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307 results for “nonlinearity”
Modulation Analysis of Whistler Mode Sidebands in VLF Triggered Emissions and Implications for Conditions of Nonlinear Growth
<p>A data set from the Siple experiments (Siple Station Antartica) generated on December 8, 1986. A brief explanation of the data:</p> <p>We investigated one particular 35.5 second record that shows the repeated generation of sidebands. This record, occurring on December 8, 1986 during 14:24:29.30 UT -14:24:64.80 UT was triggered by the transmission of a constant amplitude and constant frequency “key down” tone at 2.7 kHz which, remarkably, was observed as 17 individual ∼2 second packets with sidebands and triggered free running emissions in the conjugate region. </p> <p>To open the data, you will need the files - matGetVariable.m AND matGetHeader.m.</p>
Nonlinear self calibrated spectrometer with single GeSe-InSe heterojunction device
<p>Computational spectrometry is an emerging field that employs photodetection in conjunction with numerical algorithms for spectroscopic measurements. Compact single photodetectors made from layered materials are particularly attractive since they eliminate the need for bulky mechanical and optical components used in traditional spectrometers and can easily be engineered as heterostructures to optimize device performance. However, such photodetectors are typically nonlinear devices, which adds complexity to extracting optical spectra from their response. Here, we train an artificial neural network (ANN) to recover the full nonlinear spectral photoresponse of a single GeSe-InSe p-n heterojunction device. The device has a spectral range of 400-1100 nm, a small footprint of ~25×25 〖μm〗^2, and a mean reconstruction error of 〖2×10〗^(-4) for the power spectrum at 0.35 nm. Using our device, we demonstrate a solution to metamerism, an apparent matching of colors with different power spectral distributions, which is a fundamental problem in optical imaging.</p>
Substorm Dataset (SI Dataset 1 - Substorm Identification With The WINDMI Magnetosphere - Ionosphere Nonlinear Physics Model)
<p>Dataset information on substorm onset times, magnetic local times, magnetic latitudes, geographic latitudes, and longitudes, along with detection techniques and their abbreviations (utilized by authors Forsyth, Frey, Liou, Newell, and Ohtani). Columns denote the presence (1) or absence (0) of substorms detected by each technique. Time differences between substorms are recorded. Additionally, it includes counts of techniques detecting substorm onsets, WINDMI model trigger occurrences based on field-aligned current crossing a critical threshold, Geotail current with median and 70th percentile Ic, where Ic doubles as the threshold for WINDMI substorm detection, and maximum field-aligned current during substorm onsets.</p>
Research data supporting "Observation of nonlinear response and Onsager regression in a photon Bose-Einstein condensate"
<p>This repository contains the data presented in the manuscript titled "Observation of nonlinear response and Onsager regression in a photon Bose-Einstein condensate" by A. Sazhin et al., Nature Communications <strong>15</strong>, Article number: <span>4730</span> (<span>2024</span>), arXiv:2403.04705. The files named 'fig{1,2,3,4}.xlsx' contain the final data sets relevant to reproduce all plots shown in the paper.</p>
Seasonal footprints on ecological time series and jumps in dynamic states of protein configurations from a nonlinear forecasting method characterization (DataSet)
<p>Data from the article: <br>"Seasonal footprints on ecological time series and jumps in dynamic states of protein configurations from a nonlinear forecasting method characterization", L. Reyes, K. Campos, G. D. Avendaño, L. González-Paz, A. Vivas, Y. J. Alvarado, and S. Flores.</p> <p>Data to be used with some implementation of the forecasting method of reference:<br>Sugihara G. and May R. M., Nonlinear forecasting as a way of distinguishing chaos from measurement error in time series, <em>Nature</em> <strong>344</strong>, 734–741 (1990).</p>
Raw data for 'Low-loss high-Q silicon-rich silicon nitride microresonators for Kerr nonlinear optics'
<p>It's the raw data for the paper 'Low-loss high-Q silicon-rich silicon nitride microresonators for Kerr nonlinear optics'</p>
Modeling energetic electron nonlinear wave-particle interactions with electromagnetic ion cyclotron waves
<p>Simulation data set for the JGR paper "Modeling energetic electron nonlinear wave-particle interactions with electromagnetic ion cyclotron waves". Data formats are in ASCII and Matlab mat file. Data contents are self-explanatory by their file names.</p>
Experimentally Measuring an Isolated Branch of Nonlinear Normal Modes
<p>Dataset for "Experimentally Measuring an Isolated Branch of Nonlinear Normal Modes", Journal of Sound and Vibration.</p> <p>See "readme.txt" for details</p>
Data presented in the figures of "Nonlinear Mach–Zehnder interferometer with ultrabroadband squeezed light"
<p>Data presented in our paper D. B. Horoshko, M. I. Kolobov, F. Gumpert, I. Shand, F. König & M. V. Chekhova "Nonlinear Mach–Zehnder interferometer with ultrabroadband squeezed light", Journal of Modern Optics, DOI: 10.1080/09500340.2019.1674394</p>
Integrated Gallium Phosphide Nonlinear Photonics
<p>Gallium phosphide (GaP) is an indirect bandgap semiconductor used widely in solid-state lighting. Despite numerous intriguing optical properties|including large chi(2) and chi(3) coefficients, a high refractive index (> 3), and transparency from visible to long-infrared wavelengths (0.55-11 \mum) its application as an integrated photonics material has been little studied. Here we introduce GaP-on-insulator as a platform for nonlinear photonics, exploiting a direct wafer bonding approach to realize integrated waveguides with 1.2 dB/cm loss in the telecommunications C-band (on par with Si-on-insulator). High quality (Q > 105), grating-coupled ring resonators are fabricated and studied. Employing a modulation transfer approach, we obtain a direct experimental estimate of the nonlinear index of GaP at telecommunication wavelengths: n2 = 1.2(5)*10^17 m^2/W. We also observe Kerr frequency comb generation in resonators with engineered dispersion. Parametric threshold powers as low as 3 mW are realized, followed by broadband (> 100 nm) frequency combs with sub-THz spacing, frequency-doubled combs and, in a separate device, efficient Raman lasing. These results signal the emergence of GaP-on-insulator as a novel platform for integrated nonlinear photonics.</p>
Nonlinear periodic and supernonlinear periodic ion-acoustic wave solutions for the mKdV equation
<p>(a) - (b) Nonlinear periodic ion-acoustic wave solutions and (c) Supernonlinear periodic ion-acoustic wave solution of the mKdV equation.</p>
Data from: Fundamental properties of adjoint model and adjoint sensitivity under fully-nonlinear hydrostatic internal gravity waves
<p>This folder contains data from</p> <p>Shimizu, K. (2024), Fundamental properties of adjoint model and adjoint sensitivity under fully-nonlinear hydrostatic internal gravity waves, Journal of Geophysical Research: Oceans, 129, e2023JC020577. https://doi.org/10.1029/2023JC020577</p> <p>Its contents are briefly described in ReadMe.txt.</p>
Nitrogen addition amplifies the nonlinear drought response of grassland productivity to extended growing-season droughts
<p>Understanding the response of grassland production and carbon exchange to intra-annual variation in precipitation and nitrogen addition is critical for sustainable grassland management and ecosystem restoration. We introduced growing-season drought treatments of different lengths (15, 30, 45 and 60 day drought) by delaying growing-season precipitation in a long-term nitrogen addition experiment in a low diversity meadow steppe in northeast China. Response variables included aboveground biomass (AGB), ecosystem net carbon exchange (NEE), and leaf net carbon assimilation rate (<i>A</i>). In unfertilized plots drought decreased AGB by 13.7% after a 45 day drought and 31.7% after a 60 day drought (47.6% in fertilized plots). Progressive increases in the drought response of NEE were also observed. The effects of N addition on the drought response of productivity increased as drought duration increased, and these responses were a function of changes in AGB and biomass allocation, particularly root to shoot ratio. However, no significant effects of drought occurred in fertilized or unfertilized plots in the growing season a year after the experiment, N addition did limit the recovery of AGB from severe drought during the remainder of the current growing season. Our results imply that chronic N enrichment could exacerbate the effects of growing-season drought on grassland productivity caused by altered precipitation seasonality under climate change, but that these effects do not carry over to the next growing season.</p>
Supplemental material to 'A variational rigid-block modelling approach to nonlinear elastic and kinematic analysis of failure mechanisms in historic masonry structures subjected to lateral actions'
<p>This repository contains the data necessary to reproduce the content of the article:</p> <blockquote> <p>A variational rigid-block modelling approach to nonlinear elastic and kinematic analysis of failure mechanisms in historic masonry structures subjected to lateral actions (2021). Earthquake Engineering & Structural Dynamics, 1–23. <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/eqe.3512">https://doi.org/10.1002/eqe.3512</a></p> </blockquote> <p>The file <strong>01_Dataset.zip</strong> contains the dataset. The companion document <strong>00_Dataset_description.pdf </strong>describes the content of the dataset, guiding the analyst to its use in order to (i) reproduce the article's results and (ii) compare the article's results to new results brought by the analyst, e.g. by comparison with other numerical models.</p> <p>Version history</p> <p>v2: updated references in 00_dataset description.pdf </p>
Integrating ecosystem metabolism and consumer allochthony reveals nonlinear drivers in lake organic matter processing
<p>Lakes process both terrestrial and aquatic organic matter, and the relative contribution from each source is often measured via ecosystem metabolism and terrestrial resource use in the food web (i.e., consumer allochthony). Yet, ecosystem metabolism and consumer allochthony are rarely considered together, despite possible interactions and potential for them to respond to the same lake characteristics. In this study, we compiled global datasets of lake gross primary production (GPP), ecosystem respiration (ER), and zooplankton allochthony to compare the strength and shape of relationships with physicochemical characteristics across a broad set of lakes. GPP was positively related to total phosphorus (TP) in lakes with intermediate TP concentrations (11 - 75 μg L<sup>-1</sup>) and was highest in lakes with intermediate dissolved organic carbon (DOC) concentrations. While ER and GPP were strongly positively correlated, decoupling occurred at high DOC concentrations. Lastly, allochthony had a unimodal relationship with TP and related variably to DOC. By integrating metabolism and allochthony, we identified similar change points in GPP and zooplankton allochthony at intermediate DOC (4.5 - 10 mg L<sup>-1</sup>) and TP (8 - 20 μg L<sup>-1</sup>) concentrations, indicating that allochthony and GPP may be coupled and inversely related. The ratio of DOC : nutrients also helped to identify conditions where lake organic matter processing responded more to autochthonous or allochthonous organic matter sources. As lakes globally face eutrophication and browning, predicting how lake organic matter processing will respond requires an updated paradigm that incorporates nonlinear dynamics and interactions.</p>
Coordinating directional switches in pigeon flocks: The role of nonlinear interactions
<p>MatLab Code for paper "Coordinating directional switches in pigeon flocks: The role of nonlinear interactions".</p>
Impact of nonlinear hydrodynamic modelling on geometric optimisation of a spherical heaving point absorber
<p>Due to the amount of iterative computation involved, researchers involved in geometric optimisation of wave energy devices typically employ linear hydrodynamic models. However, the exaggerated motion of wave energy devices, aided by energy maximising control action, challenges the assumptions upon which linear hydrodynamic modelling relies. Furthermore, the optimal device geometry is also sensitive to the nature of the energy-maximisation controller employed, and to the set of wave conditions over which the optimisation is carried out.<br> <br> In order to focus on the essential issues, this study takes the simplest possible device for optimisation, a heaving sphere (with just one free parameter), but one which exhibits nonlinear hydrodynamic characteristics, due to the non-uniform cross-sectional area. The study examines the sensitivity to the inclusion of nonlinear Froude-Krylov forces. In addition, the sensitivity of the optimal device size to differences in the applied control algorithm is also studied, as are effects due to different representative sea state representations and performance evaluation criteria.</p>
BISICLES Pine Island Glacier simulations with nonlinear friction
<p>Model simulations of the ice sheet model BISICLES for 100 years on a set of topographies, sampled form a GP (plus BM2 and BedMachine) with m=1/3 Weertman friction law exponent.</p> <p>See chapter 5 of DOI: <a href="https://doi.org/10.21954/ou.ro.0001223d">https://doi.org/10.21954/ou.ro.0001223d</a> for more information</p>
Data supporting the publication "Enhanced nonlinear optomechanics in a coupled-mode photonic crystal device"
<p>Data supporting the publication "Enhanced nonlinear optomechanics in a coupled-mode photonic crystal device". Set contains raw measured data and plotted data points for all figures in the main text.</p>
Nonlinear responses of metals and composites
<p>Dataset composed of two main parts<br> 1. Material characterization of a metal (from lab test)</p> <p> Single file: `metal-tensile.txt`<br> Material characteristics:<br> - isotropic elastoplastic material with isotropic hardening<br> - poisson ratio = 0.3<br> Geometrical characteristics:<br> - specimen geometry: bar<br> - initial length = 1000 mm<br> - initial cross section = 35.28 mm^2<br> Loading characteristics:<br> - uniaxial tension</p> <p> 2. Composite open-hole substructure characterization (from FE simulations)</p> <p> Multiple files: `EaX_EbY_EsZ.txt` (see README.txt for nomenclature)<br> Layup:<br> - [45/90/-45/0]s<br> Damage criterion:<br> - Hashin with cohesive damage propagation<br> - No delaminations considered<br> Loading characteristics:<br> - Homogenized strain loading over the plate edges<br> - In plane loading: different combinations of (eps_1, eps_2, eps_12)<br> - In plane response: (sig_1, sig_2, sig_12), i.e. homogenized stresses</p>
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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.