Automatic lightning location system

Hyperbolic triangulation method was used for locating lightning storm path and position from VHF lightning charge emissions. Possible applications in electric power companies, forest fire lookout centers, airports, and pipeline companies are indicated

Combining WASP and Kepler data: the case of the Sct star KIC 7106205

Ground-based photometric observations from Wide Angle Search for Planets (WASP) have been calibrated, scaled and combined with Kepler observations of the δ Sct star KIC 7106205, allowing us to extend the time base of the study of the unexplained amplitude and frequency variation of a single pressure mode at ν = 13.3942 d−1 by 2 yr. Analysis of the combined data sets, spanning 6 yr, show that the amplitude modulation in KIC 7106205 has a much larger range than a previous study of the Kepler data alone indicated. The single pressure mode decreased from 11.70 ± 0.05 mmag in 2007, to 5.87 ± 0.03 mmag in 2009, and to 0.58 ± 0.06 mmag in 2013. Observations of the decrease in mode amplitude have now been extended back 2 yr before the launch of Kepler. With observations over a longer time span, we have been able to further investigate the decrease in mode amplitude in KIC 7106205 to address the question of mode amplitude stability in δ Sct stars. This study highlights the usefulness of the WASP data set for extending studies of some Kepler variable stars

Comparisons of full correlation analysis (FCA) and imaging Doppler interferometry (IDI) winds using the Buckland Park MF radar

© European Geosciences Union 2004We present results from three years of mesospheric and thermospheric wind measurements obtained using full correlation analysis (FCA) and imaging Doppler interferometry (IDI) for the Buckland Park MF radar. The IDI winds show excellent agreement with the FCA winds, both for short (2-min) and longer term (hourly, fortnightly) comparisons. An extension to a commonly used statistical analysis technique is introduced to show that the IDI winds are approximately 10% larger than the FCA winds, which we attribute to an underestimation of the FCA winds rather than an indication that IDI overestimates the wind velocity. Although the distribution of IDI effective scattering positions are shown to be consistent with volume scatter predictions, the velocity comparisons contradict volume scatter predictions that the IDI velocity will be overestimated. However, reanalysis of a 14-day data set suggests the lack of overestimation is due to the radial velocity threshold used in the analysis, and that removal of this threshold produces the volume scatter predicted overestimation of the IDI velocities. The merits of using hourly IDI estimates versus hourly averaged 2-min IDI estimates are presented, suggesting that hourly estimated turbulent velocities are overestimated.D. A. Holdsworth and I. M. Rei

The Buckland Park MF radar: routine observation scheme and velocity comparisons

This paper describes the routine observations scheme implemented for the Buckland Park medium frequency (BPMF) radar. These observations are rare among current MF/HF radar observations in that they are made using a relatively narrow transmit polar diagram. The flexibility of the radar allows a number of analyses to be performed simultaneously. The analyses described include the full correlation analysis (FCA), spatial correlation analysis (SCA), hybrid Doppler interferometry (HDI) and imaging Doppler interferometry (IDI) for observations of mesospheric dynamics and the temporal and spatial characteristics of their scatterers, the differential absorption experiment (DAE) for the estimation of electron densities and collision frequencies, and meteor analysis for estimation of meteor height, time and angle of arrival (AOA) distributions. Intercomparisons between wind velocities estimated using the FCA with SCA, HDI and IDI techniques are presented. The FCA velocities exhibit the well-known "triangle size effect" (TSE), whereby the wind velocity is underestimated at smaller antenna spacings. Although the SCA, IDI and HDI techniques were not applied concurrently, comparisons using FCA as a reference suggest these techniques produce velocities in good agreement.D. A. Holdsworth and I. M. Rei

Employment Law

Against the backdrop of a year that saw the COVID-19 pandemic alter the American workplace in an unprecedented way, the employment law landscape in Virginia also underwent a recent sea change. Historically considered an employer-friendly state, the General Assembly shifted away from tradition by enacting several significant pieces of employee-friendly legislation, which will surely have a long-lasting impact on Virginia employees, businesses, and Virginia’s economy at large. This Article highlights these critical developments in Virginia employment law. It does not provide an in-depth analysis of every development but highlights the most significant changes affecting employers and employees in the Commonwealth. Part I of this Article provides a brief overview of the added employee protections from the federal legislation passed pursuant to the COVID-19 pandemic and discusses Virginia’s efforts in creating the nation’s first COVID-19 workplace safety mandate. Part II briefly highlights legislation enacted in 2019, which set the stage for the General Assembly’s activism in 2020, and then discusses in detail Virginia’s new employment laws. Part III then addresses two recent landmark employment law decisions from the Supreme Court of the United States of which employees and employers alike should be aware

America\u27s (Not So) Golden Door: Advocating for Awarding Full Workplace Injury Recovery to Undocumented Workers

This comment argues that awarding full damages to illegal immigrants who suffer workplace injuries better serves the United States\u27 federal immigration objectives

Analyzing the Virginia Workers\u27 Compensation Act\u27s Governance of Employer Non-Compliance

This essay attempts to resolve the current disconnect in the state judiciary‘s application of section 65.2-805(A) by analyzing the language of the statute as well as the various policy implications that undergird its establishment and accompany each interpretation. Part I provides a brief background of workers‘ compensation law generally, the Virginia Workers‘ Compensation Act (including section 65.2-805(A)), and the relevant case law involving section 65.2-805(A). Part II proceeds with the essay‘s argument, i.e., that section 65.2-805(A) should not be interpreted as imposing strict liability on non-compliant employers and thereby eliminating the obligation for a plaintiff-employee to plead a prima facie case of negligence. To the extent that this interpretation differs from the original intent of the General Assembly when it enacted section 65.2-805(A), or the current intent of the General Assembly for that matter, Part III invites the legislature to make an appropriate amendment through traditional means