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University of Ottawa
1.
Tun, Yarzar.
Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
.
Degree: 2017, University of Ottawa
URL: http://hdl.handle.net/10393/36886 
► Shallow flows are those whose width is significantly larger than their depth. In these types of flows, two dimensional coherent structures can be generated and…
(more)
▼ Shallow flows are those whose width is significantly larger than their depth. In these types of flows, two dimensional coherent structures can be generated and can influence the flow greatly by the lateral transfer of mass and momentum. The development of coherent structures as a result of flow instabilities has been a topic of interest for environmental fluid mechanics for decades. Studies on the use of linear modal stability analysis is commonly found in literature. However, the relatively recent development in the field of hydrodynamic stability suggests that the traditional linear modal stability analysis does not describe the behaviour of the perturbations in finite time. The discrepancy between asymptotic behaviour and finite time behaviour is particularly large in shear driven flows and it is most likely to be the case for shallow flows. This study aims to provide a better understanding of finite time growth of perturbation energy in shallow flows. The three cases of shallow flows evaluated are the mixing layer, jet and wake. The critical cases are obtained through the linear modal analysis and nonmodal analysis was conducted to show the transient behaviour in finite time for what is so-called marginally stable. Finally, the thesis concludes by generalizing the finite time energy growth in the S-k space.
Subjects/Keywords: Shallow flows;
Hydrodynamic stability;
Linear stability analysis;
Nonmodal stability analysis;
Pseudospectra
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APA (6th Edition):
Tun, Y. (2017). Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/36886
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tun, Yarzar. “Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
.” 2017. Thesis, University of Ottawa. Accessed March 02, 2021.
http://hdl.handle.net/10393/36886.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tun, Yarzar. “Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
.” 2017. Web. 02 Mar 2021.
Vancouver:
Tun Y. Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
. [Internet] [Thesis]. University of Ottawa; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10393/36886.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tun Y. Nonmodal Analysis of Temporal Transverse Shear Instabilities in Shallow Flows
. [Thesis]. University of Ottawa; 2017. Available from: http://hdl.handle.net/10393/36886
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
2.
Fischer-Gundlach, Moritz (author).
Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f3c8e60a-65d2-45e1-a838-001a5c21cceb
► Lyapunov's 2nd method can be formulated as a convex optimization problem by means of Sum-of-Squares (SOS) optimization. This gives a powerful tool for robust stability…
(more)
▼ Lyapunov's 2nd method can be formulated as a convex optimization problem by means of Sum-of-Squares (SOS) optimization. This gives a powerful tool for robust stability analysis of nonlinear systems. The use of SOS optimization is limited to small dynamical systems, because of the demanding numerical complexity underlying SOS optimization. For systems where scaling of SOS is a concern, diagonally dominant SOS (DSOS) is a possible alternative. DSOS approximates the SOS problem from within and results in a less complex optimization problem. The shortcoming of DSOS, however, is conservatism within the robust stability analysis, entailed by the approximation. In this thesis, we consider the problem of conservatism in robust stability analysis due to the application of DSOS. We propose new DSOS-based formulations which aim to reduce conservatism in robust stability analysis. Furthermore, we show how to formulate optimization problems which don't require an initial Lyapunov function candidate, and stabilize the numerical solutions of the DSOS problems. The main tool we leverage in this study is the Positivstellensatz in combination with DSOS. We demonstrate the proposed formulations on three numerical experiments. We estimate the region of attraction of the van der Pol oscillator, investigate stability of an uncertain nonlinear system and proof stability of a nonlinear system, which is documented to suffer from numerical issues when approached with SOS methods. The results show a reduction in conservatism and improvement in numerical robustness when compared to the DSOS formulation found in literature.
Biomechanical Design / Biorobotics
Advisors/Committee Members: Wolfslag, Wouter (mentor), Wisse, Martijn (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: SOS; Stability Analysis; Optimization
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APA (6th Edition):
Fischer-Gundlach, M. (. (2017). Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f3c8e60a-65d2-45e1-a838-001a5c21cceb
Chicago Manual of Style (16th Edition):
Fischer-Gundlach, Moritz (author). “Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems.” 2017. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:f3c8e60a-65d2-45e1-a838-001a5c21cceb.
MLA Handbook (7th Edition):
Fischer-Gundlach, Moritz (author). “Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems.” 2017. Web. 02 Mar 2021.
Vancouver:
Fischer-Gundlach M(. Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:f3c8e60a-65d2-45e1-a838-001a5c21cceb.
Council of Science Editors:
Fischer-Gundlach M(. Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:f3c8e60a-65d2-45e1-a838-001a5c21cceb
University of New South Wales
3.
Liu, Zhanpeng.
Stability analysis of advanced composite arches.
Degree: UNSW, 2019, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/64871
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:62832/SOURCE02?view=true
► Advanced composite arches can deliver superior mechanical performance to fulfil the criteria of themodern engineering design. Functionally graded material (FGM) and nano-reinforced materials are twoof…
(more)
▼ Advanced composite arches can deliver superior mechanical performance to fulfil the criteria of themodern engineering design. Functionally graded material (FGM) and nano-reinforced materials are twoof the most efficient advanced composite materials. Because of the material property varies continuallyin the cross-section, the structural
analysis is very challenging comparing to homogeneous materials.This dissertation aims to develop an analytical framework in the static behaviour of FG arches andnano-reinforced arches. Firstly, the linear static responses and the geometric nonlinear static responsesare analysed; the significant of the geometric nonlinear
analysis is stated by result comparison.Secondly, the static buckling
analysis is conducted; particularly, two buckling modes are discussed,which are the limit point buckling and the bifurcation buckling. Finally, the equilibrium paths areillustrated in different buckling scenarios.Energy methods are adopted to establish the equilibrium differential equations. To verify the resultsof the proposed methods, numerical models are developed by using finite element
analysis (FEA)software ANSYS. In the FE modelling, the cross-section of the arch is discretised into multiple layersto simulate the variation of the material property. From the numerical verification, the proposedanalytical solution agrees well to the numerical models. Furthermore, a renovative nano-composite arch– the Functionally Graded Porous - Graphene Platelets Reinforced (FGP-GPLRC) arch is proposed inthis research. By using the proposed analytical equations, the static responses and buckling behavioursis well analysed. From the results, the proposed FGP-GPLRC arch has an impressive strength-weightratio against buckling. Compare to homogeneous arches, the FGP-GPLRC arch has a significantreduction in the self-weight without scarifying the buckling capacity. This dissertation makes a notablecontribution to those design engineering where requires a high strength arch structure with strict sizeor weight limitation. Also, it provides a useful references and benchmarks for the researchers in thearea of advanced composite arches.
Advisors/Committee Members: Gao, Wei, Civil & Environmental Engineering, Faculty of Engineering, UNSW, guoyin, li, Mathematics & Statistics, Faculty of Science, UNSW.
Subjects/Keywords: Stability analysis; Composite arches
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APA (6th Edition):
Liu, Z. (2019). Stability analysis of advanced composite arches. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/64871 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:62832/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Liu, Zhanpeng. “Stability analysis of advanced composite arches.” 2019. Masters Thesis, University of New South Wales. Accessed March 02, 2021.
http://handle.unsw.edu.au/1959.4/64871 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:62832/SOURCE02?view=true.
MLA Handbook (7th Edition):
Liu, Zhanpeng. “Stability analysis of advanced composite arches.” 2019. Web. 02 Mar 2021.
Vancouver:
Liu Z. Stability analysis of advanced composite arches. [Internet] [Masters thesis]. University of New South Wales; 2019. [cited 2021 Mar 02].
Available from: http://handle.unsw.edu.au/1959.4/64871 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:62832/SOURCE02?view=true.
Council of Science Editors:
Liu Z. Stability analysis of advanced composite arches. [Masters Thesis]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/64871 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:62832/SOURCE02?view=true
Rutgers University
4.
Herdade, Simao, 1984-.
Stability results in additive combinatorics and graph theory.
Degree: PhD, Mathematics, 2015, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/47413/
► A general problem in Extremal Combinatorics asks about the maximum size of a collection of finite objects satisfying certain restrictions, and an ideal solution to…
(more)
▼ A general problem in Extremal Combinatorics asks about the maximum size of a collection of finite objects satisfying certain restrictions, and an ideal solution to it presents to you the objects which attain the maximum size. In several problems, it is the case that any large set satisfying the given property must be similar to one of the few extremal examples. Such stability results give us a complete understanding of the problem, and also make the result more flexible to be applied as a tool in other mathematical problems. Stability results in additive combinatorics and graph theory constitute the main topic of this thesis, in which we solve a question of Erdös and Sarközy on sums of integers, and reprove a conjecture of Posa and Seymour on powers of hamiltonian cycles. Along the way we prove stronger structural statements that have as a corollary the optimal solution to these problems. We also introduce a counting technique and two graph theory tools which we believe to be of great interest in their own right. Namely the Shifting Method, the Connecting Lemma, and a robust version of the classic Erdos-Stone Simonovits theorem.
Advisors/Committee Members: Szemerédi, Endre (chair), Komlós, János (internal member), Steiger, William (internal member), Magyar, Ákos (outside member).
Subjects/Keywords: Combinatorial analysis; Stability; Graph theory
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APA (6th Edition):
Herdade, Simao, 1. (2015). Stability results in additive combinatorics and graph theory. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/47413/
Chicago Manual of Style (16th Edition):
Herdade, Simao, 1984-. “Stability results in additive combinatorics and graph theory.” 2015. Doctoral Dissertation, Rutgers University. Accessed March 02, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/47413/.
MLA Handbook (7th Edition):
Herdade, Simao, 1984-. “Stability results in additive combinatorics and graph theory.” 2015. Web. 02 Mar 2021.
Vancouver:
Herdade, Simao 1. Stability results in additive combinatorics and graph theory. [Internet] [Doctoral dissertation]. Rutgers University; 2015. [cited 2021 Mar 02].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47413/.
Council of Science Editors:
Herdade, Simao 1. Stability results in additive combinatorics and graph theory. [Doctoral Dissertation]. Rutgers University; 2015. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47413/
5.
Peters, Andrés A.
Stability and String Stability Analysis of Formation Control Architectures for Platooning.
Degree: 2015, RIAN
URL: http://eprints.maynoothuniversity.ie/6521/
► This thesis presents theoretical results for stability and string stability of formation control architectures for platooning. We consider three important interconnection topologies for vehicles travelling…
(more)
▼ This thesis presents theoretical results for stability and string stability
of formation control architectures for platooning. We consider
three important interconnection topologies for vehicles travelling in a
straight line as a string: leader following, cyclic and bidirectional.
For the leader following topology we discuss modifications that allow
reduced coordination requirements. In the first case we consider
the use of the leader velocity as the state to be broadcast to the followers,
rather than the standard use of the leader position. This selection
yields a formation control architecture that achieves string stability
even under time delays in the state broadcast, while reducing typical
coordination requirements of leader following architectures. For the
second modification we change the way in which the leader position
is sent across the string to every follower. This technique keeps some
of the good transient properties of the standard leader following architecture
but eliminates most of the coordination requirements for
the followers. However, we show that this technique does not provide
string stability when time delays are present in the communication.
The second topology that we discuss is a cyclic one, where the first
member of the platoon is forced to track the last one. We discuss two
strategies: one where the inter-vehicle spacings may follow a constanttime
headway spacing policy and one where an independent leader
broadcasts its position to every member of a cyclic platoon. For both
strategies we obtain closed form expressions for the transfer functions
from disturbances to inter-vehicle spacings. These expressions allow
us to show that if the design parameters are not properly chosen, the
vehicle platoon may become unstable when the string size is greater
than a critical number. On the contrary, if the design parameters are
well chosen, both architectures can be made stable and string stable
for any size of the platoon.
The final topology that we consider is bidirectional, where every
member of the platoon, with the exception of the first and last, use
measurements of the two nearest neighbours to control their position
within the string. Although the derivations are more complex than
in the two previous unidirectional cases, we obtain closed form epressions for the dynamics of the platoon. These expressions are in
the form of simple transfer functions from disturbances to vehicles.
They allow us to obtain stability results for any size of the platoon
and understand the behaviour of the least stable pole location as the
string size increases.
All of the results obtained are illustrated by numerical examples
and ad-hoc simulations.
Subjects/Keywords: Stability Analysis; String Stability Analysis; Formation Control Architectures; Platooning
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APA ·
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Manager
APA (6th Edition):
Peters, A. A. (2015). Stability and String Stability Analysis of Formation Control Architectures for Platooning. (Thesis). RIAN. Retrieved from http://eprints.maynoothuniversity.ie/6521/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Peters, Andrés A. “Stability and String Stability Analysis of Formation Control Architectures for Platooning.” 2015. Thesis, RIAN. Accessed March 02, 2021.
http://eprints.maynoothuniversity.ie/6521/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Peters, Andrés A. “Stability and String Stability Analysis of Formation Control Architectures for Platooning.” 2015. Web. 02 Mar 2021.
Vancouver:
Peters AA. Stability and String Stability Analysis of Formation Control Architectures for Platooning. [Internet] [Thesis]. RIAN; 2015. [cited 2021 Mar 02].
Available from: http://eprints.maynoothuniversity.ie/6521/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Peters AA. Stability and String Stability Analysis of Formation Control Architectures for Platooning. [Thesis]. RIAN; 2015. Available from: http://eprints.maynoothuniversity.ie/6521/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
6.
Kumar, N. (author).
Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d2ed7adf-45fe-4fde-af60-14671b5319ea
► A comprehensive understanding of the stability of shear flows is a fundamental problem in fluid mechanics and it has been a subject of both theoretical…
(more)
▼ A comprehensive understanding of the stability of shear flows is a fundamental problem in fluid mechanics and it has been a subject of both theoretical and practical interest in engineering research. A key aspect of these dynamic flows is the behaviour exhibited by the instabilities as it evolves from initial small perturbations of an equilibrium state, and may lead to fluctuations. In order to control these fluctuations, a study on the spatial and temporal evolution of the perturbations must be carried out. The objective of this thesis is to perform the spatio-temporal stability analysis on the plane, incompressible shear layers representing confined and unconfined shear flows. The analysis requires the estimation of the response of the flow to the initial perturbations for fixed values of relevant parameters. The numerical tools are developed for the low order piecewise linear profile approximations to the shear layers. The influence of typical flow features, like single and multiple shear dynamics, on the stability behaviour is studied and the convective/absolute instability boundary for various parameter combinations are identified. After validation for the analytical models, the numerical tools are extended to the non-analytical models. The analysis is then performed for higher order approximations of the experimental base flows in order to validate the results from the toolkit. A variation of the flow features and variables can change the stability behaviour of the shear flows. The single shear layer dynamics cannot contribute to absolute instability in the absence of a dispersive medium, like surface tension. The surface tension acts as a stabilising mechanism for perturbations of short wavelength. The multiple shear layer dynamics dictates that the unconfined jet or wake flow is more unstable than the single shear layer with equivalent parameter values, and that very high values of surface tension stabilises all perturbations. For confined jet or wake flows, the varicose mode perturbations are found to be highly absolutely unstable in the strongly confined dense inner flow limit. The temporal branches obtained from the toolkit match with the Linear Stability Theory (LST) results. This is a key result that allows the extension of the numerical tools developed for the low order analytical models to be applied to the non-analytical models obtained for higher order approximations of the experimental base flow.
Mechanical, Maritime and Materials Engineering
Process and Energy
Advisors/Committee Members: Pinna, F. (mentor), Groot, K.J. (mentor), Pecnik, R. (mentor).
Subjects/Keywords: instability; shear flow; dispersion relation; , local stability analysis; local stability analysis
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APA ·
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MLA ·
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APA (6th Edition):
Kumar, N. (. (2016). Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d2ed7adf-45fe-4fde-af60-14671b5319ea
Chicago Manual of Style (16th Edition):
Kumar, N (author). “Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches.” 2016. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:d2ed7adf-45fe-4fde-af60-14671b5319ea.
MLA Handbook (7th Edition):
Kumar, N (author). “Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches.” 2016. Web. 02 Mar 2021.
Vancouver:
Kumar N(. Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:d2ed7adf-45fe-4fde-af60-14671b5319ea.
Council of Science Editors:
Kumar N(. Spatio-Temporal Stability Analysis of Shear Flows: Using analytical and non-analytical approaches. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:d2ed7adf-45fe-4fde-af60-14671b5319ea
7.
Peters, Andrés A.
Stability and String Stability Analysis of Formation Control Architectures for Platooning.
Degree: 2015, RIAN
URL: http://mural.maynoothuniversity.ie/6521/
► This thesis presents theoretical results for stability and string stability of formation control architectures for platooning. We consider three important interconnection topologies for vehicles travelling…
(more)
▼ This thesis presents theoretical results for stability and string stability
of formation control architectures for platooning. We consider
three important interconnection topologies for vehicles travelling in a
straight line as a string: leader following, cyclic and bidirectional.
For the leader following topology we discuss modifications that allow
reduced coordination requirements. In the first case we consider
the use of the leader velocity as the state to be broadcast to the followers,
rather than the standard use of the leader position. This selection
yields a formation control architecture that achieves string stability
even under time delays in the state broadcast, while reducing typical
coordination requirements of leader following architectures. For the
second modification we change the way in which the leader position
is sent across the string to every follower. This technique keeps some
of the good transient properties of the standard leader following architecture
but eliminates most of the coordination requirements for
the followers. However, we show that this technique does not provide
string stability when time delays are present in the communication.
The second topology that we discuss is a cyclic one, where the first
member of the platoon is forced to track the last one. We discuss two
strategies: one where the inter-vehicle spacings may follow a constanttime
headway spacing policy and one where an independent leader
broadcasts its position to every member of a cyclic platoon. For both
strategies we obtain closed form expressions for the transfer functions
from disturbances to inter-vehicle spacings. These expressions allow
us to show that if the design parameters are not properly chosen, the
vehicle platoon may become unstable when the string size is greater
than a critical number. On the contrary, if the design parameters are
well chosen, both architectures can be made stable and string stable
for any size of the platoon.
The final topology that we consider is bidirectional, where every
member of the platoon, with the exception of the first and last, use
measurements of the two nearest neighbours to control their position
within the string. Although the derivations are more complex than
in the two previous unidirectional cases, we obtain closed form epressions for the dynamics of the platoon. These expressions are in
the form of simple transfer functions from disturbances to vehicles.
They allow us to obtain stability results for any size of the platoon
and understand the behaviour of the least stable pole location as the
string size increases.
All of the results obtained are illustrated by numerical examples
and ad-hoc simulations.
Subjects/Keywords: Stability Analysis; String Stability Analysis; Formation Control Architectures; Platooning
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Peters, A. A. (2015). Stability and String Stability Analysis of Formation Control Architectures for Platooning. (Thesis). RIAN. Retrieved from http://mural.maynoothuniversity.ie/6521/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Peters, Andrés A. “Stability and String Stability Analysis of Formation Control Architectures for Platooning.” 2015. Thesis, RIAN. Accessed March 02, 2021.
http://mural.maynoothuniversity.ie/6521/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Peters, Andrés A. “Stability and String Stability Analysis of Formation Control Architectures for Platooning.” 2015. Web. 02 Mar 2021.
Vancouver:
Peters AA. Stability and String Stability Analysis of Formation Control Architectures for Platooning. [Internet] [Thesis]. RIAN; 2015. [cited 2021 Mar 02].
Available from: http://mural.maynoothuniversity.ie/6521/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Peters AA. Stability and String Stability Analysis of Formation Control Architectures for Platooning. [Thesis]. RIAN; 2015. Available from: http://mural.maynoothuniversity.ie/6521/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
8.
Krishnan, Anaga.
Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/89905
► Distribution systems carry electricity from the transmission system and deliver it to the customers. Distribution systems mainly operate using two topologies for their feeders: Radial…
(more)
▼ Distribution systems carry electricity from the transmission system and deliver it to the customers. Distribution systems mainly operate using two topologies for their feeders: Radial and Meshed. The majority of customers are served using radial distribution systems, as in the radial feeders power flows in one direction (i.e. from substation to the end-user). They are simple in design and operation and are constructed at a moderate cost. However, if there is a fault along the main feeder, there will be an interruption of power to the end-use customer. On the other hand, meshed distribution systems involve multiple paths of power flow between all the points in the network. If a fault occurs along the feeder, the power flow is rerouted to the other available paths. Thus, Heavily Due to their complex topology, meshed systems are expensive to construct and deploy. The power flow
analysis of these systems poses many challenges. Because of these reasons, their use is mainly restricted to urban areas with high load density which require very high reliability. The future grid is becoming increasingly complex and evolving to a meshed distribution topology has its own advantages. However, as presently the use of meshed systems is sparse, the work done on evaluating the
stability of these systems is minimal. As a result of which, this thesis focuses on determining the optimal power flow solvers for these complex systems, analyzing their
stability under abnormal operating conditions, and suggesting methods to reinforce the vulnerabilities in the system.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Reelopez, Jaime (committee member).
Subjects/Keywords: Power Distribution System; Meshed Distribution System; Voltage Stability Analysis; Stability Margin.
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APA (6th Edition):
Krishnan, A. (2019). Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89905
Chicago Manual of Style (16th Edition):
Krishnan, Anaga. “Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.” 2019. Masters Thesis, Virginia Tech. Accessed March 02, 2021.
http://hdl.handle.net/10919/89905.
MLA Handbook (7th Edition):
Krishnan, Anaga. “Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.” 2019. Web. 02 Mar 2021.
Vancouver:
Krishnan A. Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10919/89905.
Council of Science Editors:
Krishnan A. Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/89905
University of New South Wales
9.
Huang, Zhejun.
Mathematical analysis of combustion waves in competitive exothermic reactions.
Degree: Physical, Environmental & Mathematical Sciences, 2017, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/59003
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48232/SOURCE02?view=true
► In this thesis, we investigate the properties and linear stability of homogeneous premixed planar propagating combustion waves in one spatial dimension. In particular, we investigate…
(more)
▼ In this thesis, we investigate the properties and linear
stability of homogeneous premixed planar propagating combustion waves in one spatial dimension. In particular, we investigate travelling premixed combustion waves in a diffusional-thermal model with a two-step competitive exothermic reaction mechanism in which both reactions are exothermic and the same reactive material provides the feed for both exothermic reactive steps. Such reactions have direct relevance to the combustion of MeCH₂, where Me is either titanium or zirconium. Combustion waves in two-step competitive exothermic-reaction schemes are investigated for various fuel types, includinggaseous, porous and solid fuels, under both adiabatic and nonadiabatic conditions. In addition, the Evans Function Method is employed to analyze the linear
stability of the combustion waves. The purpose of the study is to investigate how the properties of the combustion waves vary as various parameter values change. Of particular interest are those parameters describing the ratios of the activation energies, pre-exponential factors and enthalpies of the two reactions, the Lewis number of the reactants, the heat-loss parameter and ambient temperature. As well as the transitions from stable to unstable planar wave solutions, various bifurcations are analyzed.The properties and linear
stability of the travelling-wave solutions from two-step competitive exothermic reactions are more complicated that those from single-step exothermic reaction; in particular, regions of bi-
stability exist: different solutions coexist for the same parameter values. When bi-
stability does not exist, the behaviour of the combustion waves is similar to that from the single-step reaction. When bistability does exist, two stable branches, a fast branch with fast flame speeds and a slow branch with slow flame speeds, can co-exist. The transitions between the fast and slow branches are observed by altering the fuel temperature profiles. The steady travelling waves become unstable due to the existence of Hopf bifurcations and there are three possible scenarios. The conditions of the existence of bi-
stability are discussed.
Advisors/Committee Members: Sidhu, Harvinder, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW, Jovanoski, Zlatko, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW, Towers, Isaac, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW.
Subjects/Keywords: Bi-stability; Combustion waves; Competitive exothermic reactions; Linear stability analysis
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APA (6th Edition):
Huang, Z. (2017). Mathematical analysis of combustion waves in competitive exothermic reactions. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/59003 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48232/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Huang, Zhejun. “Mathematical analysis of combustion waves in competitive exothermic reactions.” 2017. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021.
http://handle.unsw.edu.au/1959.4/59003 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48232/SOURCE02?view=true.
MLA Handbook (7th Edition):
Huang, Zhejun. “Mathematical analysis of combustion waves in competitive exothermic reactions.” 2017. Web. 02 Mar 2021.
Vancouver:
Huang Z. Mathematical analysis of combustion waves in competitive exothermic reactions. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Mar 02].
Available from: http://handle.unsw.edu.au/1959.4/59003 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48232/SOURCE02?view=true.
Council of Science Editors:
Huang Z. Mathematical analysis of combustion waves in competitive exothermic reactions. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/59003 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48232/SOURCE02?view=true
San Jose State University
10.
Flood, Charles Allen.
Unified Software Engineering Reuse: A Methodology for Effective Software Reuse.
Degree: MS, Computer Engineering, 2017, San Jose State University
URL: https://doi.org/10.31979/etd.dc8u-x65e
;
https://scholarworks.sjsu.edu/etd_theses/4796
► Software is a necessity in the modern world, and that need is continuously growing. As expensive as the creation of all this new software…
(more)
▼ Software is a necessity in the modern world, and that need is continuously growing. As expensive as the creation of all this new software is, the maintenance costs are even greater. One solution to this problem is software reuse, whereby already written software can be applied to new problems after some modification, thus reducing the overall input of new code. The goal in traditional software reuse is to produce a piece of software with enough flexibility to be used at least twice. Unfortunately, there are many difficulties in achieving software reuse using modern programming techniques. Even software built specifically for reuse is severely restricted in its utility for new applications. It is easy for new programs to require entirely new logic or new objects. Because of this, they become quickly outdated, and any labor spent creating reusable software is nullified. The solution is a method to vastly increase the reusability of software by concentrating on the base knowledge and overall goals of software rather than the details on a case-by-case basis. Finding patterns in the problem and solution spaces allows unification into a smaller solution set. Instead of each problem receiving its own solution from marginally reusable components, multiple problems are resolved with the same architecture and object set. As an added benefit, this solution will not only vastly improve software reuse, but it will make feasible systems that can construct software architecture on demand and provide the first steps to fully automated software development.
Subjects/Keywords: analysis; design; pattern; reuse; software; stability
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APA (6th Edition):
Flood, C. A. (2017). Unified Software Engineering Reuse: A Methodology for Effective Software Reuse. (Masters Thesis). San Jose State University. Retrieved from https://doi.org/10.31979/etd.dc8u-x65e ; https://scholarworks.sjsu.edu/etd_theses/4796
Chicago Manual of Style (16th Edition):
Flood, Charles Allen. “Unified Software Engineering Reuse: A Methodology for Effective Software Reuse.” 2017. Masters Thesis, San Jose State University. Accessed March 02, 2021.
https://doi.org/10.31979/etd.dc8u-x65e ; https://scholarworks.sjsu.edu/etd_theses/4796.
MLA Handbook (7th Edition):
Flood, Charles Allen. “Unified Software Engineering Reuse: A Methodology for Effective Software Reuse.” 2017. Web. 02 Mar 2021.
Vancouver:
Flood CA. Unified Software Engineering Reuse: A Methodology for Effective Software Reuse. [Internet] [Masters thesis]. San Jose State University; 2017. [cited 2021 Mar 02].
Available from: https://doi.org/10.31979/etd.dc8u-x65e ; https://scholarworks.sjsu.edu/etd_theses/4796.
Council of Science Editors:
Flood CA. Unified Software Engineering Reuse: A Methodology for Effective Software Reuse. [Masters Thesis]. San Jose State University; 2017. Available from: https://doi.org/10.31979/etd.dc8u-x65e ; https://scholarworks.sjsu.edu/etd_theses/4796
11.
Satheesh A.
Voltage stability analysis of facts controlled power
system using certain intelligent techniques;.
Degree: Voltage stability analysis of facts controlled power
system, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/17396
► Stability is the main aspect of all kinds of power system networks. newlineThere are different categories of stability in any power system: steady state newlinestability,…
(more)
▼ Stability is the main aspect of all kinds of power
system networks. newlineThere are different categories of stability
in any power system: steady state newlinestability, transient
stability, dynamic stability, voltage stability and frequency
newlinestability. In general each factor is taken into
consideration depending upon the newlineenvironment and situation.
In this research work, voltage stability is newlineconsidered to
recommend the utilities of Flexible Alternating Current
newlineTransmission System (FACTS) devices to achieve voltage
stability under newlinedisturbed conditions for a given power
system network. There are various newlineFACTS devices such as
Static Var Compensator (SVC), Static Synchronous newlineCompensator
(STATCOM), Thyristor Controlled Series Capacitor (TCSC),
newlineThyristor Controlled Phase Shifter (TCPS), Static
Synchronous Series newlineCompensator (SSSC) and Unified Power Flow
Controller (UPFC). With the newlinehelp of UPFC device, the voltage
stability investigation is dealt with and to newlinelocate the
device and minimize the loss, a certain intelligent approach is
used. newlineThey are; Artificial Neural Network (ANN) with Genetic
Algorithm (GA), newlineArtificial Neural Network (ANN) with
Particle Swarm Optimization (PSO) newlineand Artificial Neural
Network (ANN) with Bees Algorithm (BA). The load flow analysis is
carried out with Newton-Raphson method. newlineThe parameters of
UPFC are modelled into power flow equation and thus it is used to
determine the power injection in terms of voltage and power angle.
newlineThe ANN is used for identifying the optimal location for
fixing UPFC. The newlineGA, PSO and BA compute the amount of
voltage and angle to be injected. newlineThe proposed hybrid
methods are simulated using MATLAB. These newlineprocedures are
individually applied for the chosen power system network of
newlineeither 14 (or) 30 (or) 57 (or) 118 bus. The simulated
results are analysed and newlinepresented.
Advisors/Committee Members: Manigandan T.
Subjects/Keywords: Electrical engineering; Power system; Voltage stability analysis
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APA (6th Edition):
A, S. (2014). Voltage stability analysis of facts controlled power
system using certain intelligent techniques;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/17396
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
A, Satheesh. “Voltage stability analysis of facts controlled power
system using certain intelligent techniques;.” 2014. Thesis, Anna University. Accessed March 02, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/17396.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
A, Satheesh. “Voltage stability analysis of facts controlled power
system using certain intelligent techniques;.” 2014. Web. 02 Mar 2021.
Vancouver:
A S. Voltage stability analysis of facts controlled power
system using certain intelligent techniques;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Mar 02].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17396.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
A S. Voltage stability analysis of facts controlled power
system using certain intelligent techniques;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17396
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Wollongong
12.
Li, Boyuan.
Modelling, dynamic stability analysis and control of an omni-directional road vehicle.
Degree: Master of Engineering - Research, Faculty of Engineering, 2012, University of Wollongong
URL: ;
https://ro.uow.edu.au/theses/3602
► In a modern society, traffic congestion is a major problem in every metropolis. To solve the problem of traffic congestion an innovative omni-directional vehicle…
(more)
▼ In a modern society, traffic congestion is a major problem in every metropolis. To solve the problem of traffic congestion an innovative omni-directional vehicle is proposed. The most important advantage of an omni-directional vehicle is that by steering all four wheels it can turn in a small radius. This means that a smaller area is required for turning or parking. Lots of researches have focused on the use of an omni-directional vehicle for in-door situations, but less research has focussed on its use as an on road vehicle.
Therefore, this research has mainly focussed on developing the comprehensive vehicle dynamics model for an omni-directional road vehicle for high velocity conditions, transferring loads and the effect of traction and braking. This research consists of the following three parts:
A model was developed for an omni-directional vehicle that mainly focussed on vehicle dynamics in the yaw plane because the side slip angle and yaw rate are the two most important outputs of a dynamics system and determine its total stability. An innovative four wheel, independent steering system was incorporated into this vehicle dynamics model and the effect of roll motion on the yaw plane was examined.
Secondly, the stability of the vehicle in the yaw plane was analysed based on the response of the side slip angle, as first suggested. Then in the actual simulation, and based on the stability criterions, vehicle stability was determined under different scenarios. The first scenario was large and small radius turning, followed by simulating a combination of turning, braking, and traction. This was followed by an analysis of the disturbance of vehicle stability, including the bank angle, the effect of a lateral wind and the coefficient of friction. Finally, the effect of roll motion such as load transfer and roll steer, and how an independent driving system would affect vehicle stability is presented.
An active steering PID controller was suggested and which, according to the results of the simulation, improved the yaw plane stability (side slip angle).
Subjects/Keywords: modelling; stability analysis; omni-directional; control
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APA ·
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APA (6th Edition):
Li, B. (2012). Modelling, dynamic stability analysis and control of an omni-directional road vehicle. (Masters Thesis). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/3602
Chicago Manual of Style (16th Edition):
Li, Boyuan. “Modelling, dynamic stability analysis and control of an omni-directional road vehicle.” 2012. Masters Thesis, University of Wollongong. Accessed March 02, 2021.
; https://ro.uow.edu.au/theses/3602.
MLA Handbook (7th Edition):
Li, Boyuan. “Modelling, dynamic stability analysis and control of an omni-directional road vehicle.” 2012. Web. 02 Mar 2021.
Vancouver:
Li B. Modelling, dynamic stability analysis and control of an omni-directional road vehicle. [Internet] [Masters thesis]. University of Wollongong; 2012. [cited 2021 Mar 02].
Available from: ; https://ro.uow.edu.au/theses/3602.
Council of Science Editors:
Li B. Modelling, dynamic stability analysis and control of an omni-directional road vehicle. [Masters Thesis]. University of Wollongong; 2012. Available from: ; https://ro.uow.edu.au/theses/3602
University of KwaZulu-Natal
13.
Chibanda, Mwila.
Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines.
Degree: 2017, University of KwaZulu-Natal
URL: https://researchspace.ukzn.ac.za/handle/10413/16862
► Zambia is among the top 20 leading global producers of soybean (Glycine max L. Merr.) but adequate production is still hampered by low productivity. The…
(more)
▼ Zambia is among the top 20 leading global producers of soybean (Glycine max L. Merr.) but adequate production is still hampered by low productivity. The yields of soybean in Zambia average below 3.0 t/ha against a yield potential of 5.0 t/ha. This is attributed in part to poor availability of well adapted and improved cultivars. Therefore, selection for high yield potential is the prime objective of the breeding programme in the medium altitude and subtropical environments in Africa. Unfortunately, spatial and seasonal variability is large in this ecological zone. Therefore, the objectives of the study were to assess the nature and magnitude of the genotype x environmental (G x E) interactions for grain yield, to identify stable genotypes; to determine the genetic gains achieved in breeding for grain yield over 12 years, and to determine the secondary traits that directly or indirectly affect yield in soybean cultivars. Thirty genotypes that were drawn from the advanced set of lines in the programme were evaluated across 16 locations in Zambia, Malawi and Zimbabwe. The experiments were laid out in a 6 x 5 alpha lattice design, with three replications at each site. The recommended cultural practices were followed at all sites in all countries. The data were subjected to
analysis of variance (ANOVA, correlation and path coefficient
analysis, cultivar superiority index, Additive main effects and multiplicative interaction (AMMI) and Genotype, Genotype and Environment (GGE) biplot analyses, in GenStat statistical software. There were significant genotypes main effects, environment main effects and their interaction effects. The G x E of cross over type was observed. The genotypes G2, G10 and G15 were ranked among most stable genotypes by all methods, while G2 was the most desirable genotype across locations, followed by G15. Biplot
analysis revealed that E6 was the most discriminative test location while the most representative one was E4. The genetic gain study showed a 21% gain in Zambia and Malawi. No significant gain was registered in Zimbabwe. An across site
analysis of all test locations resulted in a disappearance of all genetic gain earlier observed. The cross over GXE interaction negatively affected heritability of grain yield and masked the appearance of any gains. Overall, a 6.5% gain over the population mean, showed that selection was successful in increasing yield. However, there was no significant gain observed relative to the current commercial cultivars, indicating limited breeding progress. The results of PATH correlation
analysis showed that yield was positively and significantly correlated with all traits except the number of seeds per pod. However, the correlation was weak with the exception of harvest index. The harvest index, biomass and number of pods per plant had significant influence on yield. Selection for these three traits, Harvest index, biomass and number of pods per plant would be emphasised to improve yield potential in the soybean programme.
Advisors/Committee Members: Derera, John. (advisor), Sibiya, Julia. (advisor).
Subjects/Keywords: Yield.; Stability.; Genetic gain.; Soybean.; Coefficient analysis.
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APA (6th Edition):
Chibanda, M. (2017). Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines. (Thesis). University of KwaZulu-Natal. Retrieved from https://researchspace.ukzn.ac.za/handle/10413/16862
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chibanda, Mwila. “Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines.” 2017. Thesis, University of KwaZulu-Natal. Accessed March 02, 2021.
https://researchspace.ukzn.ac.za/handle/10413/16862.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chibanda, Mwila. “Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines.” 2017. Web. 02 Mar 2021.
Vancouver:
Chibanda M. Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines. [Internet] [Thesis]. University of KwaZulu-Natal; 2017. [cited 2021 Mar 02].
Available from: https://researchspace.ukzn.ac.za/handle/10413/16862.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chibanda M. Grain yield stability, genetic gain and path coefficient analyses in advanced soybean (Glycine max (L.) Merr.) lines. [Thesis]. University of KwaZulu-Natal; 2017. Available from: https://researchspace.ukzn.ac.za/handle/10413/16862
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
14.
Mitrović, Bojan M., 1982-.
Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе.
Degree: Poljoprivredni fakultet, 2015, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:9132/bdef:Content/get
► Пољопривреда - Agronomy
У раду је проучавана генетичка варијабилност важнијих агрономских особина две полусродничке популације кукуруза стандардним статистичким методама и методама мултиваријационе анализе. За проучавање…
(more)
▼ Пољопривреда - Agronomy
У раду је проучавана генетичка варијабилност
важнијих агрономских особина две полусродничке популације кукуруза
стандардним статистичким методама и методама мултиваријационе
анализе. За проучавање је одабрана популација кукуруза уске
генетичке основе НС2Б, чија су S2 потомства укрштена са сваким од
два међусобно, и у односу на популацију генетички несродна тестера
(очинске компоненте). Након укрштања добијене су две популације
полусродника са по 40 генотипова у свакој. Огледи су постављени по
моделу непотпуног блок дизајна са понављањима у оквиру сета у току
2009, 2010. и 2011. године на три локалитета; Римски Шанчеви,
Србобран и Бачки Петровац. Анализиране су све важније агрономске
особине. На основу добијених података израчунате су просечне
вредности, показатељи варијабилности, генетичке корелације. Посебна
пажња посвећена је анализи стабилности испитиваних генотипова,
односно утицају изабраног тестера на стабилност генотипова унутар
популације. За процену стабилности коришћена су два метода; метод
преко непараметријских показатеља стабилности добијених на основу
рангирања генотипова у спољашњим срединама и метод GGE биплот
анализе. Прва група потомства остварила је више просечне вредности
за већину испитиваних особина у односу на другу групу чиме је дата
предност првом тестеру (26НС) у односу на други (72НС) за даљи рад
са популацијом. Вредности показатеља варијабилности нису се
сигнификантно разликовале између потомства и биле су уобичајене за
полусроднички (HS) тип популације. Генетичке корелације између
приноса зрна и других агрономских особина углавном су биле слабе и
несигнификантне. Јаке сигнификантне позитивне корелације
установљене су између појединих агрономских особина код обе групе
потомства. Мултиваријационом методом Генотип-особина биплот анализе
установљене су корелације у великој мери сагласне са израчунатим
корелацијама преко одговарајућих варијанси и коваријанси. На основу
вредности непараметријских показатеља стабилности Si (1) и Si (2)
између прве и друге групе потомства нису установљене сигнификантне
разлике у стабилности. Обе методе за процену стабилности издвојиле
су сличне генотипове са становишта приноса и стабилности. Два
генотипа показали су се као најперспективнији за даљи наставак
селекције са било којим од два коришћена тестера што указује да се
у њима налази највећи број пожељних алела. Остали издвојени
генотипови се такође могу сматрати перспективним али у комбинацији
са њима одговарајућим тестером.
Advisors/Committee Members: Šurlan-Momirović, Gordana, 1949-.
Subjects/Keywords: maize; multivariate analysis; stability; grain
yield
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Export
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APA (6th Edition):
Mitrović, Bojan M., 1. (2015). Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:9132/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mitrović, Bojan M., 1982-. “Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе.” 2015. Thesis, Univerzitet u Beogradu. Accessed March 02, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:9132/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mitrović, Bojan M., 1982-. “Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе.” 2015. Web. 02 Mar 2021.
Vancouver:
Mitrović, Bojan M. 1. Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе. [Internet] [Thesis]. Univerzitet u Beogradu; 2015. [cited 2021 Mar 02].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9132/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mitrović, Bojan M. 1. Генетичка варијабилност и мултиваријациона анализа
важнијих агрономских особина популације кукуруза уске генетичке
основе. [Thesis]. Univerzitet u Beogradu; 2015. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9132/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
15.
Ivanjac, Filip, 1983-.
Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije.
Degree: Stomatološki fakultet, 2016, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:13327/bdef:Content/get
► Stomatologija - Maksilofacijalna hirurgija / Denistry - Maxillofacial surgery
Klinički je dokazano da stabilnost implantata igra značajnu ulogu u narednim terapijskim fazama i omogućava da…
(more)
▼ Stomatologija - Maksilofacijalna hirurgija /
Denistry - Maxillofacial surgery
Klinički je dokazano da stabilnost implantata igra
značajnu ulogu u narednim terapijskim fazama i omogućava da
predvidimo krajnji ishod rehabilitacije. Kako uspeh
implantatno-protetičkog zbrinjavanja često zavisi od biomehaničkih
faktora, podatak o stabilnosti implantata smanjuje rizik od
neuspeha. Istraţivanja stabilnosti implantata uglavnom se odnose na
oralne implantate. U maksilofacijalnoj hirurgiji za fiksiranje
kraniofacijalnih epiteza koriste se ekstraoralni implantati. Stoga
se ukazala potreba da se sprovede pilot studija u okviru koje bi se
izmerila stabilnost kraniofacijalnih implantata analizom rezonantne
frekvencije. Cilj ovog istraţivanja bila je procena stabilnosti
kraniofacijalnih implantata analizom rezonantne frekvencije u
korelaciji sa oseointegracijom u funkciji vremena, oblikom
implantata i njihovom lokalizacijom. Metodologija: Na osnovu mikro
CT metode odreĎena je gustina kosti na kadaveričnom modelu lobanje
radi utvrĎivanja optimalne lokalizacije mesta za ugradnju
kraniofacijalnih implantata. Istraţivanjem je obuhvaćeno 20
pacijenata od toga 11 sa orbitalnim, 5 sa nazalnim i 4 sa
aurikularnim (kontrolna grupa) defektima. Ukupno 50 EO implantata
je ugraĎeno. Korišćeni su implantati oblika diska - 38 (jednostruki
8, dvostruki 19 i trostruki disk 11). U kontrolnoj grupi bilo je
ugraĎenih 12 zavrtanj implantata prečnika 4.1 mm; 3.5 mm duţine.
Stabilnost je merena Ostell mentor® aparatom. Merenja su vršena tri
puta, neposredno po ugradnji implantata, nakon 3 meseca, kao i
nakon najmanje 6 meseci. Rezultati: Na osnovu analize rezonantne
frekvencije (RFA) značajno povećanje vrednosti implantatne
stabilnosti zabeleţeno je izmeĎu sva tri vremena merenja, kod svih
tipova implantata, osim kod trostrukih disk implantata izmeĎu 3. i
6. meseca, kao i kod zavrtanj implantata izmeĎu 0. i 3. meseca.
PoreĎenjem izmeĎu grupa implantati oblika zavrtnja pokazali su
statistički značajno više vrednosti stabilnosti u odnosu na disk
implantate. MeĎusobnim poreĎenjem disk implantata nije pronaĎena
statistički značajna razlika u stabilnosti izmeĎu jednostrukih,
dvostrukih i trostrukih disk implantata tokom vremena, osim u
trećem mesecu gde su trostruki disk implantati pokazali statistički
značajno više vrednosti u odnosu na jednostruke disk implantate.
Zaključak: Kod svih pacijenata implantatna stabilnost povećavala se
tokom vremena što potvrĎuje dobru oseointegraciju. Nakon 3 meseca 6
implantati su bili dovoljno stabilni za retenciju
epiteza...
Advisors/Committee Members: Konstantinović, Vitomir, 1961-.
Subjects/Keywords: craniofacial implants; implant stability; resonant
frequency analysis
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APA ·
Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Ivanjac, Filip, 1. (2016). Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:13327/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ivanjac, Filip, 1983-. “Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije.” 2016. Thesis, Univerzitet u Beogradu. Accessed March 02, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:13327/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ivanjac, Filip, 1983-. “Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije.” 2016. Web. 02 Mar 2021.
Vancouver:
Ivanjac, Filip 1. Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Mar 02].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:13327/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ivanjac, Filip 1. Merenje stabilnosti kraniofacijalnih implantata analizom
rezonantne frekvencije. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:13327/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Catholique de Louvain
16.
Romo Hernandez, Aaron.
A thermodynamic approach to modeling and stability analysis of multiphase systems.
Degree: 2019, Université Catholique de Louvain
URL: http://hdl.handle.net/2078.1/219069
► Thermodynamic systems design, analysis, and operation stand as fundamental elements in process systems engineering. In this thesis, we investigate how to characterize multiphase thermodynamic systems…
(more)
▼ Thermodynamic systems design, analysis, and operation stand as fundamental elements in process systems engineering. In this thesis, we investigate how to characterize multiphase thermodynamic systems using physics-based methodologies. Multiphase systems are frequently assumed to operate as quasistationary processes. Quasistationary systems are restricted to evolve inside an abstract space known as the equilibrium manifold. We suggest the possibility of multiphase processes to operate far from the thermodynamic equilibrium manifold. Through the scope of (classical) irreversible thermodynamics, we address the modeling and analysis aspects of multiphase systems far from equilibrium. Using compartmental modeling techniques, we represent multiphase systems as the interconnection of simpler subsystems each of which has well defined (and not necessarily homogeneous) physical properties. Conservation laws on mass, energy, and momentum define the state of multiphase processes as the solution to differential-algebraic equation systems. As the main result for this thesis, we show that multiphase processes can evolve far from thermodynamic equilibrium as long as the state of the system is contained in what we call a domain of physical feasibility. The existence of the domain of feasibility follows as a direct consequence of the second law of thermodynamics applied to the study of multiphase systems.
(FSA - Sciences de l'ingénieur) – UCL, 2019
Advisors/Committee Members: UCL - SST/ICTM/INMA - Pôle en ingénierie mathématique, UCL - Ecole Polytechnique de Louvain, Dochain, Denis, Lefèvre, Philippe, Crevecoeur, Frédéric, Hudon, Nicolas, Ydstie, Erik B., Álvarez Alonso, Antonio.
Subjects/Keywords: Thermodynamics; Process Systems; Multiphase Systems; Stability Analysis
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APA ·
Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Romo Hernandez, A. (2019). A thermodynamic approach to modeling and stability analysis of multiphase systems. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/219069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Romo Hernandez, Aaron. “A thermodynamic approach to modeling and stability analysis of multiphase systems.” 2019. Thesis, Université Catholique de Louvain. Accessed March 02, 2021.
http://hdl.handle.net/2078.1/219069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Romo Hernandez, Aaron. “A thermodynamic approach to modeling and stability analysis of multiphase systems.” 2019. Web. 02 Mar 2021.
Vancouver:
Romo Hernandez A. A thermodynamic approach to modeling and stability analysis of multiphase systems. [Internet] [Thesis]. Université Catholique de Louvain; 2019. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2078.1/219069.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Romo Hernandez A. A thermodynamic approach to modeling and stability analysis of multiphase systems. [Thesis]. Université Catholique de Louvain; 2019. Available from: http://hdl.handle.net/2078.1/219069
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
17.
Natella, M. (author).
Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:39984220-1d55-43fb-b42c-8a692a979211
► The present work thus develops a low-fidelity formulation to investigate the flight dynamic stability of a flexible wing structure. The model is verified against other…
(more)
▼ The present work thus develops a low-fidelity formulation to investigate the flight dynamic stability of a flexible wing structure. The model is verified against other studies found in the relevant literature, which show interesting trends in terms of how some of the design variables or flight conditions influence the stability of the structure.
ASCM
Aerospace Engineering
Advisors/Committee Members: De Breuker, R. (mentor), Werter, N.P.M. (mentor).
Subjects/Keywords: aeroelasticity; flight dynamics; flexible wings; stability analysis
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APA (6th Edition):
Natella, M. (. (2015). Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:39984220-1d55-43fb-b42c-8a692a979211
Chicago Manual of Style (16th Edition):
Natella, M (author). “Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures.” 2015. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:39984220-1d55-43fb-b42c-8a692a979211.
MLA Handbook (7th Edition):
Natella, M (author). “Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures.” 2015. Web. 02 Mar 2021.
Vancouver:
Natella M(. Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:39984220-1d55-43fb-b42c-8a692a979211.
Council of Science Editors:
Natella M(. Coupled Nonlinear Aeroelasticity and Flight Dynamics for Stability Analysis of Flexible Wing Structures. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:39984220-1d55-43fb-b42c-8a692a979211
University of Hawaii – Manoa
18.
Wahl, Thomas Patrick.
Principal component analysis of the balance error scoring system in concussed and halthy high school athletes.
Degree: 2016, University of Hawaii – Manoa
URL: http://hdl.handle.net/10125/101204
► M.S. University of Hawaii at Manoa 2012.
Objective: Neuropsychological and postural stability testing have become mandated facets of high school concussion management protocols. The Balance…
(more)
▼ M.S. University of Hawaii at Manoa 2012.
Objective: Neuropsychological and postural stability testing have become mandated facets of high school concussion management protocols. The Balance Error Scoring System (BESS) is the most cost-effective and quickest objective measure of postural stability. However, previous research has demonstrated individual conditions of the BESS to be unreliable,' excessive'0'11'2 and prone to inaccuracies.12"3 It may be possible to utilize fewer stances while maintaining the integrity of its measures. Our purpose was to examine the score difference, from baseline to post test, for each condition of the BESS over the course of concussion recovery through principal component analysis.
Design and Setting: Three groups of BESS data were utilized for interpretation and cross-validation. Experimental group had baseline assessment, concussion diagnosed by their athletic trainer (AT), and post-assessments on days 1, 3, 5, 7 scored by the investigator. The clinical group had baselines and days 1 and 3, administered by participants' AT. Baseline group had only baseline assessments scored by the investigator and an additional AT.
Participants: We studied 13 high school athletes in the experimental group, 22 athletes in the clinical group, and 2,811 athletes in the baseline group.
Measurements: We assessed postural stability using the Balance Error Scoring System.
Results: Double leg firm and foam surfaces failed to meaningfully contribute to assessment of postural stability deficits. Single leg and tandem firm stances were important contributors throughout concussion recovery in the experimental and baseline groups, resulting in the composition of one principal component accounting for 64-71% of the total variance.
Conclusion: Double leg firm and foam stances do not aid in the interpretation of postural stability deficits when utilizing the BESS.
Subjects/Keywords: concussion; balance assessment; postural stability; factor analysis
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wahl, T. P. (2016). Principal component analysis of the balance error scoring system in concussed and halthy high school athletes. (Thesis). University of Hawaii – Manoa. Retrieved from http://hdl.handle.net/10125/101204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wahl, Thomas Patrick. “Principal component analysis of the balance error scoring system in concussed and halthy high school athletes.” 2016. Thesis, University of Hawaii – Manoa. Accessed March 02, 2021.
http://hdl.handle.net/10125/101204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wahl, Thomas Patrick. “Principal component analysis of the balance error scoring system in concussed and halthy high school athletes.” 2016. Web. 02 Mar 2021.
Vancouver:
Wahl TP. Principal component analysis of the balance error scoring system in concussed and halthy high school athletes. [Internet] [Thesis]. University of Hawaii – Manoa; 2016. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10125/101204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wahl TP. Principal component analysis of the balance error scoring system in concussed and halthy high school athletes. [Thesis]. University of Hawaii – Manoa; 2016. Available from: http://hdl.handle.net/10125/101204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Georgia
19.
Dewan, Akul.
Predicting protein stability change upon single point mutation using multi-instance regression.
Degree: 2017, University of Georgia
URL: http://hdl.handle.net/10724/36829
► The prediction of stability change caused by a mutation in a protein structure is of vital importance for protein design and analysis. Several attempts have…
(more)
▼ The prediction of stability change caused by a mutation in a protein structure is of vital importance for protein design and analysis. Several attempts have been made to predict these energy changes by analyzing the global conformational
properties of a structure. To date, none of the research has focused solely on studying the effect of local conformational properties of a mutated residue to the final stability change. In my thesis I use multi-instance regression learning with output
aggregation to learn and predict the energy change using the information from the local environment of the mutated residue. This research shows a high degree of correlation between the expected and predicted values of energy changes and a quantum leap
from the current state-of-the-art.
Subjects/Keywords: machine learning; protein stability; conformational analysis
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APA (6th Edition):
Dewan, A. (2017). Predicting protein stability change upon single point mutation using multi-instance regression. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/36829
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dewan, Akul. “Predicting protein stability change upon single point mutation using multi-instance regression.” 2017. Thesis, University of Georgia. Accessed March 02, 2021.
http://hdl.handle.net/10724/36829.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dewan, Akul. “Predicting protein stability change upon single point mutation using multi-instance regression.” 2017. Web. 02 Mar 2021.
Vancouver:
Dewan A. Predicting protein stability change upon single point mutation using multi-instance regression. [Internet] [Thesis]. University of Georgia; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10724/36829.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dewan A. Predicting protein stability change upon single point mutation using multi-instance regression. [Thesis]. University of Georgia; 2017. Available from: http://hdl.handle.net/10724/36829
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Gangrade, Rajat Mukesh.
Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake.
Degree: MS, Civil Engineering, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/23257
► On August 15, 2007, Pisco, Peru was hit by an earthquake of Magnitude (Mw) = 8.0 which triggered multiple liquefaction induced lateral spreads. The subduction…
(more)
▼ On August 15, 2007, Pisco, Peru was hit by an earthquake of Magnitude (Mw) = 8.0 which triggered multiple liquefaction induced lateral spreads. The subduction earthquake lasted for approximately 100 seconds and showed a complex rupture. From the geotechnical perspective, the Pisco earthquake was significant for the amount of soil liquefaction observed. A massive liquefaction induced seaward displacement of a marine terrace was observed in the Canchamana complex. Later
analysis using the pre- and post-earthquake images showed that the lateral displacements were concentrated only on some regions. Despite the lateral homogeneity of the marine terrace, some cross-sections showed large displacements while others had minimal displacements. The detailed documentation of this case-history makes it an ideal case-study for the determination of the undrained strength of the liquefied soils; hence, the main objective of this research is to use the extensive data from the Canchamana Slide to estimate the shear strength of the liquefied soils. In engineering practice, the undrained strength of liquefied soil is typically estimated by correlating SPT-N values to: 1) absolute value of residual strength, or 2) residual strength ratio. Our research aims to contribute an important data point that will add to the current understanding of the residual strength of liquefied soils.
Advisors/Committee Members: Rodriguez-Marek, Adrian (committeechair), Dove, Joseph E. (committee member), Green, Russell A. (committee member).
Subjects/Keywords: Lateral Spreading; Slope Stability Analysis; Bayesian Updating
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APA (6th Edition):
Gangrade, R. M. (2013). Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/23257
Chicago Manual of Style (16th Edition):
Gangrade, Rajat Mukesh. “Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake.” 2013. Masters Thesis, Virginia Tech. Accessed March 02, 2021.
http://hdl.handle.net/10919/23257.
MLA Handbook (7th Edition):
Gangrade, Rajat Mukesh. “Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake.” 2013. Web. 02 Mar 2021.
Vancouver:
Gangrade RM. Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10919/23257.
Council of Science Editors:
Gangrade RM. Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/23257
Delft University of Technology
21.
El Ahmar, Lynn (author).
Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1221ba42-6160-476b-98d2-1cd88fd19197
► Carbonate reservoirs are of significant importance as they host a high percentage of the world’s oil and gas reserves. They are however subject to dissolution…
(more)
▼ Carbonate reservoirs are of significant importance as they host a high percentage of the world’s oil and gas reserves. They are however subject to dissolution and may be heavily karstified often resulting in large cavities which may impose major hazards in drilling and production. In many cases, difficulty remains due to poor understanding of karst geometry and how it is distributed. This research presents a geometry and stability analysis using LIDAR (Light Detection and Ranging) data on cave systems in Brazil that can serve as direct analogues to subsurface carbonate reservoirs and therefore enhance our ability to predict them. Our study area lies in the state of Bahia in Brazil and consists of five caves: Diva De Maura, Torrinha, Ioiô, Lapinha, and Paixáo. These cave systems occur in Neoproterozoic carbonates of the Salitre Formation in the Irecê basin of the São Francisco Craton. Analysis of the geometry shows existing preferential karstic developments and tunnel shape patterns mainly classified in two, horizontal ellipse and vertical ellipse. Analysis of geologic structures and orientations of cave passages show that these caves exhibit marked structural guidance with two main orientations N-S and E-W. This aligns with the regional phases of deformation corresponding to collisional events that occurred on the margin of the São Francisco Craton. Stability analysis shows that tunnels aspect ratio is a major parameter controlling the stability, whereas the dimension of a tunnel has a much less effect on stability. Tunnels with aspect ratios less than 1 show a collapse depth greater than 1000 m and are more stable than tunnels with aspect ratios greater than 1. Results show that almost all tunnels with a horizontal ellipse geometry are supported with rock that is already undergoing severe deformation at a depth of 500m. Sensitivity tests show that overburden and rock mass strength parameters namely cohesion have the largest effect on the stability results.
Petroleum Engineering and Geoscience
Advisors/Committee Members: Bertotti, Giovanni (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Carbonates; Karst; LIDAR data; Geometry analysis; Stability
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
El Ahmar, L. (. (2019). Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1221ba42-6160-476b-98d2-1cd88fd19197
Chicago Manual of Style (16th Edition):
El Ahmar, Lynn (author). “Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:1221ba42-6160-476b-98d2-1cd88fd19197.
MLA Handbook (7th Edition):
El Ahmar, Lynn (author). “Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil.” 2019. Web. 02 Mar 2021.
Vancouver:
El Ahmar L(. Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:1221ba42-6160-476b-98d2-1cd88fd19197.
Council of Science Editors:
El Ahmar L(. Characterization of Karst Geometry and Stability Analysis of Cave Tunnels in Bahia, Brazil. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:1221ba42-6160-476b-98d2-1cd88fd19197
Texas A&M University
22.
Mittal, Ankita.
Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions.
Degree: PhD, Aerospace Engineering, 2020, Texas A&M University
URL: http://hdl.handle.net/1969.1/191778
► The emergence of flow-thermodynamic interactions and dilatational velocity field renders the evolution of perturbations in high Mach number flows significantly different from those in incompressible…
(more)
▼ The emergence of flow-thermodynamic interactions and dilatational velocity field renders the evolution of perturbations in high Mach number flows significantly different from those in incompressible flows. These effects have been reasonably well investigated in the linear and fully turbulent regimes however, further research is required to understand the effect of kinetic-internal energy exchange on fundamental nonlinear process of spectral evolution. The primary motivation of this work is to investigate the evolution of perturbations in hypersonic wall bounded Poiseuille flow and establish the effect of compressibility. The work performed addresses three important aspects of computation and prediction of perturbation evolution in high-speed flows: (i) framework for internal energy dynamics, (ii) verification of computational methods based directly on gas kinetic theory and, (iii) physical mechanisms for nonlinear breakdown towards turbulence. Three studies, each addressing the above objectives, are performed which lead to valuable advances in our ability to simulate a wide range of hypersonic flows and improve our understanding of the physical phenomenon occurring in high speed flows. The findings are particularly valuable for the transition phenomenon in hypersonic boundary layers.
In the first study, critical mathematical framework to analyze and understand the nonlinear internal-kinetic energy interactions and subsequent spectral energy transfer is developed. The objective is to develop the framework and governing equations needed to analyze internal energy interactions and its spectral distribution in a manner similar to that of kinetic energy
analysis. To emulate the role of velocity in kinetic energy
analysis, a new variable (ϕ ∼ √p where p is pressure) is introduced to enable the examination of internal energy dynamics. Evolution equations for the mean and fluctuating components of ϕ are derived. These equations enable precise examination of mean–turbulent flow internal energy interactions, internal–kinetic energy exchange and spectral distribution of internal energy.
The fundamental nature of flow instability changes with Mach number due to the underlying transformation in the nature of pressure. Therefore, a second study is performed with two-fold objectives, (i) characterize the instability modes in high Mach number Poiseuille flows using linear
stability analysis (LSA) and, (ii) perform direct numerical simulations (DNS) of the instability development using a gas-kinetic method (GKM) solver for the purpose of code validation by comparison against LSA results. The LSA and DNS are performed for the case of Poiseuille flow over a range of Mach numbers from moderately supersonic to hypersonic speeds. First, LSA is employed to establish the instability characteristics over the range of Mach numbers. It is exhibited the Mach number range can be divided into different regimes based on the dominant mode type such as first, second or higher modes. Two sets of GKM-DNS are performed to corroborate the LSA…
Advisors/Committee Members: Girimaji, Sharath S (advisor), Donzis, Diego (committee member), Karpetis, Adonios (committee member), Guermond, Jean-Luc (committee member).
Subjects/Keywords: Compressible wall-bounded flows; linear stability analysis
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APA (6th Edition):
Mittal, A. (2020). Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/191778
Chicago Manual of Style (16th Edition):
Mittal, Ankita. “Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions.” 2020. Doctoral Dissertation, Texas A&M University. Accessed March 02, 2021.
http://hdl.handle.net/1969.1/191778.
MLA Handbook (7th Edition):
Mittal, Ankita. “Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions.” 2020. Web. 02 Mar 2021.
Vancouver:
Mittal A. Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions. [Internet] [Doctoral dissertation]. Texas A&M University; 2020. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1969.1/191778.
Council of Science Editors:
Mittal A. Evolution of Perturbations in High-speed Wall-bounded Flows: Flow-thermodynamic Interactions. [Doctoral Dissertation]. Texas A&M University; 2020. Available from: http://hdl.handle.net/1969.1/191778
Vilnius Gediminas Technical University
23.
Grigalius,
Nerijus.
Keturračio motociklo stovumo
tyrimas.
Degree: Master, Transport Engineering, 2010, Vilnius Gediminas Technical University
URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100609_125342-09606
;
► Baigiamajame magistro darbe nagrinėjamas keturračio motociklo stovumas. Darbe analizuojama stovumo tyrimo struktūra. Analitinėje dalyje nustatomi penkių pasirinktų keturračių motociklų stovumo parametrai – svorių centrai, išilginio…
(more)
▼ Baigiamajame magistro darbe nagrinėjamas
keturračio motociklo stovumas. Darbe analizuojama stovumo tyrimo
struktūra. Analitinėje dalyje nustatomi penkių pasirinktų
keturračių motociklų stovumo parametrai – svorių centrai, išilginio
bei šoninio virtimo kampai, atliekamas bandytų keturračių motociklų
palyginimas. Apskaičiuojami dinaminio stovumo parametrai,
nustatomos virtimo greičio, pagreičio reikšmės. Atliekamas
modeliavimas taikomąja programa. Eksperimentinė darbo dalis apima
statinio bei dinaminio stovumo bandymus. Jų metu nustatomi slydimo
bei virtimo pradžios kampai, virtimo greičiai bei pagreičiai. Darbo
pabaigoje suformuluotos išvados, pateikiami pasiūlymai. Darbą
sudaro 7 pagrindinės dalys: įvadas, literatūros analizė, bendras
keturračio motociklo stovumo įvertinimas, pagrindinių parametrų,
įvertinančių statinio stovumo sąlygas nustatymas, dinaminio stovumo
parametrų nustatymas, eksperimentinis bandymas, išvados, naudota
literatūra. Darbo apimtis 60 psl. teksto be priedų, 32
iliustracijos, 10 lentelių, 15 bibliografinių šaltinių, 9
internetinės prieigos.
Four - wheeled motorcycle stability research
has been made in my final work for magistracy. The main principles
of stability investigation and work order were analyzed. Analytical
part contains the analysis of five selected all terrain vehicles –
determining center of gravity, longitudinal and lateral slip
angles, rollover condition calculations, comparison of acquired
data. Also parameters of dynamic stability are estimated –
determined the critical speed, lateral acceleration values.
Calculations are supported by computer simulation results.
Practical part is carried out according to the chosen method of
testing. Static stability test checks the beginning of a slip and
roll angles. Dynamic stability is tested according constant radius
method – acquired results are critical speed and lateral
acceleration. Conclusion, possible problem solutions and
perspectives are represented at the end of the work. Project
consists of 7 main parts: Introduction, literary analysis, joint
assessment of the stability of four wheeled motorcycle,
determination of basic parameters analyzing static stability,
determination of basic parameters analyzing dynamic stability, the
experimental test, conclusion and used literature. Total work
amount 60 pages without supplement. 32 llustrations, 10 charts, 15
bibliographical sources, 9 web pages.
Advisors/Committee Members: Garbinčius, Giedrius (Master’s thesis supervisor), Pukalskas, Saugirdas (Master’s thesis reviewer), Pečeliūnas, Robertas (Master’s thesis reviewer), Zautra, Rytis (Master’s degree committee chair), Valiūnas, Valdas (Master’s degree committee member), Gedzevičius, Irmantas (Master’s degree committee member).
Subjects/Keywords: Keturratis
motociklas; Statinio stovumo
tyrimas; Dinaminio stovumo
tyrimas; Stability of four wheeled
motorcycle; Static stability
analysis; Dynamic stability
analysis
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APA (6th Edition):
Grigalius,
Nerijus. (2010). Keturračio motociklo stovumo
tyrimas. (Masters Thesis). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100609_125342-09606 ;
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
Grigalius,
Nerijus. “Keturračio motociklo stovumo
tyrimas.” 2010. Masters Thesis, Vilnius Gediminas Technical University. Accessed March 02, 2021.
http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100609_125342-09606 ;.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
Grigalius,
Nerijus. “Keturračio motociklo stovumo
tyrimas.” 2010. Web. 02 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
Grigalius,
Nerijus. Keturračio motociklo stovumo
tyrimas. [Internet] [Masters thesis]. Vilnius Gediminas Technical University; 2010. [cited 2021 Mar 02].
Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100609_125342-09606 ;.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
Grigalius,
Nerijus. Keturračio motociklo stovumo
tyrimas. [Masters Thesis]. Vilnius Gediminas Technical University; 2010. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100609_125342-09606 ;
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Delft University of Technology
24.
Csicsek, A. (author).
Updated rock mechanical design criteria for the Liikavaara Östra open pit.
Degree: 2016, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:4871c75f-268d-4bc2-89d0-8c80029bd1c2
► The assessment of rock mechanical data is a fundamental step in the process of evaluating the profitability of an open pit mine. The steepness of…
(more)
▼ The assessment of rock mechanical data is a fundamental step in the process of evaluating the profitability of an open pit mine. The steepness of bench, interramp and resulting overall slope angles have a direct effect on the stripping ratio, therefore on the profitability of the mining operation. With the recently challenging metal prices in mind, the maximization of slope angles is even more important nowadays, prompting detailed investigations in the topic. The primary goal of this master thesis is to provide updated rock mechanical design criteria for the Liikavaara Östra open pit in Northern Sweden, by collecting and assessing the already available information from the area, as well as evaluating the raw data of the drilling campaign undertaken in 2016. After the compilation of the rock mechanical and geological data of the site, the bench scale slope stability was assessed with probabilistic and deterministic approach. During the process, two failure criteria (Mohr-Coulomb and Barton-Bandis) and two groundwater conditions (drained and undrained) were tested. Based on the gained experience in the neighbouring Aitik mine, the drained Barton-Bandis scenario was used both in probabilistic and deterministic approach to recommend bench face angles. Based on the findings of the bench slope analysis, an increase of the bench and interramp angles (compared to the previous design study) is possible, with the presumption of improved smooth blasting techniques and minimized back break. In identified areas with excessively poor rock quality, the application of external rock support was assessed in order to maintain reasonable bench angles and avoid mining of additional waste rock. The application of external slope support practices deemed feasible in the footwall domains of the pit, where with the utilization of support methods, the possible relocation of the E10 road can be avoided. The overall slope stability was also assessed in the footwall with limit equilibrium analysis methods. The footwall of the pit was found to be stable with the new design criteria, although it is sensitive to the presence of groundwater pressures. The master thesis was conducted as part of the European Mining, Minerals and Environmental Program (EMMEP), European Mining Course (EMC) track. The EMC is a triple-degree master program at TU Delft, RWTH Aachen and Aalto University.
Civil Engineering and Geosciences
Geoscience & Engineering
EMC is a triple-degree master program at TU Delft, RWTH Aachen and Aalto University
Advisors/Committee Members: Rinne, M. (mentor), Sjöberg, J. (mentor).
Subjects/Keywords: slope stability; kinematic analysis; probabilistic analysis; deterministic analysis; deterministic analysis; Liikavaara Östra
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Csicsek, A. (. (2016). Updated rock mechanical design criteria for the Liikavaara Östra open pit. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:4871c75f-268d-4bc2-89d0-8c80029bd1c2
Chicago Manual of Style (16th Edition):
Csicsek, A (author). “Updated rock mechanical design criteria for the Liikavaara Östra open pit.” 2016. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:4871c75f-268d-4bc2-89d0-8c80029bd1c2.
MLA Handbook (7th Edition):
Csicsek, A (author). “Updated rock mechanical design criteria for the Liikavaara Östra open pit.” 2016. Web. 02 Mar 2021.
Vancouver:
Csicsek A(. Updated rock mechanical design criteria for the Liikavaara Östra open pit. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:4871c75f-268d-4bc2-89d0-8c80029bd1c2.
Council of Science Editors:
Csicsek A(. Updated rock mechanical design criteria for the Liikavaara Östra open pit. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:4871c75f-268d-4bc2-89d0-8c80029bd1c2
East Tennessee State University
25.
Pei, Ruhang.
Revised Model for Antibiotic Resistance in a Hospital.
Degree: MS, Mathematical Sciences, 2015, East Tennessee State University
URL: https://dc.etsu.edu/etd/2471
► In this thesis we modify an existing model for the spread of resistant bacteria in a hospital. The existing model does not account for…
(more)
▼ In this thesis we modify an existing model for the spread of resistant bacteria in a hospital. The existing model does not account for some of the trends seen in the data found in literature. The new model takes some of these trends into account. For the new model, we examine issues relating to identifiability, sensitivity analysis, parameter estimation, uncertainty analysis, and equilibrium stability.
Subjects/Keywords: Antibiotic resistance; Identifiability; Sensitivity Analysis; Parameter Estimation; Uncertainty Analysis; Equilibrium; Stability Analysis; Analysis; Other Mathematics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pei, R. (2015). Revised Model for Antibiotic Resistance in a Hospital. (Thesis). East Tennessee State University. Retrieved from https://dc.etsu.edu/etd/2471
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pei, Ruhang. “Revised Model for Antibiotic Resistance in a Hospital.” 2015. Thesis, East Tennessee State University. Accessed March 02, 2021.
https://dc.etsu.edu/etd/2471.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pei, Ruhang. “Revised Model for Antibiotic Resistance in a Hospital.” 2015. Web. 02 Mar 2021.
Vancouver:
Pei R. Revised Model for Antibiotic Resistance in a Hospital. [Internet] [Thesis]. East Tennessee State University; 2015. [cited 2021 Mar 02].
Available from: https://dc.etsu.edu/etd/2471.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pei R. Revised Model for Antibiotic Resistance in a Hospital. [Thesis]. East Tennessee State University; 2015. Available from: https://dc.etsu.edu/etd/2471
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
26.
Ghazizadeh Karani, Hamid Reza.
A multiscale analysis of heat transfer in porous media.
Degree: PhD, Earth and Atmospheric Sciences, 2017, Georgia Tech
URL: http://hdl.handle.net/1853/59236
► The modeling of thermal convection in porous media is a challenging task due to the inherent structural and thermophysical heterogeneities that permeate over several scales.…
(more)
▼ The modeling of thermal convection in porous media is a challenging task due to the inherent structural and thermophysical heterogeneities that permeate over several scales. In the present thesis, I address several issues relevant to buoyancy-driven thermal convection in porous media. The central question we address is how to develop a macroscopic model of heat transfer in porous media that incorporates the pore-scale physics in a consistent manner. Our approach is based on establishing a multi-scale framework built on knowledge accrued by theoretical, numerical and experimental methods.
In Chapter 2, we develop a pore-scale computational tool based on a lattice Boltzmann (LB) model. This computational tool enables us to tackle thermal convection from a pore-scale perspective and to provide benchmarks for the development of an appropriate continuum-scale models. In Chapter 3, we use our LB model and conduct high-resolution direct numerical simulation at the pore scale. The objective is to evaluate the underlying assumptions of upscaled thermal models and to assess the role of thermophysical heterogeneties on heat transfer. We benefit from the insights gained from our pore-scale results and propose a new upscaled energy model for thermal convection in Chapter 4. The proposed model is based on a fractional-order advective term, which models the influence of thermal heterogeneities in a flexible and consistent way. In Chapter 5, we used a combination of theoretical and experimental approaches to calculate a new metric, basin
stability, for quantifying the respective relative
stability of coexisting convection modes in porous media. We show that transition between convective modes predicted by the basin
stability analysis agrees well with the experiments from our IR thermography visualization setup.
Advisors/Committee Members: Huber, Christian (advisor), Dufek, Joe (committee member), Simon, Sven (committee member), Ferrier, Ken (committee member), Magin, Richard L (committee member).
Subjects/Keywords: Thermal convection; Porous media; Multi-scale analysis; Lattice-Boltzmann method; Fractional-order thermal dispersion; Linear stability analysis; Basin stability analysis.
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ghazizadeh Karani, H. R. (2017). A multiscale analysis of heat transfer in porous media. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59236
Chicago Manual of Style (16th Edition):
Ghazizadeh Karani, Hamid Reza. “A multiscale analysis of heat transfer in porous media.” 2017. Doctoral Dissertation, Georgia Tech. Accessed March 02, 2021.
http://hdl.handle.net/1853/59236.
MLA Handbook (7th Edition):
Ghazizadeh Karani, Hamid Reza. “A multiscale analysis of heat transfer in porous media.” 2017. Web. 02 Mar 2021.
Vancouver:
Ghazizadeh Karani HR. A multiscale analysis of heat transfer in porous media. [Internet] [Doctoral dissertation]. Georgia Tech; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1853/59236.
Council of Science Editors:
Ghazizadeh Karani HR. A multiscale analysis of heat transfer in porous media. [Doctoral Dissertation]. Georgia Tech; 2017. Available from: http://hdl.handle.net/1853/59236
NSYSU
27.
Chen, Bo-jyun.
Design and Development of Automatic-Foldable Mechanical for Rollators.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705115-100815
► In this study, a new folding walker is designed to improve the problems of large volume and difficult to fold in the general market, then…
(more)
▼ In this study, a new folding walker is designed to improve the problems of large volume and difficult to fold in the general market, then it can be folded easily and portable folding. So that it can improve the independence and convenience of life for the elderly or those with reduced mobility to reduce the burden and accidental falls.
In this study, two walkers are designed for indoor and outdoor respectively. A three-wheeled walker which have higher operability is need because of the small interior space. In addition, a four-wheeled walker which have higher
stability is need because of the outside jolt road. First, design 3D model and size with Pro/Engineer, then create a mathematical model to test the walker static
stability and calculate the critical angle in dump walker with Matlab to check the walker whether conforms the standard of CNS static
stability test, in the end, according to the
analysis of stress and deformation in Pro/e Mechanica can make sure whether it is defective or broken in the structure of the walker.
In this study, the new folding structure can be folded to the minimum volume in different way. A four-wheeled walker uses the front and rear combine left and right folding way to achieve the goal of storage. Finally, the new three-wheeled walker or four-wheeled walker forward tilt and side tilt
stability are higher than Trust Care walker.
Advisors/Committee Members: Jau-Wei Perng (chair), Wei-Huang Lin (chair), Yih-Tun Tseng (committee member).
Subjects/Keywords: Stress Analysis; Rollator; Stability Analysis; Foldable Structure; Aids Device
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APA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Chen, B. (2015). Design and Development of Automatic-Foldable Mechanical for Rollators. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705115-100815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Bo-jyun. “Design and Development of Automatic-Foldable Mechanical for Rollators.” 2015. Thesis, NSYSU. Accessed March 02, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705115-100815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Bo-jyun. “Design and Development of Automatic-Foldable Mechanical for Rollators.” 2015. Web. 02 Mar 2021.
Vancouver:
Chen B. Design and Development of Automatic-Foldable Mechanical for Rollators. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Mar 02].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705115-100815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen B. Design and Development of Automatic-Foldable Mechanical for Rollators. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705115-100815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ottawa
28.
Roy, Thomas.
Time-Stepping Methods in Cardiac Electrophysiology
.
Degree: 2015, University of Ottawa
URL: http://hdl.handle.net/10393/32626
► Modelling in cardiac electrophysiology results in a complex system of partial differential equations (PDE) describing the propagation of the electrical wave in the heart muscle…
(more)
▼ Modelling in cardiac electrophysiology results in a complex system of partial differential equations (PDE) describing the propagation of the
electrical wave in the heart muscle coupled with a highly nonlinear system of ordinary differential equations (ODE) describing the ionic
activity in the cardiac cells. This system forms the widely accepted bidomain model or its slightly simpler version, the monodomain model.
To a large extent, the stiffness of the whole model depends on the choice of the ionic model, which varies in terms of complexity and
realism. These simulations require accurate and, depending on the ionic model used, possibly very stable numerical methods. At this time,
solving these models numerically requires CPU time of around one day per heartbeat. Therefore, it is necessary to use the most efficient
method for these simulations.
This research focuses on the comparison and analysis of several time-stepping methods: explicit or semi-implicit, operator splitting, deferred correction and Rush-Larsen methods. The goal is to find the optimal method for the ionic model used. For our analysis, we used the monodomain model but our results apply to the bidomain model as well. We compare the methods for three ionic models of varying complexity and stiffness: the Mitchell-Schaeffer models with only 2 variables, the more realistic Beeler-Reuter model with 8 variables, and the stiff
and very complex ten Tuscher-Noble-Noble-Panfilov (TNNP) models with 17 variables. For each method, we derived absolute stability criteria of the spatially discretized monodomain model and verified that the theoretical critical time steps obtained closely match the ones in numerical experiments. Convergence tests were also conducted to verify that the numerical methods achieve an optimal order of convergence on the model variables and derived quantities (such as speed of the wave, depolarization time), and this in spite of the local non-differentiability of some of the ionic models. We looked at the efficiency of the different methods by comparing computational times for similar accuracy. Conclusions are drawn on the methods to be used to solve the monodomain model based on the model stiffness and complexity, measured respectively by the most negative eigenvalue of the model's Jacobian and the number of variables, and based on strict stability and accuracy criteria.
Subjects/Keywords: Cardiac Electrophysiology;
Heart Simulation;
Numerical Analysis;
Stability Analysis;
Semi-Implicit methods
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Roy, T. (2015). Time-Stepping Methods in Cardiac Electrophysiology
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/32626
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Roy, Thomas. “Time-Stepping Methods in Cardiac Electrophysiology
.” 2015. Thesis, University of Ottawa. Accessed March 02, 2021.
http://hdl.handle.net/10393/32626.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Roy, Thomas. “Time-Stepping Methods in Cardiac Electrophysiology
.” 2015. Web. 02 Mar 2021.
Vancouver:
Roy T. Time-Stepping Methods in Cardiac Electrophysiology
. [Internet] [Thesis]. University of Ottawa; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10393/32626.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Roy T. Time-Stepping Methods in Cardiac Electrophysiology
. [Thesis]. University of Ottawa; 2015. Available from: http://hdl.handle.net/10393/32626
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
29.
Crumpton, Mason.
Adaptive discontinuity layout optimisation for geotechnical stability analysis.
Degree: PhD, 2018, University of Newcastle
URL: http://hdl.handle.net/1959.13/1390955
► Research Doctorate - Doctor of Philosophy (PhD)
Discontinuity Layout Optimisation (DLO) is a novel geotechnical stability analysis method which is based on the upper bound…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
Discontinuity Layout Optimisation (DLO) is a novel geotechnical stability analysis method which is based on the upper bound limit theorem. In principal, the method works by identifying an optimum collapse mechanism in a mesh of many potential mechanisms which are constructed by drawing velocity discontinuities between pairs of nodes in a grid. This approach leads to a simple formulation and avoids the numerical complications associated with modelling complete load-displacement relationships. It also has a low dependence on a priori information as meshes do not explicitly employ rigid blocks or finite elements which perform best when orientated according to the stress or velocity field at failure. However, the DLO method leads to large optimisation problems which are impractical to solve without smart algorithms. Since DLO was pioneered by Smith & Gilbert in 2007 [1], it’s functionality has been extended to model a wide range of geotechnical processes and phenomena, but there have been few developments published that concern its efficiency. This thesis describes a range of new developments for enhancing the performance of the DLO method. These include modifications to the iterative optimisation procedure at its core, and a new Adaptive Discontinuity Layout Optimisation (ADLO) procedure. The ADLO procedure improves performance by using a posteriori interpolation error estimates to refine meshes so that fewer nodes are needed to attain a specific degree of solution accuracy. Ultimately, all the new developments seek to improve performance by reducing the DLO optimisation problem size, or number of iterations needed to solve it. The new developments have been incorporated in an enhanced DLO algorithm and an adaptive DLO algorithm which were implemented in a Layout Optimisation Analysis Software (LOAS) package. This software was used to analyse a series of geotechnical stability problems so that the performance of the algorithms could be studied and compared with the Finite Element Limit Analysis (FELA) method ([2],[3],[4],[5]). It was found that all but one of the new developments consistently improved the performance of the DLO method by reducing the analysis time and optimisation problem size needed to attain a specific degree of solution accuracy. When the enhanced DLO, adaptive DLO, and FELA analysis methods were compared it was found that, for the stability cases considered, the DLO based methods were competitive with FELA in terms of computational performance.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.
Subjects/Keywords: geotechnical stability analysis; limit analysis; discontinuity layout optimisation; adaptive meshing
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APA (6th Edition):
Crumpton, M. (2018). Adaptive discontinuity layout optimisation for geotechnical stability analysis. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1390955
Chicago Manual of Style (16th Edition):
Crumpton, Mason. “Adaptive discontinuity layout optimisation for geotechnical stability analysis.” 2018. Doctoral Dissertation, University of Newcastle. Accessed March 02, 2021.
http://hdl.handle.net/1959.13/1390955.
MLA Handbook (7th Edition):
Crumpton, Mason. “Adaptive discontinuity layout optimisation for geotechnical stability analysis.” 2018. Web. 02 Mar 2021.
Vancouver:
Crumpton M. Adaptive discontinuity layout optimisation for geotechnical stability analysis. [Internet] [Doctoral dissertation]. University of Newcastle; 2018. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1959.13/1390955.
Council of Science Editors:
Crumpton M. Adaptive discontinuity layout optimisation for geotechnical stability analysis. [Doctoral Dissertation]. University of Newcastle; 2018. Available from: http://hdl.handle.net/1959.13/1390955
University of Cambridge
30.
Suliman, Ridhwaan.
A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures.
Degree: PhD, 2018, University of Cambridge
URL: https://doi.org/10.17863/CAM.25164
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753331
► This work details the development and implementation of a numerical model capable of solving strongly-coupled fluid-structure interaction problems involving long thin structures, which are common…
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▼ This work details the development and implementation of a numerical model capable of solving strongly-coupled fluid-structure interaction problems involving long thin structures, which are common multi-physics problems encountered in many applications. In most fluid-structure interaction problems the deformation of the slender elastic bodies is significant and cannot be described by a purely linear analysis. We present a new formulation to model these larger displacements. By extending the standard modal decomposition technique for linear structural analysis, the governing equations and boundary conditions are updated to account for the leading-order non-linear terms and a new modal formulation with quadratic modes is derived. The quadratic modal approach is tested on standard benchmark problems of increasing complexity and compared with analytical and full non-linear numerical solutions. Two computational fluid-structure interaction approaches are then implemented in a partitioned manner: a finite volume method for discretisation of both the fluid and solid domains and the quadratic modal formulation for the structure coupled with a finite volume fluid solver. Strong-coupling is achieved by means of a fixed-point solver with dynamic relaxation. The fluid-structure interaction approaches are validated and compared on benchmark problems of increasing complexity and strength of coupling between the fluid and solid domains. Fluid-structure interaction systems may become unstable due to the interaction between the fluid-induced pressure and structural rigidity. A thorough stability analysis of finite elastic plates in uniform flow is conducted by varying the structural length and flow velocity showing that these are critical parameters. Validation of the results with those from analytical methods is done. An analysis of the dynamic interactions between multiple finite plates in various configurations is also conducted.
Subjects/Keywords: 821.009; Modal analysis; Fluid-structure interaction; Multiphysics problems; Stability analysis
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Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Suliman, R. (2018). A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.25164 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753331
Chicago Manual of Style (16th Edition):
Suliman, Ridhwaan. “A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 02, 2021.
https://doi.org/10.17863/CAM.25164 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753331.
MLA Handbook (7th Edition):
Suliman, Ridhwaan. “A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures.” 2018. Web. 02 Mar 2021.
Vancouver:
Suliman R. A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 02].
Available from: https://doi.org/10.17863/CAM.25164 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753331.
Council of Science Editors:
Suliman R. A quadratic non-linear elasticity formulation for the dynamic behaviour of fluid-loaded structures. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.25164 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.753331
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