subject:(fluctuations)

1. Balde, Hambaliou. Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind.

Degree: Docteur es, Sciences de l'ingénieur, 2011, Evry-Val d'Essonne

URL: http://www.theses.fr/2011EVRY0001

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La plupart des épisodes de pollution atmosphérique intense apparaissent lors des situations des vents faibles. Les modèles de pollution atmosphérique surestiment ou sous-estiment les concentrations… (more)

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La plupart des épisodes de pollution atmosphérique intense apparaissent lors des situations des vents faibles. Les modèles de pollution atmosphérique surestiment ou sous-estiment les concentrations dans ces conditions, en fonction des modèles des écarts-types (σi avec i=x,y,z) de dispersion auxquels ils sont associés. Ceci a été mis en évidence dans la première partie de cette thèse où on a évalué l’efficacité de 5 modèles de dispersion associés à 6 modèles des écarts-types, en se servant de 5 bases des données internationales. Dans la deuxième partie, nous avons développé deux modèles écarts-types de dispersion (S_LMEE_Ond et S_LMEE_Taylor) à partir de bases de données expérimentales appropriées. On a montré ainsi que pour les vents faibles, la vitesse instantanée du vent est non-stationnaire et qu’elle est caractérisée par des fluctuations rapides (aléatoires ou turbulentes) et des fluctuations lentes (organisées). Les fluctuations turbulentes favorisent le mélange des particules à l’intérieur du panache et les fluctuations lentes entrainent leur transport horizontal. Les modèles des écarts-types développés dans cette thèse semblent mieux appropriés pour étudier la dispersion des particules par faibles vents. Le modèle S_LMEE_Taylor est fonction du module moyen de la vitesse du vent (V) et des écarts-types des fluctuations organisées (σu et σv). Des modèles ARX multivariables et autorégressifs ont été développés dans un environnement MATLAB pour la prédiction de ces paramètres avec un horizon de 10 mn et 30 min.

The most intense air pollution episodes occur in situations of low winds. The air pollution models overestimate or underestimate the levels in these conditions, according to models of standard deviations (σi with i = x, y, z) dispersion which they are associated. This was highlighted in the irst part of this thesis where we evaluated the efficacy of five models of dispersal patterns associated with six standard deviations, using five international databases. In the second part, we have developed two models of dispersal standard deviations (S_LMEE_Ond and S_LMEE_Taylor) from experimental databases appropriate. It has been shown and for light winds, the wind speed is non-stationary and ischaracterized by rapid fluctuations (random or turbulent) and slow fluctuations (organized). Turbulent fluctuations promote mixing of particles within the plume and slow fluctuations leading to their horizontal transport. Models of deviations developed in this thesis seem more appropriate to study the dispersion of particles by low winds. The model is based on the module S_LMEE_Taylor average wind speed (V) and standard deviations of fluctuations organized (σu and σv). ARX models and multivariate autoregressive have been developed in MATLAB to predict these parameters with a 10 min and 30 min.

Advisors/Committee Members: Chpoun, Amer (thesis director), Ngae, Pierre (thesis director).

Subjects/Keywords: Fluctuations lentes; Slow fluctuations

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APA (6^th Edition):

Balde, H. (2011). Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind. (Doctoral Dissertation). Evry-Val d'Essonne. Retrieved from http://www.theses.fr/2011EVRY0001

Chicago Manual of Style (16^th Edition):

Balde, Hambaliou. “Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind.” 2011. Doctoral Dissertation, Evry-Val d'Essonne. Accessed December 14, 2019. http://www.theses.fr/2011EVRY0001.

MLA Handbook (7^th Edition):

Balde, Hambaliou. “Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind.” 2011. Web. 14 Dec 2019.

Vancouver:

Balde H. Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind. [Internet] [Doctoral dissertation]. Evry-Val d'Essonne; 2011. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2011EVRY0001.

Council of Science Editors:

Balde H. Modélisation de la pollution atmosphérique de scalaires passifs par faibles vents : Modeling of air pollution by low wind. [Doctoral Dissertation]. Evry-Val d'Essonne; 2011. Available from: http://www.theses.fr/2011EVRY0001

2. Durán Medina, Olmo. Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power.

Degree: Docteur es, Géosciences, Ecologie, Paléontologie, Océanographie, 2016, Université Lille I – Sciences et Technologies

URL: http://www.theses.fr/2016LIL10214

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L’énergie renouvelable générée en sortie de systèmes de production éolienne et hydrolienne est très fluctuante. Ces fortes variations de la puissance sont liées à la… (more)

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L’énergie renouvelable générée en sortie de systèmes de production éolienne et hydrolienne est très fluctuante. Ces fortes variations de la puissance sont liées à la turbulence intrinsèque au vent et aux courants. Ce phénomène est également appelé intermittence et il s’agit d’une contrainte majeure pour le développement de ce type d’énergie. Cette thèse présente l’analyse et la caractérisation de ces fluctuations stochastiques grâce à une approche statistique. Le cadre théorique est celui des cascades d’énergie multifractales. Les outils et méthodes utilisés visent à étudier l’influence de la turbulence pleinement développée sur les turbines horizontales tripales. Cette approche offre une méthode d’analyse multi-échelle de la turbulence, indépendamment de la taille du système considéré. L’analyse spectrale de la vitesse du vent et du courant permet la caractérisation des propriétés scalaires de la turbulence à partir d’une estimation de la dissipation. La décomposition modale empirique offre d’autre part, l’observation de l’interaction multi-échelle entre l’entrée et la sortie de tels systèmes de production. L’étude de l’intermittence de la puissance permet en particulier, la création d’outils de prévision qui reposent sur des bases physiques liées à l’intermittence et à l’invariance d’échelle. Ces outils peuvent répondre au besoin d’adaptation du réseau électrique face aux fluctuations de l’énergie éolienne.

The renewable energy output from wind and tidal turbines generates large fluctuations. Such large power variability are inherent to the turbulent wind and currents nature. This phenomenon is also called intermittency and it is a major obstacle for the development of this kind of energy. This thesis presents the analysis and characterization of stochastic fluctuations through a statistical approach. The theoretical framework is the multifractal energy cascades. The tools and methods aim to study the influence of the fully developed turbulence on a three-blade horizontal axis turbine. This approach provides a method for multiscale turbulence analysis, regardless the size of the considered system. The spectral analysis of wind and current velocity allows the characterization of flow scaling properties from a dissipation estimate. The Empirical Mode Decomposition offers on the other hand, an observation of the multiscale interaction between the input and output of such energy production systems. The study of the power intermittency allows in particular the conception of forecasting tools based on physical principles related to intermittency and to scaling. These tools are able to provide a solution for grid adaptation facing the wind and tidal energy fluctuations.

Advisors/Committee Members: Schmitt, François (thesis director), Calif, Rudy (thesis director).

Subjects/Keywords: Fluctuations stochastiques; 532.517

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APA (6^th Edition):

Durán Medina, O. (2016). Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2016LIL10214

Chicago Manual of Style (16^th Edition):

Durán Medina, Olmo. “Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power.” 2016. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed December 14, 2019. http://www.theses.fr/2016LIL10214.

MLA Handbook (7^th Edition):

Durán Medina, Olmo. “Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power.” 2016. Web. 14 Dec 2019.

Vancouver:

Durán Medina O. Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2016. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2016LIL10214.

Council of Science Editors:

Durán Medina O. Etude expérimentale et modélisation stochastique des fluctuations de la vitesse (vent et courant) et de la puissance électrique : Experimental study and stochastic modelization of velocity fluctuations (wind and marine energy) and electrical power. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2016. Available from: http://www.theses.fr/2016LIL10214

Université de Sherbrooke

3. Laliberté, Francis. Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons .

Degree: 2013, Université de Sherbrooke

URL: http://savoirs.usherbrooke.ca/handle/11143/58

► D'une part, l'effet Nernst est connu pour être sensible aux fluctuations supraconductrices, c'est-à-dire aux manifestations de l'état supraconducteur à des températures supérieures à la température… (more)

Subjects/Keywords: Supraconducteur; Cuprates; Effet Nernst; Fluctuations

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APA (6^th Edition):

Laliberté, F. (2013). Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons . (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://savoirs.usherbrooke.ca/handle/11143/58

Chicago Manual of Style (16^th Edition):

Laliberté, Francis. “Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons .” 2013. Doctoral Dissertation, Université de Sherbrooke. Accessed December 14, 2019. http://savoirs.usherbrooke.ca/handle/11143/58.

MLA Handbook (7^th Edition):

Laliberté, Francis. “Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons .” 2013. Web. 14 Dec 2019.

Vancouver:

Laliberté F. Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons . [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2013. [cited 2019 Dec 14]. Available from: http://savoirs.usherbrooke.ca/handle/11143/58.

Council of Science Editors:

Laliberté F. Fluctuations supraconductrices comme source de l'effet Nernst dans un cuprate dopé en électrons . [Doctoral Dissertation]. Université de Sherbrooke; 2013. Available from: http://savoirs.usherbrooke.ca/handle/11143/58

Iowa State University

4. Zhang, Junhua. Theory of spin-fluctuation induced superconductivity in iron-based superconductors.

Degree: 2011, Iowa State University

URL: https://lib.dr.iastate.edu/etd/10251

► In this dissertation we focus on the investigation of the pairing mechanism in the recently discovered high-temperature superconductor, iron pnictides. Due to the proximity to… (more)

▼ In this dissertation we focus on the investigation of the pairing mechanism in the recently discovered high-temperature superconductor, iron pnictides. Due to the proximity to magnetic instability of the system, we considered short-range spin fluctuations as the major mediating source to induce superconductivity. Our calculation supports the magnetic fluctuations as a strong candidate that drives Cooper-pair formation in this material. We find the corresponding order parameter to be of the so-called sign-reversed s wave type and show its evolution with temperature as well as the capability of supporting high transition temperature up to several tens of Kelvin. On the other hand, our itinerant model calculation shows pronounced spin correlation at the observed antiferromagnetic ordering wave vector, indicating the underlying electronic structure in favor of antiferromagnetic state. Therefore, the electronic degrees of freedom could participate both in the magnetic and in the superconducting properties. Our work shows that the interplay between magnetism and superconductivity plays an important role to the understanding of the rich physics in this material. The magnetic-excitation spectrum carries important information on the nature of magnetism and the characteristics of superconductivity. We analyze the spin excitation spectrum in the normal and superconducting states of iron pnictides in the magnetic scenario. As a consequence of the sign-reversed gap structure obtained in the above, a spin resonance mode appears below the superconducting transition temperature. The calculated resonance energy, scaled with the gap magnitude and the magnetic correlation length, agrees well with the inelastic neutron scattering (INS) measurements. More interestingly, we find a common feature of those short-range spin fluctuations that are capable of inducing a fully gapped sy state is the momentum anisotropy with elongated span along the direction transverse to the antiferromagnetic momentum transfer. This calculated intrinsic anisotropy exists both in the normal and in the superconducting state, which naturally explains the elliptically shaped magnetic responses observed in INS experiments. Our detailed calculation further shows that the magnetic resonance mode exhibits an upward dispersion-relation pattern but anisotropic along the transverse and longitudinal directions. We also perform a qualitative analysis on the relationship between the anisotropic momentum structure of the magnetic fluctuations and the stability of superconducting phase by intraorbital but interband pair scattering to show the consistency of the magnetic mechanism for superconductivity. As discussed for cuprates, an important identification of the mediating boson is from the fermionic spectrum. We study the spectral function in the normal and superconducting state. Not only do we extract the gap magnitude on the electron- and hole-pockets to show the momentum structure of the gap, but also find a peak-dip-hump feature in the electron spectrum, which reflects…

Subjects/Keywords: spin fluctuations; unconventional superconductors; Physics

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APA (6^th Edition):

Zhang, J. (2011). Theory of spin-fluctuation induced superconductivity in iron-based superconductors. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10251

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

Chicago Manual of Style (16^th Edition):

Zhang, Junhua. “Theory of spin-fluctuation induced superconductivity in iron-based superconductors.” 2011. Thesis, Iowa State University. Accessed December 14, 2019. https://lib.dr.iastate.edu/etd/10251.

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

MLA Handbook (7^th Edition):

Zhang, Junhua. “Theory of spin-fluctuation induced superconductivity in iron-based superconductors.” 2011. Web. 14 Dec 2019.

Vancouver:

Zhang J. Theory of spin-fluctuation induced superconductivity in iron-based superconductors. [Internet] [Thesis]. Iowa State University; 2011. [cited 2019 Dec 14]. Available from: https://lib.dr.iastate.edu/etd/10251.

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

Council of Science Editors:

Zhang J. Theory of spin-fluctuation induced superconductivity in iron-based superconductors. [Thesis]. Iowa State University; 2011. Available from: https://lib.dr.iastate.edu/etd/10251

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

George Mason University

5. Rahimi, Amanda. Influence of Situational Variables on Changes in State Body Image Among Black and White Women .

Degree: 2010, George Mason University

URL: http://hdl.handle.net/1920/5811

► Although research suggests that body esteem varies according to daily experiences (Melnyk, Cash, & Janda, 2004; Tiggemann, 2001), few studies have examined situational variables that… (more)

▼ Although research suggests that body esteem varies according to daily experiences (Melnyk, Cash, & Janda, 2004; Tiggemann, 2001), few studies have examined situational variables that may lead to fluctuations in body satisfaction. Of the limited experimental research, results suggest that a variety of experiences, including interpersonal feedback, clothing selection, and media exposure, may trigger changes in body esteem (Grabe, Ward, & Hyde, 2008; Kwon & Shim, 1999; Mills & Miller, 2007). The main goal of this study was to examine within-person variability of state body image and situational experiences that influence changes in state body image among college women in their everyday lives. A secondary aim was to examine how race and appearance investment moderate this effect. A pilot study was conducted to examine situational experiences related to changes in body esteem. Eleven Black American (BA) and 11 White American (WA) women recorded their body experiences and feelings in a journal for one week and results were used to create a simple checklist that was used in the main study. Participants in the main study included 40 BA and 42 WA undergraduate women (ages 18-28). Participants completed a measure of appearance investment on Day 1, and a state body image measure and a situational experience checklist online twice daily for the next seven days. Results were analyzed using hierarchical linear modeling (HLM), a method that accounts for nonindependence of observations. Findings revealed considerable within-person variability in body image. Every event type was uniquely associated with changes in body image except dissatisfaction while exercising. All of the interactions between race and situational variables were nonsignificant, indicating that the association between situational experiences and changes in state body image did not depend on an individual’s race. Appearance investment was only found to be a significant moderator of the association between state body image and exercise dissatisfaction. Potential limitations of these findings are discussed along with suggestions for future research examining the effects of positive and negative experiences on state body image. Advisors/Committee Members: Mohr, Jonathan J (advisor).

Subjects/Keywords: body image; experiences; fluctuations; race

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APA (6^th Edition):

Rahimi, A. (2010). Influence of Situational Variables on Changes in State Body Image Among Black and White Women . (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/5811

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

Chicago Manual of Style (16^th Edition):

Rahimi, Amanda. “Influence of Situational Variables on Changes in State Body Image Among Black and White Women .” 2010. Thesis, George Mason University. Accessed December 14, 2019. http://hdl.handle.net/1920/5811.

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

MLA Handbook (7^th Edition):

Rahimi, Amanda. “Influence of Situational Variables on Changes in State Body Image Among Black and White Women .” 2010. Web. 14 Dec 2019.

Vancouver:

Rahimi A. Influence of Situational Variables on Changes in State Body Image Among Black and White Women . [Internet] [Thesis]. George Mason University; 2010. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/1920/5811.

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

Council of Science Editors:

Rahimi A. Influence of Situational Variables on Changes in State Body Image Among Black and White Women . [Thesis]. George Mason University; 2010. Available from: http://hdl.handle.net/1920/5811

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

University of Ghana

6. Boateng, J.O. The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana.

Degree: 2019, University of Ghana

URL: http://ugspace.ug.edu.gh/handle/123456789/32766

► The Ghanaian economy has for some time witnessed a seemingly unstable exchange rate. The strength of the cedi against the dollar has been fluctuating for… (more)

Subjects/Keywords: Exchange Rate; Fluctuations; Financial Performance

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APA (6^th Edition):

Boateng, J. O. (2019). The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana. (Masters Thesis). University of Ghana. Retrieved from http://ugspace.ug.edu.gh/handle/123456789/32766

Chicago Manual of Style (16^th Edition):

Boateng, J O. “The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana. ” 2019. Masters Thesis, University of Ghana. Accessed December 14, 2019. http://ugspace.ug.edu.gh/handle/123456789/32766.

MLA Handbook (7^th Edition):

Boateng, J O. “The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana. ” 2019. Web. 14 Dec 2019.

Vancouver:

Boateng JO. The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana. [Internet] [Masters thesis]. University of Ghana; 2019. [cited 2019 Dec 14]. Available from: http://ugspace.ug.edu.gh/handle/123456789/32766.

Council of Science Editors:

Boateng JO. The Impact of Exchange Rate Fluctuations on Firms Financial Performance: A Case Study of Some Selected Manufacturing Firms in Ghana. [Masters Thesis]. University of Ghana; 2019. Available from: http://ugspace.ug.edu.gh/handle/123456789/32766

Indian Institute of Science

7. Sharma, Rati. Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems.

Degree: 2013, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3338 ; http://etd.iisc.ernet.in/abstracts/4203/G25732-Abst.pdf

► The goal of this thesis has been to throw light on a selection of open problems in chemical and biological physics using the general principles… (more)

▼ The goal of this thesis has been to throw light on a selection of open problems in chemical and biological physics using the general principles of statistical mechanics. These problems are all broadly concerned with the role of fluctuations in the dynamics of macromolecular systems. More specifically, they are concerned with identifying the microscopic roots of a number of interesting and unusual effects, including fractional viscoelasticity, anomalous chain cyclization dynamics in crowded environments, subdifffusion in hair bundles, symmetries in the work distributions of stretched polymers, heterogeneities in the geometries of reptation channels in polymer melts, and non-Gaussianity in the distributions of the end products of gene expression. I have shown here that all these effects are expressions of essentially the same underlying process of stochasticity, which can be described in terms of the dynamics of a point particle or a continuous curve that evolves in simple potentials under the action of white or colored Gaussian noise [8]. I have also shown that this minimal model of time-dependent behavior in condensed phases is amenable to analysis, often exactly, by path integral methods [13-15], which are naturally suited to the treatment of random processes in many-body physics. The results of such analyses are theoretical expressions for various experimentally measured quantities, comparisons with which form the basis for developing physical intuition about the phenomena under study. The general success of this approach to the study of stochasticity in biophysics and molecular biology holds out hopes of its application to other unsolved problems in these fields. These include electrical transport in DNA [143], quantum coherence in photosynthesis [144], power generation in molecular motors [145], cell signaling and chemotaxis [146], space dependent diffusion [147], and self-organization of active matter [148], to name a few. Most of these problems are characterized by non-linearities of one kind or another, so they add a new layer of complexity to the problems considered in this thesis. Although path integral and related field theoretic methods are equipped to handle such complexities, the attendant calculations are expected to be non-trivial, and the challenge to theory will be to devise effective approximation schemes for these methods, or to develop new and more sophisticated methods altogether. Advisors/Committee Members: Cherayil, Binny J.

Subjects/Keywords: Polymers; Polymers - Fluctuations; Polymers - Conformational Fluctuations; Polymers - Thermodynamic Fluctuations; Polymers - Number Fluctuations; Polymer Solutions - Tube Width Fluctuations; Polymer Dynamics; Polymer Melt Dynamics; Macromolecular Assemblies - Fluctuations; Protein Conformational Fluctuations; Elastic Dumbbell Model; Polymeric Systems - Fluctuations; Viscoelasticity; Organic Chemistry

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APA (6^th Edition):

Sharma, R. (2013). Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3338 ; http://etd.iisc.ernet.in/abstracts/4203/G25732-Abst.pdf

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

Chicago Manual of Style (16^th Edition):

Sharma, Rati. “Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems.” 2013. Thesis, Indian Institute of Science. Accessed December 14, 2019. http://etd.iisc.ernet.in/2005/3338 ; http://etd.iisc.ernet.in/abstracts/4203/G25732-Abst.pdf.

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

MLA Handbook (7^th Edition):

Sharma, Rati. “Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems.” 2013. Web. 14 Dec 2019.

Vancouver:

Sharma R. Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems. [Internet] [Thesis]. Indian Institute of Science; 2013. [cited 2019 Dec 14]. Available from: http://etd.iisc.ernet.in/2005/3338 ; http://etd.iisc.ernet.in/abstracts/4203/G25732-Abst.pdf.

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

Council of Science Editors:

Sharma R. Theoretical Approaches to the Study of Fluctuation Phenomena in Various Polymeric Systems. [Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ernet.in/2005/3338 ; http://etd.iisc.ernet.in/abstracts/4203/G25732-Abst.pdf

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

8. Dakos, Thomas. Fundamental heat transfer studies in grid generated homogeneous turbulence.

Degree: PhD, 1990, Imperial College London

URL: http://hdl.handle.net/10044/1/47835

Subjects/Keywords: 532; Temperature fluctuations; Velocity fluctuations

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APA (6^th Edition):

Dakos, T. (1990). Fundamental heat transfer studies in grid generated homogeneous turbulence. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/47835

Chicago Manual of Style (16^th Edition):

Dakos, Thomas. “Fundamental heat transfer studies in grid generated homogeneous turbulence.” 1990. Doctoral Dissertation, Imperial College London. Accessed December 14, 2019. http://hdl.handle.net/10044/1/47835.

MLA Handbook (7^th Edition):

Dakos, Thomas. “Fundamental heat transfer studies in grid generated homogeneous turbulence.” 1990. Web. 14 Dec 2019.

Vancouver:

Dakos T. Fundamental heat transfer studies in grid generated homogeneous turbulence. [Internet] [Doctoral dissertation]. Imperial College London; 1990. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10044/1/47835.

Council of Science Editors:

Dakos T. Fundamental heat transfer studies in grid generated homogeneous turbulence. [Doctoral Dissertation]. Imperial College London; 1990. Available from: http://hdl.handle.net/10044/1/47835

Arizona State University

9. Ashraf, Nabil Shovon. Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions.

Degree: PhD, Electrical Engineering, 2011, Arizona State University

URL: http://repository.asu.edu/items/14271

► In very small electronic devices the alternate capture and emission of carriers at an individual defect site located at the interface of Si:SiO2 of a… (more)

▼ In very small electronic devices the alternate capture and emission of carriers at an individual defect site located at the interface of Si:SiO2 of a MOSFET generates discrete switching in the device conductance referred to as a random telegraph signal (RTS) or random telegraph noise (RTN). In this research work, the integration of random defects positioned across the channel at the Si:SiO2 interface from source end to the drain end in the presence of different random dopant distributions are used to conduct Ensemble Monte-Carlo ( EMC ) based numerical simulation of key device performance metrics for 45 nm gate length MOSFET device. The two main performance parameters that affect RTS based reliability measurements are percentage change in threshold voltage and percentage change in drain current fluctuation in the saturation region. It has been observed as a result of the simulation that changes in both and values moderately decrease as the defect position is gradually moved from source end to the drain end of the channel. Precise analytical device physics based model needs to be developed to explain and assess the EMC simulation based higher VT fluctuations as experienced for trap positions at the source side. A new analytical model has been developed that simultaneously takes account of dopant number variations in the channel and depletion region underneath and carrier mobility fluctuations resulting from fluctuations in surface potential barriers. Comparisons of this new analytical model along with existing analytical models are shown to correlate with 3D EMC simulation based model for assessment of VT fluctuations percentage induced by a single interface trap. With scaling of devices beyond 32 nm node, halo doping at the source and drain are routinely incorporated to combat the threshold voltage roll-off that takes place with effective channel length reduction. As a final study on this regard, 3D EMC simulation method based computations of threshold voltage fluctuations have been performed for varying source and drain halo pocket length to illustrate the threshold voltage fluctuations related reliability problems that have been aggravated by trap positions near the source at the interface compared to conventional 45 nm MOSFET.

Subjects/Keywords: Electrical engineering; Ensemble Monte Carlo simulation; Interface trap; On-current fluctuations; Random dopant fluctuations; Random telegraph noise; Threshold voltage fluctuations

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

APA (6^th Edition):

Ashraf, N. S. (2011). Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions. (Doctoral Dissertation). Arizona State University. Retrieved from http://repository.asu.edu/items/14271

Chicago Manual of Style (16^th Edition):

Ashraf, Nabil Shovon. “Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions.” 2011. Doctoral Dissertation, Arizona State University. Accessed December 14, 2019. http://repository.asu.edu/items/14271.

MLA Handbook (7^th Edition):

Ashraf, Nabil Shovon. “Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions.” 2011. Web. 14 Dec 2019.

Vancouver:

Ashraf NS. Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions. [Internet] [Doctoral dissertation]. Arizona State University; 2011. [cited 2019 Dec 14]. Available from: http://repository.asu.edu/items/14271.

Council of Science Editors:

Ashraf NS. Comparative Analysis of Simulation of Trap Induced Threshold Voltage Fluctuations for 45 nm Gate Length n-MOSFET and Analytical Model Predictions. [Doctoral Dissertation]. Arizona State University; 2011. Available from: http://repository.asu.edu/items/14271

University of KwaZulu-Natal

10. [No author]. Simulating thermal fluctuations in soft matter models.

Degree: 2015, University of KwaZulu-Natal

URL: http://hdl.handle.net/10413/13982

► The research carried out in this work is in two parts: In the first part, we derive a configurational temperature Nosé-Hoover thermostat by reformulating the… (more)

Subjects/Keywords: Solids – Fluctuations.; Condensed matter.; Molecular dynamics.; Physics.

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APA (6^th Edition):

author], [. (2015). Simulating thermal fluctuations in soft matter models. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/13982

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

Chicago Manual of Style (16^th Edition):

author], [No. “Simulating thermal fluctuations in soft matter models. ” 2015. Thesis, University of KwaZulu-Natal. Accessed December 14, 2019. http://hdl.handle.net/10413/13982.

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

MLA Handbook (7^th Edition):

author], [No. “Simulating thermal fluctuations in soft matter models. ” 2015. Web. 14 Dec 2019.

Vancouver:

author] [. Simulating thermal fluctuations in soft matter models. [Internet] [Thesis]. University of KwaZulu-Natal; 2015. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10413/13982.

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

Council of Science Editors:

author] [. Simulating thermal fluctuations in soft matter models. [Thesis]. University of KwaZulu-Natal; 2015. Available from: http://hdl.handle.net/10413/13982

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

Indian Institute of Science

11. Nagapriya, K S. Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules.

Degree: 2006, Indian Institute of Science

URL: http://hdl.handle.net/2005/396

► The aim of this thesis is to study the energy fluctuations (leading to thermal fluctuations) during thermal and enzymatic denaturation of biological molecules and to… (more)

▼ The aim of this thesis is to study the energy fluctuations (leading to thermal fluctuations) during thermal and enzymatic denaturation of biological molecules and to study the variation in fluctuations between simple molecules like the DNA (which have only a secondary structure) to molecules with higher order structures and packaging. We have developed a new technique - Thermal Fluctuation Spectroscopy (TFS) to study these fluctuations. The technique of Thermal Fluctuation Spectroscopy (TFS) is a combination of microcalorimetry and noise measurement techniques. The combination of these two powerful techniques has never been exploited before. In this technique any energy exchange between sample and the substrate is reflected as a thermal fluctuation of the substrate. The system resolution is few parts per billion (ppb) and fluctuations in energy ~ 100nJ (which correspond to temperature fluctuations ~ K) can be measured. Chromatin is the basic building block of chromosome and this thesis focuses on the constituents this fundamental building block - DNA, histones and nucleosomes. Heteropolymeric dsDNA shows extremely large non-Gaussian fluctuation around its melting temperature. For homopolymeric DNA the fluctuations during denaturation are smaller. The thermal fluctuation during denaturation of a heteropolymer in buffer is several orders larger than when the DNA is on a substrate while that for a homopolymer is comparable in both cases. Our measurements established that heteropolymeric dsDNA denaturation occurs in two stages. Initially, at around 330 K, bubbles are formed in the AT rich regions. At higher temperatures, the GC rich regions binding them denature in a cooperative transition causing extremely large fluctuations. TFS on histone monomers showed that H1 monomer shows an increase in thermal fluctuation in the temperature range studied, while the core histones did not. We infer that this is due to the fact that the core histones may not be properly folded when they exist as monomers. It was seen that H1 crosses an energy barrier of 17 kcal/mol to go from its native to denatured state. The transition was kinetically driven with a fixed barrier till 352 K. At 352K, the barrier softened by ~ 1 kcal/mol leading to faster denaturation. The core histones when assembled as dimers/oligomers showed an increase in fluctuation at temperatures below 350 K. The assembling of these histones and DNA into a mononucleosome causes a very large increase in fluctuation over the entire temperature range studied. TFS showed that the fluctuation during mononucleosome denaturation was much larger than a simple sum of the fluctuations of its constituents. From the data we were able to identify that the denaturation starts with dissociation and unfolding of the core histones and the denaturation of AT rich regions of the DNA which leads to the breaking of some of the histone-DNA contacts. At higher temperatures the linker histone H1 and the GC rich regions of the DNA denature, leading to a collapse of the entire nucleosome… Advisors/Committee Members: Raychaudhuri, A K.

Subjects/Keywords: Energy Fluctuations; Thermal Fluctuation Spectroscopy (TFS); Gene expression; Biomolecules - Denaturation; DNA - Thermal Fluctuations; Histones - Thermal Fluctuations; Nucleosomes - Thermal Fluctuations; Thermal Denaturation; Biophysics

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

APA (6^th Edition):

Nagapriya, K. S. (2006). Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/396

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

Chicago Manual of Style (16^th Edition):

Nagapriya, K S. “Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules.” 2006. Thesis, Indian Institute of Science. Accessed December 14, 2019. http://hdl.handle.net/2005/396.

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

MLA Handbook (7^th Edition):

Nagapriya, K S. “Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules.” 2006. Web. 14 Dec 2019.

Vancouver:

Nagapriya KS. Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules. [Internet] [Thesis]. Indian Institute of Science; 2006. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/2005/396.

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

Council of Science Editors:

Nagapriya KS. Thermal Fluctuation Spectroscopy And Its Application In The Study Of Biomolecules. [Thesis]. Indian Institute of Science; 2006. Available from: http://hdl.handle.net/2005/396

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

University of Alberta

12. Postma, Jonathan Victor. Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing.

Degree: PhD, Department of Earth and Atmospheric Sciences, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/cvx021f24c

► An interaction by exchange with the conditional mean (IECM) micromixing model is coupled to a three-dimensional single-particle Lagrangian stochastic (LS) model to estimate concentration fluctuations… (more)

▼ An interaction by exchange with the conditional mean (IECM) micromixing model is coupled to a three-dimensional single-particle Lagrangian stochastic (LS) model to estimate concentration fluctuations in plumes of a passive (i.e., non-buoyant), non-reactive (i.e., no chemistry) tracer dispersing from a variety of source configurations in four neutrally stratified flows: a horizontally-homogeneous wall shear layer flow; a horizontally-homogeneous representation of the Tombstone canopy flow; a three-dimensional inhomogeneous representation of the Tombstone canopy flow; and a three-dimensional inhomogeneous representation of the Mock Urban Setting Trials (MUST) canopy flow. The IECM micromixing model incorporates the combined effects of turbulent and molecular mixing on particle concentration. This allows the numerical estimation of all moments of the scalar concentration field, which is a significant advance over traditional LS models given that concentration fluctuations are a ubiquitous feature of a dispersing plume. The single-particle implementation of the LS-IECM model is based upon a previously reported implementation that used simultaneously computed particle trajectories to estimate the conditional mean concentration field [Cassiani, M. A., Franzese, P. A. and Giostra, U. A.: 2005, A PDF micromixing model of dispersion for atmospheric flow. Part I: development of model, application to homogeneous turbulence and to a neutral boundary layer, Atmospheric Environment 39, 1457-1469]. The model used in this thesis pre-calculates the conditional mean concentration field with an LS model for use with the IECM model, which runs as a separate simulation. The principal advantage of this single-particle approach is the performance increase on parallel computer architecture, which scales directly with the number of processors. The simulations presented in this thesis go beyond those performed with the previous model by considering three-dimensional inhomogeneous flows, as well as one-dimensional horizontally-homogeneous flows. The accuracy of the LS-IECM model was good for the flows with horizontal-homogeneity, and comparable to the results of previous simulations from older models. Rogue velocities in the simulations utilising inhomogeneous flow statistics resulted in acceptable to poor accuracy in these simulations. Suggestions for improvements to the model are made.

Subjects/Keywords: turbulent dispersion; concentration fluctuations; canopy flow

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

APA (6^th Edition):

Postma, J. V. (2010). Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cvx021f24c

Chicago Manual of Style (16^th Edition):

Postma, Jonathan Victor. “Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing.” 2010. Doctoral Dissertation, University of Alberta. Accessed December 14, 2019. https://era.library.ualberta.ca/files/cvx021f24c.

MLA Handbook (7^th Edition):

Postma, Jonathan Victor. “Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing.” 2010. Web. 14 Dec 2019.

Vancouver:

Postma JV. Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing. [Internet] [Doctoral dissertation]. University of Alberta; 2010. [cited 2019 Dec 14]. Available from: https://era.library.ualberta.ca/files/cvx021f24c.

Council of Science Editors:

Postma JV. Modelling concentration fluctuations in plumes dispersing in urban canopy flows within a single-particle lagrangian description for turbulent and molecular mixing. [Doctoral Dissertation]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/cvx021f24c

University of Pretoria

13. Scheepers, Deon. Applications and portfolio theory in the South African agricultural derivatives market.

Degree: Agricultural Economics, Extension and Rural Development, 2008, University of Pretoria

URL: http://hdl.handle.net/2263/24682

► South African agriculture experienced rapid deregulation during the 1990s as the one channel marketing boards were dismantled. For the grains industry this meant the rapid… (more)

▼ South African agriculture experienced rapid deregulation during the 1990s as the one channel marketing boards were dismantled. For the grains industry this meant the rapid development of a derivatives market (SAFEX). Derivative markets are surely the most intriguing and complex financial markets with the most misunderstood and riskiest instruments of all financial markets. Their complexity also caused its fair share of problems within the South African scenario with the inception of SAFEX in 1996/97. Not only is this type of market complex but it also creates huge fluctuations in the portfolio value of a derivatives linked portfolio. It is precisely this type of fluctuations and exposure that can be controlled and managed to the preferred level of risk by the correct and responsible application of these instruments. The successful application of these instruments depends greatly on the fact that the underlying market should be an efficient market which will then in turn allow for cost effective pricing of these instruments and ultimately lead to successful product structuring. The South African agricultural derivatives market was tested for efficiency by using a co-integration analysis which proved market efficiency. Once market efficiency was established it allowed for the structuring of marketing portfolios which ultimately resulted in a rule of thumb marketing strategy for maize producers. The strategy required the maize producer to fix a price during planting period for delivery in July the following year. In order for the producer to benefit from any potential upside during the season between price fixing and delivery the producer should buy a call option with an expiry date of the month of March following planting. This will save him at least four months worth of time value on the option premium. This study also acknowledged the fact that the derivatives market in South Africa is still in its fledgling phase and realises the vast potential for risk reduction through radical innovation by creating and mixing the basic positions of derivatives. This study illustrates by way of examples a few approaches in structured products. In an attempt to achieve successful product development the study applied portfolio theory as a means to quantify risk by using mean return and portfolio variance parameters. It addressed the more obvious price risk situation which is faced by all grain producers by developing a rule of thumb marketing strategy for farmers. The more complex situation of emerging agriculture was also considered where the objective was to enable a small scale producer to benefit from the risk reduction potential of these instruments. At the same time it would also allow them to access production credit without a traditional balance sheet while allowing the financier to be ring fenced from the risk of price fluctuation on the clients profit profile. A more adventures approach was followed for the dairy industry by creating a proxy price for milk based on the maize price of SAFEX in an attempt to encourage an… Advisors/Committee Members: Prof J F Kirsten (advisor).

Subjects/Keywords: Derivatives market; Financial market; Fluctuations; UCTD

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

APA (6^th Edition):

Scheepers, D. (2008). Applications and portfolio theory in the South African agricultural derivatives market. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/24682

Chicago Manual of Style (16^th Edition):

Scheepers, Deon. “Applications and portfolio theory in the South African agricultural derivatives market.” 2008. Masters Thesis, University of Pretoria. Accessed December 14, 2019. http://hdl.handle.net/2263/24682.

MLA Handbook (7^th Edition):

Scheepers, Deon. “Applications and portfolio theory in the South African agricultural derivatives market.” 2008. Web. 14 Dec 2019.

Vancouver:

Scheepers D. Applications and portfolio theory in the South African agricultural derivatives market. [Internet] [Masters thesis]. University of Pretoria; 2008. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/2263/24682.

Council of Science Editors:

Scheepers D. Applications and portfolio theory in the South African agricultural derivatives market. [Masters Thesis]. University of Pretoria; 2008. Available from: http://hdl.handle.net/2263/24682

University of Nairobi

14. Sewe, Kevin O. The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange .

Degree: 2016, University of Nairobi

URL: http://hdl.handle.net/11295/99694

► The stock market serves to symbolize the performance and well-being of the economy and is tracked as an indicator of overall economic activity. The effects… (more)

▼ The stock market serves to symbolize the performance and well-being of the economy and is tracked as an indicator of overall economic activity. The effects of various macroeconomic indicators on the stock exchange have been evaluated in numerous studies over the years. This study sought to establish the nature of the interaction between foreign exchange fluctuations and their impact on equity market performance at the Nairobi Securities Exchange. Previous studies have offered up mixed results as to the direction of this relationship. A correlational research design was drawn up with the NSE 20 Share Index as the dependent variable representing market performance; the Kenya Shilling-US Dollar exchange rate served as the independent variable representing exchange rate fluctuations. The paper employed monthly time series data covering a 10-year span, dating from July 2006 until June 2016. The exchange rate and market performance were found to be asymmetric and not follow a normal distribution, instead they were found to follow leptokurtic distributions; such a distribution has fat tails and the data points are more clustered around the mean. From a correlation perspective, it was observed that the two variables were negatively associated and moved in opposing directions to one another. The study applied an Exponential Generalized Autoregressive Conditional Heteroskedasticity (EGARCH) model to assess the impact of foreign exchange fluctuations on stock market performance. The exchange rate was found to have a negative significant effect on stock market returns, albeit of low magnitude. This fit in with the overarching theory that adverse currency movements would impact the stock market performance. The study findings can be helpful to investors in understanding how exchange rate dynamics impact market performance and guide them in making decisions on investment strategy. It is recommended measures aimed at ensuring stability in the foreign exchange market should be employed so as to build up investor confidence and encourage improved market performance at the Nairobi Securities Exchange.

Subjects/Keywords: Foreign Exchange Fluctuations on equity market

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

APA (6^th Edition):

Sewe, K. O. (2016). The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange . (Thesis). University of Nairobi. Retrieved from http://hdl.handle.net/11295/99694

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

Chicago Manual of Style (16^th Edition):

Sewe, Kevin O. “The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange .” 2016. Thesis, University of Nairobi. Accessed December 14, 2019. http://hdl.handle.net/11295/99694.

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

MLA Handbook (7^th Edition):

Sewe, Kevin O. “The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange .” 2016. Web. 14 Dec 2019.

Vancouver:

Sewe KO. The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange . [Internet] [Thesis]. University of Nairobi; 2016. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/11295/99694.

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

Council of Science Editors:

Sewe KO. The effect of foreign exchange fluctuations on equity market performance of the Nairobi securities exchange . [Thesis]. University of Nairobi; 2016. Available from: http://hdl.handle.net/11295/99694

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

University of Pretoria

15. [No author]. Applications and portfolio theory in the South African agricultural derivatives market .

Degree: 2008, University of Pretoria

URL: http://upetd.up.ac.za/thesis/available/etd-05152008-142000/

► South African agriculture experienced rapid deregulation during the 1990s as the one channel marketing boards were dismantled. For the grains industry this meant the rapid… (more)

▼ South African agriculture experienced rapid deregulation during the 1990s as the one channel marketing boards were dismantled. For the grains industry this meant the rapid development of a derivatives market (SAFEX). Derivative markets are surely the most intriguing and complex financial markets with the most misunderstood and riskiest instruments of all financial markets. Their complexity also caused its fair share of problems within the South African scenario with the inception of SAFEX in 1996/97. Not only is this type of market complex but it also creates huge fluctuations in the portfolio value of a derivatives linked portfolio. It is precisely this type of fluctuations and exposure that can be controlled and managed to the preferred level of risk by the correct and responsible application of these instruments. The successful application of these instruments depends greatly on the fact that the underlying market should be an efficient market which will then in turn allow for cost effective pricing of these instruments and ultimately lead to successful product structuring. The South African agricultural derivatives market was tested for efficiency by using a co-integration analysis which proved market efficiency. Once market efficiency was established it allowed for the structuring of marketing portfolios which ultimately resulted in a rule of thumb marketing strategy for maize producers. The strategy required the maize producer to fix a price during planting period for delivery in July the following year. In order for the producer to benefit from any potential upside during the season between price fixing and delivery the producer should buy a call option with an expiry date of the month of March following planting. This will save him at least four months worth of time value on the option premium. This study also acknowledged the fact that the derivatives market in South Africa is still in its fledgling phase and realises the vast potential for risk reduction through radical innovation by creating and mixing the basic positions of derivatives. This study illustrates by way of examples a few approaches in structured products. In an attempt to achieve successful product development the study applied portfolio theory as a means to quantify risk by using mean return and portfolio variance parameters. It addressed the more obvious price risk situation which is faced by all grain producers by developing a rule of thumb marketing strategy for farmers. The more complex situation of emerging agriculture was also considered where the objective was to enable a small scale producer to benefit from the risk reduction potential of these instruments. At the same time it would also allow them to access production credit without a traditional balance sheet while allowing the financier to be ring fenced from the risk of price fluctuation on the clients profit profile. A more adventures approach was followed for the dairy industry by creating a proxy price for milk based on the maize price of SAFEX in an attempt to encourage an… Advisors/Committee Members: Prof J F Kirsten (advisor).

Subjects/Keywords: Derivatives market; Financial market; Fluctuations; UCTD

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

author], [. (2008). Applications and portfolio theory in the South African agricultural derivatives market . (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-05152008-142000/

Chicago Manual of Style (16^th Edition):

author], [No. “Applications and portfolio theory in the South African agricultural derivatives market .” 2008. Masters Thesis, University of Pretoria. Accessed December 14, 2019. http://upetd.up.ac.za/thesis/available/etd-05152008-142000/.

MLA Handbook (7^th Edition):

author], [No. “Applications and portfolio theory in the South African agricultural derivatives market .” 2008. Web. 14 Dec 2019.

Vancouver:

author] [. Applications and portfolio theory in the South African agricultural derivatives market . [Internet] [Masters thesis]. University of Pretoria; 2008. [cited 2019 Dec 14]. Available from: http://upetd.up.ac.za/thesis/available/etd-05152008-142000/.

Council of Science Editors:

author] [. Applications and portfolio theory in the South African agricultural derivatives market . [Masters Thesis]. University of Pretoria; 2008. Available from: http://upetd.up.ac.za/thesis/available/etd-05152008-142000/

EPFL

16. Heyman, Joris. A study of the spatio-temporal behaviour of bed load transport rate fluctuations.

Degree: 2014, EPFL

URL: http://infoscience.epfl.ch/record/202041

► This thesis addresses the problem of a statistical description of the transport of sediment as bed load. It highlights the role of fluctuations arising during… (more)

▼ This thesis addresses the problem of a statistical description of the transport of sediment as bed load. It highlights the role of fluctuations arising during the transport process, and their impact on macroscopic averages. The results presented here are based on four experimental studies. Two of them were published recently by Böhm et al. [2004] and Roseberry et al. [2012] while the other two were carried out during the thesis. In particular, two high speed cameras were used to automatically reconstruct particle trajectories over a window of approximately 1mlength, continuously over a few minutes. This constitutes, at the time of writing, one of the largest sets of experimental particle trajectory data available. Based on these experiments, two probabilistic models are proposed. The first one offers a macroscopic picture of the fluctuations of particle activity (concentration of moving particles). Based on a model recently proposed by Ancey et al. [2008], it allows for the accurate prediction of the fluctuations observed in the bed load flux. A new formula for the probability density function of the volume-averaged bed load flux is derived and compared to experimental data as well as to existing theory. By slightly modifying the original model, it was also possible to derive the probability density function of the inter-arrival time of particles. The latter shows an unusual bimodal shape due to the effect of collective entrainment. This phenomenon is referred to as the “separation of time scales” [Heyman et al., 2013]. Although providing an accurate picture of the macroscopic fluctuations arising in bed load transport, the first model does not gather information about the spatial behaviour of the bed load flux fluctuations. To remedy this, a new probabilistic model, able to locally describe the transport process, is proposed. This model lies in-between a kinetic description of the transport process and the macroscopic model proposed by Ancey et al. [2008]. In this regard, only the particle positions are treated as random variables, while particle velocities are assumed to be close to the Maxwellian equilibrium distribution. By a careful analysis of first and second moments, in both spatial and temporal dimensions, I prove the occurrence of large correlated structures that strongly perturb the average equilibrium, while not fundamentally modifying it. Moreover, I show that the validity of Taylor’s frozen flow hypothesis for bed load transport is severely called into question by the experimental data, proving the peculiar behaviour of those structures during transport by the mean fluid flow. Finally, a discussion about scales of fluctuations is provided. It follows from experimental results, as well as from theoretical predictions, that local fluctuations may play an important role in both an experimental setup and natural rivers. Indeed, the saturation and the correlation lengths are often so large that fluctuations may interact in a non-trivial way with the boundaries of the system, precluding the use of macroscopic… Advisors/Committee Members: Ancey, Christophe.

Subjects/Keywords: bed load; fluctuations; sediment transport; stochastic models

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

APA (6^th Edition):

Heyman, J. (2014). A study of the spatio-temporal behaviour of bed load transport rate fluctuations. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/202041

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

Chicago Manual of Style (16^th Edition):

Heyman, Joris. “A study of the spatio-temporal behaviour of bed load transport rate fluctuations.” 2014. Thesis, EPFL. Accessed December 14, 2019. http://infoscience.epfl.ch/record/202041.

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

MLA Handbook (7^th Edition):

Heyman, Joris. “A study of the spatio-temporal behaviour of bed load transport rate fluctuations.” 2014. Web. 14 Dec 2019.

Vancouver:

Heyman J. A study of the spatio-temporal behaviour of bed load transport rate fluctuations. [Internet] [Thesis]. EPFL; 2014. [cited 2019 Dec 14]. Available from: http://infoscience.epfl.ch/record/202041.

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

Council of Science Editors:

Heyman J. A study of the spatio-temporal behaviour of bed load transport rate fluctuations. [Thesis]. EPFL; 2014. Available from: http://infoscience.epfl.ch/record/202041

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

Hong Kong University of Science and Technology

17. Tsang, Kin Yau. Stable bandwidth allocation against fluctuations in complex networks.

Degree: 2016, Hong Kong University of Science and Technology

URL: https://doi.org/10.14711/thesis-b1627738 ; http://repository.ust.hk/ir/bitstream/1783.1-87078/1/th_redirect.html

► Fluctuations of resources in complex networks such as power grids are common and it may cause the current flows to exceed the capacity limit of… (more)

Subjects/Keywords: Electric power distribution; Mathematical models; Fluctuations (Physics)

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APA (6^th Edition):

Tsang, K. Y. (2016). Stable bandwidth allocation against fluctuations in complex networks. (Thesis). Hong Kong University of Science and Technology. Retrieved from https://doi.org/10.14711/thesis-b1627738 ; http://repository.ust.hk/ir/bitstream/1783.1-87078/1/th_redirect.html

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

Chicago Manual of Style (16^th Edition):

Tsang, Kin Yau. “Stable bandwidth allocation against fluctuations in complex networks.” 2016. Thesis, Hong Kong University of Science and Technology. Accessed December 14, 2019. https://doi.org/10.14711/thesis-b1627738 ; http://repository.ust.hk/ir/bitstream/1783.1-87078/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Tsang, Kin Yau. “Stable bandwidth allocation against fluctuations in complex networks.” 2016. Web. 14 Dec 2019.

Vancouver:

Tsang KY. Stable bandwidth allocation against fluctuations in complex networks. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2016. [cited 2019 Dec 14]. Available from: https://doi.org/10.14711/thesis-b1627738 ; http://repository.ust.hk/ir/bitstream/1783.1-87078/1/th_redirect.html.

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

Council of Science Editors:

Tsang KY. Stable bandwidth allocation against fluctuations in complex networks. [Thesis]. Hong Kong University of Science and Technology; 2016. Available from: https://doi.org/10.14711/thesis-b1627738 ; http://repository.ust.hk/ir/bitstream/1783.1-87078/1/th_redirect.html

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

Iowa State University

18. Vogts, Jacob Aaron. Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies.

Degree: 2018, Iowa State University

URL: https://lib.dr.iastate.edu/etd/16893

► This thesis presents the results of an analysis of the effect of changes in the mean volume fraction and local volume fraction have on the… (more)

Subjects/Keywords: Drag Fluctuations; Local Drag; Mean Drag

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

APA (6^th Edition):

Vogts, J. A. (2018). Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/16893

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

Chicago Manual of Style (16^th Edition):

Vogts, Jacob Aaron. “Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies.” 2018. Thesis, Iowa State University. Accessed December 14, 2019. https://lib.dr.iastate.edu/etd/16893.

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

MLA Handbook (7^th Edition):

Vogts, Jacob Aaron. “Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies.” 2018. Web. 14 Dec 2019.

Vancouver:

Vogts JA. Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies. [Internet] [Thesis]. Iowa State University; 2018. [cited 2019 Dec 14]. Available from: https://lib.dr.iastate.edu/etd/16893.

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

Council of Science Editors:

Vogts JA. Investigation of mean volume fraction fluctuations on the mean drag force acting on spherical particle assemblies. [Thesis]. Iowa State University; 2018. Available from: https://lib.dr.iastate.edu/etd/16893

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

19. Lindblom, Elin. Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen.

Degree: Social Sciences, 2014, Södertörn University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-24250

►

Mot bakgrund av de senaste decenniernas konjunktursvängningar i världsekonomin konstaterades det i Sverige att det fanns ett behov av att kunna möta dessa svängningar.… (more)

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Mot bakgrund av de senaste decenniernas konjunktursvängningar i världsekonomin konstaterades det i Sverige att det fanns ett behov av att kunna möta dessa svängningar. Detta resulterade i den lagändring av Kommunallagen och Lagen om kommunal redovisning som erbjöd kommuner möjligheten till att införa en resultatutjämningsreserv i redovisningen. Denna resultatutjämningsreserv utgör ett periodiseringsverktyg där medel kan reserveras i goda tider för att sedan utnyttjas i sämre. Lagändringen är frivillig att anamma och har skapat en viss flexibilitet i kommunernas redovisning. Då kommuner har olika förutsättningar kan detta leda till att motiven till ställningstagandet kring ett införande av en resultatutjämningsreserv skiljer sig mellan kommuner. Uppsatsens syfte är att undersöka motiven till varför de valda kommunerna väljer att införa eller inte väljer att införa en resultatutjämningsreserv i redovisningen. Genom detta ämnar uppsatsen klargöra om motiven skiljer sig beroende på ekonomiska och demografiska omständigheter. En dokumentstudie genomfördes med syftet att kartlägga alla Sveriges 290 kommuners beslut rörande en resultatutjämningsreserv. Därefter valdes 40 kommuner ut till en faktorstudie för att kartlägga ekonomiska och demografiska omständigheter hos kommunerna. I ett sista skede av empiriinsamlingen intervjuades 20 av dessa 40 kommuner för att erhålla förståelse för motiven till att införa eller att inte införa en resultatutjämningsreserv. Studien visar på att kommuner som infört en resultatutjämningsreserv har samma motiv till detta som lagstiftarens intention, att möta konjunktur- svängningar. De kommuner som inte infört en resultatutjämningsreserv uppger mer spridda motiv. Motivet till att inte införa en resultatutjämningsreserv uppges vara att den leder till en inlåsning av egna medel eller att kommunen anser det onödig då kommunen har egna sätt att hantera konjunktursvängningars inverkan på ekonomin. Kommuner med mindre bra ekonomi uppger att motivet till att inte införa en resultatutjämningsreserv är att man i första hand behöver konsolidera ekonomin innan en sådan reserv kan bli aktuellt. Utifrån denna studie går det inte att se att större kommuner generellt har infört en resultatutjämningsreserv, vilket talar emot studien som Falkman et al genomfört om att större kommuner i större utsträckning anammar nya redovisningsregler. Denna avvikelse från teorin kan förklaras av frivilligheten i lagstiftningen samt den ickeexisterande praxis och rekommendationer gällande en resultat- utjämningsreserv.

Due to the last decades’ fluctuations in the world economy, it was pointed out that municipalities in Sweden needed a way to handle these fluctuations. This resulted in a change in the law of municipalities which made it possible for municipalities to implement a regulatory reserve in the accounting. This regulatory reserve is an accrual tool where funds can be reserved in good times in order to be used in worse. This legislative change has brought flexibility in to the accounting of the…

Subjects/Keywords: Municipalities; regulatory reserve; fluctuations; Kommun; resultatutjämningsreserv; konjunkturer

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

APA (6^th Edition):

Lindblom, E. (2014). Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen. (Thesis). Södertörn University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-24250

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

Chicago Manual of Style (16^th Edition):

Lindblom, Elin. “Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen.” 2014. Thesis, Södertörn University. Accessed December 14, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-24250.

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

MLA Handbook (7^th Edition):

Lindblom, Elin. “Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen.” 2014. Web. 14 Dec 2019.

Vancouver:

Lindblom E. Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen. [Internet] [Thesis]. Södertörn University; 2014. [cited 2019 Dec 14]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-24250.

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

Council of Science Editors:

Lindblom E. Kommunal resultatutjämningsreserv : Motiven till att införa eller inte införa en konjunkturreserv i redovisningen. [Thesis]. Södertörn University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-24250

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

Heriot-Watt University

20. Santana, Ted Silva. Resonance fluorescence of self-assembled quantum dots.

Degree: PhD, 2016, Heriot-Watt University

URL: http://hdl.handle.net/10399/3178

► Resonance fluorescence from solid state devices have been motivated by the capability to obtain a bright source of antibunched and indistinguishable photons from a semiconductor… (more)

Subjects/Keywords: 621.3815; resonance fluorescence; quantum dot; spectral fluctuations

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APA (6^th Edition):

Santana, T. S. (2016). Resonance fluorescence of self-assembled quantum dots. (Doctoral Dissertation). Heriot-Watt University. Retrieved from http://hdl.handle.net/10399/3178

Chicago Manual of Style (16^th Edition):

Santana, Ted Silva. “Resonance fluorescence of self-assembled quantum dots.” 2016. Doctoral Dissertation, Heriot-Watt University. Accessed December 14, 2019. http://hdl.handle.net/10399/3178.

MLA Handbook (7^th Edition):

Santana, Ted Silva. “Resonance fluorescence of self-assembled quantum dots.” 2016. Web. 14 Dec 2019.

Vancouver:

Santana TS. Resonance fluorescence of self-assembled quantum dots. [Internet] [Doctoral dissertation]. Heriot-Watt University; 2016. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10399/3178.

Council of Science Editors:

Santana TS. Resonance fluorescence of self-assembled quantum dots. [Doctoral Dissertation]. Heriot-Watt University; 2016. Available from: http://hdl.handle.net/10399/3178

University of New South Wales

21. Chakka, Mohana Naga Sai Chand. Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts.

Degree: Civil & Environmental Engineering, 2019, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/61690

► Predictability is important in decision making in many fields, including transport. The fluctuations of time-varying and short-term traffic processes pose critical challenges for real-time traffic… (more)

▼ Predictability is important in decision making in many fields, including transport. The fluctuations of time-varying and short-term traffic processes pose critical challenges for real-time traffic predictions, which are the backbone of the intelligent transportation systems (ITS). The success of different prediction techniques depends on the structure of the phenomenon, in particular whether it is easily predictable or complex. Therefore, understanding the various aspects leading to high/low complexity in traffic time series data is critical in evaluating the performance of urban traffic systems.This thesis presents the application of the Hurst exponent metric from Fractal theory in quantifying fluctuations in different micro and macroscopic parameters of urban traffic. Data from three distinct sources and geographical locations are used for the analysis. i) Vehicle trajectory data collected every 0.5sec from an arterial road in India and a freeway in the USA are utilised to evaluate fluctuations in lateral movements and speeds of thousands of vehicles. The effect of the average lateral position and vehicle type on fluctuations is also examined.ii) Loop detector data collected every 30sec from monitor sites on an urban motorway in Australia are used to quantify fluctuations in speed and flow. The effect of the time of the day, weekend, proximity to ramps, and the presence of a horizontal curve, on fluctuations is explored using the analysis of variances. Further, latent class and random parameters Tobit models are estimated to predict the effect of the Hurst exponent (long-range dependence) of speed on crash rates at motorway sites.iii) Traffic count data collected every 5min at signalised intersections in Sydney, Australia are studied to understand the patterns of predictability. The effect of the day of the week, public holidays, special events, weather, etc. on predictability is discussed using a random effects linear regression model. This thesis is data-driven; the empirical results suggest the need to evaluate fluctuations in traffic time series data before using different prediction and simulation techniques. Furthermore, this thesis could lead to many applications of fractal analysis on highways and urban traffic. Advisors/Committee Members: Waller, S. Travis, Faculty of Engineering, UNSW, Dixit, Vinayak V., Faculty of Engineering, UNSW.

Subjects/Keywords: Traffic flow; Fluctuations; Fractal theory; Crashes; Predictability

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APA (6^th Edition):

Chakka, M. N. S. C. (2019). Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61690

Chicago Manual of Style (16^th Edition):

Chakka, Mohana Naga Sai Chand. “Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts.” 2019. Doctoral Dissertation, University of New South Wales. Accessed December 14, 2019. http://handle.unsw.edu.au/1959.4/61690.

MLA Handbook (7^th Edition):

Chakka, Mohana Naga Sai Chand. “Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts.” 2019. Web. 14 Dec 2019.

Vancouver:

Chakka MNSC. Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2019 Dec 14]. Available from: http://handle.unsw.edu.au/1959.4/61690.

Council of Science Editors:

Chakka MNSC. Evaluating Fluctuations in Urban Traffic Data and Modelling Their Impacts. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/61690

University of Notre Dame

22. Dhiraj D Pant. Essays on Aggregate Fluctuations in the Least Developed Countries</h1>.

Degree: PhD, Economics, 2012, University of Notre Dame

URL: https://curate.nd.edu/show/9593tt46q1k

► An important body of work has been devoted to understanding both the extent and the causes of the decrease in output volatility in industrialized… (more)

▼ An important body of work has been devoted to understanding both the extent and the causes of the decrease in output volatility in industrialized and middle-income countries since the mid-eighties. In this dissertation, I study the behavior of aggregate output fluctuations in the least developed countries, also referred to as the world’s poorest countries. The basic finding is that the output volatility has moderated. I then survey possible explanations responsible for such moderation. Chapter 1 establishes two empirical facts on output volatility - structural break and moderation. Looking at the sample of thirty-two countries between 1960 and 2007, I find that there has been a structural break in the volatility of output. Furthermore, examining volatility before and after the break shows that 78% of them experienced moderation during the late eighties. Chapter 2 answers the question of what might be the possible causes behind this moderation. In particular, I examine two compelling hypotheses that closely relate to these economies - commodity price volatility and trade liberalization. Results on commodity price fluctuations show no supporting evidence for moderation. However, trade liberalization seems to have played an important role. In particular, I look at the effect of openness on output volatility and find the relationship to be negative and significant. This chapter also looks at how trade costs have evolved with an increase in openness (trade/GDP) over the span of fifty years. Finally, chapter 3 develops a model to determine the impact of trade openness on the aggregate output volatility. In particular, I build a simple two-country, stochastic open-economy business cycle model within a complete market setting. The model incorporates trade costs on the imported good in the home country (poor) to proxy for openness. By varying trade costs, the model is able to explain qualitatively well the changes in the volatility of output. Advisors/Committee Members: Michael Pries, Committee Member, Nelson Mark, Committee Chair, Eric Sims, Committee Member.

Subjects/Keywords: Output volatility; least developed countries; fluctuations

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

APA (6^th Edition):

Pant, D. D. (2012). Essays on Aggregate Fluctuations in the Least Developed Countries</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/9593tt46q1k

Chicago Manual of Style (16^th Edition):

Pant, Dhiraj D. “Essays on Aggregate Fluctuations in the Least Developed Countries</h1>.” 2012. Doctoral Dissertation, University of Notre Dame. Accessed December 14, 2019. https://curate.nd.edu/show/9593tt46q1k.

MLA Handbook (7^th Edition):

Pant, Dhiraj D. “Essays on Aggregate Fluctuations in the Least Developed Countries</h1>.” 2012. Web. 14 Dec 2019.

Vancouver:

Pant DD. Essays on Aggregate Fluctuations in the Least Developed Countries</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2012. [cited 2019 Dec 14]. Available from: https://curate.nd.edu/show/9593tt46q1k.

Council of Science Editors:

Pant DD. Essays on Aggregate Fluctuations in the Least Developed Countries</h1>. [Doctoral Dissertation]. University of Notre Dame; 2012. Available from: https://curate.nd.edu/show/9593tt46q1k

University of Alberta

23. Hashemi, Seyed Abolreza. Velocity and concentration fluctuations in concentrated solid-liquid flows.

Degree: PhD, Department of Chemical and Materials Engineering, 2013, University of Alberta

URL: https://era.library.ualberta.ca/files/6h440s69w

► The aim of this research was to investigate experimentally the turbulent flow of concentrated slurries in horizontal pipelines and to improve the fundamental understanding of… (more)

▼ The aim of this research was to investigate experimentally the turbulent flow of concentrated slurries in horizontal pipelines and to improve the fundamental understanding of mechanism(s) that govern these. High speed Electrical Impedance Tomography (EIT) was combined with advanced signal processing techniques to develop a measurement procedure to obtain solids concentration distributions and turbulent intensity profiles in a highly concentrated solid-liquid mixture. Specific Energy Consumption (SEC), which is a measure of transport efficiency, was used to find the optimum operating condition for heterogeneous (settling) slurry flows. The effects of solids concentration, mixture velocity and particle diameter on SEC were determined using the equivalent-fluid and near-wall lift models for fine- and coarse-particle slurries, respectively. The analysis shows that the minimum SEC occurs at a solids concentration of approximately 30% by volume. Model predictions were compared with the results of numerous experimental studies. In spite of the utility of phenomenological models, such as the near-wall lift model, many fundamental questions in solid-liquid flows remain. Issues include the poor understanding of the mechanisms that govern these complex flows, and the lack of local parameters measured and available for model validation studies. Among the various parameters, solids and liquid concentration fluctuations and turbulent intensities are arguably the most important pieces of information that need to be measured. In horizontal slurry pipe flows, solids velocity and concentration fluctuations were measured for concentrated sand-water mixtures (20 - 35% solids by volume). Slurries of narrowly sized sand (d50 = 100 μm) were tested in a 52 mm (i.d.) pipe loop at different mixture velocities (2 - 5 m/s) that were significantly above the deposition velocity. The results showed that the magnitude of the local solids concentration fluctuations is greater near the pipe wall and increases as the mixture velocity increases. Additionally, the concentration fluctuations are greater near the pipe invert, particularly at lower mixture velocities and/or concentrations where the solids concentration profiles are asymmetric. Experiments were also carried out in a 10.16 cm (i.d.) solid-liquid fluidized bed using 2, 3 and 4 mm mono-sized spherical glass beads with water as the continuous phase. A reduced solids concentration in the central region of the bed, which is known to occur during the bubbly (aggregate) fluidization regime, was observed. This study provides further insight into the dynamic behaviour of liquid-solid fluidized beds through the measurement of local solids concentration fluctuations.

Subjects/Keywords: Solids concentration fluctuations; Solids velocity fluctuations; Solid-liquid flows; Electrical Impedance Tomography

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APA (6^th Edition):

Hashemi, S. A. (2013). Velocity and concentration fluctuations in concentrated solid-liquid flows. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/6h440s69w

Chicago Manual of Style (16^th Edition):

Hashemi, Seyed Abolreza. “Velocity and concentration fluctuations in concentrated solid-liquid flows.” 2013. Doctoral Dissertation, University of Alberta. Accessed December 14, 2019. https://era.library.ualberta.ca/files/6h440s69w.

MLA Handbook (7^th Edition):

Hashemi, Seyed Abolreza. “Velocity and concentration fluctuations in concentrated solid-liquid flows.” 2013. Web. 14 Dec 2019.

Vancouver:

Hashemi SA. Velocity and concentration fluctuations in concentrated solid-liquid flows. [Internet] [Doctoral dissertation]. University of Alberta; 2013. [cited 2019 Dec 14]. Available from: https://era.library.ualberta.ca/files/6h440s69w.

Council of Science Editors:

Hashemi SA. Velocity and concentration fluctuations in concentrated solid-liquid flows. [Doctoral Dissertation]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/6h440s69w

Université de Grenoble

24. Schenke, Christoph. Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap.

Degree: Docteur es, Physique, 2012, Université de Grenoble

URL: http://www.theses.fr/2012GRENY058

►

Cette thèse comprend une analyse d'un système de N bosons de masse m, à une dimension (1D). Vue des efforts expérimentaux récents et de la… (more)

▼

Cette thèse comprend une analyse d'un système de N bosons de masse m, à une dimension (1D). Vue des efforts expérimentaux récents et de la perspective d'étudier plusieurs effets quantiques intéressants, nous choisissons une géométrie circulaire avec une circonférence L. Un potentiel extérieur dépendant du temps nous permet d'introduire un mécanisme qui change l'état du moment angulaire des bosons. Ce potentiel est de la forme d'une fonction delta de Dirac qui se déplace le long de l'anneau à une vitesse v et la force de ce potentiel vaut U_0. Il peut être vu comme une barrière qui met les bosons en rotation. Les interactions entre les bosons sont des interactions de contact, décrites dans le modèle de Lieb et Liniger. Puisque le potentiel extérieur ne garde pas la symétrie de translation de L'Hamiltonien du système l'équation de Schrödinger n'est pas résoluble de manière exacte en utilisant un Ansatz de Bethe. Cependant, dans les limites des bosons libres et des bosons impénétrables de Tonks et Girardeau des méthodes alternatives existent pour trouver une solution exacte. Le but de cette thèse est de résoudre l'équation de Schrödinger dans ces cas limites. La solution nous permet d'accéder aux observables intéressantes concernant les propriétés superfluides des bosons libres et du gaz de Tonks. Nous effectuons une analyse du courant des particules, de ses fluctuations et de la force de traînée. Nous trouvons un comportement superfluide en-dessous d'une vitesse critique v_c=ħπ/(mL) de la barrière. Une oscillation du courant et la force de traînée est observée pour une vitesse de la barrière v=n*v_c, avec n un entier naturel. De plus, nous étudions la nature de l'état quantique du gaz de Tonks. Dans les analyses de la distribution des impulsions, de la fonction de Wigner et des images ``temps de vol'' pour une vitesse de la barrière v=n*v_c, on trouve que l'état du système est une superposition macroscopique de deux sphères de Fermi, l'une centrée autour de l'impulsion égale à zéro et l'autre autour de l'impulsion égale à 2q, avec q=mv/ħ. Cet état est un état fortement corrélé, non-classique car la fonction de Wigner atteint des valeurs négatives.

Recent experimental activities of boson trapping on a ring geometry open the way to explore a novel topology. We focus on a tight ring trap with strong transverse confinement leading to an effectively one-dimensional motion along its circumference. We consider a strongly interacting bose gas on the ring subjected to a localized barrier potential which is suddenly set into motion. The Bose-Fermi mapping allows to obtain an exact solution for the many-body wavefunction in the impenetrable-boson (Tonks-Girardeau) limit of infinitely strong interactions between the particles with arbitrary external potential, not treatable with the Bethe Ansatz. Using the time-dependent extension to BF mapping an exact solution for the dynamical evolution of the many-body wavefunction is obtained. The exact solution allows to calculate the particle current, the particle current fluctuations…

Advisors/Committee Members: Hekking, Frank W. J. (thesis director), Minguzzi, Anna (thesis director).

Subjects/Keywords: Basse dimensionnalité; Superfluidité; Fluctuations quantiques; Interactions fortes; Reduced dimensions; Superfluididity; Quantum fluctuations; Strong interactions

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APA (6^th Edition):

Schenke, C. (2012). Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2012GRENY058

Chicago Manual of Style (16^th Edition):

Schenke, Christoph. “Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap.” 2012. Doctoral Dissertation, Université de Grenoble. Accessed December 14, 2019. http://www.theses.fr/2012GRENY058.

MLA Handbook (7^th Edition):

Schenke, Christoph. “Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap.” 2012. Web. 14 Dec 2019.

Vancouver:

Schenke C. Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap. [Internet] [Doctoral dissertation]. Université de Grenoble; 2012. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2012GRENY058.

Council of Science Editors:

Schenke C. Bosons de Tonks et Girardeau dans un anneau à une dimension : Tonks Girardeau Bosons on a 1D ring trap. [Doctoral Dissertation]. Université de Grenoble; 2012. Available from: http://www.theses.fr/2012GRENY058

25. Ghosn, Sandra. Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities.

Degree: Docteur es, Sciences économiques, 2014, Paris 9

URL: http://www.theses.fr/2014PA090033

►

L’objectif de cette thèse est de mettre en avant le rôle de la psychologie dans les fluctuations de la production, de la redistribution et des… (more)

Subjects/Keywords: Psychologie; Croyances; Redistribution; Inégalités; Fluctuations; Effort; Cycles; Psychology; Beliefs; Redistribution; Inequalities; Fluctuations; Effort; Cycles; 339

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APA (6^th Edition):

Ghosn, S. (2014). Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities. (Doctoral Dissertation). Paris 9. Retrieved from http://www.theses.fr/2014PA090033

Chicago Manual of Style (16^th Edition):

Ghosn, Sandra. “Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities.” 2014. Doctoral Dissertation, Paris 9. Accessed December 14, 2019. http://www.theses.fr/2014PA090033.

MLA Handbook (7^th Edition):

Ghosn, Sandra. “Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities.” 2014. Web. 14 Dec 2019.

Vancouver:

Ghosn S. Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities. [Internet] [Doctoral dissertation]. Paris 9; 2014. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2014PA090033.

Council of Science Editors:

Ghosn S. Le rôle de la psychologie dans les dynamiques de la production, des inégalités et de la redistribution : The role of psychology in the dynamics of production, redistribution and inequalities. [Doctoral Dissertation]. Paris 9; 2014. Available from: http://www.theses.fr/2014PA090033

Université Montpellier II

26. Slyusarenko, Kostyantyn. Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques.

Degree: Docteur es, Milieux denses et matériaux, 2010, Université Montpellier II

URL: http://www.theses.fr/2010MON20066

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L'objectif de cette thèse est d'étudier la dynamique et le désordre spatial de l'orientation de l'axe facile, d'un cristal liquide nématique. La première partie du… (more)

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L'objectif de cette thèse est d'étudier la dynamique et le désordre spatial de l'orientation de l'axe facile, d'un cristal liquide nématique. La première partie du manuscrit est consacrée à l'étude de la dynamique de l'axe facile. Cette dynamique est généralement décrite au niveau moléculaire par deux procédés différents impliquant un mécanisme d'adsorption / désorption (AD) à la surface et la relaxation conformationelle d'un polymère. Nous avons élaboré une expérience et un modèle originaux capables de séparer l'influence de ces deux mécanismes microscopiques. Dans la deuxième partie, nous avons caractérisé statistiquement le désordre orientationnel de l'axe de facile pour différentes couches d'ancrage. Le désordre a des propriétés universelles, c'est à dire qu'il est le même sur toutes les surface analysées. Nous avons ensuite construit un modèle basé sur le « quenching » en surface des fluctuations nématique orientationnelles causé par le processus d'AD. Dans la dernière partie, nous avons mis en place une méthode avec une résolution spatiale et temporelle capable de capturer l'orientation moyenne de l'axe facile et sa distribution spatiale en fonction du temps. Nous montrons que le glissement de l'axe facile moyen se produit avec un changement relativement faible de son désordre spatial.

The aim of this PhD is to investigate the dynamics and the spatial disorder of the easy axis orientation, in the case of a nematic liquid crystal. The first part of the manuscript is devoted to the study of the easy axis dynamics. This dynamics is usually described at molecular level by two different processes involving adsorption/desorption (AD) at the surface and polymer conformal relaxations. We devise an original experiment and we build a general model able to separate the influence of these two microscopic mechanisms. In the second part, we statistically characterize the orientational disorder of the easy axis in a whole set of different anchoring layers. This disorder is found to have universal properties, i.e. it is the same on all the analyzed layers. We then build up a model based on the surface quenching of the nematic orientational fluctuations due to the AD-process. In the final part, we set up a method with spatial and temporal resolution capturing the average easy axis orientation and its spatial distribution as function of time. We show that the drift of the average easy axis occurs with a relatively small change of its spatial disorder.

Advisors/Committee Members: Nobili, Maurizio (thesis director), Reznikov, Yuriy (thesis director).

Subjects/Keywords: Cristaux liquides; Surface; Désordre; Glissement; Fluctuations; Liquid crystals; Surface; Disorder; Dynamics; Fluctuations

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

APA (6^th Edition):

Slyusarenko, K. (2010). Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2010MON20066

Chicago Manual of Style (16^th Edition):

Slyusarenko, Kostyantyn. “Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques.” 2010. Doctoral Dissertation, Université Montpellier II. Accessed December 14, 2019. http://www.theses.fr/2010MON20066.

MLA Handbook (7^th Edition):

Slyusarenko, Kostyantyn. “Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques.” 2010. Web. 14 Dec 2019.

Vancouver:

Slyusarenko K. Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques. [Internet] [Doctoral dissertation]. Université Montpellier II; 2010. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2010MON20066.

Council of Science Editors:

Slyusarenko K. Dynamics and disorder of nematic liquid crystals on aligning surfaces : Etude de la dynamique et du désordre de surface des cristaux liquides nématiques. [Doctoral Dissertation]. Université Montpellier II; 2010. Available from: http://www.theses.fr/2010MON20066

Université de Bordeaux I

27. Leroy, Céline Marie. Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity.

Degree: Docteur es, Physico-Chimie de la Matière Condensée, 2009, Université de Bordeaux I

URL: http://www.theses.fr/2009BOR13906

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La recherche scientifique contemporaine en matière de matériaux est largement orientée autour de l’optimisation et l’élaboration de nouveaux matériaux poly-fontionnels, multi-structurés et aux dimensions réduites.… (more)

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La recherche scientifique contemporaine en matière de matériaux est largement orientée autour de l’optimisation et l’élaboration de nouveaux matériaux poly-fontionnels, multi-structurés et aux dimensions réduites. De tels matériaux conduisent à s’intéresser à la problématique des comportements spécifiques résultant des différentes interfaces mises en jeu ; il peut s’agir d’interfaces physiques entre différents milieux (états différents, compositions chimiques différentes …) ou des interfaces entre différentes propriétés. Dans ce contexte, nous nous sommes intéressés aux corrélations pouvant exister entre les propriétés de luminescence et la réactivité de surface de films mésoporeux d’oxyde métalliques dopés avec des ions EuIII. Ces deux propriétés étant fortement dépendantes de la structure des matériaux, une grande partie de notre travail a été dédiée à la caractérisation de cette dernière. Un intérêt particulier a été porté à l’étude des conséquences de la présence des ions EuIII et à la localisation de ces derniers au sein des matrices étudiées. Finalement, il est apparu que la luminescence des ions EuIII au sein des films mésoporeux à base de TiO2 peut permettre de suivre les réactions redox se produisant au sein des pores, comme par exemple la photo-dégradation de composés organiques ou la photo-réduction de sels métalliques. La photo-réduction in situ permet la formation de réseaux périodiques de nanoparticules métalliques. Ces matériaux offrent donc de nombreuses perspectives d’applications dans des domaines aussi variés que les télécommunications optiques, la photonique, la photocatalyse…

Materials contemporary scientific research is largely devoted to the optimization and the elaboration of new poly-functional, multi-structured and size-reduced materials. Then, specific behaviors due to the different interfacial aspects of those materials – physical interfaces between different matter states, different chemical phases… or properties interfaces – have become a major issue requiring further investigations. In this context, our work deals with correlations that could be established between luminescence properties and surface reactivity of EuIII-doped metal oxide mesoporous thin films. As properties can be linked to materials structure, an important part of our work has been dedicated to structural characterization. EuIII ions incorporation specific effects and ions location within film walls have been particularly studied. Finally, it appeared that EuIII ions luminescence could provide a mean to follow redox reactions occurring within pores, such as organic compounds photo-degradation or metallic salts photo-reduction. In situ photo-reduction can lead to periodic arrays of metallic nanoparticles. La photo-réduction in situ permet la formation de réseaux périodiques de nanoparticules métalliques. Those materials can open up the way in many applications such as optical telecommunication, photonics, photocatalysis…

Advisors/Committee Members: Cardinal, Thierry (thesis director), Tréguer-Delapierre, Mona (thesis director).

Subjects/Keywords: Matériaux mésoporeux; Films minces; Fluctuations de luminescence; Photocatalyse; Mesoporous materials; Thin films; Luminescence fluctuations; Photocatalysis

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

APA (6^th Edition):

Leroy, C. M. (2009). Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2009BOR13906

Chicago Manual of Style (16^th Edition):

Leroy, Céline Marie. “Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity.” 2009. Doctoral Dissertation, Université de Bordeaux I. Accessed December 14, 2019. http://www.theses.fr/2009BOR13906.

MLA Handbook (7^th Edition):

Leroy, Céline Marie. “Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity.” 2009. Web. 14 Dec 2019.

Vancouver:

Leroy CM. Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2009. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2009BOR13906.

Council of Science Editors:

Leroy CM. Films mésoporeux de TiO2 ou ZrO2 dopés EuIII : de la localisation des ions EuIII à l’étude des corrélations entre les propriétés de luminescence et la réactivité de surface : EuIII doped TiO2 or ZrO2 mesoporous films : from the study of the EuIII ions location to the study of the correlations between luminescence and the surface reactivity. [Doctoral Dissertation]. Université de Bordeaux I; 2009. Available from: http://www.theses.fr/2009BOR13906

28. Février, Pierre. Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency.

Degree: Docteur es, Physique, 2017, Paris Saclay

URL: http://www.theses.fr/2017SACLS037

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A forte polarisation (V >1V), une jonction tunnel planaire peut émettre de la lumière dans le domaine optique à des fréquences f<eV/h ~ 10¹⁴Hz. Cette… (more)

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A forte polarisation (V >1V), une jonction tunnel planaire peut émettre de la lumière dans le domaine optique à des fréquences f<eV/h ~ 10¹⁴Hz. Cette émission résulte du rayonnement de plasmons-polariton de surface, générés par le bruit de grenaille dans la jonction. La densité spectrale de rayonnement dP/df est alors directement reliée à la densité spectrale des fluctuations du courant SII via une simple impédance de rayonnement: dP/df = R × SII. De la même manière, la densité spectrale de rayonnement du corps noir est reliée aux fluctuations thermiques du courant dans un conducteur ohmique via le théorème fluctuation-dissipation (TFD). Il semble alors naturel de décrire le rayonnement d'une jonction tunnel par la relation fluctuation-dissipation, dérivée par Scalapino et Rogovin [Annals of Physics 1974], généralisant le TFD aux conducteurs hors équilibre (V≠0). Nous avons étudié cette relation dans un régime où la jonction tunnel est fortement hors équilibre, lorsque eV ~1eV est de l'ordre de la hauteur de la barrière tunnel. La RFD est vérifiée à fréquence nulle (MHz), mais est violée de manière flagrante à fréquence finie (10¹⁴Hz). Nous attribuons cette violation à la non linéarité intrinsèque de la jonction. Nous dérivons une nouvelle expression pour la puissance émise, à partir de l'approche quantique de Landaueur-Büttiker du transport électronique. L'émission est alors interprétée en terme de recombinaison électron-trou dans les électrodes et rend compte d'une accumulation de charges dans la barrière. L'efficacité du couplage électron-photon est évaluée quantitativement via l'impédance de rayonnement de la jonction. Ce travail de thèse s'adresse à deux communautés, celle de la physique mésoscopique étudiant les mécanismes du transport électronique, et celle des opticiens voulant comprendre et optimiser l'émission de lumière dans ces systèmes.

In a strongly voltaged biased tunnel junction, optical photon emission occurs at frequencies below the threshold f<eV/h ~ 10¹⁴Hz, mediated by the shot-noise-generated surface plasmon-polaritons. The spectral power density dP/df depends only on the current fluctuation spectral density SII and a radiation impedance: dP/df = R × SII . This expression is analogous to the relation between the power spectral density of a black body and thermal current fluctuations in a ohmic conductor, via the fluctuation-dissipation theorem (FDT). Therefore, it seems natural that the optical power emitted by a tunnel junction be given by the fluctuation-dissipation relation (FDR) derived by Scalapino and Rogovin [Annals of Physics 1974], which extends the FDT to out-of-equilibrium conductors (V≠0). When the junction is far-from-equilibrium, i.e. when eV ~1eV is of the order of magnitude of the tunnel barrier height, our experiments show that the FDR holds at zero frequency (MHz), but breaks down at finite frequency (10¹⁴Hz). We attribute the discrepancy between the FDR and our measurements to the junction's intrinsic current-voltage non-linearity. We derive a new expression for emitted…

Advisors/Committee Members: Aprili, Marco (thesis director).

Subjects/Keywords: Jonction tunnel; Quantique; Photon; Optique; Bruit; Fluctuations; Tunnel junction; Quantum; Photon; Optics; Noise; Fluctuations

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

APA (6^th Edition):

Février, P. (2017). Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2017SACLS037

Chicago Manual of Style (16^th Edition):

Février, Pierre. “Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency.” 2017. Doctoral Dissertation, Paris Saclay. Accessed December 14, 2019. http://www.theses.fr/2017SACLS037.

MLA Handbook (7^th Edition):

Février, Pierre. “Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency.” 2017. Web. 14 Dec 2019.

Vancouver:

Février P. Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency. [Internet] [Doctoral dissertation]. Paris Saclay; 2017. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2017SACLS037.

Council of Science Editors:

Février P. Etude des fluctuations quantiques du courant aux fréquences optiques dans une jonction tunnel : Quantum current fluctuations in a tunnel junction at optical frequency. [Doctoral Dissertation]. Paris Saclay; 2017. Available from: http://www.theses.fr/2017SACLS037

Universidade Federal de Santa Maria

29. Carlos Alberto Vaz de Morais Junior. TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO.

Degree: 2006, Universidade Federal de Santa Maria

URL: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=420

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The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with… (more)

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The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic fields. The transverse field is a spin "flip" mechanism and inserts quantum fluctuations, which can lead the transition temperature Tj to quantum critical point (QCP). In this case, the phase transition from spin glass to paramagnetic phases occurs in T = o. On the other hand, charge fluctuations controlled by chemical potentiall-L show the existence of a tricritical point. The replica method with replica symmetry and static approximation are used to solve this problem. However, the replica symmetry solution shows some problems, like negative entropy in low temperatures. Thus, the stability conditions are derived to test the generated solution of this IDodel. The main purpose of this work is to study the competition between spin glass and paramagnetic phases with both quantum and charge fluctuations. After the stability conditions are derived, a detailed sight into the generated solution is shown under the form of diagrams phase. The stability conditions, however, show another applications in the present problem, once they can be used, for instance, in the tricritical point derivation.

o presente trabalho analisa o modelo vidro de spin Ising com um campo transverso, descrito no ensemble grande canônico, em uma formulação fermiônica, em que os operadores de spin são escritos como uma combinação bilinear de operadores de criação e destruição. Neste modelo, o campo transverso r é um mecanismo de "fiipagem" dos spins, que insere fiutuações de natureza quântica, que podem conduzir a temperatura de transição Tf ao ponto crítico quântico (PCQ). Neste caso, a transição de fase vidro de spin-paramagnética ocorre em T = O. Por outro lado, fiutuações de carga controladas pelo potencial químico mostram a existência de um ponto tricrítico. O método das réplicas com simetria de réplicas e a aproximação estática são usados para resolver este problema. Contudo, a solução com simetria de réplicas apresenta certos problemas na fase vidro de spin como, por exemplo, entropia negativa em baixas temperaturas. Desta forma, as condições de estabilidade são derivadas para testar a solução gerada pelo modelo. O objetivo geral é observar os efeitos combinados das fiutuações quânticas e de carga na competição entre as fase paramagnética e vidro de spin. A partir das condições de estabilidade, as soluções geradas pela simetria de réplicas são vistas detalhadamente na forma de diagramas de fase. As condições de estabilidade, todavia, mostram outras aplicações no presente problema, uma vez que podem, inclusive, ser utilizadas na derivação do ponto tricrítico.

Advisors/Committee Members: Sergio Garcia Magalhães, Rubem Erichsen Junior, Marcos André Carara.

Subjects/Keywords: flutuações de carga; flutuações quânticas; condições de estabilidade; ponto tricrítico; FISICA; charge fluctuations; quantum fluctuations; stability conditions; tricritical point

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

APA (6^th Edition):

Junior, C. A. V. d. M. (2006). TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO. (Thesis). Universidade Federal de Santa Maria. Retrieved from http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=420

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

Chicago Manual of Style (16^th Edition):

Junior, Carlos Alberto Vaz de Morais. “TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO.” 2006. Thesis, Universidade Federal de Santa Maria. Accessed December 14, 2019. http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=420.

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

MLA Handbook (7^th Edition):

Junior, Carlos Alberto Vaz de Morais. “TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO.” 2006. Web. 14 Dec 2019.

Vancouver:

Junior CAVdM. TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO. [Internet] [Thesis]. Universidade Federal de Santa Maria; 2006. [cited 2019 Dec 14]. Available from: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=420.

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

Council of Science Editors:

Junior CAVdM. TRANSIÇÕES DE PRIMEIRA ORDEM NO MODELO VIDRO DE SPIN ISING FERMIÔNICO EM UM CAMPO TRANSVERSO. [Thesis]. Universidade Federal de Santa Maria; 2006. Available from: http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=420

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

Université de Lorraine

30. Li, Da. Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur.

Degree: Docteur es, Physique, 2016, Université de Lorraine

URL: http://www.theses.fr/2016LORR0198

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Élasticité, viscoélasticité et transition vitreuse de liquides vitrifiants et de solides modèles sont étudiés par des simulations moléculaires à l'équilibre en utilisant le formalisme de… (more)

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Élasticité, viscoélasticité et transition vitreuse de liquides vitrifiants et de solides modèles sont étudiés par des simulations moléculaires à l'équilibre en utilisant le formalisme de fluctuation de contraintes. Les systèmes modèles étudiés sont composés de systèmes de Lennard-Jones à deux et trois dimensions, un mélange binaire de Lennard-Jones (LJ) des particules constituant la version 2d du modèle bien connu de Kob-Anderson (modèle KA2d), un mélange binaire AB13 de particules répulsives et un mélange ternaire de sphères dures. Nous étudions principalement l'effet de la température T sur les propriétés mécaniques des systèmes, en particulier les transitions de phase telles que la cristallisation ou la transition vitreuse. Les résultats sont présentés en deux parties, à savoir les propriétés statiques et les propriétés dépendant du temps. Les propriétés statiques que nous avons étudiées sont essentiellement le module de cisaillement G et le module de compression K. Utilisation des simulations de dynamique moléculaire proposées par le code LAMMPS, nous avons caractérisé G et K du modèle KA2d vitrifiant, et comparé les résultats avec un système de LJ2d monodisperse. Alors que ce dernier représente un saut significatif en G à la cristallisation, le système KA2d affiche un comportement de type « corne » continu à la transition vitreuse Tg, suivant la loi G (T) ~ (1-T/Tg)^a avec a = 0,6, confirmant qualitativement les résultats des simulations sur le système KA3d en 2013, mais en contradiction avec les prédictions basées sur la théorie de couplage de mode. Nous avons également comparé les constantes élastiques d'un cristal LJ cfc avec ceux d'un solide plus complexe, la structure AB13. Cette étude montre que, bien que la contribution non-affine disparaisse à la température nulle pour la structure cfc, ce n'est pas le cas pour la structure AB13. Cette constatation indique que nous ne pouvons pas utiliser systématiquement l'approximation de l'élasticité affine à T = 0 pour les cristaux à plusieurs composants. Dans la partie consacrée aux propriétés dépendant du temps, nous avons étudié plusieurs aspects et fonctions. Tout d'abord, nous avons exploré la dépendance du temps d'échantillonnage de nos résultats statiques, et montré que cette influence est forte pour les fluctuations de contrainte. Deuxièmement, la dynamique d'équilibre est étudiée par le biais de l'autocorrélation des contraintes de cisaillement et déplacement quadratique moyen de la contrainte, ainsi que la relation entre ces deux fonctions temporelles. L'objet principal, cependant, est le module de relaxation de la contrainte de cisaillement G(t) et les modules dynamique associée G'(w) et G'(w), avec w la fréquence. Ces fonctions caractérisent la viscoélasticité de nos systèmes. En utilisant une formule proposée récemment (Wittmer et al, Phys. Rev. E 2016), nous avons pu déterminer ces fonctions avec précision et étudier leur comportement pour nos systèmes en états liquide, cristallin et vitreux

Elasticity, viscoelasticity and glass transitions of…

Advisors/Committee Members: Xu, Hong (thesis director).

Subjects/Keywords: Simulation par ordinateur; Fluctuations des contraintes; Élasticité; Transition vitreuse; Viscoélasticité; Computer simulation; Stress fluctuations; Elasticity; Glass transition; Viscoelasticity; 530.424; 530.414

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

APA (6^th Edition):

Li, D. (2016). Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2016LORR0198

Chicago Manual of Style (16^th Edition):

Li, Da. “Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur.” 2016. Doctoral Dissertation, Université de Lorraine. Accessed December 14, 2019. http://www.theses.fr/2016LORR0198.

MLA Handbook (7^th Edition):

Li, Da. “Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur.” 2016. Web. 14 Dec 2019.

Vancouver:

Li D. Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur. [Internet] [Doctoral dissertation]. Université de Lorraine; 2016. [cited 2019 Dec 14]. Available from: http://www.theses.fr/2016LORR0198.

Council of Science Editors:

Li D. Elasticity, viscoelasticity, and glass transition of model systems by computer simulation : Élasticité, viscoélasticité et la transition vitreuse de systèmes modèles par simulation sur ordinateur. [Doctoral Dissertation]. Université de Lorraine; 2016. Available from: http://www.theses.fr/2016LORR0198

Open Access Theses and Dissertations