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56 results for “mechanical performance”
Diagnostic Performance of Arterial Time for CT Assessment of Parietal Enhancement Defect for the Diagnosis of Ischemia in Mechanical Small Bowel Occlusions: a Comparative Study With Portal Time
ClinicalTrials.gov study NCT04880421. IPD Sharing: Not stated. Countries: 1. Publications: 4.
Cardiac Performance in Mechanically Ventilated COVID-19 Patients
ClinicalTrials.gov study NCT04628195. IPD Sharing: UNDECIDED. Countries: 1. Publications: 20.
Frequency of Self-performed Mechanical Control of Plaque
ClinicalTrials.gov study NCT02684682. IPD Sharing: NO. Countries: 1. Publications: 2.
The Effect of Different Exercise Approaches on Passive Mechanical Properties of Hamstring and Quadriceps Muscles, Strength and Jumping Performance
ClinicalTrials.gov study NCT06808919. IPD Sharing: UNDECIDED. Countries: 1. Publications: 2.
Correlations Among Functional Performance, Muscle Strength and Weaning Rate in Mechanically Ventilated Patients
ClinicalTrials.gov study NCT03894293. IPD Sharing: NO. Countries: 1. Publications: 3.
Data from: How biological attention mechanisms improve task performance in a large-scale visual system model
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Data from: Model sensitivity and use of the comparative finite element method in mammalian jaw mechanics: mandible performance in the Gray Wolf
Finite Element Analysis (FEA) is a powerful tool gaining use in studies of biological form and function. This method is particularly conducive to studies of extinct and fossilized organisms, as models can be assigned properties that approximate living tissues. In disciplines where model validation is difficult or impossible, the choice of model parameters and their effects on the results become increasingly important, especially in comparing outputs to infer function. To evaluate the extent to which performance measures are affected by initial model input, we tested the sensitivity of bite force, strain energy, and stress to changes in seven parameters that are required in testing craniodental function with FEA. Simulations were performed on FE models of a Gray Wolf (Canis lupus) mandible. Results showed that unilateral bite force outputs are least affected by the relative ratios of the balancing and working muscles, but only ratios above 0.5 provided balancing-working side joint reaction force relationships that are consistent with experimental data. The constraints modeled at the bite point had the greatest effect on bite force output, but the most appropriate constraint may depend on the study question. Strain energy is least affected by variation in bite point constraint, but larger variations in strain energy values are observed in models with different number of tetrahedral elements, masticatory muscle ratios and muscle subgroups present, and number of material properties. These findings indicate that performance measures are differentially affected by variation in initial model parameters. In the absence of validated input values, FE models can nevertheless provide robust comparisons if these parameters are standardized within a given study to minimize variation that arise during the model-building process. Sensitivity tests incorporated into the study design not only aid in the interpretation of simulation results, but can also provide additional insights on form and function.
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.
Data from: Bite of the cats: relationships between functional integration and mechanical performance as revealed by mandible geometry
Cat-like carnivorous mammals represent a relatively homogeneous group of species whose morphology appears constrained by exclusive adaptations for meat eating. We present the most comprehensive dataset of extant and extinct cat-like species to test for evolutionary transformations in size, shape and mechanical performance, i.e. von Mises stress and surface traction, of the mandible. Size and shape were both quantified by means of Geometric Morphometrics while mechanical performance was assessed applying Finite Element Models to two dimensional geometry of the mandible. Additionally, we present the first almost complete composite phylogeny of cat-like carnivorans for which well-preserved fossil mandibles are known, including representatives of 35 extant and 59 extinct species of Felidae, Nimravidae and Barbourofelidae. This phylogeny was used to test morphological differentiation, allometry, and covariation of mandible parts within and among clades. After taking phylogeny into account, we found that both allometry and mechanical variables exhibit a significant impact on mandible shape. We also tested if mechanical performance was linked to morphological integration. Mechanical stress at the coronoid process is higher in sabertoothed cats than in any other clade. This is strongly related to the high degree of covariation within modules of sabertooths mandibles. We found significant correlation between integration at the clade level and per-clade averaged stress values, on both original data and by partialling out interclade allometry from shapes when calculating integration. This suggests a strong interaction between natural selection and the evolution of developmental and functional modules at the clade level.
Data package for Cement with bacterial nanocellulose cured at reservoir temperature: Mechanical performance in the context of CO2 geological storage
<p>Data from experimental results and numerical modeling. The dataset is deposited in a .zip file or .xls(.xlsx) file format.</p> <p>Publication:</p> <p>Juan Cruz Barría, Diego Manzanal, Patricia Cerrutti, Jean-Michel Pereira,<br> Cement with bacterial nanocellulose cured at reservoir temperature: Mechanical performance in the context of CO2 geological storage,<br> Geomechanics for Energy and the Environment,<br> 2021,<br> 100267,<br> ISSN 2352-3808,<br> https://doi.org/10.1016/j.gete.2021.100267.<br> (https://www.sciencedirect.com/science/article/pii/S2352380821000356)<br> Keywords: CO2 geological storage; Cement paste; Bacterial nanocellulose; Reservoir temperature; Chemo-hydro-mechanical couplings</p> <p> </p> <p> </p>
Effect of modulation periods on the mechanical and tribological performance of MoS2-TiL/MoS2-TiH multilayer coatings
<p class="18">MoS<sub><span>2</span></sub>–Ti<sub><span>L</span></sub>/MoS<sub><span>2</span></sub>–Ti<sub><span>H</span></sub> multilayered coatings (where L and H represent low- and high-powered of the sputtering <span>titanium</span> target) exhibit excellent mechanical and tribological performance owing to their multilayered microstructure. Herein, the effect of two different modulation periods on the mechanical and tribological performance of the multilayered coatings was studied. The performance of the coatings were found to depend on modulation periods of single layer thickness and thickness ratio respectively. When the thickness ratio of MoS<sub><span>2</span></sub>–Ti<sub><span>L</span></sub> layer to MoS<sub><span>2</span></sub>–Ti<sub><span>H</span></sub> layer is fixed with different number of layers, the adverse effects of the interface outweigh the beneficial effect; thus, the mechanical and tribological performance of the multilayered coatings are improved with an increase in the single layer thickness. When the effect of the multilayer interfaces on the studied coatings is similar with the same number of layers, the MoS<sub><span>2</span></sub>–Ti<sub><span>H</span></sub> layer has more impact on the hardness of the MoS<sub><span>2</span></sub>–Ti<sub><span>L</span></sub>/MoS<sub><span>2</span></sub>–Ti<sub><span>H</span></sub> multilayered coatings, whereas the MoS<sub><span>2</span></sub>–Ti<sub><span>L</span></sub> layer substantially affects the friction and wear resistance.</p>
Data from: Performance of shark teeth during puncture and draw: implications for the mechanics of cutting
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Data from: Measuring sperm swimming performance in birds: effects of dilution, suspension medium, mechanical agitation, and sperm number
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Data from: Model sensitivity and use of the comparative finite element method in mammalian jaw mechanics: mandible performance in the Gray Wolf
Open the record for dataset details and reuse information.
Data from: Bite of the cats: relationships between functional integration and mechanical performance as revealed by mandible geometry
Open the record for dataset details and reuse information.
Effect of modulation periods on the mechanical and tribological performance of MoS2-TiL/MoS2-TiH multilayer coatings
Open the record for dataset details and reuse information.
Mechanisms and pathways of bone metastasis: challenges and pitfalls of performing molecular research on patient samples
GEO Series GSE14776. Homo sapiens. 14 samples. Type: Expression profiling by array.
Intermittent glucocorticoid treatment enhances skeletal muscle performance through sexually dimorphic mechanisms [RNA-seq]
GEO Series GSE168964. Mus musculus. 18 samples. Type: Expression profiling by high throughput sequencing.
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.
Clinical Performance and Wear Mechanism of Hot-Pressed Ceramic Crowns
ClinicalTrials.gov study NCT00889239. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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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.