4,349 research outputs found
Field investigation of deformation characteristics and stress mobilisation of a soil slope
Get PDFStress mobilisation and deformation of a slope are important for engineers to carry out reliable design of retaining systems. However, most case histories reported mainly on the response of pore-water pressure (PWP), whereas knowledge about the stress-deformation characteristics of slope is limited. In this study, a saprolitic soil slope was instrumented to monitor not only the responses of PWP but also horizontal stress and horizontal displacement. To assist in the interpretation of field data, a series of laboratory tests was conducted to characterise the volume change behaviour of soil taken from the site, under the effects of both net stress and suction. During a rainstorm event when positive PWP built up, a remarkably large displacement of 20 mm was recorded between 5.5 and 6 m depths, and the top 5 m of the slope exhibited translational down-slope movement. This caused an increase in effective horizontal stress by 350%, which reached a peak value close to 40% of an effective passive stress. During the subsequent dry season when suction was recovered, an up-slope rebound of 10 mm was recorded. Comparison of field and laboratory data reveals that the rebound was attributed to suction-induced soil shrinkage. This rebound led to a decrease in the effective horizontal stress previously built up during the storm event
Ultrahigh birefringence index-guiding photonic crystal fiber
Get PDFAuthor name used in this publication: Ming-Leung Vincent TseRefereed conference paper2013-2014 > Academic research: refereed > Refereed conference paperVersion of RecordPublishedCopyright retained by autho
Development and applications of dispersion controlled high nonlinearity microstructured fibres
No full textIn this thesis I investigate aspects of dispersion controlled high nonlinearity all silica holey fibre, including design, fabrication, sample applications, and modelling.Microstructured fibre fabrication allows for great flexibility in core and cladding structure designs, with the large available refractive index contrast between glass and air. This allows the control of waveguide dispersion across a wide wavelength range, which can be used to offset the material dispersion of the core glass. Therefore, this technology provides improved overall dispersion control via fibre design. This often requires a complex arrangement of air holes in the structure.The full fabrication procedures for small-core holey fibres are presented. In particular, the fabrication of fibres with a graded-hole-size structure is reported. A structural accuracy of ±6% is achieved and improvements are proposed for future work.A systematic study of the Supercontinuum Generation phenomenon is presented in this thesis. By using fibres with different dispersion profiles, pumping at 1.06 μm, the nonlinear effects such as Self-Phase-Modulation, Four-Wave-Mixing and Self-Soliton-Frequency-Shift, which dominate the spectral broadening in fibres with one or two zero-dispersion wavelengths are identified accordingly.The latest work has been focussed on controlled structural variation of holey fibres along their length to obtain fibre with a longitudinal variation of dispersion and nonlinearity. I fabricated a dispersion-decreasing holey fibre and performed the first demonstration of soliton compression in a holey fibre. A compression factor of 2 has been achieved with pJ pulses at 1.06 μm. Further numerical modelling has been carried out from a holey fibre design contour map, to optimize holey fibre tapers for soliton compression at 1.55 μm. A compression factor of 6 is possible in a 15-m holey fibre taper with a loss of 0.1 dB/m
sj-docx-1-ine-10.1177_15910199221148551 - Supplemental material for A comparison of antiplatelet therapy during the peri- and post-operative periods following flow-diverting stent insertion for unruptured intracranial aneurysms: A systematic review
No full textSupplemental material, sj-docx-1-ine-10.1177_15910199221148551 for A comparison of antiplatelet therapy during the peri- and post-operative periods following flow-diverting stent insertion for unruptured intracranial aneurysms: A systematic review by Agnes Lorraine Leung, Vincent Li, Laetitia Devilliers and Laetitia Hattingh in Interventional Neuroradiology</p
Intermodal coupling of supermodes in a twincore photonic crystal fiber and its application as a pressure sensor
No full textAuthor name used in this publication: Ming-Leung Vincent Tse2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Tan tao nei guan ren zhi zhi liao gai shan yi yu zheng zhuang de zhi liao ji zhi: jue cha qing gan yu ren zhi xi guan fan ying de zhong yao xing
No full textLeung, Alice.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 134-154).Abstracts also in Chinese; appendixes in Chinese.Title from PDF title page (viewed on 19, September, 2016).Leung, Alice
The second variation formula for exponentially harmonic maps
No full textAuthor name used in this publication: Leung-Fu CheungVersion of RecordPublishedVoR allowe
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