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53 results for “magnetic activity”
Magnetic Proxy for Solar Activity
<p>Proxies for solar activity are often used to extend solar irradiance measurements in time or forecast future variability. We calculate images of the solar photospheric magnetic field from a flux transport simulation and create a multicomponent proxy for solar activity.</p>
Suppression of Bend Instability in Microtubule-fd Virus Composite Active Nematics by External Magnetic Field
<p>The shear flow-aligned active nematic within a cuboidal channel is subjected to an external magnetic field (1.8T) in the aligned nematic direction. In the absence of the magnetic field, bend deformations proliferate, generating flows perpendicular to the initial alignment, as seen in the control case where no external field is applied (PIV vectors overlaid on the image for visual representation). Under the influence of the magnetic field, the bend instabilities are quelled, as there are no flows perpendicular to the applied field. Tracer beads are utilized for brightfield imaging in the magnetic field apparatus to distinguish between the conditions, while fluorescently labeled microtubules are observed in the control scenario.</p>
Suppression of Bend deformation in Active Nematics by Magnetic Field
<p>In the presence of an external magnetic field (1.8T) applied horizontally along the shear-aligned direction of the active nematic within a cuboidal channel, flows perpendicular to the field are hindered (time<6 min). This suppression arises because the active stress that distorts the nematic alignment encounters resistance from nematic elasticity and the externally applied magnetic field. When the magnetic field is switched off (time>6 min) (indicated by spikes in PIV vector magnitude due to sample holder movement), the nematic undergoes a bend deformation, initiating flows perpendicular to the field direction. This observation suggests that the magnetic field's influence lies in aligning the liquid crystal rather than disrupting the active stress through interference with motor proteins.</p>
ADAPT Global Solar Magnetic Maps - 2010 Sep 18-20 (w/ & w/o farside active region input)
<p>ADAPT (Air Force Data Assimilative Photospheric flux Transport) model global solar magnetic maps using HMI magnetograms with ("wfar") and without ("orig") estimated farside active region flux, for the 3 day period: September 18-20, 2010. The farside emergence of NOAA AR11109 (approximately on 18sep2010, based on STEREO observations of farside) is estimated by modeling the HMI vector observation on the east-limb (i.e., at a CMD of approximately -61.5 degrees) back ~6 days. </p>
PRB Exciton-activated effective phonon magnetic moment in monolayer MoS2
<p>Optical excitation of chiral phonons plays a vital role in studying the phonon-driven magnetic phenomena in solids. Transition metal dichalcogenides host chiral phonons at high symmetry points of the Brillouin zone, providing an ideal platform to explore the interplay between chiral phonons and valley degree of freedom. Here, we investigate the helicity-resolved magneto-Raman response of monolayer MoS2 and identify a doubly degenerate Brillouin-zone-center chiral phonon mode at ∼270cm−1. Our wavelength- and temperature-dependent measurements show that this chiral phonon is activated through the resonant excitation of 𝐴 exciton. Under an out-of-plane magnetic field, the chiral phonon exhibits giant Zeeman splitting, which corresponds to an effective magnetic moment of ∼2.5𝜇𝐵. Moreover, we carry out theoretical calculations based on the morphic effects in nonmagnetic crystals, which reproduce the linear Zeeman splitting and Raman cross section of the chiral phonon. Our study provides important insights into lifting the chiral phonon degeneracy in an achiral covalent material, paving a route to excite and control chiral phonons.</p>
On the Origin of Sub-subgiant Stars. II. Binary Mass Transfer, Envelope Stripping, and Magnetic Activity
<p>MESA inlists and run_star_extras associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2017ApJ...840...67L">Leiner et al. (2017)</a>. MESA version 7624.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/1538-4357/aa6aff">10.3847/1538-4357/aa6aff</a></p>
Test dataset for "Rapid estimation of cortical neuron activation thresholds by transcranial magnetic stimulation using convolutional neural networks"
<p>Data corresponding to test dataset used in Aberra AS, Lopez A, Grill WM, Peterchev AV. (2022). "Rapid estimation of cortical neuron activation thresholds by transcranial magnetic stimulation using convolutional neural networks". bioRxiv. Dataset includes:</p> <ul> <li><em>simnibs/ -</em> SimNIBS mesh and E-field solution file used in test dataset (posterior-anterior TMS of M1 in <em>ernie</em> example mesh, meshed with mri2mesh pipeline)</li> <li><em>layer_data/ - </em>surface meshes used for placing and orienting neuron models and corresponding sampling grids for CNNs</li> <li><em>nrn_sim_data/ - </em>Thresholds from NEURON simulations for all 25 model neurons included in the study, each at 4,999-5,000 positions and 12 azimuthal orientations ("ground truth" for CNN) </li> <li><em>cell_data/</em> - Coordinates and morphology information for all model neurons</li> <li><em>weights/</em> - Trained 3D convolutional neural networks for estimating neuron model-specific TMS thresholds given input E-field distributions on a 3D grid (see code/manuscript for dimensions)</li> <li><em>est_data/ </em>- Output of trained CNNs on all E-field data for test dataset <em> </em></li> </ul> <p> </p>
A Study to Evaluate Central Nervous System (CNS) Pharmacodynamic Activity of TAK-653 in Healthy Participants Using Transcranial Magnetic Stimulation (TMS)
ClinicalTrials.gov study NCT03792672. IPD Sharing: YES. Countries: 1. Publications: 1.
Magnetic Resonance Image Verified Early Response to Certolizumab Pegol in Subjects With Active Rheumatoid Arthritis (RA)
ClinicalTrials.gov study NCT01235598. IPD Sharing: Not stated. Countries: 4. Publications: 1.
Magnetic resonance imaging reveals human brown adipose tissue is rapidly activated in response to cold
<p class="MsoNoSpacing"><b>Context.</b> In rodents, cold exposure induces the activation of brown adipose tissue (BAT) and the induction of intracellular triacylglycerol (TAG) lipolysis. However, in humans, the kinetics of supraclavicular (SCV) BAT activation and the potential importance of TAG stores remain poorly defined.</p> <p class="MsoNoSpacing"><b>Objective.</b> To determine the time course of BAT activation and changes in intracellular TAG using magnetic resonance imaging (MRI) assessment of the SCV (i.e. BAT depot) and fat in the posterior neck region (i.e. non BAT).</p> <p class="MsoNoSpacing"><b>Design.</b> Cross-sectional.</p> <p class="MsoNoSpacing"><b>Setting.</b> Clinical research centre.</p> <p class="MsoNoSpacing"><b>Patients or Other Participants.</b> Twelve healthy male volunteers ages 18-29 years [BMI=24.7±2.8kg/m<sup>2</sup> and body fat percentage = 25.0±7.4% (both mean±SD)].</p> <p class="MsoNoSpacing"><b>Intervention(s).</b> Standardized whole-body cold exposure (180 minutes at 18<span>°</span>C) and immediate re-warming (30 minutes at 32°C).</p> <p class="MsoNoSpacing"><b>Main Outcome Measure(s).</b> Proton density fat fraction (PDFF) and T2* of the SCV and posterior neck fat pads. Acquisitions occurred at 5-15 minute intervals during cooling and subsequent warming.</p> <p class="MsoNoSpacing"><b>Results.</b> SCV PDFF declined significantly after only 10 minutes of cold exposure [-1.6% (standard error (SE) 0.44%), <i>p</i>=0.007) and continued to decline until 35 minutes after which time it remained stable until 180 minutes. A similar time course was also observed for SCV T2*. In the posterior neck fat (non-BAT) there were no cold-induced changes in PDFF or T2*. Re-warming did not result in a change in SCV PDFF or T2*.</p> <p class="MsoNoSpacing"><b>Conclusions.</b> The rapid cold-induced decline in SCV PDFF suggests that in humans, BAT is activated quickly in response to cold and that TAG is a primary substrate.</p>
Correlation between LDH/PDH activities ratio and tissue pH in the perfused mouse heart – a potential non-invasive indicator of cardiac pH provided by hyperpolarized magnetic resonance
<p>Primary data for DOI: 10.1002/nbm.4444</p> <p>NMR in Biomedicine. 2021;34:e4444.</p> <p>Title: Correlation between LDH/PDH activities ratio and tissue pH in the perfused mouse heart – a potential non-invasive indicator of cardiac pH provided by hyperpolarized magnetic resonance</p> <p>Authors: David Shaul, Assad Azar, Gal Sapir, Sivaranjan Uppala, Atara Nardi-Schreiber, Ayelet Gamliel, Jacob Sosna, J. Moshe Gomori, and Rachel Katz-Brull</p> <p> </p> <p>These primary datasets contain data presented in the above publication and consist of:</p> <p>1. <sup>31</sup>P-NMR spectra</p> <p>2. Hyperpolarized <sup>13</sup>C-NMR spectra</p> <p>Please consult the Archive Guide.</p>
Use of Functional Magnetic Resonance Imaging (fMRI) to Study Brain Activation in Children With Irritable Bowel Syndrome
ClinicalTrials.gov study NCT00677976. IPD Sharing: Not stated. Countries: 1. Publications: 47.
Active Surveillance Magnetic Resonance Imaging Study
ClinicalTrials.gov study NCT01354171. IPD Sharing: Not stated. Countries: 1. Publications: 2.
A Magnetic Resonance Imaging Study and Arthroscopic Biopsy Substudy in Subjects With Active Rheumatoid Arthritis Receiving VX-509, an Oral JAK3 Inhibitor
ClinicalTrials.gov study NCT01754935. IPD Sharing: Not stated. Countries: 6. Publications: 1.
Magnetic Resonance Imaging (MRI) to Evaluate Activity of Multiple Sclerosis (MS)
ClinicalTrials.gov study NCT00001248. IPD Sharing: NO. Countries: 1. Publications: 5.
Clinical Signs and Changes in Cervical Muscles Activity Evaluated by Magnetic Resonance Imaging During an Endurance Test
ClinicalTrials.gov study NCT06595927. IPD Sharing: NO. Countries: 1. Publications: 1.
Brain Activation and Satiety in Children: Functional Magnetic Resonance Imaging
ClinicalTrials.gov study NCT02484976. IPD Sharing: NO. Countries: 1. Publications: 2.
Optimization of Non-invasive Diaphragm Activation Using Magnetic Phrenic Nerve Stimulation
ClinicalTrials.gov study NCT04176744. IPD Sharing: NO. Countries: 1. Publications: 1.
A Study to Evaluate the Effectiveness of Infliximab and Changes in Hand and Wrist Magnetic Resonance Imaging (MRI) in Participants With Active Rheumatoid Arthritis (RA) (P08136)
ClinicalTrials.gov study NCT01313520. IPD Sharing: YES. Countries: 0. Publications: 2.
Effects Of Atorvastatin On Macrophage Activity And Plaque Inflammation Using Magnetic Resonance Imaging
ClinicalTrials.gov study NCT00368589. IPD Sharing: Not stated. Countries: 1. Publications: 2.
ScienceDex guides
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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.