7,144 research outputs found
Why Patterns?
No full textThis item refers to an exhibition publication without an ISBN
This catalogue accompanied an exhibition called 'Why patterns?' which took its title from a work by modernist music composer Morton Feldmann.
The exhibition took place between 19th October and 18th November 2018 and included 15 artists.
The catalogue was written by David R Watson and Martyn Simpson
Cutaneous vascular response to local warming: a response to letter from Cracowski and Roustit
No full textBrief Investigatory Detentions: A Critique of R. v. Simpson
Get PDFIn this article, the author examines the brief investigative detention power created by the Ontario Court of Appeal in R. v. Simpson and challenges both the Court\u27s reasoning and the way in which the decision has been followed in other Canadian jurisdictions. The common law power to detain an individual, based upon prominent U.S. and British case law, is inconsistent with the previous Supreme Court jurisprudence on police powers. The author demonstrates this by analyzing several cases involving police powers and joins the list of commentators who have urged the country\u27s highest court to re-examine the Simpson doctrine. The author also argues that there has been a tendency for U.S. courts to grant increased discretion to the police even when such powers are unwarranted. There is a real possibility of a similar accretion of police powers in Canada. Moreover, the American experience also indicates that members of minority groups are frequently subjected to the rigours of brief investigative detention, often only because of their ethnic identity. Recent studies show that the same trend exists in Canada, serving to challenge democratic and egalitarian values that the Charter is designed to protect. The solution, according to the author, lies not with the Courts, but with Parliament taking the opportunity to define the extent and limits of brief investigative detentions
Understanding economic forecasts
No full textNine articles, originally presented at the Annual Festival of Science at the University of Sheffield in September 1999, explain new developments in economic forecasting. Papers examine how economists forecast (David F. Hendry); economic modeling for fun and profit (Paul Turner); making sense of published economic forecasts (Diane Coyle); forecast uncertainty in economic modeling (Neil R. Ericsson); evaluation of forecasts (Clive W. J. Granger); forecasting and the UK business cycle (Denise R. Osborn, Marianne Sensier, and Paul W. Simpson); modeling and forecasting at the Bank of England (Neal Hatch); forecasting the world economy (Ray Barrell); and the costs of forecast errors (Terence Burns). Hendry is Professor of Economics at Nuffield College, Oxford University. Ericsson is a staff economist at the Division of International Finance, Federal Reserve Board. Author and subject indexes
Understanding economic forecasts
No full textNine articles, originally presented at the Annual Festival of Science at the University of Sheffield in September 1999, explain new developments in economic forecasting. Papers examine how economists forecast (David F. Hendry); economic modeling for fun and profit (Paul Turner); making sense of published economic forecasts (Diane Coyle); forecast uncertainty in economic modeling (Neil R. Ericsson); evaluation of forecasts (Clive W. J. Granger); forecasting and the UK business cycle (Denise R. Osborn, Marianne Sensier, and Paul W. Simpson); modeling and forecasting at the Bank of England (Neal Hatch); forecasting the world economy (Ray Barrell); and the costs of forecast errors (Terence Burns). Hendry is Professor of Economics at Nuffield College, Oxford University. Ericsson is a staff economist at the Division of International Finance, Federal Reserve Board. Author and subject indexes
Nonlinear system analysis of local reflex control of locust hind limbs
No full textNonlinear Volterra type system identification models coupled with a Gaussian White Noise (GWN) stimulation signal provide an experimentally convenient and quick way to investigate the often complex and nonlinear interactions between the mechanical and neural elements of invertebrate reflex limb control systems. Previous steady state analysis has allowed the neurons in such systems to be categorised by their sensitivity to position, velocity or acceleration (system dynamics) and has improved understanding of network function. These neurons, however, are known to adapt their output amplitude or spike firing rate during repetitive stimulation and this transient response may be more important than the steady state response for reflex limb control. Furthermore, whilst the use of GWN for system identification can be theoretically and experimentally justified, the properties of this signal are very different from those received by the sensory, inter and motor neurons in the neural networks which monitor the position of the locusts leg under natural operating conditions. The current study provides improvements to the previously used experimental methods, equipment and nonlinear system identification methods. Validation of the models using biologically more realistic stimulation signals has been carried out to determine where they perform well and to identify their limitations. The use of the parsimonious cascade model structure, applied in a quasi stationary fashion coupled with Monte Carlo (MC) simulations, has been shown to provide a useful tool for the characterisation of the dynamics and nonlinear responses of the neuromuscular elements in a locust’s reflex limb control system during both transient and steady state response sections. This method been applied to test the null hypothesis that the dynamics and nonlinear responses of the locust’s Fast Extensor Tibia (FETi) motor neuron system are the same during transient and steady state sections. It can be concluded that key FETi system dynamics remain relatively unchanged during repetitive stimulation while output amplitude adaptation is occurring. Whilst some evidence of a significant change was found in parts of the system’s nonlinear response, the effect was small and probably of little physiological relevance. Analysis using biologically more realistic stimulation reinforces this conclusion
Tracking time-varying cerebral autoregulation in response to changes in respiratory PaCO2
No full textCerebral autoregulation has been studied by linear filter systems, with arterial blood pressure (ABP) as the input and cerebral blood flow velocity (CBFV— from transcranial Doppler Ultrasound) as the output. The current work extends this by using adaptive filters to investigate the dynamics of time-varying cerebral autoregulation during step-wise changes in arterial PaCO2. Cerebral autoregulation was transiently impaired in 11 normal adult volunteers, by switching inspiratory air to a CO2/air mixture (5% CO2, 30% O2 and 65% N2) for approximately 2 min and then back to the ambient air, causing stepwise changes in end-tidal CO2 (EtCO2). Simultaneously, ABP and CBFV were recorded continuously. Simulated data corresponding to the same protocol were also generated using an established physiological model, in order to refine the signal analysis methods. Autoregulation was quantified by the timevarying phase lead, estimated from the adaptive filter model. The adaptive filter was able to follow rapid changes in autoregulation, as was confirmed in the simulated data. In the recorded signals, there was a slow decrease in autoregulatory function following the step-wise increase in PaCO2 (but this did not reach a steady state within approximately 2 min of recording), with a more rapid change in autoregulation on return to normocapnia. Adaptive filter modelling was thus able to demonstrate time-varying autoregulation. It was further noted that impairment and recovery of autoregulation during transient increases in EtCO2 occur in an asymmetric manner, which should be taken into account when designing experimental protocols for the study of autoregulation
W. S. David Collection
No full textPhotograph of "Augusta Pioneers." L to R: top row: Lem Sneary; Frank Van Buskirk; W. S. David; Z. J. Clark; A. E. Allen; Second Row: G. W. Simpson; H. B. Wilson; C. E. Wood; Virgil Correll; Bottom: Harvey Bunce; Bill Hayes. Photo by Cyphers and Nelson, Augusta, Oklahoma Territory
Kanter Revisited: Gender, Power and (In)visibility
Get PDFThis paper revisits Kanter's (1977) seminal work Men and Women of the Corporation, rereading her account of numerical advantage and disadvantage through a poststructuralist lens which exposes hidden dimensions of gendered power. This lens is captured in the ‘(In)visibility Vortex’ (Lewis and Simpson, 2010) which highlights struggles and tensions around the norm through processes of preservation and concealment within the norm as well as dynamics of revealing, exposure and disappearance as features of the margins. The study draws on developments in feminist theorizing, specially around visibility, invisibility and power, to facilitate this rereading. In so doing, the author demonstrate that while Kanter retreated from explanations based on the gendering of organizations or from recognition of gendered power, these dynamics can be identified in her text. The authors suggest that rereading classic texts can surface dimensions of organizations that have contemporary significance and can inform future research
The spatial ecology of Rajidae from mark-recapture tagging and its implications for assessing fishery interactions and efficacy of Marine Protected Areas
No full textOften the ecology of a commercially fished species and the behaviour of the fishers are inextricably linked. An understanding of both species ecology and fisher behaviour are therefore fundamental for effective fisheries management. In Europe, Rajidae are commercially fished species that are vulnerable to overfishing, have historically been grouped in landings data and declines have been reported to the point of local extinction in some species. Management of these species is therefore important, however an understanding of species ecology and the way they interact with the fishery is lacking. Here we investigate how the differing ecology of four species affects interactions with the fishery by considering gear types, Marine Protected Areas, location of capture and geographic displacements. Our results demonstrate that the four species interacted differently with the fishery, for example Raja clavata were more commonly captured by static nets (69 % of recaptures) and Raja brachyura more commonly by trawlers (77 %). There were clear differences in the location of capture, depths and displacements of the four species resulting in differing interactions with existing management in the form of Marine Protected Areas. For example 53 % of R. clavata recaptures were within the boundaries of an MPA compared to 18 % for R. brachyura. These results provide important differences among species that are generally grouped by current management, emphasising the need for further species specific research to ensure effective management
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