Chan Po Shan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 79). / Text in English; abstracts in English and Chinese. / Chan Po Shan. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Application of Optical Waveguides --- p.1 / Chapter 1.2 --- Planar Waveguide Characterizations --- p.2 / Chapter 1.3 --- Silicon-On-Insulator Rib Waveguides --- p.3 / Chapter 1.4 --- Polarization compensation schemes --- p.4 / Chapter 1.5 --- Objectives --- p.6 / Chapter 2 --- Silicon-On-Insuiator Rib Waveguides --- p.9 / Chapter 2.1 --- Properties of Silicon Waveguides --- p.9 / Chapter 2.2 --- Single Mode Rib Waveguides Simulations --- p.11 / Chapter 2.3 --- Special design optimisations --- p.14 / Chapter 2.4 --- Fabrications and Results --- p.16 / Chapter 3 --- Polarization Characteristics of SOI Rib Waveguides --- p.20 / Chapter 3.1 --- Properties of silicon and effect of rib structure --- p.20 / Chapter 3.2 --- Polarization affected by Form Birefringence --- p.21 / Chapter 3.3 --- Case Study: Arrayed Waveguide Grating --- p.23 / Chapter 3.4 --- Possibility of polarization Compensation in planar waveguides --- p.26 / Chapter 4 --- Fixed Polarization Compensation Techniques --- p.30 / Chapter 4.1 --- Theoretical analysis of slant rib waveguides on polarization --- p.30 / Chapter 4.2 --- Focused Ion Beam Trimming of SOI waveguides --- p.31 / Chapter 4.3 --- Possible applications --- p.36 / Chapter 5 --- Tuneable Polarization Compensation Techniques --- p.41 / Chapter 5.1 --- stress on rib waveguide for polarization compensation --- p.41 / Chapter 5.2 --- Magnetostriction and Magnetostrictive Materials --- p.42 / Chapter 5.3 --- Sputtering of soft magnetic layer on SOI rib waveguides --- p.46 / Chapter 5.4 --- Test results and Analysis --- p.47 / Chapter 6 --- Advanced SOI Devices --- p.55 / Chapter 6.1 --- Unique planar optoelectronics devices --- p.55 / Chapter 6.2 --- Simulation and Fabrications --- p.57 / Chapter 6.3 --- Test Results and Discussion --- p.58 / Chapter 7 --- Conclusion --- p.62 / Chapter 7.1 --- Summary --- p.62 / Chapter 7.2 --- Future work --- p.63 / Appendices / Chapter A1 --- Effective Index Method --- p.66 / Chapter A2 --- Beam Propagation Method --- p.70 / Chapter A3 --- SOI Rib Waveguide Fabrication --- p.72 / Chapter A4 --- Focused Ion Beam --- p.74 / Chapter A5 --- Polarization Optics --- p.76 / List of Publications --- p.79

Most of the present time outdoor lighting investments seem to be focused on road and automotive traffic facilities or oriented toward safety, security and efficiency.  We can identify this in many of the world cities, as a globally spread common practice, where lighting is still highly perceived as a pure matter of quantities’ distribution.  Considering the tendency for the Human being to become an Urban-being, the future of human quality of life will, most probably, depend on the fortune of so called sustainable cities.  By lighting design, and promoting the return of the city lights to the Human scale, is argued that the Urban Planning approach may not correspond best to the person viewpoint, due to scale.  Will be explored, this way, by positioning the perspective at human eye level and not zenith bird-view, the traditional perspective over the city, where from not a soul ever experiences urbanity.  The method definition will be based mostly on observations and analysis of the Light and Lighting transitions taking place in cities, experienced by its inhabitants, from daytime to night time. / <p>QC 20170505</p>

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This work explores how colour and light can be used as the prime design materials. They are investigated in unison in relation to spatiality. Colour is a way for us to understand and identify what we see, it is primary for how we interpret our surroundings. The aim is to explore colour, light and reflections, by the means of printing and dyeing of translucent materials, as an attempt to challenge the visual perception of the spectator and the experience of how spatiality is perceived. The project investigates how the boundaries of a textile can be questioned, for example where does a pattern begin and end? Does it only belong to the textile or can it transcend to it’s surroundings? The investigational process is experimental and explores combinations of colour and light in translucent materials, coloured through the techniques of heat transfer printing and dyeing. Swatches made are analysed in relation to each other and to light, with a focus on their visual performance. The final design examples discusses the idea of how textile, light and colour can be used to create, define and illuminate spatiality.

This Diploma Thesis deals with the topic of the light and the soul in Charles Baudelaire and Otokar Březina in general. Then it concentrates on the particular motifs of the light and the soul and their metaphors. The main point of the Thesis is the poetic texts of both of the writers. The method used in this part is the literary and aesthetic analysis of the texts. Respect to the fact that it is focused on the comparative research, the following method used is the method of comparison which includes the charts with the frequency of the keywords in both of the authors and the enumerations which illustrate the issue of the present chapter. The aim of the Diploma Thesis is not only the comparison in the form and the interpretation but especially the determination of the similarities and the differences of the two poetic types within the framework of the present theme and the literary and historical context. Keywords Charles Baudelaire, Otokar Březina, metaphor, light, soul

Este ensaio objetiva refletir sobre minha série fotográfica Chiaroscuro, na qual trabalho constrastes entre luz e sombra e as consequentes representações de vazio e memória. Para tanto, elejo os teóricos da antropologia da imagem Jacques Rancière, Georges Didi-Huberman, Victor Stoichita e Hans Belting como meus interlocutores. Uma vez que um dos propósitos deste trabalho abrange observar possíveis inter-relações entre a série e alguns artistas contemporâneos, estabeleço reflexões acerca da produção fotográfica de Candida Höfer, Abelardo Morell e Hiroshi Sugimoto. O percurso em Chiaroscuro, bem como o estudo de elementos de composição da imagem, como o referente, o duplo, a luz e o tempo, auxiliaram-me a uma melhor compreensão do papel da fotografia em minha produção artística. Além disso, a representação da memória a partir do vazio, presente nas imagens da série, atesta a importância de se pensar a linguagem fotográfica em paralelo à pintura, à cultura, à mitologia e a outras linguagens que configuram a arte contemporânea. / This essay aims to reflect on my photographic series Chiaroscuro, in which I deal with contrasts between light and shadow and the consequent representation of emptiness and memory. For this purpose I elect the scholars from anthropology of the image Jacques Rancière, Georges Didi-Huberman, Victor Stoichita and Hans Belting as my interlocutors. As one of the purposes of this work covers to observe possible interrelations between my series and some contemporary artists, I establish reflections about the photography of Candida Höfer, Abelardo Morell and Hiroshi Sugimoto. The course in Chiaroscuro, and the study of elements of image composition, such as the referent, the double, the light and time, helped me to improve my understanding of photography role in my artistic production. In addition, the representation of memory out of emptiness, in this series of images shows the importance of thinking about the photographic language in parallel to painting, culture, mythology and other languages that shape contemporary art.

Multicellular development in fungi is fundamentally different from that of animals or plants. In filamentous fungi, multicellular structures are formed by aggregation and adhesion of hyphae, followed by septation and specialisation of hyphal compartments within the aggregate. The perithecium, a flask-shaped sexual fruitbody produced by both Neurospora crassa and Sordaria macrospora, provides a model system in which to study fungal multicellular development. This study presents a detailed description of the morphological stages of perithecial morphogenesis in N. crassa and S. macrospora and its early stages, the ascogonial and protoperithecial stages, using a range of microscopical techniques. Details of the development of several mutants impaired in perithecial development are described, including: gene-deletion mutants of all nine mitogen-activated protein (MAP) kinases conserved in N. crassa; and three mutants pro22, pro40 and pro41 of S. macrospora, and their corresponding gene-deletions in N. crassa. The results confirm that all three MAP kinase cascades are required for sexual development. However, only the pheromone response and cell-wall integrity MAP kinase pathways, but not the osmoregulatory MAP kinase pathway, are essential for hyphal cell fusion. Evidence of cell fusion-related processes, regulated through MAP kinase signalling, have been identified as novel features important for the construction of fertilisable protoperithecia. These cell-fusion related processes include extracellular matrix deposition, hyphal attachment and envelopment. A novel phenotype of S. macrospora with defective ascogonial septation is presented. This pro22 mutant also has impaired hyphal cell fusion and produces only small, defective protoperithecia. The pro22 gene encodes a protein that is highly conserved throughout eukaryotes. Live-cell imaging revealed that this PRO22 protein is localised in the dynamic tubular and vesicular vacuolar-network of the colony periphery and in ascogonia. PRO22 is absent from the large spherical vacuoles in the vegetative hyphae of the sub-peripheral region of the colony. This points to a specific role of PRO22 in the tubular and vesicular vacuolar-network. Furthermore, the loss of intercalary septation in ascogonia suggests that PRO22 functions during the initiation of sexual development.

Solid-state lightings are becoming the popular choice for lightings due to its higher efficiency, improved colour rendering index and the flexibility of various size and shape. Halide perovskite has tunable colour emission, low disorder and is solution processable making it one of a popular choice as emitters. This thesis demonstrates the versatility of using halide perovskite material in light-emitting diodes. We demonstrate the first working perovskite light-emitting diode at room temperature by introducing thin layer of perovskite emitter which is crucial to confine the inherent free carriers in the material. We show that the 3D lead-halide bulk perovskite is bandgap tunable with emission in the green and red visible spectrum. Light-emitting diodes in the visible spectrum are common however near-infrared emission is a rarity. Lead is a heavy metal which is known for its toxicity. We tackled the issue of toxicity by replacing with tin and demonstrate tunable emission in the near-infrared region. Bulk perovskites have large binding energy which makes it difficult to confine the charges and form radiative recombination which is crucial for emission and efficiency of the device. We move into lower dimensionality perovskites by utilising all-inorganic perovskite nanoplatelets and show emission in the blue region.