Thèses sur le sujet « Optical physical characterisation »
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Nish, Adrian. « Studies on optical characterisation of carbon nanotube suspensions ». Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:1ecd4f04-0178-4d8b-bf3a-cd6f8d744b92.
Texte intégralMcBride, Gillian M. « Physical and optical characterisation of carbon-silicon layers produced by rapid thermal chemical vapour deposition ». Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286865.
Texte intégralKloser, Rudolf J. « Seabed biotope characterisation based on acoustic sensing ». Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/524.
Texte intégralKloser, Rudolf J. « Seabed biotope characterisation based on acoustic sensing ». Curtin University of Technology, Faculty of Science and Engineering, Department of Imaging and Applied Physics, 2007. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18566.
Texte intégralThese ecological terrain types of soft-smooth, soft-rough, hard-smooth and hard-rough were chosen as they were the most relevant to the biota in their ability to attach on or burrow into the seabed. A seabed scattering model supported this empirical relationship and the overall shape of backscatter to incidence angle relationship for soft and hard seabed types. The correlation between acoustic data (backscatter mean and standard deviation) and the visual and physical samples was most consistent between soft-smooth and hard-rough terrain types for a large range of incidence angles (16o to 70o). Using phenomenological backscatter features segmented into 10 common incidence angle bins from -70o to 70o the length resolution of the data decreased to 0.55 times depth. The decreased resolution was offset by improved near normal incidence (0o to 30o) seabed type discrimination with cross validation error reducing from 32% to 4%. A significant relationship was also established between the acoustic data and the dominant functional groups of fauna. Faunal functional groups were based on the ecological function, feeding mode and substrate preference, with 8 out of the 10 groups predicted with 70% correctness by the four acoustically derived ecological terrain types. Restricting the terrain classification to simple soft and hard using the acoustic backscatter data improved the prediction of three faunal functional groups to greater than 80%. Combining the acoustic bathymetry and backscatter data an example region, Everard Canyon, was interpreted at a range of spatial scales and the ability to predict the preferred habitat of a stalked crinoid demonstrated.
Seabed terrain of soft and hard was predicted from the acoustic backscatter data referenced to a common seabed incidence angle of 40o. This method of analysis was selected due to its combined properties of high spatial resolution, consistent between terrain discrimination at the widest range of incidence angles and consistent data quality checking at varying ranges. Based in part on the research reported in this thesis a mid-depth Simrad EM300 multibeam sonar was purchased for use in Australian waters. A sampling strategy is outlined to map all offshore waters with priority within the 100 m to 1500 m depths.
Mukherjee, Kalparupa. « Investigation into trapping mechanisms and impact on performances and reliability of GaN HEMTs through physical simulation and electro-optical characterization ». Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0401/document.
Texte intégralGallium Nitride has emerged as a terrific contender to lead the future of the semiconductor industry beyond the performance limits of silicon.The immense potential of the AlGaN/GaN HEMT device is derived from the high density, high mobility electron gas formed at its hetero-structure. However, frequent subjection to high electric field, temperature and stress conditions makes the device vulnerable to reliability issues that restrict its efficiency and life time. A dominant contributor to several parasitic and reliability issues are traps present within the semiconductor structure which restrict the channel density and aggravate the device static and dynamic response. As the GaN industry addresses an increasing demand for superior devices, reliability analysis is of critical importance. There is a necessity to enable advancements in trap inhibition which would allow the realization of stronger, efficient devices.The motivation of this work is to recognize distinct ways in which various traps affect the performance and reliability metrics of GaN 0.25 µm HEMTs through a study of devices of the GH-25 process optimized for high power applications up to 20 GHz. The investigation employs physical TCAD simulations to provide insight and perspective to electrical and optical characterizations. Detailed analysis into independent and interrelated effects is performed to identify the relative impact of traps in circumstances presenting notable deviations from the ideal device response.The methodology to develop a representative TCAD model derived closely from internal physics is described with special focus on the sensitive gate leakage characteristic which reflects the influence of fundamental physical processes as well as parasitic effects commonly encountered in GaN HEMTs. Targeted simulations provide a pivotal link between the observation of a reliability issue and its underlying origin in trapping phenomena. Establishing associations between the spatial location of traps and the degradations they could trigger is an important objective of this thesis.Several simulation strategies that explore trapping behavior in various steady state and transient environments are discussed which allow detailed perception into the manner and extent to which trap attributes affect operational considerations. Approaches to distinguish disparate trap interactions are also described. The central case study in this thesis is an abstruse parasitic leakage phenomenon, identified in the GH 25 process as a consequence of aging stress. Referred to as the “belly shape”, it presents an interesting example of how the developed strategies can be applied to discern the causality, impact and evolution of the responsible traps. In order to take a deeper look into trapping modes, further aging and LASER characterizations are performed to alter the general occupational dynamics and observe the modulation of trap control over device response
RADIS, MICHELA. « Influence of material optical characteristics on vision and fruition of Cultural Heritage ». Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2687256.
Texte intégralMorris, Iestyn L. « Optical characterisation of semiconductors ». Thesis, Aberystwyth University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386969.
Texte intégralFitzmaurice, Anthony J. « Characterisation of nonlinear optical materials ». Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240597.
Texte intégralFermann, Martin. « Characterisation techniques for special optical fibres ». Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/404728/.
Texte intégralHillman, Christopher Wyndham John. « Scanning near-field optical microscope characterisation of microstructured optical fibre devices ». Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15484/.
Texte intégralXu, Jiansheng. « Characterisation and magneto-optical enhancement of thin film TbFeCo ». Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317538.
Texte intégralAcreman, Andrew. « Gold nanoparticle liquid crystal composites : synthesis, characterisation and optical nonlinearities ». Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/379319/.
Texte intégralJefferies, G. « The optical characterisation of nonlinear Langmuir-Blodgett film forming materials ». Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282440.
Texte intégralLochran, Stephen. « An optical, electro optic and thermal characterisation of various organic crystals ». Thesis, University of Strathclyde, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249852.
Texte intégralRees, Peter. « Characterisation of the waveguide dependence of optical mode loss in semiconductor lasers ». Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/108204/.
Texte intégralRoelens, Michaël Alberic Freddy. « Precise intensity and phase characterisation of optical telecommunication signals ». Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/42380/.
Texte intégralGordon, Neil Andrew. « Characterisation and control of coupled optical springs for future gravitational wave detectors ». Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6532/.
Texte intégralFinnan, Craig James. « The growth and characterisation of crystalline photoreactive materials for optical limiting applications ». Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288603.
Texte intégralAndersson, Kent. « Preparation and Characterisation of Sputtered Titanium- and Zirconium Nitride Optical Films ». Licentiate thesis, Solid State Physics Group, Department of Technology, Uppsala University, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-4530.
Texte intégralAesa, Abdulsattar Ahmad. « Characterisation of laser processed bio-compatible materials and the realisation of electro optical diffraction gratings ». Thesis, University of Hull, 2018. http://hydra.hull.ac.uk/resources/hull:16591.
Texte intégralGill, Devinder Singh. « Fabrication and characterisation of thin film optical waveguides by pulsed laser deposition ». Thesis, University of Southampton, 1996. https://eprints.soton.ac.uk/398737/.
Texte intégralSteer, Brian. « Selective characterisation of engineered nanoparticles in aerosols using nucleation and optical techniques ». Thesis, University of Kent, 2014. https://kar.kent.ac.uk/48699/.
Texte intégralMcCoy, Anoma Dayawansa. « Intensity noise suppression using a semiconductor optical amplifier : characterisations and applications ». Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/65501/.
Texte intégralSteer, Matthew John. « Optical and structural characterisation of III-V semiconductor qauntum wire and quantum dot structures ». Thesis, University of Sheffield, 1998. http://etheses.whiterose.ac.uk/3458/.
Texte intégralGregory, Tiffany Jane. « Optical characterisation and Zeeman studies of dilute magnetic single layer and multiple quantum well structures ». Thesis, University of Hull, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305914.
Texte intégralVienne, Guillaume. « Fabrication and characterisation of ytterbium:erbium codoped phosphosilicate fibres for optical amplifiers and lasers ». Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394566/.
Texte intégralWilkie, Stuart. « The preparation and optical characterisation of novel organic crystals with applications in non linear devices ». Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248563.
Texte intégralReich, Daniel Maximillian [Verfasser]. « Efficient Characterisation and Optimal Control of Open Quantum Systems - Mathematical Foundations and Physical Applications / Daniel Maximillian Reich ». Kassel : Universitätsbibliothek Kassel, 2015. http://d-nb.info/1073888851/34.
Texte intégralZachmann, Nils. « Characterisation of a Gas Modulation Refractometer for Detection of Gases at 1550 nm ». Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148557.
Texte intégralMang, Matthias M. « Interferometric spatio-temporal characterisation of ultrashort light pulses ». Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:163c5374-1466-4c4d-a0f5-c4e66b27e2ac.
Texte intégralSenior, Roger J. « Microwave Frequency Characterisation of Squeezed Light From an Optical Parametric Oscillator ». Thesis, 2006. http://hdl.handle.net/1885/44519.
Texte intégralDragomir, Nicoleta. « Microscopic characterisation of photonic devices ». Thesis, 2004. https://vuir.vu.edu.au/15522/.
Texte intégralKouskousis, Betty. « Microscopic characterisation of fibre Bragg gratings ». Thesis, 2009. https://vuir.vu.edu.au/15498/.
Texte intégral(8407140), Saadia T. Chaudhry. « CHAIN-LENGTH PROPERTIES OF CONJUGATED SYSTEMS : STRUCTURE, CONFORMATION, AND REDOX CHEMISTRY ». Thesis, 2021.
Trouver le texte intégralPetreski, Bill Petar. « Characterisation of optical fibre amplifiers : amplifiers for the 632.8 nm He-Ne wavelength in praseodymium-doped ZBLAN ». Thesis, 1997. https://vuir.vu.edu.au/15750/.
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