Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 488 for “"Polarisation"”.
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Integrated polarisation rotators
… ability to control and manipulate the state of polarisation of optical signals is becoming an increasingly desirable feature in numerous applications including integrated optical circuits, semiconductor optical amplifiers (SOAs) and optical communication systems. This thesis introduces the …
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Scene Segmentation Using Polarisation Information
… dielectric surface. Hence, variations in the polarisation properties of reflected and scattered light must indicate a change in properties of the reflecting surface. Assuming internal changes in refractive index can be neglected, any substantial change in the polarisation of light is thus …
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Understanding and Measuring Affective Polarisation in Mass Publics
… the concept and phenomenon of affective polarisation, which commonly refers to the dislike between individuals of different political camps. This thesis is guided by a methodological approach focused on the subjectively experiencing individual as analytical starting point for …
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A Bayesian Network Model of Political Belief Polarisation
… establishing the need to explain US mass belief polarisation, and suggest that the dominant existing theory – identity-motivated reasoning – has important limitations. I then explain how Bayesian agents can polarise in response to common evidence and review existing models of Bayesian …
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Single-molecule orientation estimation using a polarisation camera
… method - named POLCAM - is based on the use of a polarisation camera. Current methods for single-molecule orientation estimation require optical setups and algorithms that can be prohibitively slow and complex, limiting the widespread adoption of these methods for biological applications. In this …
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Computer simulation and theoretical prediction of thermally induced polarisation
… we study the phenomenon of thermally induced polarisation using a combination of theory and computer simulation. Molecules of sufficiently low symmetry exhibit thermo-molecular orientation when subjected to a temperature gradient, leading to considerable electrostatic fields in polar liquids. …
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Chaotic behavior and energy polarisation in flatband lattice models
Flatbands (FBs) in lattice systems correspond to dispersionless energy bands cre- ated through what is called destructive interference, a phenomenon caused by the existence of lattice symmetries, resulting in compactly localised wave functions to just a few lattice sites. The existence of FBs in …
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Investigating on elastic and inelastic nuclear scattering and polarisation
… between elastic and inelastic cross sections and polarisations are derived. The resulting phase rules are discussed. A modification of the Austern-Blair theory makes it possible to describe angular correlation measurements. The theory is compared with optical model and distorted wave Born …
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From Polarisation to Pluralism: An Action Research Study at Artisan
In an era of increasing division and polarization, this study explored how members of a local faith community, Artisan Church, can engage more effectively in difficult conversations. Using engaged action research––including a World Café and interviews––the study examined current engagement …
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Coherence Effects and Spin Polarisation of Electrons in Electromagnetic Fields
The collision of relativistic electrons with a counter propagating laser pulse can potentially generate short pulses of harmonics in the X-ray range, capable of tracking molecular, atomic and sub-atomic dynamics. Also, the creation of relativistic spin polarised electron beams is essential for …
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How TCR signal strength controls CTL polarisation for target killing
… attack are the initial conjugation followed by polarisation and docking of the centrosome to the junction of the two cells, the immune synapse (IS). This focuses secretion of the cytolytic components, perforin and granzyme, from modified lysosomes to kill the target cell. My PhD has utilised …
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Investigating the control of epithelial polarisation in human kidney organoids
Polarised epithelial tubes make up the bulk of the functional domains of adult organs, and failures in either the development or maintenance of these structures is the basis of many adult pathologies, such as polycystic kidney disease. One of the key mechanisms of tube formation during development …
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Cosmology with Planck: an all-sky temperature and polarisation analysis
… in 2009, observed the sky in temperature and polarisation, and released the nominal mission temperature data to the public in 2013. Planck has shed new light on CMB polarisation anisotropies and the polarisation signal from our own galaxy, and knowledge of the galactic emission forms a central …
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Race, class and spatial polarisation in the greater Cape Town
This paper investigates evidence of a possible spatial mismatch in the Cape Town metropolitan labour market that could contribute towards explaining why low-skilled workers' unemployment rates are significantly higher in the south-east townships. Pre- 1994 apartheid laws had a marked impact on …
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Differential polarisation studies of the deffuse interstellar band and Be stars
A microcomputer-controlled polarisation analyser has been designed and built at the Dominion Astrophysical Observatory specifically for the 1.83-m telescope. It is mounted before the Cassegrain spectrograph entrance, and is capable of providing spectropolarime-try at the full (--, 0.15 A) …
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La polarisation cognitive chez l'anorexique selon une philosophie existentielle.
… J'appelle ce mode d'apprehension du monde "polarisation cognitive". L'expression designe une incapacite et un refus de s'arreter ou de tracer des limites. Au fond, l'anorexique trace des limites absolues et surtout les limites de son corps. Son monde est parfaitement delimite et souvent elle …
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The Impact of Data Presentation Practices on Perceptions of Political Polarisation
… acknowledging the presence of some degree of polarisation – have deemed it fair to question whether citizens are as divided as they believe themselves to be. “False polarisation” is a phenomenon wherein true levels of polarisation are consistently overestimated by political partisans, leading …
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