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13 results for “vhf”
Quantification of Electric Fields in Fast Breakdown during Lightning Initiation from VHF-UHF Power Spectra
<p>The data support the manuscript entitled “Quantification of Electric Fields in Fast Breakdown during Lightning Initiation from VHF-UHF Power Spectra” that is submitted to GRL. These files can be opened by MATLAB. The data can be used freely for scientific purposes with appropriate citation.</p>
American Beaver: GPS and VHF tag data from resident and translocated beavers on the Price and San Rafael Rivers, Utah
<p>Wildlife translocations can dramatically alter animal movement behavior. Thus, identifying common movement patterns post-translocation can aid in setting expectations and anticipating animal behavior in subsequent efforts. American and Eurasian beavers (Castor canadensis; C. fiber) are frequently translocated for reintroduction efforts, to mitigate human-wildlife conflict, and for use as an ecosystem restoration tool. However, little is known about movement behavior of translocated beavers post-release, especially in desert rivers where resources are patchy and dynamic. We identified space-use patterns to develop an expectation framework of beaver movement behavior for future beaver-assisted restoration efforts. We captured, tagged, translocated, and monitored 41 nuisance American beavers in desert river restoration sites on the Price and San Rafael Rivers, Utah, USA, and compared their space use to 16 resident beavers. We tracked beavers 2-7 times per week from May through October in 2019 and 2020 via GPS locations and radio-telemetry, and from May 2019 through March 2021 via passive integrated antennae installed in the rivers. Resident adult beavers were detected at a mean maximum distance of 0.86 ± 0.21 river kilometers (km; ±1 SE), while resident subadult (11.00 ± 4.24 km), translocated adult (19.69 ± 3.76 km), and translocated subadult (21.09 ± 5.54 km) beavers were detected at substantially greater maximum distances. Based on coarse-scale movement models, translocated and resident subadult beavers moved substantially farther from release sites and faster than resident adult beavers up to six months post-release. In contrast, based on fine-scale, short-term movement models over 5-minute intervals, we observed similar median distance traveled between resident adult and translocated beavers. Our findings suggest day-to-day activities such as foraging and resting were largely unaltered by translocation, but translocated beavers exhibited coarse-scale movement behavior most similar to dispersal by resident subadults. Coarse-scale movement rates decreased with time since release, suggesting that translocated beavers adjusted to the novel environment over time and eventually settled into a home range similar to resident adult beavers. This is the first study comparing resident and translocated beaver movement behavior in the same system. Understanding translocated beaver movement behavior in response to a novel desert system can help future beaver-assisted restoration efforts to identify appropriate release sites and strategies.</p>
Fine Three-Dimensional VHF Lightning Mapping Using Waveform Cross-Correlation TOA Method
<p>In a manuscript entitled “Fine Three-Dimensional VHF Lightning Mapping Using Waveform Cross-Correlation TOA Method”, the lightning data obtained by an improved VHF 3-D location system were analyzed. The data supports the aforementioned manuscript and can be used freely for scientific purposes with appropriate citation.</p>
American Beaver: GPS and VHF tag data from resident and translocated beavers on the Price and San Rafael Rivers, Utah
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Locating large insects using automated VHF radio telemetry with a multi-antennae array
<p>1. We describe an automated radio telemetry system (ARTS) designed for estimating the location of 0.50g butterflies that was constructed with commercially available materials. Previously described systems were not designed to estimate fine-scale locations of large insects within approximately 200m$^2$ study areas.</p> <p>2. The ARTS consists of four receiving stations. Each receiving station has four 3-element, directional Yagi antennae (separated by 60\si{\degree}) connected to an automated receiver that records detected power sequentially from each antenna. To develop and evaluate the ARTS performance, four receiving stations were installed in the corners of 4-ha and 6.25-ha square fields with varying heights of vegetative cover. The location of a 0.22g transmitter was estimated with a statistical method implementing both distance- and angle-power relationships. Calibrated model parameters were based on power detected from transmitters at known locations. Using independently collected data, model performance was evaluated based on estimated locations of a georeferenced stationary transmitter, a moving transmitter with a known georeferenced path, and a transmitter attached to a monarch butterfly (\textit{Danaus plexippus}). Estimated locations were calculated as frequently as every 5 seconds, which is at least 12 times greater than the sampling frequency previously reported for tracking insects.</p> <p>3. When sufficient power data was received, the median estimated locations of a transmitter attached to an investigator's hat were $<$16m from the true location. The median effective radius of the 95\% confidence ellipse was 18.3m for stationary targets and 15.9m for a moving transmitter. Greater error in location estimation was expected when the transmitter was attached to a monarch butterfly due to interference from vegetation and variability in antenna orientation and transmitter height. As such, the median distance between the estimated and true locations was 72m. After applying a correction for the effect of vegetation, median location error was reduced by 12m.</p> <p>4. While our ARTS has likely reached the limit of current technology, the system is still a substantial methodological advancement for locating butterflies. Our efforts should provide a benchmark as technology improves.</p>
Polarimetric Radar Signatures of Lightning Initiation Processes Imaged with VHF Broadband Interferometer
<p>This spreadsheet contains the details of the lightning events analyzed in this study, including the date, time, INTF mapping information, NLDN-reported information, and the positions and location errors referred from the combined analysis of the INTF and NLDN reports. </p> <p> </p>
The study of daytime ionospheric E-region radar echoes simultaneously observed by Qujing VHF radar and multi-ionosondes
<p>Qujing VHF coherent backscatter radar observed from 05:00 - 08:00 UT (13:00-16:00 LT) on 20 June, 2020;</p> <p>Ionosonde data observed on 19, 20, and 21 June 2020 at Huize and Qujing;</p> <p>Fengyun-4A (FY-4A) satellite data observed from 0230 UT to 0730 UT on 20 June, 2020.</p>
Needles and Lightning Leader Dynamics Imaged with 100–200 MHz Broadband VHF Interferometry
<p>The data supports the manuscript entitled “Needles and Lightning Leader Dynamics Imaged with 100–200 MHz Broadband VHF Interferometry” that is submitted to GRL. These files can be opened by MATLAB. The data can be used freely for scientific purposes with appropriate citation.</p>
Searching for intra-cloud positive leaders in VHF
<p>The data needed for making the figures for the paper that will be submitted for publication in GRL, including the GLE-scipts for making the figures.</p>
Inferring neutral winds in the ionospheric transition region from AGW-TID observations with the EISCAT VHF radar and the Nordic Meteor Radar Cluster
<p>[Dataset] Inferring neutral winds in the ionospheric transition region from AGW-TID observations with the EISCAT VHF radar and the Nordic Meteor Radar Cluster</p>
Repeatability and Reproducibility of the ArcScan Insight 100 VHF Digital Ultrasound
ClinicalTrials.gov study NCT02519985. IPD Sharing: Not stated. Countries: 1. Publications: 5.
Locating large insects using automated VHF radio telemetry with a multi-antennae array
Open the record for dataset details and reuse information.
[Dataset and Software] Altitude-dependent plasma parameter variations of synthetic EISCAT UHF and VHF incoherent scatter spectra calculated from TIE-GCM results
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DANDI Archive for NWB datasets
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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.