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111 results for “flow dynamics”
Data from: Linking beaver dam affected flow dynamics to upstream passage of Arctic grayling
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Elastic energy storage in seahorses leads to a unique suction flow dynamics compared to other actinopterygian
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Spatio-temporal dynamics of impulse responses to figure motion in optic flow neurons
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Data from: Flow heterogeneity controls dissolution dynamics in topologically complex rocks
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Supplementary videos for "The mechanical origin of snow avalanche dynamics and flow regime transitions"
<p>We are releasing the videos as the supplementary information for our submitted manuscript to The Cryosphere. </p> <p>Movie 1. Velocity of the flows in the four typical flow regimes in Fig. 2(a). Frame rate is 24 FPS.</p> <p>Movie 2. Volumetric plastic strain of the flows in the four typical flow regimes in Fig. 2(a). Frame rate is 24 FPS.</p> <p>Movie 3. Velocity of the flow in transition from cold dense to warm shear regimes in Fig. 2(b). Frame rate is 24 FPS.</p> <p>Movie 4. Volumetric plastic strain of the flow in transition from cold dense to warm shear regimes in Fig. 2(b). Frame rate is 24 FPS.</p>
Effect of space diffuser on flow characteristics of a centrifugal pump by computational fluid dynamic analysis
<p><span>Achieving an optimal configuration of the diffuser is indispensable for high pump performances. In this work, a numerical study on diffuser configuration is conducted for a high pump performance using a computational fluid dynamics code, and the effects of the wrap angle and the relative position of the diffuser vane to the impeller on pump performances are included. The results indicate that the modified diffuser with a suitable wrap angle may improve the pump hydraulic efficiency and the head by approximately 4% and 8%, respectively, while a suitable position of the diffuser vane can enhance the pump head by more than 4%. Meanwhile, the pressure recovery coefficient and the local Euler head of the diffuser are adopted to evaluate the diffuser performance. For a high pump performance, the local Euler head of the diffuser has a peak value at the leading edge with the change rate of zero along the meridian streamline, meaning that no blade loading at the leading edge of the diffuser guarantees a better match between the impeller and the diffuser.</span></p>
Data from: The relevance of gene flow in metapopulation dynamics of an oceanic island endemic, Olea europaea subsp guanchica
Theoretical and empirical studies suggest that geographical isolation and extinction-recolonization dynamics are two factors causing strong genetic structure in metapopulations. Here, we investigated the effect of population age structure and isolation by distance in the patterns of genetic diversity in a tree species (Olea europaea subsp. guanchica) sporadically affected by volcanic events across the Canarian archipelago. Genetic variation was assessed at six nuclear microsatellites (nDNA) and six chloroplast fragments (cpDNA) in nine subpopulations sampled on four oceanic islands. Subpopulations occurring on more recent substrates were more differentiated than those on older substrates, but within-subpopulation genetic diversity was not significantly different between age groups for any type of marker. Contrary to the general trend for island systems, between-island differentiation was extremely low, and lower than differentiation between subpopulations on the same island. The pollen-to-seed ratio was close to one, two orders of magnitude lower than the average estimated for other wind-pollinated, animal-dispersed plants. Our results showed that population turnover and geographical isolation increased genetic differentiation relative to an island model at equilibrium, but overall genetic structure was unexpectedly weak for a species distributed among islands. This empirical study shows that extensive gene flow, particularly mediated by seeds, can ameliorate population subdivision resulting from extinction-recolonization dynamics and isolation by distance
Fitacf data for "Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure"
<p>This is the SuperDARN dataset in fitacf format (2.5) from the Hankasalmi radar. The data is used in the publication: Jin, Y., Moen, J. I., Spicher, A., Liu, J., Clausen, L. B. N., & Miloch, W. J. (2023). Ionospheric flow vortex induced by the sudden decrease in the solar wind dynamic pressure. Journal of Geophysical Research: Space Physics, 128, e2023JA031690. https://doi.org/10.1029/2023JA031690</p>
Integrated Modeling of Flow, Soil Erosion, and Nutrient Dynamics in a Regional Watershed: Assessing Natural and Human-Induced Impacts
<p>Attached file is the verification data for the submitted manuscript "Integrated Modeling of Flow, Soil Erosion, and Nutrient Dynamics in a Regional Watershed: Assessing Natural and Human-Induced Impacts" .</p>
Experimental Data for Dynamic Flow Reactions of 1,2,4-Triazole with Acrylonitrile
<p>The reaction input flow rates, temperatures and concentrations are provided for time intervals of roughly 12 s. At each of these points, the concentration of four species was measured by online benchtop NMR analysis and these concentrations are provided.</p> <p>Experiments 1-7 and the self-optimization data are detailed in the manuscript (part 1).</p>
Experimental investigation on dynamics and flow resistance of granular-fluid flows
<p><span>Dataset related to the manuscript “Experimental investigation on dynamics and flow resistance of granular-fluid flows”, submitted to the </span><em><span>Journal of Geophysical Research: Earth Surface</span></em><span>.</span></p>
Data from: Current geography masks dynamic history of gene flow during speciation in northern Australian birds
Genome divergence is greatly influenced by gene flow during early stages of speciation. As populations differentiate, geographical barriers can constrain gene flow and so affect the dynamics of divergence and speciation. Current geography, specifically disjunction and continuity of ranges, is often used to predict the historical gene flow during the divergence process. We test this prediction in eight meliphagoid bird species complexes codistributed in four regions. These regions are separated by known biogeographic barriers across northern Australia and Papua New Guinea. We find that bird populations currently separated by terrestrial habitat barriers within Australia and marine barriers between Australia and Papua New Guinea have a range of divergence levels and probability of gene flow not associated with current range connectivity. Instead, geographic distance and historical range connectivity better predict divergence and probability of gene flow. In this dynamic environmental context, we also find support for a nonlinear decrease of the probability of gene flow during the divergence process. The probability of gene flow initially decreases gradually after a certain level of divergence is reached. Its decrease then accelerates until the probability is close to zero. This implies that although geographic connectivity may have more of an effect early in speciation, other factors associated with higher divergence may play a more important role in influencing gene flow midway through and later in speciation. Current geographic connectivity may then mislead inferences regarding potential for gene flow during speciation under a complex and dynamic history of geographic and reproductive isolation.
Data From: Active sinking particles: Flow and transport dynamics due to sessile suspension feeders on sinking aggregates
<p>Sinking or sedimentation of biological aggregates plays a critical role in carbon sequestration in the ocean and in vertical material fluxes in waste-water treatment plants. In both these contexts, the sinking aggregates are "active," since they are biological hot-spots and are densely colonized by microorganisms including bacteria and sessile protists, some of which generate feeding currents. However, the effect of these feeding currents on the sinking rates, trajectories, and mass transfer to these "active sinking particles," has not previously been studied. Here we use a novel scale-free vertical-tracking microscope (a.k.a. Gravity Machine, Krishnamurthy et al. "Scale-free vertical tracking microscopy." Nature Methods (2020)) to follow model sinking aggregates (agar spheres) with attached protists (<em>Vorticella convallaria</em>), sinking over long distances while simultaneously measuring local flows. We find that activity due to attached \vortc causes significant changes to the flow around aggregates in a dynamic manner and reshapes mass transport boundary layers. Furthermore, we find that activity-mediated local flows along with sinking modify the encounter and plume cross-sections of the aggregate and induce sustained aggregate rotations. Overall our work shows the important role of biological activity in shaping the near-field flows around aggregates with potentially important effects on aggregate fate and material fluxes.</p>
Data for Sleep cycle-dependent vascular dynamics and the predicted effects on perivascular cerebrospinal fluid flow and solute transport
<p>Datasets containing derived data and results used by code in: https://github.com/AlexandraVallet/PVSflow for "Sleep cycle-dependent vascular dynamics and the predicted effects on perivascular cerebrospinal fluid flow and solute transport", Bojarskaite et al. 2023. Please see github for instructions. </p>
Respiration and CO2 evasion dynamics in moving streambeds as a response to flow regimes
<p>This dataset contains both raw and processed data utilized in generating the findings outlined in our research paper titled "Respiration and CO2 Evasion Dynamics in Mobile Streambeds in Response to Different Flow Regimes," which has been submitted to the Journal of Hydrology. Additionally, within this dataset, you will find a collection of movies that are part of our Supporting Information.</p> <p>Within this dataset, you will find a sub-dataset for all nine experimental runs. These experimental runs encompass three distinct flow regimes: a constant flow regime (C), a sinusoidal flow regime (S), and a single peak flow event (F). Each of these flow regimes was conducted three times as repeated measurements (RM).</p> <p>The data subsets contain:</p> <ol> <li> <p>Raw infrared images captured at the sediment-water interface using an infrared camera.</p> </li> <li> <p>A selection of raw infrared images that correspond to the optode images obtained from our optode camera.</p> </li> <li> <p>Preprocessed optode images captured by the optode camera.</p> </li> <li> <p>The original raw planar optode images.</p> </li> <li> <p>A supplementary text file containing essential data information.</p> </li> </ol> <p>Furthermore, the dataset encompasses raw data files related to surface water chemistry data and measurements of CO<sub>2</sub> air concentration and pressure. Also it contains datafiles with all results used in the publication.</p> <p>In the Supporting Information folder, you will find Movies S1 through S18, which visually illustrate the sediment's movement and the dynamic variations in O<sub>2</sub> and CO<sub>2</sub> concentrations within the sediment.</p>
Quantification of Myocardial Blood Flow Using Dynamic PET/CTA Fused Imagery
ClinicalTrials.gov study NCT04221594. IPD Sharing: YES. Countries: 2. Publications: 1.
Assessing Lung Dynamics and Respiratory Functions in Minimal Flow Anesthesia: A Prospective Study
ClinicalTrials.gov study NCT06055335. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Integrated Diagnostics Characterization of Right Ventricular Diastolic Flow Dynamics in Pulmonary Arterial Hypertension
ClinicalTrials.gov study NCT01491646. IPD Sharing: Not stated. Countries: 1. Publications: 5.
Improvement Assessment of Coronary Flow Dysfunction Using Fundamental Fluid Dynamics
ClinicalTrials.gov study NCT01719016. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Integrated Computational modelIng of Right Heart Mechanics and Blood Flow Dynamics in Congenital Heart Disease
ClinicalTrials.gov study NCT03217240. IPD Sharing: UNDECIDED. Countries: 1. Publications: 15.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.