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12 results for “cutting performance”
With a little help from my friends: individual and collaborative performance during trail clearing in leaf-cutting ants
<p>Social organisms express collaborative behaviours, allowing them to solve problems that exceed their individual capabilities. Group coordination and environmental context are some of the factors that may determine the performance of individual and collaborative strategies. Using the trail-clearing behaviour of leaf-cutting ants, we evaluated experimentally for both strategies whether the success probability and clearing time depend on problem characteristics and context. We placed obstacles of different sizes and shapes (problem characteristics), in trails with different foragers' fluxes and soil roughness (context) in 10 field nests of <i>Atta cephalotes, </i>and<i> </i>compared removal success (i.e. if ants could remove obstacles) and time of individual and collaborative strategies. Very large obstacles could only be removed collaboratively, confirming individual limitations for transporting large objects. For all obstacle shapes, collaborative removals were more successful but took longer, suggesting that coordination among individuals delays these actions. Individual strategies were faster, regardless of ant flux. However, as ant flux increased, removal success was higher for collaborative than for individual removals. Lastly, trail roughness had no effect. This work highlights one advantage of sociality, the option of collaboratively solving problems that exceed the individual abilities. In addition, it reveals the associated costs of joint actions, since they can be time-consuming presumably due to coordination problems.Social organisms express collaborative behaviours, allowing them to solve problems that exceed their individual capabilities. Group coordination and environmental context are some of the factors that may determine the performance of individual and collaborative strategies. Using the trail-clearing behaviour of leaf-cutting ants, we evaluated experimentally for both strategies whether the success probability and clearing time depend on problem characteristics and context. We placed obstacles of different sizes and shapes (problem characteristics), in trails with different foragers' fluxes and soil roughness (context) in 10 field nests of <i>Atta cephalotes, </i>and<i> </i>compared removal success (i.e. if ants could remove obstacles) and time of individual and collaborative strategies. Very large obstacles could only be removed collaboratively, confirming individual limitations for transporting large objects. For all obstacle shapes, collaborative removals were more successful but took longer, suggesting that coordination among individuals delays these actions. Individual strategies were faster, regardless of ant flux. However, as ant flux increased, removal success was higher for collaborative than for individual removals. Lastly, trail roughness had no effect. This work highlights one advantage of sociality, the option of collaboratively solving problems that exceed the individual abilities. In addition, it reveals the associated costs of joint actions, since they can be time-consuming presumably due to coordination problems.</p>
With a little help from my friends: individual and collaborative performance during trail clearing in leaf-cutting ants
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Data from: Performance of shark teeth during puncture and draw: implications for the mechanics of cutting
The performance of an organism's feeding apparatus has obvious implications for its fitness and survival. However, the majority of studies that focus on chondrichthyan feeding have largely ignored the role of teeth. Studying the functional morphology of shark teeth not only elucidates the biological role that teeth play in feeding, but also provides insight specifically into the evolution of shark feeding because teeth are often the only structures available in the fossil record. In the present study, we investigate the puncture and draw performance of three general categories of extant teeth, tearing-type, cutting-type, and cutting–clutching type, as well as three fossil morphologies, utilizing a universal testing system. Differences in puncturing performance occurred among different prey items, indicating that not all 'soft' prey items are alike. The majority of teeth were able to puncture different prey items, and differences in puncture performance also occurred among tooth types; however, few patterns emerged. In some cases, broader triangular teeth were less effective at puncturing than narrow-cusped teeth. There were no differences between the maximum draw forces and maximum puncture forces. Many of the shark teeth in the present study were not only able to perform draw and puncture equally well, but also many tooth morphologies were functionally equivalent to each other. The findings obtained in the present study lend little support to the belief that shark tooth morphology is a good predictor of biological role.
Evaluation of the iatrogenic sciatic nerve injury following double pelvic osteotomy performed with piezoelectric cutting tool in dogs.
<p>Intra-operative ilial osteotomy performed with piezoelectric cutting tool</p>
Data from: Performance of shark teeth during puncture and draw: implications for the mechanics of cutting
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Data from: Shear adhesive performance of leaf-cutting ant workers (Atta cephalotes)
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Data from: Investigation for the influence mechanism of rock damage on rock fragmentation and cutting performance by the discrete element method
Rock damage is one of the key factors in the design and model choice of the mining machinery. In this paper, the influence of rock damage on rock fragmentation and cutting performance was studied using PFC2D. In PFC2D software, it is feasible to get rock models with different damage factors by reducing the effective modulus, tensile and shear strength of bond by using the proportional factors. A linear relationship was obtained between the proportion factor and damage factor. Furthermore, numerical simulations of rock cutting with different damage factors were carried out. The results show that with the increase of damage factor, the rock cutting failure mode changes from tensile failure to brittle failure, accompanied by the propagation of macro crack, the formation of large debris and a notable decrease in the peak cutting force. The mean cutting force is negatively correlated with the damage factor. Besides, the instability of cutting force was evaluated by the fluctuation index (FI) and the pulse number (PN) of unit displacement. It is found that the cutting force is quite stable when the damage factor is 0.3, which facilitates the reliability of cutting machines. Finally, the cutting energy consumption of rock cutting with different damage factors was analyzed. The results reveal that the increase of damage factor can raise the rock cutting efficiency. The aforementioned findings play a significant role in the development of assisted rock-breaking technologies and the design of cutting head layout of mining machinery.
Performance, Safety and Efficiency Comparison Between 10,000 and 5,000 Cuts Per Minute Vitrectomy Using a 25G Cutter - A Prospective Randomized Controlled Study
ClinicalTrials.gov study NCT04859556. IPD Sharing: NO. Countries: 1. Publications: 0.
Assessing the Safety and Performance of the easyEndoTM Universal Linear Cutting Stapler in Laparoscopic Gastric Bypass Surgery
ClinicalTrials.gov study NCT03968757. IPD Sharing: NO. Countries: 1. Publications: 0.
A Randomised, Open-Label, Cross Over Group, Single-Centre Controlled Study To Evaluate The Clinical Performance Of Medium Cut-Off Membrane Dialyser Compared With High Flux Dialyser Among Patients With
ClinicalTrials.gov study NCT04160351. IPD Sharing: NO. Countries: 1. Publications: 0.
Determination of the Optimal Cut Off Value of the Modified Ashworth Scale in the Evaluation of Gait Performance and Functional Mobility in Individuals With Cerebral Palsy
ClinicalTrials.gov study NCT06826131. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Data from: Investigation for the influence mechanism of rock damage on rock fragmentation and cutting performance by the discrete element method
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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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
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