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Mohamad Toha PhD Thesis Examination, Education
10:00 AM - 1:00 PM
May 1, 2015No Description
Philip Dluhy, MSC Thesis Defence, Department of Physics
10:30 AM - 2:00 PM
May 1, 2015Master of Science Thesis Defence Department of Physics Monday, 1 May 2015 at 11.00am in P8445.2 Examining committee: Chair: TBA Senior Supervisor: Mike Thewalt Supervisor: David Broun Internal Examiner: Simon Watkins SWITCHABLE RESONANT HYPERPOLARIZATION TRANSFER FROM PHOSPHORUS-31 NUCLEI TO SILICON-29 NUCLEI IN NATURAL SILICON Abstract Silicon has been the backbone of the microelectronics industry for decades. As spin-based technologies continue their rapid development, silicon is emerging as a material of primary interest for a number of these applications. There are several techniques that currently exist for polarizing the spin-one half silicon-29 nuclei, which account for 4.7% of the isotopic makeup of natural silicon (the other two stable isotopes, silicon-28 and silicon-30, have zero nuclear spin). Polarized silicon-29 nuclei may find use in quantum computing (QC) implementations and magnetic resonance (MR) imaging. Both of these applications benefit from the extremely long longitudinal and transverse relaxation times of the silicon-29 nuclear spins. However, the lack of interactions between the silicon-29 nuclei and their surroundings that allow for these long relaxation times also means that it is difficult to find a source of spin-polarization that effectively couples to the silicon-29 spin ensemble. We identify and exploit a field-dependent, frequency-matched resonant transfer process between phosphorus-31 donor and silicon-29 nuclear spins in natural silicon to efficiently hyperpolarize the bulk silicon-29 to over 6%. This all-optical technique requires no microwave irradiation, and the coupling can be switched off to recover the ultra-long nuclear spin relaxation lifetimes of silicon-29. This switchable hyperpolarization technique significantly enhances the usefulness of silicon-29 spins in QC and MR imaging applications.
Valerie A Sheppard, PhD Thesis Defence, SAR Faculty of Environment
10:00 AM - 1:30 PM
May 7, 2015Thesis title: Factors nurturing resilience in resort destination governance. Dr. Peter Williams (Sr. Supervisor) Dr. Alison Gill (Supervisor) Dr. Mark Wexler (Supervisor) Dr. Sean Markey (Internal Examiner) Dr. Pietro Beritelli (External Examiner). Resilience is a concept of growing interest amongst scholars who seek to understand how communities may better adapt to change. From a tourism perspective, the dynamic nature of the industry appears to provide it with an ability to cope with a range of system changes; however, tourism communities are at risk and vulnerable to a variety of shocks (e.g. disease outbreaks, terrorist attacks, tsunamis,) and stressors (e.g. prolonged economic recessions, climate change, changing demographics, et cetera). This research draws upon and applies the socio-ecological resilience (SER) framework developed by Ruiz-Ballesteros (2011) to understand the factors that nurture resilience in sustainability-focused governance systems. It presents the findings from a case study undertaken in the mountain resort community of Whistler, British Columbia, Canada. The findings are drawn from 45 key informant interviews, participant observation, and document analysis. This study corroborates past research, which described four sets of socio-ecological systems-based factors that enable or enhance resilience at the community level. However, it extends these findings and offers: 1) new insights related to a set of individually based factors that also appear to shape a resort community’s resilience. This study proposes an extended SER framework reflective of this finding; 2) insights related to how a variety of shocks and stressors affected a resort destination’s sustainability-focused governance system; and, 3) insights into the role of governance actors in enhancing governance and resort community resilience. Overall, the research contributes to the theoretical and applied dimensions of resilience, resort destination governance, shocks and stressors, and sustainable tourism knowledge.
SFU Imposter Syndrome Workshop April 27, 2015
You're invited to join us for SFU's first workshop on imposter syndrome. There is a limit of 40 registrants.
External Award: John W. Davies Memorial Award April 24, 2015
An award of $3,000 is offered by the Society of Naval Architects and Marine Engineers, Arctic Section
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