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107 results for “mechanical testing”
Code and data for: Nitrogen-induced hysteresis in grassland biodiversity: A theoretical test of litter-mediated mechanisms
Open the record for dataset details and reuse information.
A field test of mechanisms underpinning animal diversity in recently burned landscapes
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Towards deciphering dynamic changes and evolutionary mechanisms involved in the adaptation to low salinities in Ectocarpus (brown algae) - test dataset
<p><strong>Objectives :</strong></p> <p>Examine salinity tolerance and adaptations to low salinities in a freshwater strain of Ectocarpuson physiological and molecular levels.</p> <p><strong>Cohort :</strong></p> <p>Two clonal strains of Ectocarpus sp. (Ectocarpales, Phaeophyceae), the genome-sequenced marine strain (MS) (accession CCAP 1310/4, origin San Juan de Marcona, Peru) and a freshwater strain (FWS, accession CCAP 1310/196, origin Hopkins River Falls, Victoria, Australia) were used.</p> <p><strong>Mass spectrometer :</strong></p> <p><br> Gas chromatography-mass spectrometry (GC-MS) as described by Ritteret al.(2008) : samples were analysed with a Hewlett-Packard 5873 Mass Selective Detector interfaced to a Hewlett-Packard 6890 Series+ gas chromatograph (Agilent, Les Ullis, France).</p>
Data from: Real-time quantification of damage in structural materials during mechanical testing
A novel methodology is introduced for quantifying the severity and morphology of damage created during testing in composite components. The method utilises digital image correlation combined with image processing techniques to monitor the rate at which the strain field changes during mechanical tests. The methodology is demonstrated using two distinct experimental datasets, a ceramic matrix composite specimen loaded in tension at high temperature and nine polymer matrix composite specimens containing fibre-waviness defects loaded in bending. The changes in the strain field due to damage creation are shown to be a more effective indicator that the specimen has reached its proportional limit than using load-extension diagrams. The technique also introduces a new approach to using experimental data for creating maps showing the spatio-temporal distribution of damage in a component. These maps indicate where damage occurs in a component, its morphology and the time of occurrence. This presentation format is both easier and faster to interpret than the raw data which, for some tests, can consist of tens of thousands of images. This methodology has the potential to reduce the time taken to interpret large material test datasets whilst increasing the amount of knowledge that can be extracted from each test.
Data from: Transcriptomics and in vivo tests reveal novel mechanisms underlying endocrine disruption in an ecological sentinel, Nucella lapillus
Anthropogenic endocrine disruptors now contaminate all environments globally, with concomitant deleterious effects across diverse taxa. While most studies on endocrine disruption (ED) have focused on vertebrates, the superimposition of male sexual characteristics in the female dogwhelk, Nucella lapillus (imposex), caused by organotins, provides one of the most clearcut ecological examples of anthropogenically induced ED in aquatic ecosystems. To identify the underpinning mechanisms of imposex for this 'nonmodel' species, we combined Roche 454 pyrosequencing with custom oligoarray fabrication inexpensively to both generate gene models and identify those responding to chronic tributyltin (TBT) treatment. The results supported the involvement of steroid, neuroendocrine peptide hormone dysfunction and retinoid mechanisms, but suggested additionally the involvement of putative peroxisome proliferator–activated receptor (PPAR) pathways. Application of rosiglitazone, a well-known vertebrate PPARγ ligand, to dogwhelks induced imposex in the absence of TBT. Thus, while TBT-induced imposex is linked to the induction of many genes and has a complex phenotype, it is likely also to be driven by PPAR-responsive pathways, hitherto not described in invertebrates. Our findings provide further evidence for a common signalling pathway between invertebrate and vertebrate species that has previously been overlooked in the study of endocrine disruption.
Data from: Effects of fleas on nest success of Arctic barnacle geese: experimentally testing the mechanism
Parasites have detrimental effects on their hosts' fitness. Therefore, behavioural adaptations have evolved to avoid parasites or, when an individual is already in contact with a parasite, prevent or minimize infections. Such anti-parasite behaviours can be very effective, but can also be costly for the host. Specifically, ectoparasites can elicit strong host anti-parasite behaviours and interactions between fleas (Siphonaptera) and their hosts are one of the best studied. In altricial bird species, nest fleas can negatively affect both parent and offspring fitness components. However, knowledge on the effects of fleas on precocial bird species is scarce. Research on geese in the Canadian Arctic indicated that fleas have a negative impact on reproductive success. One possible hypothesis is that fleas may affect female incubation behaviour. Breeding females with many fleas in their nest may increase the frequency and/or duration of incubation breaks and could even totally desert their nest. The aim of our study was to 1) determine if a similar negative relationship existed between flea abundance and reproductive success in our study colony of Arctic breeding barnacle geese Branta leucopsis and 2) experimentally quantify if such effects could be explained by a negative effect of nest fleas on female behaviour. We compared host anti-parasite and incubation behaviour between experimentally flea-reduced and control nests using wildlife cameras and temperature loggers. We found that flea abundance was negatively associated with hatching success. We found little experimental support, however, for changes in behaviour of the breeding female as a possible mechanism to explain this effect.
Mechanical test on different elastomer materials based on the ASTM D412-16 standard
<p><strong>Aim: </strong>The main goal of conducting the mechanical tensile tests was to produce non-linear stress-strain curves for input data in the Ansys Workbench software. These curves played an important role in the accurate analysis of the mechanical behavior of the Finite Element Model (FEM) of the Hybrid III 5% Female ATD lumbar spine prototype. In addition, these curves evaluated the suitability of elastomer materials for manufacturing the lumbar spine prototype.</p> <p><strong>Method:</strong> Fourty-five Mechanical tensile tests were performed on five different elastomer materials (NR60, EPDM60, NEO60, CCP60, and CCP80) based on the ASTM D412-16 standard at three different strain rates including the standard strain rate (0.32 or =8mm/s), moderate strain rate (0.64 or =16mm/s), and high strain rate (4 or =100mm/s). Samples with standard and moderate strain rates were taken to failure using the MTS Insight 2 tensile testing machine. However, samples were not taken to failure in high strain rate testing due to the limited crosshead displacement (100mm) of the tensile testing machine (MTS 858 Bionix). </p> <p><strong>Result: </strong>The EPDM60 material with a tensile strength of 9.6 MPa demonstrated minimal Strain Rate Sensitivity (SRS =-0.06) up to 100% strain. The NR60 and CCP80 materials had greater tensile strength (18.5 MPa and 14.8 MPa) than EPDM60, but medium strain rate sensitivity (SRS -0.11 and -0.15). The CCP60 and NEO60 materials had lower tensile strength (5.3 MPa and 4.8 MPa) than EPDM60, but the medium (SRS =-0.12) and maximal strain rate sensitivity (SRS=-0.3), respectively.</p> <p><strong>Conclusion:</strong> The EPDM60 and NR60 materials appeared to be suitable for manufacturing the lumbar spine prototype, as EPDM60 exhibits minimal SRS, whereas NR60, despite a slight difference with a minimal range of SRS, showed maximal strength. Results of the FEM analysis showed that the lumbar spine prototype by using NR60 performs better than EPDM60. Therefore, NR60 as a suitable material was selected for manufacturing the lumbar spine prototype.</p>
Mechanical_Test_Tensile
<p>SmartFan Project public data</p>
Mechanical_Test_Mode I
<p>SmartFan Project public data</p>
Mechanical_Test_ILSS
<p>SmartFan Project public data</p>
Mechanical_Test_DCB
<p>SmartFan Project public data</p>
Hemodynamic data from the Inspired Therapeutics NeoMate Mechanical Circulatory Support System for neonates and infants as tested in static mock circulatory loops, dynamic mock circulatory loops, and acute animal studies
<p>Inspired Therapeutics (Merritt Island, FL) is developing a mechanical circulatory support (MCS) system designed as a single driver with interchangeable, extracorporeal, magnetically levitated pumps. The NeoMate system design features an integrated centrifugal rotary pump, motor, and controller that will be housed in a single compact unit. Conceptually, the primary innovation of this technology will be the combination of disposable, low-cost pumps for use with a single, multi-functional, universal controller to support multiple pediatric cardiopulmonary indications. In response to the paucity of clinically available pediatric devices, Inspired Therapeutics is specifically targeting the underserved neonate and infant heart failure (HF) patient population first. In this article, we present the development of the prototype Inspired Therapeutics NeoMate System for pediatric left ventricular assist device (LVAD) support, and feasibility testing in static mock flow loops (H-Q curves), dynamic mock flow loops (hemodynamics), and in an acute healthy ovine model (hemodynamics and clinical applicability). The resultant hydrodynamic and hemodynamic data demonstrated the ability of this prototype pediatric LVAD and universal controller to function over a range of rotary pump speeds (500-6000 RPM), to provide pump flow rates of up to 2.6 L/min, and to volume unload the left ventricle in acute animals. Key engineering challenges observed and proposed solutions for the next design iteration are also presented.</p>
Repository for the codes and raw dataset used in the paper: Testing driving mechanisms of megathrust seismicity with Explainable Artificial Intelligence.
<p>This repository contains the codes/notebooks and raw dataset used in the paper:</p> <p>Testing driving mechanisms of megathrust seismicity with Explainable Artificial Intelligence. by Juan Carlos Graciosa, Fabio A. Capitanio, Adam Beall, Mitchell Hargreaves, Thyagarajulu Gollapalli, Titus Tang, Mohd Zuhair</p> <h3>xai-megathrust:</h3> <p>This directory contains the following:</p> <p>1. helper_pkg: Package containing helper routines used during the creation of grids.<br>2. in-data: Contains the processed but non-standardized features. Standardization is done during runtime.<br>3. ml4szeq: Main set of codes used in the study.<br>4. ntbk: Notebooks used in the study. This includes the sampling of the raw data into grids (0_grid_sampling.ipynb), creation of classification maps (1_make_classification_maps.ipynb), and the creation of LRP heatmaps (2_make_lrp_heatmaps.ipynb).<br>5. vis_pkg: Package used for creating maps</p> <p> </p> <h3>xai-megathrust-raw-data:</h3> <p>This contains the raw dataset. Here, the data prefix indicates the convergent region it is a part of and are as follows:</p> <p>1. alu: Alaska-Aleutians<br>2. cam: Central America<br>3. izu: Izu-Bonin-Mariana<br>4. ker: Tonga-Kermadec<br>5. kur: Japan-Kuriles-Kamchatka<br>6. ryu: Ryukyu-Nankai<br>7. sam: South America<br>8. sum: Southeast Asia </p> <p>This was adapted from the notation used by Hayes et al., 2018.</p>
Data from: Testing potential mechanisms of conspecific sperm precedence in Drosophila pseudoobscura
<p><i>Drosophila pseudoobscura</i> females that co-occur with sister species <i>D. persimilis</i> show elevated fertilization by conspecific sperm when they mate with both a heterospecific and a conspecific male. This phenomenon, known as conspecific sperm precedence (CSP), has evolved as a mechanism to avoid maladaptive hybridization with <i>D. persimilis</i>. In this study, we assessed pericopulatory (during mating) and postcopulatory (after mating) traits in crosses with sympatric or allopatric <i>D. pseudoobscura </i>females and conspecific or heterospecific males to evaluate potential mechanisms of CSP in this system. We observed shorter copulation duration in crosses with sympatric females, but found no difference in quantity of sperm transferred or female reproductive tract toxicity between sympatry and allopatry. Our data show some support for the hypothesis that parasperm, a short, sterile sperm morph, can protect fertile eusperm from the <i>D. pseudoobscura </i>female reproductive tract, though it is unclear how this might affect patterns of sperm use in sympatry vs. allopatry. Overall, these results suggest that copulation duration could potentially contribute to the elevated CSP observed in sympatry.</p>
Comparison of Two Tests in the Assessment of the Accuracy of Esophageal Pressure Variations Measurement During Mechanical Ventilation
ClinicalTrials.gov study NCT02036788. IPD Sharing: Not stated. Countries: 1. Publications: 5.
Visual Sputum Suctioning System Tests in Mechanically Ventilated Patients
ClinicalTrials.gov study NCT02116491. IPD Sharing: Not stated. Countries: 1. Publications: 6.
A Modified Cuff Leak Test and Reintubation in Mechanically Ventilated Patients
ClinicalTrials.gov study NCT05550220. IPD Sharing: Not stated. Countries: 1. Publications: 1.
HIV Results Exchange Mechanism on Promoting HIV Testing Among MSM
ClinicalTrials.gov study NCT03984136. IPD Sharing: YES. Countries: 1. Publications: 2.
Effectiveness of Scapula Mobilization on Mechanosensitivity of Upper Limb Neural Test 1 in Mechanical Neck Pain
ClinicalTrials.gov study NCT04168476. IPD Sharing: NO. Countries: 1. Publications: 0.
Cuff Leak Test and Airway Obstruction in Mechanically Ventilated ICU
ClinicalTrials.gov study NCT03372707. IPD Sharing: NO. Countries: 3. Publications: 24.
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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.