A Photoelectric Technique for Measuring Lightning-Channel Propagation Velocities from a Mobile Laboratory

AbstractWe have proposed elsewhere a photoelectric technique for narrow field astrometry which is potentially far more accurate than photography. In this paper the atmospheric limitations, particularly those arising from anomalous refraction are studied. The conclusion is that considerable improvements are indeed feasible from the ground.

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Computation of Energy Absorption and Residual Voltage in a Fourth Rail LRT Station Arresters in EMTP-RV: A Comparative Study

Urban Rail Transit ◽

10.1007/s40864-021-00143-w ◽

2021 ◽

Author(s):

Farah Asyikin Abd Rahman ◽

Mohd Zainal Abidin Ab Kadir ◽

Ungku Anisa Ungku Amirulddin ◽

Miszaina Osman

Keyword(s):

Electromagnetic Transients ◽

Lightning Strike ◽

Voltage Gradient ◽

Urban Transit ◽

Residual Voltage ◽

Voltage Ratio ◽

Lightning Channel ◽

Breakdown Region ◽

Current Region ◽

Performance Results

AbstractThis paper presents a study on the performance of a fourth rail direct current (DC) urban transit affected by an indirect lightning strike. The indirect lightning strike was replicated and represented by a lightning-induced overvoltage by means of the Rusck model, with the sum of two Heidler functions as its lightning channel base current input, on a perfect conducting ground. This study aims to determine whether an indirect lightning strike has any influence with regard to the performance of the LRT Kelana Jaya line, a fourth rail DC urban transit station arrester. The simulations were carried out using the Electromagnetic Transients Program–Restructured Version (EMTP–RV), which includes the comparison performance results between the 3EB4-010 arrester and PDTA09 arrester when induced by a 90 kA (9/200 µs). The results demonstrated that the PDTA09 arrester showed better coordination with the insulated rail bracket of the fourth rail. It allowed a lower residual voltage and a more dynamic response, eventually resulting in better voltage gradient in the pre-breakdown region and decreased residual voltage ratio in the high current region.

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Molecular Diagnostics of Ebola Patient Samples by Institut Pasteur de Dakar Mobile Laboratory in Guinea 2014–2016

Emerging Challenges in Filovirus Infections ◽

10.5772/intechopen.88263 ◽

2020 ◽

Author(s):

Oumar Faye ◽

Cheikh Tidiane Diagne ◽

Amadou Diallo ◽

Emily Meyer ◽

Barre Soropogui ◽

...

Keyword(s):

Molecular Diagnostics ◽

Mobile Laboratory

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An Automated Mobile Laboratory for Continuous Monitoring of Atmospheric Pollutants

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1980_194_042_02 ◽

1980 ◽

Vol 194 (1) ◽

pp. 357-364

Author(s):

R. M. Harrison ◽

H. A. McCartney

Keyword(s):

Continuous Monitoring ◽

Air Pollutant ◽

Atmospheric Pollutants ◽

Gaseous Pollutants ◽

Mobile Laboratory ◽

Digital Form ◽

Pollutant Concentrations ◽

Particulate Pollutants ◽

Nitrate Fertilizer ◽

Wet Chemical

The construction and operation of an automated mobile laboratory for continuous air pollutant monitoring are described. The gaseous pollutants sulphur dioxide, nitric oxide, nitrogen dioxide and ozone are monitored continuously, whilst particulate pollutants are collected for subsequent wet chemical analysis. Gaseous pollutant concentrations together with measurements of wind direction and speed and solar radiation are recorded continuously in both analogue and digital form. The problems inherent in siting and operating the mobile laboratory are discussed and the analysis of monitoring data is illustrated with reference to a recent survey carried out in the vicinity of an ammonium nitrate fertilizer works.

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