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University of Cape Town
1.
Rama, Ritesh Rao.
Proper orthogonal decomposition with interpolation-based real-time modelling of the heart.
Degree: Image, Centre for Research in Computational and Applied Mechanics (CERECAM), 2017, University of Cape Town
URL: http://hdl.handle.net/11427/26859 
► Several studies have been carried out recently with the aim of achieving cardiac modelling of the whole heart for a full heartbeat. However, within the…
(more)
▼ Several studies have been carried out recently with the aim of achieving cardiac
modelling of the whole heart for a full heartbeat. However, within the context of the Galerkin method, those simulations require high computational demand, ranging from 16 - 200 CPUs, and long calculation time, lasting from 1 h - 50 h. To solve this problem, this research proposes to make use of a Reduced Order Method (ROM) called the Proper Orthogonal Decomposition with Interpolation method (PODI) to achieve real-time
modelling with an adequate level of solution accuracy. The idea behind this method is to first construct a database of pre-computed full-scale solutions using the Element-free Galerkin method (EFG) and then project a selected subset of these solutions to a low dimensional space. Using the Moving Least Square method (MLS), an interpolation is carried out for the problem-at-hand, before the resulting coefficients are projected back to the original high dimensional solution space. The aim of this project is to tackle real-time
modelling of a patient-specific heart for a full heartbeat in different stages, namely:
modelling (i) the diastolic filling with variations of material properties, (ii) the isovolumetric contraction (IVC), ejection and isovolumetric relation (IVR) with arbitrary time evolutions, and (iii) variations in heart anatomy. For the diastolic filling, computations are carried out on a bi-ventricle model (BV) to investigate the performance and accuracy for varying the material parameters. The PODI calculations of the LV are completed within 14 s on a normal desktop machine with a relative L₂-error norm of 6x10⁻³. These calculations are about 2050 times faster than EFG, with each displacement step generated at a calculation frequency of 1074 Hz. An error sensitivity analysis is consequently carried out to find the most sensitive parameter and optimum dataset to be selected for the PODI calculation. In the second phase of the research, a so-called "time standardisation scheme" is adopted to model a full heartbeat cycle. This is due to the simulation of the IVC, ejection, and IVR phases being carried out using a displacement-driven calculation method which does not use uniform simulation steps across datasets. Generated results are accurate, with the PODI calculations being 2200 faster than EFG. The PODI method is, in the third phase of this work, extended to deal with arbitrary heart meshes by developing a method called "Degrees of freedom standardisation" (DOFS). DOFS consists of using a template mesh over which all dataset result fields are projected. Once the result fields are standardised, they are consequently used for the PODI calculation, before the PODI solution is projected back to the mesh of the problem-at-hand. The first template mesh to be considered is a cube mesh. However, it is found to produce results with high errors and non-physical behaviour. The second template mesh used is a heart template. In this case, a preprocessing step is required where a non-rigid transformation based on the coherent…
Advisors/Committee Members: Skatulla, Sebastian (advisor), Reddy, Daya (advisor).
Subjects/Keywords: cardiac modelling; Computational Heart Modelling
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APA (6th Edition):
Rama, R. R. (2017). Proper orthogonal decomposition with interpolation-based real-time modelling of the heart. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/26859
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):
Rama, Ritesh Rao. “Proper orthogonal decomposition with interpolation-based real-time modelling of the heart.” 2017. Thesis, University of Cape Town. Accessed March 02, 2021.
http://hdl.handle.net/11427/26859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rama, Ritesh Rao. “Proper orthogonal decomposition with interpolation-based real-time modelling of the heart.” 2017. Web. 02 Mar 2021.
Vancouver:
Rama RR. Proper orthogonal decomposition with interpolation-based real-time modelling of the heart. [Internet] [Thesis]. University of Cape Town; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11427/26859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rama RR. Proper orthogonal decomposition with interpolation-based real-time modelling of the heart. [Thesis]. University of Cape Town; 2017. Available from: http://hdl.handle.net/11427/26859
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
King Abdullah University of Science and Technology
2.
Abdel-Haleem, Alyaa M.
Comparative metabolic modeling and analysis of human pathogens.
Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2019, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/656294
► Infectious diseases continue to be major health concerns worldwide. Although major advances have led to accumulation of genomic data about human pathogens, there clearly exists…
(more)
▼ Infectious diseases continue to be major health concerns worldwide. Although major advances have led to accumulation of genomic data about human pathogens, there clearly exists a gap between genome information and studies aiming at identifying potential drug targets. Here, constraint-based modeling (CBM) was deployed to integrate disparate data types with genome-scale metabolic models (GEMs) to advance our understanding of the pathogenesis of infectious agents with respect to identifying and prioritizing drug targets. Specifically, genome-scale metabolic modeling of multiple stages and species of Plasmodium, the causative agent of malaria, was used to prioritize potential drug targets that could be used to simultaneously treat (anti-malarials) and block transmission of the parasite. In addition, species-specific metabolic models were used to guide translation of findings from non-human experimental disease models to human-infecting species. Further, comparative analysis of the essentiality of metabolic genes for V. cholerae, the causative agent of cholera, growth and survival in single and co-infections with other enteric pathogens led to prioritizing conditionally independent essential genes that would be potential drug targets in both single and co-infection scenarios. Taken together, our findings highlight the utility of using genome-scale metabolic models to prioritize druggable targets that would be of broader spectrum against human pathogens.
Advisors/Committee Members: Gojobori, Takashi (advisor), Gao, Xin (committee member), Al-Babili, Salim (committee member), Bajic, Vladimir B. (committee member), Lewis, Nathan (committee member).
Subjects/Keywords: Metabolism; Modelling; Pathogens; Computational Modelling
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APA (6th Edition):
Abdel-Haleem, A. M. (2019). Comparative metabolic modeling and analysis of human pathogens. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/656294
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):
Abdel-Haleem, Alyaa M. “Comparative metabolic modeling and analysis of human pathogens.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed March 02, 2021.
http://hdl.handle.net/10754/656294.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Abdel-Haleem, Alyaa M. “Comparative metabolic modeling and analysis of human pathogens.” 2019. Web. 02 Mar 2021.
Vancouver:
Abdel-Haleem AM. Comparative metabolic modeling and analysis of human pathogens. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10754/656294.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Abdel-Haleem AM. Comparative metabolic modeling and analysis of human pathogens. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/656294
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
3.
Choi, Cecilia.
A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:110633
► While premature birth is still one of the major clinical problems worldwide, theexact physiological mechanisms underlying myometrium activity during pregnancyremain unclear. In this thesis, a…
(more)
▼ While premature birth is still one of the major
clinical problems worldwide, theexact physiological mechanisms
underlying myometrium activity during pregnancyremain unclear. In
this thesis, a novel biophysically detailed model wasconstructed
using available experimental data to simulate chemical, electrical
andmechanical activity in a late pregnant rat uterine myocycte. The
developed modelhas been used to elucidate the ionic mechanism
underlying myometrium functionality,providing better insights in
the function of the uterus during pregnancy. Themodel consisted of
15 membrane currents, intracellular calcium handling processcoupled
with a sliding actin-myosin filament mechanical model to describe
uterinebehaviour and contractile activity at the single myocyte
level. Each of theionic currents were modelled using
Hodgkin-Huxley-type equations. The simulatedcurrent traces and
current-voltage curves were validated with experimentalrecordings
and the model was further validated by the ability to produce a
burstingaction potential (AP) during an external stimulus. The
model replicated theeffects of estradiol during pregnancy,
modulating the amplitude and activationproperties of individual
Ca2+ and K+ currents, therefore altering the AP configurationto a
tonic-like plateau. The model also reproduced the actions of
drugsto inhibit certain channels to investigate their roles in
myometrium. Sensitivityanalysis was performed to examine the
model’s behaviour to changing parameters.A simple 1-D study was
conducted to investigate how electrical signals propagatealong
strand of cells. Although the model successfully replicated results
similarto recordings seen in the experiments, limitations have to
be addressed and morestudies have to be carried out to further
improve the model.
Advisors/Committee Members: Zhang, Henggui.
Subjects/Keywords: Uterus; Modelling
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Manager
APA (6th Edition):
Choi, C. (2011). A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:110633
Chicago Manual of Style (16th Edition):
Choi, Cecilia. “A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell.” 2011. Doctoral Dissertation, University of Manchester. Accessed March 02, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:110633.
MLA Handbook (7th Edition):
Choi, Cecilia. “A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell.” 2011. Web. 02 Mar 2021.
Vancouver:
Choi C. A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Mar 02].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:110633.
Council of Science Editors:
Choi C. A biophysically detailed mathematical model of a single
late pregnant rat myometrial cell. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:110633
Penn State University
4.
Palocaren, Antony J.
Biomechanical modelling of tumor classification and growth
.
Degree: 2011, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/11797
► Palpation is an important clinical diagnostic practice which is based on the fact that tumors tend to be stiffer than the surrounding normal tissue. None…
(more)
▼ Palpation is an important clinical diagnostic practice which is based on the fact that tumors tend to be stiffer than the surrounding normal tissue. None of the modern, non-invasive, imaging modalities (such as CT scan, Magnetic Resonance Imaging, or Ultrasound) used today by radiologists to find and diagnose tumors provides the critical information about the stiffness of the imaged tissues. The work presented in this thesis is based on the clinical observation of palpation and focuses on testing the following hypothesis: the Young’s modulus of tissues helps differentiating not only between normal and abnormal tissues but, most importantly, between benign (not cancerous) and malignant (cancerous) tumors. We will show some preliminary results on tumor classification and growth with the help of biomechanical modeling. First, we propose a novel mechanical model of differentiating between benign and malignant tumors based on their corresponding Young’s moduli obtained using information about tissue microstructure provided by imaging mass spectrometry. Imaging mass spectrometry is a new technology that can provide a molecular assessment of tumor progression and treatment obtained from biopsies, with the potential to identify tumor subpopulations and predict patient survival that is not evident based on the cellular phenotype determined histologically. Our second biomechanical model shows how the mechanical properties of tumors affect their growth. By replacing the first order temporal derivative in this mechano-growth model with a fractional order derivative we are able to predict for the first time when a benign tumor turns into cancer. We used the Adomian method to find analytic solutions to the non-linear classic and fractional-order ordinary differential equation corresponding to our second model.
Advisors/Committee Members: Corina Stefania Drapaca, Thesis Advisor/Co-Advisor, Corina Stefania Drapaca, Thesis Advisor/Co-Advisor.
Subjects/Keywords: tumor modelling
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Manager
APA (6th Edition):
Palocaren, A. J. (2011). Biomechanical modelling of tumor classification and growth
. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11797
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):
Palocaren, Antony J. “Biomechanical modelling of tumor classification and growth
.” 2011. Thesis, Penn State University. Accessed March 02, 2021.
https://submit-etda.libraries.psu.edu/catalog/11797.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Palocaren, Antony J. “Biomechanical modelling of tumor classification and growth
.” 2011. Web. 02 Mar 2021.
Vancouver:
Palocaren AJ. Biomechanical modelling of tumor classification and growth
. [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Mar 02].
Available from: https://submit-etda.libraries.psu.edu/catalog/11797.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Palocaren AJ. Biomechanical modelling of tumor classification and growth
. [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11797
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waikato
5.
Mallett, Ryan James.
Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
.
Degree: 2015, University of Waikato
URL: http://hdl.handle.net/10289/9681
► Land conversion from native vegetation to agriculture has been widespread in New Zealand over the past century. The resulting increases in nutrient runoff have led…
(more)
▼ Land conversion from native vegetation to agriculture has been widespread in New Zealand over the past century. The resulting increases in nutrient runoff have led to eutrophication of many lakes and have resulted in harmful algal blooms, deoxygenation of hypolimnetic waters, and reductions in biodiversity. These problems occur in many of the Rotorua lakes including Lake Okaro, which is the most degraded of the twelve lakes. The lake has been
subject to numerous restoration efforts over the past decade (2005-2014).
In this study, I linked a catchment and a lake model to address questions around the efficacy of restoration measures. The model was also used to compare the relative benefits of catchment and in-lake restoration actions on lake trophic status. The catchment model INCA (Integrated Nitrogen Catchment model) was applied to the Okaro catchment. The output from INCA was linked to a lake water quality model DYRESM-CAEDYM (DYCD). Catchment model simulations with INCA provided a satisfactory fit to measured discharge values in the two inflow streams (Pearson R=0.77-0.82). The model adequately simulated the major variations in nitrate (NO₃), total phosphorus (TP) and soluble reactive phosphorus (SRP). However, ammonium (NH4) concentrations were not represented well for both the calibration and validation phases of the assessment.
Three scenarios were simulated using the calibrated version of INCA. This model was implemented to investigate the effectiveness of the artificial wetland (established 2006) and associated riparian planting by removing it in the catchment model simulation. Another scenario included fertiliser reductions and a third was to convert all pastoral land to dairy farming. The scenario involving the removal of the wetland/riparian area resulted in increases in total and dissolved nutrients. The fertiliser reduction simulations resulted in decreased NH4 and SRP, both of which are a major input to dry-stock and dairy farms. The conversion of all existing pastoral land to dairy farming resulted in a 160% increase in NO3-N concentrations while SRP increased by 500%.
The inputs from the INCA model were fed into the DYCD inflow file and compared with the previous analysis performed by Özkundakci et al. (2011). The calibrated model based on INCA inputs represented an improvement over earlier published versions as a result of continuous simulation of catchment inputs and enhanced calibration. The Trophic Level Index (TLI) was used to represent water quality changes in the lake in response to the different catchment management scenarios. The wetland/riparian removal increased TLI, with higher total nitrogen (TN) and total phosphorus (TP) concentrations in the surface and hypolimnetic waters, in addition to increased chlorophyll a concentrations in the surface waters. Average TLI for this scenario was 5.21, slightly greater (i.e. increased trophic status) from the baseline scenario result of 5.17. The fertiliser reduction scenario showed decreases in TN (average 26.9 mg m⁻³) over the seven-year time…
Advisors/Committee Members: Hamilton, David P (advisor), Jones, Hannah Frances Emily (advisor).
Subjects/Keywords: Modelling;
Eutrophic
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APA ·
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Export
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Manager
APA (6th Edition):
Mallett, R. J. (2015). Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
. (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/9681
Chicago Manual of Style (16th Edition):
Mallett, Ryan James. “Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
.” 2015. Masters Thesis, University of Waikato. Accessed March 02, 2021.
http://hdl.handle.net/10289/9681.
MLA Handbook (7th Edition):
Mallett, Ryan James. “Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
.” 2015. Web. 02 Mar 2021.
Vancouver:
Mallett RJ. Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
. [Internet] [Masters thesis]. University of Waikato; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10289/9681.
Council of Science Editors:
Mallett RJ. Modelling the efficacy of in-lake and catchment remediation actions for restoration of a small, eutrophic lake
. [Masters Thesis]. University of Waikato; 2015. Available from: http://hdl.handle.net/10289/9681
Open Universiteit Nederland
6.
Kwisthout, Johan.
Modelling Uncertainty in 3APL
.
Degree: 2012, Open Universiteit Nederland
URL: http://hdl.handle.net/1820/4054
► In this thesis, the author investigates how the agent programming language 3APL can be enhanced to model uncertainty. Typically, agent programming languages such as 3APL…
(more)
▼ In this thesis, the author investigates how the agent programming language 3APL can be enhanced to model uncertainty. Typically, agent programming languages such as 3APL that are based on beliefs, goals and intentions use logical formulae to represent their beliefs and reason on them. These formulae are either true or false (i.e. they are believed or not), and this limits the use of such agent programming languages in practical applications. While a lot of research has been done on the topic of reasoning with uncertainty the possible use of these methods in the field of agent programming languages such as 3APL has not been given much attention. The author investigates several methods (with a focus on Bayesian networks and Dempster-Shafer theory), and show that Dempster-Shafer theory is a promising method to use in agent programming. Particulary appealing in this theory is the ability to model ignorance, as well as uncertainty. Nevertheless, the combinatorial explosion of its combination rule and the issue of inconsistency (which are addressed in the thesis) are serious disadvantages of this theory for its practical application to agent programming. The author investigates a possible mapping of Dempster-Shafer sets to belief formulae in 3APL. With restrictions on the mass functions and on the frame of discernment, Dempster-Shafer theory is a convenient way to model uncertainty in agent beliefs. Because, with certain restrictions, mass values can be computed based on the beliefs in the belief base, we do not need to keep a combined mass function of n beliefs in memory and update it with each belief update. Therefore there is no combinational explosion. The author proposes a syntax and semantics for 3APL with uncertainty, and demonstrate a prototype Prolog implementation of the calculation of the certainty of a logical formula given a certain belief base.
Subjects/Keywords: Modelling;
3APL
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APA ·
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Manager
APA (6th Edition):
Kwisthout, J. (2012). Modelling Uncertainty in 3APL
. (Masters Thesis). Open Universiteit Nederland. Retrieved from http://hdl.handle.net/1820/4054
Chicago Manual of Style (16th Edition):
Kwisthout, Johan. “Modelling Uncertainty in 3APL
.” 2012. Masters Thesis, Open Universiteit Nederland. Accessed March 02, 2021.
http://hdl.handle.net/1820/4054.
MLA Handbook (7th Edition):
Kwisthout, Johan. “Modelling Uncertainty in 3APL
.” 2012. Web. 02 Mar 2021.
Vancouver:
Kwisthout J. Modelling Uncertainty in 3APL
. [Internet] [Masters thesis]. Open Universiteit Nederland; 2012. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1820/4054.
Council of Science Editors:
Kwisthout J. Modelling Uncertainty in 3APL
. [Masters Thesis]. Open Universiteit Nederland; 2012. Available from: http://hdl.handle.net/1820/4054
Université de Neuchâtel
7.
Kurpicz-Briki, Mascha.
Multi-level energy efficiency for heterogeneous data
centers.
Degree: 2016, Université de Neuchâtel
URL: http://doc.rero.ch/record/278534
► Le secteur des TIC (Technologies de l'Information et de la Communication) est grand consommateur d'énergie (assemblage d'appareils, constructions de réseaux, opérations, refroidissement et autres). Des…
(more)
▼ Le secteur des TIC (Technologies de l'Information et
de la Communication) est grand consommateur d'énergie (assemblage
d'appareils, constructions de réseaux, opérations, refroidissement
et autres). Des études montrent que l'ensemble des activités de
l'informatique en nuage consomme plus d'énergie que des pays
entiers comme l'Allemagne ou l'Inde. De plus, des estimations
récentes montrent que le secteur de l'informatique en nuage, et
donc l'énergie consommée par les centres de données sur lesquels
elle repose, est encore en croissance. Dans cette thèse,
je développe des approches pour faciliter la consommation
énergétique responsable des centres de données hétérogènes et par
conséquent réduire la consommation d'énergie globale du secteur des
TIC. Pour faciliter la consommation énergétique responsable, il
faut savoir combien d'énergie est consommée. Ceci est influencé par
l'infrastructure, mais aussi par chaque application qui tourne dans
le centre de données. Malheureusement, on ne peut pas appliquer un
wattmètre à une application. Pour contourner cette limitation,
cette thèse propose des modèles réalistes pour estimer la
consommation énergétique à plusieurs niveaux. Cette thèse
est organisée comme une pile à 3 niveaux: (1) centre de données,
(2) virtualisation, (3) applications clientes. Au premier niveau
des centres de données nous commençons par une première phase
d'étude de l'influence de l'hétérogénéité matérielle sur la
consommation de puissance des applications. Dans une deuxième
phase, nous développons EPAVE, un modèle pour la facturation
proportionnelle à l'énergie dans les environnements virtualisés.
EPAVE est supporté par PowerIndex, un framework pour le profilage
et l'estimation d'énergie. Au deuxième niveau de la virtualisation
nous présentons BitWatts, un outil middleware pour construire des
wattmètres logiciels. Avec BitWatts, on franchit la barrière des
environnements virtualisés pour proposer une estimation de
consommation pour des applications s'exécutant au sein de machines
virtuelles. Enfin, au troisième niveau, nous modélisons les
batteries d'appareils mobiles et proposons une approche pour
prolonger leur durée de vie.
Advisors/Committee Members: Pascal (Dir.), Anita (Codir.).
Subjects/Keywords: battery modelling
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APA ·
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Manager
APA (6th Edition):
Kurpicz-Briki, M. (2016). Multi-level energy efficiency for heterogeneous data
centers. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/278534
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):
Kurpicz-Briki, Mascha. “Multi-level energy efficiency for heterogeneous data
centers.” 2016. Thesis, Université de Neuchâtel. Accessed March 02, 2021.
http://doc.rero.ch/record/278534.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kurpicz-Briki, Mascha. “Multi-level energy efficiency for heterogeneous data
centers.” 2016. Web. 02 Mar 2021.
Vancouver:
Kurpicz-Briki M. Multi-level energy efficiency for heterogeneous data
centers. [Internet] [Thesis]. Université de Neuchâtel; 2016. [cited 2021 Mar 02].
Available from: http://doc.rero.ch/record/278534.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kurpicz-Briki M. Multi-level energy efficiency for heterogeneous data
centers. [Thesis]. Université de Neuchâtel; 2016. Available from: http://doc.rero.ch/record/278534
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Debrecen
8.
Obaseki, Ehimwenma Valerie.
Modelling Analysis Of A Call Center
.
Degree: DE – TEK – Informatikai Kar, 2013, University of Debrecen
URL: http://hdl.handle.net/2437/169192
► A call center offers telephone based services. An illustration of the traffic flow has been shown. Incoming calls waiting to be serviced by c identical…
(more)
▼ A call center offers telephone based services. An illustration of the traffic flow has been shown. Incoming calls waiting to be serviced by c identical agent. All these are connected to the ACD(Automatic Call Distributor) which handles the queue,stores operational data and directs calls to the available agents. Queuing models have be shown and the visibility of it’s application to call centers were also analyzed. Emphasis were made on some queuing models. It is very important to note the importance of queuing models when it’s related to call center model because it helps with various calculation of the waiting time,service level,arival rate,staffing etc. All these mentioned are the instruments used to analyze a call center
modelling.
Advisors/Committee Members: Sztrik, Janos (advisor).
Subjects/Keywords: Modelling;
Queuing
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APA (6th Edition):
Obaseki, E. V. (2013). Modelling Analysis Of A Call Center
. (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/169192
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):
Obaseki, Ehimwenma Valerie. “Modelling Analysis Of A Call Center
.” 2013. Thesis, University of Debrecen. Accessed March 02, 2021.
http://hdl.handle.net/2437/169192.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Obaseki, Ehimwenma Valerie. “Modelling Analysis Of A Call Center
.” 2013. Web. 02 Mar 2021.
Vancouver:
Obaseki EV. Modelling Analysis Of A Call Center
. [Internet] [Thesis]. University of Debrecen; 2013. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2437/169192.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Obaseki EV. Modelling Analysis Of A Call Center
. [Thesis]. University of Debrecen; 2013. Available from: http://hdl.handle.net/2437/169192
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Uppsala University
9.
Rydberg, Lova.
RTDS modelling of battery energy storage system.
Degree: Electricity, 2011, Uppsala University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960
► This thesis describes the development of a simplified model of a battery energy storage. The battery energy storage is part of the ABB energy…
(more)
▼ This thesis describes the development of a simplified model of a battery energy storage. The battery energy storage is part of the ABB energy storage system DynaPeaQ®. The model has been built to be run in RTDS, a real time digital simulator. Batteries can be represented by equivalent electric circuits, built up of e.g voltage sources and resistances. The magnitude of the components in an equivalent circuit varies with a number of parameters, e.g. state of charge of the battery and current flow through the battery. In order to get a model of how the resistive behaviour of the batteries is influenced by various parameters, a number of simulations have been run on a Matlab/Simulink model provided by the battery manufacturer. This model is implemented as a black box with certain inputs and outputs, and simulates the battery behaviour. From the simulation results a set of equations have been derived, which approximately give the battery resistance under different operational conditions. The equations have been integrated in the RTDS model, together with a number of controls to calculate e.g. state of charge of the batteries and battery temperature. Results from the RTDS model have been compared with results from the Simulink model. The results coincide reasonably well for the conditions tested. However, further testing is needed to ensure that the RTDS model produces results similar enough to the ones from the Simulink model, over the entire operational range.
Subjects/Keywords: battery modelling
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APA (6th Edition):
Rydberg, L. (2011). RTDS modelling of battery energy storage system. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960
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):
Rydberg, Lova. “RTDS modelling of battery energy storage system.” 2011. Thesis, Uppsala University. Accessed March 02, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rydberg, Lova. “RTDS modelling of battery energy storage system.” 2011. Web. 02 Mar 2021.
Vancouver:
Rydberg L. RTDS modelling of battery energy storage system. [Internet] [Thesis]. Uppsala University; 2011. [cited 2021 Mar 02].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rydberg L. RTDS modelling of battery energy storage system. [Thesis]. Uppsala University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
10.
Dannenberg, Paul (author).
Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:9268d9fe-eab7-4ce4-bf47-612a0664cf45
► Evacuation is a tool to minimise the loss of life and economic damages in flood (threat) scenarios. There is currently little data available on mass…
(more)
▼ Evacuation is a tool to minimise the loss of life and economic damages in flood (threat) scenarios. There is currently little data available on mass evacuation in the Netherlands to calibrate existing models or to develop new insights. This thesis aims to improve the methods used in the Netherlands to estimate the effectiveness of evacuation with methods developed by the United States Army Corps of Engineers (USACE). This USACE method includes a questionnaire that can be completed with authorities which in turn estimates the time it takes for authorities to give a warning to evacuate, how fast the warning spread through the population and how fast people will react to this warning. The results of this thesis showed that this “USACE assessment method” could be a valuable source of information to the Netherlands. However, due to the different threat scenarios and command structure(s) found in the USA several adaptations are needed to this USACE assessment method to make it usable in the Netherlands. However, this thesis also showed that the effect of (most) measures takes by authorities in the Netherlands will be limited by the heavy road congestion during evacuation. Traffic jams will quickly develop and any improvements with respect to evacuation will be cancelled out. So a recommendation that follows from this report is that authorities in the Netherlands shift their focus from an area specific evacuation strategy to a national evacuation strategy so new traffic management option can be developed that can limit these traffic jams. Another conclusion of this thesis is that agent based and micro level evacuation and loss of life models (models where people are modelled separately and area specific parameters are taken into account and thus include much more detail) add little to nothing to the evacuation strategies of the Netherlands compared to the current used macro models (models where an overarching view of the evacuation is used). Again, this is due to the large traffic congestion where traffic jams will almost immediately develop. When better traffic management options are available these micro level and agent based models may provide new insights on the evacuation effectiveness of specific areas.
Management of Technology
Advisors/Committee Members: van Gelder, Pieter (mentor), Jonkman, Sebastiaan N. (mentor), Kolen, Bas (mentor), van Well, Eddy (graduation committee), Poot, Koos (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Evacuation modelling
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dannenberg, P. (. (2020). Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9268d9fe-eab7-4ce4-bf47-612a0664cf45
Chicago Manual of Style (16th Edition):
Dannenberg, Paul (author). “Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation.” 2020. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:9268d9fe-eab7-4ce4-bf47-612a0664cf45.
MLA Handbook (7th Edition):
Dannenberg, Paul (author). “Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation.” 2020. Web. 02 Mar 2021.
Vancouver:
Dannenberg P(. Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:9268d9fe-eab7-4ce4-bf47-612a0664cf45.
Council of Science Editors:
Dannenberg P(. Evacuation in flood threat scenarios: Improving methods to estimate the required time for evacuation. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:9268d9fe-eab7-4ce4-bf47-612a0664cf45
University of Waterloo
11.
Chen, Xinling.
Embroidery Modelling and Rendering.
Degree: 2011, University of Waterloo
URL: http://hdl.handle.net/10012/6056
► Embroidery is a traditional non-photorealistic art form in which threads of different colours stitched into a base material are used to create an image. This…
(more)
▼ Embroidery is a traditional non-photorealistic art form in which threads of different colours stitched into a base material are used to create an image. This thesis presents techniques for automatically producing embroidery layouts from line drawings and for rendering those layouts in real time on potentially deformable 3D objects with hardware acceleration. Layout of stitches is based on automatic extraction of contours from line drawings followed by a set of stitch-placement procedures based on traditional embroidery techniques. Rendering first captures the lighting environment on the surface of the target object and renders it as an image in texture space. Stitches are rendered in this space using a lighting model suitable for threads at a resolution that avoids geometric and highlight aliasing. It is also possible to render stitches in layers to capture the 2.5D nature of embroidery. A filtered texture pyramid is constructed from the resulting texture and applied to the 3D object. Aliasing of fine stitch structure and highlights is avoided by this process. The result is a realistic embroidered image that properly responds to lighting.
Subjects/Keywords: Rendering; Modelling
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APA ·
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APA (6th Edition):
Chen, X. (2011). Embroidery Modelling and Rendering. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6056
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, Xinling. “Embroidery Modelling and Rendering.” 2011. Thesis, University of Waterloo. Accessed March 02, 2021.
http://hdl.handle.net/10012/6056.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Xinling. “Embroidery Modelling and Rendering.” 2011. Web. 02 Mar 2021.
Vancouver:
Chen X. Embroidery Modelling and Rendering. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10012/6056.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen X. Embroidery Modelling and Rendering. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6056
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loughborough University
12.
Areshi, Mounirah.
Mathematical modelling of liquids on surfaces.
Degree: PhD, 2020, Loughborough University
URL: https://doi.org/10.26174/thesis.lboro.12812762.v1
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.812960
► This thesis investigates the wetting behaviour of liquids on solid surfaces both in and out of equilibrium using two different general approaches from statistical mechanics.…
(more)
▼ This thesis investigates the wetting behaviour of liquids on solid surfaces both in and out of equilibrium using two different general approaches from statistical mechanics. These are based on generalised lattice-gas models. Properties such as wettability and the contact angle are determined by the attraction strength parameters between the particles and with the solid surface. The wetting behaviour of liquids is characterised by the binding or interface potential, which we calculate. The two approaches used are kinetic Monte Carlo (KMC) and density functional theory (DFT). The time evolution in our KMC model involves two processes: (1) single-particle moves, which incorporates into the model particle diffusion over the surface and within the droplets, evaporation and condensation, i.e., the exchange of particles between droplets and the surrounding vapour; (2) larger-scale collective moves, which model advective hydrodynamic fluid motion, which are determined by considering the dynamics predicted by a thin-film equation. We calculate the thermodynamic quantities such as the contact angle using various methods and make a comparison between results from the different approaches. We present results for droplets joining, spreading, sliding under gravity, dewetting, the effects of evaporation, the interplay of diffusive and advective dynamics, and how all this behaviour depends on the temperature and other parameters. In addition, we consider the interfacial phase behaviour of binary liquid mixtures. We develop a DFT based method for calculating the binding potential as a function of the local adsorption of each species at the interface. This function characterises the interfacial phase behaviour of the mixture. Moreover, we show that in certain cases it can be multivalued.
Subjects/Keywords: Mathematical Modelling
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APA ·
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APA (6th Edition):
Areshi, M. (2020). Mathematical modelling of liquids on surfaces. (Doctoral Dissertation). Loughborough University. Retrieved from https://doi.org/10.26174/thesis.lboro.12812762.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.812960
Chicago Manual of Style (16th Edition):
Areshi, Mounirah. “Mathematical modelling of liquids on surfaces.” 2020. Doctoral Dissertation, Loughborough University. Accessed March 02, 2021.
https://doi.org/10.26174/thesis.lboro.12812762.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.812960.
MLA Handbook (7th Edition):
Areshi, Mounirah. “Mathematical modelling of liquids on surfaces.” 2020. Web. 02 Mar 2021.
Vancouver:
Areshi M. Mathematical modelling of liquids on surfaces. [Internet] [Doctoral dissertation]. Loughborough University; 2020. [cited 2021 Mar 02].
Available from: https://doi.org/10.26174/thesis.lboro.12812762.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.812960.
Council of Science Editors:
Areshi M. Mathematical modelling of liquids on surfaces. [Doctoral Dissertation]. Loughborough University; 2020. Available from: https://doi.org/10.26174/thesis.lboro.12812762.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.812960
University of Oxford
13.
Roper, Ian Paul Edward.
Silicon anode in lithium-ion batteries.
Degree: PhD, 2019, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:2d3b58f1-000d-4ddc-a162-431f7b936e3c
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.816614
► In this thesis we consider the chemo-mechanical response of a multi-material lithium-ion battery anode nano-particle at equilibrium. The stresses are induced by lithium being intercalated…
(more)
▼ In this thesis we consider the chemo-mechanical response of a multi-material lithium-ion battery anode nano-particle at equilibrium. The stresses are induced by lithium being intercalated into the nano-particle, causing the anode materials to expand. The presence of several anode materials expanding to different extents induces stress even at equilibrium. The model we primarily study is a linear elasticity model derived under the assumption that the stress-free expansion of each anode material is small. We couple the mechanical model to a diffusion-based model governing the transport of lithium in each material through stress-assisted diffusion. At equilibrium, the chemical potential of the lithium, which depends both on the lithium concentration and the hydrostatic stress, is uniform throughout the nano-particle, governing the distribution of lithium between the materials. Silicon is a promising anode material with a high capacity for lithium, but it expands to around 380% its original size when fully lithiated, leading to several issues during battery usage. We apply our equilibrium model to a nano-particle consisting of a silicon core and a surrounding graphite shell. The aim of using both materials is to mitigate the expansion of silicon without sacrificing too much capacity. We analyse the lithium concentration, displacement and stresses within each material, and use the results to optimise the volume of the silicon core based on several measures of success. Void spaces and porous silicon are introduced into the nano-particle design, using the method of multiple scales, to improve on the simple core–shell design, to moderate success. We extend the model to a geometrically nonlinear elastic model, and analyse this after finding that solutions cease to exist above a certain state of charge. Finally, we incorporate yielding and fracture of both materials into the linear model, based on perfect plasticity.
Subjects/Keywords: Mathematical Modelling
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APA (6th Edition):
Roper, I. P. E. (2019). Silicon anode in lithium-ion batteries. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:2d3b58f1-000d-4ddc-a162-431f7b936e3c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.816614
Chicago Manual of Style (16th Edition):
Roper, Ian Paul Edward. “Silicon anode in lithium-ion batteries.” 2019. Doctoral Dissertation, University of Oxford. Accessed March 02, 2021.
http://ora.ox.ac.uk/objects/uuid:2d3b58f1-000d-4ddc-a162-431f7b936e3c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.816614.
MLA Handbook (7th Edition):
Roper, Ian Paul Edward. “Silicon anode in lithium-ion batteries.” 2019. Web. 02 Mar 2021.
Vancouver:
Roper IPE. Silicon anode in lithium-ion batteries. [Internet] [Doctoral dissertation]. University of Oxford; 2019. [cited 2021 Mar 02].
Available from: http://ora.ox.ac.uk/objects/uuid:2d3b58f1-000d-4ddc-a162-431f7b936e3c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.816614.
Council of Science Editors:
Roper IPE. Silicon anode in lithium-ion batteries. [Doctoral Dissertation]. University of Oxford; 2019. Available from: http://ora.ox.ac.uk/objects/uuid:2d3b58f1-000d-4ddc-a162-431f7b936e3c ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.816614
14.
Hagström, Sara.
Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
.
Degree: Chalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE), 2021, Chalmers University of Technology
URL: http://hdl.handle.net/20.500.12380/302168
► A large portion of the plastics contaminating the watercourses and oceans are the so called microplastics, derived from wear and tear of tyres. There is…
(more)
▼ A large portion of the plastics contaminating the watercourses and oceans are the so called microplastics, derived from wear and tear of tyres. There is a lack of knowledge on where the microplastic particles are deposited. Therefore, the aim of this thesis is to present an estimation of the microplastic sources and sinks in a small case study stream crossing a rural highway. This is done based on a literature review of the transportation behaviour of road related microplastics and the surrounding environment factors affecting the fate and transport, and by building a compartment model of the case study stream.
To model the water pathways in connection to the case study road stretch between Jonsered and Lerum in western Sweden, the hydrological modelling tool SWAT was used, simulating the time dependent flow in the stream. With the SWAT modelled values as input data, a compartment model based on Stoke’s law in combination with Hazen’s surface loading theory was set up with the most affecting and feasible factors included. The factors included were road entrapment, wind transport, verge removal and settling of particles in the water phase. The model was built on a combination of field studies of the flow conditions and stream dimensions. Four scenarios based on real dates were simulated to show seasonal differences and to estimate the exposure of the natural environment in the area to the microplastics. To gain information about the impact of each factor, eight sensitivity analysis scenarios were set up, analysing each factor compared to a baseline scenario.
The particles were shown to deposit early in the system, and only the particles in the smallest range remained suspended in the water leaving the stream. The exposure to microplastics was simulated to be highest during the winter half-year, when the wear rate of tyres is increased and the flow in the stream is generally higher. Also, the number of antecedent dry days was shown crucial for the concentration in the outgoing road runoff and hence for the exposure of microplastics in the stream.
Knowing the fate and transport of microplastics in the environment is essential to assess the scale of the problem, and to build a base for implementation of microplastic reduction measures for a cleaner environment.
Subjects/Keywords: microplastics;
water quality modelling;
Compartment modelling;
hydrological modelling;
SWAT-modelling;
stormwater
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Hagström, S. (2021). Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
. (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/302168
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):
Hagström, Sara. “Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
.” 2021. Thesis, Chalmers University of Technology. Accessed March 02, 2021.
http://hdl.handle.net/20.500.12380/302168.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hagström, Sara. “Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
.” 2021. Web. 02 Mar 2021.
Vancouver:
Hagström S. Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
. [Internet] [Thesis]. Chalmers University of Technology; 2021. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/20.500.12380/302168.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hagström S. Fate and Transport of Microplastic Particles in Small Highway-Adjacent Streams - A case study in Gothenburg region
. [Thesis]. Chalmers University of Technology; 2021. Available from: http://hdl.handle.net/20.500.12380/302168
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
15.
Reijm, Tony (author).
BrixMS - Context Independent Modelling and Simulation.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:11c0bf24-9b58-4a3a-835e-d26b43aaaa59
► The global society is facing a number of Grand Challenges, problems that are often ill- defined and for which time is running out. Finding potential…
(more)
▼ The global society is facing a number of Grand Challenges, problems that are often ill- defined and for which time is running out. Finding potential solutions requires the use of Modelling and Simulation (M&S) tools that can facilitate large scale collaborative and multi-perspective efforts. Ideally this is done by building across contexts on each other’s insights and contributions as if they were bricks. However, current M&S software does not support context independent bricks due to a variety of rigid bindings; the bricks are essentially glued to a context and cannot easily be reused. In this research we combine the fields of M&S and Computer Science to determine under which circumstances context independent bricks can exist. We took the current concepts about components and applied a low coupling high cohesion attitude to create a new flexible structure, the Brix; we formally defined this structure in the Brix Formalism. Furthermore we built a proof-of-concept system named BrixMS in JavaScript that can simulate models built in context independent bricks. BrixMS offers little in the way of features, yet it has the potential to simulate any computable system with an unmatched flexibility and reusability. While hard limits exist in terms of how we can represent Grand Challenges and how much we can compute, BrixMS proves that context independent bricks are a practical reality that we can use to more effectively find solutions to our Grand Challenges.
Engineering and Policy Analysis
Advisors/Committee Members: Verbraeck, Alexander (graduation committee), Pruyt, Erik (mentor), Huang, Yilin (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: modelling tool; modelling formalism; grand challenges; components
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APA (6th Edition):
Reijm, T. (. (2019). BrixMS - Context Independent Modelling and Simulation. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:11c0bf24-9b58-4a3a-835e-d26b43aaaa59
Chicago Manual of Style (16th Edition):
Reijm, Tony (author). “BrixMS - Context Independent Modelling and Simulation.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:11c0bf24-9b58-4a3a-835e-d26b43aaaa59.
MLA Handbook (7th Edition):
Reijm, Tony (author). “BrixMS - Context Independent Modelling and Simulation.” 2019. Web. 02 Mar 2021.
Vancouver:
Reijm T(. BrixMS - Context Independent Modelling and Simulation. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:11c0bf24-9b58-4a3a-835e-d26b43aaaa59.
Council of Science Editors:
Reijm T(. BrixMS - Context Independent Modelling and Simulation. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:11c0bf24-9b58-4a3a-835e-d26b43aaaa59
Delft University of Technology
16.
van der Geugten, Gerald (author).
Predicting the sea surface from high resolution multi-beam FMCW radar data.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:1ba166c4-2656-4f39-a250-eec61258838c
► In this thesis a deterministic wave model is used to reconstruct and predict the sea surface motion from FMCW (Frequency Modulated Continuous Wave) radar data,…
(more)
▼ In this thesis a deterministic wave model is used to reconstruct and predict the sea surface motion from FMCW (Frequency Modulated Continuous Wave) radar data, produced by Radac. The deterministic model that is used to do this is based on the linear wave theory. The radar is looking horizontally straight towards the waves in 5 separate beam directions of -40,-20,0, 20 and 40 degrees. Using the FMCW principle the backscatterd signal is converted into velocity and spatial range information. After some compensations (current for example) this velocity data can be treated as horizontal component of the orbital velocity of the wave. By using a least-squares solving approach (the trust-region reflective algorithm) on these orbital velocities and the expression that holds for them in the linear wave theory the model can be fitted to the measurements. The result of the least squares solver consists of a set of parameters for wave amplitude, phase and frequency. With these parameters the deterministic motion of the sea surface can be computed. This method is tested using artificial data and a generalized one directional case (using information from 1 beam under assumption of infinitely long-crested waves). For the experiments with artificial data consisting of waves with Hs = 2 meters (significant waveheight) the results are promising. A prediction time of 30 seconds over a range of 150 meters with an average error of 15 cm in the one directional model (fitted on 10 second data over 384 meters) can be achieved. For the multi directional model this lies between 20 and 30 seconds with an average error of 25 cm, depending on the spreading of the waves. Experiments with real data show less impressive results, an accurate reconstruction of the surface can be given, but the predictive capability is very limited.
Applied Mathematics | Applied Physics
Advisors/Committee Members: Heemink, Arnold (mentor), van der Vlugt, Rolf (mentor), Dubbeldam, Johan (graduation committee), van Gijzen, Martin (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: FMCW radars; Sea Modelling; Inverse Modelling
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APA (6th Edition):
van der Geugten, G. (. (2020). Predicting the sea surface from high resolution multi-beam FMCW radar data. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1ba166c4-2656-4f39-a250-eec61258838c
Chicago Manual of Style (16th Edition):
van der Geugten, Gerald (author). “Predicting the sea surface from high resolution multi-beam FMCW radar data.” 2020. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:1ba166c4-2656-4f39-a250-eec61258838c.
MLA Handbook (7th Edition):
van der Geugten, Gerald (author). “Predicting the sea surface from high resolution multi-beam FMCW radar data.” 2020. Web. 02 Mar 2021.
Vancouver:
van der Geugten G(. Predicting the sea surface from high resolution multi-beam FMCW radar data. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:1ba166c4-2656-4f39-a250-eec61258838c.
Council of Science Editors:
van der Geugten G(. Predicting the sea surface from high resolution multi-beam FMCW radar data. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:1ba166c4-2656-4f39-a250-eec61258838c
University of Western Ontario
17.
Chambers, Spencer B.
The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation.
Degree: 2019, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/6707
► Scaphoid fractures are very common injuries that can have serious sequelae if pathologic healing ensues. Although there is consensus regarding the importance of a non-united…
(more)
▼ Scaphoid fractures are very common injuries that can have serious sequelae if pathologic healing ensues. Although there is consensus regarding the importance of a non-united scaphoid, the impact of a malunited scaphoid is less clear. This is based on a paucity in the literature and understanding of the natural history of scaphoid malunion. This study aims to elucidate this study but investigating the impact of scaphoid malunion and joint kinetics, as well as the impact of scaphoid malunion on carpal bone kinematics. This was accomplished using a combination of in-silico, as well as in-vivo modelling based of cadaveric results derived from an active motion. Our results showed that increasing scaphoid malunion was associated with increasing joint contact at the radioscaphoid joint. There was no significant relationship between scaphoid motion and scaphoid malunion severity, however, there was a significant change in lunate motion, as well as motion between the scaphoid and lunate.
This work serves as the framework for understanding the complex motion of the carpus and emphasizes the potential importance of establishing a good reduction of the scaphoid following fracture. The clinical importance of this finding has yet to be elucidated, but by understanding this relationship future clinical studies can be target at identifying feature of patients who may benefit from therapy.
Subjects/Keywords: Scaphoid; Malunion; Biomechanics; Computational Modelling; Biomechanical modelling.
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APA (6th Edition):
Chambers, S. B. (2019). The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6707
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):
Chambers, Spencer B. “The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation.” 2019. Thesis, University of Western Ontario. Accessed March 02, 2021.
https://ir.lib.uwo.ca/etd/6707.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chambers, Spencer B. “The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation.” 2019. Web. 02 Mar 2021.
Vancouver:
Chambers SB. The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation. [Internet] [Thesis]. University of Western Ontario; 2019. [cited 2021 Mar 02].
Available from: https://ir.lib.uwo.ca/etd/6707.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chambers SB. The Impact of Scaphoid Malunion on Wrist Kinematics & Kinetics: A Biomechanical Investigation. [Thesis]. University of Western Ontario; 2019. Available from: https://ir.lib.uwo.ca/etd/6707
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
18.
Brown, Peter.
Contact Modelling for Forward Dynamics of Human Motion.
Degree: 2017, University of Waterloo
URL: http://hdl.handle.net/10012/11315
► Multibody forward dynamics models of the human body are often used in predictive simulations of human motion. An important component of these models is contact…
(more)
▼ Multibody forward dynamics models of the human body are often used in predictive simulations of human motion. An important component of these models is contact modelling. For example, foot-ground contact plays a crucial role in obtaining accurate results from a walking or running simulation and contact models of joints are necessary to determine accurate joint pressures.
Contact models increase multibody system equation complexity (often dramatically) and can introduce nonlinearities and discontinuities into the system equations. This is particularly problematic in predictive simulations, which may determine optimal performance by running a model simulation thousands of times. A desirable contact model should be accurate enough to recreate physiological motion and contact pressures yet still efficient enough to use in an optimisation.
A suitable contact model for multibody biomechanics is volumetric contact modelling. Volumetric contact modelling is ideally suited for large, conforming contacts, as is found in biomechanic applications, and has relatively simple, analytical equations (provided the contact surfaces can be approximated as simplified shapes). Another advantage is that volumetric contact can be used to calculate contact pressure, which is difficult to do with simpler point-contact models. In this thesis, volumetric contact was used in two biomechanics models to test its applicability: an anatomical knee model with tibiofemoral contact and a foot-ground contact model.
The volumetric knee model was based on another knee model in the literature, with the contact model replaced with volumetric contact. The volumetric model ran faster than real-time and had similar contact forces to the original model. Further improvements are possible by using medical images to determine the contact geometry and including muscles in the model.
A friction model is an important part of some biomechanic contact models, particularly the foot-ground contact model. A literature review revealed that many current friction models introduce discontinuities into system equations or are unnecessarily complex. A novel continuous friction model was developed which uses a minimum number of parameters for easy parametrisation.
A novel, three-dimensional foot-ground contact model was developed and validated, for future use in a human gait simulation. The foot model used volumetric contact equations for ellipsoidal geometry (which were derived in this thesis, as an improvement on previous sphere-plane contact models). A gait experiment was used to parametrise and validate the model (except for the friction parameters). The model ran over 100 times faster than real-time (in an inverse simulation) and matched experimental normal force and centre of pressure location (with less than 7% root-mean-square error).
It was discovered that the designed gait experiment could not be used to determine the friction parameters for the foot-ground model. A possible alternative was suggested, and the validation of the friction portion of the…
Subjects/Keywords: multibody dynamics; biomechanics; contact modelling; friction modelling
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APA ·
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APA (6th Edition):
Brown, P. (2017). Contact Modelling for Forward Dynamics of Human Motion. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11315
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):
Brown, Peter. “Contact Modelling for Forward Dynamics of Human Motion.” 2017. Thesis, University of Waterloo. Accessed March 02, 2021.
http://hdl.handle.net/10012/11315.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brown, Peter. “Contact Modelling for Forward Dynamics of Human Motion.” 2017. Web. 02 Mar 2021.
Vancouver:
Brown P. Contact Modelling for Forward Dynamics of Human Motion. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10012/11315.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brown P. Contact Modelling for Forward Dynamics of Human Motion. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/11315
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Open Universiteit Nederland
19.
Jordans, K (Katalin).
Developing an executable Model of a Protocol for a Systematic Review.
Degree: Master, Department of Information Science, 2020, Open Universiteit Nederland
URL: http://hdl.handle.net/1820/d7e2a9f0-ff4c-496a-a8c2-6a4e531a2d59
► A systematic review is a research method dedicated to collecting and synthesizing available sources to produce new knowledge, which may highly support evidence-based decision making.…
(more)
▼ A systematic review is a research method dedicated to collecting and synthesizing available sources to produce new knowledge, which may highly support evidence-based decision making. The process of a systematic review can be modelled to serve as a guide for the researchers. The systematic review process consists of a planning, conducting and reporting stage, that each contain several steps. This work intends to model a guide to be used by researchers conducting a systematic review. The full process is captured in a goal refinement tree and the elements of the goal refinement tree are used as input for the design of a protocol model. Use cases of the protocol model are presented, based on analyses of abstractions that can be used to design a support system for conducting systematic reviews.
Subjects/Keywords: Systematic Review; Executable Modelling; Protocol Modelling; Protocol
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APA (6th Edition):
Jordans, K. (. (2020). Developing an executable Model of a Protocol for a Systematic Review. (Masters Thesis). Open Universiteit Nederland. Retrieved from http://hdl.handle.net/1820/d7e2a9f0-ff4c-496a-a8c2-6a4e531a2d59
Chicago Manual of Style (16th Edition):
Jordans, K (Katalin). “Developing an executable Model of a Protocol for a Systematic Review.” 2020. Masters Thesis, Open Universiteit Nederland. Accessed March 02, 2021.
http://hdl.handle.net/1820/d7e2a9f0-ff4c-496a-a8c2-6a4e531a2d59.
MLA Handbook (7th Edition):
Jordans, K (Katalin). “Developing an executable Model of a Protocol for a Systematic Review.” 2020. Web. 02 Mar 2021.
Vancouver:
Jordans K(. Developing an executable Model of a Protocol for a Systematic Review. [Internet] [Masters thesis]. Open Universiteit Nederland; 2020. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1820/d7e2a9f0-ff4c-496a-a8c2-6a4e531a2d59.
Council of Science Editors:
Jordans K(. Developing an executable Model of a Protocol for a Systematic Review. [Masters Thesis]. Open Universiteit Nederland; 2020. Available from: http://hdl.handle.net/1820/d7e2a9f0-ff4c-496a-a8c2-6a4e531a2d59
University of Edinburgh
20.
O'Hara, Mhairi.
An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland.
Degree: 2012, University of Edinburgh
URL: http://hdl.handle.net/1842/6276
► This paper describes the development of a model that determines the flow path of lava by processing a DEM and estimates the maximum distance it…
(more)
▼ This paper describes the development of a model that determines the flow path of lava by processing a DEM and estimates the maximum distance it will attain based on the average discharge rate. The effusive eruptions that took place at Hekla in 2000 and Eyjfjallajökull in 2010, at the Fimmvörðuháls site in Iceland are used to validate the model. Results show that the model accurately replicates the paths taken by the lava flows during both events, while the calculated flow lengths from the Hekla 2000 eruption are in extremely good agreement with the real flow fields, with an average accuracy of 94.42%. The Lava Flow model is also used to produce hazard maps for both Hekla and Eyjafjallajökull, by identifying zones on the volcanoes flanks that will confine the lava in the event of an eruption source opening within the boundaries.
Advisors/Committee Members: Thordarson, Thor.
Subjects/Keywords: Modelling; Lava Flows
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APA (6th Edition):
O'Hara, M. (2012). An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland. (Thesis). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/6276
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):
O'Hara, Mhairi. “An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland.” 2012. Thesis, University of Edinburgh. Accessed March 02, 2021.
http://hdl.handle.net/1842/6276.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
O'Hara, Mhairi. “An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland.” 2012. Web. 02 Mar 2021.
Vancouver:
O'Hara M. An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland. [Internet] [Thesis]. University of Edinburgh; 2012. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1842/6276.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
O'Hara M. An Alternative Solution for Modelling Lava Flow Path and Length: applied for hazard assessment at Hekla and Eyjafjallajökull, Iceland. [Thesis]. University of Edinburgh; 2012. Available from: http://hdl.handle.net/1842/6276
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Saskatchewan
21.
MIRSHEKARI, ELHAM.
Extending BACOLI to solve multi-scale problems.
Degree: 2014, University of Saskatchewan
URL: http://hdl.handle.net/10388/ETD-2014-09-1713
► The BACOLI package is a numerical software package for solving parabolic partial differential equations in one spatial dimension. It implements a B-spline collocation method for…
(more)
▼ The BACOLI package is a numerical software package for solving parabolic partial differential
equations in one spatial dimension. It implements a B-spline collocation method for the spatial
discretization of a system of partial differential equations. The resultant ordinary differential equations
together with the boundary conditions form a system of differential-algebraic equations. The
differential-algebraic equations are then solved using the DASSL solver. The BACOLI software package
features adaptive error control in the temporal and spatial domains. The estimate of the temporal
error is controlled through the DASSL solver. The estimate of the spatial error is controlled based
on the difference between two solutions computed in the BACOLI software package. This difference
gives an estimation of the error. If this error estimate does not meet the user-supplied tolerance,
then the spatial mesh is changed.
The BACOLI software package can only solve parabolic partial differential equations that depend
on spatial derivatives. In this thesis, the BACOLI software package is modified to solve a broader
spectrum of problems. In fact, after some modifications, the extended BACOLI software package can
solve systems of parabolic partial differential equations and time-dependent equations that do not
depend on spatial derivatives. We apply this extended software package to solve the monodomain
model of cardiac electrophysiology.
The monodomain model is a multi-scale mathematical model for the evolution of the electrical
potential in cardiac tissue that couples the ionic currents at the cellular scale with their propagation
at the tissue scale. Because of their local nature, the mathematical models of a single cell have no
dependency on spatial derivatives whereas the models at the tissue level do.
The heart models considered in our numerical experiments use various cardiac cell models. We
find that solving the heart models through the extended BACOLI software package, in some cases,
leads to a speed-up in comparison with the Chaste software package, which is a powerful, widely
used, and well-respected software package for heart simulation.
Advisors/Committee Members: Spiteri, Raymond J., Bickis, Mik, Sowa, Artur, Patrick, George, Fairweather, Graeme.
Subjects/Keywords: BACOLI; mathematical modelling
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Manager
APA (6th Edition):
MIRSHEKARI, E. (2014). Extending BACOLI to solve multi-scale problems. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2014-09-1713
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):
MIRSHEKARI, ELHAM. “Extending BACOLI to solve multi-scale problems.” 2014. Thesis, University of Saskatchewan. Accessed March 02, 2021.
http://hdl.handle.net/10388/ETD-2014-09-1713.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
MIRSHEKARI, ELHAM. “Extending BACOLI to solve multi-scale problems.” 2014. Web. 02 Mar 2021.
Vancouver:
MIRSHEKARI E. Extending BACOLI to solve multi-scale problems. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10388/ETD-2014-09-1713.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
MIRSHEKARI E. Extending BACOLI to solve multi-scale problems. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2014-09-1713
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
22.
McCloskey, Jessica.
Modelling Young Star Clusters with AMUSE.
Degree: MSc, 2015, McMaster University
URL: http://hdl.handle.net/11375/18498
► An important research area in modern astrophysics is understanding how molecular clouds form stars and star clusters. These rich clusters within molecular clouds are the…
(more)
▼ An important research area in modern astrophysics is understanding how molecular clouds form stars and star clusters. These rich clusters within molecular clouds are the dominant mode of star formation in our galaxy, but we know very little about these areas of space due to incomplete observational data. The MYStIX (Massive Young Star-Forming Complex Study in Infrared and X-Ray) project was started to create a detailed catalogue of these regions and the rich star clusters embedded within them. Once the observational data was available, the evolution of these clusters could be investigated in more detail. Current cluster simulations investigate the stars in detail but usually ignore the gas entirely which can be inaccurate, especially in gas mass dominated clusters. We use AMUSE (Astrophysical Multi-purpose Software Environment) to model embedded young clusters with stars and gas, similar to those found by the MYStIX project, and track their evolution over the first few million years of their lifespan while allowing the stars and gas to interact. We are particularly interested in non-spheroidal subclusters and how they can evolve into the spherical
structures that we see today.
Thesis
Master of Science (MSc)
Advisors/Committee Members: Sills, Alison, Physics and Astronomy.
Subjects/Keywords: star cluster; modelling
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APA (6th Edition):
McCloskey, J. (2015). Modelling Young Star Clusters with AMUSE. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/18498
Chicago Manual of Style (16th Edition):
McCloskey, Jessica. “Modelling Young Star Clusters with AMUSE.” 2015. Masters Thesis, McMaster University. Accessed March 02, 2021.
http://hdl.handle.net/11375/18498.
MLA Handbook (7th Edition):
McCloskey, Jessica. “Modelling Young Star Clusters with AMUSE.” 2015. Web. 02 Mar 2021.
Vancouver:
McCloskey J. Modelling Young Star Clusters with AMUSE. [Internet] [Masters thesis]. McMaster University; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11375/18498.
Council of Science Editors:
McCloskey J. Modelling Young Star Clusters with AMUSE. [Masters Thesis]. McMaster University; 2015. Available from: http://hdl.handle.net/11375/18498
University of Pretoria
23.
Muller, Jacques.
Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling.
Degree: Materials Science and
Metallurgical Engineering, 2015, University of Pretoria
URL: http://hdl.handle.net/2263/44429
► The tapping of slag and metal is a key operational aspect in high-carbon ferromanganese (HCFeMn) and silicomanganese (SiMn) production. Tapping behaviour can be influenced by…
(more)
▼ The tapping of slag and metal is a key operational
aspect in high-carbon ferromanganese (HCFeMn) and silicomanganese
(SiMn) production. Tapping behaviour can be influenced by taphole
design and the physicochemical properties of the tapped slag and
metal. Unfavourable behaviour includes difficulties during taphole
opening, and sluggish or intermittent slag flow. The slags of
interest here consist mostly of components in the
CaO-MnO-SiO2-Al2O3-MgO system, but differ greatly in MnO content
and basicity due to the different operating practices.
To
evaluate the flow behaviour of these slags from submerged arc
furnaces (SAFs) the latest physicochemical property models were
applied to model viscosity, thermal conductivity, density, and heat
capacity as functions of temperature and typical HCFeMn and SiMn
slag compositions. These property values were applied in a
simplified model of flow through the coke bed and taphole with an
inlet pressure specified. Based on a model from the literature
(Iida et al. 2008), a model was formulated with spherical-radial
flow through the coke bed, being independent of the length of the
fluid path through the coke bed.
The effect of variation in the
slag-metal ratio was investigated, with the focus on tap streams
consisting of only slag. The estimated flow rates were comparable
to those reported elsewhere (Kadkhodabeigi 2011) and found to be
dependent mostly on slag viscosity, which was generally lower for
the typical SiMn slags due to their composition and higher
operating temperature. Furthermore, in most of the cases considered
it was estimated that the flow through the taphole would develop
into laminar flow, with the pressure drop predominantly over the
coke bed. Flow rates were found to be highly dependent on the
taphole diameter and coke bed void fraction, and to lesser extent
on the taphole length and coke bed particle diameter.
Advisors/Committee Members: Pistorius, Chris (advisor), Zietsman, Johan (coadvisor).
Subjects/Keywords: Metallurgy;
Modelling; UCTD
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muller, J. (2015). Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/44429
Chicago Manual of Style (16th Edition):
Muller, Jacques. “Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling.” 2015. Masters Thesis, University of Pretoria. Accessed March 02, 2021.
http://hdl.handle.net/2263/44429.
MLA Handbook (7th Edition):
Muller, Jacques. “Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling.” 2015. Web. 02 Mar 2021.
Vancouver:
Muller J. Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling. [Internet] [Masters thesis]. University of Pretoria; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2263/44429.
Council of Science Editors:
Muller J. Evaluation of
HCFeMn and SiMn Slag Tapping Flow Behaviour Using Physicochemical
Property Modelling and Analytical Flow Modelling. [Masters Thesis]. University of Pretoria; 2015. Available from: http://hdl.handle.net/2263/44429
Victoria University of Wellington
24.
Schebarchov, Dmitri.
Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations.
Degree: 2010, Victoria University of Wellington
URL: http://hdl.handle.net/10063/4424
► A selection of nanoscale processes is studied theoretically, with the aim of identifying themechanisms that could lead to selective carbon nanotube (CNT) growth. Only mechanisms…
(more)
▼ A selection of nanoscale processes is studied theoretically, with the aim of identifying themechanisms that could lead to selective carbon nanotube (CNT) growth. Only mechanisms relevant to catalytic chemical vapour deposition (CVD) are considered. The selected processes are analysed with classical molecular dynamics (MD) simulations and continuum
modelling.
The melting and pre-melting behaviour of supported nickel catalyst particles is investigated. Favourable epitaxy between a nanoparticle and the substrate is shown to significantly raise themelting point of the particle. It is also demonstrated that substrate binding can induce solid-solid transformations, whilst the epitaxy may even determine the orientation of individual crystal planes in supported catalysts. These findings suggest that the substrate crystal structure alone can potentially be used to manipulate the properties of catalyst particles and, hence, influence the structure of CNTs.
The first attempt at
modelling catalyst dewetting, a process where the catalyst unbinds from the inner walls of a nucleating nanotube, is presented. It is argued that understanding this process and gaining control over itmay lead to better selectivity in CNT growth. Two mutually exclusive dewetting mechanisms, namely cap lift-off and capillary withdrawal, are identified and then modelled as elastocapillary phenomena. The
modelling yields an upper bound on the diameter of CNTs that can stem from a catalyst particle of a given size. It is also demonstrated that cap lift-off is sensitive to cap topology, suggesting that it may be possible to link catalyst characteristics to the structural properties of nucleating CNTs. However, a clear link to the chiral vector remains elusive.
It is shown that particle size, as well as binding affinity, plays a critical role in capillary absorption and withdrawal of catalyst nanoparticles. This size dependence is explored in detail, revealing interesting ramifications to the statics and dynamics of capillary-driven flows at the nanoscale. The findings bear significant implications for our understanding of CNT growth from catalyst particles, whilst also suggesting new nanofluidic applications and methods for fabricating composite metal-CNT materials.
Advisors/Committee Members: Hendy, Shaun.
Subjects/Keywords: Modelling; Nanoparticles; Nanotubes
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APA (6th Edition):
Schebarchov, D. (2010). Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/4424
Chicago Manual of Style (16th Edition):
Schebarchov, Dmitri. “Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations.” 2010. Doctoral Dissertation, Victoria University of Wellington. Accessed March 02, 2021.
http://hdl.handle.net/10063/4424.
MLA Handbook (7th Edition):
Schebarchov, Dmitri. “Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations.” 2010. Web. 02 Mar 2021.
Vancouver:
Schebarchov D. Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2010. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10063/4424.
Council of Science Editors:
Schebarchov D. Mechanisms in Carbon Nanotube Growth: Modelling and Molecular Dynamics Simulations. [Doctoral Dissertation]. Victoria University of Wellington; 2010. Available from: http://hdl.handle.net/10063/4424
University of Guelph
25.
Woodrow, Kathryn.
Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes.
Degree: MS, Department of Geography, 2014, University of Guelph
URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8320
► Incorporating topographic detail within advanced hydrological models has been achieved using digital elevation models (DEMs). Although DEMs prove useful for a number of hydrological applications,…
(more)
▼ Incorporating topographic detail within advanced hydrological models has been achieved using digital elevation models (DEMs). Although DEMs prove useful for a number of hydrological applications, they are often the end result of numerous processing steps that contain some amount of uncertainty. These uncertainties greatly influence DEM quality and can further propagate to DEM-derived attributes. This research examines the impacts of DEM grid resolution, elevation source data, and conditioning techniques on the spatial and statistical distribution of field-scale hydrological attributes. Variation in DEM grid resolution and elevation source data resulted in significant differences in the spatial and statistical distributions of variables. The resulting effects of applied conditioning techniques were closely linked to DEM grid resolution; differences in derived attributes among conditioning techniques significantly increased with grid resolution. Greater consideration of DEM conditioning is therefore required at finer-resolutions.
Advisors/Committee Members: Lindsay, John (advisor), Berg, Aaron (advisor).
Subjects/Keywords: DEM; Hydrological Modelling
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APA ·
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MLA ·
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APA (6th Edition):
Woodrow, K. (2014). Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8320
Chicago Manual of Style (16th Edition):
Woodrow, Kathryn. “Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes.” 2014. Masters Thesis, University of Guelph. Accessed March 02, 2021.
https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8320.
MLA Handbook (7th Edition):
Woodrow, Kathryn. “Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes.” 2014. Web. 02 Mar 2021.
Vancouver:
Woodrow K. Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes. [Internet] [Masters thesis]. University of Guelph; 2014. [cited 2021 Mar 02].
Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8320.
Council of Science Editors:
Woodrow K. Evaluating the Effects of DEM Properties on the Spatial and Statistical Distribution of Hydrological Surface Attributes. [Masters Thesis]. University of Guelph; 2014. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8320
University of Cape Town
26.
Nickless, Alecia.
Regional CO₂ flux estimates for South Africa through inverse modelling.
Degree: PhD, Statistical Sciences, 2018, University of Cape Town
URL: http://hdl.handle.net/11427/29703
► Bayesian inverse modelling provides a top-down technique of verifying emissions and uptake of carbon dioxide (CO₂) from both natural and anthropogenic sources. It relies on…
(more)
▼ Bayesian inverse
modelling provides a top-down technique of verifying emissions and uptake of carbon dioxide (CO₂) from both natural and anthropogenic sources. It relies on accurate measurements of CO₂ concentrations at appropriately placed sites and "best-guess" initial estimates of the biogenic and anthropogenic emissions, together with uncertainty estimates. The Bayesian framework improves current estimates of CO₂ fluxes based on independent measurements of CO₂ concentrations while being constrained by the initial estimates of these fluxes. Monitoring, reporting and verification (MRV) is critical for establishing whether emission reducing activities to mitigate the effects of climate change are being effective, and the Bayesian inverse
modelling approach of correcting CO₂ flux estimates provides one of the tools regulators and researchers can use to refine these emission estimates. South Africa is known to be the largest emitter of CO₂ on the African continent. The first major objective of this research project was to carry out such an optimal network design for South Africa. This study used fossil fuel emission estimates from a satellite product based on observations of night-time lights and locations of power stations (Fossil Fuel Data Assimilations System (FFDAS)), and biogenic productivity estimates from a carbon assessment carried out for South Africa to provide the initial CO₂ flux estimates and their uncertainties. Sensitivity analyses considered changes to the covariance matrix and spatial scale of the inversion, as well as different optimisation algorithms, to assess the impact of these specifications on the optimal network solution. This question was addressed in Chapters 2 and 3. The second major objective of this project was to use the Bayesian inverse
modelling approach to obtain estimates of CO₂ fluxes over Cape Town and surrounding area. I collected measurements of atmospheric CO₂ concentrations from March 2012 until July 2013 at Robben Island and Hangklip lighthouses. CABLE (Community Atmosphere Biosphere Land Exchange), a land-atmosphere exchange model, provided the biogenic estimates of CO₂ fluxes and their uncertainties. Fossil fuel estimates and uncertainties were obtained by means of an inventory analysis for Cape Town. As an inventory analysis was not available for Cape Town, this exercise formed an additional objective of the project, presented in Chapter 4. A spatially and temporally explicit, high resolution surface of fossil fuel emission estimates was derived from road vehicle, aviation and shipping vessel count data, population census data, and industrial fuel use statistics, making use of well-established emission factors. The city-scale inversion for Cape Town solved for weekly fluxes of CO₂ emissions on a 1 km × 1 km grid, keeping fossil fuel and biogenic emissions as separate sources. I present these results for the Cape Town inversion under the proposed best available configuration of the Bayesian inversion framework in Chapter 5. Due to the large number of CO₂ sources at this…
Advisors/Committee Members: Rayner, Peter (advisor), Scholes, Bob (advisor), Erni, Birgit (advisor), Underhill, Leslie G (advisor).
Subjects/Keywords: Bayesian inverse modelling
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APA ·
Chicago ·
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CSE |
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APA (6th Edition):
Nickless, A. (2018). Regional CO₂ flux estimates for South Africa through inverse modelling. (Doctoral Dissertation). University of Cape Town. Retrieved from http://hdl.handle.net/11427/29703
Chicago Manual of Style (16th Edition):
Nickless, Alecia. “Regional CO₂ flux estimates for South Africa through inverse modelling.” 2018. Doctoral Dissertation, University of Cape Town. Accessed March 02, 2021.
http://hdl.handle.net/11427/29703.
MLA Handbook (7th Edition):
Nickless, Alecia. “Regional CO₂ flux estimates for South Africa through inverse modelling.” 2018. Web. 02 Mar 2021.
Vancouver:
Nickless A. Regional CO₂ flux estimates for South Africa through inverse modelling. [Internet] [Doctoral dissertation]. University of Cape Town; 2018. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11427/29703.
Council of Science Editors:
Nickless A. Regional CO₂ flux estimates for South Africa through inverse modelling. [Doctoral Dissertation]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/29703
Université de Neuchâtel
27.
Ducommun, Romain.
Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain.
Degree: 2010, Université de Neuchâtel
URL: http://doc.rero.ch/record/20356
► Les méthodes d’estimation et de cartographie de la vulnérabilité de l’eau souterraine ont été jusqu’à présent développées pour les milieux naturels et ruraux. Dans les…
(more)
▼ Les méthodes d’estimation et de cartographie de la
vulnérabilité de l’eau souterraine ont été jusqu’à présent
développées pour les milieux naturels et ruraux. Dans les milieux
urbains, certains éléments spécifiques, comme les conduites
souterraines, la concentration du ruissellement sur les surfaces
imperméables (bitumes, bétons) ou la présence de matériaux
artificiels fortement remaniés dans le sous-sol, ont une influence
notable sur l’infiltration de l’eau en surface et sur la
percolation de l’eau dans la zone non-saturée – processus
participant de la recharge urbaine. La recharge spécifiquement
urbaine des eaux souterraines, ainsi que les perturbations urbaines
de l’écoulement en milieu saturé, doivent donc être inclus dans les
schémas d’estimation de la vulnérabilité, afin de mettre au point
une méthodologie de cartographie de la vulnérabilité adaptée aux
milieux urbains, et ce particulièrement pour la cartographie à
échelle locale. Dans ce but, une étude de la littérature, des
essais de traçage en milieu urbain (Colombier et Neuchâtel, Suisse)
et une série de simulations numériques du milieu urbain ont permis
de mieux cerner l’impact de différents éléments urbains (surfaces
imperméables, conduites souterraines et infrastructures en zone
saturée) sur les écoulements de l’eau en surface et subsurface
urbaines. Les essais de traçages urbains ont permis d’observer les
processus suivants : (1) rôle dual des conduites souterraines sur
la recharge (augmentation ou diminution de la recharge locale, par
exfiltration ou infiltration) ; (2) augmentation de la recharge
suite à la concentration du ruissellement en bordure de surfaces
imperméables ; et (3) augmentation de la recharge en présence de
matériaux artificiels remblayés dans la zone non-saturée. Les
simulations numériques urbaines, réalisées avec deux modèles en
éléments-finis d’échelle spatiale différente (1/3000 et 1/15000),
ont permis de <i>régionaliser</i> l’impact des éléments
urbains sur l’écoulement souterrain. Ces simulations ont montré que
la recharge hétérogène (répartition spatiale selon le type de
surface) a peu d’influence quelle que soit l’échelle
cartographique, et qu’inversement, l’impact des conduites
souterraines est significatif à différentes échelles
cartographiques, même avec des valeurs faibles de facteur de perte.
Les perturbations induites par les infrastructures en zone saturée
ont également été caractérisées, mais sans toutefois pouvoir
établir un lien entre ces perturbations et l’échelle
cartographique. Ces différents résultats ont alors été pris en
compte pour l’établissement d’une méthodologie générale
d’estimation de la vulnérabilité adaptée au milieu urbain, qui
propose notamment de compiler les éléments urbains au sein d’une
carte des <i>processus anthropiques affectant la
recharge</i>. Les indices de cette carte, modulables selon
l’échelle cartographique et/ou la disponibilité en données, et ne
prenant en compte que l’information sur le construit urbain
(indépendante du contexte hydrogéologique), peuvent être superposés
à des indices…
Advisors/Committee Members: François (Dir.), Pierre (Codir.), Alain (Codir.), Jacques (Codir.).
Subjects/Keywords: urban numerical modelling
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Ducommun, R. (2010). Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/20356
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):
Ducommun, Romain. “Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain.” 2010. Thesis, Université de Neuchâtel. Accessed March 02, 2021.
http://doc.rero.ch/record/20356.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ducommun, Romain. “Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain.” 2010. Web. 02 Mar 2021.
Vancouver:
Ducommun R. Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain. [Internet] [Thesis]. Université de Neuchâtel; 2010. [cited 2021 Mar 02].
Available from: http://doc.rero.ch/record/20356.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ducommun R. Estimation et cartographie de la vulnérabilité des eaux
souterraines en milieu urbain. [Thesis]. Université de Neuchâtel; 2010. Available from: http://doc.rero.ch/record/20356
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Università della Svizzera italiana
28.
Sarman, Igor.
Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences.
Degree: 2016, Università della Svizzera italiana
URL: http://doc.rero.ch/record/306726
► The contemporary tourism industry is often forced to face events that represent a threat to individuals’ safety. Life- threatening events pose a challenge to travelers’…
(more)
▼ The contemporary tourism industry is often forced to
face events that represent a threat to individuals’ safety. Life-
threatening events pose a challenge to travelers’ intentions to
plan a leisure trip and influence in a substantive manner human
decisions. Individual sensitivity towards potential hazards show a
great deal of variation among consumers and several tourism
scholars have spent the last years investigating the sources of
heterogeneity in hazard-induced travel decisions. The present PhD
dissertation collects three research articles dealing with tourist
risk perception, hazard-induced travel behaviour and the role of
individual traits in decision-making influenced by potential
hazards. The specific aim of the study is to investigate the
relationship between travel attitudes and hazard-induced risk
perception, and between risk perception and travel choices.
Furthermore, the work intends to assess the differences between
distinct life-threatening hazards and the way in which these
determine travel decisions. For the purpose of empirical analysis,
a structured survey was administered to a sample of university
students. Part of the questionnaire was dedicated to a stated
preference experiment in which individuals had to choose between
hypothetical alternatives of travels characterized by hazards. In
this thesis, advanced econometric techniques – namely, Integrated
Choice and Latent Variable
modelling – are implemented in order to
allow unobservable individual traits to be tested as significant
determinants of travellers’ decisions. The main results highlight
that travel attitudes bear a significant role in shaping risk
perception only for certain types of hazards. The analysis of
stated preferences data show that an increasing level of risk
perception negatively influences the likelihood to travel to
dangerous destinations, but important and significant differences
are present in the sample of respondents.
Advisors/Committee Members: Rico (Dir.).
Subjects/Keywords: Discrete choice modelling
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Export
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Manager
APA (6th Edition):
Sarman, I. (2016). Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences. (Thesis). Università della Svizzera italiana. Retrieved from http://doc.rero.ch/record/306726
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):
Sarman, Igor. “Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences.” 2016. Thesis, Università della Svizzera italiana. Accessed March 02, 2021.
http://doc.rero.ch/record/306726.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sarman, Igor. “Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences.” 2016. Web. 02 Mar 2021.
Vancouver:
Sarman I. Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences. [Internet] [Thesis]. Università della Svizzera italiana; 2016. [cited 2021 Mar 02].
Available from: http://doc.rero.ch/record/306726.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sarman I. Understanding the impact of risk perception in leisure
tourism-related decisions and the role of attitudes and
preferences. [Thesis]. Università della Svizzera italiana; 2016. Available from: http://doc.rero.ch/record/306726
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
29.
Gandhi, Siddharth Nandkumar.
New Avenues in Atmospheric Modelling of Exoplanets.
Degree: PhD, 2020, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/298755
► In this thesis I explore various aspects of atmospheric characterisation of exoplanets with the primary goal of understanding their chemical compositions and physical processes. My…
(more)
▼ In this thesis I explore various aspects of atmospheric characterisation of exoplanets with the primary goal of understanding their chemical compositions and physical processes. My research led to the development of new self-consistent models of exoplanetary atmospheres, a new paradigm for atmospheric retrievals of thermal emission spectra, as well as chemical detections using both high-resolution Doppler spectroscopy as well as low-resolution transit spectroscopy.
I firstly computed the molecular and atomic cross sections of various species prevalent in the atmospheres of such exoplanets in order to compute their spectra. The absorption cross sections were calculated through the broadening of spectral lines obtained from high resolution line lists. These cross sections and subsequent spectral models have led to the detections of numerous chemical species (HCN, TiO, Li, Na, K, CO, and H2O) in the atmospheres of several exoplanets.
Recent advances in observations have heralded the need for accurate models of exoplanetary atmospheres. I have built a new self-consistent atmospheric model, GENESIS, custom built for exoplanets and demonstrated for irradiated and non-irradiated atmospheres over a wide range of atmospheric parameter space. The model treats line-by-line radiative transfer through the Feautrier method and radiative-convective equilibrium through the Rybicki Complete Linearisation method in a plane parallel atmosphere. This model allows for a detailed exploration of radiative processes and chemical compositions and their effects on observed emission spectra. I compared this model against several others in the literature and found good agreement between the atmospheric properties and emission spectra.
Thermal inversions have been seen on the dayside atmospheres of some hot Jupiters and have been predicted to be caused by TiO or VO due to their visible opacity. I used the GENESIS model to investigate the effect of visible opacity and deduced that many new species (AlO, CaO, NaH and MgH), hitherto unexplored, are also capable of causing thermal inversions on hot Jupiters. I have explored the effect of these species as a function of their overall atmospheric abundance as well as determining the required abundance for each of these species to form an inversion. Secondly, I show that a low infrared opacity caused by a low H2O abundance can also lead to strong thermal inversions even with sub-solar abundances of these visible absorbers due to the change in infrared opacity. As a demonstration of this work I have shown that the thermal inversion on WASP-121b can be explained by all the visible absorbers listed above. These thermal inversions are of great importance as the species responsible may be observed with current observational capabilities, thus providing testable observations for these species.
I have also developed a new hybrid retrieval method for exoplanetary emission spectra, HyDRA. This uses the latest atmospheric modelling tools to fit the observed spectra of exoplanet atmospheres. We explore…
Subjects/Keywords: Exoplanets; Atmospheres; Modelling
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gandhi, S. N. (2020). New Avenues in Atmospheric Modelling of Exoplanets. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/298755
Chicago Manual of Style (16th Edition):
Gandhi, Siddharth Nandkumar. “New Avenues in Atmospheric Modelling of Exoplanets.” 2020. Doctoral Dissertation, University of Cambridge. Accessed March 02, 2021.
https://www.repository.cam.ac.uk/handle/1810/298755.
MLA Handbook (7th Edition):
Gandhi, Siddharth Nandkumar. “New Avenues in Atmospheric Modelling of Exoplanets.” 2020. Web. 02 Mar 2021.
Vancouver:
Gandhi SN. New Avenues in Atmospheric Modelling of Exoplanets. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Mar 02].
Available from: https://www.repository.cam.ac.uk/handle/1810/298755.
Council of Science Editors:
Gandhi SN. New Avenues in Atmospheric Modelling of Exoplanets. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/298755
University of Manitoba
30.
Lindgren, Cory John.
Addressing the risks of invasive plants through spatial predictive modelling.
Degree: Environment and Geography, 2010, University of Manitoba
URL: http://hdl.handle.net/1993/18344
► The objective of this dissertation is to extend the use of spatial predictive modelling for use by biosecurity agencies to help prevent the introductions of…
(more)
▼ The objective of this dissertation is to extend the use of spatial predictive
modelling for use by biosecurity agencies to help prevent the introductions of new and emerging invasive plants (i.e., pests). A critical review of international and national policy instruments found that they did not effectively articulate how spatial predictive
modelling could be incorporated into the biosecurity toolbox. To determine how spatial predictive
modelling could be extended I modelled the potential distribution of Tamarix and Lythrum salicaria in Prairie Canada using a genetic algorithm. New seasonal growth data was used to interpolate a growing degree-day’s risk surface for L. salicaria. Models were developed using suites of predictive variables as well as different data partitioning methods and evaluated using different performance measures. Expert evaluation was found to important in final model selection. The results indicated that both invasive plants have yet to reach their potential distribution in Prairie Canada. The spatial models can be used to direct risk-based surveillance efforts and to support biosecurity policy decisions. The results of this dissertation conclude that spatial predictive
modelling is an informative tool that needs to be incorporated into the biosecurity toolbox. A phytosanitary standard is proposed to guide toolbox development.
Advisors/Committee Members: Walker, Dave (Environment and Geography) (supervisor), Watler, Doreen (Environment & Geography) Van Acker, Rene (Plant Science) Jones, Jeanne (Mississippi State University) (examiningcommittee).
Subjects/Keywords: spatial modelling; biosecurity
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lindgren, C. J. (2010). Addressing the risks of invasive plants through spatial predictive modelling. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/18344
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):
Lindgren, Cory John. “Addressing the risks of invasive plants through spatial predictive modelling.” 2010. Thesis, University of Manitoba. Accessed March 02, 2021.
http://hdl.handle.net/1993/18344.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lindgren, Cory John. “Addressing the risks of invasive plants through spatial predictive modelling.” 2010. Web. 02 Mar 2021.
Vancouver:
Lindgren CJ. Addressing the risks of invasive plants through spatial predictive modelling. [Internet] [Thesis]. University of Manitoba; 2010. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1993/18344.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lindgren CJ. Addressing the risks of invasive plants through spatial predictive modelling. [Thesis]. University of Manitoba; 2010. Available from: http://hdl.handle.net/1993/18344
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [419] ▶
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Open Access Theses and Dissertations