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12 results for “migration barrier”
Data for the publication "MgB2Se4 Spinels (B = Sc, Y, Er, Tm) as Potential Mg-Ion Solid Electrolytes – Partial Ionic Conductivity and the Ion Migration Barrier"
<h1><strong>Description Datasets</strong></h1> <p>Datasets are obtained from X-ray diffraction (XRD), Rietveld analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) spectroscopy, electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), chronopotentiometry (CP) and linear sweep voltammetry (LSV).</p> <h1><strong>Abstract</strong></h1> <p>The magnesium chalcogenide spinel MgSc~2~Se~4~ with high Mg-ion room-temperature conductivity has recently attracted interest as solid electrolyte for magnesium ion batteries. Its ionic/electronic mixed-conducting nature and the influence of the spinel composition on the conductivity and Mg^2+^ migration barrier are yet not well understood. Here, results from a combined experimental and computational study on four MgB~2~Se~4~ spinels (B = Sc, Y, Er, Tm) are presented. The room-temperature ionic conductivities (<em>σ</em>~ion~ = 2x10^–5^–7x10^–5^ S cm^–1^) of the spinels are accurately measured, as electron transport is effectively suppressed by purely Mg-ion conducting electrode interlayers. Using the same approach, reversible Mg plating/stripping as well as good electrochemical stability are achieved. Driven by the good accordance of the computationally and experimentally obtained Mg^2+^ migration barriers <em>E</em>~a~(th) and <em>E</em>~a~, respectively, further periodic density functional calculations are performed on the MgB~2~Se~4~ spinel system, revealing the role of trigonal distortion on the migration path geometry and <em>E</em>~a~(th). These findings provide deeper understanding how to reach small Mg^2+^ migration barriers <em>E</em>~a~ in the MgB~2~Se~4~ spinels.</p>
Simulation data of barrier migration behavior and morphology from Barrier3D
Barrier3D (version 1.0) simulation results of barrier migration behavior and morphology across a range of input conditions. Simulations vary by average number of storms per year (4-12), characteristic dune growth rate (0.3-0.9 yr^-1), relative sea-level rise rate (2-8 mm/yr), level of storminess (low-high), and shoreface response rate (1,000-10,000 m^3/m/yr). Each row in the spreadsheet represents a unique model simulation; to account for storm stochasticity in the model, each unique combination of parameter values was simulated 100 times. Simulations run for 1,000 model years or until the barrier drowns. Punctuated retreat is determined to occur if the simulation includes two or more alternating periods of both transgression and relative immobility. Periods of immobility (transgression) are defined as 30 years or more of shoreline change rates (SCR) under (over) 0.5 m/yr. To test the sensitivity of these values, the statistics for punctuated retreat are calculated (for a subset of the simulations) using higher and lower duration (20-40 yrs) and SCR (0.25-0.75 m/yr) thresholds.
Data for: Barriers to seedling establishment in grasslands: Implications for Nothofagus forest restoration and migration
<p>Tree seedling establishment outside forest boundaries is controlled by many interacting factors. Understanding the relative importance of different pressures is essential for improving techniques for forest restoration and for understanding the potential of forest boundaries to shift and adapt to changing climate conditions. We investigated constraints on the spread of a key southern hemisphere forest type into grasslands by undertaking a multi-factorial experiment sowing <em>Nothofagus cliffortioides</em> (Nothofagaceae) in a historically deforested retired pasture. We manipulated factors to determine the relative effects of sheltered microsites, competition with pasture species, availability of ectomycorrhizal fungi, soil nutrients, and rabbit herbivory, on seedling emergence and survival. Overall survival was low (11.7% after six months and 1.5% after ten months), but there were strong treatment effects on both seedling establishment and survival. The availability of shelter and competition with pasture species had strongest effects, with the presence of pasture species initially aiding seedling emergence due to a sheltering effect, but negatively affecting survival at later stages. Most remaining seedlings at the conclusion of the experiment had formed ectomycorrhizae regardless of whether inoculum was supplied, and seedling survival and health was positively related to ectomycorrhizal colonization. Fertilizing had less of an effect than other factors, and results regarding rabbit herbivory were inconclusive. Synthesis and applications: This study provides new insights into how factors interact to limit tree seedling establishment in grasslands and forest expansion into neighboring ecosystems. This improves understanding of the ability of an ectomycorrhizal keystone forest species to migrate and adapt to climate change. This study also assists restoration practitioners in selecting techniques that will enhance seedling establishment, and highlights that direct seeding approaches in open grasslands are unlikely to result in high rates of <em>Nothofagus </em>establishment.</p>
Data for: Barriers to seedling establishment in grasslands: Implications for Nothofagus forest restoration and migration
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Data from: Tracking migration of black-headed buntings Emberiza melanocephala reveals the Iranian Plateau as an ecological barrier along the Indo-European flyway
<p><strong>Abstract</strong></p> <p>The black-headed bunting is one of the few species that migrate along the Indo- European flyway, and its migration routes and phenology are poorly understood. We provide the first individual-based year-round tracking study describing route choice and timing of black-headed buntings migrating from a breeding site in Croatia to a 6000 km distant non-breeding region in Maharashtra, Central India. To evaluate landscapes important for the black-headed bunting migration, we quantified land covers and climates along the migration corridor. Stopover areas during the post-breeding migration were concentrated in four distinct regions: the Balkan Peninsula, central Anatolia, along with the Zagros Mountain range and from the Indus River delta to the Kathiawar Peninsula. Post-breeding migration routes followed the shortest path connecting breeding and non-breeding sites, except for the initial detour from the breeding sites to the first stopovers at the Balkan Peninsula. The pre-breeding migration routes occur along the Arabian Peninsula, about 1000 km south of the post-breeding routes – creating a clockwise loop migration pattern. Post-breeding migration lasted about two months, whereas pre-breeding migration was almost two times shorter, conforming to energy- and time-minimisation strategies, respectively. During the postbreeding migration, birds seem to track ecological niches found on their breeding grounds. Post-breeding stopover areas were rich in mosaic lands and were in warm and dry climates of Mediterranean character, while forests and bare areas, as well as arid and humid climates, were avoided.</p> <p> </p>
Data and code from: Bioacoustic monitoring reveals patterns of landscape use by migrating birds at a Great Lakes barrier crossing
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A tale of two conifers: Migration across a dispersal barrier outpaced regional expansion from refugia
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Data from: Keeping things local: subpopulation Nb and Ne in a stream network with partial barriers to fish migration
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Data from: Migration highways and migration barriers created by host-parasite interactions
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The Caucasus as an asymmetric semipermeable barrier to ancient human migrations
GEO Series GSE37342. Homo sapiens. 204 samples. Type: Genome variation profiling by SNP array; SNP genotyping by SNP array.
The pH-sensing receptor OGR1 improves barrier function of CaCo-2 cells and inhibits migration in an acidic environment
GEO Series GSE60294. Homo sapiens. 12 samples. Type: Expression profiling by array.
Data for: Individual variation in the habitat selection of upstream migrating fish near a barrier
<p>Telemetry tracks and associated environmental data for tagged barbel (<i>Barbus barbus</i>) and grayling (<i>Thymallus thymallus</i>) during their upstream migration.</p>
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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.
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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.