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424 results for “drift”
Drift of Pt-Rh thermocouples in emf and in temperature terms at 1324 °C
<p>Dataset containing drift of selected Pt-Rh thermocouples which are part of a multi-wire thermocouple. Drift is in emf terms and in temperature terms. Drift was measured by exposing the thermocouples to a temperature of approximately 1324 °C, with periodic in-situ calibration using a Co-C 'fixed-point' point cell (melting point 1324.29 °C).</p>
Aerial images of sea ice during the Oden_AO2018 campaign (Arctic Ocean 2018: MOCCHA - ACAS - ICE) Central Arctic / North Pole drift station in 2018 on IB ODEN
<p>35 oblique aerial images of sea ice (.jpg) were obtained during helicopter and drone flights during the Oden_AO2018 campaign (Arctic Ocean 2018: MOCCHA - ACAS - ICE) Central Arctic / North Pole drift station in 2018 on IB ODEN. The images display the drifting, melt-pond covered multi-year ice (MYI) floe close to the geographic North Pole in autumn 2018 on which the IB ODEN was anchored to. The images were taken on 14, 16, 28 August and 13 September. The images document the evolution of melt ponds between their fully developed stage in late summer towards their autumn characteristics with a refrozen surface and finally a snow cover.</p> <p>For details, please see the respective publication Anhaus, P., Katlein, C., Nicolaus, M., Hoppmann, M., and Haas, C.: From Bright Windows to Dark Spots: The Evolution of Melt Pond Optical Properties during Refreezing. Currently under review in Geophysical Research Letters. Preprint available <a href="https://doi.org/10.1002/essoar.10507628.1">doi:10.1002/essoar.10507628.1</a></p> <p>For the cruise report, please see Leck, C., Matrai, P. A., Perttu, A.-M., and Gårdfeldt, K. (2019): Expedition report: SWEDARTIC Arctic Ocean 2018. Luleå: Swedish Polar Research Secretariat. <a href="https://nbn-resolving.org/urn:nbn:se:polar:diva-8405">urn:nbn:se:polar:diva-8405</a></p>
Video from: Two-dimensional hybrid model of gradient drift instability and enhanced electron transport in a Hall thruster
<p>The video data for Fig. 3 in "Two-dimensional hybrid model of gradient drift instability and enhanced electron transport in a Hall thruster."</p>
Complex patterns shape immune genes diversity during invasion of common raccoon in Europe – selection in action despite genetic drift
<p>Rapid adaptation is common in invasive populations and is crucial to their long-term success. The primary target of selection in the invasive species' new range is standing genetic variation. Therefore, genetic drift and natural selection acting on existing variation are key evolutionary processes through which invaders will evolve over a short timescale. In this study, we used the case of the raccoon <em>Procyon</em> <em>lotor</em> invasion in Europe to identify the forces shaping the diversity of immune genes during invasion. The genes involved in the defence against infection should be under intense selection pressure in the invasive range where novel pathogens are expected to occur. To disentangle the selective and demographic processes shaping the adaptive immune diversity of its invasive and expanding populations, we have developed species-specific SNP markers located in the coding regions of targeted immune-related genes. We characterised the genetic diversity of 110 functionally important immune genes in two invasive and one native raccoon genetic clusters, each presenting a different demographic history. Despite the strong effect of demographic processes in the invasive clusters, we detected a subset of genes exhibiting the diversity pattern suggestive of selection. The most likely process shaping the variation in those genes was balancing selection. The selected genes belong to toll-like receptors and cytokine-related genes. Our results suggest that the prevalence of selection depends on the level of diversity, i.e. – less genetically diverse invasive population from Czech Republic displayed fewer signs of selection. Our results highlight the role of standing genetic variation in adapting to a new environment. Understanding the evolutionary mechanisms behind invasion success would enable predicting how populations may respond to environmental change.</p>
Dataset related to the publication "Ability of gas modulation to reduce the pickup of drifts in refractometry"
<p>The data set consists of; The published paper, all figures that present measurement or simulation data in .png and .fig format and the underlying data plotted in the figures in text format. The published plots were generated from the fig files. The text files were generated by reading the plotted data from the fig files. The files are named Fig_XX were XX corresponds to the figure number in the publication. The format of the text file is as follows. Before every data set there is a header consisting of; The number of the subplot where the data is plotted (Plot: XX), the number of the data set in the sub plot (DataSet: XX), and the color of the line or marker in the plot (Color: XX). The description of what each color represents can be found in the publication.</p>
Modeled wintertime sea ice drift, sea ice thickness, dynamic sea surface height and sea ice drift budget terms in the Arctic
<p>Modeled wintertime sea ice drift, sea ice thickness, dynamic sea surface height and sea ice drift budget terms in the Arctic between 1981 and 2020.</p>
Preliminary data of drifting snow mass flux from the lower SPC at MOSAiC (2020-01-26 to 2020-02-04) for the submitted paper "Towards a fully physical representation of snow on Arctic sea ice using a 3D snow-atmosphere model"
<p>Preliminary data of lower SPC massflux from MOSAiC, for the time period 2020-01-26 -- 2020-02-04.</p> <p>1-h averaged time series of mass flux (kg/m²/h) to compare with the ALPINE3D simulation results.</p> <p>Will soon be replaced with a DOI / Repositiry at the Arctic Data Centre from BAS.</p>
Reformado catalítico de alquitrán proveniente de la gasificación de biomasa con fines energéticos: Estudios DRIFT in-situ
<p>La gasificación es un método termoquímico empleado para la transformación de materiales en compuestos gaseosos con un poder calorífico moderado, el cual puede emplearse para la generación de energía (Garcia Peña et al., 2022). Esta tecnología está adquiriendo un gran interés académico e industrial debido a los beneficios ambientales. En el proceso de gasificación se genera una corriente gaseosa (H2, CO, CO2 y CH4) y compuestos de alquitrán, estos últimos pueden generar baja calidad del gas y problemas operativos en su aplicación (Akbarian et al., 2022). Por lo que la reducción/eliminación del alquitrán de la fase gaseosa es uno de los principales desafíos para el éxito de esta tecnología y su posible aplicación industrial. El reformado catalítico permite la eliminación de alquitrán, presentado ventajas al lograr altas eficiencias, dependiendo de variables como tipo de catalizador, tiempo de residencia y temperatura (Galadima, Masudi, & Muraza, 2022). Este método se considera el más prometedor en aplicaciones a gran escala de la tecnología de gasificación. En este trabajo, inicialmente se estudió el proceso de reformado catalítico a escala laboratorio empleando una cámara DRIFT (Espectroscopia Infrarroja con Reflectancia Difusa) con control de temperatura, presión y flujo de gases. En la cámara se evaluaron 4 catalizadores: Fe/CA catalizador de bajo costo, dolomita (Dol), NiMo soportado en alúmina catalizador descartado de una unidad de hidrodesulfuración (HDS) y residuo de pirolisis (RP) solido obtenido de un proceso de pirólisis (char). Mediante DRIFT in-situ se realizó la adsorción y el seguimiento del reformado de compuestos modelos como tolueno y gas de síntesis con el objetivo de observar intermediarios e interacciones del proceso y posibles reacciones de reformado (Cordoba et al., 2022). Posteriormente, los catalizadores fueron evaluados en el proceso de reformado catalítico acoplado a un sistema de gasificación de residuos biomásicos a escala banco. En este sistema se buscó obtener un gas óptimo para aplicaciones energéticas (Garcia et al., 2022). Para tal fin, se evaluó la gasificacion en modo autotérmico y fluidizado de aserrín de pino con una alimentación de 0.840 kg/h y aguas abajo en el reactor de reformado los 4 catalizadores estudiados a 600°C con un WHSV: 6 h-1. Los resultados del trabajo permitieron identificar especies superficiales, posibles reacciones y el desempeño de los catalizadores durante reformado catalítico mediante los experimentos de DRIFT in-situ. Además, en el proceso de gasificación a escala banco, se observó que todos los catalizadores evaluados en el reactor de reformado aguas abajo presentan una buena actividad catalítica, obteniéndose reducciones de alquitrán > 60%. Los catalizadores en el reformado aumentaron los valores de poder calorífico inferior (LHV) y relación H2/CO, además se obtuvieron diferentes proporciones de H2, CO, CH4 y CO2 que concuerdan con las reacciones y mecanismos evidenciados en los experimentos DRIFT in-situ. Se puede concluir que el reformado catalítico aguas abajo del gasificador mejora la calidad del gas, el cual tiene un potencial para aplicaciones energéticas. Por otro lado, los catalizadores empleados son promisorios ya que son atractivos desde el punto de vista ambiental y económico.</p>
EEG Dataset and Processing script Associated with the Manuscript, "Using the Time-varying Drift Rate, the Signal Suppression and the Utility Maximisation to Account for Road Crossing Decisions".
<p>The repository archived the behavioural data (zip files) associated with the EEG experiment and the MATLAB script for EEG processing. BDFs stored the down-sampled EEG. </p>
Reference genome resources associated with the project: Functional genetic diversity is correlated with intensity of genetic drift in populations of an endangered rattlesnake
<p class="MsoNormal">Theory predicts that genetic erosion in small, isolated populations of endangered species can be assessed using estimates of neutral genetic variation reflecting long-term impacts of genetic drift, yet this widely used approach has been questioned in the genomics era. Here we leverage a chromosome-level assembly and whole genome resequencing data (N=110 individuals) from an endangered rattlesnake (<em>Sistrurus catenatus</em>) to evaluate the relationship between genome-wide neutral and functional diversity over long- and short-term timescales. As predicted for populations at long-term equilibrium, we found a positive correlation between population-level estimates of neutral genetic diversity (π) and the mean number of highly detrimental loss-of-function mutations, and a negative relationship between neutral genetic diversity and an estimate of genetic load. In contrast, we found only a weak, non-significant positive correlation between levels of neutral and adaptive variation. Additional analyses using estimates of drift at more recent time scales (> 100 generations) show expected correlations between both measures of genetic load, but a lack of a significant correlation with levels of adaptive variation. Individual-based demographic metrics that capture drift impacts over recent time scales confirm these results. Broadly, our results confirm that estimates of diversity and demography based on neutral genetic variation provide an accurate measure of a key component of genetic erosion – genetic load – in populations of a threatened vertebrate. Our findings also provide nuance to the neutral-functional diversity controversy by demonstrating that neutral genetic diversity is useful in predicting some, but not all, components of functional genetic diversity.</p>
Data from: Do chromosome rearrangements fix by genetic drift or natural selection? Insights from Brenthis butterflies
<p>Large-scale chromosome rearrangements, such as fissions and fusions, are a common feature of eukaryote evolution. They can have considerable influence on the evolution of populations, yet it remains unclear exactly how rearrangements become established and eventually fix. Rearrangements could fix by genetic drift if they are weakly deleterious or neutral, or they may instead be favoured by positive natural selection. Here we compare genome assemblies of three closely related <em>Brenthis</em> butterfly species and characterise a complex history of fission and fusion rearrangements. An inferred demographic history of these species suggests that rearrangements became fixed in populations with large long-term effective size (<em>N<sub>e</sub></em>). However, we also find large runs of homozygosity within individual genomes and show that a model of population structure with smaller local <em>N<sub>e</sub></em> can reconcile these observations. Using a recently developed analytic framework for characterising hard selective sweeps, we find that chromosome fusions are not enriched for evidence of past sweeps compared to other regions of the genome. Nonetheless, one chromosome fusion in the <em>B. daphne</em> genome is associated with a valley of diversity where genealogical branch lengths are distorted, consistent with a selective sweep. Our results suggest that drift is a stronger force in these populations than suggested by overall genetic diversity, but that the fixation of strongly underdominant rearrangements remains unlikely. Additionally, although chromosome fusions do not typically exhibit signatures of selective sweeps, a single example raises the possibility that natural selection may sometimes play a role in their fixation.</p>
Simulation Data for Electron Scattering due to Asymmetric Drift-Orbit Bifurcation: Geometric Jumps of Adiabatic Invariant
<p>Simulation dataset for the paper “Electron Scattering due to Asymmetric Drift-Orbit Bifurcation: Geometric Jumps of Adiabatic Invariant.” The archive “artemis_solar_dataset.zip” contains the solar wind magnetic field data used to plot Figure 1. The three “…_jump.txt” files are tracing data used to plot Figures 6a, 6b, and 6c, while “test_particle.txt” is the tracing data for Figure 5. The file “t04_L_shells__Pd_4.00_B_5.00_theta_225.txt” provides magnetic field B(s, MLT) profiles at different L-shells (used to plot Figure 7); each line corresponds to a specific MLT sector at one specific L-shell.</p>
Evidence that genetic drift not adaptation drives fast-Z and large-Z effects in Ficedula flycatchers
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Genetic drift does not sufficiently explain patterns of electric signal variation among populations of the mormyrid electric fish Paramormyrops kingsleyae
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Data for: The hippocampal representation of context is preserved despite neural drift
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Data from: the Self-Calibrating Tilt Accelerometer: a method for observing tilt and correcting drift with a triaxial accelerometer
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Complex patterns shape immune genes diversity during invasion of common raccoon in Europe – selection in action despite genetic drift
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Young frigatebirds learn how to compensate for wind-drift
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Data from: Divergent selection and drift shape the genomes of two avian sister species spanning a saline-freshwater ecotone
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Rapid morphological divergence following a human-mediated introduction: The role of drift and directional selection
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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)
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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.