Investigation of refracting flows for acoustic suppression

An experimental investigation to determine the possibility of using refracting flows for the suppression of aircraft inlet noise is described. Observations of wave refraction in duct flows and measurements of the increase in effectiveness of acoustic linings due to refraction have suggested methods for the design of engine inlet ducts which can either suppress noise internally or direct it to where it causes less annoyance

The Law Reform Commission of British Columbia a Perspective

The Law Reform Commission of British Columbia was constituted by the Law Reform Commission Act\u27 which became law on July 1, 1969. The Commission began functioning in 1970, and is therefore nearing the end of its sixth year of activity. As the original programme of the Commission was designed to be completed in five years, it is appropriate that this opportunity should arise for both retrospective and prospective reflection on its work. The first six years of the Commission\u27s life have been productive and comparatively successful in terms of the subsequent legislative history of its Reports, but for present purposes their most interesting aspect is that they have been years of experiment - in the nature of the projects which have been undertaken, the way in which they have been carried out, the constitution of the Commission itself, its staffing policy and the division of labour between the Commission and its full-time staff on the one hand, and external consultants on the other. The Commission in 1976 is quite different from the Commission of 1970, and the primary purpose of this note is to outline the progress of and changes in the Commission in the intervening years, and to draw certain tentative conclusions therefrom on the appropriate role of a law reform commission in the process of government

The Law Reform Commission of British Columbia a Perspective

The Law Reform Commission of British Columbia was constituted by the Law Reform Commission Act\u27 which became law on July 1, 1969. The Commission began functioning in 1970, and is therefore nearing the end of its sixth year of activity. As the original programme of the Commission was designed to be completed in five years, it is appropriate that this opportunity should arise for both retrospective and prospective reflection on its work. The first six years of the Commission\u27s life have been productive and comparatively successful in terms of the subsequent legislative history of its Reports, but for present purposes their most interesting aspect is that they have been years of experiment - in the nature of the projects which have been undertaken, the way in which they have been carried out, the constitution of the Commission itself, its staffing policy and the division of labour between the Commission and its full-time staff on the one hand, and external consultants on the other. The Commission in 1976 is quite different from the Commission of 1970, and the primary purpose of this note is to outline the progress of and changes in the Commission in the intervening years, and to draw certain tentative conclusions therefrom on the appropriate role of a law reform commission in the process of government

The Law Reform Commission of British Columbia a Perspective

The Law Reform Commission of British Columbia was constituted by the Law Reform Commission Act\u27 which became law on July 1, 1969. The Commission began functioning in 1970, and is therefore nearing the end of its sixth year of activity. As the original programme of the Commission was designed to be completed in five years, it is appropriate that this opportunity should arise for both retrospective and prospective reflection on its work. The first six years of the Commission\u27s life have been productive and comparatively successful in terms of the subsequent legislative history of its Reports, but for present purposes their most interesting aspect is that they have been years of experiment - in the nature of the projects which have been undertaken, the way in which they have been carried out, the constitution of the Commission itself, its staffing policy and the division of labour between the Commission and its full-time staff on the one hand, and external consultants on the other. The Commission in 1976 is quite different from the Commission of 1970, and the primary purpose of this note is to outline the progress of and changes in the Commission in the intervening years, and to draw certain tentative conclusions therefrom on the appropriate role of a law reform commission in the process of government

The Law Reform Commission of British Columbia a Perspective

The Law Reform Commission of British Columbia was constituted by the Law Reform Commission Act\u27 which became law on July 1, 1969. The Commission began functioning in 1970, and is therefore nearing the end of its sixth year of activity. As the original programme of the Commission was designed to be completed in five years, it is appropriate that this opportunity should arise for both retrospective and prospective reflection on its work. The first six years of the Commission\u27s life have been productive and comparatively successful in terms of the subsequent legislative history of its Reports, but for present purposes their most interesting aspect is that they have been years of experiment - in the nature of the projects which have been undertaken, the way in which they have been carried out, the constitution of the Commission itself, its staffing policy and the division of labour between the Commission and its full-time staff on the one hand, and external consultants on the other. The Commission in 1976 is quite different from the Commission of 1970, and the primary purpose of this note is to outline the progress of and changes in the Commission in the intervening years, and to draw certain tentative conclusions therefrom on the appropriate role of a law reform commission in the process of government

The Law Reform Commission of British Columbia a Perspective

The Law Reform Commission of British Columbia was constituted by the Law Reform Commission Act\u27 which became law on July 1, 1969. The Commission began functioning in 1970, and is therefore nearing the end of its sixth year of activity. As the original programme of the Commission was designed to be completed in five years, it is appropriate that this opportunity should arise for both retrospective and prospective reflection on its work. The first six years of the Commission\u27s life have been productive and comparatively successful in terms of the subsequent legislative history of its Reports, but for present purposes their most interesting aspect is that they have been years of experiment - in the nature of the projects which have been undertaken, the way in which they have been carried out, the constitution of the Commission itself, its staffing policy and the division of labour between the Commission and its full-time staff on the one hand, and external consultants on the other. The Commission in 1976 is quite different from the Commission of 1970, and the primary purpose of this note is to outline the progress of and changes in the Commission in the intervening years, and to draw certain tentative conclusions therefrom on the appropriate role of a law reform commission in the process of government

Infinite-randomness critical point in the two-dimensional disordered contact process

We study the nonequilibrium phase transition in the two-dimensional contact process on a randomly diluted lattice by means of large-scale Monte-Carlo simulations for times up to $10^{10}$ and system sizes up to $8000 \times 8000$ sites. Our data provide strong evidence for the transition being controlled by an exotic infinite-randomness critical point with activated (exponential) dynamical scaling. We calculate the critical exponents of the transition and find them to be universal, i.e., independent of disorder strength. The Griffiths region between the clean and the dirty critical points exhibits power-law dynamical scaling with continuously varying exponents. We discuss the generality of our findings and relate them to a broader theory of rare region effects at phase transitions with quenched disorder. Our results are of importance beyond absorbing state transitions because according to a strong-disorder renormalization group analysis, our transition belongs to the universality class of the two-dimensional random transverse-field Ising model.Comment: 13 pages, 12 eps figures, final version as publishe

Inducer dynamics full-flow, full-admission hydraulic turbine drive Interim report for tasks 1, 2, and 3

Hydrodynamical and mechanical design layout for two-speed hydraulic turbine inducer, computer simulation of pumping system and test facility performance, and study of demonstration uni

Optimizing Spatial Filters for BCI: Margin- and Evidence-Maximization Approaches

We present easy-to-use alternatives to the often-used two-stage Common Spatial Pattern + classifier approach for spatial filtering and classification of Event-Related Desychnronization signals in BCI. We report two algorithms that aim to optimize the spatial filters according to a criterion more directly related to the ability of the algorithms to generalize to unseen data. Both are based upon the idea of treating the spatial filter coefficients as hyperparameters of a kernel or covariance function. We then optimize these hyper-parameters directly along side the normal classifier parameters with respect to our chosen learning objective function. The two objectives considered are margin maximization as used in Support-Vector Machines and the evidence maximization framework used in Gaussian Processes. Our experiments assessed generalization error as a function of the number of training points used, on 9 BCI competition data sets and 5 offline motor imagery data sets measured in Tubingen. Both our approaches sho w consistent improvements relative to the commonly used CSP+linear classifier combination. Strikingly, the improvement is most significant in the higher noise cases, when either few trails are used for training, or with the most poorly performing subjects. This a reversal of the usual "rich get richer" effect in the development of CSP extensions, which tend to perform best when the signal is strong enough to accurately find their additional parameters. This makes our approach particularly suitable for clinical application where high levels of noise are to be expected

Liquid rocket engine axial-flow turbopumps

The axial pump is considered in terms of the total turbopump assembly. Stage hydrodynamic design, pump rotor assembly, pump materials for liquid hydrogen applications, and safety factors as utilized in state of the art pumps are among the topics discussed. Axial pump applications are included