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31 results for “bistability”
Experimental data for nonlinear dynamics and energy harvesting of bistable cantilever shells (grant 2021/41/B/ST8/03190 from the National Science Centre, Poland)
<p>An experimental tests on a cantilever composite bistable shell with a piezoelectric patch is reported. The shell is characterized by two stable configurations. Periodic force is applied at the shell’s clamped side through an electrodynamic shaker and the dynamic response is measured through an embedded strain gauge. Selected dynamic regimes are recorded by performing excitation frequency and amplitude sweeps. The resonance scenarios around the two natural frequencies corresponding to the stable configurations show different softening behavior. The excitation amplitude threshold level for snap-through motion is identified. The thested thin-walled pseudo-conical shell has been made of carbon-epoxy composite prepreg tape (AS4-GP-12K_40gsm-<br>300mm-ThinPreg135EP). The composite single layer is characterized by unidirectional reinforcement, thickness 0.04 mm. The manufacturing standard samples for strength tests in the autoclave process reduces to about 0.038 mm. </p>
Emergence of cooperative bistability and robustness of gene regulatory networks
<p>Simulation and analysis source codes and obtained data set for "Emergence of cooperative bistability and robustness of gene regulatory network" (<a href="https://doi.org/10.1371/journal. pcbi.1007969">PLoS Comput Biol 16 (2020) e1007969</a> and <a href="https://arxiv.org/abs/1907.12030">arXiv:1907.12030</a>) by Nagata and Kikuchi. </p> <p>Source codes and figures are compiled in Jupyter notebook. Detailed discription of data sets is found in "readme.txt" file.</p> <p> </p>
Dataset of the publication: Unlocking room-temperature bistable spin transition at the nanoscale: the synthesis of core@shell [Fe(NH2trz)3(NO3)2]@SiO2 nanoparticles
<p>Dataset of the publication: Unlocking room-temperature bistable spin transition at the nanoscale: the synthesis of core@shell [Fe(NH2trz)3(NO3)2]@SiO2 nanoparticles</p> <p>DOI: 10.1039/d4dt00911h</p> <p>A. Regueiro, M. Marti-Carrascosa, R. Torres-Cavanillas, E. Coronado </p> <p>Dalton Trans., 53, 20, 8764-8771 (2024)</p>
Data for: Widespread forest-savanna coexistence but limited bistability at a landscape scale in Central Africa
<p>This directory contains the data used in the article **Zwaan et al. (2024) Widespread forest-savanna coexistence but limited bistability at a landscape scale in Central Africa** (DOI: <span><a href="https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoi.org%2F10.1088%2F1748-9326%2Fad8cef&data=05%7C02%7Ca.zwaan%40uu.nl%7C66d868876ad44e69715608dcf9c1c197%7Cd72758a0a4464e0fa0aa4bf95a4a10e7%7C0%7C0%7C638659857776731023%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=3Bk8nBksr5ZBWJF4nfBvx3yp1tbyZiy%2FLlnfwDCZwfE%3D&reserved=0">https://doi.org/10.1088/1748-9326/ad8cef</a></span>).</p> <p>This repository provides the datasets used for the figures and statistics in our research article. We hope that this data can be useful for other researchers. Feel free to explore and analyze the data as needed. If you use this data in your own research, please cite our article.</p> <p><br>**Contact**: For any questions or further information, please contact:<br>* Aart Zwaan<br>* Email: a.zwaan@uu.nl</p>
Data for the conference poster "TiAl6V4 bistable mechanism produced by Laser Powder Bed Fusion"
<p>The dataset contains raw data for conference poster "TiAl6V4 bistable mechanism produced by Laser Powder Bed Fusion" presented at the 9th Metal Additive Manufacturing Conference.</p>
Research data of "Quantum resonant optical bistability with a narrow atomic transition: bistability phase diagram in the bad cavity regime"
<p>The data set includes the matlab programs, measured data and drawings used for the figures in D Rivero et al 2023 New J. Phys. 25 093053</p>
Bistability between π-diradical open-shell and closed-shell states in indeno[1,2-a]fluorene
<p>S. Mishra, M. Vilas-Varela, L.-A. Lieske, R. Ortiz, S. Fatayer, I. Rončević, F. Albrecht, T. Frederiksen, D. Peña, and L. Gross<br><em>Bistability between π-diradical open-shell and closed-shell states in indeno[1,2-a]fluorene</em><br>Nat. Chem. (2024)</p> <p>Indenofluorenes are non-benzenoid conjugated hydrocarbons that have received great interest owing to their unusual electronic structure and potential applications in non-linear optics and photovoltaics. Here, we report the generation of unsubstituted indeno[1,2-a]fluorene, the final and yet unreported parent indenofluorene isomer, on various surfaces by cleavage of two C-H bonds in 7,12-dihydroindeno[1,2-a]fluorene through voltage pulses applied by the tip of a combined scanning tunneling microscope and atomic force microscope. On bilayer NaCl on Au(111), indeno[1,2-a]fluorene is in the neutral charge state, while it exhibits charge bistability between neutral and anionic states on the lower work function surfaces of bilayer NaCl on Ag(111) and Cu(111). In the neutral state, indeno[1,2-a]fluorene exhibits either of two ground states: an open-shell π-diradical state, predicted to be a triplet by density functional and multireference many-body perturbation theory calculations, or a closed-shell state with a para-quinodimethane moiety in the as-indacene core. Switching between open- and closed-shell states of a single molecule is observed by changing its adsorption site on NaCl.</p>
Data from: Bistable soft jumper capable of fast response and high take-off velocity
<p>In contrast to jumping robots made from rigid materials, soft jumpers composed of compliant and elastically deformable materials exhibit superior impact resistance and mechanically robust functionality. However, recent efforts to create stimuli-responsive jumpers from soft materials are limited in their response speed, take-off velocity, and travel distance. Here, we report a magnetic-driven, ultrafast bistable soft jumper that exhibits the highest jumping capability (jumping over 108 body heights with a take-off velocity of over 2 m/s) and the fastest response time (less than 15 ms) compared to previous soft jumping robots. The snap-through transitions between bistable states form a repeatable loop that harnesses the ultrafast release of stored elastic energy. Based on the dynamic analysis, the multimodal locomotion of the bistable soft jumper can be realized: the interwell mode of jumping and the intrawell mode of hopping. These modes are controlled by adjusting the duration and strength of the magnetic field, which endows the bistable soft jumper with robust locomotion capabilities. In addition, it is capable of jumping omnidirectionally with tunable heights and distances. To demonstrate its capability in complex environment, a realistic pipeline with amphibious terrain was established. The jumper successfully finished the simulative task of cleansing polluted water through the pipeline. The design principle and actuating mechanism of the bistable soft jumper can be further extended for other flexible systems.</p>
Optomechanical Backaction in the Bistable Regime
<p>With a variety of realisations, optomechanics utilizes its light matter interaction to test fundamental physics. By coupling the phonons of a mechanical resonator to the photons in a high quality cavity, control of increasingly macroscopic objects has become feasible. In such systems, state manipulation of the mechanical mode is achieved by driving the cavity. To be able to achieve high drive powers the system is typically designed such that it remains in a linear response regime when driven. A nonlinear response and especially bistability in a driven cavity is often considered detrimentally to cooling and state preparation in optomechanical systems and is avoided in experiments. Here we show, that with an intrinsic nonlinear cavity backaction cooling of a mechanical resonator is feasible operating deeply within the nonlinear regime of the cavity. With our theory taking the nonlinearity into account, precise predictions on backaction cooling can be achieved even with a cavity beyond the bifurcation point, where the cavity photon number spectrum starts to deviate from a typical Lorentzian shape.</p>
Trait adaptation enhances species coexistence and reduces bistability in an intraguild predation module
<p><span>Disentangling how species coexist in an intraguild predation (IGP) module is a great step towards understanding biodiversity conservation in complex natural food webs. Trait variation enabling </span><span>individual species</span><span> to adjust</span><span> to ambient conditions may facilitate coexistence. However, it is still unclear how </span><span>co-adaptation of </span><span>all species within the IGP module</span><span>, constrained by complex</span><span> trophic </span><span>interactions</span><span> and </span><span>trade-offs among species-specific traits,</span><span> interactively affects species coexistence and population dynamics.</span> <span>We developed an adaptive IGP model allowing prey and predator species to mutually adjust their </span><span>species-specific</span><span> defensive and offensive strategies to each other. We investigated species persistence, the temporal variation of population dynamics, and the occurrence of bistability in IGP models without and with trait adaptation along a gradient of enrichment</span><span> represented by </span><span>carrying capacity of the basal prey for </span><span>different</span><span> widths</span><span> and speeds of trait adaptation within each species</span><span>. </span><span>Results showed that trait adaptation within multiple species greatly enhanced the coexistence of all three species in the module. A larger width of trait adaptation facilitated species coexistence independent of the speed of trait adaptation at lower enrichment levels, while a sufficiently large and fast trait adaptation promoted species coexistence at higher enrichment levels. Within the oscillating regime, increasing the speed of trait adaptation reduced the temporal variability of biomasses of all species. Finally, species co-adaptation strongly reduced the presence of bistability and promoted the attractor with all three species coexisting.</span> <span>These findings resolve the contradiction between the widespread occurrence of IGP in nature and the theoretical predictions that IGP should only occur under restricted conditions and lead to unstable population dynamics, which broadens the mechanisms presumably underlying the maintenance of IGP modules in nature. Generally, this study </span><span>demonstrates</span> <span>a decisive role of mutual adaptation among complex trophic interactions, </span><span>for enhancing interspecific diversity and </span><span>stabilizing </span><span>food web </span><span>dynamics, arising e.g. from </span><span>intraspecific diversity.</span></p>
Data from: Bistable soft jumper capable of fast response and high take-off velocity
Open the record for dataset details and reuse information.
Trait adaptation enhances species coexistence and reduces bistability in an intraguild predation module
Open the record for dataset details and reuse information.
Electrical spectroscopy of the spin-wave dispersion and bistability in gallium-doped yttrium iron garnet
<p>Dataset accompanying "Electrical spectroscopy of the spin-wave dispersion and bistability in gallium-doped yttrium iron garnet".</p>
Data for "CO2 ocean bistability on terrestrial exoplanets"
<p>Data for reproducing the plots in "CO2 ocean bistability on terrestrial exoplanets," currently (as of 05/13/2022) under review at AGU Advances</p>
Figure data for article "Fluctuation-induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity"
<p>The files contain the data depicted in the figures of the article "Fluctuation-induced Bistability of Fermionic Atoms Coupled to a Dissipative Cavity", arXiv:2409.16035 (2024)</p> <p>The format of the data and to which figure it corresponds is described in the file "read_me_metadata.txt".</p>
Data from: Bistability, non-ergodicity, and inhibition in pairwise maximum-entropy models
Pairwise maximum-entropy models have been used in neuroscience to predict the activity of neuronal populations, given only the time-averaged correlations of the neuron activities. This paper provides evidence that the pairwise model, applied to experimental recordings, would produce a bimodal distribution for the population-averaged activity, and for some population sizes the second mode would peak at high activities, that experimentally would be equivalent to 90% of the neuron population active within time-windows of few milliseconds. Several problems are connected with this bimodality: 1. The presence of the high-activity mode is unrealistic in view of observed neuronal activity and on neurobiological grounds. 2. Boltzmann learning becomes non-ergodic, hence the pairwise maximum-entropy distribution cannot be found: in fact, Boltzmann learning would produce an incorrect distribution; similarly, common variants of mean-field approximations also produce an incorrect distribution. 3. The Glauber dynamics associated with the model is unrealistically bistable and cannot be used to generate realistic surrogate data. This bimodality problem is first demonstrated for an experimental dataset from 159 neurons in the motor cortex of macaque monkey. Evidence is then provided that this problem affects typical neural recordings of population sizes of a couple of hundreds or more neurons. The cause of the bimodality problem is identified as the inability of standard maximum-entropy distributions with a uniform reference measure to model neuronal inhibition. To eliminate this problem a modified maximum-entropy model is presented, which reflects a basic effect of inhibition in the form of a simple but non-uniform reference measure. This model does not lead to unrealistic bimodalities, can be found with Boltzmann learning, and has an associated Glauber dynamics which incorporates a minimal asymmetric inhibition.
Data from: Bistability, non-ergodicity, and inhibition in pairwise maximum-entropy models
Open the record for dataset details and reuse information.
Global coordinated bistable activation of the core region of the ICEclc genomic island in Pseudomonas knackmussii
GEO Series GSE20461. Pseudomonas knackmussii. 6 samples. Type: Expression profiling by array.
Nrm1 is a bistable switch connecting cell cycle progression to transcriptional control
GEO Series GSE287772. Schizosaccharomyces pombe. 78 samples. Type: Expression profiling by high throughput sequencing.
Epigenetically bistable regions across neuron-specific genes govern neuron eligibility to a coding ensemble in the hippocampus
GEO Series GSE150551. Mus musculus. 39 samples. Type: Expression profiling by high throughput sequencing; Methylation profiling by high throughput sequencing.
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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)
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.