200,535 research outputs found
bruce-chappell/SunnyNet: Generalized SunnyNet
No full textThis release generalizes the SunnyNet framework and adds documentatio
The Day (2)
No full text(Color) This postcard is a reprinting of Chappell's poem, "The Day," reprinted from London's "Daily Express." The card indicates that this particular poem elevated Chappell to the "rank of a national poet." Because of his work as a porter at a Bath station, his nickname is the "Bath Railway Poet."; The card is uninscribed and unposted
Establishing a Standardized Clinical Assessment Tool of Pathologic and Prosthetic Hand Function: Normative Data, Reliability, and Validity
No full textABSTRACT. Light CM, Chappell PH, Kyberd PJ. Establishing a standardized clinical assessment tool of pathologic and prosthetic hand function: normative data, reliability, and validity. Arch Phys Med Rehabil 2002;83:776-83. Objective: To develop a new assessment procedure, the Southampton Hand Assessment Procedure (SHAP), that allows contextual results of hand function to be obtained readily in a clinical environment. Design: Reliability (test-retest, interrater) and validity (criterion, content) of new assessment procedure against standard medical outcome measure techniques. Setting: Normative data collected in a university laboratory. Participants: Twenty-four volunteers selected on the basis of optimum hand function using these criteria: age (range, 18-25y), and no adverse hand trauma, neurologic condition, or disabling effects of the upper limb. Interventions: Not applicable. Main Outcome Measures: The normative control group was assessed for variability, and the procedure measured in terms of interrater and test-retest reliability. The absence of a direct comparison prevents a criterion standard from being established; however, content validity was shown by expert peer review. Results: The control group data were shown to be multivariate gaussian; test-retest and interrater reliability were demonstrated at the 95% confidence level. The content validity was demonstrated by peer panel approval. Conclusions: Results of the control group established the statistical integrity of SHAP. Clinical trials are underway, although more extensive use of the procedure is advocated in primary care and rehabilitation centers where physiotherapy and occupational therapy are actively used in hand rehabilitation
The functional form of the lognormal distribution as a sum of decaying exponential and sinusoidal terms applied to the isometric pinch force of human fingers
No full textThe transient data of the pinch force produced between the human forefinger and thumb have been shown to fit the functional form of the well-known lognormal density function. Isometeric force generation is achieved by the stochastic recruitment of individual motor units, which sum together. Evidence from animal and human experiments demonstrates that the force generation can be modelled by underdamped terms. It is shown that a lognormal time series (distribution) can be fitted to a sum of exponential decaying sinusoidal terms
The Day (1)
No full textTRANSCRIPTION; MESSAGE: Many Thank for P- just what I would love happy Xmas S.; SENT TO: Miss Smith; Wier Bank; Broom Rd; Teddington(Color) This postcard is a reprinting of Chappell's poem, "The Day," reprinted from London's "Daily Express." The card indicates that this particular poem elevated Chappell to the "rank of a national poet." Because of his work as a porter at a Bath station, his nickname is the "Bath Railway Poet." The British, green, halfpenny stamp is cleary postmarked Cosham, 11:30 A.M. on December 24, 1914. The card is sent to "Miss Smith," for Christmas, from "S.
Active control with dielectric barrier discharge actuators applied to high-lift devices
No full textAn experimental investigation examined the capability of dielectric barrier discharge (DBD) actuators to control a high-lift device system. Aerodynamic tests investigated the potential of utilising the actuator to control the flap side-edge vortex flow field. Acoustic tests examined the attenuation of slat noise with a DBD actuator. The sparse knowledge related to the control of a vortex flow field with a DBD actuator necessitated a more fundamental study that used a NACA 0015 wing. From this study, it was shown that the application of control resulted in a more diffused tip vortex. The actuator's ability to control the evolving vortex flow field was weakly dependent on the Reynolds number but strongly dependent on the angle of attack. Consequently, a DBD actuator was applied to a flap side edge. However, it was concluded that the actuator had no discernible effect on the flow field due to its addition of momentum being too low to destabilise the formation of the flap side-edge vortex. The slat research concerned the attenuation of the leading-edge component of high-lift device noise. At an angle of attack of two degrees, several tonal noise components with broadband content appeared in the slat noise spectrum. These noise features were successfully suppressed with a DBD actuator operating in open-loop control. For closedloop control, a quasi-static feedback controller was implemented. Comparable levels of performance were obtained for both control methods with more than a 20 dB reduction achieved in the dominant tonal noise feature. The research conducted shed new light on the application of DBD actuators to control the high-lift device system. However, further research is needed if the device is to be utilised to control flap side-edge flow field. The attenuation of slat tonal noise with broadband content was achieved with the actuator
Thick-film force, slip and temperature sensors for a prosthetic hand
No full textThick-film static and dynamic force sensors have been investigated for their suitability to measure the grip forces exerted upon an object held by a prosthetic hand, and to detect and correspondingly react to the possible slip of a gripped item. The static force sensors exploit the piezoresistive characteristics of commercially available thick-film pastes whilst the dynamic slip sensors utilise the piezoelectric behaviour of proprietary PZT pastes (lead zirconate titanate). The sensors are located upon stainless steel cantilever type structures that will be placed at the fingertips of each digit of the prosthetic hand. Temperature sensors are also included to provide temperature compensation for the force sensors and to prevent accidental thermal damage to the prosthesis. Results have shown that the static force sensor is capable of measuring fingertip forces in excess of 100 N, with an electrical half-bridge configuration sensitivity approaching 10 ?V/V•N (with scope for improvement) and maximum hysteresis below 4% of full scale, depending on the manner by which the cantilever sensor array is attached to the finger. Failure in the bonding mechanism that secures the PZT layer to the stainless steel cantilever meant that the proposed dynamic force sensor could not be evaluated. However, investigations using the same sensor design fabricated on an alumina substrate have shown the potential of the PZT dynamic force sensor to measure vibration and hence potentially operate as a slip sensor
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