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695 results for “topologies”
Topological engineering of terahertz light using electrically tuneable exceptional point singularities
<p>Dataset and codes for the manuscript "Topological engineering of terahertz light using electrically tuneable exceptional point singularities".</p>
H2020 Platone Italian Demonstrator Use Case 1-2 Topology and asset description
<p>Description of the database "areti_production_PV_customer_2021":</p> <p>Data of the PV plant installed at the users' place.</p> <p>Data referred to several customers related to the year 2021.</p> <p>In the database you will find:</p> <p>PoD: Point od Delivery of the users' place (PoD) identification code;<br> Rated Power (peak) [W]: photovoltaic plant rated power peak in W;<br> Rated Voltage [Vac]: photovoltaic plant rated voltage in V;<br> Supply Type (at PoD): supply voltage of plat where the PV plant is connected (1Ph: single-phase; 3Ph: three-phase).</p> <p>_________________________________<br> </p> <p>Description of the database "areti_storage_customer_2021":</p> <p>Data of storage system installed at the users' place.</p> <p>Data referred to several customers related to the year 2021.</p> <p>In the database you will find: </p> <p>PoD: Point od Delivery of the users' place (PoD) identification code;<br> Rated Power (charging) [kVA]: rated power in kVA of storage during charging phase;<br> Rated Power (discharging) [kVA]: rated power in kVA of storage during discharging phase;<br> Max Rated Power (charging) [kVA]: max rated power in kVA of storage during charging phase;<br> Max Rated Power (discharging) [kVA]: max rated power in kVA of storage during discharging phase;<br> Rated Voltage [V]: rated voltage in V of storage;<br> Supply Type: supply type (1Ph: single-phase);<br> Max capacity [kWh]: max capacity in kWh of storage;<br> DoD: Depth of Discharge of storage; <br> Setting Power Factor Range [p.u.]: range of settable power factor of storage;</p> <p>(Useful link to consult Italian UC:</p> <p><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmart-grid-use-cases.github.io%2Fdocs%2Fusecases%2Fplatone%2Fuc-it-1-voltage-management%2F&data=04%7C01%7Cfabio.bastianelli%40mail-bip.com%7C0bb5a42aac0c49cb876708d9f2c89510%7Cbb1a63ebeb09471aa00537b07792a5b5%7C0%7C0%7C637807765572787908%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ptAsS52VBberHmZqIzYEXZs1PQrXQ6TDz6mNK%2FNWnk0%3D&reserved=0">https://smart-grid-use-cases.github.io/docs/usecases/platone/uc-it-1-voltage-management/</a></p> <p><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmart-grid-use-cases.github.io%2Fdocs%2Fusecases%2Fplatone%2Fuc-it-2-congestion-management%2F&data=04%7C01%7Cfabio.bastianelli%40mail-bip.com%7C0bb5a42aac0c49cb876708d9f2c89510%7Cbb1a63ebeb09471aa00537b07792a5b5%7C0%7C0%7C637807765572787908%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xWNOqSeS5JxDoBEWZ4aB63gLmsnTA8YGGfCOoLjo1eo%3D&reserved=0">https://smart-grid-use-cases.github.io/docs/usecases/platone/uc-it-2-congestion-management/</a></p> <p><a href="https://platone-h2020.eu/data/deliverables/864300_M12_D1.1.pdf">https://platone-h2020.eu/data/deliverables/864300_M12_D1.1.pdf</a>)</p>
Decomposition, topology, properties, and graphs of 10 tree species of Caatinga vegetations
<p>Data were obtained from the observation of ten individuals from ten species growing in a semiarid area of Caatinga vegetation under natural conditions in the Northeast of Brazil in Paraiba State, located at the Fazenda Pocinho (7º29'46" S, 35º58'12" W) in the municipality of Barra de Santana, Brazil. The woody crowns were drawn (skeletonized) in the 2-D format as rooted trees resulting in networks with nodes and connectors following the methodology described by Prado et al. (2020, https://doi.org/10.1016/j.jtbi.2020.110318). Skeletonized crowns capture the data of decomposition, topology, and properties.</p>
Decomposition, topology, properties, and graphs of 14 individuals of Cenostigma pyramidale (Tul.) Gagnon & G.P. Lewis, a Caatinga tree species
<p>Data were obtained from the observation of 14 individuals of the tree species <em>Cenostigma pyramidale</em> (Tul.) Gagnon & G.P. Lewis growing in a semiarid area in Caatinga vegetation under natural conditions in the Northeast of Brazil in Paraiba State, located at the Fazenda Pocinho (7º29'46" S, 35º58'12" W) in the municipality of Barra de Santana. The woody crowns were drawn (skeletonized) in the 2-D format as rooted trees resulting in networks with nodes and connectors named woody crown networks. The data of decomposition, topology, and some properties are captured by skeletonized crowns following the methodology described by Prado et al. (2020, <a href="https://doi.org/10.1016/j.jtbi.2020.110318">https://doi.org/10.1016/j.jtbi.2020.110318</a>).</p>
Nontrivial gapless states at the stacking faults of weak topological insulators
<p>This code is used to study the topological properties of weak topological insulators in the presence of a stacking fault. Each WTI is made by a stack of zigzag ribbons stacked on top of each other in the z direction. There are two types of WTIs taken into consideration. One has a topological ribbon and a insulating spacer in each unit cell (two layers per unit cell). The other one has one topological layer and two spacers in each unit cell (three layers per unit cell).</p>
Data for "Ultrafast Spin-Charge Conversion at SnBi2Te4/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy"
<p>Data for "Ultrafast Spin-Charge Conversion at SnBi2Te4/Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy"</p> <p>(<a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202102061">https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202102061</a> and <a href="https://arxiv.org/pdf/2203.08756.pdf">https://arxiv.org/pdf/2203.08756.pdf</a>)</p> <p> </p> <p>E Rongione, S Fragkos, L Baringthon, J Hawecker, E Xenogiannopoulou, P Tsipas, C Song, M Mičica, J Mangeney, J Tignon, T Boulier, N Reyren, R Lebrun, J‐M George, P Le Fèvre, S Dhillon, A Dimoulas, H Jaffrès</p>
Mixed higher-order topology: boundary non-Hermitian skin effect induced by a Floquet bulk
<p>Code and data used to produce the numerical results of "Mixed higher-order topology: boundary non-Hermitian skin effect induced by a Floquet bulk"</p>
Continuous generation of topological defects in a passively driven nematic liquid crystal DATA
<p>Data and code associated with the paper titled "Continuous generation of topological defects in a passively driven nematic liquid crystal".</p>
A Multilayer Graph Model of the Internet Topology - Dataset (2012)
<p><strong>Content:</strong> This dataset contains an integrated snapshot of the Internet Topology (year 2012) with corresponding graph models at the IP, Router, PoP, AS and ISP layers.</p> <p><strong>Purpose:</strong> Despite intensive research during the last two decades, the detailed structural composition of the Internet is still opaque to researchers. Nevertheless, due to the importance of Internet maps for the development of more effective routing algorithms, security mechanisms, and resilience management, more detailed insights are required. This article advances the understanding of the Internet structure by integrating data from different large-scale measurement campaigns into a set of comprehensive Internet graphs at different abstraction levels, and analyzes them in terms of important statistics and graph measures.</p> <p><strong>Design/methodology/approach:</strong> This study follows the topology measurement framework suggested by Gunes and Sarac (2009), involving three phases: topology collection, topology construction, and topology analysis.</p> <p><strong>Findings:</strong> An integrated data set of Internet graphs at different abstraction layers is provided that can serve as a baseline for future research on Internet analytics. Furthermore, results of important graph metrics are presented and power-law relationships for the degree distributions on every level of the current Internet are substantiated.</p> <p><strong>Research limitations/implications:</strong> By necessity, the integrated graphs provide a snapshot of the Internet topology. In future work, repeated measurements and automated data integration could lead to a better understanding of Internet dynamics.</p> <p><strong>Practical implications:</strong> Due to increasing dependency on the Internet as a critical global infrastructure, studying Internet connectivity is more important than ever for both companies and Internet service providers. The data set will be made publically available for network research.</p> <p><strong>Social implications:</strong> Understanding the structure of Internet serves as a fundamental step in improving the robustness, security, and privacy of any online service.</p> <p><strong>Originality/value:</strong> By carefully integrating six different traceroute datasets such as iPlane, CAIDA, Carna, DIMES, RIPE Atlas, and RIPE IPv6L, this paper presents the Internet graphs of a substantially larger and thus solid scale than previously known, at well-established abstraction levels such as the IP interface, router, Point of Presence (PoP), Autonomous System (AS), and Internet Service Provider (ISP). Furthermore, by employing a broad diversity of graph measures, this study creates a more exhaustive snapshot of the global Internet topology than earlier works. </p>
Supplementary Data for "Exploring the Chemical Space of Metal–Organic Frameworks with rht Topology for High Capacity Hydrogen Storage"
<p>This dataset includes optimization and simulation inputs, optimized structures, building blocks, computed hydrogen uptakes and textural properties of the metal–organic frameworks that correspond with work in "Exploring the Chemical Space of Metal–Organic Frameworks with rht Topology for High Capacity Hydrogen Storage" (DOI: 10.1021/acs.jpcc.4c00638).</p>
Model generated open-closed field topology maps produced by ISSI team "Magnetic Open Flux And Solar Wind Structuring Of Interplanetary Space"
<p>Open and closed magnetic field topologies of the solar corona generated using four PFSS based coronal models (EUHFORIA, WSA, MULTI-VP, PSI-PFSS) and one full MHD coronal model (PSSI-MHD) using two different types of HMI-ADAPT magnetic field maps (with and without Active Regions (AR) added retrospectively). The magnetograms used are accessible here <a href="https://doi.org/10.5281/zenodo.10211762" target="_blank" rel="noopener">https://doi.org/10.5281/zenodo.10211762</a> (Henney, Carl. ‘ADAPT Global Solar Magnetic Maps - 2010 Sep 18-20 (w/ & W/o Farside Active Region Input)’. Zenodo, 28 November 2023).</p> <p>These model outputs were generated by the ISSI team "Magnetic Open Flux And Solar Wind Structuring Of Interplanetary Space" and were used for the paper accessible on Arxiv via this link: https://arxiv.org/abs/2311.04024</p>
Deciphering complex networks via topology-encoded latent hyperbolic geometry
<p><span>Complex networks, which are the abstraction of many real-world systems, present a persistent challenge across disciplines for people to decipher their underlying information. Recently, hyperbolic geometry of latent spaces has gained traction in network analysis, due to its ability to preserve certain local intrinsic properties of the nodes. In this study, we explore the problem from a much broader perspective: understanding the impact of nodes' global topological structures on latent space placements. Our investigations reveal a direct correlation between the topological structure of nodes and their positioning within the latent space. Building on this deep and strong connection between node distance and network topology, we propose a novel embedding framework called Topology-encoded Latent Hyperbolic Geometry (TopoLa) for analyzing complex networks. With the encoded topological information in the latent space, TopoLa is capable of enhancing both conventional and low-rank networks, using the singular value gap to clarify the mathematical principles behind this enhancement. Meanwhile, we show that the equipped TopoLa distance can also help augment pivotal deep learning models encompassing knowledge distillation and contrastive learning.</span></p>
EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season
<p>EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season</p>
Machine learning-based pulse wave analysis for classification of circle of Willis topology: an in silico study with 30,618 virtual subjects (database: Complete CoW)
<p>This repository contains the dataset for the complete CoW described in the article with the same name. MATLAB and Python codes for post-processing the dataset and the code for training and testing all machine learning models using the open-source library TensorFlow 2.12, the Keras application programming interface, and the Scikit-learn Python package can be found in here (<a href="https://zenodo.org/records/12519322" target="_blank" rel="noopener">https://zenodo.org/records/12519322</a>).</p>
Observation of topological frequency combs
<p>On-chip generation of optical frequency combs using nonlinear ring resonators has enabled numerous applications of combs that were otherwise limited to mode-locked lasers. Nevertheless, on-chip frequency combs have relied predominantly on single-ring resonators. Here, we experimentally demonstrate the generation of a novel class of frequency combs, the topological frequency combs, in a two-dimensional lattice of hundreds of ring resonators that hosts fabrication-robust topological edge states with linear dispersion. By pumping these edge states, we demonstrate the generation of a nested frequency comb that shows oscillation of multiple edge state resonances across $\approx$40 longitudinal modes and is spatially confined at the lattice edge. Our results provide an opportunity to explore the interplay between topological physics and nonlinear frequency comb generation in a commercially available nanophotonic platform.</p>
Topology testing and demographic modeling illuminate a novel speciation pathway in the Greater Caribbean Sea following the formation of the Isthmus of Panama
<p>Recent genomic analyses have highlighted the prevalence of speciation with gene flow in many taxa and have underscored the importance of accounting for these reticulate evolutionary processes when constructing species trees and generating parameter estimates. This is especially important for deepening our understanding of speciation in the sea where fast-moving ocean currents, expanses of deep water, and periodic episodes of sea level rise and fall act as soft and temporary allopatric barriers that facilitate both divergence and secondary contact. Under these conditions, gene flow is not expected to cease completely while contemporary distributions are expected to differ from historical ones. Here we conduct range-wide sampling for Pederson's cleaner shrimp (<em>Ancylomenes</em> <em>pedersoni</em>), a species complex from the Greater Caribbean that contains three clearly delimited mitochondrial lineages with both allopatric and sympatric distributions. Using mtDNA barcodes and a genomic ddRADseq approach, we combine classic phylogenetic analyses with extensive topology testing and demographic modeling (10 site frequency replicates x 45 evolutionary models x 50 model simulations/replicate = 22,500 simulations) to test species boundaries and reconstruct the evolutionary history of what was expected to be a simple case study. Instead, our results indicate a history of allopatric divergence, secondary contact, introgression, and endemic hybrid speciation that we hypothesize was driven by the final closure of the Isthmus of Panama and the strengthening of the Gulf Stream Current ~3.5 million years ago. The history of this species complex recovered by model-based methods that allow reticulation differs from that recovered by standard phylogenetic analyses and is unexpected given contemporary distributions. The geologically and biologically meaningful insights gained by our model selection analyses illuminate what is likely a novel pathway of species formation not previously documented that resulted from one of the most biogeographically significant events in Earth's history.</p>
Data for "Programmable adiabatic demagnetization for systems with trivial and topological excitations"
<p>We provide the data and scripts used to produce plots shown in our paper "Programmable adiabatic demagnetization for systems with trivial and topological excitations".</p> <p> </p> <p><strong>Abstract</strong></p> <p>We propose a simple, robust protocol to prepare a low-energy state of an arbitrary Hamiltonian on a quantum computer or programmable quantum simulator. The protocol is inspired by the adiabatic demagnetization technique, used to cool solid-state systems to extremely low temperatures. A fraction of the qubits (or spins) is used to model a spin bath that is coupled to the system. By an adiabatic ramp down of a simulated Zeeman field acting on the bath spins, energy and entropy are extracted from the system. The bath spins are then measured and reset to the polarized state, and the process is repeated until convergence to a low-energy steady state is achieved. We demonstrate the protocol via application to the quantum Ising model. We study the protocol's performance in the presence of noise and show how the information from the measurement of the bath spins can be used to monitor the cooling process. The performance of the algorithm depends on the nature of the excitations of the system; systems with non-local (topological) excitations are more difficult to cool than those with local excitations. We explore the possible mitigation of this problem by trapping topological excitations.</p>
Data and code for "Experimental Observation of Topological Quantum Criticality" (matfiles, matlab script, and figures)
<p>Matlab code "zenodo_topological_quantum_criticality.m" generates Figure2 and 3 in the main script, and the Figure 2 and 3 in the Supplemental material. The generated figures are saved under folder 'figure', and the datasets used for the generation are saved under folder 'matfiles'. </p> <p>The raw measurement data (approx. 350 GB) will be shared only upon request. Please contact the Integrated Quantum Optics group (head: C. Silberhorn), Paderborn University.</p> <p>This is additional information of the publication arXiv:2301.05428 "Experimental Observation of Topological Quantum Criticality"</p>
Formal Verification of Storm Topologies through D-VerT
<p>This archive includes the research data associated to the paper:<br> Formal verification of storm topologies through D-VerT. In <em>Proceedings of the Symposium on Applied Computing</em> (SAC '17). Francesco Marconi, Marcello M. Bersani, and Matteo Rossi. 2017. ACM, New York, NY, USA, 1168-1174. DOI: https://doi.org/10.1145/3019612.3019769</p> <p>Specifically it includes the UML models shown in the paper (Figures 7 and 8), the corresponding instances of the Temporal logic models automatically generated by means of the D-VerT and the output files of the experiments.</p>
Quantum Chemical Topology of the Electron Localization Function in the Field of Attosecond Electron Dynamics
<p>Movies accompaning publication of the Article "Quantum Chemical Topology of the Electron Localization Function in the Field of Attosecond Electron Dynamics". Journal of Physical Chemistry Letters, ACS, DOI:10.1021/acs.jpclett.7b03379</p> <p><strong>Collision of water molecule by alpha particle. Time-Dependent Density Functional Theory simulations.</strong></p> <p><strong>Water molecule</strong></p> <p>- Collision of gas phase H<sub>2</sub>O with 100 MeV alpha particle. ELF isosurface of 0.88.</p> <p>Full duration of movie: 5fs. 1E2MeV_H2O_view1.mpeg</p> <p>- Collision of gas phase H<sub>2</sub>O with 1 MeV alpha particle. ELF isosurface of 0.88.</p> <p>Full duration of movie: 5fs. 1E0MeV_H2O_view1.mpeg</p> <p> </p> <p>- Collision of gas phase H<sub>2</sub>O with 0.1 MeV alpha particle. ELF isosurface of 0.70.</p> <p>Full duration of movie: 5fs. 1E-1MeV_H2O_view1.mpeg</p> <p>- Collision of gas phase H<sub>2</sub>O with 0.05 MeV alpha particle. ELF isosurface of 0.8.</p> <p>Full duration of movie: 5fs. 5E-2MeV_H2O_view1.mpeg</p> <p>- Collision of gas phase H<sub>2</sub>O with 0.01 MeV alpha particle. ELF isosurface of 0.8.</p> <p>Full duration of movie: 5fs. 1E-2MeV_H2O_view1.mpeg</p> <p><strong>Movies - guanine </strong></p> <p>Color code: Carbon in green, oxygen in red, nitrogen in blue, hydrogen and alpha particle in white. The ELF attractor are shown in yellow.</p> <p> </p> <p>- Collision of gas phase guanine with 1 MeV alpha particle. ELF isosurface of 0.8. Case i) the alpha particle impacts the central C=C bond. Full duration of movie: 430as. </p> <p>gua_1MeV_C=C_view1.mpeg, gua_1MeV_C=C_view2.mpeg</p> <p>- Collision of gas phase guanine with 1 MeV alpha particle. ELF isosurface of 0.8. Case ii) the alpha particle impact the 6-member ring N atom. Full duration of movie: 430as. </p> <p>gua_1MeV_6RN_view1.mpeg, gua_1MeV_6RN_view2.mpeg</p> <p>- Collision of gas phase guanine with 0.1 MeV alpha particle. ELF isosurface of 0.8. Case i) the alpha particle impacts the central C=C bond. Full duration of movie: 1.5fs. </p> <p>gua_01MeV_C=C_view1.mpeg, gua_01MeV_C=C_view2.mpeg</p> <p>- Collision of gas phase guanine with 0.1 MeV alpha particle. ELF isosurface of 0.8. Case ii) the alpha particle impact the 6-member ring N atom. Full duration of movie: 1.5fs. </p> <p>gua_01MeV_6RN_view1.mpeg, gua_01MeV_6RN_view2.mpeg</p>
ScienceDex guides
Understand access before you commit
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.