Tesis: "Three Dimensional Model"

1

Kim, Hyoseob. "Three dimensional sediment transport model". Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359035.

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2

Campos, RogeÌrio. "Three-dimensional reservoir sedimentation model". Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421172.

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3

Tremblay, André 1948. "A three dimensional cloud chemistry model /". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73980.

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4

Gray, Sean. "Bootstrapping the Three-dimensional Ising Model". Thesis, Uppsala universitet, Teoretisk fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-322146.

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This thesis begins with the fundamentals of conformal field theory in three dimensions. The general properties of the conformal bootstrap are then reviewed. The three-dimensional Ising model is presented from the perspective of the renormalization group, after which the conformal field theory aspect at the critical point is discussed. Finally, the bootstrap programme is applied to the three-dimensional Ising model using numerical techniques, and the results analysed.

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5

Mosaad, Eman Mohamed Othman. "Three dimensional prostate cancer model systems". Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/118287/1/Eman%20Mohamed%20Othman_Mosaad_Thesis.pdf.

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The prediction of drug efficacy is a major limitation in the cancer research field. This thesis was a step forward in developing an in vitro 3-dimensional prostate cancer model as a potential high throughput drug-screening platform. The merits of using a high throughput microwell platform to efficiently manufacture hundreds of multicellular spheroids were evaluated. The improved Microwell-mesh platform was evaluated as a drug-screening platform. A critical factor was the discovery of the cell-specific bioluminescence assay instability, which was promoter and/or cell line dependent. The first multicellular co-culture micro-tumour system as a potential drug-screening platform for bone metastatic prostate cancer was developed.

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6

Zhu, Hongyan. "A minimal three-dimensional tropical cyclone model". Diss., [S.l. : s.n.], 2002. http://edoc.ub.uni-muenchen.de/archive/00000260/.

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7

Kapur, Tina. "Model based three dimensional medical image segmentation". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80007.

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8

Syn, Michael Hsien-Min. "Model-based three-dimensional freehand ultrasound imaging". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627596.

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9

Bolger, John Jude. "Three dimensional design of compressor blades". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/251477.

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10

Sampson, R. Mark. "Three dimensional visualization of a coastal mesoscale model". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA278576.

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11

Bussmann, Markus. "A three-dimensional model of an impacting droplet". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0026/NQ49938.pdf.

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12

Lauzon, Louise. "Evaluation of a three dimensional cloud chemistry model". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56995.

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To evaluate the precision of a three dimensional cloud chemistry model, the ion concentrations of simulated clouds are compared with the chemical analysis of cloud water samples collected in the Muskoka, Ontario area. Five summer case studies are presented.
In general, the simulated concentrations of NO$ sbsp{3}{-},$ NH$ sbsp{4}{+},$H$ sp+$, H$ sb2O sb2$ and the concentrations of SO$ sbsp{4}{2-}$ calculated with the perfect nucleation condition concur with the observed concentrations. For the four polluted cases, more than 80% of the cloud water SO$ sbsp{4}{2-}$ comes from nucleation, whereas for the clean case, it is mostly created by SO$ sb2$ oxidation. The relative importance of $ rm H sb2O sb2$ and O$ sb3$ in SO$ sb2$ oxidation, as well as the relative importance of nucleation and NH$ sb3$ absorption on the cloud water NH$ sbsp{4}{+}$ budget vary according to the chemical state of the atmosphere.

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13

Aubry, Stéphane. "Three-dimensional model construction from multiple sensor viewpoints". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41524.

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This work addresses the automatic construction of geometric models of real scenes, from multi-view three-dimensional sensor data.
We review range data acquisition, multi-view integration, and solid modeling. We show that knowledge about the data acquisition procedure yields not only the coordinates of the acquired points, but also additional geometrical information. We use that information to draw a geodesic proximity graph with respect to the surface the data points lie on. Such a graph is useful because it provides the connectivity information necessary for subsequent differential-geometric processing, and three-dimensional surface modeling. We say that the graph is a least-commitment boundary representation, because it does not involve the use of higher level or cognitive processes.
We specialize the concept to the common case of line-of-sight optical sensors. We give formal definitions of graph validity using assumptions of object opacity and object rigidity, and we demonstrate that Euclidean proximity graphs drawn on the data points are not valid when the data is sparse with respect to surface concavities.
We describe a sub-quadratic incremental view integration algorithm that assumes the data is highly-organized. It guarantees graph validity under restrictive conditions. Therefore, we present another non-incremental algorithm with no assumption on the input data organization. It is based on an iterative carving of the graph faces, starting with the convex hull of all points as the initial model. It builds a hierarchy of models, each of which is internal to the previous one. We test the algorithm with real data on an object homeomorphic to a sphere, and incorporate heuristics designed to yield more geometrically pleasing results.

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14

Ward, David Dewick. "Three-dimensional model of the lightning return stroke". Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292224.

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15

Basu, Sumit. "A three-dimensional model of human lip motion". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43317.

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16

Wang, Kuoying. "Development of a three-dimensional tropospheric chemistry model". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624975.

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17

Harwood, Thomas David. "Dynamic three-dimensional plant-microclimate simulation model 'Ecospace'". Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/10946.

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Growing plants modify the microclimate within which they grow by altering their physical structure. Thus individuals affect the subsequent growth of both themselves and competing neighbours. It is important that this feedback be represented in a model of dynamic vegetation change. A flexible generalised model "Ecospace" is presented, which was designed to be applicable to all terrestrial vegetation. The model uses a three-dimensional grid of hexagonal tiles to represent space above and below ground. Each individual plant may occupy one or more tiles within the grid. Any number of individuals may occupy each tile until all space is filled. Microclimate, comprising solar radiation, wind and temperature, is calculated for each tile. Plant growth depends on the microclimate of occupied tiles. Three different plant functional groups are represented. The current model can represent an area of up to 50 m2 for low shrub vegetation. However, at present, computer run time and restricted memory limits the volume which can practically be simulated. There is no fundamental reason why these limits could not be overcome. Some model runs are presented for heather plants growing under different structural and climatic regimes. Since the model represents the feedback of vegetation structure on microclimate, it is suitable for studies of the impact of changing weather patterns on ecosystems.

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18

Jeng, D. Isaac. "A Three-dimensional Model of Poroviscous Aquifer Deformation". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29977.

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A mathematical model is developed for quantification of aquifer deformation due to ground-water withdrawal and, with some modifications, is potentially applicable to petroleum reservoirs. A porous medium saturated with water is conceptually treated in the model as a nonlinearly viscous fluid continuum. The model employs a new three-dimensional extension, made in this thesis, of Helm's poroviscosity as a constitutive law governing the stress-strain relation of material deformation and Gersevanov's generalization of Darcy's law for fluid flow in porous media. Relative to the classical linear poroelasticity, the proposed model provides a more realistic tool, yet with greater simplicity, in modeling and prediction of aquifer movement. Based on laboratory consolidation tests conducted on clastic sedimentary materials, three phases of skeletal compaction are recognized. They are referred to as "instantaneous compression", "primary consolidation" and "secondary compression" according to Terzaghi and Biot's theory of poroelasticity. Among the three modes of consolidation, material behavior during the secondary compression phase has a nonlinear stress-strain relationship and is strongly time-dependent, exhibiting a phenomenon often known as "creep". In poroelasticity, the primary and secondary compressions have been conceptually considered as two separate physical processes that require two sets of material parameters to be evaluated. In contrast, the proposed poroviscosity model is a unified theory of time-dependent skeletal compression that realistically describes the physical phenomena of sediment compression as one single transient process. As a general model, two sets of governing equations are formulated for Cartesian and cylindrical coordinates, respectively, and allow for mechanical anisotropy and the assumption of principal hydraulic directions. Further simplifications of the governing equations are formulated by assuming mechanical isotropy, irrotational deformation and mechanical axisymmetry, which are more suitable for field applications. Incremental forms of the governing equations are also provided.
Ph. D.

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19

Fukazawa, Hirono. "Superconductivity in Two and Three-dimensional Hubbard Model". 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/149046.

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20

Liu, Jianzhi. "A two-dimensional human spine simulation and three-dimensional spine model construction". [Gainesville, Fla.] : University of Florida, 2001. http://purl.fcla.edu/fcla/etd/UFE0000329.

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Thesis (M.S.)--University of Florida, 2001.
Title from title page of source document. Document formatted into pages; contains xi, 114 p.; also contains graphics. Includes vita. Includes bibliographical references.

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21

Liang, Chen. "3D model reconstruction from silhouettes". Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b40203311.

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22

Liang, Chen y 梁晨. "3D model reconstruction from silhouettes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40203311.

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23

Bricis, Anne. "Three dimensional simulation of cloth drape". Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/6932.

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Research has been carried out in the study of cloth modelling over many decades. The more recent arrival of computers however has meant that the necessary complex calculations can be performed quicker and that visual display of the results is more realistic than for the earlier models. Today's textile and garment designers are happy to use the latest two dimensional design and display technology to create designs and experiment with patterns and colours. The computer is seen as an additional tool that performs some of the more tedious jobs such as re-drawing, re-colouring and pattern sizing. Designers have the ability and experience to visualise their ideas without the need for photo reality. However the real garment must be created when promoting these ideas to potential customers. Three dimensional computer visualisation of a garment can remove the need to create the garment until after the customer has placed an order. As well as reducing costs in the fashion industry, realistic three dimensional cloth animation has benefits for the computer games and film industries. This thesis describes the development of a realistic cloth drape model. The system uses the Finite Element Method for the draping equations and graphics routines to enhance the visual display. During the research the problem of collision detection and response involving dynamic models has been tackled and a unique collision detection method has been developed. This method has proved very accurate in the simulation of cloth drape over a body model and is also described in the thesis. Three dimensional design and display are seen as the next logical steps to current two dimensional practices in the textiles industry. This thesis outlines current and previous cloth modelling studies carried out by other research groups. It goes on to provide a full description of the drape method that has been developed during this research period.

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24

Wang, Lu y 王璐. "Three-dimensional model based human detection and tracking in crowded scenes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46587421.

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25

Yu, Ting. "Stereo-Based Three-Dimensional Model Acquisition and Motion Detection". Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28866.

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Deformable models have a long tradition in computer graphics and computer vision. This thesis looks at the capture of surface deformation based on stereo vision. In recent years, 3D reconstruction and motion detection has attracted great attention. In this thesis a framework for 3D reconstruction from mutli-view images followed by isometry-based motion detection is proposed. For 3D reconstruction, the thesis proposes a multi-view stereo algorithm based on well-known window-based matching combined with fusion of multiple matching results. To improve the matching result, some low-level image processing algorithms, camera calibration and background detection are utilized. For window-based matching, a new hybrid matching method is introduced by combining both, a measure of intensity difference and intensity distribution difference. Multiple MVS pointclouds from different reference views are fused with two new fusion strategies to generate a better final reconstruction. To characterize the performance of our matching method and fusion strategies, an evaluation based on the quality of reconstruction is given in the thesis. Based on 3D pointclouds of object surface obtained with stereo, the deformation of the surface is captured. To generate dense motion vectors over a deformed surface, a simple window-based 3D flow method is applied by using isometry of the observed surface as its primary matching constraint. The method uses feature points as anchoring references of the surface deformation. Given a set of matched features no other intensity information is used and hence the method can tolerate intensity changes over time. The approach is shown to work well on two example scenes which capture non-rigid isometric and general deformations. The thesis also presents experiments demonstrating the stability of the geodesic approximation employed in the isometry-based matching when the 3D pointclouds are sparse.

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26

Papaioannou, George. "A three dimensional mathematical model of the human knee". Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21143.

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Muscle and joint force during locomotion is estimated according to available formulations consistent with available methods of solving the indeterminate problem. In the case of the knee joint direct comparisons of results between several optimization methods proposed in the literature presents difficulties due to largely varying model formulation, input data, algorithms and other issues. The application presented here introduces a new optimization program which includes linear and non-linear techniques allowing greater flexibility in problem formulation. It also increases the variety of cost functions under a unified solution which allows for direct evaluation of factors such as optimization criteria and constraints. The method demonstrates that nonlinear solutions lead to more synergistic activity and in contrast to linear formulations, allows antagonistic activity. Nonlinearity also improves concurrence of EMG activity and predicted forces. Higher joint force predictions are resulting as expected from improved predictions of synergistic-antagonistic activity. The formulation allows for relaxation of the requirement that muscles resolve the entire intersegmental moment which in turn maintains muscle synergism in the nonlinear formulation while relieving muscle antagonism and reducing the predicted joint contact force. These methods allow for more possibilities for exploring new optimization formulations and in comparing the solutions to previously reported formulation. The present study based its input data on healthy subjects volunteering for a variety of walking tasks involving normal walking and turning during walking. Muscle and joint contact forces agree with other published results and the lateral: medial bony contact force distribution is calculated as 1: 2.5.

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27

Harris, R. J. "Three dimensional investigations of a porous media micro-model". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603767.

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Many of the fundamental fluid flow processes occurring in oil recovery are poorly understood. The work in this dissertation investigates both miscible and immiscible displacements in model porous media at both the meso- and pore-scale, in order to better understand these processes. To this end, confocal laser scanning microscopy (CLSM) has been used to image, at the pore-scale, the displacement of a hydrocarbon by both a Newtonian and non-Newtonian aqueous solution in 3D in a fully refractive index matched system, within a bespoke micro-model. CLSM has also provided 3D reconstruction of a packing of ballotini that was subsequently used in lattice Boltzmann (LB) simulations. Pulsed field gradient nuclear magnetic resonance (PFG NMR) has been used to acquire displacement distributions (propagators) of both Newtonian and non-Newtonian fluids flowing through packed ballotini either 100 or 500 μm in diameter in a cylindrical Perspex cell, in order to investigate the effects of complex rheology on dispersion in a model porous medium. The differences between the distributions are quantified using comparisons of the full distributions and a cumulant analysis. The immiscible displacement of hydrocarbons in a model porous medium of 100 μm diameter packed glass ballotini by injected water is monitored using MRI to investigate the effects of different physical characteristics (interfacial tension, density and wettability) of the fluids. Displacement distributions of water flowing through a packing of glass ballotini, containing trapped decane blobs have been acquired in both a cylindrical cell and the micro-model. LB simulations, in conjunction with a directed random-walk algorithm have been used to simulate the displacement distributions (propagators) obtained experimentally at all stages in the project. LB simulations have also been used to show the effect of channel aspect ratio on flow through simulation masks, to investigate the applicability of 2D simulations to inherently 3D systems. The effects of spin relaxation of fluid molecules, due to contact with a solid surface, as experienced in NMR experiments has also been investigated.

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28

Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying". Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15960/1/Simon_Trustcott_Thesis.pdf.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide a realistic representation of this behaviour, a set of previously determined parameters derived using sophisticated image analysis methods and homogenisation techniques is embedded within the model. From the literature it is noted that current three-dimensional computational models for wood drying do not take into consideration the heterogeneities of the medium. A significant advance made by the research conducted in this thesis is the development of a three - dimensional computational model that takes into account the heterogeneous board material properties which vary within the transverse plane with respect to the pith position that defines the radial and tangential directions. The development of an accurate and efficient computational model requires the consideration of a number of significant numerical issues, including the virtual board description, an effective mesh design based on triangular prismatic elements, the control volume finite element discretisation process for the cou- pled conservation laws, the derivation of an accurate dux expression based on gradient approximations together with flux limiting, and finally the solution of a large, coupled, nonlinear system using an inexact Newton method with a suitably preconditioned iterative linear solver for computing the Newton correction. This thesis addresses all of these issues for the case of low temperature drying of softwood. Specific case studies are presented that highlight the efficiency of the proposed numerical techniques and illustrate the complex heat and mass transport processes that evolve throughout drying.

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29

Truscott, Simon. "A heterogenous three-dimensional computational model for wood drying". Queensland University of Technology, 2004. http://eprints.qut.edu.au/15960/.

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The objective of this PhD research program is to develop an accurate and efficient heterogeneous three-dimensional computational model for simulating the drying of wood at temperatures below the boiling point of water. The complex macroscopic drying equations comprise a coupled and highly nonlinear system of physical laws for liquid and energy conservation. Due to the heterogeneous nature of wood, the physical model parameters strongly depend upon the local pore structure, wood density variation within growth rings and variations in primary and secondary system variables. In order to provide a realistic representation of this behaviour, a set of previously determined parameters derived using sophisticated image analysis methods and homogenisation techniques is embedded within the model. From the literature it is noted that current three-dimensional computational models for wood drying do not take into consideration the heterogeneities of the medium. A significant advance made by the research conducted in this thesis is the development of a three - dimensional computational model that takes into account the heterogeneous board material properties which vary within the transverse plane with respect to the pith position that defines the radial and tangential directions. The development of an accurate and efficient computational model requires the consideration of a number of significant numerical issues, including the virtual board description, an effective mesh design based on triangular prismatic elements, the control volume finite element discretisation process for the cou- pled conservation laws, the derivation of an accurate dux expression based on gradient approximations together with flux limiting, and finally the solution of a large, coupled, nonlinear system using an inexact Newton method with a suitably preconditioned iterative linear solver for computing the Newton correction. This thesis addresses all of these issues for the case of low temperature drying of softwood. Specific case studies are presented that highlight the efficiency of the proposed numerical techniques and illustrate the complex heat and mass transport processes that evolve throughout drying.

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30

Haid, Benjamin J. (Benjamin John Jerome) 1974. "Two-dimensional quench propagation model for a three-dimensional "high-temperature" superconducting coil". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9598.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
Includes bibliographical references (leaves 89-90).
Quenching is a thermal failure mechanism encountered with superconducting magnets. When a section of conductor is driven normal by an external heat input, the magnet transport current flows through a resistance, causing joule dissipation. If heat is not conducted away from the normal region faster than it is dissipated, the normal region will grow and the temperature will increase indefinitely. Growth of the normal region is commonly refereed to as normal zone propagation(NZP). A reliable NZP model is necessary for designing protection systems because a quench may cause irreparable damage if a section of the winding is over-heated. This thesis develops a numerical NZP model for a three dimensional, dry-wound, BSSCO- 2223 superconducting magnet. The test magnet operates under quasi-adiabatic conditions at 20 K and above, in zero background field. It is contained in a stainless steel cryostat and cooled by a Daikin cryocooler. The NZP model is based on the two-dimensional transient heat diffusion equation. Quenches arc simulated by a numerical code using the finite-difference method. Agreement between voltage traces obtained in the test magnet during heater-induced quenching events and those computed by the numerical NZP model is reasonable. The model indicates that thermal contact resistance has a dominant effect on propagation in the azimuthal direction(across layers). The model is also used to simulate quenching in persistent-mode magnets similar in construction with the test magnet. Specifically studied were effects of magnet inductance, for a given set of operating current and temperature, on the maximum temperature reached in one full turn of the conductor located at the magnet outermost layer driven normal with a heater. The simulation demonstrates that there is an operating current limit for a given magnet inductance and operating temperature below which the magnet can be considered self-protecting. The simulation also demonstrates that shunted subdivision lowers the maximum temperature.
by Benjamin J. Haid.
S.M.

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31

Paladagu, Sandeep. "THREE DIMENSIONAL MODELING OF WEKIVA SPRINGSHED WITH WASH123D". Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3888.

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This thesis presents a three-dimensional groundwater modeling of Wekia springshed in central Florida using a numerical model, WASH123D. Springs have historically played an important role in Florida's history. The Wekiva River is a spring-fed system associated with about 19 springs connected to the Floridan aquifer. With increased urbanization and population growth in this region, there has been an increased strain on the water levels of Floridan aquifer which is a major source of potable water. Maintaining groundwater recharge to the aquifer is a key factor of the viability of the regional water supply as well as Wekiva ecosystem. Hence, the first-principle, physics-based watershed model WASH123D has been applied to conduct the study of Wekiva "springshed", which is the recharge area and watershed contributing groundwater and surface water to the spring. In this work, the hydrogeologic conditions of the Wekiva springshed are discussed followed by the modeling details such as mathematical background, domain discretization and initial and boundary conditions considered. Finally, the results from the model are discussed. The Wekiva WASH123D model was run to evaluate the average, steady state 1995 hydrological conditions. The distribution of simulated Floridan aquifer system groundwater levels using WASH123D shows very good agreement with the field observations at corresponding locations.
M.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering

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32

Deugoue, Gabriel. "Existence of solutions for stochastic Navier-Stokes alpha and Leray alpha models of fluid turbulence and their relations to the stochastic Navier-Stokes equations". Thesis, University of Pretoria, 2010. http://hdl.handle.net/2263/25566.

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In this thesis, we investigate the stochastic three dimensional Navier-Stokes-∝ model and the stochastic three dimensional Leray-∝ model which arise in the modelling of turbulent flows of fluids. We prove the existence of probabilistic weak solutions for the stochastic three dimensional Navier-Stokes-∝ model. Our model contains nonlinear forcing terms which do not satisfy the Lipschitz conditions. We also discuss the uniqueness. The proof of the existence combines the Galerkin approximation and the compactness method. We also study the asymptotic behavior of weak solutions to the stochastic three dimensional Navier-Stokes-∝ model as ∝ approaches zero in the case of periodic box. Our result provides a new construction of the weak solutions for the stochastic three dimensional Navier-Stokes equations as approximations by sequences of solutions of the stochastic three dimensional Navier-Stokes-∝ model. Finally, we prove the existence and uniqueness of strong solution to the stochastic three dimensional Leray-∝ equations under appropriate conditions on the data. This is achieved by means of the Galerkin approximation combines with the weak convergence methods. We also study the asymptotic behavior of the strong solution as alpha goes to zero. We show that a sequence of strong solution converges in appropriate topologies to weak solutions of the stochastic three dimensional Navier-Stokes equations. All the results in this thesis are new and extend works done by several leading experts in both deterministic and stochastic models of fluid dynamics.
Thesis (PhD)--University of Pretoria, 2010.
Mathematics and Applied Mathematics
unrestricted

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33

Pan, Qi. "Rapid 3D model reconstruction from a single camera". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610735.

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34

Lary, David John. "Photochemical studies with a three-dimensional model of the atmosphere". Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386150.

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35

Tsao, Raychang. "Automatic three-dimensional particle tracking in an internal flow model". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17093.

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36

Tie, XueXi. "A three-dimensional global dynamical and chemical model of methane". Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/30885.

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37

Valani, Yogendra P. "On the partition function for the three-dimensional Ising model". Thesis, City University London, 2011. http://openaccess.city.ac.uk/11667/.

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Our aim is to investigate the critical behaviour of lattice spin models such as the three-dimensional Ising model in the thermodynamic limit. The exact partition functions (typically summed over the order of 1075 states) for finite simple cubic Ising lattices are computed using a transfer matrix approach. Q-state Potts model partition functions on two- and three-dimensional lattices are also computed and analysed. Our results are analysed as distributions of zeros of the partition function in the complex-temperature plane. We then look at sequences of such distributions for sequences of lattices approaching the thermodynamic limit. For a controlled comparison, we show how a sequence of zero distributions for finite 2d Ising lattices tends to Onsager’s thermodynamic solution. Via such comparisons, we find evidence to suggest, for example, a thermodynamic limit singular point in the behaviour of the specific heat of the 3d Ising model.

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38

Curodeau, Alain. "Three dimensional printing : machine control from CAD model to nozzles". Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13031.

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39

Grierson, Yvonne Martha. "A three-dimensional whole body model for dynamic motion analysis". Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12768.

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40

Fijan, Robert Scott. "A three-dimensional mathematical model of the human knee joint". Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13974.

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41

MacKenzie, David Bruce Hollis. "The culture cube| A three-dimensional model of political thought". Thesis, Regent University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1601359.

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At any given time, the political culture exhibits various polarized tensions— the progressive versus the conservative sentiment; the social versus the individual perspective; the religious versus the secular point-of-view. Few people— whether scholars or ordinary citizens— doubt that each aspect is potentially influential as a factor on the politico-cultural landscape. Yet, while descriptions of each are many and relatively consistent, formal modular integrations and expressions are relatively few— and may not always be value-neutral. Recognizing that the ubiquitous left-right spectrum may need additional dimension, this thesis presents a model that reflects the familiar aspects of left and right, but adds two more spectra of ideological preference. The net result is a three-dimensional form and metaphor that is easily apprehended, and can aid in providing a quick political classification. Schematically rendered, this metaphor takes the form of a cube. Utilizing survey responses from urban and rural Alberta, Canada, this thesis hopes to provide the reader with a meaningful system of political categorization that may more thoroughly encompass, without partisan pejorative overtones, tendencies as disparate as religious communalism and libertarian secularism.

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42

Pinto, Eduardo Jose. "A Three Dimensional Discretized Tire Model For Soft Soil Applications". Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/41335.

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A significant number of studies address various aspects related to tire modeling; most are dedicated to the development of tire models for on-road conditions. Such models cover a wide range of resolutions and approaches, as required for specific applications. At one end of the spectrum are the very simple tire models, such as those employed in real-time vehicle dynamic simulations. At the other end of the spectrum are the very complex finite element models, such as those used in tire design. In between these extremes, various other models have been developed, at different levels of compromise between accuracy and computational efficiency. Existing tire models for off-road applications lag behind the on-road models. The main reason is the complexity added to the modeling due to the interaction with the soft soil. In such situations, one must account for the soil dynamics and its impact on the tire forces, in addition to those aspects considered for an on-road tire. The goal of this project is to develop an accurate and comprehensive, while also efficient, off-road tire model for soft soil applications. The types of applications we target are traction, handling, and vehicle durability, as needed to support current army mobility goals. Thus, the proposed approach is to develop a detailed semi-analytical tire model for soft soil that utilizes the tire construction details and parallels existing commercially available on-road tire models. The novelty of this project relies in developing a three-dimensional three-layer tire model employing discrete lumped masses and in improving the tire-soil interface model. This will be achieved by enhancing the resolution of the tire model at the contact patch and by accounting for effects and phenomena not considered in existing models.
Master of Science

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43

Cui, Lin. "Three-dimensional Numerical Model for Seabed Foundation Stability around Breakwaters". Thesis, Griffith University, 2020. http://hdl.handle.net/10072/395539.

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With the increasing demand for coastal zones from human activities, a growing number of breakwaters have been constructed around the main beach and major estuaries to defend against wave erosion and damage. The vulnerability of the breakwater foundation can be associated with dynamic soil responses in the vicinity of structure when subjects to the consecutive ocean wave loading. For the severe situations, soil liquefaction may occur around the breakwater foundation, which is considered as a significant cause of catastrophic failures of many marine structures. Therefore, understanding and predicting soil responses and liquefaction potential around breakwaters have become one of the main concerns when design and maintain these marine structures. The traditional models used to analyse the soil responses and liquefaction potential in the neighbourhood of breakwaters were mostly limited to two-dimensional (2D) frameworks, in which only the middle cross-section of the breakwaters under perpendicular waves can be investigated. However, the natural environment is three-dimensional (3D) that involves much more complicated fluid-seabed-structure interactions, which requires a 3D model. What’s more, most of the existing models assumed the seabed foundation as poro-elastic medium, which only the oscillatory soil responses and momentary liquefaction can be studied. Nevertheless, the residual soil responses and liquefaction within the poro-elastoplastic soil are more significant and can cause more severe damage to the marine structure foundations. Another deficiency of the traditional models is the lack of advanced Computational Fluid Dynamic (CFD) model to accurately simulate more realistic conditions, for example, including the interactions of ocean currents. According to the gaps in previous literature, the main objective of this thesis is defined as numerically predicting the soil responses and examining the breakwater foundation stability (i.e., liquefaction potential) under combined waves and currents loading within both poroelastic and poro-elastoplastic seabed foundation from both two- and three-dimensional perspectives for different engineering conditions. One of the main novel contributions of this study is to develop the integrated numerical model that make up for the deficiency of the fluid-seabed-structure interactions problems mentioned above: the wider application ranges including complicated 3D situations; the consideration of poro-elastoplastic soil behaviour and corresponding soil liquefaction; the inclusion of an advanced flow model to precisely predict the hydrodynamic behaviour around the structures. In the future, the models can be further developed and applied to practical engineering analyses, providing preliminary results for the design of the projects. The integrated numerical model consists of the flow sub-model, the seabed sub-model and the coupling module between two sub-models. The flow model is developed based on the Finite Volume Method (FVM) by solving the Volume-Averaged Reynolds Averaged Navier-Stokes (VARANS) equations for simulating the two incompressible phases (i.e., water and air) inside and outside the porous medium. The seabed model is governed by the dynamic Biot’s equations known as the u− p approximations, in which the relative displacements of pore fluid to soil particles are ignored and the acceleration of pore fluid and solid particles is included. Two constitutive models: poro-elastic model for oscillatory soil responses and momentary liquefaction; and poro-elastoplastic model for residual soil responses and residual liquefaction, are incorporated into the seabed model. An integration module is developed between flow sub-model and seabed sub-model through pressure continuity on the common faces. A set of validation works have been done to prove the capability of simulating the fluid-seabed-breakwater interactions in an accurate way. By adopting the integrated numerical model, three numerical studies have been conducted in this thesis, including one 2D study (soil responses around submerged breakwaters with Bragg reflection) and two 3D studies (seabed foundation stability around breakwaters at river mouth; seabed foundation stability around offshore detached breakwaters). A series of results, including the hydrodynamic properties of flow domain, variation of pore pressure, effective stresses and soil displacements, and characteristics of soil liquefaction within both poro-elastic and poro-elastoplastic seabed foundation have been obtained. Numerical results revealed that the construction of breakwaters can dramatically change the flow pattern and stress state in the vicinity, which will further affect the assessment of foundation stability. Besides, compared to the poro-elastic seabed foundation, the liquefaction is much easier to occur in the poro-elastoplastic seabed foundation and usually will develop to a much more significant level, which can cause critical failure of the structures. Furthermore, the effects of wave characteristics and soil properties on the breakwater foundation stability have been examined through parametric studies: the soil liquefaction is more serious within the loosely deposited seabed with poor drainage conditions under large wave height and wave period. It was also found that the currents have remarkable effects on foundation stability that aggravate with the increase of currents velocity.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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44

Callister, Eric V. "A Three-Dimensional, Time-Dependent Circulation Model of Utah Lake". DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/86.

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Spatial and temporal variations of Utah Lake’s flow field were modeled using the Estuary Lake and Computer Model from the Centre for Water Research (CWR-ELCOM) at the University of Western Australia as part of an effort to increase understanding of the lake’s natural processes in order to restore the lake to its pristine, clear-water state and preserve the habitat of the June sucker, an endangered species. The model was validated using temperature measurements taken by sensors in 2007. The water temperature was a strong function of air temperature and incident short wave radiation, and was influenced to a lesser degree by wind speed, wind direction, relative humidity, and cloud cover. The water currents were affected most strongly by wind speed and wind direction. The model also predicted the free drifting paths of June sucker larvae entering Utah Lake through the Provo and Spanish Fork Rivers between mid-April and July.

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45

Dodd, Thomas G. "Development of a three dimensional terrain display for a light infantry platoon combat model". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA247994.

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Thesis (M.S. in Systems Technology (Command, Control, and Communication))--Naval Postgraduate School, June 1990.
Thesis Advisor(s): Parry, Samuel H. Second Reader: Hoffman, James C. "June 1990." Description based on signature page as viewed on October 21, 2009. Page 21 is missing and not attainable. DTIC Identifier(s): Combat models. Author(s) subject terms: Three dimensional graphics display, combat model, DYNTACS terrain representation. Includes bibliographical references (p. 134-135). Also available online.

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46

Cameron, Heather M. "Constraint satisfaction for interactive 3-D model acquisition". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28937.

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More and more computer applications are using three-dimensional models for a variety of uses (e.g. CAD, graphics, recognition). A major bottleneck is the acquisition of these models. The easiest method for designing the models is to build them directly from images of the object being modelled. This paper describes the design of a system, MOLASYS (for MOdeL Acquisition SYStem), that allows the user to build object models interactively from underlying images. This would not only be easier for the user, but also more accurate as the models will be built directly satisfying the dimensions, shape, and other constraints present in the images. The object models are constructed by constraining model points and edges to match points in the image objects. The constraints are defined by the user and expressed using a Jacobian matrix of partial derivatives of the errors with respect to a set of camera and model parameters. MOLASYS then uses Newton's method to solve for corrections to the parameters that will reduce the errors specified in the constraints to zero. Thus the user describes how the system will change, and the program determines the best way to accomplish the desired changes. The above techniques, implemented in MOLASYS, have resulted in an intuitive and flexible tool for the interactive creation of three-dimensional models.
Science, Faculty of
Computer Science, Department of
Graduate

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47

Chang, Ka Kit. "Human model reconstruction from image sequence /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20CHANG.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 124-134). Also available in electronic version. Access restricted to campus users.

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48

Sorrentino, Rita. "Three dimensional oral mucosa models: development and applications". Doctoral thesis, Università del Piemonte Orientale, 2020. http://hdl.handle.net/11579/114910.

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Animal experimentation has been extensively and for a long time applied in several research fields, but since 2011 it has been substantially limited by the Commission of the European Parliament to ensure people/animals safety and reduce research costs. To respond to these directives, many attempts have been focused on the development and validation of new in vitro 3D systems, bypassing the traditional 2D cell cultures. In this regard, diverse approaches to tissue-engineered bone and oral mucosa have been developed. Despite the promising premises and the cutting-edge results, the used 3D in vitro bone-oral mucosal models still lack interaction between the mucosal and the bone components. Therefore, this project aimed to create 3D models, entirely made with primary human cells (keratinocytes, fibroblasts, and osteoblasts), able to mimic the natural structure and interaction of bone and oral mucosa. In the present work, the regulatory role of the mesenchymal tissue onto epithelia was evaluated. The main results showed that that during the differentiation hMSC produce and secrete factors that induce the keratinization and the expression of the marker of differentiation CK10; in particular in the middle stage of differentiation (OB14). The proteomic analysis revealed that this effect can be ascribable to KGF secretion. This finding may impact the design of new implantable devices able to induce, alone, the epithelial growth and keratinization to improve implant graft avoiding epithelial graft linked to the morbidity of another zone. Moreover, we also showed that OM might have a pro-innervation effect, at least during the last stages of keratinocytes stratification. Finally, we obtained and characterized an innervated mucoperiosteal model that could open new in vitro frontiers for oral biomaterials validation as well as improve knowledge regarding the mesenchymal stem cells roles onto oral mucosa development.

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49

Copploe, Antonio. "Bioengineered Three-dimensional Lung Airway Models to Study Exogenous Surfactant Delivery". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1505482360585247.

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50

Tsang, Moses T. "3-D finite element beam/connector model for a glulam dome cap". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09052009-040556/.

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Tesis sobre el tema "Three Dimensional Model"

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