subject:(Quasi dimensional)

Loughborough University

1. Lewis, Daniel. A quasi-dimensional spark ignition two stroke engine model.

Degree: PhD, 2014, Loughborough University

► Despite challenges with poor emissions and fuel economy, gasoline two stroke engines continue to be developed for a number of applications. The primary reasons for… (more)

▼ Despite challenges with poor emissions and fuel economy, gasoline two stroke engines continue to be developed for a number of applications. The primary reasons for the choice of a gasoline two stroke engine includes its low cost, mechanical simplicity and high specific power output. Some applications for the gasoline two stroke engine include small capacity motorcycles and scooters, off road recreational vehicles, hand held power tools and unmanned aerial vehicles. New technologies, which are already mature in four stroke engines, are now being applied to two stroke engines. Such technologies include direct fuel injection, electronic engine management and exhaust gas after treatment. To implement these new technologies computation models are being continuously developed to improve the design process of engines. Multi-dimensional computational fluid dynamics modelling is now commonly applied to engine research and development, it is a powerful tool that can give great insight into the thermofluid working of an engine. Multi-dimensional tools are however computationally expensive and quasi-dimensional modelling methods are often better suited for the analysis of an engine, for example in transient engine simulation. This thesis reports the development of a new quasi-dimensional combustion model for a loop scavenged two stroke engine. The model differs from other quasi-dimensional models available in the literature as it accounts for a bulk motion of the flame front due to the tumble motion created by the loop scavenge process. In this study the tumble motion is modelled as an ellipsoid vortex and the size of the vortex is defined by the combustion chamber height and a limiting elliptical aspect ratio. The limiting aspect ratio has been observed in experimental square piston compression machines and optical engines. The new model also accounts for a wrinkled flame brush thickness and its effects on the interaction between flame front and combustion chamber. The new combustion model has been validated against experimental engine tests in which the flame front propagation was measured using ionization probes. The probes were able determine the flame front shape, the bulk movement of the flame front due to tumble and also the wrinkled flame brush thickness.

Subjects/Keywords: 621.43; Two-Stroke; Engine; Comustion; Quasi-Dimensional

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APA (6^th Edition):

Lewis, D. (2014). A quasi-dimensional spark ignition two stroke engine model. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/14808

Chicago Manual of Style (16^th Edition):

Lewis, Daniel. “A quasi-dimensional spark ignition two stroke engine model.” 2014. Doctoral Dissertation, Loughborough University. Accessed March 03, 2021. http://hdl.handle.net/2134/14808.

MLA Handbook (7^th Edition):

Lewis, Daniel. “A quasi-dimensional spark ignition two stroke engine model.” 2014. Web. 03 Mar 2021.

Vancouver:

Lewis D. A quasi-dimensional spark ignition two stroke engine model. [Internet] [Doctoral dissertation]. Loughborough University; 2014. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/2134/14808.

Council of Science Editors:

Lewis D. A quasi-dimensional spark ignition two stroke engine model. [Doctoral Dissertation]. Loughborough University; 2014. Available from: http://hdl.handle.net/2134/14808

University of New South Wales

2. Gilbert, Alexander. Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation.

Degree: Mathematics & Statistics, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/60171 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51009/SOURCE2?view=true

► Approximating high and infinite dimensional integrals numerically is in general a very difficult problem. However, it is also one that arises in several applications from… (more)

▼ Approximating high and infinite dimensional integrals numerically is in general a very difficult problem. However, it is also one that arises in several applications from statistics, finance and uncertainty quantification, thus motivating a real need for the development and analysis of efficient algorithms. The difficulty lies in the fact that in general high-dimensional problems suffer from the curse of dimensionality where the cost of an approximation rises exponentially with dimension. However, knowing certain properties of the integrands allows one to identify problems that do not suffer from the curse and for which efficient algorithms can be developed. In this thesis we study numerical integration algorithms, specifically Quasi-Monte Carlo (QMC) quadrature rules and the Multivariate Decomposition Method (MDM), when bounds on the first mixed derivatives are known. The focus in this thesis is on analysis and development of algorithms, a new application for QMC methods from the field of uncertainty quantification and efficient strategies for implementing numerical integration algorithms.The main results of this thesis are as follows. First, we present a full error analysis for the application of QMC methods to approximate the expectation of the smallest eigenvalue of an elliptic differential operator with coefficients that are parametrised by infinitely-many stochastic variables. Eigenvalue problems are used to model many physical situations in engineering and the natural sciences, and this problem is motivated by uncertainty quantification of such problems. It also represents a new application for QMC methods. Second, we provide explicit details and numerical results on how to efficiently implement the Multivariate Decomposition Method (MDM) for approximating infinite-dimensional integrals. The third contribution of this thesis is a new method of constructing optimal active sets for use in the MDM. Finally, we present two user-friendly Component-by-Component algorithms for constructing QMC lattice rules, which automatically choose good function space weight parameters. In all cases we present numerical results that display the advantages of the algorithms, and where appropriate substantiate our corresponding theoretical results. Advisors/Committee Members: Kuo, Frances, Mathematics & Statistics, Faculty of Science, UNSW, Sloan, Ian, Mathematics & Statistics, Faculty of Science, UNSW.

Subjects/Keywords: High-dimensional integration; Numerical integration; Quasi-Monte Carlo; Infinite-dimensional integration

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APA (6^th Edition):

Gilbert, A. (2018). Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60171 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51009/SOURCE2?view=true

Chicago Manual of Style (16^th Edition):

Gilbert, Alexander. “Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation.” 2018. Doctoral Dissertation, University of New South Wales. Accessed March 03, 2021. http://handle.unsw.edu.au/1959.4/60171 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51009/SOURCE2?view=true.

MLA Handbook (7^th Edition):

Gilbert, Alexander. “Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation.” 2018. Web. 03 Mar 2021.

Vancouver:

Gilbert A. Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Mar 03]. Available from: http://handle.unsw.edu.au/1959.4/60171 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51009/SOURCE2?view=true.

Council of Science Editors:

Gilbert A. Algorithms for numerical integration in high and infinite dimensions: Analysis, applications and implementation. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60171 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51009/SOURCE2?view=true

Mississippi State University

3. Battalio, Joseph Michael. QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS.

Degree: MS, Geosciences, 2012, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-115157/ ;

► Quasi-geostrophic (QG) analysis of the atmosphere utilizes predefined isobaric surfaces to ascertain vertical motion. One equation of the QG system is the omega equation… (more)

Subjects/Keywords: vertical motion; Quasi-geostrophic theory; Three-dimensional visualization

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APA (6^th Edition):

Battalio, J. M. (2012). QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-115157/ ;

Chicago Manual of Style (16^th Edition):

Battalio, Joseph Michael. “QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS.” 2012. Masters Thesis, Mississippi State University. Accessed March 03, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-115157/ ;.

MLA Handbook (7^th Edition):

Battalio, Joseph Michael. “QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS.” 2012. Web. 03 Mar 2021.

Vancouver:

Battalio JM. QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS. [Internet] [Masters thesis]. Mississippi State University; 2012. [cited 2021 Mar 03]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-115157/ ;.

Council of Science Editors:

Battalio JM. QUANTITATIVE ANALYSIS AND 3D VISUALIZATION OF NWP DATA USING QUASI-GEOSTROPHIC EQUATIONS. [Masters Thesis]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-115157/ ;

University of Kansas

4. Tourani, Chandraprakash Chandra. COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS.

Degree: MS, Aerospace Engineering, 2011, University of Kansas

URL: http://hdl.handle.net/1808/7635

► 1-D simulations based on the quasi-one-dimensional equations of fluid motion plus an ignition delay model and 2-D numerical simulations based on Reynolds-Averaged Navier-Stokes (RANS) equations… (more)

Subjects/Keywords: Aerospace engineering; Air-breathing propulsion; Combustor; Hypersonic; Quasi one-dimensional; Scramjet

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APA (6^th Edition):

Tourani, C. C. (2011). COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/7635

Chicago Manual of Style (16^th Edition):

Tourani, Chandraprakash Chandra. “COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS.” 2011. Masters Thesis, University of Kansas. Accessed March 03, 2021. http://hdl.handle.net/1808/7635.

MLA Handbook (7^th Edition):

Tourani, Chandraprakash Chandra. “COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS.” 2011. Web. 03 Mar 2021.

Vancouver:

Tourani CC. COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS. [Internet] [Masters thesis]. University of Kansas; 2011. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/1808/7635.

Council of Science Editors:

Tourani CC. COMPUTATIONAL SIMULATION OF SCRAMJET COMBUSTORS - A COMPARISON BETWEEN QUASI-ONE DIMENSIONAL AND 2-D NUMERICAL SIMULATIONS. [Masters Thesis]. University of Kansas; 2011. Available from: http://hdl.handle.net/1808/7635

5. Altincicek, Furkan Muhammet. Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides.

Degree: MS, Physics & Astrophysics, 2019, University of North Dakota

URL: https://commons.und.edu/theses/2446

► Transition metal dichalcogenides (TMDs) are atomically thin semiconductors of the type MX2 with M being a transition metal and X being a chalcogen atom.… (more)

Subjects/Keywords: chromium (III) sulfide; chromium sulfide; Q2D; quasi-two-dimensional; TMC; transition metal chalcogenide

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APA (6^th Edition):

Altincicek, F. M. (2019). Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/2446

Chicago Manual of Style (16^th Edition):

Altincicek, Furkan Muhammet. “Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides.” 2019. Masters Thesis, University of North Dakota. Accessed March 03, 2021. https://commons.und.edu/theses/2446.

MLA Handbook (7^th Edition):

Altincicek, Furkan Muhammet. “Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides.” 2019. Web. 03 Mar 2021.

Vancouver:

Altincicek FM. Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides. [Internet] [Masters thesis]. University of North Dakota; 2019. [cited 2021 Mar 03]. Available from: https://commons.und.edu/theses/2446.

Council of Science Editors:

Altincicek FM. Synthesis And Characterization Of Quasi-Two-Dimensional Chromium Sulfides. [Masters Thesis]. University of North Dakota; 2019. Available from: https://commons.und.edu/theses/2446

Delft University of Technology

6. Moghadasi Barazandeh, Mohsen (author). Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8f4460c2-dd09-4b54-9a06-9cd6327cc69b

► Particle-laden internal turbulent flows are very commonplace, for example, in petrochemical flow lines, oil wells and so on. From an engineering view point, modelling such… (more)

▼ Particle-laden internal turbulent flows are very commonplace, for example, in petrochemical flow lines, oil wells and so on. From an engineering view point, modelling such flows in a 3D or even 2D fashion may not be reasonable in terms of computational cost, especially when the flow domain is sufficiently long, and a large number of grid cells are needed to resolve the flow field. On the other hand, ID models are quite fast but only take into account the stream-wise variations of the flow characteristics, without providing any information on their cross-sectional distribution. In this work, a novel quasi-ID modelling framework was introduced, which is able to capture the flow field in both stream-wise and cross-stream directions and yet stay computationally more efficient than the 3D or 2D models. The quasi-ID modelling framework was developed based on the one-way coupling of a RANS model for the single-phase turbulent flow with an Eulerian model for the transport of the dispersed particle phase. The nucleation, agglomeration and breakup events were also taken into considera¬tion through the generic population balance equation, the solution of which was provided using the direct quadrature method of moments. The results of the quasi-ID single-phase flow model were verified and shown to be in accordance with those of the AN SYS Fluent 2D model for different test cases. The computational cost analysis revealed that the simulation CPU time of the quasi-ID model increases linearly with the number of streamwise grid cells (Nx), whereas that of the 2D model scales with Nx1.6, implying that the quasi-ID model will perform faster than the 2D model from a certain number of grid cells on. The quasi-ID multi-phase-flow tool was then used to address the transport and deposition of asphaltenes in oil wells, as an example of particle-laden internal turbulent flows. To this end, a simulation test case was set up with several simplifications, and the results were compared with those of a simpler ID model in the literature, as the benchmark. Due to the lack of an appropriate model for the collision efficiency of asphaltene particles, a model associated with liquid droplets was adopted and tuned to obtain a match between the results of this study and the benchmark. The outcome of the sensitivity analysis demonstrated that the collision efficiency plays an important role in determining the asphaltenes deposition profile along the well bore and needs to be modeled accurately. Advisors/Committee Members: Portela, Luis (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Quasi-one-dimensional; Particle-laden flow; Asphaltenes; Population Balance; quadrature method of moments

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APA (6^th Edition):

Moghadasi Barazandeh, M. (. (2019). Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8f4460c2-dd09-4b54-9a06-9cd6327cc69b

Chicago Manual of Style (16^th Edition):

Moghadasi Barazandeh, Mohsen (author). “Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells.” 2019. Masters Thesis, Delft University of Technology. Accessed March 03, 2021. http://resolver.tudelft.nl/uuid:8f4460c2-dd09-4b54-9a06-9cd6327cc69b.

MLA Handbook (7^th Edition):

Moghadasi Barazandeh, Mohsen (author). “Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells.” 2019. Web. 03 Mar 2021.

Vancouver:

Moghadasi Barazandeh M(. Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 03]. Available from: http://resolver.tudelft.nl/uuid:8f4460c2-dd09-4b54-9a06-9cd6327cc69b.

Council of Science Editors:

Moghadasi Barazandeh M(. Quasi-1D Modelling of Particle-Laden Internal Turbulent Flows with Nucleation, Agglomeration and Breakup: Application to Asphaltenes Deposition in Oil Wells. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:8f4460c2-dd09-4b54-9a06-9cd6327cc69b

7. Saint, Brandon. The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea.

Degree: M.S. in Engineering Science, Civil Engineering, 2013, University of Mississippi

URL: https://egrove.olemiss.edu/etd/1294

► The protection of important infrastructure and vital resources of the United States is essential to the Nation's security. Attacks using the Nation's infrastructure as weapons… (more)

▼ The protection of important infrastructure and vital resources of the United States is essential to the Nation's security. Attacks using the Nation's infrastructure as weapons of mass destruction could have a disturbing physical and psychological consequences. Work needs to be done to enhance the protection of the Nation's infrastructure to prevent, deter, or mitigate the effects of deliberate attacks by terrorist. Toxic inhalation hazard (TIH) chemicals such as chlorine gas and anhydrous ammonia are very dangerous hazardous materials. Rail transportation of TIH creates risk that exposes highly populated areas across the country to this threat. This study investigates the ballistic resistance and self-sealing nature of a quasi 3D tri-axial woven composite layered with polyurea against high power rifle bullet impact. This is done by evaluating the effectiveness of quasi-3D tri-axial woven composites in resisting .50 caliber rifle rounds and utilizing a high speed camera to visually inspect the self-sealing behavior. The concept is to utilize the increase in delamination resistance of tri-axial quasi 3D woven fabrics in conjunction with the hyper-elasticity of polyurea to design an improved ballistic protection system with self-sealing properties. For comparison, a layer of basalt fiber composite will be used in conjunction with the tri-axial Q3D weave and polyurea. The addition of the basalt layer is to see if the shock wave of the impact will yield different results with the thicker and stiffer bi-axial plain weave layered basalt composite. The unique geometry of the quasi-3D tri-axial weave is that it is infinitely repeatable in its thickness direction. This repeatability is done without utilizing discrete ply or large crimp angles. The geometry of the weave allows for greater energy absorption compared to a standard weave. The result is a self-sealing coating that can be applied to railcar tankers or stationary tanks carrying toxic chemicals without increasing the weight or carrying capacity of the tanker. Advisors/Committee Members: Ahmed Al-Ostaz, Hunain Alkhateb, Ahmed Al-Ostaz.

Subjects/Keywords: Ballistic composite; polyurea; Quasi-3 Dimensional; self-sealing; Triaxial woven composite; woven composite; Engineering

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APA (6^th Edition):

Saint, B. (2013). The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea. (Thesis). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/1294

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Saint, Brandon. “The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea.” 2013. Thesis, University of Mississippi. Accessed March 03, 2021. https://egrove.olemiss.edu/etd/1294.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Saint, Brandon. “The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea.” 2013. Web. 03 Mar 2021.

Vancouver:

Saint B. The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea. [Internet] [Thesis]. University of Mississippi; 2013. [cited 2021 Mar 03]. Available from: https://egrove.olemiss.edu/etd/1294.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Saint B. The Manufacturing and Ballistic Testing of Tri-axial Quasi Three Dimensional Woven Composites Layered in Polyurea. [Thesis]. University of Mississippi; 2013. Available from: https://egrove.olemiss.edu/etd/1294

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Ong, Willie Chuin Hong. Spin Imbalanced Quasi-Two-Dimensional Fermi Gases .

Degree: 2015, Duke University

URL: http://hdl.handle.net/10161/10530

► Spin-imbalanced Fermi gases serve as a testbed for fundamental notions and are efficient table-top emulators of a variety of quantum matter ranging from neutron… (more)

Subjects/Keywords: Physics; Atomic physics; Quantum physics; Fermi gas; polaron; quasi-2D; Spin imbalance; Two Dimensional

11 more images…

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APA (6^th Edition):

Ong, W. C. H. (2015). Spin Imbalanced Quasi-Two-Dimensional Fermi Gases . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/10530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ong, Willie Chuin Hong. “Spin Imbalanced Quasi-Two-Dimensional Fermi Gases .” 2015. Thesis, Duke University. Accessed March 03, 2021. http://hdl.handle.net/10161/10530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ong, Willie Chuin Hong. “Spin Imbalanced Quasi-Two-Dimensional Fermi Gases .” 2015. Web. 03 Mar 2021.

Vancouver:

Ong WCH. Spin Imbalanced Quasi-Two-Dimensional Fermi Gases . [Internet] [Thesis]. Duke University; 2015. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/10161/10530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ong WCH. Spin Imbalanced Quasi-Two-Dimensional Fermi Gases . [Thesis]. Duke University; 2015. Available from: http://hdl.handle.net/10161/10530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

9. Tithof, Jeffrey. Novel methods of dimensionality reduction applied to a two-dimensional fluid flow.

Degree: PhD, Physics, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/58594

► Fluid turbulence is a ubiquitous phenomenon that has been called "the greatest unsolved problem in classical physics." Despite the fact that fluid flows are governed… (more)

▼ Fluid turbulence is a ubiquitous phenomenon that has been called "the greatest unsolved problem in classical physics." Despite the fact that fluid flows are governed by the deterministic Navier-Stokes equation, turbulence is notoriously difficult to predict. This difficulty largely arises because turbulence is chaotic (i.e., it exhibits extreme sensitivity to initial conditions) and has a very large number of degrees of freedom because of its continuous spatial dependence. However, a growing body of research suggests that turbulent dynamics are effectively low-dimensional, but it is not yet known how to optimally perform dimensionality reduction to capture the dynamically-relevant dimensions. In this dissertation, two dimensionality reduction methods are explored in the context of a quasi-two-dimensional (Q2D) fluid flow. This Q2D flow can be treated as effectively 2D, making the experimental and numerical aspects of the study more tractable than that of a fully three-dimensional flow. The first method involves the calculation of exact, unstable solutions of the Navier-Stokes equation, often called "exact coherent structures" (ECS). ECS exist in the same parameter regime as turbulence and play an important role in guiding the dynamics. In this work, experimental evidence for the existence and dynamical relevance of ECS is provided, as well as the first experimental demonstration of how ECS can be used to forecast weak turbulence. The second method, known as "persistent homology," provides a powerful mathematical formalism in which well-defined geometric features of a flow field are encoded in a so-called "persistence diagram." The results presented herein demonstrate how persistence diagrams can be used to characterize individual flow fields, make pairwise comparisons, and identify periodic dynamics. The substantial progress presented in this dissertation suggests that Q2D flows provide an excellent platform for testing new approaches to understanding turbulence. Advisors/Committee Members: Schatz, Michael F. (advisor), Mischaikow, Konstantin (committee member), Cvitanovic, Predrag (committee member), Wiesenfeld, Kurt (committee member), Yunker, Peter (committee member).

Subjects/Keywords: Kolmogorov flow; Quasi-two-dimensional; Exact coherent structures; Persistent homology; Dimensionality reduction; Dynamical systems; Turbulence

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APA (6^th Edition):

Tithof, J. (2016). Novel methods of dimensionality reduction applied to a two-dimensional fluid flow. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/58594

Chicago Manual of Style (16^th Edition):

Tithof, Jeffrey. “Novel methods of dimensionality reduction applied to a two-dimensional fluid flow.” 2016. Doctoral Dissertation, Georgia Tech. Accessed March 03, 2021. http://hdl.handle.net/1853/58594.

MLA Handbook (7^th Edition):

Tithof, Jeffrey. “Novel methods of dimensionality reduction applied to a two-dimensional fluid flow.” 2016. Web. 03 Mar 2021.

Vancouver:

Tithof J. Novel methods of dimensionality reduction applied to a two-dimensional fluid flow. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/1853/58594.

Council of Science Editors:

Tithof J. Novel methods of dimensionality reduction applied to a two-dimensional fluid flow. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/58594

University of Tennessee – Knoxville

10. Boylston, Brett Matthew. Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations.

Degree: MS, Aerospace Engineering, 2011, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/1058

► Simulations have been, and continue to play, an important role at the Arnold Engineering Development Center as an aid in control system development and… (more)

Subjects/Keywords: quasi-one-dimensional flow; facility simulation; real-time; control volume; simulink; AEDC

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APA (6^th Edition):

Boylston, B. M. (2011). Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/1058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Boylston, Brett Matthew. “Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations.” 2011. Thesis, University of Tennessee – Knoxville. Accessed March 03, 2021. https://trace.tennessee.edu/utk_gradthes/1058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Boylston, Brett Matthew. “Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations.” 2011. Web. 03 Mar 2021.

Vancouver:

Boylston BM. Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations. [Internet] [Thesis]. University of Tennessee – Knoxville; 2011. [cited 2021 Mar 03]. Available from: https://trace.tennessee.edu/utk_gradthes/1058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Boylston BM. Quasi-One-Dimensional Flow for Use in Real-Time Facility Simulations. [Thesis]. University of Tennessee – Knoxville; 2011. Available from: https://trace.tennessee.edu/utk_gradthes/1058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

McMaster University

11. Batalla, Erwin. Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆.

Degree: MSc, 1976, McMaster University

URL: http://hdl.handle.net/11375/15921

►

Optical reflectance of the quasi two dimensional compound Hg₂.₈₆AsF₆ has been investigated in the optical range, 0.5 to 4 eV. The spectra clearly show a… (more)

Subjects/Keywords: Optical reflectance; electrical measurements; quasi two dimensional compound

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APA (6^th Edition):

Batalla, E. (1976). Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/15921

Chicago Manual of Style (16^th Edition):

Batalla, Erwin. “Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆.” 1976. Masters Thesis, McMaster University. Accessed March 03, 2021. http://hdl.handle.net/11375/15921.

MLA Handbook (7^th Edition):

Batalla, Erwin. “Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆.” 1976. Web. 03 Mar 2021.

Vancouver:

Batalla E. Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆. [Internet] [Masters thesis]. McMaster University; 1976. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/11375/15921.

Council of Science Editors:

Batalla E. Anisotropic Optical Reflectance of Hg₂.₈₆AsF₆. [Masters Thesis]. McMaster University; 1976. Available from: http://hdl.handle.net/11375/15921

Freie Universität Berlin

12. Akram, Javed. Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen.

Degree: 2016, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-8021

► Die Fähigkeit, Atome in niedrigen Raumdimensionen mit Laserlicht fangen und manipulieren zu können, hat zu einer gewaltigen Entwicklung in der Erzeugung kohärenter Materiewellen im Bereich… (more)

▼ Die Fähigkeit, Atome in niedrigen Raumdimensionen mit Laserlicht fangen und manipulieren zu können, hat zu einer gewaltigen Entwicklung in der Erzeugung kohärenter Materiewellen im Bereich des aufkommenden Atomtronik-Gebietes geführt. Die vorliegende Doktorarbeit beinhaltet eine detaillierte theoretische Untersuchung von verschiedenen quasi-eindimensionalen Fallen im Hinblick darauf, wie sowohl statische als auch dynamische Eigenschaften gefangener Bose-Einstein-Kondensate (BEK) beeinflusst werden können. Abgesehen vom einleitenden Teil ist die Doktorarbeit in drei Teile gegliedert, die sukzessive aufeinander aufbauen. Im zweiten Teil der Doktorarbeit beschränken wir uns darauf, 87Rb-Atome in einer quasi-eindimensionalen Fallengeometrie zu untersuchen, die aus einer harmonischen Falle sowie einer rot- oder blau- verstimmten Gaußschen oder Hermite-Gaußschen Dimpelfalle besteht. Es handelt sich hierbei um eine erweiterte Falle, die kürzlich in Innsbruck verwandt wurde, um die Quantenentartung des ersten Strontium Bose-Einstein-Kondensates ohne die traditionelle Verdampfungskühlung zu erreichen. Nach der Erläuterung der Systemgeometrie vergleichen wir analytische und numerische Gleichgewichtsresultate und zeigen, dass die Falle entweder zu einer Beule oder einer Delle im Kondensat führt, abhängig davon, ob die Lasermode entweder rotoder blau-verstimmt ist. Verfolgt man die Expansionsdynamik des Kondensates, so zeigt sich, dass die Beule erhalten bleibt, während sich die Delle mit der Zeit verkleinert. Nachdem das rot- bzw. blau-verstimmte optische Dipolfallenpotential ausgeschaltet wird, entstehen Schockwellen bzw. graue (dunkle) Bi-Soliton-Züge, die mit einer charakteristischen Frequenz in der verbleibenden harmonischen Falle oszillieren. Es stellt sich heraus, dass die Erzeugung der Bi-Soliton-Züge ein generisches Phänomen darstellt, das auf Kollisionen des teilweise oder vollständig fragmentierten Bose-Einstein- Kondensates zurückzuführen ist. Es ist erstaunlich, dass die Form der erzeugten Solitonen in dem harmonisch gefangenen Bose-Einstein-Kondensat durch ein bestimmtes optischen Dipolfallenpotential bestimmt werden kann. Anschließend analysieren wir im zweiten Teil der Doktorarbeit ein quasi- eindimensionales Bose-Einstein-Kondensat in einer gravito-optischen Oberflächenfalle. Um solch ein nichtlineares Randwertproblem zu lösen, wenden wir das Spiegelprinzip an, das üblicherweise verwendet wird, um lineare Randwertprobleme zum Beispiel im Bereich der Elektrostatik zu behandeln. Durch Kombination analytischer und numerischer Resultate zeigen wir, dass sich die Kondensatwellenfunktion von einer Gauß- zu einer Dreiecksform verändert, wenn man die Atomzahl erhöht. Außerdem untersuchen wir numerisch im Detail zwei nicht-ballistische Expansionen einer BEK-Wolke unter dem Einfluß der Gravitation, wenn das evaneszente Fallenpotential ausgeschaltet wird. Im ersten Falle nehmen wir an, dass die Teilchen verloren gehen, wenn sie auf das Prisma auftreffen, so dass die Teilchenzahl in quantitativer Übereinstimmung mit einem… Advisors/Committee Members: [email protected] (contact), m (gender), Priv.-Doz. Dr. Axel Pelster (firstReferee), Prof. Dr. Jürgen Bosse (furtherReferee).

Subjects/Keywords: Bose-Einstein condensat; matter waves; quasi one-dimensional; quantum optics; Cs impurity; solitons; shock-waves; 500 Naturwissenschaften und Mathematik::530 Physik

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APA (6^th Edition):

Akram, J. (2016). Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-8021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Akram, Javed. “Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen.” 2016. Thesis, Freie Universität Berlin. Accessed March 03, 2021. http://dx.doi.org/10.17169/refubium-8021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Akram, Javed. “Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen.” 2016. Web. 03 Mar 2021.

Vancouver:

Akram J. Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen. [Internet] [Thesis]. Freie Universität Berlin; 2016. [cited 2021 Mar 03]. Available from: http://dx.doi.org/10.17169/refubium-8021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Akram J. Verformung eines quasi-eindimensionalen Bose-Einstein-Kondensats um kalibrierte Materiewellen zu erzeugen. [Thesis]. Freie Universität Berlin; 2016. Available from: http://dx.doi.org/10.17169/refubium-8021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Washington

13. Davis, Clayton. Solid Rocket Augmentation for Ram Accelerator Initial Launch.

Degree: 2019, University of Washington

URL: http://hdl.handle.net/1773/43623

► The ram accelerator is a hypervelocity launcher capable of speeds over 2 km/s and theoretically much higher. It operates by launching a projectile into a… (more)

Subjects/Keywords: internal ballistics; projectile; quasi-one-dimensional; ram accelerator; rocket; solid rocket; Aerospace engineering; Mechanical engineering; Aeronautics and astronautics

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APA (6^th Edition):

Davis, C. (2019). Solid Rocket Augmentation for Ram Accelerator Initial Launch. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/43623

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Davis, Clayton. “Solid Rocket Augmentation for Ram Accelerator Initial Launch.” 2019. Thesis, University of Washington. Accessed March 03, 2021. http://hdl.handle.net/1773/43623.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Davis, Clayton. “Solid Rocket Augmentation for Ram Accelerator Initial Launch.” 2019. Web. 03 Mar 2021.

Vancouver:

Davis C. Solid Rocket Augmentation for Ram Accelerator Initial Launch. [Internet] [Thesis]. University of Washington; 2019. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/1773/43623.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Davis C. Solid Rocket Augmentation for Ram Accelerator Initial Launch. [Thesis]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/43623

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Loughborough University

14. Johnson, Stephen. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.

Degree: PhD, 2012, Loughborough University

URL: http://hdl.handle.net/2134/10975

► A new quasi-dimensional, multi-zone model has been developed to describe the combustion processes occurring inside a dual fuel engine. A dual fuel engine is a… (more)

Subjects/Keywords: 621.402; Dual fuel; Quasi-dimensional; Multi-zone; Combustion; Modelling; Modeling; Packet model; Turbulent entrainment model; Methane

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APA (6^th Edition):

Johnson, S. (2012). A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/10975

Chicago Manual of Style (16^th Edition):

Johnson, Stephen. “A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.” 2012. Doctoral Dissertation, Loughborough University. Accessed March 03, 2021. http://hdl.handle.net/2134/10975.

MLA Handbook (7^th Edition):

Johnson, Stephen. “A quasi-dimensional model for performance and emissions predictions in a dual fuel engine.” 2012. Web. 03 Mar 2021.

Vancouver:

Johnson S. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. [Internet] [Doctoral dissertation]. Loughborough University; 2012. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/2134/10975.

Council of Science Editors:

Johnson S. A quasi-dimensional model for performance and emissions predictions in a dual fuel engine. [Doctoral Dissertation]. Loughborough University; 2012. Available from: http://hdl.handle.net/2134/10975

University of Illinois – Urbana-Champaign

15. Evangelista, Francisco, Jr. Three-dimensional modeling of failure in quasi-brittle materials and structures.

Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/29543

► In most serviceability conditions, concrete structures present quasi-brittle behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack… (more)

▼ In most serviceability conditions, concrete structures present quasi-brittle behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack front. Predictive models and design methodologies have to be able to reliably calculate the load capacity, or structural strength, of structures while taking into account the nonlinearity of the material behavior and the consideration of realistic boundary conditions such as geometry, size, and loading configuration. The main objective of this study is to develop models and to apply numerical tools to predict the cracking potential in three-dimensional concrete structures. Firstly, a cohesive zone model is formulated and implemented to simulate mode I crack growth in quasi-brittle materials based on the thermodynamics of irreversible processes allowing for loading, unloading, and re-loading. The model is a step forward to improve existing cohesive zone formulations to consider three-dimensional geometries and also overcome numerical instability, lack of convergence, and oscillations in the traction profile commonly reported in cohesive models. This study also explores the novel computational framework of the generalized finite element method (GFEM) to predict the potential for crack propagation in large scale problems such as three-dimensional airfield concrete slabs. A multi-scale approach, using the global-local concept within the GFEM framework (GFEMg-l), is applied to multi-site damage problems (MSD), where several crack geometries are placed simultaneously at different positions in a slab and loaded by different aircraft gears. This approach efficiently simulates multiple cracks not discretized in the global mesh, but only modeled in the local problem domains. The GFEMg-l enrichment functions allow the kinematics to be represented in the global domain through enrichment function from the local problems rather than explicitly modeling each crack discretely in the global domain. This research effort also proposes an integrated approach called nonlinear strength fracture model (NLSFM) to predict the structural strength or load capacity of three-dimensional concrete structures considering the structure geometry, loading configuration, and the nonlinearities ahead of the crack front. In this approach, the extraction of crack front quantities, such as stress intensity factors, are performed through finite element analysis, and then a high-order approximation based on the equivalent elastic crack approach for quasi-brittle materials accounts for the FPZ effects on the nominal strength of the structure under mode I fracture. The NLSFM uses the size- and shape-independent fracture properties defined through the critical energy release rate, Gf, and size of fracture process zone, c (as provided by the two-parameter fracture model and size effect model for quasi-brittle materials). As a result, the model predicts a material independent strength-curve, given the structural geometry, boundary conditions, loading, initial crack length are… Advisors/Committee Members: Roesler, Jeffery R. (advisor), Duarte, C. Armando (committee member), Al-Qadi, Imad L. (committee member), Lambros, John (committee member).

Subjects/Keywords: fracture mechanics, cohesive zone model; quasi-brittle materials, concrete materials; three-dimensional modeling; multi-scale modeling

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APA (6^th Edition):

Evangelista, Francisco, J. (2012). Three-dimensional modeling of failure in quasi-brittle materials and structures. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29543

Chicago Manual of Style (16^th Edition):

Evangelista, Francisco, Jr. “Three-dimensional modeling of failure in quasi-brittle materials and structures.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 03, 2021. http://hdl.handle.net/2142/29543.

MLA Handbook (7^th Edition):

Evangelista, Francisco, Jr. “Three-dimensional modeling of failure in quasi-brittle materials and structures.” 2012. Web. 03 Mar 2021.

Vancouver:

Evangelista, Francisco J. Three-dimensional modeling of failure in quasi-brittle materials and structures. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/2142/29543.

Council of Science Editors:

Evangelista, Francisco J. Three-dimensional modeling of failure in quasi-brittle materials and structures. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29543

Georgia Tech

16. Suri, Balachandra. Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures.

Degree: PhD, Physics, 2017, Georgia Tech

URL: http://hdl.handle.net/1853/60177

► Fluid turbulence is nearly ubiquitous in natural and human-made systems. Despite systematic research for over hundred years, scientists are still searching for efficient ways to… (more)

▼ Fluid turbulence is nearly ubiquitous in natural and human-made systems. Despite systematic research for over hundred years, scientists are still searching for efficient ways to forecast and control the evolution of turbulent flows. The research presented in this thesis tests and extends recent ideas aimed at developing a simplified description of turbulent evolution, with the final goal being its efficient forecasting and control. The underlying methodology includes identifying ``Exact Coherent Structures'' (ECS), which are unstable, nonchaotic solutions of the Navier-Stokes equation that describes the evolution of fluid flows. While ECS are observed only fleetingly in turbulence, they display relatively simple spatiotemporal features. Hence, being more tractable to analysis than turbulence, ECS may serve as simple building blocks in developing a simplified description of turbulent evolution. The present study explores the role of ECS in turbulence generated in a shallow electrolyte layer which is driven using a horizontal electromagnetic force with a sinusoidal spatial profile. The flow in the experiment, often termed quasi-two-dimensional (Q2D) Kolmogorov Flow, is nearly horizontal. The Q2D flow is described theoretically using a strictly 2D model, which is validated by showing quantitative agreement between its numerical simulation and the experiment in the comparison of pre-turbulent flow states and the transitions between them. Analyzing the dynamics in the weakly turbulent regime, it is identified that dramatic slowing-down in the evolution of the flow is related to turbulent trajectories in the state space visiting the neighborhoods of unstable equilibrium solutions, a class of ECS. The dynamical role of ECS is validated by showing that turbulent trajectories in the neighborhood of an unstable equiliurbium depart following its unstable manifold. Hence, turbulent evolution in the neighborhood of the equilibrium can be forecast by constructing its unstable manifold, which is demonstrated using both the experiment and simulations. This study offers unambiguous experimental evidence for the dynamical role of ECS in turbulence, as well as the first ECS based forecasting of turbulent evolution. Advisors/Committee Members: Schatz, Michael F. (advisor), Grigoriev, Roman O. (advisor), Cvitanovic, Predrag (committee member), Wiesenfeld, Kurt (committee member), Paul, Mark (committee member).

Subjects/Keywords: Turbulence; Quasi-two-dimensional flow; Kolmogorov flow; Magnetohydrodynamics; Bifurcations; Symmetry-breaking; Geophysical flows; Exact coherent structures; Dynamical systems

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APA (6^th Edition):

Suri, B. (2017). Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60177

Chicago Manual of Style (16^th Edition):

Suri, Balachandra. “Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures.” 2017. Doctoral Dissertation, Georgia Tech. Accessed March 03, 2021. http://hdl.handle.net/1853/60177.

MLA Handbook (7^th Edition):

Suri, Balachandra. “Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures.” 2017. Web. 03 Mar 2021.

Vancouver:

Suri B. Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/1853/60177.

Council of Science Editors:

Suri B. Quasi-two-dimensional Kolmogorov flow: Bifurcations and exact coherent structures. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/60177

University of Arkansas

17. Andharia, Eesha Sanjay. Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains.

Degree: MS, 2018, University of Arkansas

URL: https://scholarworks.uark.edu/etd/3045

► The high exciton binding energy in one dimensional (1D) nano-structures makes them prominent for optoelectronic device applications, making it relevant to theoretically investigate their… (more)

Subjects/Keywords: 1 Dimensional; DFT; Exciton; GW-BSE; Nano wires; Quasi-Particle; Engineering Physics; Nanoscience and Nanotechnology; Optics

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APA (6^th Edition):

Andharia, E. S. (2018). Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/3045

Chicago Manual of Style (16^th Edition):

Andharia, Eesha Sanjay. “Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains.” 2018. Masters Thesis, University of Arkansas. Accessed March 03, 2021. https://scholarworks.uark.edu/etd/3045.

MLA Handbook (7^th Edition):

Andharia, Eesha Sanjay. “Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains.” 2018. Web. 03 Mar 2021.

Vancouver:

Andharia ES. Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains. [Internet] [Masters thesis]. University of Arkansas; 2018. [cited 2021 Mar 03]. Available from: https://scholarworks.uark.edu/etd/3045.

Council of Science Editors:

Andharia ES. Quasi-Particle Band Structure and Excitonic Effects in One-Dimensional Atomic Chains. [Masters Thesis]. University of Arkansas; 2018. Available from: https://scholarworks.uark.edu/etd/3045

University of Texas – Austin

18. -1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.

Degree: PhD, Mechanical Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/68397

► A research team developed the University of Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on Texas… (more)

▼ A research team developed the University of Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on Texas roads. One of the objectives of the model was to be as flexible as possible in order to be capable of simulating a variety of vehicles, payloads, and traffic conditions. For heavy-duty vehicles, there are no prescribed driving cycles, there are no coastdown coefficients available from the EPA, and we relied on experimental brake specific fuel consumption maps for a few heavy-duty diesel engines. Heavy-duty vehicle drive cycles highly depend upon the vehicle load, the grade of the road, the engine size, and the traffic conditions. In order to capture real driving conditions 54 drive cycles with three different Class 8 trucks, three weight configurations, three traffic congestion levels, and two drivers are collected. Drive cycles obtained in this research include road grade and vehicle speed data with time. Due to the lack of data from EPA for calculating the road load force for heavy-duty vehicles, coastdown tests were performed. To generate generic fuel maps for the fuel economy model, a direct injection quasi-dimensional diesel engine model was developed based on in-cylinder images available in the literature. Sandia National Laboratory researchers obtained various images describing diesel spray evolution, spray mixing, premixed combustion, mixing controlled combustion, soot formation, and NOx formation via imaging technologies. Dec combined all of the available images to develop a conceptual diesel combustion model to describe diesel combustion from the start of injection up to the quasi-steady form of the jet. The end of injection behavior was left undescribed in this conceptual model because no clear image was available due to the chaotic behavior of diesel combustion. A conceptual end-of-injection diesel combustion behavior model was proposed to capture diesel combustion in its life span. A full-cycle quasi-dimensional direct injection diesel engine model was developed that represents the physical models, utilizing the conceptual model developed from imaging experiments and available experiment-based spray models, of the in-cylinder processes. The compression, expansion, and gas exchange stages are modeled via zero-dimensional single zone calculations. A full cycle simulation is necessary in order to capture the initial conditions of the closed section of the cycle and predict the brake specific fuel consumption accurately. Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew John (advisor), Ellzey, Janet L. (committee member), Ezekoye, Ofodike A. (committee member), Biros, George (committee member), Roberts, Charles E. (committee member).

Subjects/Keywords: Quasi-dimensional; Diesel; Engine; Heavy-duty; Direct injection; Numerical; Modeling; Combustion; Coastdown; Drive cycle; Fuel economy; Mathematical; Vehicle; Simulation; Class 8

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APA (6^th Edition):

-1322-3556. (2018). Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68397

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed March 03, 2021. http://hdl.handle.net/2152/68397.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Web. 03 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/2152/68397.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68397

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

19. Debnath, Bishwajit. Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials.

Degree: Electrical Engineering, 2018, University of California – Riverside

URL: http://www.escholarship.org/uc/item/3wk7g9tv

► We explore the excitonic, electronic, phononic and thermal properties of low-dimensional materials, specifically the two-dimensional and quasi-one-dimensional transition metal chalcogenides. The possibility of observing Bose-Einstein… (more)

▼ We explore the excitonic, electronic, phononic and thermal properties of low-dimensional materials, specifically the two-dimensional and quasi-one-dimensional transition metal chalcogenides. The possibility of observing Bose-Einstein exciton condensation (BEC) in transition metal dichalcogenides (TMDs) has been analyzed at three different levels of theory. We find that, in the strong coupling regime, mean field theory with either an unscreened or screened interlayer interaction predicts a room-temperature condensate. However, intralayer interactions can essentially renormalize the quasiparticle dispersion, which can be captured by many-body GW formalism. In the strong coupling regime, the improved BEC theory predicts that intralayer interactions have a large impact on the condensate order parameter, as well as on its functional dependencies on effective mass and carrier density. We also explore the thermal properties of 2D materials, specifically in the misoriented bilayer graphene (m-BLG) system, using ab initio density functional theory (DFT) and phonon Boltzmann transport equation (BTE). we find that the lattice thermal conductivity of m-BLG reduces to almost half of its unrotated counterpart. To explain the phonon dynamics, we analyze the phonon dispersions, phonon velocity distributions, occupations, density of states and heat capacity, both before and after misorientation. Detailed calculation of the phonon-phonon scattering lifetime reveals that, the increased umklapp scattering in the acoustic and quasi-acoustic phonon branches is the main reason for the reduced thermal conductivity in m-BLG system. We also explore the thermal conductivity of quasi-1D materials, specifically TaSe3 and NbS3, using ab initio DFT and phonon BTE. We find that both materials exhibit highly anisotropic thermal transport. A thermal conductivity of 6.3 W/mK (70.6 W/mK) is observed for metallic TaSe3 (semiconducting NbS3) along the chain direction. In-depth study of velocity and lifetime distribution shows that lower scattering and higher phonon velocity in NbS3 are the reasons behind such higher thermal conductivity. The umklapp scattering process is found to be the dominant phonon scattering mechanism in this family of low-dimensional materials. We also investigate the electronic and vibrational properties of different phases of the quasi-1D material NbS3. We find that the dimerized phase NbS3-IV is a semiconductor, whereas the undimerized phase NbS3-V is a metal. Similarity between the band dispersions of phase-I and phase-IV arises from the similarity in their structures, in spite of some stacking and chiral faults. Both phase-I and phase-IV are dynamically stable, whereas the phonon dispersion in phase-V exhibits instability along the inter-chain and growth direction, indicating a possible charge density wave ground state. Finally, we explore the band alignment properties of different quasi-1D transition metal trichalcogenides (TMTs). From the DFT calculations, we can identify several TMTs as promising candidates for ohmic…

Subjects/Keywords: Electrical engineering; Nanotechnology; Materials Science; ab initio thermal conductivity; Bose Einstein condensate; Density functional theory; Phonon dispersion; Quasi one dimensional material; Twisted Bilayer Graphene

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APA (6^th Edition):

Debnath, B. (2018). Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/3wk7g9tv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Debnath, Bishwajit. “Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials.” 2018. Thesis, University of California – Riverside. Accessed March 03, 2021. http://www.escholarship.org/uc/item/3wk7g9tv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Debnath, Bishwajit. “Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials.” 2018. Web. 03 Mar 2021.

Vancouver:

Debnath B. Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials. [Internet] [Thesis]. University of California – Riverside; 2018. [cited 2021 Mar 03]. Available from: http://www.escholarship.org/uc/item/3wk7g9tv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Debnath B. Investigation of Excitonic, Electronic and Thermal Properties of Two-Dimensional and Quasi-One-Dimensional Materials. [Thesis]. University of California – Riverside; 2018. Available from: http://www.escholarship.org/uc/item/3wk7g9tv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oxford

20. Franke, Isabel. Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields.

Degree: PhD, 2011, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558386

► This thesis presents the investigation of magnetism in a selection of low-dimensional systems and its relation to other physical properties, such as superconductivity. The techniques… (more)

Subjects/Keywords: 538; Condensed Matter Physics; Co-ordination chemistry; magnetism; superconductivity; muon spin rotation; high magnetic fields; coordination polymers; transition metal oxides; quasi-low-dimensional systems

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Franke, I. (2011). Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558386

Chicago Manual of Style (16^th Edition):

Franke, Isabel. “Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields.” 2011. Doctoral Dissertation, University of Oxford. Accessed March 03, 2021. http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558386.

MLA Handbook (7^th Edition):

Franke, Isabel. “Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields.” 2011. Web. 03 Mar 2021.

Vancouver:

Franke I. Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields. [Internet] [Doctoral dissertation]. University of Oxford; 2011. [cited 2021 Mar 03]. Available from: http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558386.

Council of Science Editors:

Franke I. Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields. [Doctoral Dissertation]. University of Oxford; 2011. Available from: http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558386

University of St. Andrews

21. Notbohm, Susanne. Spin dynamics of quantum spin-ladders and chains .

Degree: 2007, University of St. Andrews

URL: http://hdl.handle.net/10023/403

► This thesis describes the neutron scattering measurements of magnetic excitations in spin-chains and ladders. The first part discusses an experimental investigation of the copper oxide… (more)

▼ This thesis describes the neutron scattering measurements of magnetic excitations in spin-chains and ladders. The first part discusses an experimental investigation of the copper oxide family Srâ â Cuâ â Oâ â composed of edge-sharing chains and spin-ladders. The study of Laâ Srâ â Cuâ â Oâ â comprises a slightly hole-doped chain and an undoped ladder structure where the chain can be modeled by a ferromagnetic nearest and an antiferromagnetic next-nearest neighbor coupling. The hole effects are apparent in gaps in the dispersion relation and can be described by a charge-density wave agreeing with the commensuration of the dispersion. Investigating the undoped ladder establishes the exchange constants including a cyclic exchange manifested by the two-magnon continuum and the suppression of the S = 1 bound mode. An orbital consideration provides an explanation for the exchanges including the different sizes of rung and leg coupling. The excitation spectrum of the doped ladder in Caâ .â Srâ â .â Cuâ â Oâ â can be described by a direct comparison with the undoped ladder and the differences consisting of a higher energy mode and subgap scattering can be successfully modeled by the charge spectrum of the ladder calculated from the free electron model. The second part of the thesis investigates the alternating chain material Cu(NOâ )â Â· 2.5D2O and establishes the gapped one-magnon dispersion, the two-magnon continuum and for the first time the S =1 bound mode. Applying magnetic field drives the system through two critical field transitions, condensation of magnons into the ground state and saturation. The modes beyond saturation can be modeled by spin wave theory and the excitations at the first critical field follow Luttinger Liquid behavior. Additionally investigated are the temperature effects with the excitations being of a different nature but containing the signature of a strong correlated system. For an outlook the measurements including temperature and field are provided with further theoretical descriptions necessary. Advisors/Committee Members: Lee, Stephen (advisor), Tennant, David Alan (advisor).

Subjects/Keywords: Quantum magnets; Quasi one-dimensional system; Hole-doping effects; Strong correlation

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APA (6^th Edition):

Notbohm, S. (2007). Spin dynamics of quantum spin-ladders and chains . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Notbohm, Susanne. “Spin dynamics of quantum spin-ladders and chains .” 2007. Thesis, University of St. Andrews. Accessed March 03, 2021. http://hdl.handle.net/10023/403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Notbohm, Susanne. “Spin dynamics of quantum spin-ladders and chains .” 2007. Web. 03 Mar 2021.

Vancouver:

Notbohm S. Spin dynamics of quantum spin-ladders and chains . [Internet] [Thesis]. University of St. Andrews; 2007. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/10023/403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Notbohm S. Spin dynamics of quantum spin-ladders and chains . [Thesis]. University of St. Andrews; 2007. Available from: http://hdl.handle.net/10023/403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Kilpatrick, Torin Brett. Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy.

Degree: MS, Electrical & Computer Engr, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/78515

► This thesis describes the study of the quasi-one-dimensional material orthorhombic tantalum trisulfide. TaS3 and other transition metal trichalcogenides have been studied extensively because of their… (more)

Subjects/Keywords: Tantalum Trisulfide; Scanning Tunneling Microscopy; Quasi-One-Dimensional Materials

…of as a quasi-‐ one-‐dimensional structure. While the basic… …one-‐dimensional Fermi surface. The authors explained the Peierls… …transition as an effect caused by the one-‐ dimensional nature of… …dimensional crystal structure becomes distorted (Peierls distortion)… …the one-‐dimensional behavior of the material. This behavior…

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APA (6^th Edition):

Kilpatrick, T. B. (2015). Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78515

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kilpatrick, Torin Brett. “Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy.” 2015. Thesis, University of Illinois – Urbana-Champaign. Accessed March 03, 2021. http://hdl.handle.net/2142/78515.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kilpatrick, Torin Brett. “Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy.” 2015. Web. 03 Mar 2021.

Vancouver:

Kilpatrick TB. Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/2142/78515.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kilpatrick TB. Investigation of quasi-one-dimensional orthorhombic tantalum trisulfide using scanning tunneling microscopy. [Thesis]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78515

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Zhang, Yingyi. Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas .

Degree: 2013, Duke University

URL: http://hdl.handle.net/10161/7136

► This dissertation presents the first experiments on radio frequency (rf) spectroscopy of a quasi-two dimensional strongly interacting ultracold atomic Fermi gas. A 50-50 mixture… (more)

Subjects/Keywords: Physics; Quasi-two dimensional; Radio frequency spectroscopy; ultracold Fermi gas

…a quasi-two dimensional ultracold strongly interacting Fermi gas, which contains a 50-50… …a quasi-two dimensional Fermi gas [4]. Our experiments have spurred several… …eﬀects. Our group chose a quasi-two dimensional system since it plays a pivotal role in quantum… …x5D;. We focused on directly observing the pairing energy in this quasi-two dimensional… …show 13 large discrepancies from the dimer theory in quasi-two dimensional system [4…

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APA (6^th Edition):

Zhang, Y. (2013). Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/7136

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Yingyi. “Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas .” 2013. Thesis, Duke University. Accessed March 03, 2021. http://hdl.handle.net/10161/7136.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Yingyi. “Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas .” 2013. Web. 03 Mar 2021.

Vancouver:

Zhang Y. Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas . [Internet] [Thesis]. Duke University; 2013. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/10161/7136.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang Y. Radio Frequency Spectroscopy Of a Quasi-Two-Dimensional Fermi Gas . [Thesis]. Duke University; 2013. Available from: http://hdl.handle.net/10161/7136

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Kentucky

24. Rai, Ram C. ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS.

Degree: 2004, University of Kentucky

URL: https://uknowledge.uky.edu/gradschool_diss/427

► A searched for narrow-band-noise (NBN) modulations of the infrared transmission in blue bronze has been performed. No modulations were observed, giving an upper limits for… (more)

▼ A searched for narrow-band-noise (NBN) modulations of the infrared transmission in blue bronze has been performed. No modulations were observed, giving an upper limits for NBN changes in the absorption coefficient of )2000/(/3.0.andlt;.cmNBN. The implication of these results on proposed CDW properties and NBN mechanisms are discussed. An infrared microscope with a capability of doing both reflectance and transmission measurements has been integrated into the previous electro-transmission system with tunable diode lasers. Electro-optic experiments were done using the microscope for the studies of the CDW states of K0.3MoO3 (blue bronze) and orthorhombic TaS3. The electro-reflectance signal for blue bronze has been evidenced for the first time. The infrared reflectance of K0.3MoO3 varied with position when a voltage greater than the CDW depinning threshold is applied. The spatial dependence of .R/R was slightly different than for ./, in that the magnitude of .R/R decreased and, for low voltages and frequencies, the signal became inverted near the contacts. Perhaps the differences might be associated with changes in the CDW properties on the surface. For blue bronze, the electro-reflectance signal was measured to be smaller than electro-transmittance signal by one order of magnitude for light polarized transverse to the chain direction, while the electro-reflectance signal for parallel polarized light was found to be a few times smaller than for transverse polarized light. The fits of the electro-reflectance spectrum showed that the changes in background dielectric constant were ~ 0.05 % and/or oscillator strength and/or frequency shifts of the phonons were ~ 0.05 % and ~ 0.005 cm-1 in the applied electric field. We also found that parallel polarized phonons are affected by CDW strain, and these changes dominate the electro-reflectance spectrum. We have examined the electro-reflectance spectra associated with CDW current investigation for light polarized parallel to the conducting chains for signs of expected current-induced intragap states, and conclude that the density of any such states is at most a few times less than expected. We have observed a large (~1%) change in infrared reflectance of orthorhombic TaS3, when its CDW is depinned. The change is concentrated near one current contact. Assuming that the change in reflectance is proportional to the degree of CDW polarization, we have studied the dynamics of CDW repolarization through position dependent measurements of the variation of the electro-reflectance with the frequency of square wave voltages applied to the sample, and have found that the response could be characterized as a damped harmonic oscillator with a distribution of relaxation (i.e. damping) times. The average relaxation time, which increases away from the contacts, varies with applied voltage as with p ~ 3/2, but the distribution of times broadens as the voltage approaches the depinning threshold. Very low resonant frequencies (~ 1 kHz) indicate a surprisingly large amount of inertia, which is…

Subjects/Keywords: Quasi-One-Dimensional; Charge-Density-Waves; Electro-Optic Effect; IR Spectrum; Polarization Dynamics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rai, R. C. (2004). ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/gradschool_diss/427

Chicago Manual of Style (16^th Edition):

Rai, Ram C. “ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS.” 2004. Doctoral Dissertation, University of Kentucky. Accessed March 03, 2021. https://uknowledge.uky.edu/gradschool_diss/427.

MLA Handbook (7^th Edition):

Rai, Ram C. “ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS.” 2004. Web. 03 Mar 2021.

Vancouver:

Rai RC. ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS. [Internet] [Doctoral dissertation]. University of Kentucky; 2004. [cited 2021 Mar 03]. Available from: https://uknowledge.uky.edu/gradschool_diss/427.

Council of Science Editors:

Rai RC. ELECTRO-OPTICAL STUDIES OF CHARGE-DENSITY-WAVE MATERIALS. [Doctoral Dissertation]. University of Kentucky; 2004. Available from: https://uknowledge.uky.edu/gradschool_diss/427

INP Toulouse

25. Hamdi, Bilel. Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus.

Degree: Docteur es, Micro-ondes, Électromagnétisme et Optoélectronique, 2015, INP Toulouse

URL: http://www.theses.fr/2015INPT0150

►

Les réseaux d’antennes planaires sont réputés par leur grande directivité et leur facilité de mise en œuvre qui offre la possibilité d’avoir un diagramme de… (more)

▼

Les réseaux d’antennes planaires sont réputés par leur grande directivité et leur facilité de mise en œuvre qui offre la possibilité d’avoir un diagramme de rayonnement commandable. Cependant l’étude globale tenant compte des différents couplages EM par une théorie électromagnétique rigoureuse nécessite un espace mémoire important et un temps de calcul considérable. Pour surmonter à ces inconvénients, nous proposons d’introduire une nouvelle approche théorique basée sur le théorème de Floquet permettant la réduction du volume d’analyse EM au niveau d’une seule cellule élémentaire. Nous allons focaliser notre étude à la détermination des termes de couplage dans une configuration répartie dans une trame presque-périodique et en particulier pour les réseaux d’antennes périodiques et quasi-périodiques alimentés par des sources arbitraires. Dans ce cas, nous utiliserons les décompositions en modes de Floquet (adaptées aux structures périodiques) pour extraire la matrice de couplage [S]. Ces décompositions sont des concepts établis de longue date et a priori démontrés par de supports théoriques solides. Par conséquent, cette analyse modale permet de simplifier la résolution du problème considéré surtout quand les éléments rayonnants sont fortement couplés. Une seule méthode numérique est adoptée afin de modéliser la structure proposée : la méthode des moments combinée avec le circuit équivalent généralisé : MoM-GEC. La validation de cette dernière sera réalisée par comparaison avec d’autres méthodes numériques exactes

Planar antenna arrays are renowned for their high directivity and ease of implementation, which offers the possibility of having a controllable radiation pattern. However the global study taking into account the different EM couplings by a rigorous electromagnetic theory requires a large memory space and a considerable computation time. To overcome these drawbacks, we propose to introduce a new theoretical approach based on the Floquet theorem allowing the reduction of the EM analysis volume at the level of a single elementary cell (basic cell). We will focus our study on the determination of coupling terms in a distributed configuration in an almost-periodic frame and in particular for periodic and quasi-periodic antenna arrays fed by arbitrary sources. In this case, we will use Floquet mode decompositions (adapted to periodic structures) to extract the coupling matrix [S]. These decompositions are concepts established for a long time and a priori demonstrated by solid theoretical supports. Consequently, this modal analysis makes it possible to simplify considerably the resolution of the problem, especially when the radiating elements are strongly coupled. A single numerical method is adopted in order to model the proposed structure: the method of moments combined with the generalized equivalent circuit: MoM-GEC. Validation of the latter will be done by comparison with other exact numerical methods.

Advisors/Committee Members: Tao, Junwu (thesis director), Aguili, Toufik (thesis director).

Subjects/Keywords: Analyse de Floquet; Murs périodiques; Méthode des moments; Circuits équivalents généralisés; Couplage mutuel; Paramètres S; Réseaux uni dimensionnelle; Réseaux Bi dimensionnelle; Structure fini; Structure infini; Réseaux presque-périodiques; Réseaux quasi-périodiques; Floquet analysis; Periodic walls; Moment method; Generalized equivalent circuits; Mutual coupling; S-Parameters; Uni-dimensional networks; Bi-dimensional networks; Finite structure; Infinite structure; Almost periodic networks; Quasi-periodic networks

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hamdi, B. (2015). Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2015INPT0150

Chicago Manual of Style (16^th Edition):

Hamdi, Bilel. “Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus.” 2015. Doctoral Dissertation, INP Toulouse. Accessed March 03, 2021. http://www.theses.fr/2015INPT0150.

MLA Handbook (7^th Edition):

Hamdi, Bilel. “Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus.” 2015. Web. 03 Mar 2021.

Vancouver:

Hamdi B. Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus. [Internet] [Doctoral dissertation]. INP Toulouse; 2015. [cited 2021 Mar 03]. Available from: http://www.theses.fr/2015INPT0150.

Council of Science Editors:

Hamdi B. Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires : Optimization of UPS lighting systems based on DC low voltage bus. [Doctoral Dissertation]. INP Toulouse; 2015. Available from: http://www.theses.fr/2015INPT0150

26. Orf, Lazhar El. Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study.

Degree: Docteur es, Sciences de gestion, 2012, Paris, CNAM

URL: http://www.theses.fr/2012CNAM0832

►

L’objectif de notre thèse est de comprendre et d’expliquer les modes d’intégration des systèmes comptables des entreprises à partir de quatre cas (deux grandes entreprises… (more)

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L’objectif de notre thèse est de comprendre et d’expliquer les modes d’intégration des systèmes comptables des entreprises à partir de quatre cas (deux grandes entreprises et deux entreprises moyennes). Nous nous sommes appuyés sur la théorie de la différenciation-intégration de Lawrence et Lorsch (1967) pour interpréter les situations d’intégration étudiées. Cette théorie montre que les entreprises ayant des structures très différenciées disposent des mécanismes d’intégration sophistiqués tandis que celles dont les structures sont peu différenciées ont des mécanismes de coordination rudimentaires. Nous avons également mobilisé l’approche événementielle et multidimensionnelle de Sorter (1969) qui propose un cadre théorique de l’intégration informatico-comptable. Les progiciels ERP constituent une application très concrète de cette approche. Notre analyse qualitative de quatre cas en termes de similitudes et de différences, appuyée sur la théorie de la différenciation-intégration, a permis d’expliquer les situations d’intégration des sous-systèmes comptables observées mais aussi de montrer la pertinence de l’approche événementielle, comme cadre de conception du système d’information de structures diversifiées et différenciées. Nos résultats montrent, à l’instar de Lawrence et Lorsch, qu’il existe des modes différents d’intégration des systèmes comptables adaptés à des contextes différents. Nous avons ébauché une typologie de quatre configurations types des systèmes comptables (quatre situations d’intégration-différenciation) : (1) Système classique bidimensionnel, (2) Système quasi-intégré centralisé, (3) Système intégré, (4) Système multidimensionnel. La stratégie et la taille paraissent être, au-delà de toutes autres considérations, les principaux déterminants de l’intégration comptable ; viennent ensuite, l’environnement et certains autres éléments du contexte tels que la structure de gestion et le système de contrôle. Cependant, l’impact de la taille diffère d’une entreprise à l’autre. Lorsque la taille est combinée à une stratégie de diversification (et par extension à des environnements variés et dynamiques) son effet différenciateur sur l’organisation (et le système comptable) est très important, ce qui nécessite des mécanismes compensateurs d’intégration développés. Les deux entreprises diversifiées (POULINA et MEDDEB) ont mis en place un système comptable intégré voire multidimensionnel pour maitriser leurs sous-systèmes différenciés. Lorsque la taille est la conséquence d’un simple développement d’une activité unique (monoactivité) son effet différenciateur-intégrateur sur l’organisation et le système comptable est moins important. Les deux entreprises ayant des activités et des structures homogènes (SONEDE et SME) se sont contentées d’un système comptable peu intégré voire bidimensionnel.

The objective of this thesis is to understand and explain the modes of integration of accounting systems of companies from four cases (two big and two medium-sized enterprises). We relied on the theory of…

Advisors/Committee Members: Leclère, Didier (thesis director), Samara, Tarek (thesis director).

Subjects/Keywords: Théorie de la Différenciation-intégration; Approche évenementielle; Erp; Système classique bidimensionnel; Système quasi-intégré centralisé; Système intégré; Système multidimensionnel; Differenciation-Integration theory; Event approach; Erp; Conventional two-dimensional system; Quasi-integrated centralized system; Integrated system; Multidimensional system; 650

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Orf, L. E. (2012). Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study. (Doctoral Dissertation). Paris, CNAM. Retrieved from http://www.theses.fr/2012CNAM0832

Chicago Manual of Style (16^th Edition):

Orf, Lazhar El. “Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study.” 2012. Doctoral Dissertation, Paris, CNAM. Accessed March 03, 2021. http://www.theses.fr/2012CNAM0832.

MLA Handbook (7^th Edition):

Orf, Lazhar El. “Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study.” 2012. Web. 03 Mar 2021.

Vancouver:

Orf LE. Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study. [Internet] [Doctoral dissertation]. Paris, CNAM; 2012. [cited 2021 Mar 03]. Available from: http://www.theses.fr/2012CNAM0832.

Council of Science Editors:

Orf LE. Différenciation et intégration des systèmes comptables : Une étude typologique : Differentiation and integration of accounting systems : a typological study. [Doctoral Dissertation]. Paris, CNAM; 2012. Available from: http://www.theses.fr/2012CNAM0832

27. Herrmann, Lukas. Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs.

Degree: 2019, ETH Zürich

URL: http://hdl.handle.net/20.500.11850/357554

► Partial diﬀerential equations (PDEs) with incomplete knowledge on diﬀerential operators arise in science and engineering. This lack of knowledge results in uncertainty in the respective… (more)

▼ Partial diﬀerential equations (PDEs) with incomplete knowledge on diﬀerential operators arise in science and engineering. This lack of knowledge results in uncertainty in the respective solutions. Mathematically, unknown coeﬃcient functions of diﬀerential operators are modeled by random ﬁelds. These random ﬁelds describe physical quantities that constitute the PDE under consideration. In this thesis, elliptic PDEs with random coeﬃcient functions will be studied. These describe for example subsurface ﬂow in unknown media, which is modeled by a random ﬁeld. Statistical moments of random solutions are formally inﬁnite-dimensional integrals over parameter vectors that represent the random ﬁeld input. In the considered models, the logarithm of the random ﬁeld input is expanded in a function system with random, independent and identically distributed parameters. Suitable decay in the function systems allows to control the error of truncating the expansion. The resulting high-dimensional integral may be approximated by quadrature methods, particularly by quasi-Monte Carlo (QMC) rules. Here, the approximation of the expectation of functionals of the random solution is investigated. A class of admissible parameter distributions is considered, which includes the normal distribution as a special case and accommodates distributions with densities that decay more weakly than the density of the normal distribution. In this setting, QMC by randomly shifted lattice rules with so-called product weights is applicable, which allows the fast component-by-component construction algorithm to have asymptotic computational cost that grows linearly with respect to the truncation dimension, i.e., the number of terms in the expansion of the random ﬁeld input. The random solution is spatially discretized by the ﬁnite element method, which has asymptotically optimal convergence rates also in non-convex polygonal or polyhedral domains if suitable local mesh reﬁnement is used. The computational cost that is required to achieve an error threshold is studied asymptotically. In this thesis it is shown that multilevel QMC is in certain cases able to achieve an error with computational cost that is asymptotically essential the computational cost of solving the respective elliptic PDE with known, deterministic coeﬃcient function. In particular, also the computational cost of iterative methods to approximate the solution is incorporated. Advisors/Committee Members: Schwab, Christoph, Dick, Josef, Schneider, Reinhold.

Subjects/Keywords: Uncertainty Quantification; Quasi-Monte Carlo methods; High-dimensional integration; FINITE ELEMENT METHOD (NUMERICAL MATHEMATICS); Multilevel methods; Multilevel quasi-Monte Carlo; Partial differential equations with random coefficients; info:eu-repo/classification/ddc/510; Mathematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Herrmann, L. (2019). Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/357554

Chicago Manual of Style (16^th Edition):

Herrmann, Lukas. “Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs.” 2019. Doctoral Dissertation, ETH Zürich. Accessed March 03, 2021. http://hdl.handle.net/20.500.11850/357554.

MLA Handbook (7^th Edition):

Herrmann, Lukas. “Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs.” 2019. Web. 03 Mar 2021.

Vancouver:

Herrmann L. Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs. [Internet] [Doctoral dissertation]. ETH Zürich; 2019. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/20.500.11850/357554.

Council of Science Editors:

Herrmann L. Quasi-Monte Carlo Integration in Uncertainty Quantification for PDEs with log-Gaussian Random Field Inputs. [Doctoral Dissertation]. ETH Zürich; 2019. Available from: http://hdl.handle.net/20.500.11850/357554

28. XIANG DU. SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES.

Degree: 2015, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/121756

Subjects/Keywords: surface functionalization; surface transfer doping; H2 annealing; two-dimensional; quasi-one-dimensional; electronic and optoelectronic devices

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

DU, X. (2015). SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/121756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

DU, XIANG. “SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES.” 2015. Thesis, National University of Singapore. Accessed March 03, 2021. http://scholarbank.nus.edu.sg/handle/10635/121756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

DU, XIANG. “SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES.” 2015. Web. 03 Mar 2021.

Vancouver:

DU X. SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES. [Internet] [Thesis]. National University of Singapore; 2015. [cited 2021 Mar 03]. Available from: http://scholarbank.nus.edu.sg/handle/10635/121756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

DU X. SURFACE ENGINEERED ONE DIMENSIONAL AND TWO DIMENSIONAL NANOMATERIALS FOR ELECTRONIC AND OPTOELECTRONIC DEVICES. [Thesis]. National University of Singapore; 2015. Available from: http://scholarbank.nus.edu.sg/handle/10635/121756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

29. Zhang, Wei. Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases.

Degree: PhD, Physics, 2006, Georgia Tech

URL: http://hdl.handle.net/1853/14139

► This thesis presents theoretical investigations of triplet superfluidity (triplet superconductivity) in quasi-one-dimensional organic conductors and ultra-cold Fermi gases. Triplet superfluidity is different from its s-wave… (more)

Subjects/Keywords: Triplet superconductivity; Quasi-one-dimensional superconductor; Triplet superfluidity; Fermi condensate; Bose-Einstein condensation; Superfluidity; Superconductivity; One-dimensional conductors

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APA (6^th Edition):

Zhang, W. (2006). Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/14139

Chicago Manual of Style (16^th Edition):

Zhang, Wei. “Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases.” 2006. Doctoral Dissertation, Georgia Tech. Accessed March 03, 2021. http://hdl.handle.net/1853/14139.

MLA Handbook (7^th Edition):

Zhang, Wei. “Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases.” 2006. Web. 03 Mar 2021.

Vancouver:

Zhang W. Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases. [Internet] [Doctoral dissertation]. Georgia Tech; 2006. [cited 2021 Mar 03]. Available from: http://hdl.handle.net/1853/14139.

Council of Science Editors:

Zhang W. Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases. [Doctoral Dissertation]. Georgia Tech; 2006. Available from: http://hdl.handle.net/1853/14139

30. Aden Diriye, Abdourahman. Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines.

Degree: Docteur es, Génie électrique, 2018, Normandie

URL: http://www.theses.fr/2018NORMLH13

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Cette thèse s’inscrit dans une thématique de recherche prioritaire développée par le laboratoire GREAH et portant sur l’optimisation de l'efficacité énergétique des systèmes de gestion… (more)

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Cette thèse s’inscrit dans une thématique de recherche prioritaire développée par le laboratoire GREAH et portant sur l’optimisation de l'efficacité énergétique des systèmes de gestion et de production de l’énergie électrique. Dans ce cadre, les performances de convertisseurs d’énergie (machines électriques pour la conversion de l'énergie électromécanique) ont un impact déterminant sur l'efficacité énergétique de la conversion et sur la qualité de gestion de l'énergie électrique en termes de rendement, de maximisation de la puissance massique, de réduction des émissions, de réduction des coûts, ce qui nécessite, par conséquent, un effort particulier de conception et de dimensionnement. L’objectif principal de cette thèse vise à développer un modèle léger permettant d’exploiter assez rapidement l’espace des solutions potentiellement optimales dans la première phase de la conception des machines synchrones à aimants permanents. Les travaux présentés dans ce mémoire de thèse portent sur la modélisation électromagnétique pour le pré-dimensionnement et la conception des machines synchrones à aimants permanents intégrées dans l’éolien de fort puissance. Dans ce manuscrit, deux approches de modélisation des machines électriques ont été proposées. La modélisation par réseau de réluctances présentée consiste à découper le domaine d’étude en un certain nombre d’éléments volumiques dont chacun est décomposé en tubes de flux. La modélisation analytique hybride proposée est basée sur un couplage fort entre un réseau de réluctances généré à partir d’un maillage du domaine d’étude et une solution formelle des équations de Maxwell dans les régions de faible perméabilité (entrefer magnétique). Les résultats obtenus à partir de ces modèles sont validés par les résultats correspondants issus de la méthode des éléments finis. Pour montrer le gain obtenu en temps de calcul, les temps d’exécutions des codes de calcul sont comparés aux temps mis par le logiciel Flux.

This subject of the thesis is part of a priority research theme developed by the GREAH laboratory on the optimization of the energy efficiency of electrical energy management and production systems. In this context, the performance of energy converters (electrical machines for the conversion of electromechanical energy) have a decisive impact on the energy efficiency of the conversion and on the quality of electrical energy management in terms of efficiency, reduction of emissions, reduction of costs, which therefore requires a special effort to design. The main objective of this thesis is to develop a light model allowing to exploit fairly quickly the space of potentially optimal solutions in the first phase of machine design. The work presented in this thesis focuses on electromagnetic modeling for the pre-design of permanent magnets synchronous machines integrated into high power wind turbines. In this manuscript, two modeling approaches of electric machines have been proposed. The presented reluctance network modeling is generated from the mesh of studied domain as the…

Advisors/Committee Members: Amara, Yacine (thesis director), Barakat, Georges (thesis director).

Subjects/Keywords: Dimensionnement des machines synchrones; Modèle analytique hybride; Réseau de réluctances; Modélisation analytique hybride Quasi-3D; Modélisation tridimensionnelle; Machines synchrones à aimants permanents à flux axial; Equations de Maxwell; Saturation magnétique; Eoliennes; Design of synchronous machines; Hybrid analytical model; Reluctance network; Quasi-3D hybrid analytical modeling three-dimensional modeling; Axial flux permanent magnets synchronous machines; Maxwell's equations; Magnetic saturation; Wind turbine

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aden Diriye, A. (2018). Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2018NORMLH13

Chicago Manual of Style (16^th Edition):

Aden Diriye, Abdourahman. “Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines.” 2018. Doctoral Dissertation, Normandie. Accessed March 03, 2021. http://www.theses.fr/2018NORMLH13.

MLA Handbook (7^th Edition):

Aden Diriye, Abdourahman. “Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines.” 2018. Web. 03 Mar 2021.

Vancouver:

Aden Diriye A. Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines. [Internet] [Doctoral dissertation]. Normandie; 2018. [cited 2021 Mar 03]. Available from: http://www.theses.fr/2018NORMLH13.

Council of Science Editors:

Aden Diriye A. Modélisation analytique tridimensionnelle de nouvelles structures de génératrices électriques destinées à l'éolien de forte puissance : Three-dimensional analytical modeling of new electric generator structures for high power wind turbines. [Doctoral Dissertation]. Normandie; 2018. Available from: http://www.theses.fr/2018NORMLH13

Open Access Theses and Dissertations