Assessing Devolution in the Canadian North: A Case Study of the Yukon Territory

Despite a rich literature on the political and constitutional development of the Canadian territorial North, few scholars have examined the post-devolution environment in Yukon. This lacuna is surprising since devolution is frequently cited as being crucial to the well-being of Northerners, leading both the Government of Nunavut and the Government of the Northwest Territories to lobby the federal government to devolve lands and resources to them. This paper provides an updated historical account of devolution in Yukon and assesses its impact on the territory since 2003. Relying mainly on written resources and 16 interviews with Aboriginal, government, and industry officials in the territory, it highlights some broad effects of devolution and specifically analyzes the processes of obtaining permits for land use and mining. Our findings suggest that devolution has generally had a positive effect on the territory, and in particular has led to more efficient and responsive land use and mining permit processes

The hormonal control of hepatic metabolism in the rat

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The Integer Valued SU(3) Casson Invariant for Brieskorn spheres

We develop techniques for computing the integer valued SU(3) Casson invariant. Our method involves resolving the singularities in the flat moduli space using a twisting perturbation and analyzing its effect on the topology of the perturbed flat moduli space. These techniques, together with Bott-Morse theory and the splitting principle for spectral flow, are applied to calculate the invariant for all Brieskorn homology spheres.Comment: 50 pages, 3 figure

Intrusion detection through knowledge sharing

The financial losses caused by computer crimes have increased by more than $100 million every year since 1999. The combination of financial losses and high profile events such as the spread of the Code Red worm has sparked public interest in computer crime. With the increasing public awareness of the need for better computer security, companies are beginning to rely heavily on intrusion detection systems. Currently, security companies focus on the creation of complete, comprehensive intrusion detection products. So far no single product has been able to dominate the intrusion detection market. As a result, computer networks use multiple intrusion detection systems functioning independently of each other. There exists the possibility of better intrusion detection by linking the independent components into a knowledge-sharing system. With cooperative detection methods in mind, an outline for a knowledge-sharing protocol is developed. For this experiment the control is a hybrid intrusion detection system that is unable to share knowledge of previously detected attacks, and whose performance is effectively the sum of its components. The test IDS is the control system modified to take advantage of knowledge sharing. The experiment shows that better results can be achieved through the cooperation of the components of existing intrusion detection systems

Considerations for Testing Full-Scale Wind Turbine Nacelles with Hardware-in-the-Loop

Full-scale wind turbine nacelle testing with Hardware-In-the-Loop (HIL) configuration allows full operational certification testing with native nacelle controllers, as opposed to open-loop testing which requires significant modification of the controller to bypass missing subsystems when the nacelle is mounted on the test bench. Implementation of Hardware-In-the-Loop testing involves running a real-time simulation of a full turbine model in parallel with the test bench in order to account for the missing rotor, tower, platform, and actuators. For successful implementation of this method, first, the simulation model should be able to capture the dynamic characteristics of the turbine accurately while also meeting the real-time requirements. Second, the deviations resulting from the different boundary conditions between the drivetrain in a full turbine and the test bench environment should be mitigated. In the first part of the study, a sensitivity analysis is performed using a baseline wind turbine model to determine the minimum drivetrain fidelity level necessary to capture the dynamics with a focus on the torsional characteristics that are crucial for performing electro-mechanical certification tests. The results show that the torsional dynamics are dominated by the flexibility of the main shaft and the gearbox supports. The rest of the components can be significantly simplified thereby reducing the total number of modes and degrees of freedom for real-time execution. In the second part of the study, the reduced drivetrain model is utilized in a comparative analysis to quantify the deviations in torsional dynamics resulting from the rigid connections and test bench components (motor, reduction gearbox, and the load application unit) replacing the tower and rotor, respectively. It is found that the different mechanical interfaces can shift the first torsional mode of the drivetrain by as much as 19% which can significantly impact electro-mechanical responses. The feasibility of exploiting the test bench speed controller to introduce virtual inertia, damping, and stiffness and compensating for such differences is studied. It is demonstrated that the controller can be tuned to perform pole placement and match the torsional frequencies between the coupled test bench-nacelle and the full turbine. Finally, the performance of the tuned controller is verified using two case studies: a) free response to characterize the torsional responses in a low voltage ride through scenario, and b) forced response to evaluate its ability to track a highly dynamic speed profile resulting from a turbulent wind profile