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60 results for “propulsion”
Beneficial wake-capture effect for forward propulsion with a restrained wing-pitch motion of a butterfly
Unlike other insects, a butterfly uses a small amplitude of the wing-pitch motion for flight. From an analysis of the dynamics of real flying butterflies, we show that the restrained amplitude of the wing-pitch motion enhances the wake-capture effect so as to enhance forward propulsion. A numerical simulation refined with experimental data shows that, for a small amplitude of the wing-pitch motion, the shed vortex generated in the downstroke induces air in the wake region to flow towards the wings, which enables a butterfly to capture this induced flow and to acquire an additional forward propulsion. When the amplitude of the wing-pitch motion exceeds 45<sup>o</sup>, the flow induced by the shed vortex drifts away from the wings; it attenuates the wake-capture effect and causes the butterfly to lose a part of its forward propulsion. Our results provide a physical elucidation for a butterfly adopting a small amplitude of the wing-pitch motion to enhance the wake-capture effect and forward propulsion. This work clarifies the variation of the flow field correlated with the wing-pitch motion, which is useful in the design of a micro-aerial vehicle.
Orientation-dependent propulsion of active Brownian spheres: from self-advection to programmable cluster shapes
<p>Supplemental data for the following manuscript: Stephan Bröker, Jens Bickmann, Michael te Vrugt, Michael E. Cates, Raphael Wittkowski, "Orientation-dependent propulsion of active Brownian spheres: from self-advection to programmable cluster shapes".</p>
A Wheelchair Propulsion Training Program
ClinicalTrials.gov study NCT04009187. IPD Sharing: Not stated. Countries: 1. Publications: 12.
Motor Learning-based Wheelchair Propulsion Training for Older Adults
ClinicalTrials.gov study NCT02123043. IPD Sharing: NO. Countries: 1. Publications: 1.
The Influence of Seat Height on Hemiplegic-pattern Propulsion of Manual Wheelchairs
ClinicalTrials.gov study NCT03330912. IPD Sharing: NO. Countries: 1. Publications: 2.
Improving Propulsion of the Paretic Leg In Chronic Stroke
ClinicalTrials.gov study NCT04650802. IPD Sharing: NO. Countries: 1. Publications: 1.
Effect of Manual Wheelchair Propulsion Workload on Speed, Energy Expenditure, and Propulsion Mechanics
ClinicalTrials.gov study NCT04987177. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Facilitation of Oral Bolus Propulsion Using Electropalatography in Patients With Dysphagia
ClinicalTrials.gov study NCT00001718. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Effect of Seat Height and Angle on Wheelchair Foot Propulsion
ClinicalTrials.gov study NCT06035484. IPD Sharing: NO. Countries: 1. Publications: 2.
Fatigue Induced by Overground Wheelchair Propulsion in Persons With a Spinal Cord Injury: Upper Limb Saving or Straining?
ClinicalTrials.gov study NCT03153033. IPD Sharing: UNDECIDED. Countries: 1. Publications: 9.
Data from: Field swimming behavior in largemouth bass deviates from predictions based on economy and propulsive efficiency
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Generation of Propulsive Force via Vertical Undulations in Snakes
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Data from: Propulsion in hexapod locomotion: how do desert ants traverse slopes?
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Beneficial wake-capture effect for forward propulsion with a restrained wing-pitch motion of a butterfly
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Data from: Reorientation and propulsion in fast-starting zebrafish larvae: an inverse dynamics analysis
Most fish species use fast starts to escape from predators. Zebrafish larvae perform effective fast starts immediately after hatching. They use a C-start, where the body curls into a C-shape, and then unfolds to accelerate. These escape responses need to fulfil a number of functional demands, under the constraints of the fluid environment and the larva's body shape. Primarily, the larvae need to generate sufficient escape speed in a wide range of possible directions, in a short-enough time. In this study, we examined how the larvae meet these demands. We filmed fast starts of zebrafish larvae with a unique five-camera setup with high spatiotemporal resolution. From these videos, we reconstructed the three-dimensional swimming motion with an automated method and from these data calculated resultant hydrodynamic forces and, for the first time, 3D torques. We show that zebrafish larvae reorient mostly in the first stage of the start by producing a strong yaw torque, often without using the pectoral fins. This reorientation is expressed as the body angle, a measure that represents the rotation of the complete body, rather than the commonly used head angle. The fish accelerates its centre of mass mostly in stage 2 by generating a considerable force peak while the fish "unfolds". The escape direction of the fish correlates strongly with the amount of body curvature in stage 1, while the escape speed correlates strongly with the duration of the start. This may allow the fish to independently control the direction and speed of the escape.
Data from: Does dynamic stability govern propulsive force generation in human walking?
Before succumbing to slower speeds, older adults may walk with a diminished push-off to prioritize stability over mobility. However, direct evidence for trade-offs between push-off intensity and balance control in human walking, independent of changes in speed, has remained elusive. As a critical first step, we conducted two experiments to investigate: (i) the independent effects of walking speed and propulsive force (FP) generation on dynamic stability in young adults, and (ii) the extent to which young adults prioritize dynamic stability in selecting their preferred combination of walking speed and FP generation. Subjects walked on a force-measuring treadmill across a range of speeds as well as at constant speeds while modulating their FP according to a visual biofeedback paradigm based on real-time force measurements. In contrast to improvements when walking slower, walking with a diminished push-off worsened dynamic stability by up to 32%. Rather, we find that young adults adopt an FP at their preferred walking speed that maximizes dynamic stability. One implication of these findings is that the onset of a diminished push-off in old age may independently contribute to poorer balance control and precipitate slower walking speeds.
Biofeedback to Increase Propulsion During Walking After Stroke
ClinicalTrials.gov study NCT02667392. IPD Sharing: NO. Countries: 1. Publications: 0.
Data from: Does dynamic stability govern propulsive force generation in human walking?
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Data from: Reorientation and propulsion in fast-starting zebrafish larvae: an inverse dynamics analysis
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Data from: Joint torques in a freely walking insect reveal distinct functions of leg joints in propulsion and posture control
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.