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202 results for “rigidity”
Sponge-like rigid structures in frictional granular packings
<p>We show how rigidity emerges in experiments of sheared two-dimensional frictional granular materials by using generalizations of two methods for identifying rigid structures. Both approaches, the force-based dynamical matrix and the topology-based rigidity percolation, agree with each other and identify similar rigid structures. As the system becomes jammed, at a critical contact number z = 2.4±0.1, a rigid backbone interspersed with floppy, particle-filled holes of a broad range of sizes emerges, creating a sponge-like morphology. While the pressure within rigid structures always exceeds the pressure outside the rigid structures, they are not identified with the force chains of shear jamming. These findings highlight the need to focus on mechanical stability arising through arch structures and hinges at the mesoscale.</p>
Bent out of shape: The visual inference of non-rigid shape transformations applied to objects
<p>Dataset relative to the following publication:</p> <p>Spröte, P., & Fleming, R. W. (2016). Bent out of shape: The visual inference of non-rigid shape transformations applied to objects. <em>Vision research, 126</em>, 330-346. <a href="https://doi.org/10.1016/j.visres.2015.08.009">https://doi.org/10.1016/j.visres.2015.08.009</a></p> <p>Each folder contains the data relative to one experiment and a text file with comments.</p>
Data supporting "Lessons learned from multi-objective automatic optimizations of classical three-site rigid water models using microscopic and macroscopic target experimental observables"
<p>This repository contains the set of data and the code to reproduce the results shown in "Lessons learned from multi-objective automatic optimizations of classical three-site rigid water models using microscopic and macroscopic target experimental observables" published on Journal of Chemical Engineering and Data (DOI: 10.1021/acs.jced.3c00538).</p>
Research data supporting ""Lessons learned from multi-objective automatic optimizations of classical three-site rigid water models using microscopic and macroscopic target experimental observables""
<p>This repository contains the set of data and the code to reproduce the results shown in "Lessons learned from multi-objective automatic optimizations of classical three-site rigid water models using microscopic and macroscopic target experimental observables" published on Journal of Chemical Engineering and Data (DOI: 10.1021/acs.jced.3c00538).</p>
Tunable rebound of millimeter-sized rigid balls by magnetic actuation of elastomer-based surface microstructures
<p>This is the data used to plot Figures 7-10 of our paper "Tunable rebound of millimeter-sized rigid balls by magnetic actuation of elastomer-based surface microstructures".</p>
Supporting data for "Rigidity transition of a highly compressible granular medium"
<p>This repertory contains the supporting data for the article "Rigidity transition of a highly compressible granular medium"</p> <p>Content:<br>- supplementary_videos<br>The seven supplementary videos associated with the article.<br>- assembly <br>The experimental raw force data and data processed by image analysis of the ring assemblies, for all the parameters explored.<br>- single_ring<br>The FEM data and processed experimental data for the single ring compression and interactions. <br>- COMSOL <br>Contains the COMSOL files to run the FEM simulations and the associated Neo-Hookean material law. <br>- image_analysis<br>Raw images of the five first cycles for gamma_0=0.40 and \Phi=1.00, with a MATLAB code to process the images and extract the relevant quantities. </p> <p>Each category comes with a dedicated README.txt that details its content. </p>
Research data supporting "Ephemeral Ice-Like Local Environments in Classical Rigid Models of Liquid Water"
<p>This repository contains the set of data shown in the paper <strong>"</strong><em>Ephemeral Ice-Like Local Environments in Classical Rigid Models of Liquid Water</em>", published on the Journal of Chemical Physics (DOI:10.1063/5.0088599).</p>
Dataset of the experimental campaign presented in the paper entitled "Shaking table seismic experimental investigation of lightweight rigid bodies"
<p>This study presents the findings of an extensive shaking table experimental campaign conducted on nine free standing wooden specimens, aiming at providing insights on the rigid body motion of free-standing objects. The specimens, which differ in slenderness and size, are characterized by impairments in their base surface and most likely in their shapes, which also lead to asymmetric responses. The imperfections of the tested objects are an additional source of uncertainty with respect to the intrinsic chaotic character of the rigid body motion, which is a crucial factor that prevents the reproducibility of the tests and induces discrepancies between specimen responses and those of their ideal models. A contactless measurement strategy is employed to assure unaltered data acquisition. The experimental campaign includes free vibration tests, pulse excitation and natural ground motions tests; the dynamic responses of the specimens are organized and rearranged, aiming at providing a comprehensive set of data that could be employed for calibrating numerical models accounting for imperfect conditions. The damping properties of the specimens are discussed, providing a novel estimation of the coefficient of restitution based on the free vibration tests. The limits of the ideal simple rigid model are highlighted, and the roles of size factor and aspect ratio are discussed according to the obtained results.</p>
Rigid Shell Rolling on a Dimpled Bowl-shaped Rigid Surface Example 2
<p>The computations use zero-mass particles--the first use of such particles in nonrelativistic classical mechanics—to perform these animations.</p> <p>The four animation files deal with simulations for Cases A, B, C, and D of Example 2, in the above-mentioned paper in the Special Issue. Each file shows an animation for 25 s of the shell rolling on the surface, without slipping. Each animation shows the dimpled surface and the complex motion of the shell as it finds its path over the dimpled surface.</p> <p>The different cases (A to D) relate to the different orientations of the non-uniform shell at the start of the animation with respect to the surface. At the beginning of each animation the shell is shown for a few extra seconds so that its initial orientation can be observed. The location of the point on the sphere that touches the surface at the start of the animation is the same for all the 4 different animations; the initial velocity of the geometric center of the shell is also the same in all the animations.</p> <p>As seen, the motion of the non-uniform shell and the path it takes on the surface is highly sensitive to its orientation at the start of the animation with respect to the surface. The motion is slowed in these animations so that the extremely complex motion of the shell can be seen better.</p> <p>For details of each case (A to D) see the paper.</p>
Dataset for journal JFS: "Near-wake characteristics of rigid and membrane wings in ground effect" 2018 by R.Bleischwitz, R.de Kat, B.Ganapathisubramani
<p>Complete Dataset for Journal of Fluids and Structures publication:</p> <p>"Near-wake characteristics of rigid and membrane wings in ground effect" (2018) by, R.Bleischwitz, R.de Kat, B.Ganapathisubramani<br> Written 01-04-2018<br> by Robert Bleischwitz (robert.bleischwitz@gmail.com)</p> <p>General Comments</p> <p>0.) This specific upload contains the full timeresolved dataset of the JFS-paper (~27GB of timeresolved MATLAB files)</p> <p>1.) The attached time-resolved-data relates to experimental windtunnel measurements on passive membrane wings for MAVs. The data was aquired between 2012-2016 at the University of Southampton, involving Robert Bleischwitz as PhD student, who was supervised by Roeland de Kat and Bharathram Ganapathisubramani.</p> <p>2.) The attached data is given time-resolved and time-synchronised at 800Hz over a imaging-period of 5000 images, involving load measurements via a 6-axis load-cell ATI Nano17 /25N, deformation measurements via Digitial Image Processing (high-speed DIC) and stereo flow measurements via two high-speed cameras (high-speed stereo PIV). </p> <p>3.) More setup and processing details can be found in the paper "Near-wake characteristics of rigid and membrane wings in ground effect" (2018) by the authors R. Bleischwitz, R. de Kat, B. Ganapathisubramani<br> Published in:</p> <p>-Journal of Fluids and Structures: <a href="https://doi.org/10.1016/j.jfluidstructs.2018.03.007">https://doi.org/10.1016/j.jfluidstructs.2018.03.007</a> </p> <p>- University of Southampton: <a href="http://doi.org/10.5258/SOTON/D0461">http://doi.org/10.5258/SOTON/D0461</a> </p> <p>4.) All load/deformation/flow folders contain a README.txt(Use 1st) and Instructions.m (Use 2nd) MATLAB-file, which give further supporting details how to illustrate the time-resolved-data</p> <p>5.) This specific upload contains the full time-resolved dataset, including:</p> <p>-Cases:</p> <p>a.) Rigid and Membrane wings</p> <p>b.) Height of ground(from trailing edge, in referecne to chord length): h/c=2, 0.25 and 0.1</p> <p>c.) Angle-of-attack: 10,15,25deg</p> <p>d.) DATA available (Timeresolved and time-synchronised):</p> <p>-Loads in high speed (10 kHz)</p> <p>-Membrane deformations in high speed(800Hz)</p> <p>-Stereo Flow velocities in wake at high-speed (800Hz)</p> <p><strong><em>Abstract of Journal-publication:</em><br> Wind tunnel measurements are conducted at a Reynolds numbers of Re = 56,000 to examine the characteristics of<br> near-wake vortices of rigid flat-plates and membrane wings from free-flight into ground–effect conditions. Synchronised<br> high-speed load cell measurements, digital image correlation and particle image velocimetry are performed to<br> resolve lift, drag and pitch oscillations simultaneously with membrane deformation and flow dynamics. Flow measurements<br> are acquired in a crossflow-plane, one chord downstream of the trailing-edge, allowing the examination of<br> time evolution of the wake and its relationship to the forces and membrane deformation. Membrane wings are found<br> to delay ground–effect or high angles-of-attack induced tip-vortex break-down and result in larger tip-vortex push-out<br> (beyond the wing span) compared to rigid flat-plate wings. The leading-edge vortex appears to shed with streamwise<br> vorticity close to the root of the wing and this frequency of this shedding is found to match with the dominant frequency<br> observed in membrane fluctuations. In specific resonance conditions, membrane and flow fluctuations are found to<br> correlate well to the fluctuations in loads and moments.</strong></p>
Data from: Modulation of yaw stability with an unstable rigid body and a stabilising caudal fin in the yellow boxfish (Ostracion cubicus)
<p>Despite that boxfishes have a rigid carapace that restricts body undulation, they are highly manoeuvrable and manage to swim with remarkably dynamic stability. Recent research has indicated that the rigid body shape of boxfishes shows an inherently unstable response in its rotations caused by course-disturbing flows. Hence, any net stabilising effect should come from the fish's fins. The aim of the current study was to determine the effect of the surface area and orientation of the caudal fin on the yaw torque exerted on the yellow boxfish, <i>Ostracion cubicus</i>, a square cross-sectional shaped species of boxfish. Yaw torques quantified in a flow tank using a physical model with an attachable closed or open caudal fin at different body and tail angles and at different water flow speeds showed that the caudal fin is crucial for controlling yaw. These flow tank results were confirmed by computational fluid dynamics simulations. The caudal fin therefore acts as both a stabiliser and rudder for the naturally unstable rigid body with regard to yaw. Boxfishes seem to use the interaction of the unstable body and active changes in the shape and orientation of the caudal fin to modulate manoeuvrability and stability.</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>
Lumped Element Rigid Panel Dynamics Model
<p>This code is a lumped element rigid panel dynamics model calculating natural frequencies and mode shapes for radiator panels connected by thin kinked tubes. The panels are connected by torsional spring elements, and this work is compared against a continuous equivalent stiffness beam model. Data is included for the example being calculated, however, it can be easily modified for any number of panels.</p> <p>This work is part of Kyle Marquis' 2021 Master's Thesis at the University of Colorado Boulder, titled "A Novel Deployable Radiator Architecture for High-Power Spacecraft Missions by Connecting Tapered and Layered Panels with Thin Kinked Tubes".</p>
Membrane rigidity regulates E. coli proliferation rates
<p>Combining single cell experiments, population dynamics and theoretical methods of membrane mechanics, we put forward that the rate of cell proliferation in E. coli colonies can be regulated by modifiers of the mechanical properties of the bacterial membrane. Bacterial proliferation was modelled as mediated by cell division through a membrane constriction divisome based on FtsZ, a mechanically competent protein at elastic interaction against membrane rigidity. Using membrane fluctuation spectroscopy in the single cells, we revealed either membrane stiffening when considering hydrophobic long chain fatty substances, or membrane softening if short-chained hydrophilic molecules are used. Membrane stiffeners caused hindered growth under normal division in the microbial cultures, as expected for membrane rigidification. Membrane softeners, however, altered regular cell division causing persistent microbes that abnormally grow as long filamentous cells proliferating apparently faster. We invoke the concept of effective growth rate under the assumption of a heterogeneous population structure composed by distinguishable individuals with different FtsZ-content leading the possible forms of cell proliferation, from regular division in two normal daughters to continuous growing filamentation and budding. The results settle altogether into a master plot that captures a universal scaling between membrane rigidity and the divisional instability mediated by FtsZ at the onset of membrane constriction.</p> <p><br> </p>
Dataset of redundantly rigid graphs
<p>This data set collectes all redundantly rigid graphs for dimension d<=25 with at most d+k vertices, where k might be different.<br> The graphs are collected in a zip file with respect to the dimension. Graphs are stored in graph6 data format.</p>
Ca2+ imaging data for: A rigidity transition of MEC-2/Stomatin condensates controls neuronal mechanotransduction during touch sensing
<p>Calcium imaging data from Sanfeliu et al, NCB, 2023.</p> <p>Project contains fluorescence data to characterize the activity of the touch receptor neurons (TRNs) - which are mechanically activated upon touch – in the model organism <em>Caenorhabditis elegans</em>. The set of data includes wild-type animals as a reference and two different mutants to understand their role during touch sensation: MEC-2(R385H) and UNC-89 knock-out.</p> <p> </p>
DockGame: Cooperative Games for Multimeric Rigid Protein Docking
<p>Raw datasets used for DB5.5 dataset and DIPS dataset used in DockGame, with associated code at https://github.com/vsomnath/dockgame </p> <p>These datasets can also be downloaded from https://zlab.umassmed.edu/benchmark (DB5.5) and https://www.dropbox.com/s/sqknqofy58nlosh/DIPS.zip?dl=0 (DIPS). Note that our organization would be slightly different from these downloaded versions.</p> <p>We follow EquiDock (https://github.com/octavian-ganea/equidock_public) for the DB5 dataset splits.</p> <p><strong>Paper Abstract</strong></p> <p>Protein interactions and assembly formation are fundamental to most biological processes. Predicting the assembly structure from constituent proteins -- referred to as the protein docking task -- is thus a crucial step in protein design applications. Most traditional and deep learning methods for docking have focused mainly on binary docking, following either a search-based, regression-based, or generative modeling paradigm. In this paper, we focus on the less-studied multimeric (i.e., two or more proteins) docking problem. We introduce DockGame, a novel game-theoretic framework for docking -- we view protein docking as a cooperative game between proteins, where the final assembly structure(s) constitute stable equilibria w.r.t. the underlying game potential. Since we do not have access to the true potential, we consider two approaches - i) learning a surrogate game potential guided by physics-based energy functions and computing equilibria by simultaneous gradient updates, and ii) sampling from the Gibbs distribution of the true potential by learning a diffusion generative model over the action spaces (rotations and translations) of all proteins. Empirically, on the Docking Benchmark 5.5 (DB5.5) dataset, DockGame has much faster runtimes than traditional docking methods, can generate multiple plausible assembly structures, and achieves comparable performance to existing binary docking baselines, despite solving the harder task of coordinating multiple protein chains.</p>
Evaluation of a Novel Semi-Rigid Brace for Adolescent Idiopathic Scoliosis
ClinicalTrials.gov study NCT07040150. IPD Sharing: NO. Countries: 1. Publications: 2.
Comparison of GlideScope-Specific Rigid Stylet to Standard Malleable Stylet for GlideScope Intubation by Novice Operators
ClinicalTrials.gov study NCT00884754. IPD Sharing: Not stated. Countries: 1. Publications: 1.
16% Carbamide Peroxide Home Bleaching: Soft vs. Rigid Tray in a Randomized Blinded Equivalence Trial
ClinicalTrials.gov study NCT06881654. IPD Sharing: NO. Countries: 1. Publications: 3.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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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.