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15 results for “latches”
Geometric latches enable tuning of ultrafast, spring-propelled movements
<p>The smallest, fastest, repeated-use movements are propelled by power-dense elastic mechanisms, yet the key to their energetic control may be found in the latch-like mechanisms that mediate transformation from elastic potential energy to kinetic energy. Here we test how geometric latches enable consistent or variable outputs in ultrafast, spring-propelled systems. We constructed a reduced-order mathematical model of a spring-propelled system that uses a torque reversal (over-center) geometric latch. We parameterized the model to match the scales and mechanisms of ultrafast systems, specifically snapping shrimp. We simulated geometric and energetic configurations that enabled or reduced variation of their strike durations and dactyl rotations given variation of stored elastic energy and latch mediation. We then collected an experimental dataset of the energy storage mechanism and ultrafast snaps of live snapping shrimp (<em>Alpheus</em> <em>heterochaelis</em>) and compared our simulations to their configuration. We discovered that snapping shrimp store elastic energy through deformation of the propodus exoskeleton. Regardless of the amount of variation in spring loading duration, strike durations were far less variable than spring loading durations. When we simulated this species' morphological configuration in our mathematical model, we found that the low variability of strike duration is consistent with their torque reversal geometry. Even so, our simulations indicate that torque reversal systems can achieve either variable or invariant outputs through small adjustments to geometry. Our combined experiments and mathematical simulations reveal the capacity of geometric latches to enable, reduce, or enhance variation of ultrafast movements in biological and synthetic systems. </p>
Geometric latches enable tuning of ultrafast, spring-propelled movements
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Data from: Adhesive latching and legless leaping in small, worm-like insect larvae
Jumping is often achieved using propulsive legs, yet legless leaping has evolved multiple times. We examined the kinematics, energetics, and morphology of long-distance jumps produced by the legless larvae of gall midges (Asphondylia sp.). They store elastic energy by forming their body into a loop and pressurizing part of their body to form a transient leg. They prevent movement during elastic loading by placing two regions covered with microstructures against each other, which likely serve as a newly-described adhesive latch. Once the latch releases, the transient leg launches the body into the air. Their average takeoff speeds (mean: 0.85 m s-1; range: 0.39-1.27 m s-1) and horizontal travel distances (up to 36 times body length or 121 mm) rival those of legged insect jumpers and their mass specific power density (mean: 910 W kg-1; range: 150-2420 W kg-1) indicates the use of elastic energy storage to launch the jump. Based on the forces reported for other microscale adhesive structures, the adhesive latching surfaces are sufficient to oppose the loading forces prior to jumping. Energetic comparisons of insect larval crawling versus jumping indicate that these jumps are orders of magnitude more efficient than would be possible if the animals had crawled an equivalent distance. These discoveries integrate three vibrant areas in engineering and biology - soft robotics, small, high acceleration systems, and adhesive systems - and point toward a rich, and as-yet untapped area of biological diversity of worm-like, small, legless jumpers.
Vintage doorknobs and a latch on an antique door
Detailed photogrammetry made with set of 79 photos captured with Xiaomi Poco X3, proceed with #Colmap, #OpenMVS and #Blender3d. Source: Objaverse 1.0 / Sketchfab
Source data for the publication "Single-shot latched readout of a quantum dot qubit using barrier gate pulsing"
<p>This repository contains data and source code for the publication "Single-shot latched readout of a quantum dot qubit using barrier gate pulsing."</p>
Spring and latch dynamics can act as control pathways in ultrafast systems
<p><span>Ultrafast movements propelled by springs and released by latches are thought limited to energetic adjustments prior to movement and seemingly cannot adjust once movement begins. Even so, across the tree of life, ultrafast organisms navigate dynamic environments and generate a range of movements, suggesting unrecognized capabilities for control. We develop a framework of control pathways leveraging the non-linear dynamics of spring-propelled, latch-released systems. We analytically model spring dynamics and develop reduced-parameter models of latch dynamics to quantify how they can be tuned internally or through changing external environments. Using Lagrangian mechanics, we test feedforward and feedback control implementation via spring and latch dynamics. We establish through empirically-informed modeling that ultrafast movement can be controllably varied during latch release and spring propulsion. A deeper understanding of the interconnection between multiple control pathways, and the tunability of each control pathway, in ultrafast biomechanical systems presented here has the potential to expand the capabilities of synthetic ultra-fast systems and provides a new framework to understand the behaviors of fast organisms subject to perturbations and environmental non-idealities.</span></p>
Latch-based control of energy output in spring actuated systems
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Data from: Adhesive latching and legless leaping in small, worm-like insect larvae
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Spring and latch dynamics can act as control pathways in ultrafast systems
Open the record for dataset details and reuse information.
LATCH: Lactation Advice Thru Texting Can Help
ClinicalTrials.gov study NCT02214849. IPD Sharing: Not stated. Countries: 1. Publications: 1.
The LATCHING Pilot Project
ClinicalTrials.gov study NCT03442517. IPD Sharing: Not stated. Countries: 1. Publications: 1.
LATe Cerclage in High-risk Pregnancies (LATCH)
ClinicalTrials.gov study NCT06036446. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Effectiveness of Breastfeeding Techniques to Improve Latching and Prevention of Nipplesoreness
ClinicalTrials.gov study NCT06108154. IPD Sharing: Not stated. Countries: 1. Publications: 0.
The Effect of Artificial-Intelligence-Assisted Videos on Breastfeeding Self-Efficacy, Motivation, and LATCH Scores in First-Time Mothers
ClinicalTrials.gov study NCT07369947. IPD Sharing: NO. Countries: 1. Publications: 0.
Comparison of Adhesive Latch Device to Subcuticular Skin Closure at the Time of Cesarean Section
ClinicalTrials.gov study NCT03052647. IPD Sharing: NO. Countries: 1. Publications: 0.
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International Brain Laboratory public data
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OpenNeuro
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