of products and services that go hand in hand with environmental sustainability. Today, plastic consumption has decreased by 30% compared to 2019. Many people use biodegradable straws, bags made with recycled products, among other products. Just as eco-friendly products have been incorporated, the hotel sector has also joined by providing certain sustainable products and services to its customers. However, the types of hotels most recognized for being sustainable accommodations are ecolodges, since they meet most sustainability criteria. For this reason, this research analyzes in an academic way, the elements that must be considered to guarantee the environmental sustainability of Bed & Breakfast type accommodations. The methodology used was a bibliographic review of academic sustainability sources on the elements that must be incorporated in hotels to be considered environmentally sustainable and to be able to make known whether or not the application of environmentally sustainable elements is beneficial in the case of hotels Bed & Breakfast type accommodations.
Trabajo de investigación
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Granello, Carmella A. "The use of the birthing bed versus the delivery table and the relationship to mother's blood loss, perineal trauma, and the infant's neurobehavioral response /." Staten Island, N.Y. : [s.n.], 1989. http://library.wagner.edu/theses/nursing/1989/thesis_nur_1989_grane_use.pdf.
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König, Andreas [Verfasser], Martin [Akademischer Betreuer] Knupfer, Bernd [Akademischer Betreuer] Büchner, and Wezel Jasper [Akademischer Betreuer] van. "Charge-Density Waves and Collective Dynamics in the Transition-Metal Dichalcogenides: An Electron Energy-Loss Study / Andreas König. Gutachter: Bernd Büchner ; Jasper van Wezel. Betreuer: Martin Knupfer." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://d-nb.info/1068154365/34.
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Groves, Christopher. "Lithologic Controls on Karst Groundwater Flow, Lost River Groundwater Basin, Warren County, Kentucky." TopSCHOLAR®, 1987. http://digitalcommons.wku.edu/theses/1554.
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The Lost River Groundwater Drainage Basin in Warren County, Kentucky, is a karst drainage system encompassing 55 square miles (143 square kilometers) developed within the Mississippian St. Louis and Ste. Genevieve Limestones. Near the contact between these two formations are two bedded chert units, the Lost River Chert Bed (Elrod, 1899) within the Ste. Genevieve and the Corydon Chert Member (Woodson, 1983) of the St. Louis, which appear to be perching layers to shallow karst groundwater flow. Groundwater may be seen flowing on top of these beds in various cave streams and at swallets and springs throughout the basin.
In order to compare the vertical positions of these layers to shallow karst groundwater flow, geologic structure maps of the Lost River Chert Bed and the Corydon Chert Member were prepared for the basin, along with a contour map of the water table (at or near which shallow karst groundwater flow is assumed to take place) over the same area. These surfaces were digitized, then contoured and compared using SURFACE II and DISSPLA computer graphics systems. Correlation was accepted for points where the water table is either 20 feet (6.1 meters above or below the top of the two chert layers. The water table (at baseflow conditions) was found to correlate with the Lost River Chert Bed over 42.6% of the basin, as well as 40.7% for the Corydon Member. Shallow karst groundwater flow is found to correlated with bedded chert layers over 83.3% of the study area, and therefore it is concluded that chert layers have a dominant effect on the vertical position of groundwater flow within the Lost River Groundwater Drainage Basin.
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Voráč, Petr. "Návrh a optimalizace fluidního roštu z hlediska funkčnosti a ekonomiky výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228942.
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The Master´s thesis deals with the fluid layer, with types of fluidized layer and with problems which can be solve during design of new fluidized beds. The aim was find the fluidized grid, which is the best form economical and technological point of view. In this work are compared three fluidized grids. The first was part of submission. Next two additional types were then proposed by the author of thesis. Proposals grids are discussed in detail from the design phase, through the modeling and subsequent simulation part in a computer program. The results of simulation are pressure losses. Which are compared with the recommended interval values. Afterward these tested beds are put through technical and economic analysis. The result is grade which is met both requirements.
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Aalto, Rolf Erhart. "Geomorphic form and process of sediment flux within an active orogen : denudation of the Bolivian Andes and sediment conveyance across the Beni Foreland /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/6718.
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Filatoff, Nicolas. "Rheologie d'un lit de particules : equations generales et lois de comportement." Paris 6, 1988. http://www.theses.fr/1988PA066678.
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Masoudi, Pedram. "Application of hybrid uncertainty-clustering approach in pre-processing well-logs." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S023/document.
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La thèse est principalement centrée sur l'étude de la résolution verticale des diagraphies. On outre, l'arithmétique floue est appliquée aux modèles expérimentaux pétrophysiques en vue de transmettre l'incertitude des données d'entrée aux données de sortie, ici la saturation irréductible en eau et la perméabilité. Les diagraphies sont des signaux digitaux dont les données sont des mesures volumétriques. Le mécanisme d'enregistrement de ces données est modélisé par des fonctions d'appartenance floues. On a montré que la Résolution Verticale de la Fonction d'Appartenance (VRmf) est supérieur d'espacement. Dans l'étape suivante, la fréquence de Nyquist est revue en fonction du mécanisme volumétrique de diagraphie ; de ce fait, la fréquence volumétrique de Nyquist est proposée afin d'analyser la précision des diagraphies. Basé sur le modèle de résolution verticale développée, un simulateur géométrique est conçu pour générer les registres synthétiques d'une seule couche mince. Le simulateur nous permet d'analyser la sensibilité des diagraphies en présence d'une couche mince. Les relations de régression entre les registres idéaux (données d'entrée de ce simulateur) et les registres synthétiques (données de sortie de ce simulateur) sont utilisées comme relations de déconvolution en vue d'enlever l'effet des épaules de couche d'une couche mince sur les diagraphies GR, RHOB et NPHI. Les relations de déconvolution ont bien été appliquées aux diagraphies pour caractériser les couches minces. Par exemple, pour caractériser une couche mince poreuse, on a eu recours aux données de carottage qui étaient disponibles pour la vérification : NPHI mesuré (3.8%) a été remplacé (corrigé) par 11.7%. NPHI corrigé semble être plus précis que NPHI mesuré, car la diagraphie a une valeur plus grande que la porosité de carottage (8.4%). Il convient de rappeler que la porosité totale (NPHI) ne doit pas être inférieure à la porosité effective (carottage). En plus, l'épaisseur de la couche mince a été estimée à 13±7.5 cm, compatible avec l'épaisseur de la couche mince dans la boite de carottage (<25 cm). Normalement, l'épaisseur in situ est inférieure à l'épaisseur de la boite de carottage, parce que les carottes obtenues ne sont plus soumises à la pression lithostatique, et s'érodent à la surface du sol. La DST est appliquée aux diagraphies, et l'intervalle d'incertitude de DST est construit. Tandis que la VRmf des diagraphies GR, RHOB, NPHI et DT est ~60 cm, la VRmf de l'intervalle d'incertitude est ~15 cm. Or, on a perdu l'incertitude de la valeur de diagraphie, alors que la VRmf est devenue plus précise. Les diagraphies ont été ensuite corrigées entre l'intervalle d'incertitude de DST avec quatre simulateurs. Les hautes fréquences sont amplifiées dans les diagraphies corrigées, et l'effet des épaules de couche est réduit. La méthode proposée est vérifiée dans les cas synthétiques, la boite de carottage et la porosité de carotte. L'analyse de partitionnement est appliquée aux diagraphies NPHI, RHOB et DT en vue de trouver l'intervalle d'incertitude, basé sur les grappes. Puis, le NPHI est calibré par la porosité de carottes dans chaque grappe. Le √MSE de NPHI calibré est plus bas par rapport aux cinq modèles conventionnels d'estimation de la porosité (au minimum 33% d'amélioration du √MSE). Le √MSE de généralisation de la méthode proposée entre les puits voisins est augmenté de 42%. L'intervalle d'incertitude de la porosité est exprimé par les nombres flous. L'arithmétique floue est ensuite appliquée dans le but de calculer les nombres flous de la saturation irréductible en eau et de la perméabilité. Le nombre flou de la saturation irréductible en eau apporte de meilleurs résultats en termes de moindre sous-estimation par rapport à l'estimation nette. Il est constaté que lorsque les intervalles de grappes de porosité ne sont pas compatibles avec la porosité de carotte, les nombres flous de la perméabilité ne sont pas valablesIn the subsurface geology, characterization of geological beds by well-logs is an uncertain task. The thesis mainly concerns studying vertical resolution of well-logs (question 1). In the second stage, fuzzy arithmetic is applied to experimental petrophysical relations to project the uncertainty range of the inputs to the outputs, here irreducible water saturation and permeability (question 2). Regarding the first question, the logging mechanism is modelled by fuzzy membership functions. Vertical resolution of membership function (VRmf) is larger than spacing and sampling rate. Due to volumetric mechanism of logging, volumetric Nyquist frequency is proposed. Developing a geometric simulator for generating synthetic-logs of a single thin-bed enabled us analysing sensitivity of the well-logs to the presence of a thin-bed. Regression-based relations between ideal-logs (simulator inputs) and synthetic-logs (simulator outputs) are used as deconvolution relations for removing shoulder-bed effect of thin-beds from GR, RHOB and NPHI well-logs. NPHI deconvolution relation is applied to a real case where the core porosity of a thin-bed is 8.4%. The NPHI well-log is 3.8%, and the deconvolved NPHI is 11.7%. Since it is not reasonable that the core porosity (effective porosity) be higher than the NPHI (total porosity), the deconvolved NPHI is more accurate than the NPHI well-log. It reveals that the shoulder-bed effect is reduced in this case. The thickness of the same thin-bed was also estimated to be 13±7.5 cm, which is compatible with the thickness of the thin-bed in the core box (<25 cm). Usually, in situ thickness is less than the thickness of the core boxes, since at the earth surface, there is no overburden pressure, also the cores are weathered. Dempster-Shafer Theory (DST) was used to create well-log uncertainty range. While the VRmf of the well-logs is more than 60 cm, the VRmf of the belief and plausibility functions (boundaries of the uncertainty range) would be about 15 cm. So, the VRmf is improved, while the certainty of the well-log value is lost. In comparison with geometric method, DST-based algorithm resulted in a smaller uncertainty range of GR, RHOB and NPHI logs by 100%, 71% and 66%, respectively. In the next step, cluster analysis is applied to NPHI, RHOB and DT for the purpose of providing cluster-based uncertainty range. Then, NPHI is calibrated by core porosity value in each cluster, showing low √MSE compared to the five conventional porosity estimation models (at least 33% of improvement in √MSE). Then, fuzzy arithmetic is applied to calculate fuzzy numbers of irreducible water saturation and permeability. Fuzzy number of irreducible water saturation provides better (less overestimation) results than the crisp estimation. It is found that when the cluster interval of porosity is not compatible with the core porosity, the permeability fuzzy numbers are not valid, e.g. in well#4. Finally, in the possibilistic approach (the fuzzy theory), by calibrating α-cut, the right uncertainty interval could be achieved, concerning the scale of the study
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Bouquet, Eric. "Etude de cycles calcination/carbonatation lors de la capture de CO2 en lit fluidisé circulant." Thesis, Mulhouse, 2009. http://www.theses.fr/2009MULH2226.
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Les travaux menés dans cette Thèse ont consisté à développer un pilote expérimental prouvant la faisabilité de la capture de CO2 par boucle chimique calcium en utilisant des chaudières du type Lit Fluidisé Circulant. Ceux-ci ont été conduits en deux phases: une phase expérimentale à l'échelle du laboratoire avec l'interprétation théorique des résultats et une phase expérimentale à l'échelle du pilote dans le but de valider le procédé. Les résultats expérimentaux à 1'échelle du laboratoire ont permis de montrer que le frittage de CaOest la cause de la décroissance du taux de carbonatation au cours des cycles successifs calcination/carbonatation. La vitesse de frittage étant accélérée par la présence de CO2 pendant la phase de calcination. Les analyses menées sur les échantillons calcinés ont révélé l'apparition d'une structure de micrograin à l'intérieur des grains initiaux de carbonate. Les micrograins de CaO non frittés sont le siège de la réaction de carbonatation.Un procédé de capture de CO2 par boucle chimique calcium a été conçu et réalisé. Il se compose de deux lits fluidisés circulants, un réacteur de carbonatation assurant la capture du CO2 et un réacteur de calcination permettant la régénération de la chaux. Ces deux lits fluidisés circulants sont couplés de façon à permettre un fonctionnement continu du procédé de capture de CO2. Malgré le faible rendement de capture obtenu à l'échelle de ce pilote (entre 18 à 23%), ces résultats apparaissent encourageants pour le développement de cette technologie, compte tenu du fait que beaucoup de facteurs limitant le rendement de capture disparaissent avec le changement d'échelleThe works led in this Thesis consisted in developing an experimental pilot proving CO2 capture feasibility by calcium chemical looping using Circulating Fluidised Bed as boilers. These were undertaken in two step: At the laboratory scale with theoretical interpretation of the experimental results and at the pilot scale in the aim to validate the process.The experimental results on the scale of the laboratory allowed to show that the sintering of CaO bring about the decreasing of the carbonation rate during calcination/carbonation cycles. The sintering velocity are accelerated by CO2 during the calcinations step. The analysis of the calcined samples showed a micrograins structure inside the initial carbonate grains The not sintered CaO micrograins are the location of the carbonation reaction.A process of CO2 capture by calcium chemical looping was designed and built. It was made by two circulating fluidized beds, a carbonator where the CO2 capture were performed and the calcinator allowing the lime regeneration. These two circulating fluidized beds are coupled allowing a continuous CO2 capture.In spite of the low capture efficiency obtained on the scale of this pilot (from 18 to 23 %), these results seem encouraging for the development of this technology, considering the fact that many limiting factors of the capture efficiency disappear with the change of scale
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Clavier, Rémi. "Étude expérimentale et modélisation des pertes de pression lors du renoyage d’un lit de débris." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0124/document.
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Ce travail de thèse porte sur l’étude des pertes de pression pour des écoulements monophasiques et diphasiques inertiels au travers de milieux poreux. Son objectif est d’aider à la compréhension et à la modélisation des transferts de quantité de mouvement à l’intérieur de lits de particules, en lien avec la problématique de la gestion d’un accident grave dans un réacteur nucléaire. En effet, lors d’un tel accident, la dégradation du coeur du réacteur peut amener celui-ci à s’effondrer pour former un lit de débris, que l’on peut assimiler à un milieu poreux à haute température et dégageant de la chaleur. Ce travail de thèse s’inscrit dans un projet de recherche en sûreté nucléaire visant à prédire la refroidissabilité d’un lit de débris par injection d’eau, ou « renoyage ». Une étude expérimentale des pertes de pression pour des écoulements monodimensionnels monophasiques et diphasiques à froid est proposée dans des situations représentatives du cas réacteur, en termes de granulométrie, de formes de particules et de vitesses d’écoulement. Les expériences réalisées apportent un complément important aux données existantes, en permettant notamment d’explorer les domaines d’écoulements diphasiques avec nombres de Reynolds liquides non nuls, tout en mesurant le taux de vide, ce qui est essentiel pour une modélisation. Des modèles prédictifs pour les pertes de pression à l’intérieur d’écoulements monophasiques et diphasiques au travers de lits de particules sont établis à partir des structures d’équations obtenues par une prise de moyenne volumique des équations de conservation locales. L’observation des écoulements monophasiques montrent que des lois de type Darcy-Forchheimer avec une correction quadratique en vitesse de filtration sont à même de prédire les pertes de pression avec une précision supérieure à 10%. Une étude numérique a montré que ce résultat est applicable pour un lit désordonné de particules peu rugueuses. L’étude des écoulements diphasiques montre qu’une structure d’équations de type Darcy-Forchheimer généralisée, incluant des termes supplémentaires pour prendre en compte les effets inertiels et les frottements interfaciaux, permet de reproduire le comportement des pertes de pression dans cette situation. Un nouveau modèle est proposé, et comparé aux données expérimentales et aux modèles utilisés dans les codes de simulation des accidents gravesThis work deals with single and two-phase flow pressure losses in porous media. The aim is to improve understanding and modeling of momentum transfer inside particle beds, in relation with nuclear safety issues concerning the reflooding of debris beds during severe nuclear accidents. Indeed, the degradation of the core during such accidents can lead to the collapse of the fuel assemblies, and to the formation of a debris bed, which can be described as a hot porous medium. This thesis is included in a nuclear safety research project on coolability of debris beds during reflooding sequences. An experimental study of single and two-phase cold-flow pressure losses in particle beds is proposed. The geometrical characteristics of the debris and the hydrodynamic conditions are representative of the real case, in terms of granulometry, particle shapes, and flow velocities. The new data constitute an important contribution. In particular, they contain pressure losses and void fraction measurements in two-phase air-water flows with non-zero liquid Reynolds numbers, which did not exist before. Predictive models for pressure losses in single and two-phase flow through particle beds have been established from experimental data. Their structures are based on macroscopic equations obtained from the volume averaging of local conservation equations. Single-phase flow pressure losses can be described by a Darcy-Forchheimer law with a quadratic correction, in terms of filtration velocity, with a better-than-10 % precision. Numerical study of single-phase flows through porous media shows that this correlation is valid for disordered smooth particle beds. Twophase flow pressure losses are described using a generalized Darcy-Forchheimer structure, involving inertial and cross flow terms. A new model is proposed and compared to the experimental data and to the usual models used in severe accident simulation codes
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Quispe, Díaz Jorge Manuel. "El reforzamiento de la etnicidad shipibo-konibo de las niñas y los niños de la comunidad Bena Jema por influencia de la educación intercultural bilingüe." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/13101.
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Esta investigación se enfoca en la primera escuela intercultural bilingüe urbana del Perú fuera de territorio indígena, en la comunidad shipibo-konibo Bena Jema de Tingo María, la cual es unidocente y multigrado. Interesa estudiar cómo la etnicidad, sus formaciones y sus reconocimientos, juegan un papel central en la socialización de los niños y las niñas. Se comprende la etnicidad a partir de la enseñanza recibida y de la cotidianidad escolar, las prácticas dentro de la comunidad y las interacciones entre influencias culturales diversas en el entorno urbano. Al ser un estudio cualitativo, se analizan cómo y en qué dimensiones la educación intercultural bilingüe (EIB) refuerza la formación como shipibos de las niñas y los niños. La información recogida en campo, aplicando normas éticas del trabajo antropológico, se presenta en capítulos que, a su vez, se desagregan en varios ítems para poder analizar detalladamente las evidencias, aunque en la cotidianidad, los conocimientos y las prácticas se expresan en conjunto, interrelacionadas. Se finaliza con la demostración de la hipótesis, que la adaptación que el docente ofrece de la Educación Intercultural
Bilingüe, desde la escolaridad primaria, refuerza la etnicidad de las niñas y los niños de la comunidadTesis
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Asthana, Abhishek. "Modélisation mathématique de la formation des NOx et de la volatilisation des métaux lourds lors de l'incinération sur grille d'ordures ménagères." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL018N/document.
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Dans une optique de maîtrise du procédé d’incinération des ordures ménagères et de ses possibles émissions polluantes, nous avons développé un modèle mathématique qui simule un lit d’ordures ménagères en combustion sur une grille mobile. Ce modèle décrit la plupart des phénomènes physicochimiques et thermiques intervenant lors de l’incinération : séchage et pyrolyse de la charge, combustion et gazéification du carbone résiduel, transferts thermiques, effondrement du lit, brassage… Il intègre également une description des mécanismes de volatilisation des métaux lourds et de formation des NOx. La cinétique de départ des métaux lourds est modélisée en tenant compte des différentes étapes de transport (transfert externe, diffusion intraparticulaire, volatilisation) au moyen de l’approche des temps caractéristiques additifs. Dans le cas simulé du cadmium, la prédiction d’une volatilisation quasi-complète est conforme aux résultats de la littérature. Le sous-modèle NOx prend en compte les mécanismes de formation thermique, prompt, combustible, par l’intermédiaire de N2O, ainsi que les mécanismes de réduction homogène par recombustion et hétérogène par le carbone résiduel. Les calculs révèlent que prédominent la formation par le mécanisme combustible et la destruction par la réduction hétérogène. Enfin, le modèle de lit a été utilisé pour étudier l’influence des divers paramètres opératoires : température, débit et distribution d’air primaire, taille des particules de déchets, brassage et schéma de brassage. Les résultats sont présentés et discutés en détail. L’influence des conditions opératoires sur l’efficacité du procédé et sur les émissions de Cd et NOx est analyséeAs a tool for controlling the Municipal Solid Waste (MSW) incineration process and its possible pollutant emissions, a mathematical model of the MSW bed burning on travelling grate of an incinerator was developed. The model describes most of the physico-chemical and thermal phenomena taking place in incineration like the drying and pyrolysis of the feed, combustion and gasification of char, oxidation of pyrolysis gases, heat transfer, bed shrinking, feed stirring, etc. Also described in the model are the mechanisms of Heavy Metals (HM) volatilization and NOx formation. Kinetics of HM release was modelled using the approach of additive reaction times accounting for the various transport mechanisms involved: external transfer, intra-particle diffusion and actual volatilization. In the case simulated, i.e. of Cd, almost total volatilization is predicted, which is confirmed by literature findings. The NOx sub-model takes into account most of the common mechanisms of formation like thermal, prompt, fuel, N2O intermediate and also NOx reduction by homogeneous reburning and heterogeneous reduction by char. Calculations show that NOx formation is predominated by the fuel mechanism and destruction by the heterogeneous reduction. Finally, the bed model was applied to study the influence of various operating parameters like flow rate, temperature and distribution of air under grates, waste particle size, feed stirring and the stirring scheme. The results are presented and discussed in detail and the influence of operating conditions on process efficiency and on emissions of Cd and NOx is analyzed
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DeBrosse, Jim. ""Lost in the Master's Mansion": How the Mainstream Media Have Marginalized Alternative Theories of the JFK Assassination." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1406818924.
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Dissy-Dissy, Yves Romuald. "Littérature et médiation dans "L'enfant de sable" et "La nuit sacrée" de Tahar Ben Jelloun, "La virgen de los sicarios" de Fernando Vallejo et "Le cavalier et son ombre" de Boubacar Boris Diop." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00838085.
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Cette thèse propose un discours théorique sur la médiation fictionnelle, notamment dans les romans de notre corpus. Dans une perspective rhétorique, la recherche consiste à étudier le processus de mise en œuvre de la signification dans les œuvres littéraires. La communication y apparaît non pas comme une donnée stable et simple que l'on pourrait réduire à des manifestations formelles ou encore à des contenus sociohistoriques, mais comme un ensemble d'exigences cohérent qui définissent les termes, sinon les modalités d'une coopération entre l'écrivain et le lecteur. La réflexion s'organise en trois parties.La première partie consiste à identifier la question dont l'énoncé romanesque est la réponse. Elle permet d'arborer, sous forme de thème, les grands axes de l'argumentation narrative, partant les enjeux de la communication dans chaque roman.Dans la seconde partie, il s'agit d'analyser les choix formels de l'énoncé et de montrer sur quels modes et à quelle fin idéologique la contribution du lecteur est sollicitée. En fait, c'est la stratégie discursive qui définit la modalité de communication et caractérise le régime de fonctionnement de la médiation dans une œuvre littéraire.L'idée centrale de la troisième partie consiste à montrer la compétence épistémologique qu'un écrivain confère à l'œuvre littéraire et la capacité du lecteur à l'identifier. Les théories qui deviennent des viviers épistémologiques de la littérature apparaissent comme des réductionnismes et de véritables obstacles au plaisir de lire ou de faire résonner avec justesse la signification d'une œuvre d'art.
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Dissy, Dissy Yves Romuald. "Littérature et médiation dans "L’enfant de sable" et "La nuit sacrée" de Tahar Ben Jelloun, "La virgen de los sicarios" de Fernando Vallejo et "Le cavalier et son ombre" de Boubacar Boris Diop." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST0009/document.
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Cette thèse propose un discours théorique sur la médiation fictionnelle, notamment dans les romans de notre corpus. Dans une perspective rhétorique, la recherche consiste à étudier le processus de mise en œuvre de la signification dans les œuvres littéraires. La communication y apparaît non pas comme une donnée stable et simple que l’on pourrait réduire à des manifestations formelles ou encore à des contenus sociohistoriques, mais comme un ensemble d’exigences cohérent qui définissent les termes, sinon les modalités d’une coopération entre l’écrivain et le lecteur. La réflexion s’organise en trois parties.La première partie consiste à identifier la question dont l’énoncé romanesque est la réponse. Elle permet d’arborer, sous forme de thème, les grands axes de l’argumentation narrative, partant les enjeux de la communication dans chaque roman.Dans la seconde partie, il s’agit d’analyser les choix formels de l’énoncé et de montrer sur quels modes et à quelle fin idéologique la contribution du lecteur est sollicitée. En fait, c’est la stratégie discursive qui définit la modalité de communication et caractérise le régime de fonctionnement de la médiation dans une œuvre littéraire.L’idée centrale de la troisième partie consiste à montrer la compétence épistémologique qu’un écrivain confère à l’œuvre littéraire et la capacité du lecteur à l’identifier. Les théories qui deviennent des viviers épistémologiques de la littérature apparaissent comme des réductionnismes et de véritables obstacles au plaisir de lire ou de faire résonner avec justesse la signification d’une œuvre d’artThis thesis proposes a theorical discourse on the fictional mediation, more particularly in the novels of our corpus. From a rhetorical perspective, the research consists in studying the process of implementation of the signification in the literary works. The communication appears to it not as a stable and simple datum which we could reduce to formal appearances or still to sociohistorical contents, but as a set of coherent requirements wich specify the terms, otherwise the modalities of the argumentative cooperation between the writer and the reader. The thiking is composed of three parts.The first part consists in indentifiying the question of wich the fiction statement is the answer. It allows to raise, in thematic form, the main axes of the narrative line of argument, consequently the issues of the communication in each novel.The second part deals with the analysis of the formal choices of the statement and it shows on which modes and what ideological end the contribution of the reader is requested. In fact, it’s the discursive strategy wich defines the method of communication and characterizes the functioning of mediation in a literary work.The central idea of the third part is to show the epistemological skill that a writer gives to the literary work and the reader’s ability to identify it. The theories wich become epistemological pools appear as reductionisms and as real obstacles to the pleasure to read or to make pertinently resound the significance of a work art
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Bariteau, Jean-Marc. "Etude et réalisation d'anneaux résonnants en optique intégrée." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0068.
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La technologie optique integree sur substrat silicium permet la realisation d'un microguide d'ondes en anneau couple a des microguides rectilignes formant ainsi une cavite resonante. Cette etude apporte des solutions theoriques et de premiers resultats experimentaux pour cet interferometre integre. Une presentation des resonances observables par interferences a ondes multiples est donnee puis l'influence des divers parametres sur les pics de resonance est etudiee. Une evaluation des pertes dues a la courbure de ces microguides est effectuee et le couplage entre microguides est calcule par la methode de perturbation. Les parametres technologiques utilisables sont ensuite determines pour differents rayons d'anneau et les caracteristiques de resonance des anneaux realises sont indiquees ainsi que les valeurs de pertes et de couplage qui s'en deduisent
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Talanda, Ivan. "Optimalizace technologie výroby odlitků ze slitin Al metodou vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230150.
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Aim of this diploma thesis is to choose new pattern wax for Fimes a.s. foundry. New wax should substitute old not fully satisfactory pattern wax which caused problems in technological process resulting in increased number of rejects. New pattern wax should eliminate current problems and help foundry with producing large, thin-walled, high-quality castings. Numbers of pattern waxes supplied by world’s leading wax manufacturers were subjected to laboratory tests and pilot study. This diploma thesis is part of project Alfa TA01010766: „Research and development of production technology large, thin and high quality castings of aluminium alloys “
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Linda, Matúš. "Tlakové ztráty nosičů katalyzátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378393.
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The diploma thesis is divided into four main parts. The first part deals with the issue of waste management and its energy utilization in waste incineration. Processed harmful substances produced by incineration as well as emission limits. It deals with the types of catalytic carriers, their description, production and more detailed processing of ceramic foam VUKOPOR. The second part is devoted to technologies utilizing catalytic processes and a more detailed specification of the process. In the third part there is processed the calculation methods for pressure losses for individual types of carriers. Fourth, the most extensive part describes the INTEQII experimental device, its technology and construction, as well as the principle of the practical part, measuring of the pressure losses of carriers. It includes the evaluation of pressure losses in separate categories of carriers, such as the bed, HoneyComb and VUKOPOR ceramic foam. Subsequently, a comparison of the pressure losses of all carriers is made relative to the reference size of 1 m. The impact of bonding of VUKOPOR foam samples on the size of pressure losses is discussed. At the end of this section, the suitability of calculation methods for individual carriers is evaluated, depending on the experimental pressure loss data.
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Mohebby, Behbood. "Biological attack of acetylated wood." Doctoral thesis, Göttingen : Cuvillier, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010518063&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Tomljenovic-Hanic, Snjezana. "Propagation effects in optical waveguides, fibres and devices." Phd thesis, 2003. http://hdl.handle.net/1885/48210.
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Ben, Cécile. "Analyse du transcriptome lors de l'embryogenèse précoce chez le Tournesol." Phd thesis, 2005. http://oatao.univ-toulouse.fr/7273/1/ben1.pdf.
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Chez les végétaux supérieurs, l’embryogenèse est une phase clé du développement au cours de laquelle l’embryon établit les principales structures qui formeront la future plante et synthétise et accumule des réserves définissant le rendement et la qualité nutritionnelle des graines. La compréhension des évènements moléculaires et physiologiques menant à la formation de la graine est donc d’un intérêt agronomique majeur. Le tournesol (Helianthus annuus L.), qui présente une inflorescence portant des embryons de taille relativement grande et dont le développement est synchronisé et un génome maintenant bien caractérisé, constitue un bon système expérimental pour l’étude de l’embryogenèse zygotique chez les dicotylédones. Afin de caractériser le transcriptome au cours de l’embryogenèse précoce chez le tournesol, des banques d’ADNc de référence ont été construites à partir d’embryons au stade globulaire, coeur et cotylédonaire qui constituent des stades clé du développement. Une banque d’ADNc de type SSH (Suppressive Substractive Hybridization) comparant les transcrits d’embryons aux stades coeur et cotylédonaire et enrichie en gènes préférentiellement exprimés au stade coeur a également été réalisée. Au total, 23 800 clones ont été générés dont 4 118 ont été séquencés et 1 690 séquences EST publiées (numéro d’accession : AJ827751-AJ829440). Au cours d’analyses in silico, les séquences obtenues au sein de notre laboratoire à partir des banques de référence ont été couplées à d’autres données EST issues de banques d’ADNc produites à partir d’ovules non fécondés (HadevR7) ou d’embryons cotylédonaires à des stades plus tardifs (HaDevR5 et HaDevR6) réalisées dans le cadre du programme Génoplante. L’ensemble des séquences analysées représente un total de 7 106 EST et un unigène de 3064 séquences (Ben et al., 2005). La caractérisation fonctionnelle des séquences uniques de chacune des banques d’ADNc a permis d’avoir une vue globale des fonctions cellulaires impliquées à chaque stade de développement et de leur importance relative. Les profils fonctionnels, très similaires pour chacun des stades de développement étudiés, ont montré que les embryons zygotiques sont engagés dans des processus de différenciation et présentent une activité cellulaire très élevée. Des analyses de northerns virtuels ont révélé des gènes différentiellement exprimés entre les différentes conditions. Des séquences montrant de fortes similarités avec des gènes jouant des rôles clés dans l’embryogenèse animale ou végétale ont également pu être identifiées comme, par exemple, le gène MAGO NASHI participant à l’élaboration des axes embryonnaires chez la Drosophile et dont la caractérisation moléculaire et fonctionnelle chez le tournesol a été entreprise au laboratoire. Par la suite, ces banques d’ADNc, associées à d’autres banques d’ADNc préparées à partir de tissus d’origines très diverses, ont été utilisées pour construire un microarray sur membrane nylon comptant 8 185 séquences uniques. Ce microarray a été hybridé avec des ADNc issus d’embryons dans les trois stades de développement d’intérêt (globulaire, coeur et cotylédonaire) ainsi que des ADNc préparés à partir d’ovules non fécondés et de feuilles, ces derniers échantillons représentant respectivement un témoin de tissus reproducteurs non fécondés et un témoin de tissus somatiques. L’analyse statistique des résultats de ces expériences, réalisée en pratiquant deux anovas interconnectées, a révélé 744 gènes différentiellement exprimés entre aux moins deux conditions. Une analyse plus fine, effectuée après avoir défini 4 contrastes particulièrement intéressants (embryons globulaires vs embryons coeur, embryons précoces (globulaire et coeur) vs embryons cotylédonaires, embryons (globulaire, coeur et cotylédonaire) vs ovules non fécondés et tissus reproductifs (embryons et ovules) vs feuille), a mis en évidence de 106 gènes différentiellement exprimés entre les embryons et les ovules jusqu’à 437 entre les feuilles et l’ensemble des tissus reproducteurs. L’étude du profil d’expression de ces gènes nous a permis de dégager des hypothèses sur les mécanismes induits au cours des phases précoces de l’embryogenèse chez les plantes impliquant notamment une régulation transcriptionnelle et post-transcriptionnelle fine et spécifique à chacun des stades de développement et diverses voies de transduction du signal. La biogenèse de plastes fonctionnels ainsi que la sénescence semble également jouer un rôle essentiel dans le déroulement normal de l’embryogenèse.
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Peng, Yi-Wen, and 彭怡文. "Circular-shape No-loss Bent Lightpipe: design and analysis." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76893767941460393466.
Full textAbstract:
碩士國立交通大學
顯示科技研究所
96
This thesis is primarily based on the equiangular-spiral non-loss bent lightpipe then extends to design the circular non-loss bent lightpipe. For the applications of the lightpipe, the bent of the shape of lightpipe often accompanies the loss of the light as propagated. For this problem, the former had design the equiangular-spiral non-loss bent lightpipe by the observation of golden spiral. This design could make the lights turn with the condition of the total internal reflection as it propagates in the pipe. So this kind of bent lightpipe has the property of 100% non-loss. But the geometrical limitation caused by the shape of interface affects the application of the lightpipe in connection with other pipes. What we have done is to design the circular non-loss bent lightpipe with the understanding of the equiangular-spiral non-loss bent lightpipe. This pipe keeps the property of 100% non-loss at the bent part of lightpipe, but also improves the problem of the shape of interface in the equiangular-spiral non-loss bent lightpipe. After these discussions we also have the observation of the theorem of non-loss for the circular non-loss bent lightpipe and set up the experiment to compare the result with the simulation by the program.
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Tang, Hao Xie Yuefeng F. Regan John M. "Prediction of clean-bed head loss in crumb rubber filters." 2008. http://etda.libraries.psu.edu/theses/approved/PSUonlyIndex/ETD-3596/index.html.
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Lin, Han Bin, and 林漢賓. "A study of optical waveguide bends and branches with low-loss and wide-angle characteristics." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/47355343713766053756.
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Wu, Shu-Lun, and 吳淑倫. "Glass art study : Exploreing the lost puzzle from Paiwan traditional glass bead." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89684103672485870280.
Full textAbstract:
碩士國立東華大學
民族藝術研究所
98
This research included three parts：First，based on the glass beads of Paiwan，investigate the original myths of traditional glass beads creation and the spirits within by field research with the mountain Ta wu the eastern, northern and midland side of Paiwan tribe. Second, we observed the Paiwan people characteristics and preferences on colors of Paiwan, and find the unique colors of this culture and the meanings within, and analyzed the special aesthetic factor of Paiwan tribe culture by field research. Finally, Making art creations about the result of foregoing researches with glass and mixed media.This research would provide the firsthand data for future artists and the researchers of tribe cultures when doing art creations or poceeding culture of cractive industries research.
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Mallan, Robert Keays. "Interpretation of multi-component induction and sonic measurements acquired in high-angle wells and joint 1D radial inversion of resistivity and sonic logs." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1480.
Full textAbstract:
Multi-component induction resistivity and sonic measurements acquired in high-angle wells can be strongly influenced by shoulder-bed effects, anisotropy resulting from sand-shale laminations, and presence of mud-filtrate invasion. Understanding the corresponding biasing effects aids in the interpretation of resistivity and sonic measurements and subsequently leads to more accurate and reliable formation evaluation.
This dissertation describes numerical simulation studies examining the effects on multi-component induction and sonic measurements in a variety of complex formation models. Subsequently, a joint inversion scheme is presented that combines resistivity and sonic measurements to estimate in situ petrophysical and elastic properties in the presence of mud-filtrate invasion.
To facilitate the simulation study of multi-component induction logs, I develop a new finite-difference algorithm for the numerical simulation of frequency-domain electromagnetic borehole measurements. The algorithm~uses a coupled scalar-vector potential formulation for arbitrary three-dimensional inhomogeneous and electrically anisotropic media. Simulations show that shoulder-bed anisotropy: enhances shoulder-bed effects across sand layers; and impacts invasion sensitivities to significantly alter the assessment of invasion in terms of invaded- and virgin-zone resistivities, radial length, and front shape.
For the simulation study of sonic logs, I develop a three-dimensional, finite-difference time-domain algorithm that models elastic wave propagation in a fluid-filled borehole. Simulations show that presence of anisotropy not only alters the degree of dispersion observed in flexural and Stoneley waves, but also alters their responses to invasion. In addition, presence of a dipping shoulder bed can significantly distort flexural dispersion, making it difficult to identify the low frequency asymptote corresponding to formation shear wave velocity.
Lastly, I consider a radial one-dimensional model in the development of a joint resistivity and sonic inversion algorithm. This scheme simultaneously inverts array-induction apparent conductivities and sonic flexural and Stoneley dispersions for the rock's elastic moduli and water saturation in the presence of mud-filtrate invasion. Inversions are performed on numerically simulated data for a variety of models reflecting soft and hard rock formations with presence of water- and oil-based mud-filtrate invasion. Results show the estimated invasion profiles display excellent agreement with the true models, and the elastic moduli are estimated to within a few percent of the true values.text
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Page, Tamara Elaine. "The impact of exposure time on biophysical parameters of the wound environment and patient comfort during dressing changes: a descriptive study." Thesis, 2015. http://hdl.handle.net/2440/93923.
Full textAbstract:
Wound healing is a complex milieu that affects millions of people around the world every day. Practice based concerns have been described anecdotally by nurses in acute care facilities where wounds requiring an assessment by health care professionals have been left without their primary dressings for a considerable length of time. A number of studies have demonstrated that the temperature, transepidermal water loss (TEWL) and pH of a wound's microenvironment influence wound healing; however, there is limited research on the effect of the dressing changes on these parameters as well as the risk of contamination of the wound through prolonged exposure. The impact of prolonged exposure throughout delays in a dressing change on these biophysical wound bed parameters and the possible contamination of the wound during the wound dressing procedure; and the affect delays have on patient pain, comfort and activities of daily living, were investigated through a descriptive correlational study. Demographics and participant questionnaire data were analysed using descriptive statistics and frequency distributions. Patterns of distribution of the wound temperature, TEWL and pH data were reviewed before being further analysed along with the bacterial and patient questionnaire data using Generalised Estimating Equations regression models. A GEE linear regression model was used for normally distributed data; and GEE logistic regression models for data which were not normally distributed, using the Statistical Analysis System (SAS) 9.3. The results identified that the participants’ wounds were hypothermic as well as alkaline at dressing removal and throughout the period of exposure. The mean wound temperature increased throughout the total duration of the down time which was contrary to expectation, although despite this all wounds remained hypothermic. The pH became more alkaline with the chance of having a pH of >8.5, 12% higher than having a pH of <8.5. There was no relationship between the size of the wound and any of the wound bed parameters; however, there was a relationship between the type of wound, the temperature and pH. No associations could be made in regards to the participant’s body temperature and wound temperature. In addition to the investigation into the wound bed parameters, agar plates placed in proximity to the exposed wounds grew pathogens which could potentially contaminate the wound. The third issue investigated was the affect wound dressing changes on the participant's pain, comfort and activities of daily living, an important aspect of the holistic approach to patient care. Participants were noted to be unable to perform some activities of daily living; including hygiene, toileting, nutrition and positioning during the wound down time. Analgesia was offered haphazardly despite the majority of patients having a pain score pre dressing removal that would indicate analgesia was required and an associated increase in their pain score during the dressing procedure. The impact of delayed wound dressing changes on the patient’s activities of daily living and pain are important in the delivery of patient centred care; however the major findings of the study relate to the poor state of the wounds immediately following removal of the dressing. Hypothermic, alkaline wound beds are not conducive to healing and warrant further investigation.Thesis (Ph.D.) -- University of Adelaide, School of Nursing, 2015
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Aji, Irwan Mahakam Lesmono. "Development of production of Lentinula edodes (Shiitake mushrooms) on inoculated logs of a range of tree species." 2009. http://repository.unimelb.edu.au/10187/7073.
Full textAbstract:
Shiitake (Lentinula edodes (Berkeley) Pegler) produces an edible mushroom that has been cultivated for centuries in China, Korea, Japan, Singapore, Thailand and other Asian countries. Shiitake mushrooms grow naturally on decaying wood of hardwood trees and have traditionally been grown on short lengths of freshly-cut logs. Until now, there has been no serious exploration of the potential for Australian forest owners to utilise small logs of native or plantation forest species for shiitake mushroom production, such as eucalypt (Eucalyptus spp.).Logs of six tree species were harvested from farm forestry plantations in Victoria and inoculated with shiitake infected dowels imported from the United States. Over the course of the next 18 months the logs were soaked four times to initiate fruiting. The fresh mushrooms were harvested and weighed to allow a comparison between log species and size. A sample of the mushrooms from each log species produced in the 2nd and 3rd fruiting were tested for their protein and fibre content.
Quercus robur was the most productive species. Over the course of the trial (four frutings) the oak logs produced almost 1 kilogram of fresh mushrooms per log which was significantly more than E. cladocalyx (527 g/log) and Alnus glutinosa (465 g/log) and Eucalyptus nitens (389 g/log) which were all, in turn, significantly more productive than Populus sp. (140 g/log) and Acacia melanoxyon (98 g/log). Larger logs produced more fruit although this may have been related to the greater number of inoculations. The protein and fibre content of mushrooms produced from shining gum logs was slightly lower than that from the oak logs but greater than that from alder. Sugar gum mushrooms had the lowest protein content.
The research suggests that there is potential to use eucalypt logs thinned from young fast-grown farm plantations as the basis for a log-based shiitake industry although more work is required to test the marketability of eucalypt grown shiitake and the economic viability of small scale production units.
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Choi, Jaemin. "Theatricality, Cheap Print, and the Historiography of the English Civil War." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7669.
Full textAbstract:
Until recent years, the historical moment of Charles II's return to England was
universally accepted as a clear marker of the end of "the Cavalier winter," a welcome
victory over theater-hating Puritans. To verify this historical view, literary historians
have often glorified the role of King Charles II in the history of the "revival" of drama
during the Restoration, whereas they tend to consider the Long Parliament's 1642
closing of the theaters as a decisive manifestation of Puritans' antitheatricalism. This
historical perspective based upon what is often known as "the rupture model" has
obscured the vibrant development of dramatic forms during the English civil wars and
the ways in which the revolutionary energy exploded during this period continued to
influence in the Restoration the deployment of dramatic forms and imagination across
various social groups. By focusing on the generic development of drama and
theatricality during the English civil wars, my dissertation challenges the conventional historiography of the English civil war literature, which has been overemphasizing the
discontinuity between the English civil war and the periods before and after it.
The first chapter shows how the theatrical energy displaced from traditional
cultural domains energized an emerging cheap print market and contributed to the
invention of new dramatic forms such as playlets and newsbooks. The second chapter
questions the conventional association of Puritanism and antitheatricalism by rehistoricizing
antitheatrical writers and their pamphlets and by highlighting the dramatic
impulses at work in Puritan iconoclasm during the English civil wars. The final chapter
offers the Restoration Milton as a case study to illustrate how the proposed historical
perspective replacing "the rupture model" better explains not only the politics of
Milton's Paradise Lost but also of Restoration drama.
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Chaput-Desrochers, Laurence. "Caractéristiques des structures turbulentes de l'écoulement et du transport en charge de fond en rivière à lit de graviers lors de la montée d'une crue." Thèse, 2013. http://hdl.handle.net/1866/9658.
Full textAbstract:
En rivière à lit de graviers, le transport des sédiments en charge de fond est un processus intermittent qui dépend de plusieurs variables du système fluvial dont la prédiction est encore aujourd’hui inexacte. Les modèles disponibles pour prédire le transport par charriage utilisent des variables d’écoulement moyen et la turbulence n’est généralement pas considérée malgré que les tourbillons contenus dans les écoulements possèdent une quantité d’énergie importante. L’utilisation de nouvelles approches pour étudier la problématique du transport par charriage pourrait nous permettre d’améliorer notre connaissance de ce processus déterminant en rivière alluviale. Dans ce mémoire, nous documentons ces composantes de la dynamique fluviale dans un cours d’eau graveleux en période de crue. Les objectifs du projet de recherche sont : 1) d’examiner l’effet du débit sur les variables turbulentes et les caractéristiques des structures turbulentes cohérentes, 2) d’investiguer l’effet du débit sur les caractéristiques des événements de transport de sédiments individuels détectés à l’aide d’un nouvel algorithme développé et testé et 3) de relier les caractéristiques de l’écoulement turbulent aux événements de transport de sédiments individuels. Les données de turbulence montrent qu’à haut niveau d’eau, l’écoulement décéléré est peu cohérent et a une turbulence plus isotrope où les structures turbulentes cohérentes sont de courte durée. Ces observations se distinguent de celles faites à faible niveau d’eau, en écoulement accéléré, où la plus grande cohérence de l’écoulement correspond à ce qui est généralement observé dans les écoulements uniformes en rivières graveleuses. Les distributions de fréquence des variables associées aux événements de transport individuel (intensité de transport moyenne, durée d’événement et intervalle entre événements successifs) ont des formes différentes pour chaque intensité de crue. À haut niveau d’eau, le transport est moins intermittent qu’à faible débit où les événements rares caractérisent davantage les distributions. L’accélération de l’écoulement à petite échelle de temps joue un rôle positif sur le transport, mais surtout lorsque la magnitude de la crue mobilisatrice est en dessous du niveau plein bord. Les résultats de l’étude montrent que les caractéristiques de la turbulence ainsi que les liens complexes entre l’écoulement et le transport par charriage sont fonction du débit.In gravel-bed rivers, bedload transport is an intermittent process related to many variables of the fluvial system whose prediction is still unreliable. Available models for prediction of bedload transport use mean hydraulics variables and generally do not consider turbulence even if coherent turbulent flow structures in rivers are highly energetic. New approaches to bedload transport investigation can shed light on this very important process in alluvial channels. In this thesis, we document these components of the fluvial system in a gravel-bed river during a flood. The objectives of the research are to: 1) investigate the effect of discharge on turbulent variables and turbulent coherent flow structures, 2) investigate the effect of discharge on bedload transport events statistics detected with a newly developed and tested algorithm and 3) link turbulent flow characteristics to individual bedload transport events. Turbulence data shows that at high water level, the decelerated flow has a low coherency and an isotropic turbulence where coherent turbulent flow structures have a short duration. These observations differ from those made at low water level where the accelerated flow corresponds to what is generally observed in uniform flows of gravelly channels. Frequency distributions of bedload transport events variables (mean bedload transport rate, event duration and time interval between successive bedload events) have different shapes for the two investigated flood intensity. At high water level, bedload transport is less intermittent that at low discharge where distributions are more characterised by rare events. Flow velocity acceleration on a short time scale has a positive effect on bedload transport, but mainly when the mobilizing flood is under bankfull stage. Results from the study show that turbulence properties and complex relationships between turbulence and bedload transport are a function of discharge.