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198 results for “Leader”
Data supporting On the step type of continuous propagating positive leader in laboratory-scale long spark discharges
<p>The data supports the manuscript entitled "On the step type of continuous propagating positive leader in laboratory-scale long spark discharges". The *.txt file contains the applied voltage waveform and discharge current waveform. The*.doc file contains the data for Figure 5. The *.rar file contains the high-speed video frames, and can be decompressed and opened. The data can be used freely for scientific purposes with appropriate citation.</p>
Supplementary data for "Upward leaders from instrumented lightning rods competing to connect a downward leader during a lightning attachment process"
<p>High-speed videos of the lightning attachment to lightning rods observed by the Vision Reserch Phantom V12 and V711 cameras. See Instructions file to play the videos.</p>
Initiation of downward positive leader beneath the negative leader channel
<p>The data supports the manuscript entitled "Initiation of downward positive leader beneath the negative leader channel" and MATLAB can open these *.fig and *.mat files.</p> <p>MATLAB Code ReadTdms.m can open these *.tdms. The data of *.cine can be opened by Phantom Camera Control software that can be download from this link: </p> <p>https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware </p> <p>The data can be used freely for scientific purposes with the appropriate citation. </p>
Visualizations of the leader channel parameters evolution at the stage of recoil leader initiation
<p><span>This repository presents figures visualizing the leader channel parameters evolution at the stage of recoil leader initiation along with their textual description.</span></p>
Properties of negative initial leaders and lightning flash size in a cluster of supercells
<p>It is the figure data of the paper titled as "Properties of negative initial leaders and lightning flash size in a cluster of supercells". The abstract of this paper is as follows:</p> <p>Properties of negative initial leaders (NILs) and flash size in a cluster of supercells with generally inverted charge structure in Oklahoma on 10 − 11 May 2010 are examined, primarily using Lightning Mapping Array data. A method to identify NILs from LMA source is proposed, and helps to reveal the multiple NILs properties and their distributions. The NILs in the supercell cluster have smaller speed (median 3D displacement speed: 0.65 × 10<sup>5</sup> m s<sup>−1</sup>), relative to the previous reports in “normal” thunderstorms. Furthermore, median NIL speeds initially decrease with increasing height, but begin increasing above 12 km. The NILs tend to decelerate during the early stage. The parameters characterizing flash duration and spatial size are also investigated. It is found they all follow lognormal distributions and the spatial flash size is relatively small on average (median horizontal distance: 5.54 km). Most flashes (83.18%) extend primarily in the horizontal direction. Flash area shows an inverse relationship with flash density at their fast changes during storm evolution. Although large flash initiation density (FID) generally occurs in regions with small flash size, the smallest flash size is nearly not collocated with large FID value. In the regions with large FID, average flash duration roughly increases with increasing FID, while average flash area changes little. We proposed that the pattern of charge pockets and variation of charge density dominated by the strong kinematics are responsible for some new findings about the properties of NIL and flash size in the supercell cluster.</p>
Initial leader properties during the preliminary breakdown processes of lightning flashes and their associations with initiation positions
<p>It is the dataset assocaited with the figures in the paper titled "Initial leader properties during the preliminary breakdown processes of lightning flashes and their associations with initiation positions" which was submitted to the Journal of Geophysical Research: Atmospheres for publication. It can be accessed using Matlab. The abstract of the manuscript is as follows.</p> <p>The properties of initial leaders (ILs) of 1056 flashes in two thunderstorms in Guangzhou, China, are analyzed. The median values of IL properties are 11.1 ms for duration, 2.2 km for vertical distance, 2.7 km for 3-D distance, 1.9 × 10<sup>5</sup> m s<sup>−1</sup> for vertical speed, 2.4 × 10<sup>5</sup> m s<sup>−1</sup> for 3-D speed, 28° for angle between the IL’s displacement direction and the vertical direction, 1.1 per ms for pulse rate, 179 m for vertical step length and 224 m for 3-D step length. All the IL properties follow lognormal distributions. Strong monotonic relationships of IL duration with speed and pulse rate and pulse rate with speed and step length are revealed. With increasing initiation altitude, IL duration and step length tend to increase, and IL speed and pulse rate tend to decrease. The ILs initiated at approximately the −20 ℃ isotherm are more vertically orientated on average than those initiated at lower or higher levels. The ILs initiated in the strong kinematic areas generally had a greater speed and pulse rate but smaller duration, distance and step length relative to those initiated in the weak kinematic areas. The possible impacts of the charge distribution patterns and density on the IL properties in different types of thunderstorms or thunderstorm areas are discussed.</p>
Joint distribution between rankings (leader and metric based) and metric values
<p>These images represent the joint distribution between productivity metric values and rankings based on these productivity metrics and the development team leader's information.</p>
High-speed videos for the paper "The role of secondary recoil leaders in the formation of subsequent return strokes"
<p>This page contains high-speed video files as .cine files, that can be watched frame by frame to reproduce the analysis done in the paper titled "The role of secondary recoil leaders in the formation of subsequent return strokes", submitted for publication in Geophysical Research Letters.</p> <p><em>Instructions to watch the videos</em>: <strong>UP 44.cine </strong>and<strong> UP 154.cine:</strong></p> <p>Download and use the software Phantom Camera Control (PCC) available at:</p> <p><a href="https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware">https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware</a></p> <p>The Phantom Camera Control (PCC) software is compatible with Windows 7 Pro and Windows 8.1 and Windows 10, for both 32 and 64-bit operating systems.</p> <p>It is important to highlight that the time stamped on the video of the <strong>UP 44.cine</strong> is 97 ms delayed compared to the Earth Networks Total Lightning Network (ENTLN).</p>
High-speed videos for the paper "Correlation between speed of the stepped leader and peak current of the return stroke of lightning flashes"
<p>This page contains one spreadsheets with the data of the analyzed lightning flashes (.xlsx file). And it also has high-speed camera video files (.cine files) that are located inside the Lighning Flashes.rar folder. The videos can be watched frame by frame to reproduce the analysis done in the paper titled "Correlation between speed of the stepped leader and peak current of the return stroke of lightning flashes", submitted for publication in Geophysical Research Letters.</p> <p>Instructions to watch the videos: </p> <p>Download and use the software Phantom Camera Control (PCC) available at:</p> <p>https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware</p> <p>The Phantom Camera Control (PCC) software is compatible with Windows 7 Pro and Windows 8.1 and Windows 10, for both 32 and 64-bit operating systems.</p>
High-speed videos for the paper "Upward bipolar lightning flashes originated from the connection of recoil leaders with intracloud lightning"
<p>This page contains high-speed video files as .cine files, that can be watched frame by frame to reproduce the analysis done in the paper titled "Upward bipolar lightning flashes originated from the connection of recoil leaders with intracloud lightning", submitted for publication in Geophysical Research Letters.</p> <p><em>Instructions to watch the videos</em>: <strong>UP 44.cine </strong>and<strong> UP 76.cine:</strong></p> <p>Download and use the software Phantom Camera Control (PCC) available at:</p> <p><a href="https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware">https://www.phantomhighspeed.com/resourcesandsupport/phantomresources/pccsoftware</a></p> <p>The Phantom Camera Control (PCC) software is compatible with Windows 7 Pro and Windows 8.1 and Windows 10, for both 32 and 64-bit operating systems.</p>
Do Team Trust and Leader Support Matter at Work and Beyond?
<p>Team effectiveness is examined using the Arc of Purposeful Leadership model to investigate mediational effects of employees’ departmental impact, organizational commitment, and leader support on work-family synergy and emotional exhaustion. Structural equation modelling and Hayes’ PROCESS macro were used to analyze the responses of 319 participants. Findings support the Input-Process-Output (IPO) model of team effectiveness. Relationships between team purpose/support and outcome variables (work-family synergy and emotional exhaustion) were mediated by employees’ departmental impact, organizational commitment, and leader support. Findings reveal the complexities of team processes in relation to outcomes, including work-family synergy and emotional exhaustion, that extend beyond the workplace.</p> <p>Data were collected at University of Redlands in 2020 during the COVID-19 pandemic.</p>
Mathematical model results for: Dynamic fibronectin assembly and remodeling by leader neural crest cells prevents jamming in collective cell migration
<p>Collective cell migration plays an essential role in vertebrate development, yet the extent to which dynamically changing microenvironments influence this phenomenon remains unclear. Observations of the distribution of the extracellular matrix (ECM) component fibronectin during the migration of loosely connected neural crest cells (NCCs) lead us to hypothesize that NCC remodeling of an initially punctate ECM creates a scaffold for trailing cells, enabling them to form robust and coherent stream patterns. We evaluate this idea in a theoretical setting by developing an agent-based model that incorporates reciprocal interactions between NCCs and their ECM. ECM remodeling, haptotaxis, contact guidance, and cell-cell repulsion are sufficient for cells to establish streams in silico, however additional mechanisms, such as chemotaxis, are required to consistently guide cells along the correct target corridor. Further investigations of the model imply that contact guidance and differential cell-cell repulsion between leader and follower cells are key contributors to robust collective cell migration by preventing stream breakage. Global sensitivity analysis and simulated underexpression/overexpression experiments suggest that long-distance migration without jamming is most likely to occur when leading cells specialize in creating ECM fibers, and trailing cells specialize in responding to environmental cues by upregulating mechanisms such as contact guidance. This dataset contains summary statistics, movies, parameter values, and photos obtained from individual realizations of the mathematical model.</p>
Visualization of electric field distribution inside streamer zones of positive and negative lightning leaders
<p>This online storage contains numerous 3D visualizations of streamer coronas of positive and negative lightning leaders (figures named “3D”) along with 2D distributions of electric field inside and at the close vicinity of their streamer zones (figures named “2D”).</p> <p>In 3D figures yellow links are streamer channels growing from the leader tip (short red link). Solid red areas denote the volumes inside which electric field amplitude exceeds the air breakdown threshold amounting 2.9 MV/m at the considered altitude of 1 km above the mean sea level. Values in legends of each panel are (from left to right) percentage of horizontal links, streamer zone fractal dimension, leader channel sheath line charge density, and the maximal value of local electric field.</p> <p>2D figures present electric field distributions inside and at the close vicinity of streamer zones of positive and negative lightning leaders in x-z and y-z planes for the cases presented in Figs. “3D”. Upper panels visualize vector fields superimposed on equipotential lines. Bottom panels show electric field amplitudes. Dotted lines denote streamer corona borders in corresponding planes.</p> <p>In model realizations the vast majority of streamer zones of positive leaders does not have the areas with electric field exceeding the dielectric strength of air. However, only “successful” cases, in which the amplitudes of local electric field amplifications were bigger than 2.9 MV/m, are shown here.</p>
High-speed video observations of needles evolving into negative leaders in a positive cloud-to-ground lightning flash
<p>The data supports the manuscript entitled “<strong>High-speed video observations of needles evolving into negative leaders in a positive cloud-to-ground lightning flash</strong>”. The high-speed video data files of the positive cloud-to-ground lightning (20200603_082539, denoted F20065) of *.cihx and *.avi can be opened by Photron Camera Control software (Photron Fastcam Viewer) that can be download from this link: https://photron.com/photron-support/</p> <p>In addition, MATLAB can open the *.mat file (electric field change data), and Microsoft Excel can open the *.xlsx file (Guangdong-Hong Kong-Macao Lightning Location data (20200603082523-20200603082556).</p> <p>The data can be used freely for scientific purposes with the appropriate citation.</p>
The Scleroderma Patient-centered Intervention Network (SPIN) Support Group Leader Education Program Feasibility Trial
ClinicalTrials.gov study NCT03508661. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Parent Key Opinion Leaders to Increase Demand of Effective Treatments for Youth Anxiety
ClinicalTrials.gov study NCT04929262. IPD Sharing: NO. Countries: 1. Publications: 1.
A Study of Activity Leader to Forest Therapy Campaign in Different Environments Targets on the Participants Which Had Been Infected by SARS-COV-2
ClinicalTrials.gov study NCT06601920. IPD Sharing: UNDECIDED. Countries: 1. Publications: 11.
Emotional Intelligence Skills Health Leaders Need During Covid-19
ClinicalTrials.gov study NCT04694014. IPD Sharing: YES. Countries: 1. Publications: 5.
Utilizing Palliative Leaders In Facilities to Transform Care for Alzheimer's Disease
ClinicalTrials.gov study NCT04520698. IPD Sharing: YES. Countries: 1. Publications: 3.
GLOBAL LEADERS: A Clinical Study Comparing Two Forms of Anti-platelet Therapy After Stent Implantation
ClinicalTrials.gov study NCT01813435. IPD Sharing: UNDECIDED. Countries: 18. Publications: 20.
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OpenNeuro
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